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B Saruhan et al. /Composites: Part A 32(2001)1095-1103 c as hot-pressed, 42. 4 GPa D1200c,2h,27GPa F 1300C, 1000h, cycl. 84 GPa E 1300C, 1000h, const. 84.6 GPa 0,2 04 6 strain [% c as hot-pressed,(106 GPa) stress [GPa] D1200c,2h,(87GPa F1300c,1000h,cyc.(117GPa) H 1300C, 1000h, const(81 GPa)-Different Batch strain [% Fig. 6. (a) Three-point bending curves of the composites with carbon(fugitive)-interphase after(C)hot-pressing, (D)after heat-treat heat-treatment at 1300C for 1000 1 ment at1300°cfor composites with carbon(fugitive)ZrOr-interphase(C)after hot-pressing, (D)after ment at 1200.C for 2 h(H)after 1000 h, cons, and(F) after heat-treatment at 1300C for 1000x I h, cycl. (c) Three-point bending the composites with c iterphase after(C)hot-pressing, (D)after heat-treatment at 1200.C for 2 h(H) after heat-treatment at 1300"C for 1000 h, cons and( F)after heat-treatment at 1300.C for 1000X I h, cycl. ZrOr-layer displayed a rather unique behaviour under cyclic 1200.C after 2 h of exposure. This led to the formation of conditions, yielding a less tighter appearance compared with dense matrix islands and the locally cumulated large pores, the continuously heated specimen(Fig. 5(b)) due to the pore diffusion and growth Under cyclic heat- The mullite matrix in all as-hot-pressed composites was treatment at 1300C, the extension of sintering was less homogeneously packed, but contained many finely distrib- obvious. In these composites, the pore volume distribution uted pores(approx. 40% porosity). Heat-treatment of the remained homogeneous and the size of dense islands wa composites led to localised sintering and an extensive relatively small pore diffusion within the matrix, starting already at The stress/strain behaviour of the composites after4 5' = & , 1J D122 - , 1 B)M 2 & , 8')). ' - , 9 8+)). , & < & A , & - 3 & 88)) #- & - . , / '0 10))2 )34)' J ( 1 2 - & , 1&2 1.2 102 8')). ' 12 8+)). 8))) 1J2 8+)). 8))) 8 12 - & , 1&234 5' 1.2 102 8')). ' 1 2 8+)). 8))) 1J2 8+)). 8))) 8 12 - & , 1&236'5+ 1.2 102 8')). ' 1 2 8+)). 8))) 1J2 8+)). 8))) 8