摘要
采用新的工艺方法制得三种不同的粒子增强复合材料,即在Al-1.8Si-0.4Mg-0.36Cu合金液中加入外加粒子,经搅拌喷氮气快速冷却获得颗粒为0.3～1.0mm的预制料,再经筛选、配料、预压块和热压(620℃压力为20MPa保压2～5分钟)制得含6％SiC、4％SiC_+2％石墨等三种铝基复合材料。这三种复合材料中外加粒子分布均匀,与基体结合良好,其磨损性能以加入6％SiC最佳,4％SiC+2％石墨次之,4％石墨最差。三种复合材料的磨损损伤的主要方式是粘着磨损。
In the present study, a new technique has been developed for manufacturing the grainular composite. The process of the manufacture is as follows: firstly, the SiC particles (3~6um) or graphite are put into melten aluminium alloy (Al-1.8Si-0.4Mg-0.36 Cu); then, the melten alloy containing the SiC or graphite grains is stired and quickly cooled to obtain the prefabncated subsance in the states of grains of 0.3~ 1.0mm diameter containing a few particles of SiC or graphite, or both; finally, the prefabricated substance of three kinds are, respectively, sifted and pressed at 620C and 20 MPa pressure for 2~ 5 minutes to form the grainular composite. The whole process is protected from the oxidization of aluminium by using nitrogen. The observation under optical microscope and SEM shows that the particles of SiC or graphite are distributed homogeneously in the alloy matrix and banded well with the matrix. The composite reinforced by SiC grains has the best wearing resistance but the composite reinforced by graphite has the worst wearing resistance. The wear mechanism operated in the abovementioned composites are mainly adhesive.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1991年第4期32-35,共4页
Journal of Materials Engineering
