新型复相陶瓷刀具材料JX－2－Ⅰ的界面结构及其对材料性能的影响

Interfacial Microstructure of Advanced Composite Ceramic Tool Material JX-2-Ⅰand Its Effect on Mechanical Properties

本文利用ＴＥＭ研究了新型复相陶瓷刀具材料Ｊｘ－２－Ⅰ的界面结构，结果表明，在Ｊｘ－２－Ⅰ中Ａｌ＿２Ｏ＿３／ＳｉＣｗ（氧化铝／碳化硅晶须）界面和Ａｌ＿２Ｏ＿３／ＳｉＣｐ（碳化硅颗粒）界面结合良好，形成了具有较高强度的微观结构；发现在ＳｉＣｗ、ＳｉＣｐ和Ａｌ＿２Ｏ＿３晶粒上均有位错产生，在ＳｉＣｐ和Ａｌ＿２Ｏ＿３上有孪晶产生；分析表明，位错和孪晶的产生均吸收大量的断裂能，提高材料的断裂韧性，改善ＪＸ－２－Ⅰ材料的整体性能。

The interfacial microstructure of advanced composite ceramic tool material JX-2-Ⅰhas been studied withTEM, It shows that the tool material JX-2-Ⅰ has good interfacial bonding status of Al_O_3/SiCw orAl_2O_3/SiCp. The microstructure characterised by high strength are formed in JX-2-Ⅰ,It is found that there area lot of dislocations and twins generated in JX-2-Ⅰ. The process of dislocation or twin generation dissipatesmuch fracture energy and increases the fracture toughness of tool material.The mechanical properties of JX-2-Ⅰare improved also.