Regenerator seal
- Indianapolis, IN
A method for manufacturing a hot side regenerator cross arm seal assembly having a thermally stablilized wear coating with a substantially flat wear surface thereon to seal between low pressure and high pressure passages to and from the hot inboard side of a rotary regenerator matrix includes the steps of forming a flat cross arm substrate member of high nickel alloy steel; fixedly securing the side edges of the substrate member to a holding fixture with a concave surface thereacross to maintain the substrate member to a slightly bent configuration on the fixture surface between the opposite ends of the substrate member to produce prestress therein; applying coating layers on the substrate member including a wear coating of plasma sprayed nickel oxide/calcium flouride material to define a wear surface of slightly concave form across the restrained substrate member between the free ends thereon; and thereafter subjecting the substrate member and the coating thereon to a heat treatment of 1600.degree. F. for sixteen hours to produce heat stabilizing growth in the coating layers on the substrate member and to produce a thermally induced growth stress in the wear surface that substantially equalizes the prestress in the substrate whereby when the cross arm is removed from the fixture surface following the heat treatment step a wear face is formed on the cross arm assembly that will be substantially flat between the ends.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- AC04-76
- Assignee:
- General Motors Corporation (Detroit, MI)
- Patent Number(s):
- US 4284658
- OSTI ID:
- 863961
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
seal
method
manufacturing
hot
arm
assembly
thermally
stablilized
wear
coating
substantially
flat
surface
thereon
pressure
passages
inboard
rotary
matrix
steps
forming
substrate
nickel
alloy
steel
fixedly
securing
edges
holding
fixture
concave
thereacross
maintain
slightly
bent
configuration
opposite
produce
prestress
therein
applying
layers
including
plasma
sprayed
oxide
calcium
flouride
material
define
form
restrained
free
thereafter
subjecting
heat
treatment
1600
degree
sixteen
hours
stabilizing
growth
induced
stress
equalizes
whereby
removed
following
step
formed
substrate whereby
coating thereon
coating layer
regenerator seal
treatment step
substantially flat
thermally induced
plasma spray
seal assembly
heat treatment
nickel oxide
substantially equal
surface thereon
alloy steel
concave surface
plasma sprayed
nickel alloy
rotary regenerator
wear surface
arm assembly
produce heat
holding fixture
arm seal
/427/29/148/219/432/