K. Yoshida et al. Composites Science and Technology 61(2001)1323-1329 4. Conclusions [11] Corelli CH, Hoole J, Lazzaro J, Lee Cw. Mechanical, thermal, nd microstructural properties of neutron-irradiated SiC. J Am Green sheets of SiC with AlO Y2O3-CaO sintering Ceram Soc1983:66(7):529-37 additives prepared by the doctor-blade method and poly- [12 Price R. Properties o slicon carbide tor nuclear fuel partic carbosilane(PCS)-impregnated 2D woven Hi-Nicalon [13] Wu CH, Bonal JP Kryger B. The effect of high-dose neutron cloth with BN-coating were used for the fabrication of irradiation on the properties of graphite and silicon carbide. J Sic/SiCr composite by hot-pressing at 1650-17500C. Two Nucl Mater 1994: 208(I and 2): 1-7. kinds of SiC/SiCr composites with different volume frac- [14 Suzuki T. Yano T, Mori T, Miyazaki H, Iseki T Neutron irradia- tions of fibers were fabricated and their room tempera- tion damage of silicon carbide. Fusion Technol 1995: 27(3): 314-25. [5 Strife JR, Brennan JJ, Prewo KM. Status of continuous fiber- ture mechanical properties were evaluated reinforced ceramic matrix composite processing technology cPCS-impregnation into Hi-Nicalon cloth was an Ceram Eng Sci Proc 1990: 11(7-8): 871-919 Tective way to form the matrix between fibers. The [16] Geoghegan PJ. Chemical vapor infiltrated composites. In composites fabricated in this study showed non-brittle fracture behavior. Maximum strength of the composite ican Society of Mechanical Engineers, 1992. p. 113-23n SR, editor. Flight-vehicle materials, structures and dynar assessment and future directions. vol. 3. New York. with 52 vol. of fibers was about twice as high as that [7 Hurwitz FI. Polymeric precursors for fibers and matrices. In of the composite with 40 vol. of fibers, and the com- Levine Sr, editor. Flight-vehicle materials, structures and posite hot-pressed at 1700C showed higher maximum dynamics-assessment and future directions, vol. 3. New York: strength than the composites hot-pressed at 1650 and The American Society of Mechanical Engineers, 1992. P 59-77 1750%C. Fracture energy increased with lowering sinter- [18] Yano T, Budiyanto, Yoshida K, Iseki T Fabrication of silicon ing temperature. These results indicate sintering tem- carbide fiber-reinforced silicon carbide composite by hot-press. ing. Fusion Eng design 1998: 41: 157-63. perature affects the characteristics of interfacial bonding [19] Yoshida K, Budiyanto, Imai M, Yano T. Processing and micro- between fiber and matrix in the SiC/SiCr composite of cture of silicon carbide fiber-reinforced silicon carb the present study posite by hot-pressing. J Nucl Mater 1998: 258-263: 1960-5 20 Yoshida K, Imai M, Yano T. Microstructure and mechanical properties of hot-pressed silicon carbide fiber-reinforced silicon carbide composite. Key Eng Mater 1999: 164-165: 217-20 Acknowledgements 21] Nakano K, Sasaki K, Saka H, Fujikawa M, Ichikawa H. SiC- This work was partly supported by the Research for Evans AG. Naslain R. editors. Ceramic transactions. voL 58 the Future Program(RFTF97R12101)from JSPS and a High-temperature ceramic-matrix composites Il: manufacturing and materials development. Westerville(OH): American Ceramic Grant-in-Aid for JSPS fellows from the Ministry of Society,1995.p.215-29 Education, Science, Sports and Culture of Japan 22] Mitomo M, Kim Yw. Hirotsuru H. Fabrication of silicon car- bide nanoceramics. J Mater Sci 1996: 11(7): 1601-4 23 Shimo T, Sugimoto M, Okamura K. Kinetics of curing poly. arbosilane fiber by oxidation treatment. J. Ceram. Soc. Japan References 1991: 99: 514-9(in Japanese) 24 Kakimoto K, Wakai F, Bill J, Aldinger F. Synthesis of Si-C-O [1 Herbell TP Sanders WA. Monolithic ceramics. In: Levine SR, bulk ceramics with various chemical compositions from poly editor. Flight-vehicle materials, structures and dynamics-asses carbosilane. J Am Ceram Soc 1999: 82. 2337-41 nent and future directions, vol 3. New York: The American [25] Ishikawa T, Kajii S, Matsunaga K, Hogami T, Kohtoku Y Society of Mechanical Engineers, 1992. p 19-41 Nagasawa T. A tough, thermally conductive silicon carbide [2 Whalen TJ. Processing and properties of structural silicon car. bide Ceram Eng Sci Proc 1986: 7(9-10): 1135-43. 1998;282:1295-7 3 Rovner JH, Hopkins GR. Ceramic materials for fusion. Nucl [26] Yoshida K, Imai M, Yano T. Room- and elevated-temperature Tech19762903):274302. mechanical properties of SiC fiber-reinforced Sic composites 4 Hopkins GR, Price RJ. Fusion reactor design with ceramics fabricated by CVI and PIP methods. J Ceram Soc Japan Nucl Eng Design/Fusion 1985: 2(I and 2): 111-43 2000108(3):224-9. 5 Jones RH, Henager Jr CH, Hollenberg Gw. Composite materials [27] Ichikawa H, Okamura K, Seguchi T Oxygen-free ceramic fibers for fusion applications. J Nucl Mater 1992: 191-194: 75-83. om organosilicon precursors and e-beam curing. In: Evans AG [6 Fenici P, Scholz Hw. Advanced-low activation materials. Fiber. Naslain R. editors. Ceramic transactions. vol. 58. high-tem inforced ceramic composites. J Nucl Mater 1994: 212-215: 60-8 ture ceramic-matrix composites Il: manufacturing and materials [7 Snead LL, Jones RH, Kohyama A, Fenici P. Status of silicon development. Westerville(OH): American Ceramic Society, 1995 p.6574 [8 Jones RH, Henager Jr CH, Youngblood GE, Heinisch HL SiC/ [28] Chollon G, Pailler R, Naslain R, Laanani F, Monthioux M, Olry Sic composites for structural applications in fusion energy sys- P. Thermal stability of a PCS-derived SiC fibre with a low oxygen tems Fusion Technol 1996: 30(3): 969-76. [9 Donato A, Andreani R. Material requirements and perspectives [29] Shimoo T, Tsukada I, Narisawa M, Seguchi T, Okamura K. for future thermonuclear fusion reactors. Fusion Technol Change in properties of polycarbosilane-derived SiC fibers at high temperatures. J Ceram Soc Japan 1997: 105(7): 559-63 [10 Harrison SD, Corelli JC. Microstructure of neutron irradiation- [30 Yano T, Yamamoto Y, Yoshida K. TEM investigation and nduced defects in sintered and siliconized SiC. J Nucl Mater fracture behavior of SiC/SiC composites fabricated by hot-press. 1984:122and123:833-9 ng. Key Eng Mater 1999: 166: 135-84. Conclusions Green sheets of SiC with Al2O3–Y2O3–CaO sintering additives prepared by the doctor-blade method and poly￾carbosilane (PCS)-impregnated 2D woven Hi-Nicalon cloth with BN-coating were used for the fabrication of SiC/SiCf composite by hot-pressing at 1650–1750
C. Two kinds of SiC/SiCf composites with different volume frac￾tions of fibers were fabricated and their room tempera￾ture mechanical properties were evaluated. PCS-impregnation into Hi-Nicalon cloth was an effective way to form the matrix between fibers. The composites fabricated in this study showed non-brittle fracture behavior. Maximum strength of the composite with 52 vol.% of fibers was about twice as high as that of the composite with 40 vol.% of fibers, and the com￾posite hot-pressed at 1700
C showed higher maximum strength than the composites hot-pressed at 1650 and 1750
C. Fracture energy increased with lowering sinter￾ing temperature. These results indicate sintering tem￾perature affects the characteristics of interfacial bonding between fiber and matrix in the SiC/SiCf composite of the present study. Acknowledgements This work was partly supported by the Research for the Future Program (RFTF97R12101) from JSPS and a Grant-in-Aid for JSPS fellows from the Ministry of Education, Science, Sports and Culture of Japan. References [1] Herbell TP, Sanders WA. Monolithic ceramics. In: Levine SR, editor. Flight-vehicle materials, structures and dynamics-assess￾ment and future directions, vol. 3. New York: The American Society of Mechanical Engineers, 1992. p. 19–41. [2] Whalen TJ. Processing and properties of structural silicon car￾bide. Ceram Eng Sci Proc 1986;7(9-10):1135–43. [3] Rovner JH, Hopkins GR. Ceramic materials for fusion. Nucl Tech 1976;29(3):274–302. [4] Hopkins GR, Price RJ. Fusion reactor design with ceramics. Nucl Eng Design /Fusion 1985;2(1 and 2):111–43. [5] Jones RH, Henager Jr CH, Hollenberg GW. Composite materials for fusion applications. J Nucl Mater 1992;191-194:75–83. [6] Fenici P, Scholz HW. Advanced-low activation materials. Fiber￾reinforced ceramic composites. J Nucl Mater 1994;212-215:60–8. [7] Snead LL, Jones RH, Kohyama A, Fenici P. Status of silicon carbide composites for fusion. J Nucl Mater 1996;233-237:26–36. [8] Jones RH, Henager Jr CH, Youngblood GE, Heinisch HL. SiC/ SiC composites for structural applications in fusion energy sys￾tems. Fusion Technol 1996;30(3):969–76. [9] Donato A, Andreani R. Material requirements and perspectives for future thermonuclear fusion reactors. Fusion Technol 1996;29(1):58–72. [10] Harrison SD, Corelli JC. Microstructure of neutron irradiation￾induced defects in sintered and siliconized SiC. J Nucl Mater 1984;122 and 123:833–9. [11] Corelli CH, Hoole J, Lazzaro J, Lee CW. Mechanical, thermal, and microstructural properties of neutron-irradiated SiC. J Am Ceram Soc 1983;66(7):529–37. [12] Price RJ. Properties of silicon carbide for nuclear fuel particle coatings. Nucl Technol 1977;35(2):320–36. [13] Wu CH, Bonal JP, Kryger B. The effect of high-dose neutron irradiation on the properties of graphite and silicon carbide. J Nucl Mater 1994;208(1 and 2):1–7. [14] Suzuki T, Yano T, Mori T, Miyazaki H, Iseki T. Neutron irradia￾tion damage of silicon carbide. Fusion Technol 1995;27(3):314–25. [15] Strife JR, Brennan JJ, Prewo KM. Status of continuous fiber￾reinforced ceramic matrix composite processing technology. Ceram Eng Sci Proc 1990;11(7-8):871–919. [16] Geoghegan PJ. Chemical vapor infiltrated composites. In: Levine SR, editor. Flight-vehicle materials, structures and dynamics￾assessment and future directions, vol. 3. New York: The Amer￾ican Society of Mechanical Engineers, 1992. p. 113–37. [17] Hurwitz FI. Polymeric precursors for fibers and matrices. In: Levine SR, editor. Flight-vehicle materials, structures and dynamics-assessment and future directions, vol. 3. New York: The American Society of Mechanical Engineers, 1992. p. 59–77. [18] Yano T, Budiyanto, Yoshida K, Iseki T. Fabrication of silicon carbide fiber-reinforced silicon carbide composite by hot-press￾ing. Fusion Eng Design 1998;41:157–63. [19] Yoshida K, Budiyanto, Imai M, Yano T. Processing and micro￾structure of silicon carbide fiber-reinforced silicon carbide com￾posite by hot-pressing. J Nucl Mater 1998;258-263:1960–5. [20] Yoshida K, Imai M, Yano T. Microstructure and mechanical properties of hot-pressed silicon carbide fiber-reinforced silicon carbide composite. Key Eng Mater 1999;164-165:217–20. [21] Nakano K, Sasaki K, Saka H, Fujikawa M, Ichikawa H. SiC￾and Si3N4-matrix composites according to the hot-pressing route. In: Evans AG, Naslain R, editors. Ceramic transactions, vol. 58, High-temperature ceramic-matrix composites II: manufacturing and materials development. Westerville (OH): American Ceramic Society, 1995. p. 215–29. [22] Mitomo M, Kim YW, Hirotsuru H. Fabrication of silicon car￾bide nanoceramics. J Mater Sci 1996;11(7):1601–4. [23] Shimoo T, Sugimoto M, Okamura K. Kinetics of curing poly￾carbosilane fiber by oxidation treatment. J. Ceram. Soc. Japan 1991; 99: 514–9 (in Japanese). [24] Kakimoto K, Wakai F, Bill J, Aldinger F. Synthesis of Si-C-O bulk ceramics with various chemical compositions from poly￾carbosilane. J Am Ceram Soc 1999;82:2337–41. [25] Ishikawa T, Kajii S, Matsunaga K, Hogami T, Kohtoku Y, Nagasawa T. A tough, thermally conductive silicon carbide composite with high strength up to 1600
C in air. Science 1998;282:1295–7. [26] Yoshida K, Imai M, Yano T. Room- and elevated-temperature mechanical properties of SiC fiber-reinforced SiC composites fabricated by CVI and PIP methods. J Ceram Soc Japan 2000;108(3):224–9. [27] Ichikawa H, Okamura K, Seguchi T. Oxygen-free ceramic fibers from organosilicon precursors and e-beam curing. In: Evans AG, Naslain R, editors. Ceramic transactions, vol. 58, high-tempera￾ture ceramic-matrix composites II: manufacturing and materials development. Westerville (OH): American Ceramic Society, 1995. p. 65–74. [28] Chollon G, Pailler R, Naslain R, Laanani F, Monthioux M, Olry P. Thermal stability of a PCS-derived SiC fibre with a low oxygen content (Hi-Nicalon). J Mater Sci 1997;32:327–47. [29] Shimoo T, Tsukada I, Narisawa M, Seguchi T, Okamura K. Change in properties of polycarbosilane-derived SiC fibers at high temperatures. J Ceram Soc Japan 1997;105(7):559–63. [30] Yano T, Yamamoto Y, Yoshida K. TEM investigation and fracture behavior of SiC/SiC composites fabricated by hot-press￾ing. Key Eng Mater 1999;166:135–8. K. Yoshida et al. / Composites Science and Technology 61 (2001) 1323–1329 1329