烧结助剂对碳化硼陶瓷性能的影响

INFLUENCE OF THE SINTERED CATALYST ON THE PORPERTIES OF BORON CARBIDE

以氧化铝、活性碳为烧结助剂,以碳化硼为基体、采用真空热压烧结技术制备碳化硼陶瓷。研究成分配比、烧结工艺对烧结体致密度及力学性能的影响;探讨了添加剂碳化硼陶瓷的烧结机理。结果表明,以氧化铝、活性碳为烧结助剂,采用真空热压烧结工艺,制备出碳化硼陶瓷;碳化硼烧结的最佳材料配方与烧结工艺:B4C:Al2O3:C=70:15:15,烧结温度1930℃,压力20MPa,保温时间1h;所得碳化硼烧结体性能:开口气孔率1.49%,相对密度为90.33%,抗弯强度为144.27MPa,硬度(HRA)95。

In this paper using the vacuum hot-pressed sintered technology boron carbide ceramics is prepared with the sintered catalyst of Al2O3 and C. At the same time, the effect of ratio of component and sintered techniques on the sintered density and mechanical properties is studied. In addition mechanism of sintering is discussed when adding different sintered catalysts in boron carbide. The results show that the boron carbide ceramics is prepared successfully by using the vacuum hot-pressed sintered technology and adding the sintered catalyst of Al2O3 and C; The finally mechanical properties of sintered body is that the rate of pore , relative density, bending structure and rigidity（HRA） is respectively 1.49% , 90.33% , 144.27MPa and 95 under the optimum sintered techniques which the ratio of component the sintered temperature, hot-pressure and the heat preservation time are respectively B4C：Al2O3：C =70：15：15, 1930℃, 20MPa, 1h.