Structural component coated with a hard material and comprising an intermediate layer for improving the adhesive strength of the coating
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United States of America Patent
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May 27, 2008
Issued Date -
N/A
app pub date -
Feb 26, 2002
filing date -
Feb 28, 2001
priority date (Note) -
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Abstract
Structural components that are subject to high stresses, especially caused by wear, can be protected by coating them with a hard material. For metal-cutting tools it is for example known that their wear resistance can be improved by coating them with a hard material. Different thermal expansion coefficients of the substrate material and the coating material and different layer materials in a multilayer coating may produce great stresses. The stress increases as the thickness of the coating increases, thereby increasing the danger of the coating chipping off. In order to solve this problem, the invention proposes an intermediate layer (5) to be interposed between at least two layers (4, 9) of the coating (3), said intermediate layer mainly or exclusively consisting of a material component (6, 8) of an element of the fourth to eighth subgroup of the fourth and fifth period of the periodic system.
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