matri Pyc interfa Fig. 6. Cracks in the SiC/Sic composite with high-Vy at 1900C:(a)deflected along Pyc/matrix interface and(b)deflected along Pyc/fiber interface. the excellent mechanical performances, the UTs (410 MPa), the [11] Park K, Vasilos T Processing, microstructure and mechanical properties of PLS (360 MPa)and the elastic modulus (a360 GPa ) with non-cat sed Sic continuous fbre/Sic composites. J Mater Sci alkali-resistant sintered Sic fiber stable to 2200.C Nature 1998: 391: 773-5 tailoring of appropriate fabrication temperature to fiber volume [131 Dong SM. Katoh Y Kohyama a Preparation of sic/sic composites by Hot fraction as follows: (1) high ductility type and(2) high strength 2003:86(1)26-32. type [14 Dong SM, Katoh Y, Kohyama A Processing optimization and mechanical References [15 Kohyama A, Dong SM, Katoh Y. Development of Sic/siC tes by nano- 1 mposites. In: Proceedings of the 5th international conference mperature ceramic matrix composites(HTCMC5) Ohio(USA): The re on high filtration and transient eutectic (NITE) process. ng Sci Proc 2002:23:311 [16] Katoh Y, Kohyama A, Nozawa T, Sato M. Sic/SiC com ceramics Society: 2004. p. 187-9 ines and nuclear reactors sa overview compos so [171 shimoda K. Park Js, Hinoki T. Kohyama A. Influence of pyrolytic carbon [3I Katoh Y, Snead LL Henager CH, Hasegawa A, Kohyama A, Riccardi B, et al. omposites by Nme process. Compos Technol 2008: 68(1): 98-105. [18] Katoh Y, Kohyal applications. J Nucl Mater 2007: 367-370(1): 659-71 rence on fusion eactor materials(ICFRM-11)prese [19l Rebillat F. Lamon. Guette A The concept of a strong interface to [5] Naslain R Materials design and processing of high temperature ceramic matrix Sic composites with a BN interphase. Acta Mater mposites: state of the art and future trends. Adv Compos Mater [20 Evans AG. Perspective on the development of high-toughness ceramics. J Am 161 ones R, Szweda A Petrak D. Polymer derived ceramic matrix composites. (211 Rebillat F. Lamon ) Naslain R, Curzio EL Feber MK,. Properties of 7 Kotani M, Inoue T, Kohyama A, Okamura K, Katoh Y Consolidation of polymer- erived Sic matrix composites: processing and microstructure. Compos [22] Shimoda K, Park JS, Hinoki T. Kohyama A. Influence of surface structure of Sic echnol2002:62(16)2 [8 Hino T, Hayashishita E, Kohyama A, Yamauchi Y, Hirohata Y. Helium gas roscopy on basic bility of Sic/Sic composite after heat cycles. J Nucl Mater 2007: 36 characteristics. Appl Surf Sci 2007: 253(24): 9450-6. 370(1):736-41 [23] Levin EM, Robbins CR, McMurdie HE Phase diagrams for ceramists. The nposites by the combined fabrication process of ICVi and NITE methods. J [24] Hull D, Clyne TV aterials. 2nd ed. England: Cambring University Press: 1996. [10)Yoshida K, Yano T. Room and high-temperature mechanical and thermal 1251 Yoshida K, imai, Yano ts Improvement of the operties of hot- properties of Sic fiber-reinforced previous Sic composite sintered under composites by polycarbosilane impregnation Compos Sci Technol 2001: 61(9): 1323-9the excellent mechanical performances, the UTS (410 MPa), the PLS (360 MPa) and the elastic modulus (360 GPa) with non-cat￾astrophic fracture behavior. Through NITE process, SiC/SiC com￾posites with two fracture types were successfully developed by tailoring of appropriate fabrication temperature to fiber volume fraction as follows: (1) high ductility type and (2) high strength type. References [1] DiCarlo JA. Microstructural optimization of high temperature SiC/SiC composites. In: Proceedings of the 5th international conference on high temperature ceramic matrix composites (HTCMC5). Ohio (USA): The American Ceramics Society; 2004. p. 187–92. [2] Naslain R. Design, preparation and properties of non-oxide CMCs for application in engines and nuclear reactors: an overview. Compos Sci Technol 2004;64(2):155–70. [3] Katoh Y, Snead LL, Henager CH, Hasegawa A, Kohyama A, Riccardi B, et al. Current status and critical issues for development of SiC composites for fusion applications. J Nucl Mater 2007;367–370(1):659–71. [4] Low IM, editor. Ceramic matrix composites – microstructure, properties and applications. England: Woodhead Publishing; 2006. [5] Naslain R. Materials design and processing of high temperature ceramic matrix composites: state of the art and future trends. Adv Compos Mater 1996;8(1):3–16. [6] Jones R, Szweda A, Petrak D. Polymer derived ceramic matrix composites. Composites: Part A 1999;30(4):569–75. [7] Kotani M, Inoue T, Kohyama A, Okamura K, Katoh Y. Consolidation of polymer￾derived SiC matrix composites: processing and microstructure. Compos Technol 2002;62(16):2179–88. [8] Hino T, Hayashishita E, Kohyama A, Yamauchi Y, Hirohata Y. Helium gas permeability of SiC/SiC composite after heat cycles. J Nucl Mater 2007;367– 370(1):736–41. [9] Shimoda K, Hinoki T, Katoh Y, kohyama A. Development of the tailored SiC/SiC composites by the combined fabrication process of ICVI and NITE methods. J Nucl Mater 2009;384(2):103–8. [10] Yoshida K, Yano T. Room and high-temperature mechanical and thermal properties of SiC fiber-reinforced previous SiC composite sintered under pressure. J Nucl Mater 2000;283–287(1):560–4. [11] Park K, Vasilos T. Processing, microstructure and mechanical properties of hot-pressed SiC continuous fibre/SiC composites. J Mater Sci 1997;32(2):295–300. [12] Ishikawa T, Kohtoku Y, Kumagawa K, Yamamura T, Nagasawa T. High-strength alkali-resistant sintered SiC fiber stable to 2200 C. Nature 1998;391:773–5. [13] Dong SM, Katoh Y, Kohyama A. Preparation of SiC/SiC Composites by Hot pressing, using Tyranno-SA fiber as reinforcement. J Am Ceram Soc 2003;86(1):26–32. [14] Dong SM, Katoh Y, Kohyama A. Processing optimization and mechanical evaluation of hot pressed 2D Tyranno-SA/SiC composites. J Eur Ceram Soc 2003;23(8):1223–31. [15] Kohyama A, Dong SM, Katoh Y. Development of SiC/SiC composites by nano￾infiltration and transient eutectic (NITE) process. Ceram Eng Sci Proc 2002;23:311–8. [16] Katoh Y, Kohyama A, Nozawa T, Sato M. SiC/SiC composites through transient eutectic-phase route for fusion applications. J Nucl Mater 2004;329– 333(1):587–91. [17] Shimoda K, Park JS, Hinoki T, Kohyama A. Influence of pyrolytic carbon interface thickness on microstructure and mechanical properties of SiC/SiC composites by NITE process. Compos Technol 2008;68(1):98–105. [18] Katoh Y, Kohyama A, Nozawa T. SiC/SiC composites through transient eutectic￾phase route for fusion applications. In: 11th international conference on fusion reactor materials (ICFRM-11) presented at Kyoto, Japan; 2003. [19] Rebillat F, Lamon J, Guette A. The concept of a strong interface applied to SiC/ SiC composites with a BN interphase. Acta Mater 2000;48(18- 19):4609–46018. [20] Evans AG. Perspective on the development of high-toughness ceramics. J Am Ceram Soc 1990;73(2):187–206. [21] Rebillat F, Lamon J, Naslain R, Curzio EL, Feber MK, Besmann TM. Properties of multilayered interphases in SiC/SiC chemical-vapor-infiltrated composites with ‘weak’ and ‘strong’ interfaces. J Am Ceram Soc 1998;81(9):2315–26. [22] Shimoda K, Park JS, Hinoki T, Kohyama A. Influence of surface structure of SiC nano-sized powder analyzed by X-ray photoelectron spectroscopy on basic powder characteristics. Appl Surf Sci 2007;253(24):9450–6. [23] Levin EM, Robbins CR, McMurdie HE. Phase diagrams for ceramists. The American Ceramic Society; 1969. p. 165. [24] Hull D, Clyne TW. An introduction to composite materials. 2nd ed. England: Cambring University Press; 1996. [25] Yoshida K, Imai M, Yano T. Improvement of the mechanical properties of hot￾pressed silicon-carbide-fiber-reinforced silicon carbide composites by polycarbosilane impregnation. Compos Sci Technol 2001;61(9):1323–9. Fig. 6. Cracks in the SiC/SiC composite with high-Vf at 1900 C: (a) deflected along PyC/matrix interface and (b) deflected along PyC/fiber interface. 1628 K. Shimoda et al. / Composites Science and Technology 69 (2009) 1623–1628