100 Nm BaTiO3 Powders with the Content of 0, 0.5, 1, 5, 10 and 20% were Added into 1μm Al2O3 Powders, Dense Al2O3-Based Composites with Dispersed BaTiO3 Particulates were Fabricated by Conventional Pressure-Less Sintering at 1500°C. the Results Showed that there is a Non-Linear Relationship between the Addition Content of Fine-Grained Particles and the Flexural Strength of Al2O3 Ceramic. when the Content of Doping BaTiO3 Powders Reached around 5 % (mol), the Maximum Vickers Hardness of 137 and the Highest Break Strength of 269MPa were Achieved. Moreover, the Stress-Strain Curves have the same Characteristics of Ceramics.
Cu-based metal matrix, Ti coated and uncoated diamond composite were prepared by hot-press sintering in vacuum. The effects of the mixing time and the sintering temperature on the relative density, hardness and transverse rupture strength (TRS) of the matrix were studied. Structures of specimens sintered at different temperatures were studied by XRD. The TRS and wear resistant of coated and uncoated diamond segment were compared. The results show that the optimum mixing time is 20 hours; with the increase of sintering temperature, the relative density, hardness and TRS of the matrix firstly increase and then decrease; the TRS of diamond segment is lower than the matrix sintered at the same temperature and TRS of Ti coated diamond segment increased by 6.18% as compared with uncoated diamond segment; moreover the wear resistance of Ti coated diamond segment is better than that of uncoated diamond segment.
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