| 摘要 |
<p>The prod. is esp. sodium beta alumina(SBA); and is made by mixing alumina and Na2CO3 powders to obtain ratio(R) of Al2O3/Na2O within prescribed limits. The mixt. is heated in an open crucible; cooled; and moulded. The mouldings are sintered in a chamber made of refractory, esp. concrete, the inner walls of the chamber being coated with a layer of SBA of the same compsn. as the mouldings. The layer of SBA is the chamber creates an atmos. rich in sodium near the mouldings, and sintering is for 1/2-4 hours at 1600-1700 degrees C., followed by natural cooling of the chamber to room temp. The chamber pref. consists of a tube closed by a top and bottom plate. The ratio(R) is pref. 5-11, and the layer is pref. cast using a barbotine. Used esp. for the mfr. of SBA solid electrolyte for use in sodium/sulphur batteries, where the invention provides a less costly sintering method as compared with FR 75.</p> |
