Abstract: In order to determine the ultimate strength of β〞-Al2O3 ceramics tubes which are the key components of sodium-sulfur batteries，the size of ceramic tubes was measured by ruler，slide caliper and wall thickness gauge，and the blasting limit pressure was obtained by the hydrostatic pressure bursting test．The ultimate stress of the ceramic tube was calculated by using the approximate formulas of the thinwalled container subjected to the pressure and the design criteria of the first strength theory，and the main factors affecting the ultimate stress were analyzed，which provides some significant guideline to the strength check and the optimization design of the ceramic tube．
Key words: Na-S battery; ceramics tube; hydrostatic pressure; bursting test; ultimate stress
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