D.-H. Kuo, W.M. Kriven/ Materials Science and Engineering A210(1996)123-134 layers are about 25, 30 and 25 um for LP/A, LP/YAG and LP/LA1 laminates respectively, with 70 um thick Apoa ness of Al2O3, 38 um of YAG and 35 um of LAul.The volume fractions of LP in LP/A, LP/YAG and LP/ LAn laminates are about 26%, 44% and 42% respec tively. Although the three LP-containing laminates were fabricated successfully, the pure LP material was LaPO4 CAlso 1 mmw Y3Al6012 LaPo LaAl11018 50 Fig. 9. Optical micrographs of three as-fabricated LaAl11o18 LaPO4/Al O3 hot pressed at 1300C for 3 h:(b)LaP hot pressed at 1600C for 3 h;(c)LaPO4/ LaAl, O1s he Lipoate++ l600°for3h. 3. 2. Microstructure of laminated composite Three multilayered composites were fabricated by hot pressing at 1300C and 1600c giving uniform layer thicknesses. The laminates are shown in the optI- nates with indentation cracks:(a)LaPo/Al20, hot pressed at 1300 ree as-fabricated la cal micrographs of F and the scanning electron C for 3 h;(b)LaPO/Y3, O,2 hot pressed at 1600C for 3 h;(c) micrographs of Fig. 10. The thicknesses of the LP LaPO./ LaAl,O hot pressed at 1600%C for 3 h128 D.-H. Kuo, W.M. Kriven / Materials Science and Engineering A210 (1996) 123-134 layers are about 25, 30 and 25/xm for LP/A, LP/YAG and LP/LAll laminates respectively, with 70/tm thick￾ness of A1203, 38/tm of YAG and 35/zm of LA~1. The volume fractions of LP in LP/A, LP/YAG and LP/ LAI1 laminates are about 26%, 44% and 42% respec￾tively. Although the three LP-containing laminates were fabricated successfully, the pure LP material was Fig. 9. Optical micrographs of three as-fabricated laminates: (a) LaPO4/AI203 hot pressed at 1300 °C for 3 h; (b) LaPO4/Y3AIsOI2 hot pressed at 1600 °C for 3 h; (c) LaPO4/LaA12~O18 hot pressed at 1600 °C for 3 h. 3.2. Microstructure of laminated composites Three multilayered composites were fabricated by hot pressing at 1300 °C and 1600 °C giving uniform layer thicknesses. The laminates are shown in the opti￾cal micrographs of Fig. 9 and the scanning electron micrographs of Fig. 10. The thicknesses of the LP Fig. 10. Scanning electron micrographs of three as-fabricated lami￾nates with indentation cracks: (a) LaPO4/AI203 hot pressed at 1300 °C for 3 h; (b) LaPO4/Y3AIsOt2 hot pressed at 1600 °C for 3 h; (c) LapO4/LaAlliOls hot pressed at 1600 °C for 3 h