Ceramic pcb evaluation project brainstorming

[coppercone2]

i wonder if you can use warm bee wax or something. I have a special paste for cast iron pans that is like a thick paste at room temperautre, it should work OK if I mix it on the hot plate

[coppercone2]

I tried again to 940C with over night cooling.

The F69, which I had high hopes for, was really brittle and kinda popped off.

3124 (strontium flux) failed, 284M kinda worked, F38 seems to be the best candidate, and 3124 works too.. but it was in lump form. One of the lumps really stuck on the ceramic well.

The F69 residue that did not come off does not appear to be conductive.


But all of them are in the mega ohm range. I need to try formulations with less frit in them.... but unless its pretty non linear, this won't be good for PCB resistors unless you want the megaohm range. But maybe you can make a ceramic cylinder resistor.... I think it could make a lower value through hole or MELF type resistor.

My test was kind of plowing it with a stainless steel spatula (pretty aggressive)