摘要
采用不同SiC颗粒级配(粒径为11.3μm与3.8μm SiC粒子的质量比分别为0.75∶1,0.5∶1,0.4∶1)用注浆成型反应烧结法制备了SiC陶瓷,在不同冲蚀角度下采用不同粒径(300～600μm和600～850μm)的石英砂进行冲蚀磨损试验,结合冲蚀表面形貌分析了颗粒级配对SiC陶瓷冲蚀磨损性能与机理的影响。结果表明:颗粒级配为0.75∶1的注浆素坯反应烧结制备SiC陶瓷的致密度最高,在相同冲蚀角度下的冲蚀磨损率最低;SiC陶瓷冲蚀磨损率随冲蚀角度的增大而先增大后减小,并在冲击角为60°时达到最大;石英砂粒径越大,磨损率越大;SiC陶瓷的冲蚀磨损机理以游离硅、游离碳和SiC粒子的脱落为主。
SiC ceramics were prepared by different SiC particle gradations （the mass ratio of SiC particles diameter of 11.3°m to 3.8 μm were 0. 75 ： 1,0. 5 .＂ 1,0. 4 .＂ 1） slip casting and reaction-sintering menthod, and then erosion wear testing was performed with different quartz abrasive particles of 300--600 vm and 600--850μm at different impact angles. Combining with the worn surface morphology to analyse the effect of particle gradation on erosion wear performance and mechanism. The results show that the SiC ceramic prepared by reaction-sintering slip casting green body with particle gradation of 0. 75 1 had the highest density, and its erosion wear rate was the lowest at the same impact angle. The erosion wear rate of SiC ceramic first increased and then decreased with the increase of impact angle and up to the maximum at impact angle of 60°. The bigger the quartz abrasive particle size, the more the erosion wear rate. The erosion wear mechanism was dominated by spalling of free silicon, free carbon and SiC particles.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第11期77-81,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(U1034003)
西安交通大学金属材料强度国家重点实验室开放研究项目资助(20121207)
陕西省重点学科建设专项资金资助项目
关键词
颗粒级配
注浆成型
碳化硅陶瓷
反应烧结
冲蚀磨损
particle gradation slip casting SiC ceramic reaction-sintering erosion wear
