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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Vladimir Igoshev <[log in to unmask]>
Date:
Thu, 10 Dec 2015 09:23:02 -0800
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I'm not worried about that particular one. There are 3 major in the spectrum, even though there are overlappings and not just with Ca

Vladimir

---- On Thu, 10 Dec 2015 06:01:11 -0800 Bhanu Sood<[log in to unmask]> wrote ---- 
 > Not sure why a Sn label appears at 0.3keV?? 
 >  
 > As you know, there exist more than a few peak overlaps and Sn-Ca is 
 > classic, fyi.. CaKα 3.7keV, CaLα0.3, SnLα 3.4 
 >  
 > I recommend a rescan point and ID, much higher mag, and increase your 
 > accelerating voltage so you can look at binding energies in 10keV+ range.. 
 >  
 > Bhanu 
 >  
 >  
 >  
 > On Wed, Dec 9, 2015 at 7:55 PM, Vladimir Igoshev <[log in to unmask] 
 > > wrote: 
 >  
 > > No underfill or any other fancy stuff 
 > > 
 > > ---- On Wed, 09 Dec 2015 16:53:28 -0800 Yuan-chia Joyce Koo< 
 > > [log in to unmask]> wrote ---- 
 > >  > tin oxalyate used for epoxy catalyst... there were works for flux/ 
 > >  > underfill one step stuff utilize flux by product as catalyst for 
 > >  > curing... (can't remember which group did that...) 
 > >  >           jk 
 > >  > 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 
 > >  > >>>>> 
 > >  > >>>>> 
 > >  > >>>>> __________________________________________________________________ 
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 >  
 >  
 >  
 > --  
 > Bhanu Sood 
 > Tel: (202) 468-8449 
 >  
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 > 


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