纳米氮化硅含量对碳氮化钛基金属陶瓷组织和性能的影响
Effects of Nano-Si3N4 Particle Content on Microstructure and Mechanical Properties of Ti(C,N)-based Cermet
易继勇1, 张厚安2, 古思勇2
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作者单位：(1. 湖南科技大学 机电工程学院, 湖南 湘潭 411201; 2. 厦门理工学院 材料制备与应用技术研究所, 福建 厦门361024)
中文关键字：金属陶瓷； 微波烧结； 纳米氮化硅； 微观结构
英文关键字：cermet; microwave sintering; nano-Si3N4; microstructure
中文摘要：在氩气环境下采用微波烧结技术制备了纳米Si3N4增强Ti(C，N)基金属陶瓷，考察了纳米Si3N4含量对材料力学性能的影响，利用SEM(BSE)观察了其显微组织。研究表明：纳米氮化硅对Ti(C，N)基金属陶瓷具有明显的强化作用。添加1.0%纳米Si3N4时，复合材料的力学性能最佳，抗弯强度提高了25.7%，硬度提高了2.0%。这是由于纳米氮化硅的加入促进了Ti(C, N)硬质相的溶解，细化了黑芯和晶粒，形成了较多的白芯-灰壳结构。
英文摘要：Ti(C,N)-based cermets reinforced by nano-Si3N4 particle were prepared by microwave sintering in argon gas atmosphere. The effects of nano-Si3N4 content on the transverse rupture strength (TRS) and hardness of the cermet were studied. The microstructure of this material was analyzed by SEM with BSE. The results show that the addition of nano-Si3N4 particle has important effects on the property of the cermet. The hardness and transverse rupture strength of the cermet improves by 2.0%, 25.7%, respectively, when the content of nano-Si3N4 particles is 1.0wt%. It can be attributed to the addition of nano-Si3N4 particles promoting the dissolution of Ti(C, N), which leads to the finer black-core and grain, and form more microstructure with “white core-gray rim” in this cermet than others.