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August 2010

TGAsia@IPC.ORG

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Subject:
From:
Leesha Peng <[log in to unmask]>
Reply To:
Asia Committe Task Group Forum <[log in to unmask]>, Leesha Peng <[log in to unmask]>
Date:
Tue, 31 Aug 2010 04:24:09 -0500
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积极响应!



Best Regards



Leesha Peng 彭丽霞☺

General Manager 总经理,IPC China

上海市谈家渡路28号盛泉大厦16AB

Suite 16AB, #28 Tan Jiadu Rd., Shanghai 200063 PRC

Tel: +86 21 54973435

Fax:+86 21 54973437

MP: 13902994705

[log in to unmask]

www.ipc.org.cn



________________________________

发件人: [log in to unmask] [[log in to unmask]]

发送时间: 2010年8月31日 17:21

收件人: Charlotte "Yu" Hao; Leesha Peng; James Liu; Listserv TGAsia

主题: 转发: 各位,昨天与业界专家李宁成博士沟通后,整理的几条意见,贾总帮忙看看有无需要更改的地方,供大家参考。谢谢!





彭老师,郝老师,刘老师,3位好,



    由于无铅焊点长期可靠性的问题,目前通讯业界无铅元件有铅焊已经成为一个长期不可避免的现状,中兴通讯仅代表通讯业界,提议IPC标准增加无铅元件有铅焊接的混装工艺规范(在IPC/JEDEC J-STD-020E版本中),中兴通讯愿意为此参与实验验证。

    不知各位意见如何?



等待各位老师的好消息!

谢谢!

[cid:_2_077499D407749564003368C348257790]



Bianfen Jia 贾变芬

PCBA Manufacture Process Dept.

[cid:_2_0774B9480774B720003368C348257790]       Supply Chain System

物流体系

7/F, Jinzheng Plaza, Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, P.R.China, 518057, Tel:+86-755-26772902

MP:+86-13316972235

E-mail:[log in to unmask]









----- 转发人 贾变芬006419/user/zte_ltd 时间 2010-08-31 17:05 -----

朱良峰139929/user/zte_ltd



2010-08-31 08:50





收件人

        贾忠中103276/user/zte_ltd, 黄盛强168414/user/zte_ltd, 马宁伟138874/user/zte_ltd, 张星炜163549/user/zte_ltd, 阮春郎144358/user/zte_ltd, 刘辉007848/user/zte_ltd, 董四海101482/user/zte_ltd, 杨耀中144197/user/zte_ltd, 贾变芬006419/user/zte_ltd, 苏鹏104192/user/zte_ltd

抄送



主题

        各位,昨天与业界专家李宁成博士沟通后,整理的几条意见,贾总帮忙看看有无需要更改的地方,供大家参考。谢谢!













[cid:_1_11906BEC119069C4003368C348257790]

李宁成博士的几个观点:



1、关于混装工艺无标准:混装工艺并非不可用,在业界已经在大量使用,通讯行业更是不得不用。IPC为何没有做出规定,主要的原因是混装工艺比较复杂,影响因素很多,因此IPC标准没有对此进行规定。



2、看完五所的报告后给出的结论:认为断裂与IMC厚有关系,与出现Cu3Sn的关系应该不大(Cu3Sn的出现是因为IMC生产过厚一定会产生的)。

                             建议我们与供方沟通,要求供方控制制程工艺,将IMC的厚度控制在3um以下。



3、对于OSP的表面处理的工艺,IMC应该比浸Tn的薄。SOP这种工艺,他没有听过。



4、IMC与过炉的次数是平方根的关系,对可靠性影响不是很大。高低温循环会加速IMC生长,影响更大一点。



5、如何解决或者缓解:(1)换成有铅的芯片应该可以解决这个问题

                    (2)采用4角点胶的方式,如果实验结果有效即可,如无效建议采用底部全部填充胶水的方式加固。胶水的型号要注意选择。

[cid:_2_1190A0E411909B94003368C348257790]



Liangfeng Zhu 朱良峰

PCBA Manufacture Process Dept.

[cid:_2_1190C0841190BE5C003368C348257790]       Supply Chain System

物流体系

7/F, Jinzheng Plaza, Keji Road South,

Hi-Tech Industrial Park, Nanshan District, Shenzhen,

P.R.China, 518057

Tel:+86-755-26772914

Fax:+86-755-26771091

MP:+86-13480643595

E-mail:[log in to unmask]











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