铝硅合金-石墨复合材料的制备及阻尼性能

PREPARATION AND DAMPING PROPERTIES OF ALUMINIUN ALLOY COMPOSITES CONTAINING GRAPHITE PARTICLES

在Ａｌ－７．５％Ｓｉ合金两相温度范围区加入石墨颗粒，搅拌，制备了石墨－铝硅复合材料。结果表明，在５８０～５９０℃搅拌１０～１５ｍｉｎ，石墨能均匀地分布于Ａｌ－７．５％Ｓｉ合金基体。性能测试表明，该复合材料力学性能略低于基体铝硅合金，但是具有高得多的阻尼性能。加入低于１８％（体积百分数）的石墨，复合材料有较好的综合性能，内耗最高可达３．５×１０－２，是一种阻尼性能优越的铸造材料。

Al-7.5wt%Si alloy composites containing graphite particles are prepared by melt cast technology. The MET shows that the graphite particles are distributed homogenously in aluminium alloy matrix after mixed for 10～15 minutes in temperature range of 580℃～590℃. The results of property test show that the composites have good multiple properties with internal friction value of 3.5×10 -2 and are the ideal high damping casting materials.