Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A sintered hard metal product consisting of a cemented metal carbide substrate and a thin wear-resistant surface coating comprising a plurality of coating layers of different compositions applied one on top of the other by chemical vapour deposition, characterized in that said coating layers include: an innermost layer bonded directly to said substrate and consisting of at least one member selected from carbides, nitrides and carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Al and Si; a second layer applied directly on said innermost layer, consisting essentially of aluminium oxide and having a thickness of about 1 to about 3p; and a third layer composed of one or more sub-layers of titanium carbide, titanium nitride and titanium carbonitride, applied on top of said aluminium oxide layer.
Claim 2
Dependent Claim
126 words
A sintered hard metal product consisting of a cemented metal carbide substrate and a thin wear-resistant surface coating comprising a plurality of coating layers of different compositions applied one on top of the other by chemical vapour deposition, characterized in that said coating layers include: an innermost layer bonded directly to said substrate and consisting of at least one member selected from carbides, nitrides and carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Al and Si; a second layer applied directly on said innermost layer, consisting essentially of aluminium oxide and having a thickness of about 1 to about 3p; and a third layer composed of one or more sub-layers of titanium carbide, titanium nitride and titanium carbonitride, applied on top of said aluminium oxide layer.
Claim 3
Dependent Claim
32 words
A product according to claim 1, wherein said coating layers further include an outermost layer consisting essentially of aluminium oxide and having a thickness of from about 0.4 to about 20 microns.
Claim 4
Dependent Claim
24 words
A product according to claim 1 or 2, wherein said innermost layer bonded directly to said substrate consists entirely or partially of titanium nitride.
Claim 5
Dependent Claim
24 words
A product according to claim 1 or 2, wherein said innermost layer bonded directly to said substrate consists entirely or partially of aluminium nitride.
Claim 6
Dependent Claim
38 words
A product according to any one of claims 1 to 4, wherein said third layer is composed of three sub-layers, in the sequence (in a direction from the substrate outwards): titanium nitride - titanium carbonitride - titanium carbide.
Claim 7
Dependent Claim
31 words
A product according to any one of the preceding claims, in which the cemented carbide substrate comprises tungsten carbide, tantalum carbide, niobium carbide and, optionally, titanium carbide, in a cobalt matrix.
Claim 8
Dependent Claim
27 words
A product according to any one of the preceding claims, in the'form of a disposable cutting insert for use in the machining of metals and other materials.
Claim 9
Dependent Claim
24 words
A product according to any one of the preceding claims , in which the total thickness of the coating is less than 20 microns.
Claim 10
Dependent Claim
14 words
9 . A coated sintered hard metal product substantially as herein described and exemplified.
Claim 11
Dependent Claim
14 words
9 . A coated sintered hard metal product substantially as herein described and exemplified.