{"id":1824,"date":"2012-04-29T08:42:00","date_gmt":"2012-04-29T00:42:00","guid":{"rendered":"\/\/m.letratesoro.com\/2012\/04\/au-role\/"},"modified":"2022-04-14T11:25:08","modified_gmt":"2022-04-14T03:25:08","slug":"au-role","status":"publish","type":"post","link":"\/\/m.letratesoro.com\/2012\/04\/au-role\/","title":{"rendered":"\u6d78\u91d1\u53ca\u96fb\u934d\u91d1\u5728\u96fb\u8def\u677f\u710a\u63a5\u4e2d\u6240\u626e\u6f14\u7684\u89d2\u8272"},"content":{"rendered":"

\"\u6d78\u91d1\u53ca\u96fb\u934d\u91d1\u5728\u96fb\u8def\u677f\u710a\u63a5\u4e2d\u6240\u626e\u6f14\u7684\u89d2\u8272\"<\/font><\/p>\n

\u5de5\u4f5c\u718a\u5728\u4e4b\u524d\u7684\u6587\u7ae0\u66fe\u7d93\u63d0\u904e\u516c\u53f8\u7684\u7522\u54c1\u56e0\u70baENIG\u677f\u7684\u6d78\u91d1\u539a\u5ea6\u4e0d\u8db3\u800c\u9020\u6210\u5316\u93b3\/\u7121\u96fb\u934d\u93b3(Electroless Nickel)\u6c27\u5316<\/a>\uff0c\u751a\u81f3\u9020\u96f6\u4ef6\u7684\u710a\u63a5\u5f37\u5ea6\u4e0d\u8db3\u81f4\u96f6\u4ef6\u6389\u843d\u7684\u554f\u984c\u3002\u4e0d\u904e\u5728\u8a31\u591a\u7684\u6587\u737b\u53ca\u8cc7\u6599\u8a18\u8f09\u88e1\u90fd\u8aaa\u660e\uff0c\u91d1\u5c64\u5728\u96fb\u8def\u677f\u8868\u9762\u8655\u7406\u7684\u89d2\u8272\u53ea\u662f\u4f5c\u70ba\u7a7a\u6c23\u7684\u9694\u7d55\u5c64\uff0c\u7528\u4f86\u4fdd\u8b77\u5176\u4e0b\u9762\u7684\u93b3\u5c64\u4e0d\u81f3\u65bc\u6c27\u5316\u800c\u5df2\uff0c\u91d1(Au)\u5728\u710a\u932b\u4e2d\u7684\u975e\u4f46\u7121\u6cd5\u5f62\u6210\u5f37\u58ef\u7684\u710a\u63a5\uff0c\u53cd\u800c\u6703\u5f62\u6210AuSn\u53caAuSn2<\/sub>\u7b49\u8106\u5f31\u7684IMC\u800c\u9020\u6210\u91d1\u8106\u7684\u5f8c\u679c\u3002<\/font><\/p>\n

\u5efa\u8b70\u5ef6\u4f38\u95b1\u8b80\uff1aENIG\u8868\u9762\u8655\u7406PCB\u710a\u588a\u7684\u5169\u5927\u6f5b\u5728\u554f\u984c(\u9ed1\u93b3\u8207\u5bcc\u78f7\u5c64)\u53ca\u9810\u9632\u63aa\u65bd<\/a><\/p>\n

\u5176\u5be6ENIG\u677f\u5b50\u7684\u771f\u6b63\u710a\u9ede\u61c9\u8a72\u8981\u5b8c\u5168\u751f\u9577\u5728\u93b3\u5c64\uff0c\u5f62\u6210Ni3<\/sub>Sn4<\/sub>\u7684\u826f\u6027IMC\uff0c\u5982\u6b64\u624d\u80fd\u78ba\u4fdd\u710a\u63a5\u5f37\u5ea6\u3002<\/font><\/p>\n

\uff08\u5efa\u8b70\u5ef6\u4f38\u95b1\u8b80\uff1a\u4f55\u8b02IMC (Intermetallic Compound)\uff1fIMC\u8207PCB\u710a\u63a5\u5f37\u5ea6\u6709\u4f55\u95dc\u4fc2\uff1f<\/a>\uff09<\/p>\n

<\/p>\n

\uff08\u4e0b\u9762\u7684\u6587\u7ae0\u53ca\u5716\u7247\u53c3\u8003TPCA(\u53f0\u7063\u96fb\u8def\u677f\u5354\u6703)\u51fa\u7248\u7684\u300c\u96fb\u8def\u5fae\u5207\u7247\u53ca\u898f\u7bc4\u624b\u518a\u300d\uff09<\/font><\/p>\n

ENIG (Electroless Nickel Immersion Gold)<\/a>\u8868\u9762\u8655\u7406\u7684\u677f\u5b50\u5728\u9ad8\u6eab\u710a\u63a5\u7684\u77ac\u9593\uff0c\u91d1\u5c64\u5c07\u6703\u8fc5\u901f\u6eb6\u89e3\u65bc\u6db2\u614b\u932b\u4e4b\u4e2d\uff0c\u5f62\u6210AuSn\u3001AuSn2<\/sub>\u6216AuSn4<\/sub>\u7b49\u5171\u91d1(IMC)\u800c\u5feb\u901f\u812b\u96e2EN (Electroless Nickel)\u5c64\uff0c\u4e26\u8fc5\u901f\u64f4\u6563\u9032\u5165\u710a\u932b\u4e4b\u4e2d\u3002\u6240\u4ee5ENIG\u7684\u710a\u9ede\u61c9\u7576\u662f\u5b8c\u5168\u751f\u9577\u5728EN\u5316\u93b3\u5c64\u7684\u8868\u9762\uff0c\u4e00\u822c\u7684\u91d1\u5c64\u529f\u7528\u5728\u4fdd\u8b77\u93b3\u9762\u4e0d\u8981\u8207\u7a7a\u6c23\u76f4\u63a5\u63a5\u89f8\u800c\u751f\u93fd\u6c27\u5316\u800c\u5df2\u3002\u91d1\u5c64\u5982\u679c\u592a\u539a\u4e0d\u4f46\u7121\u6fdf\u65bc\u710a\u932b\u54c1\u8cea\uff0c\u800c\u4e14\u4e00\u65e6\u8d85\u904e\u710a\u9ede\u91cd\u91cf\u76843%\u6642(Au\u7684\u6bd4\u91cd\u70ba19.3)\uff0c\u53cd\u800c\u5bb9\u6613\u8b93\u300c\u91d1\u300d\u7121\u6cd5\u9806\u5229\u64f4\u6563\u9032\u5165\u710a\u932b\u4e2d\u800c\u7559\u5b58\u5728\u710a\u63a5\u4ecb\u9762\u8655\u5f62\u6210\u8106\u5f31\u7684IMC\uff0c\u5f15\u8d77\u91d1\u8106(Gold Embrittlement)\u7684\u554f\u984c\u3002<\/font><\/p>\n

\u4e0b\u9762\u56db\u5f35\u5716\u7247\u70ba\u653e\u59274,500\u500d\u7684SEM\u5716\u50cf\uff0c\u8aaa\u660e\u5728\u56de\u710a\u7210\u71b1\u91cf\u4e0d\u8db3\u7684\u60c5\u6cc1\u4e0b\uff0c\u9ec3\u91d1(Au)\u6210\u4efd\u6b63\u8981\u5f9e\u93b3\u5c64\u5206\u96e2\u878d\u5165\u710a\u932b\u4e2d\u7684\u77ac\u9593\uff0c\u7576\u96f6\u4ef6\u906d\u53d7\u5916\u529b\u885d\u64ca\u7684\u6642\u5019\u5c31\u6975\u6709\u53ef\u80fd\u5f9e\u9019\u4e00\u6574\u6392AuSn\u3001AuSn2<\/sub>\u6216AuSn4<\/sub>\u7684IMC\u8655\u88c2\u958b\u3002<\/font><\/p>\n

\"\u96fb\u5b50\u88fd\u9020\uff0c\u5de5\u4f5c\u72c2\u4eba(ResearchMFG)\u3002\u4e0b\u9762\u56db\u5f35\u5716\u7247\u70ba\u653e\u59274500\u500d\u7684SEM\u5716\u50cf\uff0c\u8aaa\u660e\u5728\u8ff4\u710a\u7210\u71b1\u91cf\u4e0d\u8db3\u7684\u60c5\u6cc1\u4e0b\uff0c\u9ec3\u91d1\u6210\u4efd\u6b63\u8981\u5f9e\u93b3\u5c64\u5206\u96e2\u878d\u5165\u710a\u932b\u4e4b\u4e2d\u7684\u77ac\u9593\uff0c\u7576\u96f6\u4ef6\u906d\u53d7\u5916\u529b\u885d\u64ca\u7684\u6642\u5019\u5c31\u6975\u6709\u53ef\u80fd\u5f9e\u9019\u4e00\u6574\u6392AuSn\u3001\u3001AuSn2\u6216AuSn4\u7684IMC\u8655\u88c2\u958b\u3002\"<\/a><\/p>\n

<\/font><\/p>\n

\u4e0b\u9762\u56db\u5f35\u5716\u5207\u7247\u986f\u793a\uff0c\u7576\u710a\u63a5\u7684\u71b1\u91cf\u4e0d\u8db3\u6216\u672a\u80fd\u6301\u7e8c\u4f9b\u71b1\u6642\uff0c\u96d6\u7136\u8584\u8584<\/sub>\u7684Ni3<\/sub>Sn4<\/sub>\u5171\u5316\u7269IMC\u5c64\u5df2\u7d93\u751f\u6210\u4e14\u710a\u7262\uff0c\u4f46\u56e0\u70baAuSn\u53caAuSn2<\/sub>\u9084\u672a\u4f86\u5f97\u53ca\u9038\u8d70\u878d\u5165\u710a\u6599\uff0c\u800c\u505c\u7559\u5728\u5171\u91d1\u4ecb\u9762\u9644\u8fd1\uff0c\u7576\u6709\u5916\u529b\u62c9\u626f\u7684\u6642\u5019\uff0c\u5c31\u5f88\u5bb9\u6613\u5f9eAuSn\u53caAuSn2<\/sub>\u65b7\u88c2\u958b\u4f86\u3002\u9019\u5c31\u662f\u70ba\u4f55ENIG\u7684\u710a\u9ede\u5f37\u5ea6\uff0c\u59cb\u7d42\u4e0d\u5982\u9285\u9762\u710a\u9ede(Cu6<\/sub>Sn5<\/sub>)\u4f86\u5f97\u66f4\u70ba\u7262\u56fa\u7684\u4e3b\u56e0\u4e4b\u4e00\u3002<\/font><\/p>\n

\"\u96fb\u5b50\u88fd\u9020\uff0c\u5de5\u4f5c\u72c2\u4eba(ResearchMFG)\u3002\u4e0b\u9762\u56db\u5716\u986f\u793a\uff0c\u7576\u710a\u63a5\u7684\u71b1\u91cf\u4e0d\u8db3\u6216\u672a\u6301\u7e8c\u6642\uff0c\u96d6\u7136Ni3Sn4\u7684\u8584\u8584IMC\u5c64\u5df2\u7d93\u751f\u6210\u800c\u710a\u7262\uff0c\u4f46\u4e5f\u6703\u56e0\u70baAuSn\u53caAuSn2\u9084\u672a\u4f86\u5f97\u53ca\u9038\u8d70\uff0c\u800c\u505c\u7559\u5728\u5171\u91d1\u4ecb\u9762\u9644\u8fd1\uff0c\u7576\u6709\u5916\u529b\u62c9\u626f\u7684\u6642\u5019\uff0c\u5c31\u5f88\u5bb9\u6613\u65b7\u88c2\u958b\u4f86\u3002\u9019\u5c31\u662f\u70ba\u4f55ENIG\u7684\u710a\u9ede\u5f37\u5ea6\uff0c\u59cb\u7d42\u4e0d\u5982\u9285\u9762\u710a\u9ede(Cu6Sn5)\u4f86\u5f97\u66f4\u70ba\u7262\u56fa\u7684\u4e3b\u56e0\u4e4b\u4e00\u3002\"<\/a><\/font><\/p>\n

\u4e0b\u9762\u5169\u5f35\u5716\u986f\u793a\uff0c\u7576\u710a\u63a5\u7684\u71b1\u91cf\u8db3\u5920\u4e14\u6301\u7e8c\u7684\u6642\u5019\uff0c\u91d1\u5c64\u5c07\u6703\u5b8c\u5168\u9038\u8d70\u878d\u5165\u5230\u710a\u6599\u4e2d\uff0c\u5f9e\u5716\u7247\u4e2d\u53ef\u4ee5\u96f6\u661f\u770b\u5230\u5c0f\u9846\u7c92\u7684AuSn\u56db\u8655\u5206\u6563\u6f02\u6d6e\u5728\u710a\u6599\u4e4b\u4e2d\uff0c\u5269\u4e0b\u7531\u932b\u93b3\u6240\u5f62\u6210\u7684IMC\uff0c\u81ea\u7136\u5c31\u53ef\u4ee5\u5f97\u5230\u4e0d\u932f\u7684\u710a\u63a5\u5f37\u5ea6\u3002\u53ef\u4ee5\u60f3\u50cf\uff0c\u5982\u679c\u6d78\u91d1\u6216\u934d\u91d1\u5c64\u592a\u539a\uff0c\u5c31\u6703\u5f62\u6210\u904e\u591a\u7684AuSn\u5171\u91d1\uff0c\u6700\u5f8c\u5c0e\u81f4AuSn\u7121\u6cd5\u6709\u6548\u9038\u8d70\u6216\u5145\u6eff\u6574\u500b\u710a\u6599\uff0c\u9032\u800c\u5f71\u97ff\u5230\u710a\u63a5\u5f37\u5ea6\u3002<\/font><\/p>\n

\"\u96fb\u5b50\u88fd\u9020\uff0c\u5de5\u4f5c\u72c2\u4eba(ResearchMFG)\u3002\u4e0b\u9762\u5169\u5716\u986f\u793a\uff0c\u7576\u710a\u63a5\u7684\u71b1\u91cf\u8db3\u5920\u4e14\u6301\u7e8c\u7684\u6642\u5019\uff0c\u91d1\u5c64\u5c07\u6703\u5b8c\u5168\u9038\u8d70\u878d\u5165\u5230\u710a\u6599\u4e4b\u4e2d\uff0c\u5f9e\u5716\u7247\u4e2d\u53ef\u4ee5\u96f6\u661f\u770b\u5230\u5c0f\u9846\u7c92\u7684AuSn\u56db\u8655\u5206\u6563\u6f02\u6d6e\u5728\u710a\u6599\u4e4b\u4e2d\uff0c\u5269\u4e0b\u7531\u932b\u93b3\u6240\u5f62\u6210\u7684IMC\uff0c\u81ea\u7136\u5c31\u53ef\u4ee5\u5f97\u5230\u6709\u4e0d\u932f\u7684\u710a\u63a5\u5f37\u5ea6\u3002\u53ef\u4ee5\u60f3\u898b\uff0c\u5982\u679c\u6d78\u91d1\u6216\u934d\u91d1\u5c64\u592a\u539a\uff0c\u5c31\u6703\u5f62\u6210\u904e\u591a\u7684AuSn\u5171\u91d1\uff0c\u6700\u5f8c\u5c0e\u81f4AuSn\u7121\u6cd5\u6709\u6548\u9038\u8d70\u6216\u5145\u6eff\u6574\u500b\u710a\u6599\uff0c\u9032\u800c\u5f71\u97ff\u5230\u710a\u63a5\u5f37\u5ea6\u3002\"<\/a><\/font><\/p>\n

Per IPC-4552 there should be 2-5 micro-inches of immersion gold applied over 120-240 micro-inches of electroless nickel. The electroless nickel is what the assembler shall be soldering to. Nickel thickness results below the range may result in gold peel and solderability issues. Nickel thickness results above the range may result in nickel cracks and solder joint failure. <\/font><\/p>\n

The immersion gold is only there to prevent the nickel from oxidizing. The gold is absorbed into the solder joint adding no benefit. The immersion gold is a porous surface. Gold thickness results below the specified range shall result in insufficient oxidation resistance for the nickel. <\/font><\/p>\n

Gold thickness results above the specified range shall result in an attack on the nickel itself. The nickel may corrode and ultimately result in black pad if aggressive enough. The thicker the gold the greater the risk for black pad.<\/font><\/p>\n

\u4f9d\u64daIPC-4552\u7684\u8981\u6c42\u4e00\u822c\u5316\u91d1\u5c64\u7684\u539a\u5ea6\u5efa\u8b70\u57282\u00b5"\uff5e5\u00b5"\uff0c\u5316\u5b78\u93b3\u5c64\u57283\u00b5m(118\u00b5")\uff5e6\u00b5m(236\u00b5")\u3002IPC-6012(Rigid)\u8981\u6c42\u91d1\u539a\u6700\u5c111.97\u00b5"\uff0c\u93b3\u539a118\u00b5"\u4ee5\u4e0a\uff1bIPC-6012(Flex, Rigid-Flex)\u8981\u6c42\u91d1\u539a\u6700\u5c111.58\u00b5"~3.94\u00b5"\uff0c\u93b3\u539a118\u00b5"\uff5e236\u00b5"(Rigid)\u820750\u00b5"\uff5e236\u00b5"(Flex)\u3002\u4e0d\u904e\u5c0d\u65bc\u710a\u932b\u4f86\u8aaa\u91d1\u5c64\u8981\u8d8a\u8584\u8d8a\u597d\uff0c\u4ee5\u514d\u9020\u6210\u91d1\u8106\u8207\u53cd\u5411\u8150\u8755\uff0c\u56e0\u70ba\u300c\u91d1\u300d\u5728\u710a\u63a5\u904e\u7a0b\u4e2d\u662f\u53ef\u4ee5\u88ab\u5ffd\u7565\u7684\u5143\u7d20\uff1b\u4f46\u662f\u91d1\u5c64\u5982\u679c\u592a\u8584\uff0c\u5c31\u7121\u6cd5\u5b8c\u5168\u8986\u84cb\u4f4f\u93b3\u5c64\uff0c\u6210\u54c1\u5b58\u653e\u7684\u6642\u9593\u4e00\u4e45\u8981\u518d\u62ff\u51fa\u4f86\u710a\u63a5\uff0c\u5c31\u5bb9\u6613\u51fa\u73fe\u6c27\u5316\u800c\u6709\u62d2\u710a\u7684\u73fe\u8c61\uff0c\u6240\u4ee5\u300c\u91d1\u300d\u7684\u76ee\u7684\u5728\u9019\u88e1\u6700\u4e3b\u8981\u5728\u9632\u6b62\u96fb\u8def\u677f\u6c27\u5316\u3002 <\/font><\/p>\n

\u5de5\u4f5c\u718a\u5728\u53e6\u5916\u4e00\u7bc7\u6587\u7ae0<\/a>\u4e2d\u4e5f\u8aaa\u904e\uff0c\u56e0\u70ba\u91d1\u50f9\u5927\u6f32\uff0c\u6210\u672c\u8003\u616e\u4e0b\u6211\u5011\u516c\u53f8\u4e4b\u524d\u6709\u5c07\u91d1\u7684\u6700\u4f4e\u539a\u5ea6\u964d\u52301.2u"\uff0c\u4f46\u5176\u4fdd\u5b58\u671f\u9650\u5927\u6982\u6703\u7e2e\u77ed\u4e00\u534a\uff0c\u800c\u4e14\u9084\u8981\u78ba\u5be6\u91cf\u6e2c\u5927\u9762\u7a4d\u8655\u7684\u91d1\u539a\uff0c\u56e0\u70ba\u5927\u710a\u588a\u7684\u91d1\u539a\u901a\u5e38\u6703\u6bd4\u8f03\u8584\uff0c\u800c\u4e14\u9019\u6a23\u7684\u8b8a\u52d5\u6700\u597d\u53ea\u7d66\u90a3\u4e9b\u6c92\u6709\u4f5c\u70ba\u6309\u9375\u6216\u662f\u63a5\u89f8\u4f7f\u7528\u7684PCB\u3002\u81f32022\u5e74\u5df2\u57f7\u884c\u4e86\u5927\u6982\u670910\u5e74\uff0c\u671f\u9593\u96d6\u7136\u5076\u6709\u54c1\u8cea\u554f\u984c\uff0c\u6bd4\u5982\u9001\u5230\u5ba2\u6236\u624b\u4e0a\u7684PCBA\u90e8\u4efd\u767c\u751f\u6c27\u5316\uff0c\u4f46\u90a3\u5927\u591a\u5c6c\u65bc\u4eba\u70ba\u7d00\u5f8b\u554f\u984c\uff0c\u800c\u6c92\u6709\u767c\u751f\u4ec0\u9ebc\u91cd\u5927\u54c1\u8cea\u554f\u984c\u3002<\/font><\/p>\n

\n

\u5ef6\u4f38\u95b1\u8b80\uff1a<\/font>
\u9023\u63a5\u5668\u4f7f\u7528\u4e00\u6bb5\u6642\u9593\u5f8c\u6389\u843d\u554f\u984c\u63a2\u8a0e<\/font><\/a>
\u5982\u4f55\u5224\u65b7BGA\u6389\u4ef6\u662fSMT\u5de5\u5ee0\u88fd\u7a0b\u6216\u662f\u8a2d\u8a08\u554f\u984c?<\/font><\/a>
\u7528\u6ef2\u900f\u67d3\u7d05\u8a66\u9a57 (Red Dye Penetration Test)\u67e5\u770bBGA\u710a\u932b<\/font><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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