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Fabrication of Transparent Grain‐Oriented Polycrystalline Alumina by Colloidal Processing

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Grain‐oriented polycrystalline alumina (PCA) ceramics with very high, nearly single‐crystal transparency were successfully fabricated through colloidal processing in a high magnetic field followed by hot isostatic pressing. The c‐axis of the produced material was oriented along the direction parallel to the magnetic field. The transmittance of the specimen with a thickness of 0.8 mm was 78% at a wavelength of 650 nm, close to the reported value of 84.5% for sapphire and more than 10% higher than the largest transmittance magnitude ever reported for PCA ceramics. In addition, the Na salt of 4,5‐dihydroxy‐1,3‐benzenedisulfonic acid (named “Tiron”) was found to be a highly effective dispersant for processing high‐purity materials.
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Keywords: alumina; orientation; transparent ceramics

Document Type: Research Article

Publication date: October 1, 2016

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