Ceramics

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ace_fedde
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Ceramics

Post by ace_fedde » Sun Sep 11, 2011 10:02 am

Hello all,

Since every once in a while somebody asks or writes something about ceramics, I thought it was time for a central topic about this theme.
Mike, can you make it a sticky one?

Fedde
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ace_fedde
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Re: Ceramics

Post by ace_fedde » Sun Sep 11, 2011 10:03 am

In Odds and ends Mark wrote:I just noticed Resbond 940LE might be a good candidate to use with my quartz tubing, There aren't many materials that have a lower thermal expansion rate that quartz/SiO2. Think about a spark plug having metal and ceramic in a tight fit together. They would have to expand at roughly the same rate I should think. I remember cracking a spark plug just dropping it on the floor.
http://www.cotronics.com/vo/cotr/pdf/940.pdf
http://www.cotronics.com/vo/cotr/pdf/940%20LE.pdf
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ace_fedde
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Re: Ceramics

Post by ace_fedde » Sun Sep 11, 2011 10:05 am

Your scepticism is fuel for my brain.

metiz
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Re: Ceramics

Post by metiz » Mon Sep 12, 2011 2:35 pm

More from "amazingdiyprojects". he seems to be having some durability issues. Anyone want to take a guess at what he's using for fuel and nozzles?

http://www.youtube.com/watch?v=zV1snAMK-bY
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PyroJoe
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Re: Ceramics

Post by PyroJoe » Mon Sep 12, 2011 4:27 pm

Looks like he's trying different materials.
Maybe the point is a short duration single run engine. Interesting that is being applied to a rocket setup (note the stability trials). Good stuff

Mark
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Re: Ceramics

Post by Mark » Mon Sep 12, 2011 6:07 pm

I remember posting a topic on a short-lived pulsejet. Perhaps he is using a butane canister for fuel. There is a link from this old post for some steel tape, maybe if you could make a pulsejet last for a short bit with that, a few seconds would be fun in and of itself. Better than a whistling bottle rocket with methanol effect. If you had some thermosteel glue and some thin steel from Enco, maybe you could make a feather-light toy of some sort. I have a roll of .002ths spring steel I have toyed with as a possible short running pulsejet. But my thought was to make a much smaller pulsejet than the jumbo size he is using. If you could jacket the pulsejet in fuel with a double-walled shape, that too would be a good way to keep the temperature down while also preheating the fuel. But I also like the fuel tank forward of the pulsejet like he has done in his video. All nicely combined ready to launch. There're some very old plans from way back where some pulsejet did the same thing, putting the fuel tank ahead of the engine as part of a streamline design.
http://www.right-tape.com/html/prod_hc4260.html

The first two links are dead now.
viewtopic.php?f=7&t=3210&p=56276&hilit= ... ket#p56276
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ace_fedde
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Re: Ceramics

Post by ace_fedde » Mon Sep 12, 2011 7:49 pm

Google-ads came up with some interesting site with info about ceramic and carbon materials and their properties:
http://www.kompozitum.sk/en/index.php?id=4

I must have somewhere more about properties of different ceramics.
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