A coated cutting tool includes a substrate with a coating including a (Ti,Al)N layer having an overall composition (Ti.sub.xAl.sub.1-x)N, 0.34≤x≤0.65. The (Ti,Al)N layer contains columnar (Ti,Al)N grains with an average grain size of from 10 to 100 nm. The (Ti,Al)N layer also includes lattice planes of a cubic crystal structure. The (Ti,Al)N layer shows a pattern in electron diffraction analysis, wherein there is a diffraction signal existing, which is shown as a peak (P) in an averaged radial intensity distribution profile having its maximum within a scattering vector range of from 3.2 to 4.0 nm.sup.−1, the full width half maximum (FWHM) of the peak (P) being from 0.8 to 2.0 nm.sup.−1.

A cutting tool incudes a substrate and a coating that coats a surface of the substrate, the coating including a multilayer structure layer composed of at least one layer A and at least one layer B alternately deposited from a side closer to the substrate toward a side closer to a surface, the layer A having an average composition of Al.sub.xCr.sub.(1-x)N, the layer B being composed of Ti.sub.yAl.sub.zSi.sub.(1-y-z)N, the layer A being composed of a domain region and a matrix region, the domain region having a composition ratio of Cr larger than that of Cr of the matrix region, wherein x has a range of 0.5≤x≤0.8, y has a range of 0.5≤y<0.71, z has a range of 0.29≤z<0.5, and 1−y−z has a range of 0<1−y−z≤0.1.

The present invention relates to a method of coating one or more metal components of a fuel cell stack, such as a bipolar plate, an electrode, gaskets etc., the method comprising the steps of providing an uncoated metal component; etching said uncoated metal component; optionally depositing an adhesion layer on the etched uncoated metal component; and depositing a carbon coating on either the adhesion layer or on the etched uncoated metal component, with the adhesion layer and the carbon coating respectively being deposited by means of one of a physical vapor deposition process, an arc ion plating process, a sputtering process, and a Hipims process. The invention further relates to a component of a fuel cell stack and to an apparatus for coating one or more components of a fuel cell stack.

A substrate having a multilayer coating system in the form of a surface coating, which has an outer cover layer comprising amorphous carbon, and a coating process for producing a substrate. At least a first Mo.sub.aN.sub.x support layer is provided between the substrate and the cover layer, which support layer has a nitrogen content x, referred to an Mo content a, which is in the range of 25 at %≤x≤55 at %, with x+a=100 at %.

A surface-coated cutting tool comprises a tool substrate comprising a cBN sinter and a hard coating layer including a lower sublayer α and an upper sublayer β on the surface of the cutting edge; wherein α satisfies (Al.sub.1-xTi.sub.x)N (0.40≤x≤0.60); β satisfies (Al.sub.1-y-zTi.sub.yB.sub.z)N (0.40≤y≤0.60 and 0.01≤z≤0.10); in the sublayer β, the variation in the concentration of the B component is repeated; the average Bmaxav of the maxima in the concentration of the B component satisfies z<Bmaxav≤2.0×z, and the average Bminav of the minima in the concentration of the B component satisfies 0≤Bminav<z; and the average thickness tα of α and the average thickness tβ of β satisfy expression: 2.0≤<tβ/tα≤6.0; and the residual stress σ of the overall hard coating layer satisfies −2.0 GPa≤σ≤−0.5 GPa.

A surface coated member having improved stability and a longer service life is provided. The surface coated member includes a base member and a hard coating formed on a surface thereof. The hard coating is constituted of one or more layers. At least one layer among the layers is a layer including hard particles. The hard particles include a multilayer structure having a first unit layer and a second unit layer being layered alternately. The first unit layer includes a first compound. The second unit layer includes a second compound. The first compound and the second compound are respectively made of one or more kind of element selected from the group consisting of a group 4 element, a group 5 element, a group 6 element of a periodic table, and Al, and one or more kind of element selected from the group consisting of B, C, N, and O.

A valve component comprising a substrate with a sliding surface, the sliding surface being designed to be subjected to sliding against another surface during operation of the valve, wherein at least a portion of the sliding surface is coated with a coating comprising an under-layer comprising tungsten and an upper-layer deposited atop the under-layer, said upper-layer comprising diamond-like-carbon, wherein the under-layer comprises carbon and has a layer thickness of at least 11 micrometers, and the upper-layer has a lower coefficient of friction than the under-layer and has a layer thickness of at least 1.5 micrometers.

A coated cutting tool and a process for the production thereof id provided. The coated cutting tool consists of a substrate body of WC-Co based cemented carbide and a coating, the coating including a first (Ti,Al)N multilayer, a first gamma-aluminium oxide layer, and a set of alternating second (Ti,Al)N multilayers and second gamma-aluminium oxide layers.

A coated cutting tool includes a substrate of cemented carbide, cubic boron nitride (cBN) or cermet containing tungsten carbide hard grains and a tungsten carbide (WC) layer deposited immediately on top of the substrate surface. The tungsten carbide (WC) layer is a mixture or combination of hexagonal tungsten mono-carbide α-WC phase and cubic tungsten mono-carbide β-WC phase and unavoidable impurities.

Artificial lift pump components such as couplings are disclosed, all having a body formed from a selected material, the body having an inner diameter and an outer diameter, a first surface treatment introducing carbon, nitrogen, boron into the material to form a first and hard layer, and a second layer defined as an deposited coating to the first layer that is also made of a carbon, nitrogen, or boron and is further characterized as being ceramic like (hard) and having a low-friction.