Centrifugal Infiltration of Porous Ceramic Preforms by the Liquid Al Alloy – Theoretical Background and Experimental Verification

Dolata-Grosz, A.

doi:10.1515/amm-2016-0075

Cited by 9 publications

(14 citation statements)

References 25 publications

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“…The second foam, Al 2 O 3 _2, is characterized by larger pore diameters and a much greater dispersion of their size from 300 to 1150 μm, where over 50% of cell sizes were in the range of 800–1150 μm ( Figure 1 b and Figure 2 b). To shape the castings, locally reinforced via ceramic skeletons with known spatial structures, and the centrifugal infiltration process were used [ 27 , 28 , 29 , 30 ]. As a result of the centrifugal force acting on the liquid AlSi12 alloy surface, castings containing a composite layer with percolation structure were obtained ( Figure 3 ).…”

Section: Methodsmentioning

confidence: 99%

“…In our own previous papers [ 27 , 28 , 29 , 30 ], the theoretical background, results of experiments and structure of AlSi12/Al 2 O 3 interpenetrating composite layers obtained by the centrifugal infiltration method, have been described in detail. The aim of research presented in this work was to compare the tribological properties (wear resistance, friction coefficient) of these composites with unreinforced AlSi12 matrix alloy.…”

Section: Introductionmentioning

confidence: 99%

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Tribological Properties of AlSi12-Al2O3 Interpenetrating Composite Layers in Comparison with Unreinforced Matrix Alloy

Dolata-Grosz

2017

Materials

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Alumina-Aluminum composites with interpenetrating network structures are a new class of advanced materials with potentially better properties than composites reinforced by particles or fibers. Local casting reinforcement was proposed to take into account problems with the machinability of this type of materials and the shaping of the finished products. The centrifugal infiltration process fabricated composite castings in the form of locally reinforced shafts. The main objective of the research presented in this work was to compare the tribological properties (friction coefficient, wear resistance) of AlSi12/Al 2 O 3 interpenetrating composite layers with unreinforced AlSi12 matrix areas. Profilometric tests enabled both quantitative and qualitative analyses of the wear trace that formed on investigated surfaces. It has been shown that interpenetrating composite layers are characterized by lower and more stable coefficients of friction (µ), as well as higher wear resistance than unreinforced matrix areas. At the present stage, the study confirmed that the tribological properties of the composite layers depend on the spatial structure of the ceramic reinforcement, and primarily the volume and size of alumina foam cells.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tribological Properties of AlSi12-Al2O3 Interpenetrating Composite Layers in Comparison with Unreinforced Matrix Alloy

Dolata-Grosz

2017

Materials

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“…The primary problem for all systems (i.e., ceramic–ceramic, metal–metal, and ceramic–metal) using these methods is the proper selection of sintering conditions to ensure low porosity and strong bonding between powder grains. Open-celled foam or other open-network substrates have been filled by liquid metal using pressure infiltration [ 39 , 40 , 41 , 42 , 43 ] and centrifugal casting [ 44 ] or by the vibro-compaction of metal powder-foam systems and additional sintering under pressure [ 45 ]. The main technological challenges for these technologies are ensuring strong bonding between components and low composite porosity.…”

Section: Introductionmentioning

confidence: 99%

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

et al. 2021

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The new in situ fabrication process for Mg-Mg2Si composites composed of interpenetrating metal/intermetallic phases via powder metallurgy was characterized. To obtain the designed composite microstructure, variable nanosilicon ((n)Si) (i.e., 2, 4, and 6 vol.% (n)Si) concentrations were mixed with magnesium powders. The mixture was ordered using a sonic method. The powder mixture morphologies were characterized using scanning electron microscopy (SEM), and heating and cooling-induced thermal effects were characterized using differential scanning calorimetry (DSC). Composite sinters were fabricated by hot-pressing the powders under a vacuum of 2.8 Pa. Shifts in the sintering temperature resulted in two observable microstructures: (1) the presence of Mg2Si and MgO intermetallic phases in α-Mg (580 °C); and (2) Mg2Si intermetallic phases in the α-Mg matrix enriched with bands of refined MgO (640 °C). Materials were characterized by light microscopy (LM) with quantitative metallography, X-ray diffraction (XRD), open porosity measurements, hardness testing, microhardness testing, and nanoindentation. The results revealed that (n)Si in applied sintering conditions ensured the formation of globular and very fine Mg2Si particles. The particles bonded with each other to form an intermetallic network. The volume fraction of this network increased with (n)Si concentration but was dependent on sintering temperature. Increasing sintering temperature intensified magnesium vaporization, affecting the composite formation mechanism and increasing the volume fraction of silicide.

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“…Porous components that employ a metal matrix composite with Al 2 O 3 foams and carbon foams are known as inter alia [17][18][19][20][21]. Carbon foams are noted as advanced independent materials with different pore sizes, which are used in high-temperature applications such as heat exchangers, filters for liquid metals technologies, and elements of catalysts and biomaterials [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Magnesium Matrix Composite with Open-Celled Glassy Carbon Foam Obtained Using the Infiltration Method

Olszówka-Myalska

Godzierz

Myalski

et al. 2019

Metals

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In this study, we present a new composite material that was developed using the pressure infiltration method. In this composite, carbon reinforcement in the form of an open-celled rectangular foam (C of ) was applied, and pure magnesium with two commercial magnesium cast alloys (AZ31, RZ5) was used as the matrix. We examined the microstructure (LM, SEM + EDS) of composites as well as the density, porosity, hardness, compressive strength, flexural strength and tribological properties in dry conditions. It was revealed that the chemical composition of the matrix had a significant impact on the macrostructure, microstructure and properties of the composite. The matrix with rare elements (RZ5) induced poor infiltration of C of and physicochemical degradation of the reinforcement, while pure magnesium ensured good infiltration, a stable friction coefficient and low wear. For the AZ31 alloy, the effects of infiltration were good; however, an increase in the tribological properties was not observed. Compared with the as-cast matrix materials, the presence of carbon foam in both pure Mg and AZ31 alloy induced an increase in compressive strength and stiffness as well as a decrease in flexural strength. Furthermore, SEM examination of the fractured and wear surfaces microstructure showed structural effects' dependence on the matrix composition.

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Centrifugal Infiltration of Porous Ceramic Preforms by the Liquid Al Alloy – Theoretical Background and Experimental Verification

Cited by 9 publications

References 25 publications

Tribological Properties of AlSi12-Al2O3 Interpenetrating Composite Layers in Comparison with Unreinforced Matrix Alloy

Tribological Properties of AlSi12-Al2O3 Interpenetrating Composite Layers in Comparison with Unreinforced Matrix Alloy

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

Magnesium Matrix Composite with Open-Celled Glassy Carbon Foam Obtained Using the Infiltration Method

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