Shape memory effect during preparation of alumia ceramic tubes

Abstract

Pure alumina ceramic tube and 95 alumina ceramic (the ceramic with 95.84% alumina) tube were prepared by using self-prepared alumina micrometer powder without agglomeration as raw material. The ceramic green was shaped by isostatic pressing and sintered at different temperature from 800 to 1 600 °C for 2 h. The 95 ceramic tube sintered at 1 550 °C for 2 h had mean particle size of 4 μm, bend strength of 437 MPa and volume density of 3.714 g/cm³. Shape memory effect during sintering was observed. XRD results showed that no phase transition occurred during shape memory process, which indicated that shape memory effect was not caused by phase transition. Several probable causes of the alumina ceramic shape memory effect were discussed in this paper.

Keywords

shape memory effect / alumina superfine powder / isostatic pressing / alumina ceramic tube

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