Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Mandy Hoehn

Ingolf Endler

Articles containing metal, hard metal, cermet or ceramic and coated with a hard material, and a method for producing same. The hard material layers can be used as anti-wear layers for cutting tools, as protective layers for turbine blades, or as diffusion barriers in microelectronics. The hard material layers exhibit a high hardness, high oxidation resistance, and excellent wear resistance. The articles are coated with a single- or multi-layer layer system by a thermal CVD method without plasma excitation, where the single- or multi-layer layer system includes at least one nanocomposite layer with a first nanocrystalline phase of cubic titanium oxycarbonitride and a second, amorphous phase of silicon oxycarbonitride or silicon oxycarbide.

Articles consisting of metal, hard metal, cermet or ceramic and coated with a hard material, and method for producing such articles

The invention relates to coated bodies made of metal, hard metal, cermet or ceramic material, coated with a single- or multi-layer coating system containing at least one hard material composite coating, and to a method for coating such bodies. The aim of the invention is to develop a coating system for such bodies, which is single- or multi-layered and comprises at least one hard material composite coating, which contains cubic TiAlCN and hexagonal AlN as the main phases and is characterized by a composite structure having a smooth, homogeneous surface, high oxidation resistance and high hardness. The aim includes the development of a method for cost-effectively producing such coatings. The hard material composite coating according to the invention contains cubic TiAlCN and hexagonal AlN as main phases, wherein the cubic TiAlCN is microcrystalline fcc-TiAlCNwhere x&#x3e;0.75, y=0 to 0.25 and z=0.75 to 1 having a crystallite size of &#x2267;=0.1 &#x3bc;m, and wherein the composite coating in the grain boundary region additionally contains amorphous carbon having a percent by weight of 0.01% to 20%. The coating is carried out according to the invention in a LPCVD process at temperatures between 700&#xb0; C. and 900&#xb0; C. and at pressures between 10Pa and 10Pa without additional plasma excitation. The hard material composite coating according to the invention is characterized by a composite structure having a smooth, homogeneous surface, high oxidation resistance and high hardness and can be used in particular as a wear protection coating on SiNand WC/Co indexable inserts and steel components.

Coated bodies made of metal, hard metal, cermet, or ceramic, and method(s) for coating of such bodies

The invention relates to bodies coated with a hard material, comprising a multi-layer coating system containing at least one TiAlN hard material coating and to a multi-stage CVD method for producing the bodies. The aim of the invention is to achieve excellent adhesion of the TiAlN hard material coating in bodies coated with a hard material comprising a multi-layer coating system containing at least one TiAlN hard material coating and a high degree of wear resistance. According to the invention, the bodies coated with a hard material comprising a multi-layer coating system containing at least one TiAlN hard material coating are characterized by the following features: the coating system consists of a) a bonding coating applied to the body, consisting of TiN, Ti(C,N) or TiC; b) a phase gradient coating that is applied to the bonding coating; and c) the single or multi-phase TiAlN hard material coating or coatings applied to the phase gradient coating. The phase gradient coating consists of a TiN/h-AlN phase mixture on the side facing the bonding coating and has an increasing phase fraction of fcc-TiAIN with an increasing coating thickness, (the fraction being &#x3e;50%), towards the TiAlN hard material coating(s) and a corresponding simultaneous decrease in the phase fractions of TiN and h-AlN. The coating according to the invention can be used in particular for tools and components consisting of steel, hard metals, cermets and ceramics, such as for example drills, milling cutters and indexable cutting inserts.

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Dresden, Germany

Mandy Hoehn