摘要
用真空热压工艺制备了Al2O3-SiC复相陶瓷。对热压烧结的纯Al2O3以及Al2O3-SiC复相陶瓷进行了摩擦磨损实验,研究了SiC添加量对复相陶瓷摩擦磨损性能的影响。结果表明:在压力为25MPa,1635℃热压烧结1h,当SiC的质量含量为5%时,Al2O3-SiC复相陶瓷的耐磨性最佳,虽摩擦系数最大(0.61,Al2O3则为0.46),但磨损率(WR)仅为5×10-4mm3/(N·m)。Al2O3-SiC复合材料的磨损机理为脆性断裂引起的磨粒磨损,材料的WR与断裂韧性(KIc)和Vickers硬度(HV)的乘积(KIc1/2HV5/8)成反比。
Al2O3 and Al2O3-SiC composite ceramics were fabricated by hot pressing in vacuum, and their friction and wear properties were measured. The effects of the SiC addition on the friction and wear properties of the composites were investigated. The results show that the Al2O3-SiC composite with 5% in mass SiC hot-pressed at 25 MPa, 1 635 ℃ for I h has the best wear resistance, with a minimum wear rate （WR） of 5×10^-4mm^3/（N·m） although its friction coefficient is the maximum （0.61; the friction coefficient of Al2O3 is 0.46）. The wear mechanism of Al2O3-SiC composites is grain abrasion caused by brittle fracture, and the wear rate is inversely proportional to the product of fracture toughness and Vickers hardness （KIc^1/2Hv^5/8）.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第5期778-782,共5页
Journal of The Chinese Ceramic Society
关键词
氧化铝-碳化硅复相陶瓷
磨损率
断裂韧性
alumina-silicon carbide composite ceramics
wear rate
fracture toughness
