Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A multilayer coated cemented carbide comprising a substrate of cemented carbide, an inner layer contacted with the surface of the substrate and an outer layer contacted with the inner layer, the said inner layer being at least one layer consisting of at least one member selected from the group consisting of carbides, nitrides, carbonitrides, carboxynitrides, oxynitrides, boronitrides and borocarbonitrides of Ti, and the said outer layer being a multilayer with a total thickness of 3 µm to 20 µm, preferably of 5 to 20 µm, consisting of a plurality of A1 2 0 3 layers each having a thickness of 0.01 to 2 µm, each consisting of an Al 2 0 3 film in which titanium oxide is dissolved or at most 30 vol % of titanium oxide is coexistent and being respectively divided by interlayers each having a thickness of 0.01 to 2 µm and each consisting of at least one member selected from the group consisting of TiC, TiN, TiCN, TiCNO, TiCO, TiNO, Ti oxides, Ti(B, N), Ti(B, N, C), SiC, A1N and A10N.
Claim 2
Dependent Claim
176 words
A multilayer coated cemented carbide comprising a substrate of cemented carbide, an inner layer contacted with the surface of the substrate and an outer layer contacted with the inner layer, the said inner layer being at least one layer consisting of at least one member selected from the group consisting of carbides, nitrides, carbonitrides, carboxynitrides, oxynitrides, boronitrides and borocarbonitrides of Ti, and the said outer layer being a multilayer with a total thickness of 3 µm to 20 µm, preferably of 5 to 20 µm, consisting of a plurality of A1 2 0 3 layers each having a thickness of 0.01 to 2 µm, each consisting of an Al 2 0 3 film in which titanium oxide is dissolved or at most 30 vol % of titanium oxide is coexistent and being respectively divided by interlayers each having a thickness of 0.01 to 2 µm and each consisting of at least one member selected from the group consisting of TiC, TiN, TiCN, TiCNO, TiCO, TiNO, Ti oxides, Ti(B, N), Ti(B, N, C), SiC, A1N and A10N.
Claim 3
Dependent Claim
50 words
A multilayer coated cemented carbide as claimed in claim 1, wherein the outer layer is further coated with an outermost layer with a thickness of 0.1 to 5 µm, consisting of at least one member selected from the group consisting of nitrides of Ti, Zr and Hf, BN and A1N.
Claim 4
Dependent Claim
29 words
A multilayer coated cemented carbide as claimed in claim 2, wherein the outermost layer is a hard BN film with an Hv hardness of at least 3000 kg/mm .
Claim 5
Dependent Claim
41 words
A multilayer coated cemented carbide as claimed in any one of claims I to 3, wherein the titanium oxide is dissolved in the Al 2 O 3 film in a proportion of 0.01 to 0.1 vol to form a solid solution.
Claim 6
Dependent Claim
57 words
A process for the preparation of a multilayer coated cemented carbide as claimed in any one of claims 1 to 4, wherein the Al 2 O 3 film containing titanium oxide dissolved or coexistent is prepared by feeding simultaneously a titanium halide or organo titanium compound when Al 2 O 3 is formed by chemical vapor deposition.
Claim 7
Dependent Claim
18 words
A cutting tool comprising a multilayer coated cemented carbide as claimed in any one of the preceding claims.