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哪些因素影响PCBA焊接的质量与厚度?

来源: 作者: 添加日期:2020-05-20 查看次数:0

    PCBA焊接金属间结合层的质量与厚度和以下因素有关。

  一、焊料的合金成分

  hejinchengfenshijuedinghangaoderongdianjihandianzhiliangdeguanjiancanshu。

  congyibanderunshililunshangjiang,daduoshujinshujiaolixiangdeqianhanwenduyinggaoyurongdian(yexiangxian)wendu15.5~71℃zhijianweiyi。duiyusnxihejin,jianyizaiyexiangxianzhishang30~40℃zuoyou。

  xiamianyisn-pbhanliaohejinweili,fenxihejinchengfenshijuedingrongdianjihandianzhiliangdeguanjiancanshu。

  (1)共晶合金的熔点最低,焊接温度也最低

  zaisn-pbhejinpeibizhong,gongjinghejinderongdianzuidi,63sn-37pbgongjinghejin(bdian)derongdianwei183℃,pcbhanjiewenduyezuidi,zai210~230℃zuoyou,hanjieshibuhuisunhuaiyuanjianhepcbdianluban。qitarenheyizhonghejinpeibideyexiangxiandoubigongjingwendugao,ru40sn-60pb(hdian)deyexiangxianwei232℃,qismttiepianhanjiewenduzai260~270℃zuoyou,xianranhanjiewenduchaoguoleyuanjianhepcbyinzhibandenaishoujixianwendu。

  (2)共晶合金的结构是最致密的,有利于提高焊点强度

  suoweigongjinghanliaojiushiyouguxiangbianyexianghuoyouyexiangbianguxiangjunzaitongyiwenduxiajinxing,zaicizufenxiadexixiaojinglihunhewujiaozuogongjinghejin。shengwenshidangwendudadaogongjingdianshihanliaoquanbuchengyexiangzhuangtai,jiangwenshidangwendujiangdaogongjingdianshi,yetaihanliaoyixiaziquanbubianchengguxiangzhuangtai,yincihandianninggushixingchengdejiejingkelizuixiao,jiegouzuizhimi,handianqiangduzuigao。erqitapeibidehejinlengningshijianzhang,xianjiejingdekelihuizhangda,yingxianghandianqiangdu。

  (3)共晶合金凝固时没有塑性范围或粘稠范围,有利于焊接工艺的控制

看片免费  gongjinghejinzaishengwenshizhiyaodaodagongjingdianwendu,jiuhuilijicongguxiangbianchengyexiang;fanzhi,lengqueninggushizhiyaojiangdaogongjingdianwendu,jiuhuilijicongyexiangbianchengguxiang,yincigongjinghejinzaironghuaheningguguochengzhongmeiyousuxingfanwei。hejinningguwendufanwei(suxingfanwei)duihanjiedegongyixinghehandianzhiliangyingxiangjida。suxingfanweidadehejin,zaihejinninggu、xingchenghandianshixuyaojiaozhangshijian,ruguozaihejinningguqijianpcbheyuanqijianyourenhezhendong(baokuopcbbianxing),douhuizaocheng“handianraodong”,youkenenghuifashenghandiankailie,shishebeiguozaosunhuai。congyishangfenxikeyidechujielun:hejinchengfenshijuedinghangaoderongdianjirongdianzhizuideguanjiancanshu。

看片免费  yinci,wulunshichuantongdesn-pbhanliaohaishiwuqianhanliao,yaoqiuhanliaodehejinzufenjinliangdadaogongjinghuojingongjing。

IMG_2892 拷贝.jpg

  二、合金表面的氧化程度

  hejinfenmobiaomiandeyanghuawuhanliangyezhijieyingxianghangaodekehanxing。yinweikuosanzhinengzaiqingjiedejinshubiaomianjinxing。suiranzhuhanjiyouqingxijinshubiaomianyanghuawudegongneng。danbunengquchuyanzhongdeyanghuawenti。yaoqiuhejinfenmodehanyangliangyingxiaoyu0.5%,zuihaokongzhizai80x10defu6cifangyixia。

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