采用真空热压烧结技术制备原位转化Cf/Al2 O3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Cf/Al2 O3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/Al2 O 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/Al2 O3 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.
展开▼
