SiC颗粒弥散强韧化Si3N4陶瓷刀具材料

Study of SiC Particle Reinforced and Toughened SiliconNitrideBase Ceramic CuttingTool Material

摘要:

对ＳｉＣ颗粒弥散强度韧化氮化硅陶瓷刀具材料的组成，结构及性能进行了研究，结果表明，ＳｉＣ颗粒的加入使材料的温度，韧性及硬度匀比纯Ｓｉ３Ｎ４陶瓷有显著提高，通过对其显微结构的分析，发现ＳｉＣ颗粒的加入使材料的显微结构明显改善能有效地阻止β－Ｓｉ３Ｎ４晶粒的异常生长，有利于形成的均匀细小的组织结构，同时，对ＳｉＣ颗粒在Ｓｉ３Ｎ４基体中的增韧机理进行了探讨。

Abstract:

The microstructure and properties of a SiC particle reinforced and toughened siliconnitridebase matrix ceramic cuttingtool material have been investigated.The results show that this material has excellent mechanical properties.By adding the SiC particles,strength,toughness and hardness can be greatly improved,as compared with those of the pure siliconnitride ceramic.Microstructural analysis shows that the SiC particles prevents the grain growth of Si\-3N\-4,and also improves the microstructure of Si\-3N\-4base ceramic.The toughening mechanism of SiC in the Si\-3N\-4 matrix is also discussed.