Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Sintering which includes a chemical reaction
Reexamination Certificate
2007-12-12
2009-11-10
King, Roy (Department: 1793)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Sintering which includes a chemical reaction
C419S046000, C419S057000, C501S096100, C423S364000, C148S514000
Reexamination Certificate
active
07615185
ABSTRACT:
After an alloy powder including W, Cr, at least one of Ti, Zr, and Hf, and at least one of V, Nb, and Ta is produced, the alloy powder, a powdery carbon material, and a catalyst are heat-treated in the presence of a nitrogen gas. The alloy powder is carbonitrided into a multicomponent ceramics powder, and sintered into a sintered body. Alternatively, a powder of a first substance including at least two of Ti, Al, V, Nb, Zr, Hf, Mo, Ta, Cr, and W is molded into a molded body. Then, the surface of the molded body is surrounded by a second substance including a metal element which is not contained in the powder of the first substance, and the molded body is heat-treated in an atmosphere in which N is present. A porous sintered body thus produced is crushed into a multicomponent ceramics powder.
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Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
King Roy
Mai Ngoclan T
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