Thank you Mike
---- On Thu, 10 Dec 2015 05:03:38 -0800 Mike Fenner wrote ----
>I have seen something similar before with Sn/Ag solders and also high leads,
>both in die attach applications with longish reflow cycles.
>Whether that's relevant or coincidence couldn't say. Thought it could beat
>the time.
>The Sn one may be the same as here. Then the analysis reported only Sn, but
>the reporter may have dismissed any O (and C and H etc) as background from
>laminate. I'm not sure the cause was ever identified but am sure it was a
>long time ago. I will have to go back through some archived stuff and hope I
>can find something.
>
>--
>Regards
>
>Mike
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
>Sent: Thursday, December 10, 2015 12:53 AM
>To: [log in to unmask]
>Subject: Re: [TN] What else it can be
>
>It varies
>
>---- On Wed, 09 Dec 2015 16:44:26 -0800 Yuan-chia Joyce Koo wrote ----
>>where is the origin of the pwa? (country of origin).
>>On Dec 9, 2015, at 7:03 PM, Vladimir Igoshev wrote:
>>
>>> Hi Dave,
>>>
>>> Not really. It doesn't "burn" or "curl" much under the beam, so
>>> it's solid.
>>>
>>> Vladimir
>>>
>>> ---- On Wed, 09 Dec 2015 15:51:29 -0800 David
>>> Hillman<[log in to unmask]> wrote ----
>>>> Thank you Steve!
>>>>
>>>> Vlad - does the substance slightly charge in the SEM?
>>>>
>>>> Dave
>>>>
>>>> On Wed, Dec 9, 2015 at 5:46 PM, Steve Gregory <[log in to unmask]>
>>>> wrote:
>>>>
>>>>> Hi Dave and Vlad,
>>>>>
>>>>> I have it up here:
>>>>>
>>>>> http://stevezeva.homestead.com/What_else_it_can_be.pdf
>>>>>
>>>>> Steve
>>>>>
>>>>> On Wed, Dec 9, 2015 at 4:34 PM, David Hillman <
>>>>> [log in to unmask]> wrote:
>>>>>
>>>>>> HI Vlad - we can't open Dropbox here due to firewall
>>>>>> restrictions so can
>>>>>> you have Steve G. post the pictures?
>>>>>>
>>>>>> Dave Hillman
>>>>>> Rockwell Collins
>>>>>> [log in to unmask]
>>>>>>
>>>>>> On Wed, Dec 9, 2015 at 4:59 PM, Vladimir Igoshev <
>>>>>> [log in to unmask]
>>>>>>> wrote:
>>>>>>
>>>>>>> HI everyone,
>>>>>>>
>>>>>>> I'm attaching a link to a file showing something I'd appreciate
>>>>>>> your
>>>>>>> thoughts on. It's a cross-section of a QFN on an IAg board;
>>>>>>> Pb-free/no-clean process. As you can see from the EDS spectrum,
>>>>>>> that
>>>>>>> greyish stuff between pins has pretty much only Sn and O in its
>>>>>> elemental
>>>>>>> composition.
>>>>>>>
>>>>>>> I know there is burn flux residue around solder joints but that
>>>>>>> stuff
>>>>>>> doesn't have any C in it. The question I have is what is it.
>>>>>>>
>>>>>>> I spoke to Bev and both of us are still puzzled.
>>>>>>>
>>>>>>> Here is the link:
>>>>>>>
>>>>>> https://www.dropbox.com/s/3wbj62vqjyhvj2y/What%20else%20it%20can%
>>>>>> 20be.pdf?dl=0
>>>>>>>
>>>>>>> Thank you very much in advance.
>>>>>>>
>>>>>>> Regards,
>>>>>>>
>>>>>>> Vladimir
>>>>>>>
>>>>>>> SENTEC
>>>>>>>
>>>>>>>
>>>>>>> __________________________________________________________________
>>>>>>> ____
>>>>>>> This email has been scanned by the Symantec Email Security.cloud
>>>>>> service.
>>>>>>> For more information please contact helpdesk at x2960 or
>>>>>> [log in to unmask]
>>>>>>> __________________________________________________________________
>>>>>>> ____
>>>>>>>
>>>>>>
>>>>>>
>>>>>> ___________________________________________________________________
>>>>>> ___
>>>>>> This email has been scanned by the Symantec Email Security.cloud
>>>>>> service.
>>>>>> For more information please contact helpdesk at x2960 or
>>>>>> [log in to unmask]
>>>>>> ___________________________________________________________________
>>>>>> ___
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> This email and any attachments are only for use by the intended
>>>>> recipient(s) and may contain legally privileged, confidential,
>>>>> proprietary
>>>>> or otherwise private information. Any unauthorized use,
>>>>> reproduction,
>>>>> dissemination, distribution or other disclosure of the contents
>>>>> of this
>>>>> e-mail or its attachments is strictly prohibited. If you have
>>>>> received this
>>>>> email in error, please notify the sender immediately and delete the
>>>>> original.
>>>>>
>>>>
>>>>
>>>> _____________________________________________________________________
>>>> _
>>>> This email has been scanned by the Symantec Email Security.cloud
>>>> service.
>>>> For more information please contact helpdesk at x2960 or
>>>> [log in to unmask]
>>>> _____________________________________________________________________
>>>> _
>>>>
>>>
>>>
>>>
>>> ______________________________________________________________________
>>> This email has been scanned by the Symantec Email Security.cloud
>>> service.
>>> For more information please contact helpdesk at x2960 or
>>> [log in to unmask]
>>> ______________________________________________________________________
>>
>>
>>______________________________________________________________________
>>This email has been scanned by the Symantec Email Security.cloud service.
>>For more information please contact helpdesk at x2960 or [log in to unmask]
>>______________________________________________________________________
>>
>
>
>______________________________________________________________________
>This email has been scanned by the Symantec Email Security.cloud service.
>For more information please contact helpdesk at x2960 or [log in to unmask]
>______________________________________________________________________
>
>
>______________________________________________________________________
>This email has been scanned by the Symantec Email Security.cloud service.
>For more information please contact helpdesk at x2960 or [log in to unmask]
>______________________________________________________________________
>
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
|
