Abstract: The present invention provides multiple grade, composite cemented carbide articles and a method of making such articles. The cemented carbide articles comprise carbides of different grades (or different compositions and/or microstructures) and, therefore, correspondingly different properties at different locations in the same article. The method of the present invention comprises filling different areas or portions of a die with metallurgical powders having different compositions and/or microstructures. The powder is then compressed as a single compact in the die cavity. The compressed compact is subsequently sintered to produce a multigrade cemented carbide article having composition and/or microstructural variations within the volume of the article.
Type:
Grant
Filed:
April 26, 1994
Date of Patent:
August 6, 1996
Assignee:
SinterMet
Inventors:
Prakash K. Mirchandani, Robert E. Thomas, Mark Cippel