expect a long learning curve here - tonemaniac - Tweakers' Asylum

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expect a long learning curve here

In Reply to: "bong" sound posted by pburant on June 25, 2004 at 09:47:45:

Ihen the graphite plate is supported on three points by the gum rubber erasers and tapped in the center it has a soft tone. The big question in my mind is how this tone is a result of the porosity. There is a large variation in porosity depending on the grade. Porous graphite could be around 15% void and pressure molded could be as low as 1%. The stuff I have is about 4% void I think. The strange thing is when it is constained somehow, like sitting in on one edge, how much more damped it seems. On the subject of epoxy, I've never liked the sound of raw epoxies. They sound hard plastic. I got around this by mixing my epoxy resins with superfine (15 micron) industrial diamond powder. The result is absolutely awesome. Lightning fast, no blurring, in some applications it can redefine the concept of "smeared", and tough as all get out. Diamond has a Young's modulus four times greater than Beryllium, so there is just no stored energy hangover. I can't remember the exact ratios I used on my last project, I believe it was 50 carats of 15 micron (1000 mesh) for 4 of the double syringe things of 2 ton epoxy. For crossovers and live circuits you have to use low emission electronic grade epoxy.
All in all, carbon is wild stuff. I think we're only scratching the surface. I'm toying with the idea of combining ultrfine(1 micron) diamond with C37 for a paint on coating for chips. Diamond has excellent thermal conduction too.

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Follow Ups Full Thread

Topic - Graphite Adventures - tonemaniac 07:06:20 06/25/04 (13)

Carbon dust is a carcinogenic so be careful. - Tony D. 22:36:13 06/27/04 (1)

try to have the machining done by the supplier - tonemaniac 05:44:13 06/28/04 (0)

"bong" sound - pburant 09:47:45 06/25/04 (9)

Re: "bong" sound - _canuck 06:46:52 06/26/04 (3)

I've always speculated - pburant 19:34:54 06/26/04 (0)

they use woven carbon fiber cloth, a different animal - tonemaniac 09:51:12 06/26/04 (1)

Re: they use woven carbon fiber cloth, a different animal - _canuck 11:36:57 06/26/04 (1)

Oh. I thought you meant... - bdiament 14:46:01 06/25/04 (1)

College..... - pburant 19:27:12 06/26/04 (0)

expect a long learning curve here - tonemaniac 10:38:02 06/25/04 (2)

Epoxy - pburant 10:55:24 06/25/04 (1)

the beauty of diamond is that... - tonemaniac 11:13:09 06/25/04 (1)

Follow Ups

expect a long learning curve here - tonemaniac 10:38:02 06/25/04 (2)

Epoxy - pburant 10:55:24 06/25/04 (1)

the beauty of diamond is that... - tonemaniac 11:13:09 06/25/04 (1)

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