Preparation of .beta. alumina tubes by the extrusion process

Details Preparation of .beta. alumina tubes by the extrusion process Preparation of .beta. alumina tubes by the extrusion process

B - Operations, Transporting

28

B

25/131

B28B 21/52 (2006.01) B28B 3/20 (2006.01) C04B 35/00 (2006.01) C04B 35/10 (2006.01)

Patent

CA 1185771

ABSTRACT OF THE DISCLOSURE This invention relates to an extrusion method of preparing tubular green bodies, in particular those having thin walled thickness, which after burnout and sintering have properties similar or better than those of tubular bodies produced by isostatic pressing and are suitable for use in the Na/S battery. The method comprises extruding a mixture of 40-60 volume percent of beta"-alumina precursor particulate and 60-40 volume percent organic sacrificial binder consisting essentially of a thermoplastic block copolymer, plasticizers, stiffening thermoplastic polymers and processing aids. In the preferred embodiment, the composition of the particulate comprises 8.85 weight percent Na2O, 0.75 weight percent Li2O and 90.4 weight percent A12O3 and the temperature of the material is maintained between about 135 - 150°C during extrusion. The die used to extrude the mixture has a ratio of the length of the die to the wall thickness of the tubular green body extruded of greater than about 5:1.

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