Method of heat treating gold or gold alloy parts

Details Method of heat treating gold or gold alloy parts Method of heat treating gold or gold alloy parts

1993-11-23

1994-09-20

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148430, 420507, 420512, C22C 500

Patent

active

053485939

ABSTRACT:
A process for generating in-situ low cost atmospheres suitable for annealing and heat treating ferrous and non-ferrous metals and alloys, brazing metals and ceramics, sealing glass to metals, and sintering metal and ceramic powders in a continuous furnace from non-cryogenically produced nitrogen containing up to 5% residual oxygen is presented. The disclosed process involves mixing nitrogen gas containing residual oxygen with a pre-determined amount of a reducing gas such as hydrogen, a hydrocarbon, or a mixture thereof, feeding the gaseous mixture through a non-conventional device into the hot zone of a continuous heat treating furnace, converting residual oxygen to an acceptable form such as moisture, a mixture of moisture and carbon dioxide, or a mixture of moisture, hydrogen, carbon monoxide and carbon dioxide, and using the resultant gaseous mixture for annealing and heat treating metals and alloys, brazing metals and ceramics, sintering metal and ceramic powders, and sealing glass to metals.

REFERENCES:
patent: 4381955 (1983-05-01), Desai
patent: 4684416 (1987-08-01), Masumoto et al.
patent: 5139739 (1992-08-01), Takayanagi et al.

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