Coated cemented carbide body and method of making such a body

Details Coated cemented carbide body and method of making such a body Coated cemented carbide body and method of making such a body

1981-12-16

1984-02-28

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

427253, 427255, 4272552, 428546, 428469, 419 5, 419 6, 419 8, 419 16, B22F 500

Patent

active

RE0315265

ABSTRACT:
An improved sintered cemented carbide body and method for making same is disclosed. The improved sintered cemented carbide body contains at least one metal carbide and a binder metal, on which body there is applied at least one thin, wear resistant surface layer consisting essentially of aluminum oxide and is characterized in that at least 85% of the aluminum oxide consists of the kappa form, the remainder, which mainly constitutes the alpha form, being formed as surface portions or spots having a size of at the most 10 .mu.m, [the size and the occurrence of the surface portions being so adjusted that they lie within the area AOB in FIG. 1 of the attached drawing.]
The body is made by a method wherein a cemented carbide substrate is contacted with a gas containing an aluminum halide and a reducing agent at high temperature, characterized in that a dopant addition of tetravalent titanium, zirconium and/or hafnium ions is added to the gas in an amount of 0.03-0.5% of the totally supplied amount of gas.

REFERENCES:
patent: 3967035 (1976-06-01), Hale
patent: 3999954 (1976-12-01), Kolaska et al.
patent: 4018631 (1977-04-01), Hale
patent: 4052530 (1977-10-01), Fonzi

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