Densification and microstructure of Al_2O_3-cBN composites prepared by spark plasma sintering(<Feature>SiAlons and Non-oxides)
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概要
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Al_2O_3-cubic boron nitride (cBN) composites were prepared from Al_2O_3 and cBN powders by spark plasma sintering (SPS) at temperatures of 1200 to 1600℃ for 600 s under a pressure of 100 MPa. Densification, phase transformation, microstructure and mechanical properties of the Al_2O_3-cBN composites were investigated. Fully dense Al_2O_3-cBN composites containing 10 to 20 vol% cBN with a relative density of more than 98% were obtained at 1300℃ for 600 s without the phase transformation from cBN to hexagonal BN (hBN). The transformation of cBN was more greatly accelerated in the Al_2O_3-cBN composite than in cBN. The cBN phase to Al_2O_3 inhibited the grain growth of Al_2O_3 in the Al_2O_3-cBN composite. Vickers hardness of dense Al_2O_3-cBN composites containing 10 to 20 vol% cBN sintered at 1300℃ showed the maximum value of 26 GPa. The Al_2O_3-cBN composite containing 20 vol% cBN sintered at 1300℃ had the highest fracture toughness of 4.1 MPa・m^<1/2>.
- 社団法人日本セラミックス協会の論文
- 2008-06-01
著者
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GOTO Takashi
Institute for Materials Research, Tohoku University
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Hotta Mikinori
Inst. For Materials Res. Tohoku Univ.
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Goto Takashi
Institute For Material Research Tohoku University
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HOTTA Mikinori
Institute for Materials Research, Tohoku University
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