TY - GEN
T1 - Transformation toughening of a calcium zirconate matrix by dicalcium silicate, under ballistic impact
AU - Kriven, W. M.
AU - Rosczyk, B. R.
AU - Kremeyer, K.
AU - Song, B.
AU - Chen, W.
PY - 2003
Y1 - 2003
N2 - Preliminary investigations have been made on toughening ceramic armor materials by inducing large volume change phase transformations in ceramics. Such transformations cannot be induced by a normal, slow crack growth mechanism such as occurs in zirconia, but requires an exceedingly high activation energy barrier to be overcome. We have developed a procedure for evaluating mechanical behavior under both quasi-static and dynamic loading conditions. The failure modes under quasi-static loading conditions were observed to be non- catastrophic. Preliminary results suggest that dicalcium silicate (Ca2SiO4) dispersed in a calcium zirconate (CaZrO3) matrix material increases the toughness of the material. It is thought that the energy of ballistic impact is able to overcome the prohibitively, high activation energy barrier to nucleate the orthorhombic to monoclinic transformation in Ca2SiO4 which is accompanied by an ∼12% volume increase at 490°C.
AB - Preliminary investigations have been made on toughening ceramic armor materials by inducing large volume change phase transformations in ceramics. Such transformations cannot be induced by a normal, slow crack growth mechanism such as occurs in zirconia, but requires an exceedingly high activation energy barrier to be overcome. We have developed a procedure for evaluating mechanical behavior under both quasi-static and dynamic loading conditions. The failure modes under quasi-static loading conditions were observed to be non- catastrophic. Preliminary results suggest that dicalcium silicate (Ca2SiO4) dispersed in a calcium zirconate (CaZrO3) matrix material increases the toughness of the material. It is thought that the energy of ballistic impact is able to overcome the prohibitively, high activation energy barrier to nucleate the orthorhombic to monoclinic transformation in Ca2SiO4 which is accompanied by an ∼12% volume increase at 490°C.
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U2 - 10.1002/9780470294802.ch56
DO - 10.1002/9780470294802.ch56
M3 - Conference contribution
AN - SCOPUS:0345328783
SN - 9781119040439
T3 - Ceramic Engineering and Science Proceedings
SP - 383
EP - 388
BT - Ceramic Engineering and Science Proceedings
PB - American Ceramic Society
T2 - Ceramic Engineering And Science Proceedings: 27th International Cocoa Beach Conference on Advanced Ceramics and Composites:A
Y2 - 26 January 2003 through 31 January 2003
ER -