Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1990-05-23
1991-11-05
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
75252, 75255, 419 23, 419 26, 419 29, 419 33, 419 46, 419 57, G22F 100
Patent
active
050630210
ABSTRACT:
A method is disclosed for preparing an intimate mixture of powders of nickel-boron-silicon alloy and molybdenum metal powder suitable for thermal spray coatings which comprises milling a starting mixture of the alloy and molybdenum powder to produce a milled mixture wherein the average particle size is less than about 10 micrometers in diameter, forming an aqueous slurry of the resulting milled mixture and a binder which can be an ammoniacal molybdate compound or polyvinyl alcohol, and agglomerating the milled mixture and binder. The intimate mixture and binder are preferably sintered in a reducing atmosphere at a temperature of about 800.degree. C. to about 950.degree. C. for a sufficient time to form a sintered partially alloyed mixture wherein the bulk density is greater than about 1.2 g/cc. The resulting sintered mixture is preferably entrained in an inert carrier gas, passed into a plasma flame wherein the plasma gas can be argon or a mixture of argon and hydrogen, and maintained in the plasma flame for a sufficient time to melt essentially all of the powder particles of the sintered mixture to form spherical particles of the melted portion, and to further alloy the sintered mixture, and cooled.
REFERENCES:
patent: 3945863 (1976-03-01), Precht
patent: 4123266 (1978-10-01), Foley et al.
patent: 4129444 (1978-12-01), Dreyer et al.
Anand Vidhu
Davis Clarke D.
Houck David L.
Sampath Sanjay
GTE Products Corporation
Lechert Jr. Stephen J.
Quatrini L. Rita
Walter Robert E.
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