13421 Polymer Impregnation Process SiCSiC

The test samples for these experiments were 8-ply and 16-ply cloth in a two-dimensional lay-up. Each specimen was 20.3 by 20.3 cm square. Since the PIP process allows sample removal between successive processing cycles, the same panels were studied by thermal imaging and air-coupled ultrasound after 1, 5, 10, and 15 cycles. Results of thermal diffusivity imaging of the 8-ply panel are shown in Fig. 13.29. What is noted after 1 PIP cycle are two large delam-inated regions in the upper left and upper right corners. Visual inspection of the edge revealed ply separation. After 5 cycles, handling damage enlarged

FIGURE 13.29 Thermal diffusivity image data of 20.3-cm square, 8-ply, two-dimensional cloth lay-up, PIP processes SiC/SiC flat plate: (a) after 1 PIP cycle, (b) after 5 PIP cycles, and (c) after 10 PIP cycles.

FIGURE 13.29 Thermal diffusivity image data of 20.3-cm square, 8-ply, two-dimensional cloth lay-up, PIP processes SiC/SiC flat plate: (a) after 1 PIP cycle, (b) after 5 PIP cycles, and (c) after 10 PIP cycles.

16-Ply Lay-up

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