铝合金发动机缸盖的再制造技术研究  

Research on Remanufacturing Process of a Typical Aluminum Alloy Engine Cylinder Head

作　　者：陈永雄[1] 魏世丞[1] 梁秀兵[2] 董世运[1] 徐滨士[1] 

机构地区：[1]装甲兵工程学院再制造技术重点实验室,北京100072 [2]装甲兵工程学院科研部,北京100072

出　　处：《材料工程》2012年第6期16-20,共5页Journal of Materials Engineering

基　　金：国家自然科学基金(51105377);国家973项目(2011CB013403)

摘　　要：针对废旧汽车铝合金发动机缸盖的再制造需求,对发动机缸盖进行了失效分析,并研究了高速电弧喷涂Al-RE涂层的再制造工艺。实验结果显示,缸盖的失效主要表现为表面环形压痕和平面度超差,压痕区附近出现较多白色条状的Si相,硬度有所升高;高速电弧喷涂Al-RE涂层的组织致密,硬度略低于LM25TF铝合金基体,热压变形实验后涂层与铝合金基体结合良好,未出现裂纹和剥离。综合实验结果和典型零件的应用情况表明,高速电弧喷涂Al-RE涂层技术可实现铝合金缸盖的再制造。Considering the requirement of remanufacturing a type of disused automobile engine aluminum cylinder head, the invalidation characteristics of the engine cylinder was analyzed, and the reman- ufacturing process of high velocity arc spraying A1-RE coating was put forward and investigated. The experiment results show that, ring type impress and out-of-tolerance flatness on the cylinder head sur-face are the main invalidation behaviors. Near the impress zone, some white strip-like Si phase was found, and the hardness increased. The high velocity arc sprayed AI-RE coating has a dense structure and the hardness is slightly lower than that of the LM25 TF aluminum alloy substrate. After the heat impressing experiment, the coating is adhered well with the substrate, no cracks or breakaway are found. Combining the experimental and case-study results, it can be concluded that the high velocity arc spraying A1-RE coating technology is available for remanufacturing aluminum alloy cylinder heads.

关 键 词：再制造 高速电弧喷涂 汽车发动机 铝合金缸盖 

分 类 号：TG174[金属学及工艺—金属表面处理]