Thermoconductive super-hydrophobic coating of Aluminium
07-27-2010, 03:28 PM,
#1
Thermoconductive super-hydrophobic coating of Aluminium
Hy,
I am in a team working in the developement of an engine whose core will need a surface treatment on Aluminium (other metals like cupper or a similar specific heat capacity would be possible) that will:
a) maintain the heat transfer capacity of Al and
b)result in a superhydrophobic surface (the liquid used has a contact angle of 180º, which should theoretically make things easy, but in practice it behaves like water).
What I intend to do is to create an epoxi based mixture of metall dust (it seems that rugh surfaces on a microscopic level decline the adherence of liquids) and caranuba wax (treating the named surfaces with caranuba-based wax has given the best results obtaind to date), but I reccon ther is better to be done.
Thanks for help Smile
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07-29-2010, 09:11 PM,
#2
RE: Thermoconductive super-hydrophobic coating of Aluminium
There are copper-tungsten alloys available which will give excellent heat transfer while maintaining a reasonable amount of wear resistance. You can also get copper coated ceramics. I wonder how well epoxy will hold up inside an engine - not very well I should think.

A better solution might be a thin coating of metal (applied with a thermal spray process, not epoxy) on the aluminum. A thin coating will not impede heat transfer very much, but it can provide the other properties you need.
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07-29-2010, 09:23 PM,
#3
RE: Thermoconductive super-hydrophobic coating of Aluminium
(07-29-2010, 09:11 PM)djewell Wrote: There are copper-tungsten alloys available which will give excellent heat transfer while maintaining a reasonable amount of wear resistance. You can also get copper coated ceramics. I wonder how well epoxy will hold up inside an engine - not very well I should think.

A better solution might be a thin coating of metal (applied with a thermal spray process, not epoxy) on the aluminum. A thin coating will not impede heat transfer very much, but it can provide the other properties you need.

Thank´s a lot for your advice, any other ideas?
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07-31-2010, 05:07 PM,
#4
RE: Thermoconductive super-hydrophobic coating of Aluminium
Hi Cyphyus

Sign0016 to the Surface Engineering Forum.

What is the function of the part?

Have you considered PTFE coating?
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07-31-2010, 11:04 PM,
#5
RE: Thermoconductive super-hydrophobic coating of Aluminium
(07-31-2010, 05:07 PM)Gordon Wrote: Hi Cyphyus

Sign0016 to the Surface Engineering Forum.

What is the function of the part?

Have you considered PTFE coating?

Hy, we have done some tests with PTFE but without improvement. I cannot yet describe the function of it, but it won´t suffer any mechanic stress except that of the fluid at high pressure. sorry & thanks
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08-03-2010, 07:22 AM,
#6
RE: Thermoconductive super-hydrophobic coating of Aluminium
diamond is highly thermally conductive and hydrophobic, but costly.

most polymers are not quite thermoconductive (depending on how high you want).
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08-03-2010, 01:40 PM,
#7
RE: Thermoconductive super-hydrophobic coating of Aluminium
(08-03-2010, 07:22 AM)pulaunias Wrote: diamond is highly thermally conductive and hydrophobic, but costly.

most polymers are not quite thermoconductive (depending on how high you want).

Thanks! I think that is an very good idea, I will try to get some diamond dust to mix it with the polymer, theoretically it should maintain the conductivity if the particles are in touch with the metal. I hadn´t thought of that possibility, as soon as I get the parts to be treated & the diamonds, I´ll let you know the results, I hope less than a month time. Thanks again!
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08-03-2010, 04:28 PM,
#8
RE: Thermoconductive super-hydrophobic coating of Aluminium
come back and get us posted.

I remember my ceramics Prof told me diamond has the highest thermal conductivity in all (known) materials.

Initially it came to me that sputter or somehow coat the substrate with diamond-like diamond or sth like that. I am not very sure if diamond/polymer composite will give better results than metal/polymer or not, but worth trying.
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08-03-2010, 06:43 PM,
#9
RE: Thermoconductive super-hydrophobic coating of Aluminium
(08-03-2010, 04:28 PM)pulaunias Wrote: come back and get us posted.

I remember my ceramics Prof told me diamond has the highest thermal conductivity in all (known) materials.

Initially it came to me that sputter or somehow coat the substrate with diamond-like diamond or sth like that. I am not very sure if diamond/polymer composite will give better results than metal/polymer or not, but worth trying.

sure, I am not quite certain about the hydrofobic properties, but they will certainly depend on shape, size and the structure formed by the compound... thanx again Smile
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