H2O2 catalyst packs...

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Richard Nienhuis - 16 Jul 2003 17:04 GMT

I noticed the bail type catalyst packs that the Armadillo team are
using. Apparently the coatings just blow right off. Electroplating
might be the answer but does anyone know if vibration in the pack from
highspeed flow will just crack an electroplated coating off? Would
something like catalyst coated inconel bearings work better? You
could constrain them in a rigid manner and there would be practically
no flex, plus its inconnel so expansion would be minimal.

-Rich Nienhuis

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Ian Stirling - 16 Jul 2003 23:17 GMT

> I noticed the bail type catalyst packs that the Armadillo team are
> using. Apparently the coatings just blow right off. Electroplating
> might be the answer but does anyone know if vibration in the pack from
> highspeed flow will just crack an electroplated coating off? Would

There are so many ways of electroplating, and so many surface preparations
that it's not possible to answer it.
Electroplating seems like an art, until you've spent many years learning
the science.

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Cameron Dorrough - 17 Jul 2003 00:28 GMT

> I noticed the bail type catalyst packs that the Armadillo team are
> using. Apparently the coatings just blow right off. Electroplating
[quoted text clipped - 3 lines]
> could constrain them in a rigid manner and there would be practically
> no flex, plus its inconnel so expansion would be minimal.

</lurk>

It's a good idea. I know that coated beads of different materials are used
in ion exchange columns for industry and would think that this might work
here. Maybe several layers of electro-deposited metal beads tightly packed
between the stainless spacers they are using..?

Certainly high-speed flow should not remove the coating from the tiny
beads/balls since there are no sharp surface edges. You would need to have
fairly thin layers to ensure that flow wasn't restricted too much and would
need to trial different sized beads to get the desired reaction rate - but
if it works with water it should work for them too, IMO.

Cameron:-)

<lurk>

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Space Forum / Space Flight / July 2003

H2O2 catalyst packs...