Liquid phase sintering of bimodal size distributed alumina powder mixtures |
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| Authors: | S Taruta T Takano N Takusagawa K Okada N Ōtsuka |
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| Affiliation: | (1) Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, 500, Wakasato, Nagano-shi, 380 Nagano, Japan;(2) Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, 152 Tokyo, Japan;(3) Department of Materials, Faculty of Science and Engineering, The Nishi Tokyo University, 2525, Yatsusawa, Uenohara-machi, 409-01 Kitatsuru-gun Yamanashi, Japan;(4) Present address: Research and Development Center, Japan Insulation Co., Ltd, 4064-1, Kitanuma, Nodashinden Hozumi-cho Motosu-gun, 501-02 Gifa, Japan |
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| Abstract: | Fine and coarse alumina powder mixtures (non-additive specimen) and those containing the additive formed liquid phase during firing (additive specimen) were compacted and fired at 1400–1600°C. Liquid phase sintering proceeded markedly at 1400–1500°C and additive specimens had much higher relative density than non-additive specimens at 1500°C. As the liquid phase sintering proceeded, the open pore volume decreased abruptly, but the open pore size changed depending on the packing structure. The open pore size decreased in the specimens where the fine particles formed matrix structure, while it increased in the specimens where the coarse particles formed skeletal structure. At 1600°C all additive specimens having different mixing ratios of fine and coarse powders had similar microstructure and the same relative density of 97%. However, spherical large pores were formed and remained in all additive specimens even at 1600°C. The bending strength of those specimens was about 400 MPa. |
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