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Help fixing a cracked/ detached "ceramic heat-pad".
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Dan R. Hansen:
Hi.

Anyone here who know how to fix such a mess:

I was drilling some holes into a heatsink, and made a last second change to where the last hole would go. As it turned out, it ended up being right next to a mosfet, but still under this hard type of thermal interface. I do not know what this thermal pad material is called, but it's hard hard and brittle, like ceramic or something. Not only did it crack, but it also dethatched from the aluminum surface. In my infinite wisdom, I made a half-assed attempt to "glue" it back with some Loctite 243 I had on hand. I know after some thought, that this is stupid on the base alone of Loctite losing adhesion when getting hot and it's poor thermal properties.

I just don't know if there is actually anything I can do to make it stick again, or if I have to chip it of and use a thermal pad etc?


Cheers from Denmark.
BrokenYugo:
Well, they probably didn't grow it on there. I think what you're after is a "thermal adhesive", thermally conductive epoxy or whatever, minding that electrical insulation must be maintained. Make sure that crack gets filled.

Loctite 243 is an anaerobic threadlocker, not a general purpose glue, clean that out.
Wallace Gasiewicz:
Loctite 383 Output Thermally Conductive Adhesive
Dan R. Hansen:

--- Quote from: BrokenYugo on March 18, 2022, 07:48:13 pm ---Well, they probably didn't grow it on there. I think what you're after is a "thermal adhesive", thermally conductive epoxy or whatever, minding that electrical insulation must be maintained. Make sure that crack gets filled.

Loctite 243 is an anaerobic threadlocker, not a general purpose glue, clean that out.

--- End quote ---

I understand that, I just made a late night brain fog mistake of desperation... Do you know how to remove it without damaging component and the PCB?


--- Quote from: Wallace Gasiewicz on March 18, 2022, 09:56:34 pm ---Loctite 383 Output Thermally Conductive Adhesive

--- End quote ---

Interesting. I hope it can bind to the surface the brittle pad left behind? Because the Loctite 243 didn't stick at all, and all it did was contaminate the surfaces...
BrokenYugo:
I would think desolder the transistor+chunk of probably alumina, then clean up, glue with appropriate glue and clamp, resolder after glue cures. Not sure what solvent to use for cleaning uncured loctite, maybe acetone used sparingly on a q tip.
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