{"id":11142,"date":"2021-11-10T09:36:00","date_gmt":"2021-11-10T01:36:00","guid":{"rendered":"\/\/m.letratesoro.com\/?p=11142"},"modified":"2024-05-12T10:52:22","modified_gmt":"2024-05-12T02:52:22","slug":"cn-pcb-wicking","status":"publish","type":"post","link":"\/\/m.letratesoro.com\/2021\/11\/cn-pcb-wicking\/","title":{"rendered":"[\u7b80\u4e2d]\u4f55\u8c13PCB\u300c\u706f\u82af\u6548\u5e94(wicking)\u300d\uff1f\u706f\u82af\u73b0\u8c61\u4f1a\u5bfc\u81f4\u4ec0\u4e48\u54c1\u8d28\u95ee\u9898\uff1f"},"content":{"rendered":"
<\/font><\/p>\n \u300c\u706f\u82af\u300d\u6307\u7684\u662f\u8721\u70db\u6216\u53e4\u8001\u6cb9\u706f\u70b9\u71c3\u65f6\u6301\u7eed\u4f9b\u6cb9\u71c3\u70e7\u7684\u854a\u82af\u90e8\u5206\uff0c\u901a\u5e38\u4ee5\u5bb9\u6613\u5438\u6cb9\u7684\u7ec6\u4e1d\u72b6\u7ea4\u7ef4\u6216\u68c9\u4e1d\u637b\u6210\u675f\u7ebf\u6765\u5145\u5f53\u3002\u56e0\u4e3a\u4e0d\u662f\u878d\u5408\uff0c\u6240\u4ee5\u5728\u7ea4\u7ef4\u4e0e\u7ea4\u7ef4\u4e4b\u95f4\u5b58\u5728\u4e00\u4e9b\u6781\u5c0f\u7684\u7f1d\u9699\uff0c\u5c06\u82af\u7ebf\u4e00\u7aef\u6d78\u6ce1\u4e8e\u71c3\u6cb9\u6db2\u4f53\u5185\uff0c\u6db2\u4f53\u5c31\u4f1a\u56e0\u4e3a\u300c<\/font>\u6bdb\u7ec6\u7ba1\u4f5c\u7528(capillary action)<\/font><\/a>\u300d\u6cbf\u7740\u8fd9\u4e9b\u7ea4\u7ef4\u95f4\u7684\u7f1d\u9699\u79fb\u52a8\u524d\u8fdb\uff0c\u6b64\u4f5c\u7528\u5c31\u79f0\u4e4b\u4e3a\u300c\u706f\u82af\u6548\u5e94(wicking effect)\u300d\u3002<\/font><\/p>\n \u8721\u70db\u7684\u706b\u706f\u6cb9\u71c3\u70e7\u65f6\u6240\u70e7\u6389\u7684\u5927\u90e8\u5206\u90fd\u662f\u7ecf\u7531\u706f\u82af\u8f93\u9001\u4e0a\u6765\u7684\u6db2\u6001\u6cb9\uff0c\u800c\u4e0d\u662f\u706f\u82af\uff0c\u8fd9\u4e5f\u662f\u706f\u82af\u4e3a\u4f55\u53ef\u4ee5\u6301\u4e45\u71c3\u70e7\u7684\u539f\u56e0\u3002<\/font><\/p>\n \u9802\u7aef\u5716\u7247\u7531<\/font>Upali Senarath Bandara<\/font><\/a>\u5728<\/font>Pixabay<\/font><\/a>\u4e0a\u767c\u5e03<\/font><\/p>\n <\/p>\n \u7535\u5b50\u5236\u9020\u4e1a\u4e2d\u7684\u300c\u706f\u82af\u6548\u5e94(wicking effect)\u300d\u4e00\u822c\u6307\u7684\u662fPCB\u57fa\u677f\u5728\u673a\u68b0\u94bb\u5b54(\u7b80\u79f0\u300c\u673a\u94bb\u300d)\u5236\u4f5c<\/font>PTH<\/font><\/a>\u53ca<\/font>via<\/font><\/a>\u5b54\u65f6\uff0c\u5bb9\u6613\u56e0\u4e3a\u632f\u52a8\u6469\u64e6\u4ea7\u751f\u9ad8\u70ed\u878d\u5316\u6811\u8102\u3002\u53e6\u5916\uff0c\u94bb\u5934\u9ad8\u901f\u65cb\u8f6c\u7684\u6495\u626f\u529b\u9053\u4e5f\u4f1a\u9020\u6210\u73bb\u7483\u7ea4\u7ef4\u7eb1\u675f\u4e2d\u7ea4\u7ef4\u4e0e\u7ea4\u7ef4\u95f4\u70b8\u5f00\u3002\u5728PCB\u5236\u4f5c\u7684\u540e\u7eed\u7535\u9540\u94dc\u4f5c\u4e1a\u65f6\uff0c\u6db2\u6001\u94dc\u5c31\u4f1a\u6cbf\u7740\u8fd9\u4e9b\u57fa\u677f\u7ea4\u7ef4\u95f4\u88c2\u5f00\u7684\u7f1d\u9699\u800c\u53d1\u751f\u6d78\u900f\u7684\u73b0\u8c61\uff0c\u56e0\u4e3a\u5176\u6e17\u94dc\u73b0\u8c61\u5c31\u5982\u540c\u706f\u82af\u5438\u6cb9\u7684\u539f\u7406\uff0c\u6545\u4ee5\u300c\u706f\u82af\u6548\u5e94\u300d\u79f0\u4e4b\uff0c\u5176\u5b9e\u8bf4\u7a7f\u4e86\u8fd9\u5c31\u662f\u4e00\u79cd\u300c<\/font>\u6bdb\u7ec6\u73b0\u8c61<\/font><\/a>\u300d\u7684\u4f53\u73b0\u3002<\/font><\/p>\n <\/p>\n \u8fd9\u91cc\u8981\u5148\u8bf4\u660e\u4e00\u4e0b\uff0c\u7535\u8def\u677f\u7684\u57fa\u6750\u4e2d\u9664\u4e86\u6709\u73bb\u7483\u7ea4\u7ef4\u7eb1\u675f\u5916\uff0c\u8fd8\u4f1a\u6dfb\u52a0\u5927\u91cf\u7684\u6df7\u5408\u6811\u8102(resin matrix)\u53ca\u586b\u5145\u6599(fillers)\u6765\u592f\u5b9e\u586b\u6ee1\u57fa\u677f\u7684\u7ed3\u6784\u4e0e\u5f3a\u5ea6\u3002\u5728\u6b63\u5e38\u7684\u60c5\u51b5\u4e0b\uff0c\u73bb\u7ea4\u7684\u5468\u56f4\u90fd\u4f1a\u88ab\u8fd9\u4e9b\u6811\u8102\u53ca\u586b\u5145\u6599\u5360\u6ee1\uff0c\u6240\u4ee5\u4e00\u822c\u300c\u706f\u82af(wicking)\u300d\u7684\u95ee\u9898\u4e0d\u4f1a\u592a\u4e25\u91cd\uff0c\u800c\u4e14\u706f\u82af\u7684\u6df1\u5ea6\u4e5f\u4e0d\u4f1a\u592a\u957f\u3002<\/font><\/p>\n \u5efa\u8bae\u5ef6\u4f38\u9605\u8bfb\uff1a<\/font>\u7535\u8def\u677fPCB\u677f\u6750\u7684\u7ed3\u6784\u4e0e\u529f\u80fd\u4ecb\u7ecd<\/font><\/a><\/p>\n \u5bf9\u4e8e\u4e2d\u56fd\u5927\u9646\u90a3\u4e9b\u76d7\u6587\u7f51\u7ad9\uff0c\u590d\u5236\u8d34\u4e0a\u672c\u7ad9\u6587\u7ae0\u540e\uff0c\u5c45\u7136\u8fd8\u6539\u6210\u81ea\u5df1\u516c\u53f8\u7684\u540d\u5b57\uff0c\u611f\u5230\u65e0\u803b\uff01\u6587\u7ae0\u5185\u5bb9\u90e8\u5206\u9632\u6b62\u590d\u5236\u7f16\u6392\u53ef\u80fd\u9020\u6210\u60a8\u9605\u8bfb\u7684\u4e0d\u4fbf\uff0c\u8bf7\u89c1\u8c05\uff01\uff09<\/font><\/em><\/p>\n \u4f46\u662f\u300c\u706f\u82af(wicking)\u300d\u73b0\u8c61\u5728\u7ec4\u88c5\u7535\u8def\u677f(PCBA)\u4e0a\u786e\u5b9e\u662f\u4e2a\u54c1\u8d28\u7684\u4e0d\u5b9a\u65f6\u70b8\u5f39\uff0c\u56e0\u4e3a\u5728\u7279\u5b9a\u7684\u6761\u4ef6\u4e0b<\/font>\u706f\u82af(\u6e17\u94dc)\u7684\u957f\u5ea6\u53ef\u662f\u4f1a\u7ee7\u7eed\u751f\u957f\u7684\uff0c\u6700\u540e\u8fd8\u53ef\u80fd\u5f15\u8d77\u7535\u6027\u4e0a\u7684\u77ed\u8def(short)\uff0c\u9020\u6210\u7535\u5b50\u4ea7\u54c1\u529f\u80fd\u4e0d\u826f\uff0c\u6216\u662f\u6f0f\u7535\u6d41(leakage current)\u5927\u589e\u7b49\u95ee\u9898<\/span>\u3002\u6240\u4ee5\uff0c\u4e1a\u754c\u5176\u5b9e\u5728\u5f88\u65e9\u4ee5\u524d\u5c31\u5df2\u7ecf\u5728IPC-A-600\u4e2d\u63d0\u51fa\u8981\u7ba1\u63a7\u300c\u706f\u82af(wicking)\u300d\u957f\u5ea6\u7684\u5141\u6536\u6807\u51c6\u3002\uff08\u4e2a\u4eba\u8ba4\u4e3aIPC\u540e\u7eed\u5e94\u8be5\u4f1a\u7ee7\u7eed\u66f4\u65b0\u5e76\u52a0\u4e25\u8fd9\u4e2a\u6807\u51c6\uff0c\u56e0\u4e3a\u73b0\u5728\u7684\u6807\u51c6\u6709\u70b9\u592a\u5bbd\u677e\uff0c\u5df2\u7ecf\u4e0d\u7b26\u5408\u5f80\u540e\u79d1\u6280\u7684\u9700\u6c42\u4e86\u3002\uff09<\/font><\/p>\n <\/p>\n \u968f\u7740\u624b\u673a\u7684\u6d41\u884c\u66f4\u8fd1\u4e00\u6b65\u63a8\u5347\u79d1\u6280\u7684\u8fdb\u6b65\uff0c\u73b0\u5728\u7535\u8def\u677f\u7684\u7ebf\u8def\u53cavia\u8bbe\u8ba1\u8d8a\u6765\u8d8a\u5bc6\u96c6\uff0c\u53e0\u5c42\u5219\u8d8a\u6765\u8d8a\u591a\uff0c\u6240\u4ee5\u300c\u706f\u82af(wicking)\u300d\u7684\u95ee\u9898\u4e5f\u4f1a\u8d8a\u6765\u8d8a\u53d7\u5230\u91cd\u89c6\uff0c\u800c\u4e14\u4e5f\u6709\u8d8a\u6765\u8d8a\u591a\u7684\u300cCAF (Conductive Anodic Filament)\uff0c\u7535\u8def\u677f\u5185\u5fae\u77ed\u8def\u73b0\u8c61<\/a>\u300d\u9020\u6210\u7684\u4e0d\u826f\u6848\u4f8b\u88ab\u63d0\u51fa\u6765\u8ba8\u8bba\u4e14\u8981\u6c42\u6539\u5584\u3002<\/font><\/font><\/p>\n \u6240\u8c13\u7684CAF\u662f\u5728\u540c\u65f6\u5177\u6709\u6c34\u6c14(\u6eb6\u5242)\u3001\u504f\u538b(\u5f62\u6210\u6c27\u5316\u8fd8\u539f)\u3001\u901a\u9053(\u6bdb\u7ec6\u4f5c\u7528)\u3001\u9732\u94dc(\u53ef\u4ee5\u5f62\u6210\u79bb\u5b50\u7684\u91d1\u5c5e\u5143\u7d20)\u7684\u6761\u4ef6\u4e0b\u7ed3\u5408\u706f\u82af\u73b0\u8c61\u6240\u9020\u6210\u7684\u4e00\u79cd\u300c\u7535\u79bb\u5b50\u5316\u5b66\u8fc1\u79fb(electrochemical migration)\u300d\u6216\u79f0\u4e4b\u4e3a\u300c\u94dc\u8fc1\u79fb\u300d\u73b0\u8c61\uff0c\u5b83\u4e00\u5f00\u59cb\u4f1a\u9020\u6210\u76f8\u90bb\u7535\u8def\u7684\u95f4\u6b47\u6027\u5fae\u77ed\u8def\uff0c\u8ba9\u4ea7\u54c1\u529f\u80fd\u95f4\u6b47\u6027\u7684\u65f6\u597d\u65f6\u574f\uff0c\u867d\u7136\u6700\u7ec8\u53ef\u80fd\u5bfc\u81f4\u6301\u7eed\u6027\u7684\u77ed\u8def\uff0c\u4f46\u5728\u8fd9\u4e4b\u524d\u4ea7\u54c1\u5927\u6982\u5c31\u5df2\u7ecf\u88ab\u5ba2\u8bc9\u6216\u629b\u5f03\u4e86\u3002<\/font><\/p>\n \u5efa\u8bae\u5ef6\u4f38\u9605\u8bfb\uff1a<\/font>CAF(\u7535\u8def\u677f\u5fae\u77ed\u8def)\u5f62\u6210\u7684\u53ef\u80fd\u539f\u56e0\u4e0e\u6539\u5584\u5bf9\u7b56<\/font><\/a><\/p>\n \u5bf9\u4e8e\u4e2d\u56fd\u5927\u9646\u90a3\u4e9b\u76d7\u6587\u7f51\u7ad9\uff0c\u590d\u5236\u8d34\u4e0a\u672c\u7ad9\u6587\u7ae0\u540e\uff0c\u5c45\u7136\u8fd8\u6539\u6210\u81ea\u5df1\u516c\u53f8\u7684\u540d\u5b57\uff0c\u611f\u5230\u65e0\u803b\uff01\u6587\u7ae0\u5185\u5bb9\u90e8\u5206\u9632\u6b62\u590d\u5236\u7f16\u6392\u53ef\u80fd\u9020\u6210\u60a8\u9605\u8bfb\u7684\u4e0d\u4fbf\uff0c\u8bf7\u89c1\u8c05\uff01\uff09<\/font><\/em><\/p>\n \u5de5\u4f5c\u718a\u77e5\u9053\u6709\u5f88\u591aSMT\u8d34\u7247\u53caPCBA\u7ec4\u88c5\u5de5\u5382\u5de5\u7a0b\u5e08\u4eec\u8ba4\u4e3a\u7684\u300c\u706f\u82af\u73b0\u8c61\u300d\u597d\u50cf\u662f\u710a\u76d8\u4e0a\u7684\u9521\u818f\u5728\u56de\u710a\u8fc7\u7a0b\u4e2d\u5927\u90e8\u5206\u88ab\u710a\u811a\u5438\u8d70\u7684\u73b0\u8c61\u3002\u867d\u7136\u8bf4\u8fd9\u79cd\u73b0\u8c61\u4e5f\u53ef\u4ee5\u7b97\u662f\u4e00\u79cd\u300c\u6bdb\u7ec6\u73b0\u8c61\u300d\u7684\u4f53\u73b0\uff0c\u4f46\u662f\u5728IPC\u7684\u6587\u4ef6\u4e2d\u5e76\u672a\u5b9a\u4e49\u8fd9\u79cd\u7684\u710a\u9521\u4e0d\u826f\u73b0\u8c61\uff0c\u4e5f\u672a\u7ed9\u4e88\u6b63\u5f0f\u540d\u79f0\u3002<\/font><\/p>\n <\/a>\u5de5\u4f5c\u718a\u4e2a\u4eba\u5c06\u8fd9\u79cd\u710a\u9521\u88ab\u710a\u811a\u5438\u8d70\u7684\u4e0d\u826f\u73b0\u8c61\u79f0\u4e4b\u4e3a\u3010\u710a\u9521\u706f\u82af\u8679\u5438\u6548\u5e94(Solder Wicking Effect)<\/font><\/strong>\u3011\uff0c\u7528\u6765\u4e0ePCB\u6e17\u94dc\u7684\u300c\u706f\u82af\u6548\u5e94(wicking effect)\u300d\u4f5c\u533a\u522b<\/font><\/p>\n \u518d\u5f3a\u8c03\u4e00\u6b21\u8fd9\u4e0d\u662f\u6b63\u5f0f\u540d\u79f0\u3002\u3010\u710a\u9521\u706f\u82af\u8679\u5438\u6548\u5e94(Solder Wicking Effect)\u3011\u901a\u5e38\u7528\u6765\u8bf4\u660ePCBA\u710a\u9521\u8fc7\u7a0b\u4e2dPCB\u710a\u76d8\u4e0a\u7684\u9521\u818f\u878d\u5316\u6da6\u6e7f\u540e\u6cbf\u7740\u96f6\u4ef6\u5f15\u811a\u7684\u8868\u9762\u91d1\u5c5e\u5f80\u4e0a\u722c\u5347\u7684\u73b0\u8c61\uff0c\u5b83\u4f1a\u9020\u6210\u710a\u76d8\u4e0a\u7684\u710a\u6599\u4e0d\u8db3\uff0c\u4e25\u91cd\u8005\u5f62\u6210\u7a7a\u710a(non-wetting)<\/a><\/font>\u6216\u5728\u76f8\u90bb\u5f15\u811a\u95f4\u53d1\u751f\u67b6\u6865\u77ed\u8def(solder bridge)\u3002<\/font><\/font><\/p>\n \u5efa\u8bae\u5ef6\u4f38\u9605\u8bfb\uff1a[\u7b80\u4e2d]\u4ec0\u4e48\u662f\u710a\u9521\u706f\u82af\u8679\u5438\u6548\u5e94(Solder Wicking Effect)\u4e0d\u826f\u73b0\u8c61\u4e0e\u89e3\u51b3\u5bf9\u7b56?<\/a><\/font><\/p>\n <\/font>\u5f53\u6211\u4eec\u9700\u8981\u4fee\u8865\u7ec4\u88c5\u7684\u7535\u8def\u677f\u65f6\uff0c\u5e38\u4f1a\u4ee5\u4eba\u5de5\u4f5c\u4e1a\u7684\u65b9\u5f0f\u6765\u8fdb\u884c\u9664\u9521\uff0c\u4e00\u822c\u4f1a\u9009\u62e9\u4f7f\u7528\u7eaf\u94dc\u7ec6\u7ebf\u637b\u6210\u7684\u5bbd\u6241\u5e26\u72b6\u7f16\u7ec7\u7ef3\uff08\u5438\u9521\u5e26\uff0cSolder Wick\uff09\u6765\u63a5\u89e6\u6216\u662f\u76f4\u63a5\u653e\u7f6e\u4e8e\u9700\u8981\u9664\u9521\u7684\u710a\u76d8\u4e0a\u65b9\uff0c\u7136\u540e\u7528\u70d9\u94c1\u76f4\u63a5\u52a0\u70ed\u4e8e\u5438\u9521\u5e26\u878d\u5316\u710a\u9521\uff0c\u8ba9\u5438\u9521\u5e26\u4e0a\u7684\u6e29\u5ea6\u6bd4\u8f83\u9ad8\uff0c\u5c31\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u591a\u4f59\u7684\u710a\u9521\u5438\u9644\u5728\u5438\u9521\u5e26\u4e0a\uff0c\u8fbe\u5230\u9664\u9521\u6574\u5e73\u7684\u6548\u679c\u3002\u6709\u6ca1\u6709\u89c9\u5f97\u8fd9\u4e2a\u63cf\u8ff0\u4e0e\u3010\u710a\u9521\u706f\u82af\u8679\u5438\u6548\u5e94(Solder Wicking Effect)\u3011\u5f88\u7c7b\u4f3c\uff1f\u662f\u7684\uff0c\u5438\u9521\u5e26\u7684\u5e94\u7528\u4e5f\u662f\u5229\u7528\u300c\u706f\u82af\u6548\u5e94\u300d\u6216\u300c\u6bdb\u7ec6\u4f5c\u7528\u300d\u539f\u7406\u6765\u8fbe\u5230\u5438\u9521\u7684\u5178\u578b\u505a\u6cd5\u3002<\/font><\/p>\n \u9898\u5916\u8bdd\uff0c\u5374\u662f\u4e00\u4e2a\u9887\u4e3a\u5f15\u4eba\u597d\u5947\u7684\u4eba\u4f53\u81ea\u71c3\u4e8b\u4ef6\u539f\u56e0\uff5e<\/font><\/p>\n 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PCBA\u7ec4\u88c5\u710a\u9521\u4e0a\u6240\u8c13\u7684\u300c\u706f\u82af\u6548\u5e94(Solder Wicking Effect)\u300d<\/font><\/h2>\n
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