原位转化C_f/Al_2O_3陶瓷基复合材料的冲蚀磨损  

Erosive wear of in-situ transformed carbon fiber toughened alumina ceramic composites

作　　者：赵赋[1] 陈华辉[1] 任杰[1] 王纯阳[1] 马彪[1] 

机构地区：[1]中国矿业大学(北京)机电与信息工程学院,北京100083

出　　处：《工程科学学报》2016年第11期1596-1602,共7页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51275516)

摘　　要：采用真空热压烧结技术制备原位转化C_f/Al_2O_3复合材料,并在改装后的MSH型腐蚀磨损试验机上研究复合材料在不同冲蚀角度和速度下的浆体冲蚀磨损性能.通过对试样冲蚀表面的形貌观察和分析,探讨复合材料的冲蚀磨损机理以及纤维增韧对磨损过程的影响.试验结果表明:在大角度和较高速度的冲蚀条件下C_f/Al_2O_3表现出较好的耐磨损性能,其磨损机理主要为脆性材料受到反复冲击,表面产生脆性剥落.增韧纤维对冲蚀磨损性能的影响主要体现在材料产生裂纹后对基体的桥连作用和对冲击功的吸收,抑制裂纹扩展,减少材料损失.An in-situ transformed carbon fiber toughened alumina ceramic matrix composite was prepared by vacuum hot pressure sintering technology, and the slurry erosion wear behaviour of the composite was tested at different impact angles and velocities on a modified MSH tester. The wear mechanism of the composite and the toughening effect of carbon fiber in the wear process were also analyzed by observing its erosion surface morphology. The results show that Cf/A12O exhibits a better wear resistance under the condi- tions of a larger impact angle and a higher impact velocity. The slurry erosion wear mechanism of Cf/A12O3 is brittle spalling when the surface is repeatedly impacted. The effect of carbon fiber on the erosive wear is bridging the matrix and absorbing the impact energy after cracking. It can inhibit cracks from extending and reduce the loss of the composite.

关 键 词：陶瓷基复合材料 氧化铝陶瓷 碳纤维 浆体冲蚀 磨损机理 

分 类 号：TB332[一般工业技术—材料科学与工程]