Ultrasonic end-capping of beta"-alumina tubes

Details Ultrasonic end-capping of beta"-alumina tubes Ultrasonic end-capping of beta"-alumina tubes

1981-09-08

1982-12-21

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 731, 156 89, 15624413, 15624424, 264 23, 264 63, 2642091, 264332, B29C 2708, C04B 3544, C04B 3564

Patent

active

043647839

ABSTRACT:
This invention comprises a method of ultrasonically end-capping a tubular green body which comprises a mixture of 40-60 volume percent sinterable beta"-alumina precursor particulate and 60-40 volume percent organic sacrificial binder wherein said sacrificial binder comprises a thermoplastic elastomer, a plasticizer which may be oil, wax or oil and wax, stiffening polymers, a processing aid and optional components. The tube is preferably formed by extrusion molding. The green body tube may be end-capped by ultrasonic forming or by ultrasonic bonding of an end-cap to the tube. During this process, ultrasonic vibration energy is dissipated as heat energy which melts the thermoplastic binder composition and welds the joining surfaces.

REFERENCES:
patent: 3556884 (1971-01-01), McGrath
patent: 4158688 (1979-06-01), Pett et al.
patent: 4158689 (1979-06-01), Pett et al.
patent: 4289719 (1981-09-01), McIntosh et al.
Report entitled "Fabrication of Thin Layer Beta"-Alumina", by Gerald J. Tennenhouse and Robert A. Pett, prepared for the National Aeronautics and Space Administration and submitted pursuant to Contract NAS 3-1982.

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