Densification of Nanocrystalline Yttria by Low Temperature Spark Plasma Sintering期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Densification of Nanocrystalline Yttria by Low Temperature Spark Plasma Sintering

Authors:	Hidehiro Yoshida Koji Morita Byung-Nam Kim Keijiro Hiraga Masayasu Kodo Kohei Soga Takahisa Yamamoto

Affiliation:	National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan; Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan; Department of Advanced Materials Science, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan

Abstract:	We investigated the densification of undoped, nanocrystalline yttria (Y₂O₃) powder by spark plasma sintering (SPS) at sintering temperatures between 650°C and 1050°C at a heating rate of 10°C/min and an applied stress of 83 MPa. In spite of the low sinterability of the undoped Y₂O₃, a remarkable densification of the powder started at about 600°C, and a theoretical density of more than 97% was achieved at a sintering temperature of 850°C with a grain size of about 500 nm. The low temperature SPS is effective for fabricating dense Y₂O₃ polycrystals.

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