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Introduction
Mariana H. Staia is Professor at Escuela de Ingeniería Metalúrgica, Central University of Venezuela. Mariana does research in Materials Engineering, Mechanical Engineering and Chemical Engineering. Her current project is on 'Tribology and corrosion of coatings and bulk materials'.
Current institution
Additional affiliations
October 2011 - August 2012
Education
September 1978 - March 1983
Publications
Publications (190)
Electroless nickel-boron coatings present outstanding properties such as high hardness, excellent wear resistance and uniform coating, and thus they are considered to be alternative to toxic hard chrome coatings. However, they contain lead that is toxic and used as stabilizer in the plating bath. This study aims to investigate the tribocorrosion be...
WC-12Co HVOF-sprayed coatings (~400 µm in thickness) reinforced with multiwalled carbon nanotubes (MWCNTs), were deposited on a steel substrate. The aim of this work is to provide and analyze data from HVOF WC-12Co sprayed coatings, concerning the influence of the addition of MWCNTs on their tribocorrosion performance, in a 3.5% NaCl electrolyte. E...
Electroless nickel-boron coatings were deposited from a novel deposition bath that was stabilizer-free. Those coatings were analyzed by DSC to determine the crystallization temperature of nickel-boride phases, and then the best heat treatment conditions for the new coatings were selected using the Knoop hardness test and XRD. The results of DSC ana...
Conventional electroless nickel–boron deposits are produced using solutions that contain lead or thallium, which must be eliminated due to their toxicity. In this research, electroless nickel–boron deposits were produced in a stabilizer-free bath that does not include any toxic heavy metal. During processing, the plating rate increased from 10 to 1...
In the present work, a Si/Zr based sol–gel (SG) coating was deposited on 316L stainless steel plates, previously treated by passivation (SSO) or electropolishing (SSEP) producing two different surface states. The SG coatings were compared for SSO and SSEP substrates in terms of morphology, topography and tribocorrosion response. The coating topogra...
This investigation addresses the effect provided by industrial surface finishes on the tribocorrosion properties of 316L stainless steel exposed to NaCl solution. Three distinct surface treatments were evaluated: passivation (SSO), electropolishing-passivation (SSEP) and micro-undulation (SSM mechano-chemical + electropolishing + passivation). For...
The stress corrosion cracking resistance of two API X65 microalloyed steels, with different microstructures has been evaluated both at room temperature and at 55 °C, by means of Linear Elastic Fracture Mechanics (LEFM) specimens known as MWOL (Modified WOL specimen), under constant displacement. The material with a ferritic–pearlitic microstructure...
Deux revêtements à base nickel obtenus par des bains réducteurs, l’un brut et l’autre ayant subi un traitement thermique sont étudiés. L’essai d’indentation a été mis en œuvre pour caractériser la dureté et le module de Young de ces dépôts. Les résultats montrent une bonne homogénéité des propriétés mécaniques dans l’épaisseur du revêtement, alors...
Resumen
Las propiedades de los recubrimientos a base de circonia estabilizada con ytria (YSZ) confieren a estos un excelente desempeño en una amplia gama de aplicaciones que van desde el uso odontológico hasta barreras térmicas, incluyendo también su empleo como electrolitos sólidos en celdas de combustible. En el presente trabajo, se depositaron r...
Coatings based on WC–12Co, with and without the reinforcement of carbon nanotubes (CNTs) have been deposited by means of the HVOF thermal spraying technique on a SAE 1020 steel substrate. The aim of the present study is to evaluate in detail the influence of the 36 h milling time on both feedstock powders, particularly on the mechanical properties...
The present work has been conducted in order to assess the mechanical and tribological performance of a ZrN/Mo2N coating deposited onto a H13 steel by means of a closed field unbalanced magnetron-sputtering ion-plating process. The hardness and elastic modulus of the coated system have been determined employing nanoindentation techniques. Dry and w...
The results of the mechanical and tribological characterization of a prototype a-C:Cr, Si sputtered coating are presented. The hardness and the elastic modulus of the coated system have been determined by means of nanoindentation taking into account the actual architecture of the bi-layer coating. Both mechanical properties were recorded continuous...
An investigation was conducted in order to determine the effect of both the metallic transfer mode (pulsed arc or short
circuit) and the O2 content in the Ar/O2 gas mixture, of the gas-metal arc welding process (GMAW), on the fatigue life under
uniaxial conditions of welded joints of 316L stainless steel. It was concluded that the mixture of the sh...
Considerable improvement in the tribological response was achieved during sliding wear tests against alumina ball, when AA 2024-T3-aluminium alloy substrate was coated with DLC/NiP duplex coating. Quantitative EPMA analysis carried out on the coated sample cross-section coupled with nanoindentation techniques allowed the identification of the coate...
The evaluation of the elastic response of coated systems under indentation loading represents a crucial issue, which determines the behavior of such systems under tribological applications. Although a number of models have been proposed in the literature for the description of the change in the composite modulus with indentation depth, as well as f...
The change in the composite hardness with penetration depth derived from nanoindentation tests conducted on coated systems, which involve the deposition of multilayer coatings, in general exhibit a complex shape, as a consequence of the sequential contribution of each coating layer to the composite hardness during indentation loading. In spite that...
The present research was carried out with the aim of studying the influence of oxygen concentration during processing on the properties of the VOx coatings deposited by cathodic magnetron sputtering on a stainless steel AISI 316L substrate. Mechanical and tribological properties were measured by nanoindentation and sliding wear tests respectively....
Nanostructured yttria-stabilized zirconia coatings for applications in high-temperature environments can be deposited by suspension plasma spraying (SPS) techniques. The present research has been conducted in order to study the sliding wear response of a SPS ZrO2–8% mol. Y2O3 coating (75 μm in thickness) deposited onto a Haynes 230 substrate, using...
The development of sound constitutive descriptions able to predict accurately the changes in flow stress during plastic deformation, under changing temperature and strain rate conditions is of utmost importance for the correct prediction of the mechanical response of metals and alloys, which undergo deformation under hot-working conditions. Therefo...
Duplex treatments consisting of a plasma nitrided layer followed by a PAPVD hard coating have gained attention in recent years. The aim of this work was to determine the corrosion resistance of AISI H13 steel treated by using this duplex treatment. The samples were pre-nitrided using experimental equipment and, subsequently, TiAlN coating was depos...
This paper presents the friction and wear behaviour of TiB2–40vol%B4C ceramic composite disc in rotating sliding contact against SiC-ball and examines how the tribological characteristics of this system are affected by the interaction of wear particles, loading conditions and sliding speed. The transition from mild to severe wear is analytically mo...
Instrumented indentation tests have been conducted on the surface and cross-section of the two WC based coatings obtained by means of high velocity oxygen fuel thermal spray techniques in order to investigate their mechanical properties. The yield strength of the coatings has been determined by means of the Zeng and Chiu model. In addition, the abs...
In nanoindentation, especially at very low indenter displacements, the indenter/material contact area must be defined in the best possible way in order to accurately determine the mechanical properties of the material. One of the best methodologies for the computation of the contact area has been proposed by Oliver and Pharr [W.C. Oliver, G.M. Phar...
Rotating sliding wear experiments on TiB2-B4C have been conducted at room temperature (25 °C) in dry conditions according to the ASTMG99-95a standard. SiC balls were used as static counterpart. The disk specimens were surface finished by polishing. The tests were performed using different rotating sliding speeds from 0.1 up to 1.5 m/s with a mean H...
The computation of loads, torques and power consumption of hot rolling processes conducted at industrial scale requires a detailed analysis of the work-hardening rate of the material, as well as a precise description of the changes in flow stress with microstructure and deformation conditions. The present work describes two rational experimental me...
This paper reports the friction and wear response of WC-10%Co(Cr/V) cemented carbide with different surface finishes, attained by grinding (G) and wire-EDM, respectively, during sliding experiments at 400 C. For comparison, tests under the same conditions were carried out at 25 C. The wear experiments were performed under a normal force of 14 N, wh...
The authors wish to thank the participating communities, the Laboratory of
Mechanics surfaces and materials processing, University Lille for the access and 84
usage of its research facility. Present research is financially sponsored by Found
for Scientific Research of the Flemish Community (FWO) and the Ghent
University Research Board.
For describing the indentation size effect (ISE), numerous models, which relate the load or hardness to the indent dimensions, have been proposed. Unfortunately, it is still difficult to associate the different parameters involved in such relationships with physical or mechanical properties of the material. This is an unsolved problem since the ISE...
Instrumented indentation is very useful to determine the elastic modulus and hardness of materials. To obtain reliable values of the mechanical properties, the measurement of the indenter displacement into the material must be very precise. In practice, the frame compliance of the instrument and the indenter tip defect are among the most influentia...
The present investigation has been carried out with the aim of determining the tribological behavior of a VPS chromium carbide coating both in the as-deposited and heat-treated conditions. A commercial powder of Cr2C3–25% NiCr was sprayed employing a VPS system (Medicoat AG, Switzerland) onto plain low carbon steel coupons. The samples were subsequ...
Rotating bending fatigue experiments, both in air and in a 3% NaCl solution, have been carried out in order to study the fatigue behavior of a 7075-T6 aluminum alloy coated with a WC–10Co–4Cr cermet by high velocity oxygen fuel (HVOF) thermal spray, without any grit blasting prior to the coating deposition. The results indicate that the presence of...
The fatigue behavior of a SAE 4340 steel, coated with a 50% WC–10Co–4Cr/50% Colmonoy 88 deposit, by high velocity oxygen fuel (HVOF) thermal spray, has been investigated. The change in the maximum alternating stress with the number of cycles to fracture has been described by means of the relationship advanced by Stromeyer. A fractographic analysis...
The present investigation has been conducted in order to evaluate the tribological behavior of an
AA2024-T3 aluminum alloy, coated with a NiP-CrC-DLC coating. The effect of NiP as intermediate layer was
evaluated by carrying out calculations using ELASTICA© in order to determine its adequate thickness needed
to avoid the plastic deformation of the...
This study was conducted with the aim of determining the response to fretting wear of a 7075-T6 aluminum alloy coated with a NiP/ZrN duplex coating. Initially, polished aluminum alloy samples were coated with an electroless NiP coating having 11 wt% P and 30 ± 6 microns in thickness. Subsequently, a ZrN coating of 3 ± 0.3 microns in thickness was d...
The determination of the elastic modulus of thin films by indentation at nano or micrometric scale is possible by applying different models allowing the separation of the substrate influence from the indentation measurement. However, for an accurate determination of the elastic modulus, the indentation depth and/or the contact area must be correcte...
The tensile stress–strain behaviour of AA 7075-T6 aluminium alloy deformed at temperatures in the range of 123–248 K, at strain rates between 0·0023 and 0·21 s−1 has been analysed in order to develop a rational constitutive description of the material under such deformation conditions. The constitutive formulation has been derived on the basis of t...
The present investigation has been carried out in order to study the erosion wear behaviour of WC–Co base thermal spray coatings. WC–12Co and WC–10Co–4Cr coatings were deposited by means of high velocity oxygen fuel (HVOF) thermal spraying. The erosion tests were conducted at impact angles of 30 and 90° using SiC particles of ∼50 μm in diameter as...
Adhesion and hardness of Diamond-Like Carbon films are improved by nitriding of the steel substrate prior to PVD deposition. Since the mechanical properties of the nitrided steel layer are not homogeneous, i.e. a significant hardness decrease is observed in the upper nitrided layer close to the surface, an outer surface layer of ~15μm is removed pr...
A methodology for obtaining a nanocrystalline Al91–Mn6–Nd3 alloy and characterizing its mechanical properties is presented. The fabrication procedure, based on the melt spinning method, allowed the preparation of thin ribbons of ∼30μm in thickness. The hardness and elastic modulus have been determined by classical and instrumented indentation tests...
The present investigation has been conducted in order to develop a constitutive description for a low C-Mn steel employed in structural applications, when this material is deformed under hot-working conditions. The set of equations that encompass the constitutive description of the steel are based on a simplified form of the Mechanical Threshold St...
The present investigation has been conducted in order to develop a rational approach able to describe the changes in flow stress of AA7075-T6 aluminum alloy with deformation temperature and strain rate, when this material is deformed at temperatures in the range of 123–298K at strain rates in the range of 4×10−4 to 5×10−2s−1. The constitutive formu...
The present work has been conducted in order to determine systematically the influence of the spraying distance on the microstructure and mechanical properties of a Colmonoy 88 alloy deposited by means of HVOF thermal spray onto a SAE 1045 steel substrate. The spray distance varied between 380–470mm and the evaluation of the deposits characteristic...
The present work has been conducted in order to determine the influence of the spray distance, on the corrosion-fatigue behavior of a SAE 1045 steel substrate coated with a Ni base coating deposited by high velocity oxygen fuel (HVOF) thermal spray. The spray distances employed in the present investigation were of 380, 425 and 470 mm. The mechanica...
An investigation has been conducted in order to study the fatigue behavior of a SAE 1045 steel substrate coated with a Ni-base alloy known commercially as Colmonoy 88, deposited by HVOF spray technique. Fatigue tests were conducted under axial conditions (R = 0.1), employing samples of the substrate material in the as-polished condition, after grit...
The present study has been carried out to evaluate the corrosion performance of three different (Ti1?xAlx)N/TiN multilayers coatings commercially deposited on WC?Co inserts. Two of these coatings were nanostructured, and all of them presented different Ti/Al atomic ratios varying from 2 : 3 up to 7 : 3 and were deposited by employing a commercial p...
The present investigation has been carried out in order to study the fatigue behavior of a SAE 1045 steel substrate coated with a WC–10Co–4Cr cermet, of approximately 200 μm thick, deposited by HVOF thermal spraying. Particular emphasis has been paid to the influence of the substrate roughness prior to HVOF deposition, as a mean of improving the me...
A methodology for determining the thin film hardness from a microindentation loading curve is proposed. The loading curve is modelled to compute the dynamic Martens hardness using the indentation depth reached during the test. Moreover, the indentation size effect is taken into account by applying the strain gradient plasticity theory. Then, the dy...
The present investigation has been conducted in order to evaluate the change in fatigue properties of a 316L stainless steel substrate when this material is coated with a hydrogenated, amorphous carbon (a-C:H) solid lubricant of approximately 2 μm in thickness, which has been developed in recent years and is known commercially as Dymon-iC™, a film...
An investigation was conducted in order to determine the effect of both the metallic transfer mode (pulsed arc or short circuit) and the O2 content in the Ar/O2 gas mixture, of the gas-metal arc welding process (GMAW), on the fatigue life under uniaxial conditions of welded joints of 316L stainless steel. It was concluded that the mixture of the sh...
In the present research, a nickel base coating was deposited on an AISI 1020 substrate using a high-velocity oxy-fuel technique. The coating was subsequently heat treated (HT) by means of an oxyacetylene flame. For the conditions evaluated in the present study, it was found that the HT coating has 1.15 times better wear resistance for the lower lev...
Cemented carbides coated with CVD multilayers are commonly used in metal cutting turning and milling operations. For many applications, a micro-blasting finishing procedure based on an impact treatment of the surfaces is carried out in order to smooth the coated surface and reduce sharp cutting edges. In this work, micro-blasting with corundum in a...
Wear experiments in the range of 25–600°C have been conducted on samples of D2 tool steel in different conditions involving unnitrided, nitrided and nitrided and coated with Balinit® A (TiN) and Balinit® Futura (TiAlN) deposited industrially at Balzers (Amherst, NY, USA), by means of PAPVD. The results indicate that coating the nitrided D2 tool ste...
Cemented carbides coated with CVD multilayers are commonly used in metal cutting turning and milling operations. For many applications, a micro-blasting finishing procedure based on an impact treatment of the surfaces is carried out in order to smooth the coated surface and reduce sharp cutting edges. In this work, micro-blasting with corundum in a...
The present investigation has been conducted in order to study three commercially available hard AlCrN-based coated substrates by means of nano- and microindentation, aimed at determining the intrinsic hardness of the films. The results obtained are subsequently discussed taking into consideration the residual stresses and structure (grain size and...
The aim of the present work was to study the effect of the mixing NiCrBSi with different amounts of WC-12%Co commercial powders on the corrosion resistance of deposited coatings using high velocity oxy-fuel (HVOF) process. For such purpose, NiCrBSiWFe powder alloy was mixed mechanically with different amounts of WC-12%Co powder. The powder mixture...
Due to their beneficial wear resistance, WC-Co hardmetals are widely used in industrial applications. An intrinsic weakness, however, is their corrosion susceptibility. The aim of this work was evaluate the influence of processing parameters on the corrosion resistance and morphology of a WC-10%Co commercial alloy thermally sprayed by using a Plasm...
In the present work, tribological performances of duplex coatings (Ti/TiN PVD and WC-Co HVOF) on Ti6Al4V substrates were investigated by analytical modelling and experimental assessment of mechanical/tribological properties. An analytical study of the contact stress distribution under a spherical indenter was performed, considering changes in stres...
Axial fatigue experiments have been conducted employing notched samples of a 316L stainless steel under both constant and variable amplitude loading. A number of samples were subjected to high cycle fatigue (HCF) in the range of ∼144,000–271,000 cycles and subsequent tensile tests, in order to evaluate the change in tensile mechanical properties du...
The present work evaluates the dry sliding wear performance of a 7075-T6 aluminum alloy autocatalytically coated with electroless Ni-P. Characteristics such as coating morphology, compositional variation of the coating through its thickness, as well as coating microhardness were reported. The wear tests were carried out in a tribometer, under ball-...
The present investigation has been conducted in order to determine the microstructural features, hardness and elastic modulus of two different WC–Co and WC–Co–Cr high velocity oxy fuel sprayed coatings. Particular emphasis has been given to the evaluation of the elastic modulus on the surface and cross-section of both coatings, employing three diff...
The present investigation has been conducted in order to study the effect of the deposition of a ZrN coating, of ∼3 μm in thickness, on the static mechanical properties and fatigue behavior of a 7075-T6 aluminum alloy substrate. It has been determined that the coating deposition process gives rise to a significant decrease in such properties, which...
Martensitic AISI420 stainless steel was plasma nitrided using a DC N2-Hz pulsed discharge, after thermal treatment at two different tempering temperatures. Sliding wear behavior was determined by means of a ball-on-disk tribometer at room temperature and without lubrication. Wear volume was calculated from the information provided by an optical pro...
The present work has been conducted in order to determine the microstructural features, hardness and elastic modulus of two different Ni-base coatings deposited by means of HVOF thermal spray, onto a SAE 1045 plain carbon steel substrate. The morphology and chemical composition of the phases that are present in the coatings were characterized by me...
The interfacial indentation test allows determining the interface toughness of a coating obtained by thermal spraying. During this test, a Vickers indentation is carried out on a cross-section of the sample. A crack is initiated and propagated along the interface. An analytical model allows defining an interface toughness representing the coating a...
The present investigation has been conducted in order to study the fatigue and corrosion fatigue behavior of an AA6063-T6 aluminum alloy substrate coated with a WC–10Co–4Cr deposited by HVOF thermal spraying. It has been determined that the deposition of such a coating on the aluminum substrate gives rise to significant gains in fatigue life in com...
The objective of the present work is to determine the influence of the heat treatment on the corrosion resistance of a Cr3C2–NiCr coating of 450 μm thickness, deposited by a vacuum plasma spray process (VPS) on a steel substrate. The post-heat treatment of the as-deposited coating was carried out in Ar at 400 °C and 800 °C, respectively. The coatin...
The present study has been carried out in order to investigate the fretting wear performance of a Ni–Cr based alloy, containing B and C, deposited onto a SAE 1045 steel substrate by HVOF thermal spray. Tests were conducted on both the uncoated and coated substrate, under unlubricated dry conditions, at different applied normal loads, cycles and amp...
The present investigation has been conducted in order to determine the residual stresses of an as-ground WC–12Co coating of two different thicknesses, by means of two different methods. Firstly, X-ray diffraction techniques, which allowed the determination of the surface residual stresses of the coating by means of the method called “sin2ψ” method....
Vacuum plasma spraying (VPS) was used to spray a Cr3C2–NiCr coating of ∼150, 300 and 450 μm in thickness onto a plain carbon steel substrate, employing a commercially available Cr20Ni9.5C powder. The splat microstructures observed in the coating were found to consist of a NiCr matrix with a predominant Cr3C2 phase, besides Cr7C3 and Cr2O3. The adhe...
Zirconium nitride was deposited by reactive unbalanced magnetron sputtering at different N2 partial pressures, on an AISI 316L stainless steel substrate. The mechanical properties of the coatings were evaluated by means of nanoindentation tests employing a Berkovich indenter and loads which varied between 120–9000 µN. The sliding wear behavior of t...
Nanocomposite films of ZrN-Ag were produced by reactive unbalanced magnetron sputtering, and their structural, chemical, mechanical, tribological, haemocompatibility, and antibacterial properties were studied as a function of film composition. The films formed a dense and homogeneous microstructure whereby nanocrystals of Ag are distributed evenly...
The aluminum alloy 7075-T6 is a structural alloy widely used for aeronautical applications due to its high relationship between mechanical resistance and weight. Depending upon the environmental conditions, many types of corrosion mechanisms such as intergranular, exfoliation, have been found to occur in aircraft structural aluminum alloys. A signi...
The present investigation has been conducted in order to determine the influence of both the chemical composition of the bath and current density employed, on the adhesion, hardness and wear resistance of electrolytic Sn–Ni coatings deposited on a steel substrate. The micro-scratch test method was employed to evaluate the coating adhesion. Three sc...
The present investigation has been conducted in order to develop a rational approach, able to evaluate quite accurately the depth of a nitrided tool steel that should be removed previous to hard PVD coating deposition, and the dependence of such depth on the nitriding conditions, information that cannot be obtained easily by means of simple metallo...
The present work evaluates the dry sliding wear performance of a 7075-T6 aluminum alloy autocatalytically coated with electroless Ni-P. Characteristics such as coating morphology, compositional variation of the coating through its thickness, as well as coating microhardness were reported. The wear tests were carried out in a tribometer, under ball-...
Vickers and Knoop hardness measurements performed on various ceramics (hard metals) and light alloy materials (soft metals) are compared. The results show that the Knoop hardness number is, in general, lower than the Vickers hardness number for the highest values of hardness, and this behaviour is reversed when the hardness values are low. This cha...
In this work, CrAlN films with Al/Cr atomic ratios between 0.02 and 1.4 were deposited on tool inserts by AC magnetron sputtering at 5 kW for three different Ar/N2 flow rates. The unique configuration of the inverted cylindrical magnetron sputtering (ICM-10) system enables the deposition of compositionally graded Cr–Al–N coatings under a single dep...
In the present work, the effect of the thickness of an electroless NiP load-support interlayer coating, on the initiation and development of plastic deformation in a 7075-T6 aluminium alloy substrate coated with a duplex coating has been investigated. The duplex system has been obtained by means of the deposition of an electroless Ni-11 wt. % P (EN...
In the present work, the effect of the thickness of an electroless NiP load-support interlayer coating, on the initiation and development of plastic deformation in a 7075-T6 aluminium alloy substrate coated with a duplex coating has been investigated. The duplex system has been obtained by means of the deposition of an electroless Ni-11 Wt. % P (EN...
Se ha llevado a cabo una investigacion con la finalidad de determinar el efecto, tanto del modo de transferencia metalica (arco pulsado o cortocircuito) como del contenido de O2 en la mezcla de gases protectores Ar/O2, del proceso de soldadura a tope mediante arco metalico con proteccion gaseosa (GMAW), sobre la vida a la fatiga en condiciones unia...
An investigation has been conducted in order to determine the effect of both the metallic transfer mode (pulsed arc or short circuit) and the O2 content in the Ar/O2 gas mixture, of the gas-metal arc welding process (GMAW), on the fatigue life under uniaxial conditions of welded joints of 316L stainless steel. It has been concluded that the mixture...
In this work, a systematic variation of the processing parameters, such as gas mixture, time of nitriding and current density, has been carried out to determine how these will influence the sliding wear behaviour of plasma nitrided layers on AISI H13. Optical profilometry and scanning electron microscopy were used to characterise the worn sample an...
An investigation has been carried out in order to study the fatigue performance, both in air and in a 3 wt.% NaCl solution, of a quenched and tempered (Q&T) SAE 4340 steel substrate coated with a TiCN film of ∼4 μm in thickness deposited by plasma assisted physical vapor deposition (PAPVD). The results obtained show that the presence of the coating...
The tensile and fatigue properties of a 6063-T6 aluminium alloy coated with an electroless Ni-P (EN) deposit have been investigated. The EN plating was in the as deposited condition, that is to say, without any post-heat treatment. The thickness of the coating was of about 40-50 Pm and it had a P content of similar to 9.5 wt-%. The results obtained...
In the present research, a nickel base coating was deposited on an AISI 1020 substrate by using high velocity oxy-fuel technique (HVOF). The coating was subsequently post heat -treated by means of an oxyacetylene flame. For the conditions evaluated in the present study, it was found that the CTT coating has 1,15 better wear resistance for the small...
The wear resistance of a PVD (Ti0.7Al0.3)N coating deposited on an as-received and gas nitrided AISI H13 has been examined by using ball-on-disc tests at room temperature and at 600 °C. In order to determine the influence of a previous heat treatment on this type of steel on the wear resistance of the (Ti0.7Al0.3)N coating, two commercial heat trea...
In the present research, a nickel base coating was deposited on an AISI 1020 substrate by using high velocity oxy-fuel technique (HVOF). The coating was subsequently post heat -treated by means of an oxyacetylene flame. For the conditions evaluated in the present study, it was found that the CTT coating has 1,15 better wear resistance for the small...
The AISI 316L stainless steel has been widely used in artificial knee or hip joints, as well as internal fixation devices. It is well known that this material has a good corrosion resistance and acceptable biocompatibility properties. Ion nitriding is a well established process for steel hardening that can also be applied to this kind of steels wit...
