The Experts below are selected from a list of 23196 Experts worldwide ranked by ideXlab platform
Rebecca L. Higginson - One of the best experts on this subject based on the ideXlab platform.
-
dry sliding wear behaviour of co continuous ceramic Foam aluminium alloy interpenetrating composites produced by pressureless infiltration
Wear, 2012Co-Authors: Jing Liu, Jon G P Binner, Rebecca L. HigginsonAbstract:Abstract Metal–ceramic interpenetrating composites (IPCs) consist of 3D-continuous matrices of discrete metal and ceramic phases. The goal is to develop superior multifunctional properties compared with traditional MMCs with a view to using these composites in applications including wear resistance, electrical components and light weight structural parts in industries including aerospace, automotive and defence, amongst others. In this paper, a pressureless infiltration technique was used to produce IPCs by infiltrating molten aluminium alloys into a range of gel-cast ceramic Foams produced from alumina, mullite, and spinel. Processing conditions for different material systems were determined. The wear rates of the composites were measured under dry sliding conditions. The wear mechanism was investigated and the effects of the Foam Density and cell size on the wear properties were determined. It was found that the alumina or spinel reinforcement-based IPCs performed better than those based on mullite. It was also found that all the Foam-based IPCs were up to twice as wear resistant as MMCs made by infiltrating a bed of ceramic powder
-
microstructure and property characterisation of 3 3 al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Journal of Materials Science, 2010Co-Authors: Hong Chang, Rebecca L. Higginson, Jon G P BinnerAbstract:3-3 Interpenetrating composites, consisting of 3-dimensionally interpenetrating matrices of two different phases, are interesting materials with potentially superior properties when compared with traditional metal matrix composites. In the present research, gel-cast Al2O3 Foams with open porosity in the form of spherical cells connected by circular windows were pressurelessly infiltrated using an Al-8 wt% Mg alloy. Electron backscatter diffraction (EBSD) analysis revealed that the alloy had a large grain size with single grains generally inhabiting multiple cells. The flexural strength of the composites, tested using 3-point bending, was ~350 MPa, rather high when compared to other Al-alloy-based Al2O3 composites. The strength increased with both decreasing Foam Density and cell size. The reasons for the high strength are good metal–ceramic interfacial bonding, crack bridging by plastic deformation of the metal phase and crack deflection.
-
dry sliding wear behaviour of al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Wear, 2010Co-Authors: Hong Chang, Jon G P Binner, Rebecca L. HigginsonAbstract:Abstract Aluminium alloys, reinforced with ceramic particles or fibres, are desired materials in high performance applications due to their superior properties. In this paper, gel-cast Al 2 O 3 Foams were pressurelessly infiltrated using an Al–8 wt.% Mg alloy. The wear rates of the alloy and the Al(Mg)/Al 2 O 3 interpenetrating composites were tested under dry sliding conditions; effects of Al 2 O 3 Foam Density and cell size on the composite wear resistance under different loads and sliding distances were investigated. A ‘ploughing’ mechanism was observed in all the composites after an initial 250 m sliding distance, whilst the composites with the higher Foam Density show a ‘two-stage’ wear with sliding distance. The decrease in the wear rate in the second stage in the latter is attributed to an Al 2 O 3 network protruding out of the worn surface, which protects the direct wear of the Al(Mg) alloy by the counter ball. Within the range studied, a larger cell size is preferred for better wear resistance.
Jon G P Binner - One of the best experts on this subject based on the ideXlab platform.
-
dry sliding wear behaviour of co continuous ceramic Foam aluminium alloy interpenetrating composites produced by pressureless infiltration
Wear, 2012Co-Authors: Jing Liu, Jon G P Binner, Rebecca L. HigginsonAbstract:Abstract Metal–ceramic interpenetrating composites (IPCs) consist of 3D-continuous matrices of discrete metal and ceramic phases. The goal is to develop superior multifunctional properties compared with traditional MMCs with a view to using these composites in applications including wear resistance, electrical components and light weight structural parts in industries including aerospace, automotive and defence, amongst others. In this paper, a pressureless infiltration technique was used to produce IPCs by infiltrating molten aluminium alloys into a range of gel-cast ceramic Foams produced from alumina, mullite, and spinel. Processing conditions for different material systems were determined. The wear rates of the composites were measured under dry sliding conditions. The wear mechanism was investigated and the effects of the Foam Density and cell size on the wear properties were determined. It was found that the alumina or spinel reinforcement-based IPCs performed better than those based on mullite. It was also found that all the Foam-based IPCs were up to twice as wear resistant as MMCs made by infiltrating a bed of ceramic powder
-
microstructure and property characterisation of 3 3 al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Journal of Materials Science, 2010Co-Authors: Hong Chang, Rebecca L. Higginson, Jon G P BinnerAbstract:3-3 Interpenetrating composites, consisting of 3-dimensionally interpenetrating matrices of two different phases, are interesting materials with potentially superior properties when compared with traditional metal matrix composites. In the present research, gel-cast Al2O3 Foams with open porosity in the form of spherical cells connected by circular windows were pressurelessly infiltrated using an Al-8 wt% Mg alloy. Electron backscatter diffraction (EBSD) analysis revealed that the alloy had a large grain size with single grains generally inhabiting multiple cells. The flexural strength of the composites, tested using 3-point bending, was ~350 MPa, rather high when compared to other Al-alloy-based Al2O3 composites. The strength increased with both decreasing Foam Density and cell size. The reasons for the high strength are good metal–ceramic interfacial bonding, crack bridging by plastic deformation of the metal phase and crack deflection.
-
dry sliding wear behaviour of al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Wear, 2010Co-Authors: Hong Chang, Jon G P Binner, Rebecca L. HigginsonAbstract:Abstract Aluminium alloys, reinforced with ceramic particles or fibres, are desired materials in high performance applications due to their superior properties. In this paper, gel-cast Al 2 O 3 Foams were pressurelessly infiltrated using an Al–8 wt.% Mg alloy. The wear rates of the alloy and the Al(Mg)/Al 2 O 3 interpenetrating composites were tested under dry sliding conditions; effects of Al 2 O 3 Foam Density and cell size on the composite wear resistance under different loads and sliding distances were investigated. A ‘ploughing’ mechanism was observed in all the composites after an initial 250 m sliding distance, whilst the composites with the higher Foam Density show a ‘two-stage’ wear with sliding distance. The decrease in the wear rate in the second stage in the latter is attributed to an Al 2 O 3 network protruding out of the worn surface, which protects the direct wear of the Al(Mg) alloy by the counter ball. Within the range studied, a larger cell size is preferred for better wear resistance.
Hong Chang - One of the best experts on this subject based on the ideXlab platform.
-
microstructure and property characterisation of 3 3 al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Journal of Materials Science, 2010Co-Authors: Hong Chang, Rebecca L. Higginson, Jon G P BinnerAbstract:3-3 Interpenetrating composites, consisting of 3-dimensionally interpenetrating matrices of two different phases, are interesting materials with potentially superior properties when compared with traditional metal matrix composites. In the present research, gel-cast Al2O3 Foams with open porosity in the form of spherical cells connected by circular windows were pressurelessly infiltrated using an Al-8 wt% Mg alloy. Electron backscatter diffraction (EBSD) analysis revealed that the alloy had a large grain size with single grains generally inhabiting multiple cells. The flexural strength of the composites, tested using 3-point bending, was ~350 MPa, rather high when compared to other Al-alloy-based Al2O3 composites. The strength increased with both decreasing Foam Density and cell size. The reasons for the high strength are good metal–ceramic interfacial bonding, crack bridging by plastic deformation of the metal phase and crack deflection.
-
dry sliding wear behaviour of al mg al2o3 interpenetrating composites produced by a pressureless infiltration technique
Wear, 2010Co-Authors: Hong Chang, Jon G P Binner, Rebecca L. HigginsonAbstract:Abstract Aluminium alloys, reinforced with ceramic particles or fibres, are desired materials in high performance applications due to their superior properties. In this paper, gel-cast Al 2 O 3 Foams were pressurelessly infiltrated using an Al–8 wt.% Mg alloy. The wear rates of the alloy and the Al(Mg)/Al 2 O 3 interpenetrating composites were tested under dry sliding conditions; effects of Al 2 O 3 Foam Density and cell size on the composite wear resistance under different loads and sliding distances were investigated. A ‘ploughing’ mechanism was observed in all the composites after an initial 250 m sliding distance, whilst the composites with the higher Foam Density show a ‘two-stage’ wear with sliding distance. The decrease in the wear rate in the second stage in the latter is attributed to an Al 2 O 3 network protruding out of the worn surface, which protects the direct wear of the Al(Mg) alloy by the counter ball. Within the range studied, a larger cell size is preferred for better wear resistance.
Chul B Park - One of the best experts on this subject based on the ideXlab platform.
-
fabrication and characterization of closed cell rubber Foams based on natural rubber carbon black by one step Foam processing
Industrial & Engineering Chemistry Research, 2016Co-Authors: Ali Vahidifar, Saied Nouri Khorasani, Chul B Park, Hani E Naguib, Hossein Ali KhonakdarAbstract:A novel one-step compression molding was proposed and successfully employed for preparation of closed-cell Foams based on natural rubber (NR)/carbon black (CB) composite. The uniqueness of this new method was that both the Foam Density and expansion ratio became independent of the CB content. The rheometrical findings indicated that the increase in the CB content from 0 to 20 phr yielded a 0.91 and 3.51 N m increase in the initial and the final torque, respectively. The SEM results demonstrated that the prepared Foam had three different layers including the skin, transition, and core layers. Almost 14-fold enhancement of the cell Density (from 8 to 117 cells/cm3) was obtained by increasing the CB content in a constant Foam Density. Although, curing properties, cell morphology, and mechanical properties of the Foam improved by increasing the CB content, the gradual deterioration was observed for sound absorption properties.
-
effect of processing parameters on the mechanical properties of injection molded thermoplastic polyolefin tpo cellular Foams
Macromolecular Materials and Engineering, 2008Co-Authors: Steven Wong, Hani E Naguib, John W S Lee, Chul B ParkAbstract:In this study, the effects of processing parameters on the mechanical properties of injection molded thermoplastic polyolefin (TPO) Foams are investigated. Closed cell TPO Foams were prepared by injection molding process. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters on the injection molding machine. The Foam morphologies were characterized in terms of skin thickness, surface roughness, and relative Foam Density. Tensile properties and impact resistance of various injection molded TPO samples were correlated with various Foam morphologies. The findings show that the mechanical properties are significantly affected by Foam morphologies. The experimental results obtained from this study can be used to predict the microstructure and mechanical properties of cellular injection molded TPO Foams prepared with different processing parameters.
-
effect of processing parameters on the cellular morphology and mechanical properties of thermoplastic polyolefin tpo microcellular Foams
Advances in Polymer Technology, 2007Co-Authors: Steven Wong, Hani E Naguib, Chul B ParkAbstract:In this study, the effects of processing parameters on the cellular morphologies and mechanical properties of thermoplastic polyolefin (TPO) microcellular Foams are investigated. Microcellular closed cell TPO Foams were prepared using a two-stage batch process method. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters such as saturation pressure, Foaming temperature, and Foaming time. Foam morphologies were characterized in terms of the cell Density, Foam Density, and average cell size. Elastic modulus, tensile strength, and elongation at break of the Foamed TPO samples were measured for different cell morphologies. The findings show that the mechanical properties are significantly affected by the Foaming parameters that varied with the cell morphologies. The experimental results can be used to predict the microstructure and mechanical properties of microcellular polymeric TPO Foams prepared with different processing parameters. © 2008 Wiley Periodicals, Inc. Adv Polym Techn 26:232–246, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20104
-
effect of processing parameters on the cellular morphology and mechanical properties of thermoplastic polyolefin tpo microcellular Foams
ASME 2006 International Mechanical Engineering Congress and Exposition, 2006Co-Authors: Steven Wong, Hani E Naguib, Chul B ParkAbstract:In this study, the effects of processing parameters on the cellular morphologies and mechanical properties of TPO70 (Thermoplastic Polyolefin) microcellular Foams are investigated. Microcellular closed cell TPO70 Foams were prepared using a two-stage batch process method. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters such as saturation pressure, Foaming temperature and Foaming time. The Foam morphologies were characterized in terms of the cell Density, Foam Density and average cell size. Elastic modulus, tensile strength, and elongation at break of the Foamed TPO70 samples were measured for different cell morphologies. The findings show that the mechanical properties were significantly affected by the Foaming parameters which varied with the cell morphologies. The experimental results can be used to predict the microstructure and mechanical properties of microcellular polymeric TPO70 Foams prepared with different processing parameters.Copyright © 2006 by ASME
Hani E Naguib - One of the best experts on this subject based on the ideXlab platform.
-
fabrication and characterization of closed cell rubber Foams based on natural rubber carbon black by one step Foam processing
Industrial & Engineering Chemistry Research, 2016Co-Authors: Ali Vahidifar, Saied Nouri Khorasani, Chul B Park, Hani E Naguib, Hossein Ali KhonakdarAbstract:A novel one-step compression molding was proposed and successfully employed for preparation of closed-cell Foams based on natural rubber (NR)/carbon black (CB) composite. The uniqueness of this new method was that both the Foam Density and expansion ratio became independent of the CB content. The rheometrical findings indicated that the increase in the CB content from 0 to 20 phr yielded a 0.91 and 3.51 N m increase in the initial and the final torque, respectively. The SEM results demonstrated that the prepared Foam had three different layers including the skin, transition, and core layers. Almost 14-fold enhancement of the cell Density (from 8 to 117 cells/cm3) was obtained by increasing the CB content in a constant Foam Density. Although, curing properties, cell morphology, and mechanical properties of the Foam improved by increasing the CB content, the gradual deterioration was observed for sound absorption properties.
-
effect of processing parameters on the mechanical properties of injection molded thermoplastic polyolefin tpo cellular Foams
Macromolecular Materials and Engineering, 2008Co-Authors: Steven Wong, Hani E Naguib, John W S Lee, Chul B ParkAbstract:In this study, the effects of processing parameters on the mechanical properties of injection molded thermoplastic polyolefin (TPO) Foams are investigated. Closed cell TPO Foams were prepared by injection molding process. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters on the injection molding machine. The Foam morphologies were characterized in terms of skin thickness, surface roughness, and relative Foam Density. Tensile properties and impact resistance of various injection molded TPO samples were correlated with various Foam morphologies. The findings show that the mechanical properties are significantly affected by Foam morphologies. The experimental results obtained from this study can be used to predict the microstructure and mechanical properties of cellular injection molded TPO Foams prepared with different processing parameters.
-
effect of processing parameters on the cellular morphology and mechanical properties of thermoplastic polyolefin tpo microcellular Foams
Advances in Polymer Technology, 2007Co-Authors: Steven Wong, Hani E Naguib, Chul B ParkAbstract:In this study, the effects of processing parameters on the cellular morphologies and mechanical properties of thermoplastic polyolefin (TPO) microcellular Foams are investigated. Microcellular closed cell TPO Foams were prepared using a two-stage batch process method. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters such as saturation pressure, Foaming temperature, and Foaming time. Foam morphologies were characterized in terms of the cell Density, Foam Density, and average cell size. Elastic modulus, tensile strength, and elongation at break of the Foamed TPO samples were measured for different cell morphologies. The findings show that the mechanical properties are significantly affected by the Foaming parameters that varied with the cell morphologies. The experimental results can be used to predict the microstructure and mechanical properties of microcellular polymeric TPO Foams prepared with different processing parameters. © 2008 Wiley Periodicals, Inc. Adv Polym Techn 26:232–246, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20104
-
effect of processing parameters on the cellular morphology and mechanical properties of thermoplastic polyolefin tpo microcellular Foams
ASME 2006 International Mechanical Engineering Congress and Exposition, 2006Co-Authors: Steven Wong, Hani E Naguib, Chul B ParkAbstract:In this study, the effects of processing parameters on the cellular morphologies and mechanical properties of TPO70 (Thermoplastic Polyolefin) microcellular Foams are investigated. Microcellular closed cell TPO70 Foams were prepared using a two-stage batch process method. The microstructure of these Foamed samples was controlled by carefully altering the processing parameters such as saturation pressure, Foaming temperature and Foaming time. The Foam morphologies were characterized in terms of the cell Density, Foam Density and average cell size. Elastic modulus, tensile strength, and elongation at break of the Foamed TPO70 samples were measured for different cell morphologies. The findings show that the mechanical properties were significantly affected by the Foaming parameters which varied with the cell morphologies. The experimental results can be used to predict the microstructure and mechanical properties of microcellular polymeric TPO70 Foams prepared with different processing parameters.Copyright © 2006 by ASME