Author Topic: Ultra-High Temperature Carbon Fiber for Drones/Rockets  (Read 970 times)

Patrick

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Ultra-High Temperature Carbon Fiber for Drones/Rockets
« on: March 14, 2022, 11:02:49 PM »
I need you guys to check my "crazy factor" on this one.

I've been looking at high speed aircraft and rockets or jets and the areas that normally are just too hot from traditional fiberglass or carbon. Typically epoxy or polyester doesn't survive much past 450 degrees. The carbon and glass fibers themselves certainly will, but with a damaged matrix the fibers just go limp and the structure collapses, not ideal at Mach 2.2 in the mid-atmosphere.

So my mind jumped to intumecents used in buildings for fire protection while "Integza" was able to make a carbon fiber tube for a pulse jet https://www.youtube.com/watch?v=hk-fXjkV0ho I began to see issues with long term structure and repeatable builds using the gray intumecent method seen below.

With that background I came up with a solution using a carbon fiber and water-glass matrix.  I guess Ill call it CF-Na2SiO3 i dont know what other formal notation would be used.

But the method involves layers of the common CF layed up in the desired shape then wet out with water-glass solution of Na2SiO3. The following pictures show the initial prototype sample.
I have a thermocouple up to 1800 degrees F and a ring stand waiting. There have been some failures, those are seen below too.

So any thoughts on my crazy idea ?

UPDATE: The clear soda glass CF is physically dry, but softish. I'm going to heat it with a thermocouple and report back.




« Last Edit: March 14, 2022, 11:05:04 PM by Patrick »

Offline Twospoons

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Re: Ultra-High Temperature Carbon Fiber for Drones/Rockets
« Reply #1 on: March 15, 2022, 05:14:03 AM »
You might want to look into phosphate bonded ceramics as a binder, if the sodium silicate doesn't perform. Also polyimide resins are commonly used as a high temperature binder - though obviously more expensive than silicate.  Between polyimide and epoxies there's also phenolic resin - which is thermosetting I believe.

You  might do better posting this at https://www.sciencemadness.org/whisper/  

Offline rikkitikkitavi

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Re: Ultra-High Temperature Carbon Fiber for Drones/Rockets
« Reply #2 on: March 15, 2022, 10:02:47 AM »
Wasn't thermosetting phenolic resins early adaptations of ablation shields on reentry vessels.
Tougher than that, I Dont know what is?
Perhaps the pusher plate on the Orion starship.
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Re: Ultra-High Temperature Carbon Fiber for Drones/Rockets
« Reply #2 on: March 15, 2022, 10:02:47 AM »

 


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