Specialized metallurgical processes – compositions for use therei – Processes – Producing or purifying free metal powder or producing or...
Patent
1993-03-17
1994-09-27
Wyszomierski, George
Specialized metallurgical processes, compositions for use therei
Processes
Producing or purifying free metal powder or producing or...
75352, 75356, B22F 904
Patent
active
053504372
ABSTRACT:
This invention provides a minute alloy powder with hard particles uniformly dispersed therein. The alloy powder may be used as a grinder material for finishing a specular surface or surfaces of other precision instruments or as a material for cladding and strengthening a surface of a parent material by welding the alloy powder. This alloy powder is manufactured by first blending metal or alloy particle powder having a particle diameter between 0.1.mu. and 300.mu., hard particle powder having a particle diameter between 0.1.mu. and 50.mu., and an organic binder. The resulting material mixture is granulated into granulated powder having a particle diameter between 300.mu. and 80,000.mu., and the powder is welded or dissolved with electric arc or plasma arc. The resulting welded bead or ingot is machined with a shaper into shavings, and the shavings are ground with a stamping mill into powder. The powder is classified such that the alloy powder having a particle diameter between 10.mu. and 10,000.mu. is sorted out. Since prior to the grinding step the powder, having a very minute particle diameter, is granulated, the time period required for the grinding step can be reduced to one third of that of the prior art.
REFERENCES:
patent: 3740210 (1973-06-01), Bomford et al.
patent: 4687511 (1987-08-01), Paliwal et al.
Endo Hiroshi
Watanabe Yasushi
Daido Tokushuko Kabushiki Kaisha
Wyszomierski George
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