Imre N. Orbulov

Imre N. Orbulov
Budapest University of Technology and Economics · Department of Materials Science and Engineering

PhD in Materials Science

About

82
Publications
13,334
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Introduction
Imre N. Orbulov currently works at the Department of Materials Science and Engineering, Budapest University of Technology and Economics. Imre does research in Materials Engineering, Mechanical Engineering and Engineering Education. His focus is on the mechanical and microstructural properties of composite metal foams and metal matrix syntactic foams. Imre is the leader of the MTA-BME Lendület Composite Metal Foams Research Group.
Additional affiliations
July 2012 - present
Hungarian Academy of Sciences
Position
  • Researcher
December 2009 - January 2016
Budapest University of Technology and Economics
Position
  • Research Assistant

Publications

Publications (82)
Article
This research provides a comparative study between metal syntactic foams (MSFs) manufactured using two different infiltration casting techniques. Counter-gravity infiltration (CGI) and low-pressure infiltration (LPI) casting methods are employed to manufacture aluminium alloy matrix MSFs with embedded lightweight expanded clay aggregate particles....
Article
Metal matrix syntactic foams are cellular materials in which the matrix is metal and within that matrix are non-metallic cells formed by filler material. These materials have low density, and besides that, they have high compressive strength and energy absorption. The main goal was to improve these properties by reinforcing the matrix with ceramic...
Article
This paper is dealing with the production and investigation (structural and mechanical) of composite metal foams (CMFs) with AlSi9MgMn matrix and ~60 vol% of different nominal diameter light expanded clay particles (LECPs) filler. The main aim was to produce a cheap CMF grade for automotive industry. The samples were produced by liquid state low pr...
Article
Full-text available
As cellular materials are gaining more ground in the automotive, airplane, and railway industries, the demand for functionally graded metal foams has appeared. In the case of syntactic metal foams, by changing the distribution of the filler material, the properties of the foams can be precisely adjusted according to the desired area of application....
Article
Metallic foams are designed to be generally used by the transportation industry as energy-absorbing reinforcements in bumper panels or as permanent cores for weight reduction. In composite metal foams (CMFs), the second phase is usually formed by hollow spheres or closed-wall porous materials responsible for the gas (void) intake. Herein, three typ...
Article
Metal matrix syntactic foams (MMSFs) with Al alloy matrix (Al99.5 and AlSi12) and pure Fe metallic hollow spheres (MHSs, 64 vol%) were produced by pressure infiltration process. The density of the produced MMSFs was between 1.18 and 1.54 g cm⁻³. Cylindrical samples were investigated by compressive tests in free (between rigid plates) and radially c...
Article
AlSi9Cu3(Fe) vacuum-assisted high pressure die cast (VPDC) specimens were investigated by experimental fatigue test and fracture mechanics approach. The aims of the investigations were (i) to evaluate the fracture resistance and (ii) to indirectly determine the threshold stress intensity value (ΔKth) of casting alloy in uniaxial tension. The specim...
Preprint
AlSi9Cu3(Fe) vacuum-assisted high pressure die cast (VPDC) specimens were investigated by experimental fatigue test and fracture mechanics approach. The aims of the investigations were (i) to evaluate the fracture resistance and (ii) to indirectly determine the threshold stress intensity value (ΔKth) of casting alloy in uniaxial tension. The specim...
Article
Full-text available
Metallic foams are developing more and more [...]
Chapter
Metal matrix composite syntactic foams (MMCSFs) are light-weight materials from the particulate reinforced metal matrix composites’ (MMCs) family. The filler particles in these materials are hollow inclusions such as hollow spheres, or other particles with inner porosity. In this viewpoint, MMCSFs can be sorted into the metallic foams group as well...
Article
Full-text available
High performance bimodal composite metal foams (BCMFs) have been produced by low-pressure infiltration of EN-AW Al99.5 and EN-AC AlSi12 alloys into two sets of different nominal diameter (2.4 mm and 7.0 mm) Al2O3 ceramic hollow spheres (CHSs) in a total of five different volume ratios arranged in random closed packing distribution. The structure of...
Article
Full-text available
In this study bimodal A413 matrix syntactic foams filled with ceramic hollow spheres (CHSs) were produced and examined by computer tomography (CT) and quasi-static mechanical testing to determine the mixing properties of the hollow spheres and the strength of the metal foam. Two hollow spheres of different nominal diameters (d 1 = 2.4 mm and d 2 =...
Article
In this study, the fatigue properties of functionally graded metal syntactic foams (FG-MSF) are investigated under cyclic loading. The functionally graded foams are produced by controlling the spatial distribution of weak expanded perlite and stronger activated carbon particles within a ZA27 alloy matrix. As a reference, uniform metal syntactic foa...
Article
Composite metal foams (CMFs) are increasingly used in automotive industry due to their relatively low weight and high energy absorbing capacity. During our research, bimodal composite metal foams (BCMFs) were produced, with ceramic hollow spheres (CHSs) as filler material. This ceramic is made of high-purity alumina (Al2O3). Two types of spheres we...
Article
Full-text available
High-pressure die casting (HPDC) is a near-net-shape process that produces high quality castings with narrow dimensional tolerances. The HPDC castings are being increasingly used due to good flexibility and high productivity, especially for the automotive industry. Depending on the location of the cast components, there are ever more complex geomet...
Article
Full-text available
Compression tests measured the mechanical properties of AlSi10MnMg matrix syntactic foams filled with lightweight expanded clay particles (LECAPs). The metal matrix syntactic foams were produced by low-pressure liquid state infiltration method. Two types of LECAPs were used during production. One with ∼3 mm diameter and the other type with ∼9 mm di...
Article
Full-text available
Metal matrix foams (MMFs) are mostly used in the automotive industry due to their high specific energy absorbing capacity and relatively low weight. During this research, bimodal metal matrix foams were produced, where the filler was ceramic hollow spheres (CHSs) made of high-purity alumina with the nominal diameters of Ød 1 = 7 mm and Ød 2 = 2.4 m...
Article
Full-text available
In this study, iron-based metal matrix syntactic foam (MMSF) containing hollow glass microspheres as filler was investigated with respect to notch sensitivity aspects. The MMSF was produced by means of metal powder injection molding. The notch sensitivity was studied via (i) elastic-plastic fracture mechanics measurements (determination of R-curves...
Article
Full-text available
Metal matrix syntactic foams (MMSFs) are high-performance foams consisting of a light-weight matrix and a set of porous fillers. The obstacle against the wide-spreading of MMSFs is their high cost (raised by the fillers’ price). In this study, low-cost MMSFs have been developed and characterised in the structure – mechanical properties relationship...
Article
Full-text available
AlSi9Cu3(Fe) aluminum alloy fatigue test specimens were produced by high pressure die casting (HPDC) and vacuum‐assisted die casting (VPDC) techniques. Non‐destructive material tests (NDT) have been performed on cast specimens by computed tomography (CT). Uniaxial fatigue tests with two stress ratios of R = −1 and R = 0.1 have been performed in the...
Article
Full-text available
This paper presents a new non-destructive method applying modal analysis to determine the failure state of the AlSi12 matrix syntactic foam containing ceramic hollow spheres. The results proved that the decrease in natural frequencies of the first two modes and the calculated effective Young’s modulus indicate the damage state of the syntactic foam...
Article
High performance metal matrix syntactic foams (MMSFs) have been produced by liquid state infiltration of AlSi12 alloy into two loosely packed sets of different nominal diameter (150 μm and 1500 μm) oxide hollow spheres (CHSs) and their mixed packs. The structure of the MMSFs has been studied by X-ray computer tomography and microscopy. The mechanic...
Article
Full-text available
Aluminum alloy (Al99.5 or AlSi12)-based metal matrix syntactic foams (MMSFs) were produced by pressure infiltration with ~65 vol % Globocer filler (33 wt % Al2O3, 48 wt % SiO2, 19 wt % Al2O3∙SiO2). The infiltrated blocks were machined by different geometry tools in order to produce notched samples. The samples were loaded in three-point bending, an...
Article
High-pressure die casting (HPDC) is a widely used casting technology for product that is made of light metal such as aluminum alloy. During the die casting process, the molten metal is injected into a mold at high speed and solidified under high pressure. The amount of porosity in the cast part is an important question. Lots of technologies have be...
Article
Full-text available
AlSi9Cu3(Fe) aluminum alloy specimens were produced by conventional high-pressure die casting (HPDC) and vacuum-assisted high-pressure die casting (VPDC) processes under atmospheric and 3 different absolute pressures of 170 mbar, 90 mbar, and 70 mbar. The influence of absolute pressure in the die cavity on the porosity and mechanical properties of...
Article
Full-text available
The fatigue properties of EP/A356 aluminium matrix syntactic foams were measured. Four different type of syntactic foam were produced in order to determine the relation between the density and the fatigue properties. The density range was set to be between 0.7 – 1.1 g/cm³. The measured values indicated that, both the fatigue limit and the slope of...
Article
Al99.5 and AlSi12 matrix syntactic foams were produced by pressure infiltration of Globocer grade ceramic hollow spheres. The produced aluminium matrix syntactic foams (AMSFs) were investigated by compressive tests, dynamic mechanical analysis (DMA), finite element methods (DMA) and elasticity based analytical calculations. The aim of the investiga...
Article
Metal matrix syntactic foams (MMSFs, often referred as composite metal foams (CMFs)) are lightweight materials with high specific strength. MMSFs are on the borderline between metal matrix composites and metal foams. On one hand MMSFs are composites, because they are filled by hollow particles and the particles may add strength to the material. On...
Article
The effective Young’s modulus of aluminium matrix syntactic foams was determined by modal analysis. Two different matrix materials (Al99.5 and AlSi12) were used, and they were reinforced by Globocer grade ceramic hollow spheres. In order to validate the results, a full-scale finite element model was also created. A new algorithm was developed to pl...
Article
Full-text available
Closed cell, high strength metallic foams, like ceramic hollow spheres filled metal matrix foams are promising materials to build lightweight but high specific strength structural parts. The aim of this study is to investigate the damage of the foam structure during monotone or cyclic compression. The tested metal matrix syntactic foams were produc...
Article
Full-text available
Closed cell, high strength metallic foams, like ceramic hollow spheres filled metal matrix foams are promising materials to build lightweight but high specific strength structural parts. The aim of this study is to investigate the damage of the foam structure during monotone or cyclic compression. The tested metal matrix syntactic foams were produc...
Article
Full-text available
Hybrid syntactic foams with AlSi12 aluminium matrix were produced by pressure infiltration. The volume ratio of iron to ceramic hollow sphere reinforcement (in the same size range) was varied, and hybrid syntactic foams were also produced with bimodal size ceramic reinforcement. Previously, a very detailed analysis of the mechanical properties of t...
Article
Metal matrix syntactic foams, consisting of two grades of aluminium alloys and a set of oxide ceramic hollow spheres, were investigated in the aspect of cyclic loading. The results of the compressive – compressive cyclic loading with the load asymmetry factor of R=0.1 ensured full reliability design data for the investigated material in the lifetim...
Article
The main purpose of this paper is to present the basic fatigue properties of metal matrix syntactic foams. The investigated syntactic foams consisting of expanded perlite and A356 aluminum matrix were produced using an inert gas pressure infiltration technique. The obtained foams were subjected to cyclic compressive loading in order to investigate...
Article
Syntactic foam containing hollow ceramic spheres with an average outer diameter of 1.45 mm and wall thickness of 58 µm was produced using the pressure infiltration technique. This paper presents the analysis of the compressive deformation mechanisms of these syntactic foams using the acoustic emission (AE) technique. The active deformation mechanis...
Article
Full-text available
Iron hollow sphere filled aluminum matrix syntactic foams (AMSFs) were produced by low pressure, inert gas assisted infiltration. The microstructure of the produced AMSFs was investigated by light and electron microscopy, extended by energy dispersive X-ray spectroscopy and electron back-scattered diffraction. The investigations revealed almost per...
Article
Full-text available
Aluminium alloy syntactic foams reinforced with iron hollow spheres were produced by low pressure, liquid phase inert gas infiltration technique. Four Al alloys (Al99.5, AlSi12, AlMgSi1 and AlCu5) and Globomet grade iron hollow spheres were used as matrix and reinforcing material, respectively. The produced composite blocks were characterised accor...
Article
Aluminum alloy matrix syntactic foams were produced by inert gas pressure infiltration. Four different alloys and ceramic hollow spheres were applied as matrix and filler material, respectively. The effects of the chemical composition of the matrix and the different heat-treatments are reported at different strain-rates and in compressive loadings....
Article
Full-text available
High quality aluminium matrix syntactic foams (AMSFs) were produced by pressure infiltration. This method can ensure the maximal volume fraction of the reinforcing hollow spheresand very low amount of unwanted or matrix porosities. By this method hybrid MMSFs with mixed metal and ceramic hollow spheres were also produced. The matrix material was Al...
Conference Paper
Full-text available
Closed cell, high strength metallic foams, like ceramic hollow sphere reinforced metal matrix syntactic foams are distinguished materials to build light structural parts. The applications can range from load bearing structures to vibration damping structural parts like machine beds, spindles etc. In the latter case the fatigue properties are necess...
Article
Full-text available
Hybrid metal matrix syntactic foams (hybrid MMSFs) are particle reinforced composites in which the reinforcement is the combination of more than one grade of hollow spheres. The difference between the spheres can be in their chemical composition, dimension, physical properties etc. In this study AlSi12 matrix hybrid MMSFs with monomodal Globocer (A...
Article
Full-text available
Metal matrix syntactic foam (MMSF) blocks were produced by an inert gas-assisted pressure infiltration technique. MMSFs are advanced hollow sphere reinforced-composite materials having promising application in the fields of aviation, transport, and automotive engineering, as well as in civil engineering. The produced blocks were investigated in fre...
Article
Full-text available
Fém- (GM) és kerámiagömbhéj (GC) erősítésű AlSi12 mátrixú hibridkompozitokat állítottunk elő nyomásos infiltrálással. A GM gömbhéjak tiszta vasból, míg a GC jelű gömbhéjak Al2O3+SiO2 keverékéből épültek fel. A gömbhéjak térkitöltését minden esetben ~65 tf%-on tartottuk, de változtattuk a GM és GC gömbhéjak arányát 20%-os lépésekben (100% GM + 0% GC...
Presentation
Full-text available
A 3. Trans-Trio-Sciences Konferencia előadása
Presentation
Full-text available
A IX. Országos Anyagtudományi Konferencia (OATK 2013) előadása
Article
Metal matrix syntactic foams (MMSFs) were produced by pressure infiltration. Two parameters of the infiltration process (pressure and time) were varied and the infiltrated length was measured as the function of infiltration parameters in order to get data for the implementation of pressure infiltration as mass-production of MMSFs similar to injecti...
Article
Full-text available
Ceramic hollow microsphere reinforced metal matrix syntactic foams were produced by means of pressure infiltration. The reinforcing ceramic hollow microsphere’s (SL300) microstructure was investigated. The microspheres contained various oxide ceramics, mainly Al2O3 and SiO2. The samples were characterized using X-ray diffraction measurements and en...
Article
Full-text available
The mathematical description of the compressive behaviour of metal matrix syntactic foams (MMSFs) was investigated and analysed in order to provide continuous functions as input data for finite element and other numerical methods. MMSFs are advanced composite materials having promising application fields in aviation, transport and automotive indust...
Conference Paper
Full-text available
Alumíniummátrixú szintaktikus habokat vizsgáltunk mikroszerkezeti szempontból. Mátrixanyagként Al99,5 és AlSi12 alumíniumötvözetet használtunk. Energiadiszperzív röntgenspektroszkópiás mérésekkel vizsgáltuk a gömbhéj-alapanyag átmenetet és jelentős mértékű oldódást tapasztaltunk a mátrixanyagba. Sikeresen készítettünk elő mintákat visszaszórt elekt...
Presentation
Full-text available
A XXI Nemzetközi Gépészeti Találkozó (OGÉT 2013) konferencia előadása
Article
The most promising process for metal matrix syntactic foam (MMSF) production is pressure infiltration. In case if it can be advanced to die casting the cost of the MMSFs will drop significantly. The first step on this road is to characterize the kinetics of the pressure infiltration with respect to infiltration pressure and time. Experimental infil...
Article
Three ultrahigh molecular weight polyethylene (UHMWPE) composites of differing composition, reinforced with multiwalled carbon nanotubes (MWCNT) were prepared. The homogeneous distribution of MWCNT has been attempted by two dry blending methods and one melt-mixing process. The efficiency of the various methods was characterized by their effects on...
Article
Full-text available
Conducting composites based on graphite, carbon black and polypropylene have been prepared and the effect of composition on the flexural modulus and electrical conductivity has been studied. The conductivity of polymers containing only one kind of filler did not increase significantly, their modulus of elasticity was the highest for graphite fillin...
Article
Full-text available
A special class of metallic foams, the so called metal matrix syntactic foams was produced by pressure infiltration technique. Metal matrix syntactic foams consist of a light-weight metal matrix and a set of hollow spheres. Microstructural investigations were done on polished specimens. The results showed almost perfect infiltration and thin interf...
Article
Full-text available
http://mit.imt.si/Revija/izvodi/mit124/orbulov.pdf Metal-matrix composites reinforced by ceramic hollow microspheres were produced as special porous metals, called metal-matrix syntactic foams (MMSFs). In this paper the microstructure of the ceramic hollow microspheres as reinforcing elements is investigated in connection with the production of MM...
Article
Two types of metal matrix syntactic foams (MMSFs) were produced by pressure infiltration from the combination of technical purity aluminium (Al99.5) and two ceramic hollow sphere grades. The MMSFs were investigated by compression tests; the compressive strength, the fracture strain, the structural stiffness and the absorbed mechanical energy were r...
Conference Paper
Full-text available
Some microstructural aspects of metal matrix syntactic foams were investigated. Al99.5, AlSi12, AlCu5 and AlMgSi1 alloys were used as matrix material. The interface zone between the ceramic spheres and the matrices were investigated with energy dispersive x-ray spectroscopy. The line and map scans showed Mg enrichment on the spheres’ outer surface...
Presentation
Full-text available
Presentation for the Eighth International Conference on Mechanical Engineering (Gépészet 2012) conference
Article
The compressive behaviour of eight different metal matrix syntactic foams (MMSFs) are investigated and presented. The results showed that the engineering factors as chemical compositions of the matrix material, the size of the microballoons, the previously applied heat treatment and the temperature of the compression tests have significant effects...
Article
Full-text available
The compressive behaviour of three different metal matrix syntactic foams (MMSFs) was investigated. The results showed that the engineering factors such as the size of the used hollow spheres, the aspect ratio (height / diameter ratio) of the specimens and the temperature of the tests have significant effects on the compressive strength and propert...
Article
Full-text available
http://www.ombkenet.hu/images/stories/kohaszat2012_05.pdf Kerámia gömbhéjerősítésű fémmátrixú kompozitokat állítottunk elő nyo másos infiltrálással. Vizsgáltuk a mikrogömbhéjak mikro szerkezetét külön és öt alumíniumötvözet mátrixanyaggal kapcsolatban. A gömbhéjak főként Al2O3 és SiO2 tartalmú oxidkerámiák. A mintákon röntgendiffrakciós vizsgálato...
Presentation
Full-text available
A XIX. Nemzetközi Gépész Találkozó (OGÉT 2011) konferencia előadása
Article
Full-text available
This paper deals with the mathematical description of metal matrix syntactic foams (MMSFs). MMSFs are advanced materials having promising application fields in aviation, transport and automotive industry, in civil engineering and in many other industrial fields. They are porous materials having low density and relatively high compression strength e...
Article
Full-text available
Ceramic hollow microballoons were incorporated into aluminium matrix to produce metal matrix syntactic foams (MMSFs). Syntactic foams have low density and relatively high strength; therefore they can be used as materials of many important parts in automotive technology or in aviation and sea industry. The MMSFs can be produced by pressure infiltrat...
Article
Full-text available
Carbon fiber reinforced aluminum matrix composite blocks and a pipe (as semi-product) were produced by pressure infiltration technique. In this paper the authors deal with the production method and investigations of the blocks and the pipe. In our composites AlSi12 eutectic aluminiumsilicon alloy was used as matrix material. The reinforcements were...
Conference Paper
Full-text available
Metal matrix composites (MMCs) ensure outstanding application possibilities in many industrial fields; therefore the development of half-industrial and industrial products is extremely important. In our work a MMC pipe was produced by pressure infiltration technique. Near eutectic AlSi12 aluminium alloy was used as matrix material. The reinforcemen...
Article
Full-text available
Six types of metal matrix syntactic foams (MMSFs) were produced by pressure infiltration technique. The foams were investigated by upsetting tests at increased (220°C) and at room (25°C) temperature. The parameters were the constituents of the composites and the aspect ratio (height-diameter ratio, H/D) of the specimens. The characteristic properti...
Conference Paper
Full-text available
Metal matrix syntactic foams have been produced by pressure infiltration. Four type of matrix material were used: Al99.5, AlSi12, AlCu5 and AlMg1Si1. The filler materials were SL150 and SL300 type ceramic hollow microspheres (Envirospheres Pty. Ltd., Australia). The microspheres are contained about 40 wt% Al2O3 and about 60 wt% SiO2. Their average...