Multi-layer wear resistant coatings
AssigneeMidwest Research Technologies, Inc.
InventorSusan M. Kerber
Life of this patent
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Abstract
An erosion and corrosion resistant coating is formed of a plurality of alternating layers of metallic and ceramic materials. The two materials selected for the layers have complementary wear resistant characteristics, such that one is relatively ductile and the other is relatively brittle. The concentration of the two materials at the interface between adjacent layers is graded to improve the adhesion of the layers and to provide a more unified coating. Preferably radio-frequency sputtering is employed to deposit the coating, since it does not produce excessive heating which could negate any prior heat treatment of the substrate onto which the coating is deposited.
Claims20
A wear resistant coating on a major surface of a substrate for protecting against particle induced erosion and water induced erosion and corrosion, said coating comprising at least four layers with layers of a ceramic material alternating with layers of a metallic material in which the layers of metallic material are as thick or thicker than the layers of ceramic material ;
- and wherein said metallic material comprises one or more elements selected from the group consisting of titanium, zirconium, hafnium and tantalum;
- and
- wherein said ceramic material is a nitride compound of the selected metallic material.
A wear resistant coating on a major surface of a substrate for protecting against particle induced erosion and water induced erosion and corrosion, said coating having a first set of layers of a ceramic material interleaved with a second set of layers of a metallic material to form a coating with at least four layers, in which the layers of metallic material are as thick or thicker than the layers of ceramic material, and wherein the interface between adjacent layers is a graded transition of the concentration of the two materials.
A wear resistant coating on a surface of a substrate for protecting against particle induced erosion and water induced erosion and corrosion, said coating comprising at least four layers with layers of a ceramic material alternating with layers of a metallic material;
- wherein said metallic material comprises one or more elements selected from the group consisting of aluminum, silicon, titanium, chromium, magnesium, iron, zirconium, molybdenum, tin, tungsten and tantalum;
- and
- wherein said ceramic material is an oxide compound of the selected metallic material.
A wear resistant coating on a surface of a substrate for protecting against particle induced erosion and water induced erosion and corrosion, said coating comprising at least four layers with layers of a ceramic material alternating with layers of a metallic material in which the layers of metallic material are as thick or thicker than the layers of ceramic material ;
- wherein said metallic material comprises one or more elements selected from the group consisting of titanium, zirconium, hafnium, iron and tantalum;
- and
- wherein said ceramic material is a carbide compound of the selected metallic material.
Dependencies are inferred from the claim text.