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

1985-02-21

1986-10-07

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264150, 2642091, 2641761, C04B 3564

Patent

active

046158510

ABSTRACT:
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 sodium/sulfur battery. The method comprises extruding a mixture of 40-60 volume percent of sinterable particulate solids consisting essentially of a particle size distribution of beta"-alumina precursor particulate comprising alpha-alumina and 60-40 volume percent organic sacrificial binder consisting essentially of a thermoplastic block copolymer, plasticizers comprising two oils and two waxes, stiffening thermoplastic polymers and processing aids. In the preferred embodiment, the composition of the particulate comprises 8.85 weight percent Na.sub.2 O, 0.75 weight percent Li.sub.2 O and 90.4 weight percent Al.sub.2 O.sub.3 and the temperature of the material is maintained between about 135.degree.-150.degree. 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. The tubular green body is extruded over a mandrel.

REFERENCES:
patent: 3687735 (1972-08-01), Inoue
patent: 4158688 (1979-06-01), Pett et al.
patent: 4158689 (1979-06-01), Pett et al.
patent: 4265794 (1981-05-01), Pett et al.
patent: 4267086 (1981-05-01), Pett 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 NASA-19782.

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