Method for producing spray powders containing chromium nitride
AssigneeH.H. Starck Surface Technology and Ceramic Powders GmbH
InventorsBenno Gries, Bernhard Bruening
Life of this patent
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Abstract
A process for producing a sintered spraying powder comprising chromium nitride includes producing a powder mixture comprising a first powder and a second powder, and sintering the powder mixture to the sintered spraying powder at a nitrogen partial pressure of >1 bar so as to maintain or increase a chemically bound nitrogen in the sintered spraying powder compared to a chemically bound nitrogen in the first powder mixture. The first powder comprises at least one constituent selected from the group consisting of Cr, CrN and Cr2N. The second powder comprises at least one constituent selected from the group consisting of nickel, cobalt, nickel alloys, cobalt alloys and iron alloys.
Claims24
A process for producing a sintered spraying powder comprising chromium nitride, the process comprising:
- producing a powder mixture comprising:
- a first powder comprising at least one constituent selected from the group consisting of Cr, CrN and Cr2N, and
- a second powder comprising at least one constituent selected from the group consisting of nickel, cobalt, nickel alloys, cobalt alloys and iron alloys;
- and
- sintering the powder mixture to the sintered spraying powder at a nitrogen partial pressure of >1 bar so as to maintain or increase a chemically bound nitrogen in the sintered spraying powder compared to a chemically bound nitrogen in the first powder mixture.
A sintered spraying powder comprising chromium nitride obtained by the process comprising:
- producing a powder mixture comprising:
- a first powder comprising at least one constituent selected from the group consisting of Cr, CrN and Cr2N, and
- a second powder comprising at least one constituent selected from the group consisting of nickel, cobalt, nickel alloys, cobalt alloys and iron alloys;
- and
- sintering the powder mixture at a nitrogen partial pressure of >1 bar so as to produce the sintered spraying powder, wherein a chemically bound nitrogen in the sintered spraying powder is increased compared to a chemically bound nitrogen in the powder mixture.
A sintered spraying powder comprising chromium nitride obtained by the process comprising:
- producing a powder mixture comprising:
- a first powder comprising at least one constituent selected from the group consisting of Cr, CrN and Cr2N, and
- a second powder comprising at least one constituent selected from the group consisting of nickel, cobalt, nickel alloys, cobalt alloys and iron alloys;
- and
- sintering the powder mixture at a nitrogen partial pressure of >1 bar and at a temperature of from >1000 to 1500° C. so as to produce the sintered spraying powder, wherein a chemically bound nitrogen in the sintered spraying powder is increased compared to a chemically bound nitrogen in the powder mixture.
A sintered spraying powder comprising chromium nitride obtained by the process comprising:
- producing a powder mixture consisting of:
- a first powder consisting of at least one constituent selected from the group consisting of Cr, CrN and Cr2N, and
- a second powder consisting of at least one constituent selected from the group consisting of nickel, cobalt, nickel alloys and cobalt alloys;
- and
- sintering the powder mixture at a nitrogen partial pressure of >1 bar so as to produce the sintered spraying powder, wherein a chemically bound nitrogen in the sintered spraying powder is increased compared to a chemically bound nitrogen in the powder mixture.
Dependencies are inferred from the claim text.