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US 5,632,941 AGranted
Group IVB boride based articles, articles, cutting tools, methods of making, and method of machining group IVB based materials
AssigneeKennametal Inc.
InventorsPankaj K. Mehrotra, Deepak P. Ahuja, Holly S. Brooks
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Abstract
A densified titanium diboride based ceramic composition is provided having W and Co therein and a fine grain size. The composition has particular usefulness as a cutting tool for the machining of titanium based alloys at high speeds.
Claims3
A method of fabricating a titanium boride based article of manufacture comprising the steps of:
- adding 3.0-12 w/o of the sum of WC+Co and an effective amount of a grain growth inhibitor to TiB.sub.2 powder and mixing the TiB.sub.2, WC, Co, and said grain growth inhibitor together to form a mixture;
- pressing the mixture to form a compact;
- then sintering the compact at a pressure of up to 30,000 psi to produce a substantially dense article of manufacture having an average grain size of 8 .mu.m or less.
A process for manufacturing a TiB.sub.2 based ceramic comprising the steps of:
- milling a powder containing at least 60 w/o TiB.sub.2 powder with a WC-Co cemented carbide milling media for a time sufficient to produce a powder blend having about 2.5 to 12 w/o total of WC+Co picked up from attrition of the WC-Co cemented carbide milling media during said milling of said powder;
- and
- densifying the powder blend.
Dependencies are inferred from the claim text.