TY - JOUR
T1 - Effects of air leaks on the phase content, microstructure, and interfacial behavior of CVD zirconia on SiC fiber
AU - Li, Hao
AU - Lee, Jinil
AU - Lee, Woo Young
PY - 2002
Y1 - 2002
N2 - A slight increase in the rate of air leaks into the CVD-ZrO2 process appeared to mitigate the nucleation of tetragonal ZrO2 phase. Without the nucleation of the tetragonal phase, the ZrO2 layer was well bonded to the SiC fiber surface and exhibited no delamination at the fiber/coating interface region. This strong bonding at the fiber/coating interface could significantly decrease, depending on the ZrO2 coating thickness, the tensile failure load of the coated SiC fiber tows. In contrast, ZrO2 coating specimens, produced at the lower air leak rates, contained the tetragonal ZrO2 phase. For these specimens, delamination occurred within the ZrO2 coating, and the coating did not decrease the fiber tow failure load. These results suggest that such a small change in the air leak rate could significantly change the nucleation behavior of ZrO2 and consequently its interfacial properties as a fiber coating for SiC/SiC composites.
AB - A slight increase in the rate of air leaks into the CVD-ZrO2 process appeared to mitigate the nucleation of tetragonal ZrO2 phase. Without the nucleation of the tetragonal phase, the ZrO2 layer was well bonded to the SiC fiber surface and exhibited no delamination at the fiber/coating interface region. This strong bonding at the fiber/coating interface could significantly decrease, depending on the ZrO2 coating thickness, the tensile failure load of the coated SiC fiber tows. In contrast, ZrO2 coating specimens, produced at the lower air leak rates, contained the tetragonal ZrO2 phase. For these specimens, delamination occurred within the ZrO2 coating, and the coating did not decrease the fiber tow failure load. These results suggest that such a small change in the air leak rate could significantly change the nucleation behavior of ZrO2 and consequently its interfacial properties as a fiber coating for SiC/SiC composites.
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M3 - Conference article
AN - SCOPUS:0036458811
SN - 0196-6219
VL - 23
SP - 261
EP - 268
JO - Ceramic Engineering and Science Proceedings
JF - Ceramic Engineering and Science Proceedings
IS - 3
T2 - 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A
Y2 - 13 January 2002 through 18 January 2002
ER -