B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/128, 204/96.
B32B 15/02 (2006.01) B32B 15/20 (2006.01) B32B 18/00 (2006.01) H01B 3/10 (2006.01) H01B 7/28 (2006.01) H01B 7/29 (2006.01) H01B 17/62 (2006.01) A61B 17/22 (2006.01) A61M 29/02 (2006.01)
Patent
CA 1264616
ABSTRACT An article of manufacture which has at least a part that is formed from metallic copper has, on a surface of the copper part, an adherent, sub- stantially contaminant-free refractory layer and an intermediate layer formed from a metal which acts as a barrier to diffusion of oxygen or copper or both. The intermediate layer has a thickness of at least 1.1 micrometres. It has been found that, in articles according to the invention, the metal forming the intermediate layer eliminates or substantially reduces the mechanisms by which failure occurs, thus extending the high temperature lifetime of the article. Thus, for example in the case of circuit or signal integrity cables, the time required to cause circuit failure in a fire would be substantially increased. The metal forming the intermediate layer for this purpose may be one which acts as a barrier to diffusion of either the underlying substrate to the outer surface of the article or to the diffusion of oxygen into the sub- strate. It may restrict diffusion in its elemental form or it may hinder diffusion processes, by formation of oxide scales when exposed to air, as is the case with for example Aluminium. Such scales are most effective if they are stable on formation and exhibit low growth rates.
486456
Duckworth Stephen John
O'brien James Martin
Penneck Richard John
Smith Nicholas John Gregg
Fetherstonhaugh & Co.
Raychem Limited
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