non conductive high temperature structural material for induction heating fixture

[Tmoose]

Good morning,

We need to hold some tungsten carbide plates/tiles ( roughly 1" square, less than .25" thick ) in position on a two pound steel part when heated for silver brazing . Possibly to 1500° F.

I'm picturing a springy finger bearing gently against the tiles.

Any metallic spring would likely get real hot during the brazing process and wilt.
I'm wondering what easily available materials would stay cool and be fairly rugged to survive hundreds of uses and shop handling.

thanks,

Dan T

 

[MintJulep]

Apparently it's possible to wind springs from fused quartz tube.

 

[DAVIDSTECKER]

From what I'm told, our 35,000 Watt Miller induction heaters will not affect stainless steel or aluminium directly.
I wouldn't think that you'd be at your 1500 deg long enough for too much heat to transfer into your holding parts.

 

[EdStainless]

David, I find that hard to believe, we melt SS with induction.

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P.E. Metallurgy, consulting work welcomed

 

[BrianE22]

Mycalex MM1600 would handle the temperature. We used to use other Mycalex products years ago in compression and they were fairly strong:

https://www.professionalplastics.com/professionalplastics/MycalexDataSheets-Feb2010.pdf

 

[dik]

I think the SS has to be ferritic... for induction to work.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[DAVIDSTECKER]

EdStainless; I would have thought so too, but from what was told it has something to do with frequency of the output.
We're using Miller Proheat 35 units.
Stupid crazy power out them.

 

[EdStainless]

The frequency will impact the efficiency of the coupling, but if it will conduct electricity then eddy currents will form and it will heat.

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P.E. Metallurgy, consulting work welcomed

 

[mfgenggear]

Most brazing I got involved with was vacuum furnaces. Stainless and carbon fixtures

 

[btrueblood]

When working at Rocketdyne, we had a lot of sequential brazing processes in the assembly of the combustion devices - a lot of staged brazing with very slight differences (as little as 100F in some cases) in the melt temp range of the braze alloys used. Also the remelt temperature of the previously brazed joint would typically be higher than the original alloy, due to mixing with the base metals, so there was a bit of room for error. So, for the tricky part with tiles at 90 degrees, braze the first tile in the "up position with a 1100F alloy, then turn the part and braze second tile with a 900F alloy, or whatever temps work. Our metallurgist would custom vacuum melt some braze alloys to get the melt points he wanted.

 

[Tmoose]

thanks all,

Dan T

 

[Samwu120]

Our phlogopite sheets or tubes are insulated and resistant to high temperature 1500°, samples can be provided for you to test the quality.

https://highmica.com/