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

B - Operations, Transporting

23

B

117/233

B23B 27/14 (2006.01) C23C 16/40 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1133524

COATED CEMENTED CARBIDE BODY AND METHOD OF MAKING SUCH A BODY Abstract of the Disclosure There is disclosed a sintered cemented carbide body containing at least one carbide besides binder metal, on which body there is applied at least one thin, wear resistant surface layer essentially consisting of aluminium oxide. The aluminium oxide to at least 85% consists of the kappa modification, the remainder, which mainly constitutes the alpha modification, being formed as surface portions or spots having a size of at the most 10 µm, the relationship between the size and the occurrence of the alpha form aluminium oxide spots being within the area AOBC 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 aluminium halide and a re- ducing 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 to 0.5% of the totally supplied amount of gas.

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