A surface-coated cutting tool includes: a tool body formed of a tungsten carbide-based cemented carbide; a lower layer and an upper layer provided on the tool body. The lower layer is formed of a W layer. A metal carbide layer is formed directly on the W layer. A metal carbonitride layer is formed directly on the metal carbide layer. The upper layer has an alternately laminated structure of A layer and B layer. The A layer is formed of an (Al, Ti)N layer represented by (Al.sub.xTi.sub.1-x)N (where x is an atomic ratio and satisfies 0.40x0.70). The B layer is formed of an (Al, Ti, Cr, Si, Y)N layer represented by (Al.sub.1-a-b-c-dTi.sub.aCr.sub.bSi.sub.cY.sub.d)N (where a, b, c, and d are atomic ratios and satisfy 0a0.40, 0.05b0.40, 0c0.20, and 0.01d0.10).

In some implementations of the current subject matter, a brake rotor can include a supporting layer applied to a friction surface of a brake rotor substrate, which can optionally include cast iron, and a coating applied over the supporting layer. The supporting layer can include a preparatory metal, and the coating can impart wear and corrosion resistant properties to the friction surface. Related systems, methods, articles of manufacture, and the like are disclosed.

A sliding member includes a base material, and an amorphous hard carbon film formed on a surface of the base material, in which a sp.sup.2 ratio of the amorphous hard carbon film increases from an inner surface side corresponding to the base material side toward an outer surface side thereof to become a maximum value and further decreases toward the outer surface side.

The invention relates to an antiwear-coated metal component (1), in particular for a ball valve (6), the tribosurface of which component is at least partially provided with a multi-layer antiwear coating (2). The antiwear coating (2) has at least a metal adhesion layer (3a), an adhesion-promoting layer (3b) and at least one first cover layer (3c). The adhesion-promoting layer (3b) comprises a carbide-forming metal or a boride-forming metal. The at least first cover layer (3c) comprises a hydrogen-free tetrahedral carbon. The invention further relates to a method for applying an antiwear coating (2) to a metal substrate (9) in order to produce an antiwear-coated metal component (1) of this type. The invention further relates to a ball valve, comprising an antiwear-coated metal component (1) of this type and an antiwear coating (2).

A cutting tool includes: a substrate; and a coating film formed on the substrate, wherein the coating film includes a first layer formed on the substrate, and a second layer formed on the first layer, the first layer is composed of a boride including zirconium as a component element, and the second layer is composed of a nitride including zirconium as a component element.

The present disclosure relates to a coated substrate having a hard material coating, which comprises a hard carbon layer of the hydrogen-free amorphous carbon layer type, wherein the coating comprises a layer consisting of zirconium between the substrate and the hydrogen-free amorphous carbon layer; wherein between the layer consisting of zirconium and the hydrogen-free amorphous carbon layer, a layer consisting of ZrC.sub.x can be formed in which a zirconium monocarbide is formed; and the layer consisting of ZrC.sub.x and comprising zirconium monocarbide is applied directly to the adhesive layer consisting of zirconium.

A blade has an airfoil having a tip. The blade has a metallic substrate and a coating system atop the substrate at the tip. The coating system has: a first layer of at least 99.0% weight nickel; an abrasive layer having a matrix and an abrasive at least partially embedded in the matrix; and a second layer between the first layer and the matrix. The second layer is tougher or more ductile than at least one of the first layer and the matrix.

A coating system disposed on a surface of a substrate is provided. The coating system includes a bond coating on the surface of the substrate, a protective coating on the bond coating, a thermal barrier coating on the protective coating, and a protective agent disposed within at least some of the voids of the thermal barrier coating. The protective coating is constructed from a ceramic material, and the thermal barrier coating defines a plurality of elongated surface-connected voids. Methods are also generally provided for forming such a coating system.

A sliding member includes a base material and an amorphous hard carbon film formed on a surface of the base material, and the amorphous hard carbon film has a graded structure in which a sp.sup.2 ratio increases from an inner surface side corresponding to the base material side toward an outer surface side. A piston ring includes the sliding member.

A piston ring (10) has a running surface (12) and a flank surface (14) which are coated. The uppermost layer of the running surface (12) is a hydrogen-containing or a hydrogen-free DLC layer, and the uppermost layer of at least one flank surface (14) is a chromium layer. A method of producing a piston ring (10) includes forming a DLC layer as the uppermost layer of the running surface (12), and forming a chromium layer as the uppermost layer of at least one flank surface (14).