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Fabrication of Transparent Grain‐Oriented Polycrystalline Alumina by Colloidal Processing
Author(s) -
Pringuet Antoine,
Takahashi Takuma,
Baba Shoko,
Kamo Yuta,
Kato Zenji,
Uematsu Keizo,
Tanaka Satoshi
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14476
Subject(s) - materials science , crystallite , transmittance , fabrication , sapphire , transparent ceramics , ceramic , composite material , hot isostatic pressing , tiron , grain size , sintering , optics , optoelectronics , metallurgy , laser , nuclear magnetic resonance , medicine , alternative medicine , physics , pathology , enzyme , superoxide
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.