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采用真空消失模铸造技术,将钢液浸渗到表面化学气相沉积了金属镍涂层的氧化铝泡沫陶瓷中制备三维网络氧化铝/钢复合材料。研究复合材料的结构、抗弯强度及磨粒磨损性能。结果表明,镍涂层可使钢液有效浸渗到陶瓷骨架中,成功制备出界面结合良好的三维网络氧化铝/钢复合材料。复合材料中陶瓷/钢界面为非反应型界面,断裂过程中,裂纹沿界面扩展,复合材料的抗弯强度随陶瓷相体积分数的增加而降低。复合材料的磨损机制为以钢被切削、陶瓷断裂–脱落为特征。随陶瓷相体积分数的增加,复合材料的体积磨损量降低。
Using vacuum foam casting technology, the molten steel was infiltrated into alumina foam ceramic coated with nickel metal on the surface by chemical vapor deposition to prepare three-dimensional network alumina / steel composites. The structure, flexural strength and abrasive wear properties of the composites were studied. The results show that the nickel coating can effectively infiltrate the molten steel into the ceramic framework and successfully prepare a three-dimensional network alumina / steel composite material with good interfacial adhesion. The ceramic / steel interface in the composite is a non-reactive interface, and the crack propagates along the interface during the fracture process. The flexural strength of the composite decreases with the increase of the ceramic volume fraction. The wear mechanism of the composite material is that the steel is cut and the ceramic is broken-off. With the increase of ceramic phase volume fraction, the volume loss of composite decreases.