基于粉末压片技术的新型复合焊锡片制备工艺研究  

Study on the Preparation Process of Novel Composite Solder Sheet Based on Powder Pressing Technology

作　　者：王思鸿 李晨 黄世盛 陈飘飘 费松华 刘家军 WANG Sihong;LI Chen;HUANG Shisheng;CHEN Piaopiao;FEI Songhua;LIU Jiajun(Zhejiang Huaguang Key Enterprise Research Institute of New Green Brazing Materials,Hangzhou 311100,China;Hangzhou Hua Guang Welding New Material Co.,Ltd.,Hangzhou 311100,China)

机构地区：[1]浙江省华光新型绿色钎焊材料重点企业研究院,浙江杭州311100 [2]杭州华光焊接新材料股份有限公司,浙江杭州311100

出　　处：《电焊机》2024年第10期93-98,共6页Electric Welding Machine

摘　　要：为探究粉末压片技术在制备复合焊锡片中的应用,并研究不同压制工艺参数对复合焊锡片力学特性、微观形貌和钎焊性能的影响。采用SAC305合金粉末与自研助焊剂预混合,通过粉末压片技术制备复合焊锡片,并设计了三水平三因素的正交试验,分析了压力、压制温度和压制时间对复合焊锡片性能的影响。结果表明,压力是压制参数中对复合锡片性能影响最大的,当压力不足时,复合锡片的显微结构可以看到锡合金粉之间明显的界面区分,且粉末形变量较小,孔隙率较高;随着压力提高,粉末发生明显形变,界面逐渐模糊,孔隙率也减小;不同工艺参数对钎焊扩展率及空洞率的影响较小。在压力5000 MPa,压制时间30 s,温度60℃条件下制备的复合焊锡片具有良好的钎焊性能,孔隙率最小为7.2%且具备一定的自身强度,在镍片上的钎焊润湿性良好,焊后空洞率低于0.1%。与传统表面涂敷助焊剂的预成型焊锡片相比,粉末压片制备的复合焊锡片在钎焊性能上相当,且具有更高的成品率,对批量应用具备一定的技术可行性。This study aims to investigate the application of powder pressing technology in the preparation of composite solder sheets and to research the effects of different pressing process parameters on the mechanical properties,microstructure,and brazing performance of composite solder sheets.SAC305 alloy powder and self-developed flux were pre-mixed and then pressed into composite solder sheets using powder pressing technology.A three-level three-factor orthogonal experiment was designed to analyze the effects of pressure,pressing temperature,and pressing time on the properties of the composite solder sheets.The results show that pressure is the most significant pressing parameter affecting the properties of the composite solder sheets.When the pressure is insufficient,the microstructure of the composite solder sheet exhibits distinct interface distinctions between tin alloy powder particles,with a small powder deformation and a high porosity.With increasing pressure,the powder undergoes obvious deformation,the interfaces become blurred,and the porosity decreases.The effects of pressing temperature and pressing time on the brazing performance of the composite solder sheets are significant,as high temperatures or prolonged pressing times can lead to increased oxidation of the tin powder and reduced flux activity,thereby decreasing brazing performance and increasing the rate of post-welding porosity.The effects of different process parameters on brazing expansion rate and cavity rate are relatively small.Composite solder sheets prepared under the conditions of 5,000 MPa pressure,30 s pressing time,and 60℃temperature exhibit good brazing performance,with a minimum porosity of 7.2%and certain self-strength.These sheets demonstrate good wettability on nickel sheets and a post-welding cavity rate of less than 0.1%.Compared with traditional pre-formed solder sheets with surface-applied flux,the powder-pressed composite solder sheets have equivalent brazing performance and higher yield,making them technically feasible for ba

关 键 词：复合焊锡片 粉末压片 钎焊性能 压制工艺 

分 类 号：TG425[金属学及工艺—焊接]