摘要
采用极性分散剂和超声分散技术 ,在微米Si3 N4基体中加入SiC纳米颗粒 ,用真空热压烧结法制备出Si3 N4/SiC(N)纳米复相陶瓷。研究结果表明 :加入SiC纳米颗粒可显著降低烧结温度 ,阻止 β Si3 N4晶粒的过度生长 ,细化晶粒组织 ,提高复合陶瓷材料的致密度和机械性能 ;含 15wt%SiC纳米颗粒的复相陶瓷具有最佳断裂韧度和较高抗弯强度 ,可作为高速切削刀具和模具的候选材料。
The polarity dispersant, ultrasonic disperse and vacuum-sintering technology are applied to prepare the Si 3N 4/SiC(N) multi-phase nano-ceramics by adding the nano-sized SiC particles to the Si 3N 4 basal material. The investigation results show that with the addition of nano-sized SiC particles, the sintering temperature is decreased greatly and the overgrowth of β -Si 3N 4 grains is prohibited and grain structure is refined, so that the density and mechanical properties of the composite ceramics are improved. The Si 3N 4/SiC(N) multi-phase ceramics added 15wt% nano-sized SiC have the best fracture toughness and improved bend strength, so can be used as a candidate for high-speed cutting tool and die materials.
出处
《工具技术》
北大核心
2003年第4期3-6,共4页
Tool Engineering
基金
航空高校自选课题资助项目
关键词
复相陶瓷
纳米颗粒
氮化硅
碳化硅
制备
性能
multi-phases ceramics, nano-sized particle, Si 3N 4, SiC, preparation, performance
