气压烧结Al_2O_3/TiCN复合材料的力学性能与显微结构  

Mechanical properties and microstructure of Al_2O_3/TiCN composite by gas pressure sintering

作　　者：杨海涛[1] 尚福亮[2] 高玲[1] 

机构地区：[1]深圳大学深圳特种功能材料实验室理学院材料系,广东深圳518060 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《功能材料》2006年第11期1784-1786,共3页Journal of Functional Materials

基　　金：教育部科学技术研究重点(02049)国家基金重大国际合作子项资助项目(50220160657)

摘　　要：运用二步气压烧结工艺成功制备了Al_2O_3- 30%(质量分数)TiCN复合材料。材料的相对密度达到99．5%,抗折强度为772MPa．硬度为19．6GPa,断裂韧性高达5．82MPa/m^2。该材料的烧结过程为固相烧结,烧结过程中TiCN颗粒几乎没有长大,而Al_2O_3颗粒则长大为原来3倍左右。材料在冷却过程中由于Al_2O_3和TiCN的热力学性能的失配而引起的界面微应力增长到50MPa左右,不会在材料中导致晶界开裂,但却足以使晶粒发生位错,从而使材料的性能得以增强。Al2O3 - 30wt%TiCN composites have been fabricated successfully by two-stage gas pressure sintering schedule. The gas pressure sintered Al2O3 - 30wt%TiCN composite achieved a relative density of 99.5%, a bending strength of 772MPa, a hardness of 19.6GPa, and a fracture toughness of 5.82MPa/m^2. It is a solid state sintering of two phases without solubility for Al2O3 -TiCN composite. Little grain growth occurred for TiCN during sintering while Al2O3 grains grew about 3 times. The interface microstress arising during cooling from the processing temperature because of the thermal and/or mechanical properties mismatch between the Al2O3 and TiCN phase is about 50MPa. Such a compressive microstress is not high enough to cause grain boundary cracking that may weaken the composite but to introduce dislocations within grains, which is very good to enhance the composites.

关 键 词：AL2O3 气压烧结 力学性能 显微结构 

分 类 号：TQ174.1[化学工程—陶瓷工业]