Method for forming a sealed outer ring for ceramic regenerator

Details Method for forming a sealed outer ring for ceramic regenerator Method for forming a sealed outer ring for ceramic regenerator

1975-09-17

1980-04-29

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264 48, 264 60, 264 69, 264260, B28B 126

Patent

active

042006040

ABSTRACT:
In the formation of cylindrically shaped heat regenerators from ceramic honeycomb structures for use in gas turbine engines, a gas-impervious seal of the peripheral honeycomb cells and a high strength outer ring are formed simultaneously in an apparatus which provides for surrounding the outer wall of the honeycomb structure with a castable ceramic composition suitable for forming the outer ring, contacting a peripheral area of the upper surface of the honeycomb structure defining a predetermined number of peripheral cell openings with a (different) ceramic slurry composition, evacuating the honeycomb cells whose openings are contacted with the slurry composition through corresponding openings in the lower surface of the honeycomb structure in order to promote flow of the slurry into the evacuated cells, thereby forming a gas impervious seal of these peripheral cells, while simultaneously vibrating the honeycomb structure and castable composition in order to promote flow and intimate contact of the castable composition with the outer wall of the structure, thereby to form an outer adherent layer of the castable composition on the wall of the structure. After drying, the honeycomb structure with the filled peripheral cells and the outer adherent layer of ceramic may be fired in the conventional manner to convert the structure to a unified ceramic regenerator having a sealed outer ring.

REFERENCES:
patent: 3434203 (1969-03-01), Thorp
patent: 3664853 (1972-05-01), Leonard
patent: 3839521 (1974-10-01), Robinson
patent: 3876449 (1975-04-01), Smith et al.
patent: 3877973 (1975-04-01), Ravault

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