Silicon Carbide Fibers from Copolymers of Commercial Polycarbosilane and Silazane

Guang J. Choi

Journal of Industrial and Engineering Chemistry, Vol.3, No.3, 223-228, September, 1997

Clean Technology Research Center, Korea Institute of Science and Technology, Seoul 130-650, Korea

A new approach to prepare silicon carbide fibers by a non-oxidative chemical crosslinking of a commercial, low molecular weight polycarbosilane via copolymerization with vinyl silazane monomer was investigated. Dicumyl peroxide was used as an initiator for copolymerization reactions. SiC fibers were Produced by pyrolyzing the spun Polymer fibers at 1000℃ without any additional curing Process. The ceramic yield upon pyrolysis was 65-70%. According to neutron activation analysis, the oxygen content of our copolymer- derived SiC fibers was less than 3 wt%. The tensile strength of our SiC fibers increased slightly after 1400℃ heat-treatment while it dropped greatly after 1500 ℃ treatment.

[References]

Galasso FS, Advanced Fibers, and Composites, Gordon & Breach Science, New York (1989)
Yajima S, Hayashi J, Omori M, Chem. Lett., 931 (1975)
"Technical Data Sheet for Polycarbosilane X9-6348," Dow Corning (1992)
Narisawa M, Kitano S, Okamura K, Itoh M, J. Am. Ceram. Soc., 78, 3405 (1995)
Toreki W, Batich CD, Sacks MD, Saleem M, Choi GJ, Morrone A, Compos. Sci. Technol., 51, 145 (1994)
Sugimoto M, Shimoo T, Okamura K, Seguchi T, J. Am. Ceram. Soc., 78, 1013 (1995)
Sugimoto M, Shimoo T, Okamura K, Seguchi T, J. Am. Ceram. Soc., 78, 1849 (1995)
Takeda M, Imai Y, Ichikawa H, Ishikawa T, Kasai N, Seguchi T, Okamura K, Ceram. Eng. Sci. Proc., 14, 540 (1993)
Jakubenas K, Marcus HL, J. Am. Ceram. Soc., 78, 2263 (1995)
Bunsell AR, Simon G, Compos. Sci. Technol., 27, 157 (1986)
Clark TJ, Prack ER, Haider MI, Sawyer LC, Ceram. Eng. Sci. Proc., 8, 717 (1987)
Bender BA, Wallace JS, Schrodt DJ, J. Mater. Sci., 26, 970 (1991)
Kim H, Moorhead AJ, J. Am. Ceram. Soc., 74, 666 (1991)
Luthra KL, J. Am. Ceram. Soc., 74, 1095 (1991)
Toreki W, Choi GJ, Batich CD, Sacks MD, Saleem M, Ceram. Eng. Sci. Proc., 13, 198 (1992)
Toreki W, Batich CD, Sacks MD, Morrone AA, Ceram. Eng. Sci. Proc., 11, 1371 (1990)
"Standard test method for tensile strength and Young's modulus for high-modulus single filament materials," ASTM D 3379-5 (approved 1982), Philadelphia, PA, U.S.A. (1982)
Choi GJ, "Chemical Modifications of Polymer-Derived Silcon Carbide Fibers to Enhance Thermomechanical Stability," Ph.D. Dissertation, University of Florida (1993)
Brundle CR, Evans CA, Wilson S, Encyclopedia of Materials Characterization, Butterworth-Heinemann, Boston, 671-679 (1992)
McClune WF, Powder Diffraction File: Inorganic Phases, International Center for Diffraction Data, Swarthmore, PA, U.S.A. (1988)

[Referenced By]

[1] Galasso FS, Advanced Fibers, and Composites, Gordon & Breach Science, New York (1989)

[2] Yajima S, Hayashi J, Omori M, Chem. Lett., 931 (1975)

[3] "Technical Data Sheet for Polycarbosilane X9-6348," Dow Corning (1992)

[4] Narisawa M, Kitano S, Okamura K, Itoh M, J. Am. Ceram. Soc., 78, 3405 (1995)

[5] Toreki W, Batich CD, Sacks MD, Saleem M, Choi GJ, Morrone A, Compos. Sci. Technol., 51, 145 (1994)

[6] Sugimoto M, Shimoo T, Okamura K, Seguchi T, J. Am. Ceram. Soc., 78, 1013 (1995)

[7] Sugimoto M, Shimoo T, Okamura K, Seguchi T, J. Am. Ceram. Soc., 78, 1849 (1995)

[8] Takeda M, Imai Y, Ichikawa H, Ishikawa T, Kasai N, Seguchi T, Okamura K, Ceram. Eng. Sci. Proc., 14, 540 (1993)

[9] Jakubenas K, Marcus HL, J. Am. Ceram. Soc., 78, 2263 (1995)

[10] Bunsell AR, Simon G, Compos. Sci. Technol., 27, 157 (1986)

[11] Clark TJ, Prack ER, Haider MI, Sawyer LC, Ceram. Eng. Sci. Proc., 8, 717 (1987)

[12] Bender BA, Wallace JS, Schrodt DJ, J. Mater. Sci., 26, 970 (1991)

[13] Kim H, Moorhead AJ, J. Am. Ceram. Soc., 74, 666 (1991)

[14] Luthra KL, J. Am. Ceram. Soc., 74, 1095 (1991)

[15] Toreki W, Choi GJ, Batich CD, Sacks MD, Saleem M, Ceram. Eng. Sci. Proc., 13, 198 (1992)

[16] Toreki W, Batich CD, Sacks MD, Morrone AA, Ceram. Eng. Sci. Proc., 11, 1371 (1990)

[17] "Standard test method for tensile strength and Young's modulus for high-modulus single filament materials," ASTM D 3379-5 (approved 1982), Philadelphia, PA, U.S.A. (1982)

[18] Choi GJ, "Chemical Modifications of Polymer-Derived Silcon Carbide Fibers to Enhance Thermomechanical Stability," Ph.D. Dissertation, University of Florida (1993)

[19] Brundle CR, Evans CA, Wilson S, Encyclopedia of Materials Characterization, Butterworth-Heinemann, Boston, 671-679 (1992)

[20] McClune WF, Powder Diffraction File: Inorganic Phases, International Center for Diffraction Data, Swarthmore, PA, U.S.A. (1988)