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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. 13 figs.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
187085
Assignee:
MSE, Inc., Butte, MT (United States) PTO; SCA: 420200; 360101; PA: EDB-96:038538; SN: 96001532322
Patent Number(s):
US 5,484,244/A/
Application Number:
PAN: 8-192,696
Contract Number:
AC22-88ID12735
Resource Relation:
Other Information: PBD: 16 Jan 1996
Research Org:
MSE Inc
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; FASTENERS; DESIGN; COATINGS; ALLOYS; SPRAY COATING; TEMPERATURE DEPENDENCE; SHAPE MEMORY EFFECT; AMBIENT TEMPERATURE

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