Have you considered Titanium bolts, I believe they have a similar

co-efficient to aluminium
George ( down under)

That is a real good idea.

Paul Lamar

Paul, We talked about this some time ago, I still like the idea.
Ti bolts with a belleville washer stack to prevent bolt stretch.
Bill Jepson

It's great to hear from Allan here. Remind me to ask him what 'furnace
brazing' means. I believe he has a point about creepage.
It may be irrelevant but several years ago when my company was testing
stacks of alkaline fuel cells we had similar problems. We tried all sorts of
different and stronger  bolts to no availed. They still seeped.

Finally we them keyed together and used long thin stainless rods with 4
Belleville springs each to keep the same tension as it heated up. Problem
solved.  Perhaps a combination of titanium and springs might be the ticket
for the rotary.

Doug in Japan

 
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