纳米氮化硼含量对Ti（C，N）基金属陶瓷组织和性能的影响

摘要

Ti（C, N）-based cermets reinforced by nano-BN particles were prepared by a microwave sintering technology under N2 gas atmosphere. Effect of different content of nano-BN on transverse rupture strength（TRS） and hardness of the cermet was studied. Microstructure of this material was analyzed by SEM with BSE. Result shows the addition of nano-BN particles has obvious strengthening effect on the property of this cermet. The ttransverse rupture strength and hardness of the cermet are improved to about 21.6% and 1.6%, respectively, when the content of nano-BN particles is 1.5% in weight. The addition of nano-BN particles baffles the dissolution of Ti（ C, N） . The micrograph on fracture surface of this cermet shows a cleavage fracture.%在氮气环境下，采用微波烧结技术制备氮化硼纳米粒子增强B（C，N）基金属陶瓷，采用SEM观察了其显微组织，并考察了BN含量对材料力学性能的影响．研究表明：纳米氮化硼对Ti（C，N）基金属陶瓷具有明显强化作用，添加1.5％纳米氮化硼时，复合材料的力学性能最佳，抗弯强度（TRS）提高了21．6％，硬度（HRA）提高了1．6％．纳米氮化硼的加入，阻碍了Ti（C，N）颗粒的溶解，金属陶瓷的断口形貌表现为穿晶断裂．