Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1994-11-15
1995-12-26
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 26, 419 28, 419 29, 419 30, 419 33, 419 38, 419 53, 419 57, B22F 312, B22F 316, B22F 700
Patent
active
054785227
ABSTRACT:
The present invention relates to a method for manufacturing a heating element, the method including the steps of: a) providing powders of two metals; b) mixing the powders; c) grinding the mixed powders; d) compacting the mixed powders to form a green compact; e) sintering the green compact in a first atmosphere; f) plastically working and process annealing the green compact; g) etching a surface of the green compact to cause pores thereon; and h) sintering the etched green compact in an oxidizing atmosphere. A Ni-Cr heating element manufactured by the present method has improved high temperature properties and a fusion temperature 300.degree. C. greater than those of conventional Ni-Cr heating elements.
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Bluni Scott T.
National Science Council
Walsh Donald P.
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