C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 31/34 (2006.01) C22C 1/05 (2006.01) C22C 29/08 (2006.01)
Patent
CA 2114639
A new carbothermic reaction process is described for the thermochemical processing of nanophase WC-Co powders. The process permits shorter reaction times, reduced temperatures, and finer microstructures compared to conventional processing methods. The process builds on our experience with spray conversion processing [1], but involves 1) chemical vapor infiltration reaction of the carbon infiltrant and particle substrate to form WC-Co; and 2) removal of any excess (unreacted) carbon by con- trolled gasification. A feature of the carbothermic reaction process is its adaptability to conventional WC-Co processing technolo- gy, as well as to spray conversion processing technology. The resulting powder particles consist of a network of fine grains, (less than 100 nm) of WC and Co with interconnected fine porosity. Powder particles suitable for subsequent handling and consolida- tion are readily produced with diameters greater than 10 microns.
Kear Bernard H.
Kim Byoung-Kee
Mccandlish Larry E.
Macrae & Co.
Rutgers The State University Of New Jersey
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