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Title: Self-locking threaded fasteners

A threaded fastener with a shape memory alloy (SMA) coatings on its threads is disclosed. The fastener has special usefulness in high temperature applications where high reliability is important. The SMA coated fastener is threaded into or onto a mating threaded part at room temperature to produce a fastened object. The SMA coating is distorted during the assembly. At elevated temperatures the coating tries to recover its original shape and thereby exerts locking forces on the threads. When the fastened object is returned to room temperature the locking forces dissipate. Consequently the threaded fasteners can be readily disassembled at room temperature but remains securely fastened at high temperatures. A spray technique is disclosed as a particularly useful method of coating of threads of a fastener with a shape memory alloy.
 [1];  [1];  [1];  [1]
  1. (Butte, MT)
Issue Date:
OSTI Identifier:
MSE, Inc. (Butte, MT) NETL
Patent Number(s):
US 5484244
Contract Number:
Research Org:
Country of Publication:
United States
self-locking; threaded; fasteners; fastener; shape; memory; alloy; coatings; threads; disclosed; special; usefulness; temperature; applications; reliability; coated; mating; produce; fastened; coating; distorted; assembly; elevated; temperatures; tries; recover; original; exerts; locking; forces; returned; dissipate; consequently; readily; disassembled; remains; securely; spray; technique; particularly; useful; method; original shape; useful method; temperature applications; memory alloy; elevated temperatures; elevated temperature; particularly useful; shape memory; spray technique; temperature application; threaded fastener; /411/29/