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以碳粒、片状石墨和陶瓷粒子为分散材料,用离心铸造方法制取了Al-11%Si铝合金复合铸件,并检测了其耐磨性和耐冲击性。所得结果如下: 1.当分散粒子和合金溶液不湿润时,添加氧化性陶瓷或金属粒子,能形成最理想的铸件表面复合层。2.如果放在铸型中的分散材料与基体金属的相对位置不变,那么分散层的厚度,基本上取决于铸造温度和重力倍数G值。3.分散层厚度为0.75mm的复合铸件,其冲击性约比基体合金AC3A的冲击性降低一半。4.含WA700粒子的复合铸件,其耐磨性比AC3A原始铸件约提高三倍。
Al-11% Si aluminum alloy composite castings were prepared by centrifugal casting from carbon, flake graphite and ceramic particles. The wear resistance and impact resistance were also tested. The results are as follows: 1. When the dispersed particles and alloy solution is not wetting, adding oxide ceramic or metal particles, can form the ideal casting surface composite layer. 2. If the relative position of the dispersed material to the base metal in the mold remains the same, then the thickness of the dispersed layer depends essentially on the casting temperature and the value of the G multiple. 3. Dispersed layer thickness of 0.75mm composite castings, its impact resistance than the base alloy AC3A impact decreased by half. 4. WA700 particles containing the composite castings, the abrasion resistance than AC3A original castings increased about three times.