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Two-Stage Sintering of Alumina with Submicrometer Grain Size

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This work verifies the applicability of two-stage sintering as a means of suppressing the final stage grain growth of submicrometer alumina. The first heating step should be short at a relatively high-temperature (1400°–1450°C) in order to close porosity without significant grain growth. The second step at temperatures around 1150°C facilitates further densification with limited grain growth. Fine-grained alumina with a relative density of 98.8% and a grain size of 0.9 m was prepared by two-stage sintering. A standard sintering process resulted in ceramics with identical relative density and a grain size of 1.6 m.
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Document Type: Research Article

Affiliations: 1: Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic 2: Vitrum Laugaricio—Joint Glass Centre of IIC SAS, TnU AD and RONA, j.s.c., Trenčín, Slovak Republic

Publication date: 01 January 2007

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