COATING MATERIALS FOR A CUTTING TOOL / AN ABRASION RESISTANCE TOOL
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United States of America Patent
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Issued Date -
Jun 28, 2007
app pub date -
Nov 3, 2006
filing date -
Dec 23, 2005
priority date (Note) -
Abandoned
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Abstract
Disclosed herein is an .alpha.-Al.sub.2O.sub.3 coating layer, which is applied on the surface of a cutting tool substrate made of cemented carbide, cermet or ceramic material. The .alpha.-Al.sub.2O.sub.3 layer is deposited on a TiMewCxNyOz (Me=Zr, Hf, w+x+y+z=1, w, x, y, z.gtoreq.0) layer to a thickness of 2-1 5 .mu.m through high-temperature chemical vapor deposition, such that the texture coefficient, TC(110), of the crystal plane (110) among the crystal planes (012), (104), (110), (113), (024) and (116) thereof is larger than 1.5, while the texture coefficient of the crystal planes (012), (104), (113), (024) and (116) is smaller than 1.0, said .alpha.-Al.sub.2O.sub.3 layer having thermal cracks. Thus, the .alpha.-Al.sub.2O.sub.3 layer has improved abrasion resistance and adhesion.
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