Method and apparatus for spraying molten materials

Coating processes – Spraying – Heated coating material

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Details

427446, 427455, 264 12, 118317, B05D 102, B05C 504

Patent

active

055298095

ABSTRACT:
A metal spray apparatus is provided with a supersonic nozzle. Molten metal is injected into a gas stream flowing through the nozzle under pressure. By varying the pressure of the injected metal, the droplet can be made in various selected sizes with each selected size having a high degree of size uniformity. A unique one piece graphite heater provides easily controlled uniformity of temperature in the nozzle and an attached tundish which holds the pressurized molten metal. A unique U-shaped gas heater provides extremely hot inlet gas temperatures to the nozzle. A particularly useful application of the spray apparatus is coating of threads of a fastener with a shape memory alloy. This permits a fastener to be easily inserted and removed but provides for a secure locking of the fastener in high temperature environments.

REFERENCES:
patent: 4056644 (1977-11-01), Howard et al.
patent: 4066117 (1978-01-01), Clark et al.
patent: 4485759 (1984-12-01), Brandolf
patent: 4512513 (1985-04-01), Rogers
patent: 4911805 (1990-03-01), Ando et al.
patent: 4919853 (1990-04-01), Alvarez
patent: 5206059 (1993-04-01), Marantz

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