Preprints of Annual Meeting of The Ceramic Society of Japan
Preprints of Fall Meeting of The Ceramic Society of Japan
Annual Meeting of The Ceramic Society of Japan, 2011
Session ID : 3K33
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Host: The Ceramic Society of Japan

Spark plasma sintering of Al2O3-cBN/SiO2 composite using RCVD SiO2 thin layer coated cBN powder
*Jianfeng Zhang, Rong Tu, Takashi Goto
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Keywords: cubic boron nitride (cBN), SiO2 thin layer coated cBN powder, rotary CVD, spark plasma sintering
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Abstract
SiO2 thin layer was coated on cBN (cBN/SiO2) by rotary chemical vapor deposition (RCVD) using tetraethoxysilane (TEOS) as a precursor. Al2O3-cBN/SiO2 composite was compacted by spark plasma sintering (SPS). The phase transformation temperature of cBN to hBN in Al2O3-cBN/SiO2 composite was 1773 K, 200 and 100 K higher than that in Al2O3-cBN/Ni and Al2O3-cBN composites, respectively. The highest relative density of Al2O3-cBN/SiO2 composite was 99.5% at 1673 K and 30 vol% cBN with 1.9 mass% SiO2. The maximum hardness of Al2O3-cBN/SiO2 was 28 GPa for Al2O3-30 vol% cBN/SiO2 (SiO2 content: 1.9 mass%) composite sintered at 1673 K and 100 MPa.
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© The Ceramic Society of Japan 2011
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