压力对振荡热压烧结碳化硼陶瓷的影响

Effect of Pressure on the Hot Oscillating Pressing Sintered Boron Carbide Ceramics

针对碳化硼陶瓷难以致密的缺点以及振荡热压烧结可以有效改善陶瓷材料的微观结构这一事实,采用振荡热压烧结的方法来制备碳化硼陶瓷。研究了不同压力中值对振荡热压烧结碳化硼陶瓷的微观结构和力学性能的影响及规律。结果表明,随着振荡压力的不断提高,碳化硼陶瓷的相对密度逐渐增大,当振荡压力为50±10 MPa时即接近完全致密,同时其硬度和断裂韧性也逐渐提高。当振荡压力为70±10 MPa时分别达到39.43 GPa和4.96 MPa·m^(1/2),对制备高性能碳化硼陶瓷提供了一定数值参考。

In view of the disadvantage that the boron carbide ceramics are difficult to densify and the fact that hot oscillating pressing sintering can effectively improve the microstructure of ceramic materials,the method of hot oscillating pressing sintering is used to prepare the boron carbide ceramics.In this paper,effects and laws of different median pressures on the microstructure and mechanical properties of oscillating hot-pressing sintered boron carbide ceramics are studied.The results show that the relative density of boron carbide ceramics increases gradually with the continuous increase of the oscillating pressure.When the oscillating pressure is 50±10 MPa,it is nearly completely dense,and its hardness and fracture toughness also increase gradually;while when the oscillating pressure is 70±10 MPa,it reaches 39.43 GPa and 4.96 MPa·m^(1/2) respectively,which provides a certain numerical reference for the preparation of high-performance boron carbide ceramics.