涂覆颗粒增强耐热铝基复合材料的力学及摩擦磨损性能

Mechanical properties and tribology of coating particulates reinforced alumna matrix composites

研究了经真空热压、热挤压工艺制备的涂覆颗粒(化学涂层工艺)增强Al-Fe-V-Si耐热铝合金基复合材料在不同温度下的力学性能与摩擦磨损性能.实验结果表明:涤覆后的SiC_p与基体结合更加牢固,涂覆层(Ni)的加入降低了材料内部颗粒(SiC_p)与基体(Al-Fe-V-Si)之间的孔隙,10％SiC(Ni)/Al-Fe-V-Si(0812)复合材料在室温的断裂强度分别比基体和10％SiC_p/Al-Fe-V-Si(0812)复合材料增加了62.15％和2.82％,在400℃时分别增加了55.3％和28.6％.复合材料耐磨性能比增强体未涂覆复合材料大大提高,在载荷50N,转速0.63 m/s的工况下,经增强体涂覆的铝基复合材料在300℃时为以磨粒磨损为主的磨损机制;高于350℃时,为以粘着磨损为主的磨损机制.

With the process of a new powder chemical coating (replacement reaction method) to produce Nick-el-coated SiC particulates, 10% SiC (Ni)/Al-Fe-V-Si (mass fraction) composites was produced by vacuunpressing, hot extrusion. The result show that the strength of 10% SiC (Ni)/Al-Fe-V-Si (0812) compositesare 62. 15% and 2. 82% more than 10%SiC_p/AL-Fe-V-Si (0812) composites and the matrix Al-Fe-V-Si(0812) alloy in ambient temperature, and 55. 3% and 28. 6% at 400 ℃ respectively. The wear proper-ties mechanism of 10% SiC (Ni)/Al-Fe-V-Si composites at different temperature were studied. The re-sults show that because of the coating particulates the wear from of the materials is normal below 300 ℃and abnormal above 350 ℃ at loads of 50 N, wear velocity of 0. 63 m/min. The wear stabilities of thecomposites are improved by the coating of Ni to the Particulates and are higher than that of no coatings.