Toughening and strengthening of translucent alumina

Isao YAMASHITA; Hitoshi NAGAYAMA; Naoki SHINOZAKI; Koji TSUKUMA

doi:10.2109/jcersj2.117.1052

Journal of the Ceramic Society of Japan

Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535

Express letter

Toughening and strengthening of translucent alumina

Isao YAMASHITA, Hitoshi NAGAYAMA, Naoki SHINOZAKI, Koji TSUKUMA

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Keywords: Translucent alumina, Fracture toughness, Bending strength, Hot isostatic pressing (HIP)

JOURNAL FREE ACCESS

2009 Volume 117 Issue 1369 Pages 1052-1054

DOI https://doi.org/10.2109/jcersj2.117.1052

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Abstract

Translucent alumina with anisotropic-grained microstructure was fabricated utilizing a small amount of glass-forming impurities and the hot isostatic pressing (HIP) method. Its total forward transmission at 600 nm is 72% (1 mm thickness), and bending strength and fracture toughness are estimated to be 649 MPa and 9.4 MPa·m^0.5, respectively. Bimodal structure composed of elongated anisotropic-grain and fine equi-axis grain is responsible for the enhancement of mechanical properties.

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