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Title: Metal spray apparatus with a U-shaped electric inlet gas heater and a one-piece electric heater surrounding a nozzle

An electrically heated 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. 12 figs.
Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
119051
Assignee:
MSE, Inc., Butte, MT (United States) PTO; SCA: 360101; PA: EDB-95:149055; SN: 95001477072
Patent Number(s):
US 5,459,811/A/
Application Number:
PAN: 8-192,697
Contract Number:
AC22-88ID12735
Resource Relation:
Other Information: PBD: 17 Oct 1995
Research Org:
MSE Inc
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; SPRAY COATING; EQUIPMENT; DESIGN; FASTENERS; SPRAYED COATINGS; LIQUID METALS; TEMPERATURE CONTROL; PRESSURE DEPENDENCE; USES

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