J 150 8 100 W 50

Strength (MPa)

FIGURE 13.20 Correlation between stress-wave factor and retained strength of alu-mina-mullite and clad-bonded SiC hot-gas filters.

FIGURE 13.21 Photograph of automated acousto-ultrasound system for study of rigid-ceramic hot-gas candle filters.

the correlations shown in Fig. 13.20. An increasing stress-wave factor correlates with increasing strength. The acousto-ultrasound method has been automated; see Fig. 13.21. Two-wheel transducers are used as the send-receive transducers, and linear motion is controlled via a computer-controlled stepper motor.

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