Diffusion barrier and separation substance for metal parts adjoi

Details Diffusion barrier and separation substance for metal parts adjoi Diffusion barrier and separation substance for metal parts adjoi

1977-02-18

1978-08-01

Ansher, Harold

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

106 65, 106308B, 106309, 156325, 252 25, 427336, 427380, 427444, 428409, 428472, C01B 2106, C01B 3508, B32B 1504

Patent

active

041040961

ABSTRACT:
A diffusion barrier and separation substance for metal parts which adjoin each other in an oxygen-free, inert and preferably a helium-containing atmosphere such as used in a closed-cycle high temperature reactor or gas turbine comprises first and second adjoining metal parts with a hexagonal boron nitride placed between said parts. The hexagonal boron nitride is applied to the boundary surface of the metal parts in an aqueous or organic suspension prepared as a pasty, putty-like or brushable liquid substance. The substance contains from 5 to 50% of boron nitride, from 0.5 to 30% of binders and from 2 to 6% of swelling agents and 50 to 90% liquid suspension medium. The suspension medium may advantageously contain an anti corrosive agent and in addition the formed protective film is burned from 0.25 to 3 hours at a temperature of from 100.degree. to 500.degree. C.

REFERENCES:
patent: B750679 (1976-03-01), Rossi et al.
patent: 1337264 (1920-04-01), Podszus
patent: 2239530 (1941-04-01), Langenohl et al.
patent: 2439290 (1948-04-01), Fetterley
patent: 3058809 (1962-10-01), Taylor
patent: 3189477 (1965-06-01), Shaffer
patent: 3676343 (1972-07-01), Dietz
patent: 3771976 (1973-11-01), Wakefield
patent: 3876751 (1975-04-01), Alexeevsky et al.

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