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US 6,660,371 B1Granted
Composite material coating and a method for the production thereof
AssigneeWidia GmbH
InventorsHartmut Westphal, Volkmar Sottke
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AssigneeWidia GmbH
InventorsHartmut Westphal, Volkmar Sottke
Estimating the term…
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 μm to 25 μm, at least one Al2O3 phase, and at least one phase comprised of ZrO2 and/or HfO2. According to the invention, a third finely dispersive phase comprised of an oxide, oxicarbide, oxinitride or oxicarbonitride of titanium should be included in this Al2O3/ZrO2 layer and/or HfO2 layer. To this end, a CVD process is used at depositing temperatures ranging from 900 ° C. to 1000 ° 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 % TiCl4.
A composite material in the form of a substrate body selected from the group which consists of hard metal and cermet having a coating formed by at least one layer and having a coating thickness of 0.5 μm to 25 μm, the coating including a three-phase layer containing an Al2O3 phase and a second phase selected from the group which consists of ZrO2, HfO2 and mixtures of ZrO2 and HfO2, and a third finely dispersed phase embedded in said three-phase layer consisting of at least one compound selected from the group which consists of an oxide, oxycarbide, oxynitride and oxycarbonitride of titanium, and the third finely dispersed phase consisting of individual crystallites of a size which is smaller than 1/100 of the crystallite size of the Al2O3 phase and the second phase.
Dependencies are inferred from the claim text.