Ceramic-metal assembly

Details Ceramic-metal assembly Ceramic-metal assembly

1977-03-10

1978-09-05

Kundrat, Andrew V.

Joints and connections

Utilizing thermal characteristic, e.g., expansion or...

403267, 403272, 228124, F16B 1100

Patent

active

041115724

ABSTRACT:
Magnetohydrodynamic devices using hot ionized gas as working fluid require channel refractories, insulators, and electrodes to be cooled at their reverse sides in order to carry away heat flux fast enough to keep obverse sides below melting point, since gas temperatures of roughly 2500.degree. C. exceed melting points of any available metals or ceramics. Common procedure of brazing ceramic to metal backing (which is more conveniently fastened in apparatus and cooled) creates only partially solvable problem of differential thermal expansion, or bad fit. Ceramic reverse is grooved with dovetailed or convergent slots against which brazing stock is placed for brazing to metal backing. During brazing, molten braze alloy enters grooves and forms mechanical lock which on test proves stronger than ceramic itself. Large expanses of ceramic may be grooved on obverse to insure that cracks resulting from thermal stress, especially thermal shock, will be regular and subdivide surface into smaller regular units which may still be used.

REFERENCES:
patent: 726026 (1903-04-01), Canda
patent: 2163409 (1939-06-01), Pulfrich
patent: 3029559 (1962-04-01), Treptow
patent: 3171519 (1965-03-01), Nolte
patent: 3302961 (1967-02-01), Franklin
patent: 3862488 (1975-01-01), Pessell et al.

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