汽车发动机用AZ91合金表面喷涂与性能研究  

Plasma Spraying and Properties on the Surface of AZ91 Alloy for Automotive Engine

作　　者：曾晓彤[1,2] 

机构地区：[1]襄阳汽车职业技术学院汽车运用学院,湖北襄阳441021 [2]华中师范大学物理与材料学院,湖北武汉430079

出　　处：《铸造技术》2018年第1期198-201,共4页Foundry Technology

摘　　要：采用等离子喷涂和激光重熔法在汽车发动机用AZ91合金表面制备了不同涂层,对比研究了涂层表面和横截面形貌、物相组成、显微硬度和电化学性能。结果表明,等离子喷涂层物相为:γ-Ni、FeNi_3、Ni_3B、WC、W_2C和Cr_7B_3,激光重熔层物相为γ-Ni、CrB、Ni_4B_3、WC、Cr_(23_B6和Cr_2B_3;显微硬度由高到低依次为:激光重熔层>等离子喷涂层>Ni/Al过渡层>AZ91合金基材;等离子喷涂层和激光重熔层的耐腐蚀性能均高于AZ91合金基材,且激光重熔层的耐腐蚀性高于等离子喷涂层。The different coating on the surface AZ91 alloy for automobile engine were prepared with plasma spraying and laser remelting process, and the cross-section morphology, phase composition, microhardness and electrochemical performance were investigated. The results show that the plasma spray coating phases are compose of gamma Ni, FeNi3, Ni3B, WC, W2C and Cr7B3, and the laser remelting layer phases are gamma Ni, CrB, Ni4B3, WC, Cr23B6 and Cr2B3. The Microhardness from high to low in turn is the laser remelting layer, plasma spraying layer, Ni/A1 transition layer and AZ91 alloy. Plasma spraying and laser remelting layer corrosion resistance are higher than the AZ91 alloy, and the corrosion resistance of laser remelting layer above the plasma spray coating.

关 键 词：汽车发动机 AZ91合金 表面喷涂 涂层 性能 

分 类 号：TG174[金属学及工艺—金属表面处理]