Coated cemented carbide bodies
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United States of America
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Apr 15, 1986
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N/A
app pub date -
Jul 29, 1983
filing date -
Nov 6, 1980
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Abstract
A process for increasing the resistance to wear of the surface of hard metal parts subject to wear, such as a cutting blade of metal cutting tools, and the product which results from the process, which includes coating the surface of the hard metal, for example, cemented carbide articles with a first layer comprised of one or more layers of a metallic carbide or nitride in a total thickness ranging from 0.01 to 10 .mu.m, a second layer comprised of one or more layers of a refractory oxide, such as an oxide of aluminum, zirconium, silicon, calcium, magnesium, titanium, and hafnium, and stabilized zirconium oxide in a total thickness ranging from 0.5 to 10 .mu.m, and depositing over the refractory oxide coating a third layer comprised of one or more layers of a nitride, carbonitride, oxynitride, oxycarbide or oxycarbonitride .[.and boride.]. of such metals as titanium, zirconium, hafnium, aluminum and silicon in a total thickness ranging from 1 to 10 .mu.m. The process may include transitional layers to optimize the adherence of the various layers.
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