Hi Ido,
I cannot view the http site to which you have linked.
I get the following message:
"Free users cannot publish folders, files or web pages. Folders published by free users are for preview only; they will expire in 20 minutes.
It is a DriveHQ standard policy to only allow "trusted" users to publish. This is to prevent "bad" users from publishing inappropriate contents. Free users are not considered trusted. A free user can upgrade to True User or Premium (Paid) User. To become a True user, you must register your account with a private domain company email address, or deposit at least $3 into your DriveHQ account."
I guess your 20 minutes are up and the picture are removed.
Usually we ask Steve Gregory to post TechNet pics on his site stevezeva.homestead.com. Can you send the pictures to Steve ([log in to unmask]) and ask him to post the pictures on his site so we can all view them?
Lead/free 260°C assembly produces a different type of barrel and corner crack than tin/lead 230°C. A 288°C float may be showing these somewhat unique failure modes.
Change in crack morphology may be a results of Cu bath contamination, brightener and chemistry maintenance, electrical properties (RMS ripple, racking, bussing, pulse etc) but material may also play a role in lead/free applications. Grid size is another variable that is expressing different failure modes in lead/free applications.
If I can view the 288°C induced corner and barrel cracks I will gladly comment on them.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ido Mashall
Sent: Friday, October 03, 2008 2:13 PM
To: [log in to unmask]
Subject: [TN] Barrel and Corner cracks in copper elctroplating
Hello technet
We are suffering a serious problem of barrel and corner cracks in the pattern copper plate bath.
Please look at the following pic. (all after 288C solder thermal stress)
http://www.drivehq.com/file/df.aspx/shareID4765976/fileID233954134/eo-d3497-
1.jpg
http://www.drivehq.com/file/df.aspx/shareID4765976/fileID233954135/es-c9633-
1.jpg
http://www.drivehq.com/file/df.aspx/shareID4765976/fileID233954138/as-d3715.
jpg
This very strange phenomenon occurs only in the second copper, and does not occur in the panel plated copper.
After testing all bath components, they seem to be ok. CVS is oK, hull cell is OK. It seems the copper lost its mechanical properties.
We are looking for possible contamination and changed the bath for a new fresh bath, and it happens again after a few days..
Does somebody have some idea why this cracks can occur? What other reasons..?
Thanks.
Ido Mashall
Fax: +972-4-6376666, Tel: +972-77-2127172,
Mobile +972-52-5901114, http://www.beyond-materials.com/index-en.htm
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