D-K. Kim, W.M. Riven/Materials Science and Engineering 4 380(2004)237-244 M cm 1 mm (a) Imm 1 mm Fig. 6. Optical micrographs of the mullite-AlPO4, two-layer, fibrous mono- lithic composite, after binder removal. The fibrous monoliths were laid up into a rectangular sample for subsequent sectioning into bend tes Fig. 7. Optical micrographs of specimens filaments(M: matrix center rod (mullite), 1: interphase layer (AIPO4). The thickness of green interphase layer is 0.33 mm).(a) Monofil- ament rod and(b) multifilament rod. removal from the mullite-AlPO4 green pellet was studied by TGA. The results are presented in Fig. 5. The weight loss from room temperature to 900C consisted roughly of 5step:25-70,70-160,160-305,305-430,430-570,and 570-900C. This indicates how the binder was removed gradually over a wide temperature range. Fig. 6(a)is an optical micrograph of binder-free rectangular pellets and ig. 6(b) is the enlarged view of the surface. The sam- ple surface was clean and had no distortion after binder removal Fig. 7(a and b) are optical micrographs of green bod- ies of a monofilament rod and multifilament rod of the mullite-AlPO4 laminated composite. The interphase is dis- uished from th g aye The thickness of the AlPO4 interphase layer was 0.33 mm.A mm multifilament rod with diameter 2. 1 mm had approximately 93 two-layer, sub-cells in it. The microstructure of a green body of the two-layer, mullite-AlPO4 fibrous monolithic Fig. 8. Optical micrograph of the mullite-AlPO4 fibrous monolithic com- composite is shown in the optical micrograph of Fig. 8. The posite green body.D.-K. Kim, W.M. Kriven / Materials Science and Engineering A 380 (2004) 237–244 241 Fig. 6. Optical micrographs of the mullite-AlPO4, two-layer, fibrous mono￾lithic composite, after binder removal. The fibrous monoliths were laid up into a rectangular sample for subsequent sectioning into bend test specimens. removal from the mullite-AlPO4 green pellet was studied by TGA. The results are presented in Fig. 5. The weight loss from room temperature to 900 ◦C consisted roughly of 5 steps: 25–70, 70–160, 160–305, 305–430, 430–570, and 570–900 ◦C. This indicates how the binder was removed gradually over a wide temperature range. Fig. 6(a) is an optical micrograph of binder-free rectangular pellets and Fig. 6(b) is the enlarged view of the surface. The sam￾ple surface was clean and had no distortion after binder removal. Fig. 7(a and b) are optical micrographs of green bod￾ies of a monofilament rod and multifilament rod of the mullite-AlPO4 laminated composite. The interphase is dis￾tinguished from the matrix phase by a food coloring dye. The thickness of the AlPO4 interphase layer was 0.33 mm. A multifilament rod with diameter 2.1 mm had approximately 93 two-layer, sub-cells in it. The microstructure of a green body of the two-layer, mullite-AlPO4 fibrous monolithic composite is shown in the optical micrograph of Fig. 8. The Fig. 7. Optical micrographs of the mullite-AlPO4 fibrous monolithic composite filaments (M: matrix center rod (mullite), I: interphase layer (AlPO4). The thickness of green interphase layer is 0.33 mm). (a) Monofil￾ament rod and (b) multifilament rod. Fig. 8. Optical micrograph of the mullite-AlPO4 fibrous monolithic com￾posite green body