anyone have any info on availability of ceramic or polymer type resins for use in the construction of exhaust tuned pipes for small gas engines (handle 1400 deg F exhaust gas flow). Mainly interested in low thermal conductivity. I have come across a few things but the companys dont want to bother unless I’m gonna spend millions or the processing is too complex. have found some ceramic type adhesives and puttys that seem simple. Just looking for more info/sources/options. any input would be helpful
Starfire systems has a polyramic system. Takes 1 part, mix it with a peroxide cataylst, and you should be able to cure it to a either a B prepreg stage, or hard cure it into a composite, after that, it gets fired in an inert atm, and then converts to a ceramic. Also Clariant (I think) HT1800, which is almost the same, but is a 1 part liquid solids. Again, most things have to be fired under N2 or Ar or something, NOT air, or it will oxidize.
However, Rescor castible ceramics are almost a cement style system, where you can fire it in air. However, this is like a cement, so you can’t infuse it like a resin. Good for coatings. You can also add basalt, or other structure fibers (Carbon fiber i’m sure too), to add strength.
Depending on what you are actually doing, Rescor from http://cotronics.com/ is the easiest, next is Starfire Systems, and the Clariant system is FKING HELL and EVIL. Outgases ammonia and the can, even when purged with N2, will pressurize. Smells like the devil’s den…
Did you have anything to do with coming up with the system to repair shuttle heat tiles in space? You seem to know a bit about the stuff.
Nope, the shuttle was before my time 
I work on Rxxx xxxs, not the shuttle. Both of which may see hot temps, and plasma, but the shuttle sees it for a LONG time more.
But, there are also reasons why you only see metal on exhaust pipes…nothing else can really take the heat, and still be light. Titanium is the way to go, then you can at least make the muffler out of composites.
Just thought of something. Carbon will oxidize at those temps, which means you loose mass and obviously properties. Be careful on your design.
Sorry for the late reply. Off on a tangent
A metal length of header leading to a BMI/Carbon pipe is currently being used (obviously less than 1400deg that far back)and is borderline survival in this application but is light weight with very low thermal conductivity. Weight is a factor. I will investigate the above to see if its cost effective. thanks for the replys
One thing I’ve learned in figuring out how to start making a part, is temp requirements
I found this company awhile back. Never used their stuff, but kept it incase I needed high temp stuff. Homide 400 from HOS - Technik. shrugs