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Porous metal composite body
| Details |
Inventors: Thomas, Thomas Ronald; Badyal, Jas Pal Singh;
Assignee: British Technology Group Limited (London, GB2)
Primary Examiner: Langel; Wayne
Assistant Examiner: Boozer; Tanaga Anne
Attorney, Agent or Firm: Nixon & Vanderhye
Microporous polytetrafluoroethylene is metallised with 1 micron platinum, which is plasma-oxygenated then plasma-hydrogenated, whereby to increase the surface area of the platinum. The resulting composite body has applications as a catalyst or electrode. |
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DETAILED DESCRIPTION We claim: 1.
A method of making a porous Gp VIII metal composite body, comprising: metallising a porous substrate with a Group VIII metal, oxidising the metallized porous substrate in the gas phase by oxidative plasma, and then reducing the metallized porous substrate in the gas phase by reducing plasma.
2.
A method according to claim 1, wherein the substrate is ceramic or polymeric.
3.
A method according to claim 2, wherein the substrate is a fluoropolymer.
4.
A method according to claim 1, wherein the body is metallised in the gas phase.
5.
A method according to claim 1, wherein the Gp VIII metal is platinum, palladium or nickel.
6.
A method according to claim 1, wherein the ratio metal:substrate is less than 1:1.
7.
A method according to claim 6, wherein the ratio metal:substrate is less than 1:100.
8.
A method according to claim 1, in which the metallized porous substrate is oxidised by oxygen plasma.
9.
A method according to claim 1, wherein the reduction is performed by hydrogen plasma.
10.
A method according to claim 1 in which the substrate does not exceed 325K during the plasma treatments.
Description:
This application claims benefit of international application PCT/GB95/00620 filed Mar.
21, 1995.
This invention relates to the production of a composite body comprising porous metal attached to a substrate.
There are applications for such composite bodies in the electrochemical field such as for gas sensors and fuel cells, as well as in the general field of catalysis of chemical reactions and catalytically acting surfaces generally, where high surface areas are required.
The substrate is therefore preferably of high surface area, for example it is porous (preferably microporous), and is advantageously of an inert material such as a polymeric material such as a fluoropolymer.
Microporous fluoropolymers are well known as chemically, thermally and biologically stable materials used in various phase separation situations, and are advantageously made, for the purposes of the invention, of microporous PTFE (polytetrafluoroethylene) membrane products as disclosed in European Patent 247771, which are useful in a range of applications, including metallised examples produced by for example sputter coating, electrolysis or spin coating
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