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October 2008

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From:
"Joe Lara (Select Circuits)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joe Lara (Select Circuits)
Date:
Wed, 1 Oct 2008 15:19:13 -0400
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Ive heard of them (Epoxies)?but was unsure if their product would work for our application.
I'll give it a shot!


Joe 



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-----Original Message-----
From: Phil Nutting <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, 1 Oct 2008 12:01 pm
Subject: Re: [TN] "Conductive" Bonding Material



We have used some silver filled epoxy from Epoxies, Etc. for several 
applications, but these were low volume low stress.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: Wednesday, October 01, 2008 2:44 PM
To: [log in to unmask]
Subject: Re: [TN] "Conductive" Bonding Material

Joe,

Most/all of what I spoke of was for hermetic applications as far as
reliability, so it was likely way off-base for your question - sorry.

I don't have as good a feel for non-hermetic applications.  All the
commercial/industrial stuff I had exposure to was doing good to last
5-10 years in an industrial environment - is my guess.

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: Wednesday, October 01, 2008 2:34 PM
To: [log in to unmask]
Subject: Re: [TN] "Conductive" Bonding Material

Joe,

The short answer is, "Yes"

The hybrid industry has used conductive adhesives to bond Pd/Ag, Ag, and
Au terminated chip components to thin and thick film metallized alumina
substrates for at least 30+ years.

Samples are on board Voyagers I & II, Cassini, B1, F22, Tomahawk, etc.
etc. pacemakers, implanted insulin pumps, left ventricular assist heart
pumps, and a whole slew of others ....  If done right, the reliability
is certainly there.  As Dewey says, "It depends".

I am not aware of a 'hybrid guy' attempting to conductively adhesive
bond to solder terminated components, or substrates reliably.  That
configuration has pretty much always ultimately fallen apart for me, but
you may get away with it in a low cost, low rel commercial application.

Both Henkel and Emerson & Cuming [now one large organization,
technically] have multiple silver filled conductive adhesives that may
potentially be of use to you.  Ablestik is still there under the E&C
umbrella for generic applications.

You could talk to you local sales eng to flesh out your needs.



It would help if you could narrow down the field a bit more.

What is the application [Mil, 
Space, Commercial, etc], and type of
conductor on the ceramic [thick film, thin film, plated, tinned, etc.]
and nature of components to be attached Pd/Ag terminated chip cap/res,
solder coated chip cap/res?  Temp limitations?  Environmental testing?
Chemical resistance?  Dispense/screen/stencil?

The "conductive' bonding material" could be anything from conductive
adhesive to solder - depending upon your components and circuit
metallizations  :-)



Steve


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Lara (Select
Circuits)
Sent: Wednesday, October 01, 2008 2:03 PM
To: [log in to unmask]
Subject: [TN] "Conductive" Bonding Material

Good Morning / Afternoon Tech Net Guru's,

Has anyone used a "Conductive" bonding material on a ceramic circuit
board?
If so what material was used and what was the quality of the result.



Thanks in advance!

Joe


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