Composite material coating and a method for the production thereof
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United States of America Patent
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Dec 9, 2003
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N/A
app pub date -
Mar 14, 2001
filing date -
Sep 24, 1998
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Abstract
The invention relates to a composite material comprised of a coated hard metal or cermet base and to a method for the production thereof. The single layer or multilayer coating on the base contains at least one layer with a thickness ranging from 0.5 .mu.m to 25 .mu.m, at least one Al.sub.2 O.sub.3 phase, and at least one phase comprised of ZrO.sub.2 and/or HfO.sub.2. According to the invention, a third finely dispersive phase comprised of an oxide, oxicarbide, oxinitride or oxicarbonitride of titanium should be included in this Al.sub.2 O.sub.3 /ZrO.sub.2 layer and/or HfO.sub.2 layer. To this end, a CVD process is used at depositing temperatures ranging from 900 .degree. C. to 1000 .degree. C. in the gas phase under pressures ran from 10 to 100000 Pa, whereby the gas phase, in addition to the gases essential for deposition, contains 0.2 to 5 mol % TiCl.sub.4.
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