Tr. Jonas et al., CAPACITANCE MONITORING OF THE INFILTRATION OF CERAMIC PARTICULATE PREFORMS WITH LIQUID-METALS AT 750 TO 850-DEGREES-C, Journal of materials engineering and performance, 2(3), 1993, pp. 375-382
The authors previously developed a capacitance technique to determine
the position of the infiltration front as a function of time during th
e pressure infiltration of ceramic particulate preforms with liquid me
tals. In the present work, the technique was extended to higher temper
atures and was used to monitor the infiltration of alumina particulate
preforms with Al-Mg alloys and silicon carbide particulate preforms w
ith Sn and an Al-Si alloy. The infiltration front position could be de
termined in the alumina preforms. However, it was not possible to clea
rly interpret the results obtained from the infiltration of semiconduc
ting silicon carbide preforms. The observed range of capacitance circu
it voltage to infiltration distance ratios agreed with the predicted r
ange for both simulated and alumina preform infiltration experiments.
Formation of unstable infiltration fronts could also be detected.