Leszek Łatka

Leszek Łatka
Wroclaw University of Science and Technology | WUT · Institute of Production Engineering and Automation

PhD. DSc. Prof. WUST

About

75
Publications
19,118
Reads
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735
Citations
Additional affiliations
October 2012 - present
Wroclaw University of Science and Technology
Position
  • Professor (Assistant)
Description
  • - welding techniques (laboratory and projects); - hardfacing techniques; - spraying techniques; - metrology in mechanics; - special methods of joining
February 2011 - January 2012
University of Limoges
Position
  • PhD Student

Publications

Publications (75)
Article
Full-text available
In this paper, three commercial cermet powders, WC-Co-Cr, WC-Co and WC-Cr3C2-Ni, were sprayed by the High Velocity Oxy Fuel (HVOF) method onto magnesium alloy AZ31 substrate. The coatings were investigated in terms of their microstructure, phase analysis and residual stress. The manufactured coatings were analyzed extensively using optical microsco...
Article
Full-text available
The study presents a data-driven framework for modelling parameters of hardfacing deposits by GMAW using neural models to estimate the influence of process parameters without the need of creating experimental samples of the material and detailed measurements. The process of GAS Metal Arc Welding (GMAW) hardfacing does sometimes create non-homogenou...
Article
Full-text available
The paper presents the computational studies on the microstructure of WC-Co-Cr coatings deposited by High Velocity Oxy Fuel spraying (HVOF). The study covers the porosity assessment according to ASTM E2109-01 standard, carried out in ImageJ software, in terms of volume porosity, size and shape of the pores. The evaluation was preceded by scanning e...
Article
In this work, the tungsten carbide reinforcement in cobalt matrix (WC-Co-Cr) coatings was studied. The deposition process was carried out by high-velocity oxy-fuel spraying (HVOF). The study aimed to investigate the influence of one of the key process parameters, namely spray distance, on the coatings’ microstructure and phase composition, as well...
Article
Full-text available
Thermally sprayed ceramic coatings are applied for the protection of surfaces that are exposed mainly to wear, high temperatures, and corrosion. In recent years, great interest has been garnered by spray processes with submicrometric and nanometric feedstock materials, due to the refinement of the structure and improved coating properties. This pap...
Article
Magnesium alloys are very interesting engineering materials due to their very high strength to density ratio (the best among metallic alloys). However, because of low hardness as well as low resistance against erosion, abrasion and corrosion, their applications in the industry is very limited. In order to improve mechanical performances, deposition...
Article
Full-text available
In the present study, two different cermet coatings, WC–CrC–Ni and Cr3C2–NiCr, manufactured by the high-velocity oxy-fuel (HVOF) method were studied. They are labeled as follows: WC–CrC–Ni coating—WC and Cr3C2–NiCr coating—CrC. These coatings were deposited onto a magnesium alloy (AZ31) substrate. The goal of the study was to compare these two type...
Book
Full-text available
This book comprises the abstracts of the reports (presentations) for the plenary, oral and poster sessions of the International Conference “Advanced materials manufacturing and research: new technologies and techniques” (AMM&R-2021 online). This conference was a virtual conference which was open to academic researchers, industrial scientists, busin...
Article
This paper discusses the influence of using 13 wt% of TiO2 addition to Al2O3 powder and selection of plasma spray parameters on morphology, microstructure, phase composition, mechanical properties, and, particularly, tribological behaviour and cavitation erosion performance of produced coatings. Two types of powders were used to spray the coatings...
Article
Nano-titania (TiO2) has drawn considerable attention for decades for its excellent photocatalytic activity. The use of photocatalyst TiO2 in the form of surface coating is usually desired for long-term recyclable photocatalytic performances. Yet deposition of the coatings with appropriate nanostructures persists challenging. Thermal spray processin...
Article
Full-text available
The aim of the article is to build-up a simplified model of the effect of atmospheric plasma spraying process parameters on the deposits' functional properties. The artificial neural networks were employed to elaborate on the model and the Matlab software was used. The model is crucial to study the relationship between process parameters, such as s...
Article
In this work suspension-high velocity oxygen fuel spraying (S-HVOF) and suspension plasma spraying (SPS) were applied to produce Al2O3 coatings using home-made and commercial available Al2O3 water-based liquid feedstocks containing 40 wt% of submicrometer-sized raw powders. The aim of this study was to investigate the differences in the microstruct...
Article
Full-text available
The study aims to elaborate a neural model and algorithm for optimizing hardness and porosity of coatings and thus ensure that they have superior cavitation erosion resistance. Al 2 O 3-13 wt% TiO 2 ceramic coatings were deposited onto 316L stainless steel by atmospheric plasma spray (ASP). The coatings were prepared with different values of two sp...
Article
Titanium dioxide is a very popular ceramic material due to its outstanding properties, e.g. photocatalytic conversion. Titania coatings are able to activate chemical reactions on its surface. However, photocatalytic activity strongly depends on crystal structure, the size and shape of crystallites and also the surface area. This article is devoted...
Article
Full-text available
The work focuses on issues related to the soldering of graphite composite to 6060 aluminum alloy. The graphite composite is of great interest of the transportation industry as it is widely used in slides responsible for current collection from overhead catenary. The slides should meet various criteria resulting from relatively complex working condi...
Preprint
Full-text available
The study aims to elaborate a neural model and algorithm for optimising hardness and porosity of coatings and thus ensure that they have superior cavitation erosion resistance. Al2O3-13wt.%TiO2 ceramic coatings were deposited onto 316L stainless steel by atmospheric plasma spray (ASP). The coatings were prepared with different values of two spray p...
Article
Full-text available
In this work, the yttria stabilised zirconia ZrO2 + 8 wt % Y2O3 (YSZ) coatings were studied. The coatings were manufactured by a relatively new method based on liquid feedstock, named: suspension plasma spraying (SPS). The main aim of the study was to investigate the influence of one of the fundamental process parameter, stand-off distance, on the...
Article
Full-text available
The paper briefly describes major thermal spray techniques used to spray functionally graded coatings such as atmospheric plasma spraying, high velocity oxy-fuel spraying, suspension and solution precursor plasma spraying, and finally low and high pressure cold gas spray method. The examples of combined spray processes as well as some examples of p...
Article
Full-text available
The paper investigates the cavitation erosion (CE) and sliding wear (SW) resistance of cold-sprayed Al/Al2O3 and Cu/Al2O3 composites and studies them in relation to a set of metallic materials such as aluminium alloy (AlCu4Mg1), pure copper (Cu110), brass (CuZn40Pb2) and stainless steel (AISI 304). The coatings were deposited on stainless steel by...
Article
Full-text available
In present work the Cr3C2–NiCr coating was deposited on magnesium alloy substrate with high velocity oxygen fuel (HVOF) spraying. The microstructure of the samples has been characterized by means of electron microscopy, SEM and phase composition analysis carried out. The porosity of coatings has been also estimated. Finally, tests of selected mecha...
Conference Paper
Full-text available
Bulk cobalt-and nickel-based metallic materials exhibit superior resistance to cavitation erosion and sliding wear. Thus, thermally deposited High Velocity Oxygen Fuel (HVOF) coatings seem promising for increasing the wear resistance of the bulk metal substrate. However, the effect of chemical composition on the cavitation erosion and sliding wear...
Article
Full-text available
The investigation into wear resistance is an up-to-date problem from the point of view of both scientific and engineering practice. In this study, HVOF coatings such as MCrAlY (CoNiCrAlY and NiCoCrAlY) and NiCrMo were deposited on AISI 310 (X15CrNi25-20) stainless steel substrates. The microstructural properties and surface morphology of the as-spr...
Article
Full-text available
In this work, the alumina (Al2O3) and alumina-titania coatings with different contents of TiO2, i.e., Al2O3-13 wt.% TiO2 and Al2O3-40 wt.% TiO2, were studied. The coatings were produced by means of powder and liquid feedstock thermal spray processes, namely atmospheric plasma spraying (APS), suspension plasma spraying (SPS) and suspension high-velo...
Article
Full-text available
Surface modification is one of the most intensively studied issue of technology, which is related to the almost all branches of industry. Since more than 100 years the huge number of methods has been developed and are still in growth. On this field the plasma transferred arc (PTA) hardfacing and surfacing is one of the most frequently used group of...
Article
Full-text available
In this paper Al2O3 + 13 wt% TiO2 ceramic coatings manufactured by Atmospheric Plasma Spraying (APS) have been investigated. The commercial feedstock materials, Metco 6221 (top coat) and Amdry 4535 (bond coat) have been deposited on stainless steel coupons. The main goal of researches was to determine the influence of critical plasma spray paramete...
Article
Full-text available
In the field of the development of modern techniques, which improve and/or regenerate the component’s surface properties, High Velocity Oxygen Fuel (HVOF) spraying of carbides or metals and their alloys is a good alternative method to other conventional surface engineering ones, including magnesium foundry alloys. Coatings manufactured by thermal s...
Article
Full-text available
The Al2O3 + TiO2 coatings are of the interest of surface technology and tribology due to their good wear resistance and enhanced toughness comparing to pure Al2O3 coatings. However, the detailed effect of the used feedstock powder, is often neglected. Here, this work focuses on the deposition of Al2O3 + 13 wt % TiO2 coatings by atmospheric plasma s...
Article
Full-text available
The ceramic coatings based on mixture of Al 2 O 3 and TiO 2 have better properties in comparison to the pure alumina ones. Among many techniques, plasma spraying is very useful method of ceramic coatings manufacturing. In this paper, the results of microscopic, mechanical and tribological properties investigations of Al 2 O 3 + 13 wt% TiO 2 coating...
Article
Full-text available
Atmospheric Plasma Spraying (APS) enables deposition of coatings from different materials, including those based on Al2O3 and TiO2. In this work, Al2O3 + 40 wt.% TiO2 coatings were tested. The relationships between mechanical properties, microstructure and spraying parameters (namely: spraying distance and torch scan velocity) were investigated. Co...
Article
In this paper, the results of tribological, microscopic and mechanical research of Al2O3 and Al2O3 + 40 wt.% TiO2 coatings manufactured by atmospheric plasma spraying (APS) were presented. The feedstock materials were Al2O3 (Metco 6103, Oerlikon Metco) and Al2O3 + 40 wt.% TiO2 (Metco 131VF, Oerlikon Metco) powders with the average grain size of 30...
Article
Full-text available
The Al2O3+TiO2 coatings are of the interest of surface engineering due to their high hardness and wear resistance but also increased toughness, when compared to pure Al2O3 ones. This article describes the deposition of Al2O3+3 wt.% TiO2 coatings by Atmospheric Plasma Spraying (APS) technique. The commercial AMI 6300.1 powder (-45 + 22 μm) was used...
Article
In the paper the results of tribological, microscopic, and mechanical research of Al2O3 + TiO2 coatings manufactured by plasma spraying are presented. The feeding material was a powder Al2O3 + 13 wt.% TiO2 (Metco 6221, OerlikonMetco) with grain size – 45 ± 15 μm. The cylinder substrates made from stainless steel (X5CrNi18-10) had a diameter equal t...
Article
Full-text available
Thermal barrier coatings (TBC) is one of the most intensively studied of coatings’ applications area. From 1970’s TBC are developed in two independent ways: (i) development in new materials, with lower thermal conductivity, better erosion resistance and better thermal shock resistance or (ii) development in new deposition techniques. On this field...
Article
Full-text available
The paper presents the main results of development and optimization of the synthesis of hydroxyapatite and the application of the micro-plasma spraying technique for biocompatible coatings. The hydroxyapatite synthesis was optimized using the mathematical modelling method. Synthesized hydroxyapatite was studied by IR spectrometry and X-ray diffract...
Article
The presented studies are focused on the microstructure characterization of zirconia-based coatings deposited by two types of high-energy plasma torches: (i) Axial III; and, (ii) hybrid version of Water-Stabilized Plasma (WSP) torch. The suspensions were formulated using solid dispersed phase of (i) zirconia stabilized with 14 wt% of Y2O3 and (ii)...
Article
Full-text available
The paper presents the computational studies of microstructure- and topography- related features of suspension plasma sprayed (SPS) coatings of yttria-stabilized zirconia (YSZ). The study mainly covers the porosity assessment, provided by ImageJ software analysis. The influence of boundary conditions, defined by: (i) circularity and (ii) size limit...
Conference Paper
Full-text available
The possibility of producing nano-sized coatings by thermal spray processes seems to be very interesting for many industrial applications. Due to the small size of the grains, it is possible to achieve the properties which are not observed in the micrometric scale on the same kind of material. The aim of the current work is to present the alternati...
Conference Paper
Full-text available
The single cathode plasma torch SG-100 was used to spray suspension prepared with the use of two kinds of commercial powders ZrO2+8 wt. % Y2O3 (8YSZ) and ZrO2 + 24 wt.% CeO2 + 2.5 wt.% Y2O3 (24CeYSZ). The suspensions were formulated using finely milled solid phase, water and ethanol. The operational spray parameters being the same for each powder w...
Article
Bioactive glass coatings deposited via suspension plasma spraying were studied to improve the adhesion between orthopaedic implants and bone. Fine powders of a bioactive glass, named BG_Ca, having composition (in wt.%): 4.7 Na2O, 42.3 CaO, 6.1 P2O5, and 46.9 SiO2, were produced and dispersed in ethanol to form a suspension used as a feedstock. Vari...
Article
Bioactive glass coatings deposited via suspension plasma sprayingwere studied to improve the adhesion between orthopaedic implants and bone. Fine powders of a bioactive glass, named BG_Ca, having composition (in wt.%): 4.7 Na2O, 42.3 CaO, 6.1 P2O5, and 46.9 SiO2, were produced and dispersed in ethanol to form a suspension used as a feedstock. Vario...
Article
The microstructure of ZrO 2 + 8 wt.% Y 2 O 3 coatings has been studied by means of transmission electron micros-copy (TEM) including selected-area electron diffraction (SAED) and electron backscatter diffraction (EBSD). The coatings were suspension-plasma-sprayed onto stainless steel substrates. The parameters spray distance and torch scan speed ha...
Data
Full-text available
The microstructure of ZrO 2 + 8 wt.% Y 2 O 3 coatings has been studied by means of transmission electron micros-copy (TEM) including selected-area electron diffraction (SAED) and electron backscatter diffraction (EBSD). The coatings were suspension-plasma-sprayed onto stainless steel substrates. The parameters spray distance and torch scan speed ha...
Data
Bioactive glass coatings deposited via suspension plasma spraying were studied to improve the adhesion between orthopaedic implants and bone. Fine powders of a bioactive glass, named BG_Ca, having composition (in wt.%): 4.7 Na 2 O, 42.3 CaO, 6.1 P 2 O 5 , and 46.9 SiO 2 , were produced and dispersed in ethanol to form a suspension used as a feedsto...
Article
Full-text available
Plasma generated by the SG-100 torch was applied to spray suspension formulated with the use of ZrO2 + 8 wt.% Y2O3 (8YSZ) and ZrO2 + 24 wt.% CeO2 + 2.5 wt.% Y2O3 (24CeYSZ) as solid phases. The suspensions were formulated with the use of 20 wt.% solid phase, 40 wt.% water, and 40 wt.% ethanol. The plasma spray parameters were optimized by keeping co...
Article
Bioactive glass coatings deposited via suspension plasma spraying were studied to improve the adhesion between orthopaedic implants and bone. Fine powders of a bioactive glass, named BG_Ca, having composition (in wt.%): 4.7 Na 2 O, 42.3 CaO, 6.1 P 2 O 5 , and 46.9 SiO 2 , were produced and dispersed in ethanol to form a suspension used as a feedsto...
Article
The microstructure of ZrO2+8 wt.% Y2O3 coatings has been studied by means of transmission electron microscopy (TEM) including selected-area electron diffraction (SAED) and electron backscatter diffraction (EBSD). The coatings were suspension-plasma-sprayed onto stainless steel substrates. The parameters spray distance and torch scan speed had been...
Article
Plasma generated by SG-100 torch was applied to spray suspension formulated with the use of ZrO2+8 wt.% Y2O3 (8YSZ) solid phase. The solids have the mean size of about 4.5 μm and were obtained by milling commercial Metco 204NS powder. The suspension was formulated with the use of 20 wt.% of solid phase, 40 wt.% water and 40 wt.% of ethanol. The pla...