Title:
SYNTHESIS METHOD OF SILICON CARBIDE WHISKERS USING SETAE OF RICE HULLS
Document Type and Number:
WIPO Patent Application WO/2011/152577
Kind Code:
A1
Abstract:
The present invention relates to a synthesis method of silicon carbide whiskers using setae of rice hulls, comprising: the mixing step of preparing material for synthesis by using the setae or mixing the setae and a carbon compound; the first heat treatment step of heating the material for synthesis at 200-1,000 ℃ for 2-24 hours; the impurities removing step of heating the first heat-treated material at 1,000-1,200 ℃ for 30 minutes to 3 hours to remove first impurities; the first synthesis step of heating the impurities-removed material at 1,200-1,500 ℃ for 5 minutes to 3 hours to generate a nucleus of silicon carbide whiskers; and the second synthesis step of heating the material passing through the first synthesis step at 1,550-2,000 ℃ for 5 minutes to 10 hours to grow the nucleus of silicon carbide whiskers, thereby preparing the silicon carbide whiskers. According to the present invention, whiskers are prepared by using setae instead of conventional rice hulls or carrying out synthesis with the setae and a carbon compound under optimum conditions, thereby improving a production yield of silicon carbide whiskers by three times or more compared with the conventional case, enhancing economical efficiency due to cheap material costs, and improving the quality of the prepared silicon carbide whiskers.
Inventors:
LEE YOUNG-JO (KR)
KIM JIN-YOUNG (KR)
CHUNG YONG-HO (KR)
KANG YOUNG-SHIN (KR)
KWON YONG DUK (KR)
KIM JIN-YOUNG (KR)
CHUNG YONG-HO (KR)
KANG YOUNG-SHIN (KR)
KWON YONG DUK (KR)
Application Number:
PCT/KR2010/003535
Publication Date:
December 08, 2011
Filing Date:
June 01, 2010
Export Citation:
Assignee:
SSANGYONG MATERIALS CORP (KR)
LEE YOUNG-JO (KR)
KIM JIN-YOUNG (KR)
CHUNG YONG-HO (KR)
KANG YOUNG-SHIN (KR)
KWON YONG DUK (KR)
LEE YOUNG-JO (KR)
KIM JIN-YOUNG (KR)
CHUNG YONG-HO (KR)
KANG YOUNG-SHIN (KR)
KWON YONG DUK (KR)
International Classes:
C01B31/36; B09B3/00; C09C1/28; C09C3/04
Other References:
R. V. KRISHNARAO: "Formation of SiC whiskers from rice husk silica-carbon black mixture: effect of preheat treatment", JOURNAL OF MATERIALS SCIENCE LETTERS, vol. 12, 1993, pages 1268 - 1271
R. V. KRISHNARAO ET AL.: "Formation of Sic from Rice Husk Silica-Carbon Black Mixture: Effect of Rapid Heating", CERAMICS INTERNATIONAL, vol. 22, 1996, pages 489 - 492
R. V. KRISHNARAO ET AL.: "Studies on the Formation of SiC Whiskers from Pulverized Rice Husk Ashes", CERAMICS INTERNATIONAL, vol. 18, 1992, pages 35 - 42
R. V. KRISHNARAO ET AL.: "Conversion of Raw Rice Husks to Sic by Pyrolysis in Nitrogen Atmosphere", JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 18, 1998, pages 147 - 152
R. V. KRISHNARAO ET AL.: "Formation of Sic from Rice Husk Silica-Carbon Black Mixture: Effect of Rapid Heating", CERAMICS INTERNATIONAL, vol. 22, 1996, pages 489 - 492
R. V. KRISHNARAO ET AL.: "Studies on the Formation of SiC Whiskers from Pulverized Rice Husk Ashes", CERAMICS INTERNATIONAL, vol. 18, 1992, pages 35 - 42
R. V. KRISHNARAO ET AL.: "Conversion of Raw Rice Husks to Sic by Pyrolysis in Nitrogen Atmosphere", JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 18, 1998, pages 147 - 152
Attorney, Agent or Firm:
CHO, YOUNG HYUN (KR)
조영현 (KR)
조영현 (KR)
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Claims: