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Al 合金-Al_2O_3陶瓷粒子铸造复合材料是由硬质 Al_2O_3粒子在 Al 合金基体上均匀分散而构成.这种复合材料既有较高的硬度又有良好的塑性.尤其是与铝合金相比,其耐磨性有成倍提高.因而,这种材料可望用作耐磨、制动、防弹及遮蔽材料.由于 Al 合金液与 Al_3O_3陶瓷粒子的润湿性很差,两者的比重也有较大差异,因此Al_2O_3粒子在 Al 合金液中受到很大斥力,极易聚合沉降.改善 Al_2O_3粒子与金属液润湿性的措施通常有下列四个方面:(1)颗粒表面包覆金属;(2)向金属液中加入合金元素;(3)粒子预处理;(4)超声波振动熔体。至于制备工艺,常见的有下列三种:(1)喷入法.利用喷枪,以惰性气体作载体,将粒
Al-Al_2O_3 ceramic particles cast composite is composed of hard Al 2 O 3 particles dispersed uniformly on the Al alloy matrix, which has both high hardness and good plasticity, especially compared with aluminum alloys Therefore, this material is expected to be used as wear-resistant, brake, bullet-proof and shielding materials.Because Al alloy liquid and Al 3 O 3 ceramic particles have poor wettability, the proportion of the two is also larger Al 2 O 3 particles are greatly repulsive in the Al alloy liquid and easily polymerize and settle.The measures to improve the wettability of the Al 2 O 3 particles and the metal liquid generally have the following four aspects: (1) the surface of the particles is coated with metal; (2) Adding alloying elements to the molten metal; (3) particle pretreatment; (4) ultrasonic vibration melt. As for the preparation process, the following three common: (1) injection method. Using a spray gun, with inert gas as a carrier, the particles