{"id":2832,"date":"2014-02-19T08:26:00","date_gmt":"2014-02-19T00:26:00","guid":{"rendered":"\/\/m.letratesoro.com\/?p=2832"},"modified":"2022-09-10T13:29:49","modified_gmt":"2022-09-10T05:29:49","slug":"solder-tombstone","status":"publish","type":"post","link":"\/\/m.letratesoro.com\/2014\/02\/solder-tombstone\/","title":{"rendered":"\u96fb\u963b\u96fb\u5bb9\u5c0f\u96f6\u4ef6\u767c\u751f\u7a7a\u710a\u53ca\u7acb\u7891(\u5893\u7891\u6548\u61c9)\u7684\u539f\u56e0"},"content":{"rendered":"
\u6700\u8fd1\u6709\u7db2\u53cb\u8a62\u554f\u95dc\u65bc\u96fb\u963b\u3001\u96fb\u5bb9\u9019\u985eSMD\u5c0f\u96f6\u4ef6(small chip)\u6709\u7a7a\u710a(solder empty)<\/font><\/strong>\u7684\u554f\u984c\u3002\u660e\u660e\u5df2\u7d93\u4e00\u518d\u7684\u6aa2\u67e5\u904e\u6240\u6709\u56de\u710a\u7210\u6eab\u5ea6<\/a>(Reflow Profile)\u8a2d\u5b9a\u4e26\u78ba\u8a8d\u7121\u8aa4\uff0c\u53ef\u662f\u9084\u662f\u7d93\u5e38\u767c\u73fe\u9019\u985e\u96fb\u963b\u96fb\u5bb9\u6709\u7a7a\u710a\u7684\u60c5\u5f62\u767c\u751f\uff0c\u800c\u4e14\u9084\u51fa\u73fe\u5728\u56fa\u5b9a\u4f4d\u7f6e\uff0c\u89c0\u5bdf\u710a\u932b\u7684\u72c0\u6cc1\u4e5f\u672a\u767c\u73fenon-wetting\u6216de-wetting\u7684\u60c5\u5f62\uff0c\u767e\u601d\u4e0d\u5f97\u5176\u89e3\uff1f<\/font><\/p>\n \u5176\u5be6\u9019\u985e\u96f6\u4ef6\u7a7a\u710a\u7684\u554f\u984c\u4e26\u6c92\u6709\u90a3\u9ebc\u96e3\u7406\u89e3\u5566\uff01\u5b83\u7684\u751f\u6210\u539f\u56e0\u5c31\u8ddf\u7acb\u7891(tombstone)<\/font><\/strong>\u7684\u539f\u56e0\u662f\u4e00\u6a23\u7684\uff0c\u8aaa\u7a7f\u4e86\u5c31\u662f<\/font><\/p>\n \u96f6\u4ef6\u5169\u7aef\u7684\u932b\u818f<\/strong>\u878d\u5316\u6642\u9593\u4e0d\u4e00\u81f4\uff0c<\/strong><\/font><\/p>\n <\/font> <\/p>\n \u6700\u7d42\u9020\u6210\u53d7\u529b\u4e0d\u5747\uff0c\u4ee5\u81f4\u4e00\u7aef\u7ff9\u8d77\u7684\u7d50\u679c\u3002<\/strong><\/font><\/p>\n <\/p>\n \u5982\u679c\u4ed4\u7d30\u89c0\u5bdf\u51fa\u554f\u984cPCB\u4e0a\u7684\u9285\u7b94\u4f48\u7dda\uff0c\u901a\u5e38\u53ef\u4ee5\u767c\u73fe\u5728\u9019\u985e\u96f6\u4ef6\u7684\u67d0\u4e00\u7aef\u6709\u9023\u63a5\u8457\u5927\u7247\u7684\u9285\u7b94\uff0c\u800c\u53e6\u5916\u4e00\u7aef\u5247\u6c92\u6709\u3002\u901a\u5e38PCB\u5728\u9032\u5165Reflow\u7210\u5b50\u4e26\u958b\u59cb\u52a0\u71b1\u6642\uff0c\u8d8a\u662f\u8868\u9762\u7684\u9285\u7b94\uff0c\u5176\u53d7\u71b1\u7684\u7a0b\u5ea6\u6703\u8d8a\u5feb\uff0c\u4e5f\u5c31\u662f\u6703\u6bd4\u8f03\u5feb\u5230\u9054\u56de\u710a\u7210\u5167\u7684\u74b0\u5883\u6eab\u5ea6\uff0c\u800c\u8d8a\u5167\u5c64\u7684\u5927\u7247\u9285\u7b94\u7684\u53d7\u71b1\u5247\u6703\u8f03\u6162\uff0c\u4e5f\u5c31\u662f\u6703\u6bd4\u8f03\u6162\u5230\u9054\u56de\u710a\u7210\u5167\u7684\u74b0\u5883\u6eab\u5ea6\uff0c\u7576\u96f6\u4ef6\u4e00\u7aef\u7684\u932b\u818f\u6bd4\u53e6\u4e00\u7aef\u8f03\u65e9\u878d\u5316\u6642\uff0c\u5c31\u6703\u4ee5\u932b\u818f\u5148\u878d\u5316\u7684\u9019\u7aef\u70ba\u652f\u9ede\u8209\u8d77\u96f6\u4ef6\uff0c\u9020\u6210\u96f6\u4ef6\u7684\u8d77\u53e6\u4e00\u7aef\u7a7a\u710a\uff0c\u96a8\u8457\u932b\u818f\u878d\u5316\u7684\u6642\u9593\u5dee\u8d8a\u5927\uff0c\u96f6\u4ef6\u88ab\u8209\u8d77\u7684\u89d2\u5ea6\u5c31\u6703\u8d8a\u5927\uff0c\u6700\u5f8c\u5f62\u6210\u5b8c\u5168\u7acb\u7891(tombstone)\u7684\u7d50\u679c\u3002<\/font><\/p>\n \u6709\u8208\u8da3\u6df1\u5165\u7814\u7a76\u7acb\u7891\u771f\u6b63\u5f62\u6210\u539f\u56e0\u7684\u670b\u53cb\u53ef\u4ee5\u5f9e\u529b\u5b78\u7684\u89d2\u5ea6\u5207\u5165\uff0c\u7576\u4e00\u7aef\u7684\u62c9\u529b\u9ad8\u904e\u53e6\u4e00\u7aef\u6642\uff0c\u61c9\u8a72\u9084\u8981\u5728\u52a0\u4e0a\u96f6\u4ef6\u91cd\u91cf\u4e26\u8a08\u7b97\u5176\u91cd\u5fc3\u4f4d\u7f6e\uff0c\u5c31\u53ef\u4ee5\u4e00\u7aef\u70ba\u652f\u9ede\u5c07\u96f6\u4ef6\u7684\u53e6\u4e00\u7aef\u8209\u8d77\u3002<\/font><\/p>\n \u4e0b\u9762\u5169\u5f35\u5716\u662f\u82e6\u4e3b\u767c\u751f\u7a7a\u710a\u7684\u5716\u7247\uff0c\u7d93\u82e6\u4e3b\u540c\u610f\u653e\u4e0a\u4f86\u7d66\u52a0\u5927\u5bb6\u8a0e\u8ad6\u53c3\u8003\uff0c\u4e5f\u6b61\u8fce\u5927\u5bb6\u63d0\u4f9b\u610f\u898b\u3002 \u89e3\u6c7a\u9019\u985e\u7acb\u7891\u7a7a\u710a\u7684\u65b9\u6cd5\u6709\uff1a<\/em><\/strong><\/font><\/p>\n <\/font><\/li>\n <\/font><\/ol>\n <\/p>\n \u5176\u4ed6\u6ce8\u610f\u4e8b\u9805\uff1a<\/font><\/strong>\u4e0a\u8ff0\u7a7a\u710a\u53ca\u7acb\u7891\u7684\u767c\u751f\uff0c\u53ea\u662f\u773e\u591a\u53ef\u80fd\u539f\u56e0\u4e4b\u4e00\uff0c\u4e0b\u5217\u9805\u76ee\u4e5f\u90fd\u662f\u53ef\u80fd\u5f15\u8d77\u7acb\u7891\u7684\u53ef\u80fd\u539f\u56e0\uff1a<\/font><\/p>\n
<\/font><\/p>\n\n
\u2714\u53ef\u4ee5\u5728\u5927\u9285\u7b94\u7684\u7aef\u9ede\u8655\u52a0\u4e0a\u3010\u71b1\u963b (thermal relief)<\/a>\u3011\u8a2d\u8a08\u4f86\u6e1b\u7de9\u6eab\u5ea6\u6563\u5931\u904e\u5feb\u7684\u554f\u984c\u3002
\u2714\u7e2e\u5c0f\u5169\u7aef\u710a\u588a\u7684\u5167\u8ddd\u5c3a\u5bf8\uff0c\u5728\u4e0d\u9020\u6210\u77ed\u8def\u7684\u60c5\u6cc1\u4e0b\u76e1\u91cf\u7e2e\u5c0f\u5169\u7aef\u710a\u588a\u9593\u7684\u8ddd\u96e2\uff0c\u9019\u6a23\u53ef\u4ee5\u8b93\u8f03\u6162\u878d\u932b\u4e00\u7aef\u7684\u932b\u818f\u6709\u66f4\u5927\u7684\u7a7a\u9593\u53ef\u4ee5\u9ecf\u4f4f\u672c\u9ad4\u514d\u65bc\u7acb\u8d77\uff0c\u4e5f\u5c31\u662f\u589e\u52a0\u7acb\u7891\u7684\u96e3\u5ea6\u3002
\u2714\u5169\u7aef\u710a\u588a\u6709\u4e00\u7aef\u63a1\u7528SMD\u710a\u588a\u8a2d\u8a08<\/a>\uff0c\u800c\u53e6\u4e00\u7aef\u63a1\u7528NSMD\u6642\uff0c\u5c31\u5bb9\u6613\u51fa\u73fe\u5169\u7aef\u710a\u588a\u5c3a\u5bf8\u4e0d\u4e00\u6a23\u5927\uff0c0402\u4ee5\u4e0a\u7684\u96f6\u4ef6\u53ef\u80fd\u9084\u597d\uff0c\u4f460201\u4ee5\u4e0b\u7684\u96f6\u4ef6\u5c31\u53ef\u80fd\u51fa\u73fe\u932b\u818f\u91cf\u914d\u5408\u4e0d\u4e0a\u710a\u588a\u5927\u5c0f\u7684\u554f\u984c\uff0c\u878d\u932b\u6642\u5169\u7aef\u62c9\u529b\u4e0d\u4e00\u81f4\u5c0e\u81f4\u7acb\u7891\u7684\u60c5\u5f62\u3002<\/font><\/li>\n
\u53ef\u4ee5\u63d0\u9ad8\u56de\u710a\u7210\u6d78\u6f64\u5340\u7684\u6eab\u5ea6\uff0c\u8b93\u6eab\u5ea6\u66f4\u63a5\u8fd1\u878d\u932b\u6eab\u5ea6\u3002\u4e5f\u53ef\u4ee5\u6e1b\u7de9\u5f9e\u6d78\u6f64\u5340\u9032\u5165\u56de\u710a\u5340(soak to ramp)\u5347\u6eab\u7684\u901f\u5ea6\u3002\u76ee\u7684\u5c31\u662f\u8981\u8b93PCB\u4e0a\u6240\u6709\u9285\u7b94\u53ca\u96fb\u5b50\u96f6\u4ef6\u7684\u6eab\u5ea6\u90fd\u80fd\u9054\u5230\u4e00\u81f4\uff0c\u7136\u5f8c\u540c\u6642\u878d\u932b\u3002\uff08\u203b\u8acb\u6ce8\u610f<\/font><\/strong>\uff1a\u96a8\u610f\u8abf\u6574\u56de\u710a\u7210\u7684\u6eab\u5ea6\u66f2\u7dda\u53ef\u80fd\u5f15\u8d77\u5176\u4ed6\u554f\u984c\uff0c\u8acb\u53c3\u8003\u3010\u56de\u6d41\u710a\u7684\u6eab\u5ea6\u66f2\u7dda Reflow Profile<\/a>\u3011\u4e00\u6587\u3002\uff09<\/font> <\/font><\/li>\n
\u5982\u679c\u56de\u710a\u7210\u4e2d\u6709\u958b\u6c2e\u6c23\uff0c\u53ef\u4ee5\u8a55\u4f30\u95dc\u6389\u6c2e\u6c23\u8a66\u770b\u770b\uff0c\u6c2e\u6c23\u96d6\u7136\u53ef\u4ee5\u9632\u6b62\u6c27\u5316\u3001\u5e6b\u52a9\u710a\u932b\uff0c\u4f46\u5b83\u4e5f\u6703\u52a0\u5feb\u878d\u932b\u5f8c\u6f64\u6fd5\u7684\u901f\u5ea6\uff0c\u9020\u6210\u90e8\u4efd\u710a\u9ede\u63d0\u524d\u6f64\u6fd5\uff0c\u60e1\u5316\u4e86\u5169\u7aef\u5403\u932b\u7684\u6642\u9593\u5dee\uff0c\u6700\u7d42\u8b93\u5169\u7aef\u7684\u529b\u8ddd\u5dee\u7570\u904e\u5927\u7d42\u81f4\u5f62\u6210\u7acb\u7891\u554f\u984c\u3002
\u5efa\u8b70\u5ef6\u4f38\u95b1\u8b80\uff1aSMT\u56de\u710a\u7210\u52a0\u6c2e\u6c23(N2)\u7684\u512a\u7f3a\u9ede\u63a2\u8a0e<\/a><\/font><\/div>\n<\/li>\n
\u67d0\u4e9b\u926d\u8cea\u96fb\u5bb9(tantalum electrolytic capacitor)\u672c\u8eab\u88fd\u7a0b\u4e0d\u826f\u6b98\u7559\u6709\u672a\u5b8c\u5168\u5206\u89e3\u7684Mn(NO3<\/sub>)2<\/sub>\u5176\u751f\u7522\u904e\u7a0b\u4e2d\uff0c\u4e26\u5728\u7121\u925b\u56de\u710a\u9ad8\u6eab\u7684210\uff5e250\u00b0C\u6642\u5206\u89e3\u91cb\u653e\u51faNO2<\/sub>\u6c23\u9ad4\uff0c\u4e26\u5439\u98db\u5439\u6b6a\u672c\u8eab\u53ca\u5468\u906d\u7684\u96f6\u4ef6\u3002
Mn(NO3<\/sub>)2<\/sub> = MnO2<\/sub> + 2NO2<\/sub> \u2191
\u5982\u679c\u78b0\u5230\u9019\u6a23\u7684\u554f\u984c\uff0c\u6700\u597d\u7684\u65b9\u6cd5\u5c31\u662f\u66f4\u63db\u926d\u8cea\u96fb\u5bb9\uff0c\u5426\u5247\u5fc5\u9808\u4e8b\u5148\u904e\u4e00\u6b21\u56de\u710a\u7684\u9ad8\u6eab\u3002
\u9019\u88e1\u6709\u4e00\u4efd\u7c21\u9ad4\u5b57\u95dc\u65bc\u926d\u8cea\u96fb\u5bb9\u5439\u6c23\u7684\u7406\u8ad6(pdf)<\/a>\u7814\u7a76\u7684\u6587\u7ae0\u53ef\u4ee5\u53c3\u8003\u3002
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