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以钛丝网为反应源,以金属Al为基体,通过熔渗+原位反应法制备出一种Al3Ti金属间化合物颗粒增强铝基表面复合涂层。根据差热分析结果确定了反应温度为890℃;通过XRD、SEM以及显微硬度和磨损测试对所得到的复合涂层进行了表征。结果表明:当保温时间为20 min时,钛丝在铝基体中的反应较完全,原位合成为块状和条状的Al3Ti颗粒;颗粒的显微硬度大约为基体的4.5倍;在载荷为10 N的干滑动磨损条件下,相对于没有增强的Al基体而言,保温20 min所制备的复合涂层表现出较好的耐磨性,其磨损机制为粘着磨损和磨粒磨损共存。
A kind of Al3Ti intermetallic compound particle reinforced Al-based surface composite coating was prepared by melt infiltration + in situ reaction using titanium mesh as reaction source and Al as matrix. According to the results of differential thermal analysis, the reaction temperature was determined to be 890 ℃. The composite coating was characterized by XRD, SEM and microhardness and wear tests. The results show that when the holding time is 20 min, the reaction of titanium wire in aluminum matrix is more complete and in situ synthesized as bulk and strip Al3Ti particles; the microhardness of the particles is about 4.5 times that of the matrix; Under dry sliding wear conditions of 10 N, the composite coatings prepared by heat preservation for 20 min exhibited better wear resistance compared with the non-reinforced Al matrix. The wear mechanism of the composite coatings was adhesion and abrasive wear.