涂覆颗粒增强耐热铝基复合材料的性能  

Mechanical properties of coating particulates reinforced aluminium alloy matrix composites

作　　者：李云平[1] 李溪滨[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南工业大学学报》2001年第6期612-616,共5页Journal of Central South University of Technology(Natural Science)

基　　金：国家"九五"科技攻关项目 ( 95 YS 0 10 )

摘　　要：通过真空热压、热挤压工艺制备了涂覆颗粒增强Al Fe V Si耐热铝合金基复合材料 ,研究了该材料在不同温度下的力学性能与摩擦磨损性能 ,并与基体Al Fe V Si和未涂覆颗粒 (SiCp)增强Al Fe V Si的性能进行了对比 .研究结果表明 :涂覆后的SiCp 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 (SiCp)与基体 (Al Fe V Si)之间的孔隙 ;在室温 ,10 %SiC(Ni) Al Fe V Si(0 812 )复合材料的断裂强度分别比基体和复合材料 10 %SiCp Al Fe V Si(0 812 )增加了 6 2 .15 %和 2 .82 % ,在 40 0℃时分别增加了 5 5 .30 %和 2 8.6 0 % ;复合材料耐磨性能与增强体未涂覆复合材料的相比大大提高 ,经增强体涂覆的铝基复合材料试样在载荷为 5 0N、滑动速度为 0 .6 3m s的工况下 ,复合材料磨损机制在 30 0℃时以磨粒磨损为主 ,高于 35 0℃时 ,以粘着磨损为主 .In the process where a new powder chemical coating is used to produce nickel coated SiC particulates, 10%SiC(Ni)/Al Fe V Si composites is produced by vacuum pressing, hot extrusion. The results show that the strength of 10%SiC(Ni)/Al Fe V Si(0812) composites is 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 at ambient temperature, and it is 55.3% and 28.6% at 400 ℃ respectively. The wear properties and mechanism of 10%SiC(Ni)/Al Fe V Si composites at different temperatures have been studied. The results show that because of the coating particulates the wear form of the materials is normal below 300 ℃ and abnormal above 350 ℃ at loads 50 N, wear velocity 0.63 m/min. The wear stability of the composites were improved by the coating of Ni to the particulates and are higher than that without coatings.

关 键 词：涂覆粉沫 热挤压 耐热铝基复合材料 化学涂层法 耐磨性能 

分 类 号：TB333[一般工业技术—材料科学与工程]