Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Sintering which includes a chemical reaction
Patent
1998-03-25
2000-07-18
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Sintering which includes a chemical reaction
419 11, 419 14, 419 17, 419 18, 419 27, 419 48, 419 54, 419 55, B22F 312, B22F 326
Patent
active
060903430
ABSTRACT:
A method for fabricating a triphasic composite such as a WC/Co/diamond composite with a high volume fraction of diamond in a WC/Co matrix. The method involves sintering of a WC/Co powder compact to develop a porous preform, which displays some rigidity and strength, infiltrating the porous preform with a controlled distribution of carbon, and high pressure/high temperature treatment of the carbon-containing WC/Co preform to transform the carbon to diamond. The distribution of diamond in the composite can be functionally graded to provide a WC/Co core and a diamond-enriched surface, wherein all three phases form an interconnected structure in three dimensions. Such a tricontinuous structure combines high strength and toughness with superior wear resistance, making it attractive for applications in machine tools and drill bits.
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Kear Bernard H.
McCandlish Larry E.
Sadangi Rajendra K.
Voronov Oleg
Jenkins Daniel J.
Rutgers University
Schwarz Paul A.
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