【摘要】 运用二步气压烧结工艺成功制备了Al₂O₃- 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/m²。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Al₂O₃颗粒则长大为原来3倍左右。材料在冷却过程中由于Al₂O₃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。更多还原

【Abstract】 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 ben- ding strength of 772MPa,a hardness of 19.6GPa,and a fracture toughness of 5.82MPa/m².It is a solid state sintering of two phases without solubility forAl₂O₃-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 en- hance the composites.更多还原