Abstract: A tool consists of a base material selected from cemented carbide, tool steels, cermet, or hard materials, and a coating of two or more layers. At least one coating layer has the composition Ti—Al—Ta—N and at least one further coating layer has the composition Ti—Al—Ta-Me-N. The component Me is one more elements selected from the group consisting of Si, V, B. The tool, which is preferably a wearing part, is distinguished by a high wear resistance that improves the service life, in particular where high demands are imposed on the tool.

Abstract: A tool or wearing part includes a base body and a single-layer or multilayer coating. At least one layer of the coating is formed of aluminum borate or contains aluminum borate phase fractions. Tools or wearing parts which have been coated in this way have a considerably improved resistance to abrasion, a high toughness and resistance to oxidation and a low coefficient of friction in contact with the wearing body, which leads to a significantly improved service life.

Abstract: A tool consists of a base material selected from cemented carbide, tool steels, cermet, or hard materials, and a coating of two or more layers. At least one coating layer has the composition Ti—Al—Ta—N and at least one further coating layer has the composition Ti—Al—Ta—Me—N. The component Me is one more elements selected from the group consisting of Si, V, B. The tool, which is preferably a wearing part, is distinguished by a high wear resistance that improves the service life, in particular where high demands are imposed on the tool.

Abstract: The wearing part, such as a cutting insert, is made from hard metal or cermet. A hard-material coating is applied on the base material. The coating includes a single-layer or multilayer mixed-oxide coat, predominantly comprising Al2O3, in which defined proportions of titanium oxide and boron oxide are dissolved or homogeneously distributed extremely finely. The wearing part is distinguished by a high wear resistance, which improves the service life, and a fine-grained structure and uniformity of the coat and by a highly economic application of the coat.

Abstract: The wearing part, such as a cutting insert, is made from hard metal or cermet. A hard-material coating is applied on the base material. The coating includes a single-layer or multilayer mixed-oxide coat, predominantly comprising Al2O3, in which defined proportions of titanium oxide and boron oxide are dissolved or homogeneously distributed extremely finely. The wearing part is distinguished by a high wear resistance, which improves the service life, and a fine-grained structure and uniformity of the coat and by a highly economic application of the coat.