The scope of the research work is the production and characterization of Al matrix composites reinforced with WC ceramic nanoparticles. The synthesis process was powder metallurgy. The produced composites were examined as far as their microstructure and mechanical properties (resistance to wear, micro/macrohardness). Intermetallic phases (Al 12 W and Al 2 Cu) were identified in the microstrucutre. Al 4 C 3 was not detected in the composites. Adding more than 5 wt% WC to the aluminum, microhardness and wear resistance exceed the values of Al alloy. Composites having weak interface bond performed the highest wear rate.
The authors have investigated the influence of sintering time at 1600 °C on microstructure, shrinkage, density, surface hardness and bending strength of Al2O3 based ceramic composites. From the ceramic powder mixes, the specimens were compacted by uniaxial pressing and during sintering the heating gradient was 100 °C/h. The experiments have shown that at 1600°C of sintering temperature, the specimen densifications have almost finished within 5 hours, meanwhile the crystal grows processes were continued for up to 9 hours of sintering. The authors have found that the maximum values of hardness and mechanical bending strength of specimens were obtained at 5 hours of sintering and these values have slowly decreased with increasing the sintering times.
On the basis of several years experiments in investigation of hetero-modulus material structures and using natural biomaterials and high purity quartz powders the authors successfully developed new high porosity low density SiC ceramic cellulars and foams. For the development of new silicon-carbide and carbon-silicon-carbide (C/SiC) cellular ceramic composites and foams the author used high purity SiO2 powders mined in Fehervarcsurgo (Hungary) and a biomaterial reagents made from renewable vegetable under trade-name IG-R1. These low density high porosity silicon-carbides probably can be successfully applied in development of light weight ceramic reinforced metal alloy composites in the future. The structure and X-ray diffraction (XRD) analysis of used raw materials and the achieved by authors new SiC and C/SiC ceramic composites and foams are described and shown in present work.
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