Ultrasonic end-capping of .beta. alumina tubes

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

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B29C 65/08 (2006.01) B29C 57/10 (2006.01) C04B 35/113 (2006.01) C04B 35/634 (2006.01) C04B 37/00 (2006.01) H01M 10/39 (2006.01)

Patent

CA 1185772

ABSTRACT OF THE DISCLOSURE This invention comprises a method of ultra- sonically 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 sacri- ficial 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.

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