Method for manufacturing heating element
AssigneeNational Science Council
InventorS. Wang
Life of this patent
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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.
Claims13
A method for manufacturing a heating element, comprising the steps of:
- a) providing powders of two metals;
- b) mixing said powders to obtain mixed powders;
- c) grinding said mixed powders into finer ones;
- d) compacting said mixed powders to form a green compact;
- e) sintering said green compact in a first atmosphere;
- f) plastically working and process annealing said green compact;
- g) etching a surface of said green compact to cause pores thereon;
- and
- h) sintering said etched green compact in an oxidizing atmosphere.
Dependencies are inferred from the claim text.