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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.
Inventors:
 [1];  [1];  [1];  [1];  [1]
  1. (Butte, MT)
Issue Date:
OSTI Identifier:
870124
Assignee:
MSE, Inc. (Butte, MT) NETL
Patent Number(s):
US 5459811
Contract Number:
AC22-88ID12735
Research Org:
MSE INC
Country of Publication:
United States
Language:
English
Subject:
metal; spray; apparatus; u-shaped; electric; inlet; gas; heater; one-piece; surrounding; nozzle; electrically; heated; provided; supersonic; molten; injected; stream; flowing; pressure; varying; droplet; various; selected; sizes; size; degree; uniformity; unique; piece; graphite; provides; easily; controlled; temperature; attached; tundish; holds; pressurized; extremely; hot; temperatures; particularly; useful; application; coating; threads; fastener; shape; memory; alloy; permits; inserted; removed; secure; locking; environments; spray apparatus; gas temperature; memory alloy; molten metal; gas stream; particularly useful; shape memory; temperature environments; selected size; inlet gas; useful application; metal spray; stream flowing; size uniformity; easily controlled; temperature environment; supersonic nozzle; electric heater; electric heat; shaped gas; stream flow; gas heater; gas temperatures; easily inserted; injected metal; shaped electric; ray apparatus; size uniform; electrically heated; /392/118/219/239/266/338/427/