Protection layer
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United States of America Patent
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-
Feb 28, 1989
Grant Date -
N/A
app pub date -
Jan 15, 1987
filing date -
Apr 17, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The protection layer (3,4,5) applied to a support (1) by a vacuum plasma spraying process comprises an adherence layer (3), an intermediate layer (4) and a coating layer (5). In order to enable a universal application of the protection, particularly in the construction of turbines, foundry and nuclear technique, the adherence layer (3) is made of a selected material having a composition and a thermal expansion coefficient close to those of the material of the object to be coated (1). The intermediate layer (4) is comprised of a mixture of the material of the adherence layer (3) and of that of the coating layer (5) and the coating layer is comprised of a thick layer of sprayed material selected in the group of borides, carbides, nitrides and oxides of preferably TiB.sub.2 or Al.sub.2 O.sub.3.
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