Walter Ag

Thorsten Manns

Dirk Stiens

Sakari Ruppi

A coated cutting tool has a substrate of cemented carbide, cermet, ceramics, steel or cubic boron nitride and a multi-layered wear resistant coating deposited thereon has a total thickness from 4 to 25 &#x3bc;m. The multi-layered wear resistant coating includes a TiAlCN layer (a) represented by the formula Ti1-xAlxCyNz with 0.2&#x2264;x&#x2264;0.97, 0&#x2264;y&#x2264;0.25 and 0.7&#x2264;z&#x2264;1.15 deposited by CVD, and a &#x3ba;-AlOlayer (b) of kappa aluminium oxide deposited by CVD immediately on top of the TiAlCN layer (a). The Ti1-AlxCyNz layer (a) has an overall fiber texture with the {111} plane growing parallel to the substrate surface and a {111} pole figure, measured over an angle range of 0&#xb0;&#x2264;&#x3b1;&#x2264;80&#xb0; and the &#x3ba;-Al2O3 layer (b) has an overall fiber texture with the {002} plane growing parallel to the substrate surface and a {002} pole figure, over an angle range of 0&#xb0;&#x2264;&#x3b1;&#x2264;80&#xb0;.

Cutting tool with textured alumina layer

A coated cutting tool includes a substrate and a coating. The coating has an inner layer of 4-14 &#x3bc;m thick TiAlN, an intermediate layer of 0.05-1 &#x3bc;m TiCN and at least one outer layer of 1-9 &#x3bc;m &#x3b1;-AlO. The &#x3b1;-AlOlayer exhibits an X-ray diffraction pattern, as measured using CuK&#x3b1; radiation and theta-2theta scan. A texture coefficient TC(hkl) is defined according to Harris formula, wherein the (hkl) reflections used are (0 2 4), (1 1 6), (3 0 0) and (0 0 12), I(hkl)=measured intensity (peak intensity) of the (hkl) reflection, I0(hkl)=standard intensity according to ICDD's PDF-card No. 00-042-1468, n=number of reflections used in the calculation, and 3&#x3c;TC(0 0 12)&#x3c;4.

Coated cutting tool

A coated cutting tool includes a substrate of cemented carbide, cermet, ceramics, steel or cubic boron nitride and a multi-layered wear resistant coating. The multi-layered wear resistant coating has a total thickness from 5 to 25 &#x3bc;m and includes refractory coating layers deposited by chemical vapour deposition (CVD) or moderate temperature chemical vapour deposition (MT-CVD). The multi-layered wear resistant coating has at least one pair of layers (a) and (b), with layer (b) being deposited immediately on top of layer (a). Layer (a) is a layer of aluminium nitride having hexagonal crystal structure (h-AlN) and a thickness from 10 nm to 750 nm. Layer (b) is a layer of titanium aluminium nitride or titanium aluminium carbonitride represented by the general formula TiAlCNwith 0.4&#x2264;x&#x2264;0.95, 0&#x2264;y&#x2264;0.10 and 0.85&#x2264;z&#x2264;1.15, having a thickness from 0.5 &#x3bc;m to 15 &#x3bc;m, and at least 90% of the TiAlCNof layer (b) has a face-centered cubic (fcc) crystal structure.

Coated cutting tool with h-AlN and Ti1-xAlxCyNz layers

A tool having includes a base body of cemented carbide, cermet, ceramics, steel or high-speed steel and a single-layer or multi-layer wear protection coating deposited thereon by CVD process and having a thickness within the range of from 2 &#x3bc;m to 25 &#x3bc;m. The wear protection coating has at least a Ti1-xAlxCyNz layer with 0.40&#x2264;x&#x2264;0.95, 0&#x2264;y&#x2264;0.10 and 0.85&#x2264;z&#x2264;1.15 having a thickness in the range of from 1 &#x3bc;m to 16 &#x3bc;m and having &#x3e;85 vol-% face-centered cubic (fcc) crystal structure. The Ti1-xAlxCyNz layer includes precipitations of Ti1-oAloCpNq at the grain boundaries of the Ti1-xAlxCyNz crystallites have a higher Al content than inside the crystallites, wherein 0.95&#x2264;o&#x2264;1.00, 0&#x2264;p&#x2264;0.10, 0.85&#x2264;q&#x2264;1.15 and (0&#x2212;x)&#x2265;0.05.

Tool with TiAIN coating

A coated cutting tool includes a substrate of cemented carbide, cermet, ceramics, steel or cubic boron nitride, a multi-layered wear resistant coating and at least two refractory coating layers deposited. The at least two refractory coating layers include a first coating layer and a second coating layer deposited on top of each other. The first coating layer is titanium aluminum nitride or carbonitride TiAlCN, with 0.2&#x2264;u&#x2264;1.0, 0&#x2264;v&#x2264;0.25 and 0.7&#x2264;w&#x2264;1.15 deposited by CVD. The second coating layer is titanium carbonitride TiCN, with 0.85&#x2264;x&#x2264;1.1 and 0.4&#x2264;y&#x2264;0.85, and is deposited on top of the first coating layer by MT-CVD. The second TiCNcoating layer has a columnar grain morphology and the overall fiber texture of the TiCNcoating layer is characterized by a texture coefficient TC (1 1 1)&#x3e;2.

Coated cutting tool insert with MT-CVD TiCN on TiAI(C,N)

A tool has a main part of hard metal, cermet, ceramic, steel, high-speed steel, and a single or multilayer wear protection coating applied onto the main part by CVD and which has a thickness from 3 &#x3bc;m to 25 &#x3bc;m. The wear protection coating has at least one TiAlCNlayer with stoichiometric coefficients 0.70&#x2264;x&#x3c;1.0&#x2264;y&#x3c;0.25 and 0.75&#x2264;z&#x3c;1.15 and a thickness from 1.5 &#x3bc;m to 17 &#x3bc;m. The TAlCNlayer has a lamellar structure with lamellae with thickness of no more than 150 nm, preferably no more than 100 nm, particularly preferably no more than 50 nm. Lamellae are made of periodically alternating regions of the TiAlCNlayer with alternatingly different stoichiometric proportions of Ti and Al, having the same crystal structure (crystallographic phase), and the TiAlCNlayer has at least 90% vol. % of face centered cubic (fcc) crystal structure.

TiAlCN layers with lamellar structure

A tool having a base body of carbide, cermet, ceramic, steel or high speed steel and a single-layer or multi-layer wear-protection coating applied thereto in a CVD process, wherein the wear-protection coating has at least one TiAlCNlayer having stoichiometry coefficients 0.70&#x2264;x&#x3c;1.0&#x2264;y&#x3c;0.25 and 0.75&#x2264;z&#x3c;1.15 wherein the TiAlCNlayer is of a thickness of 1 &#x3bc;m to 25 &#x3bc;m and has a crystallographic preferential orientation, which is characterized by a ratio of the intensities of the X-ray diffraction peaks of the crystallographic {111} plane and the {200} plane, wherein I{111}/I{200}&#x3e;1+h (ln h), wherein h is the thickness of the TiAlCNlayer in micrometer.

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Tubingen, Germany

Thorsten Manns