Shrinkage control of cellular ceramic bodies having axial caviti

Details Shrinkage control of cellular ceramic bodies having axial caviti Shrinkage control of cellular ceramic bodies having axial caviti

1974-07-19

1977-03-29

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

291573R, 165 8, C04B 3332, B21D 5302

Patent

active

040149684

ABSTRACT:
Method of reducing the firing shrinkage of the axial hub opening in a disc-type cellular or honeycomb, ceramic heat exchanger by substantially filling the hub opening with a plug which undergoes substantially the same firing shrinkage as the hub opening. The plug then shrinks with the heat exchanger and keeps the hub opening closed, thereby preventing accelerated heating of the cellular ceramic nearest the hub opening and corresponding local increase in the firing shrinkage due to the accelerated heating. A plug with a bulk density closely approximating that of the ceramic matrix is desirable and a plug fashioned from the same cellular ceramic material as the matrix is particularly convenient and effective.

REFERENCES:
patent: 2102343 (1937-12-01), Whitcomb et al.
patent: 2467596 (1949-04-01), Pratt
patent: 3573021 (1971-03-01), Smith
Campbell, High Temperature Technology, pp. 354-355 (1956).

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