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March 2003

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Subject:
From:
"Shoda, Steve" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 20 Mar 2003 17:00:07 -0500
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Does anyone have any experience bonding ferrite cores?  I am working on
developing a process for bonding an e-core to an i-core. They are 0.8" x
1.2" and sandwich the winding in the pwb. So the bond must be done once the
assembly is populated.   I'm applying a high viscosity epoxy, but it can be
difficult to control.  I attempted a 0.002" epoxy preform, but the outcome
was reduced inductance, so we are still using the high viscosity epoxy.  Why
would they result in such different inductance properties?   In either case,
the cure time at 250°F is 1 hour and production is requesting a material
which has a very short cycle time.

Steve Shoda
BAE SYSTEMS Controls

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