压铸模型芯粘铝现象及其原因探究  

Study on the Phenomenon and Mechanism of Aluminum Adhering to Die Casting Core

作　　者：赵海峰 陆佳晖 冯宁宁 岳加佳 苏爱民 闵永安[2] Zhao Haifeng;Lu Jiahui;Feng Ningning;Yue Jiajia;Su Aimin;Min Yong’an(Kolbenschmidt Pierburg Shanghai Nonferrous Components Co.,Ltd.,Shanghai 201815,China;State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海皮尔博格有色零部件公司,上海200072 [2]省部共建高品质特殊钢冶金与制备国家重点实验室上海市钢铁冶金新技术开发应用重点实验室和上海大学材料科学与工程学院,上海200072

出　　处：《上海金属》2018年第5期93-97,103,共6页Shanghai Metals

基　　金：国家重点研发计划(No.2016YFB0300400;No.2016YFB0300405)

摘　　要：表面粘铝是压铸模型芯常见的失效方式。采用OM、SEM、XRD等手段对不同寿命型芯的表面与截面的形貌、组织、微区成分以及物相进行了分析。研究表明,当型芯表面PVD涂层存在缺陷时,铝合金液将较早地突破PVD涂层的防护直接侵蚀型芯基体,生成Fe-Al-Si中间相而引起铝的粘着。当表面PVD涂层均匀而完整并与基体结合良好时,型芯服役寿命较长。因此,PVD涂层质量是影响型芯抵抗铝合金液侵蚀和粘着的关键因素。Adhering aluminum is a typical failure way of die casting cores.The morphologies,microstructures,microarea composition and phases of the surface and cross sections of die casting cores put in service for different lengths of time were analyzed by optical microscope,scanning electron microscope and X ray diffractometer.The results showed that when some defects existed at the surface of PVD coating,the aluminum alloy liquid would be more easy to break through PVD coating and directly erode the core matrix,resulting in the adherence of aluminum due to formation of Fe-Al-Si intermediate phase.When the PVD coating was uniform and complete,and well bonded to the matrix,the core would have a longer service life.Therefore,the quality of PVD coating is a key factor in resistance of the core to erosion and adherence of molten aluminum.

关 键 词：粘铝 压铸型芯 PVD涂层 侵蚀 

分 类 号：TG241[金属学及工艺—铸造]