Phase Transformations in Dicalcium Silicate: I, Fabrication and Phase Stability of Fine‐Grained β Phase
作者:
Ian Nettleship,
Kurt G. Slavick,
Youn Joong Kim,
Waltraud M. Kriven,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 9
页码: 2400-2406
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05592.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Fine‐grained β‐Ca2SiO4containing small amounts of sodium was fabricated as an analogue to tetragonal zirconia polycrystals (TZP) in order to study the stress‐induced β→γ transformation. This avoided the problems associated with the fabrication and evaluation of composites containing β‐Ca2SiO4. The microstructure of dense β‐Ca2SiO4exhibited severe intergranular strains and twin‐terminating microcracks as seen by TEM. The β‐phase twin widths were quantitatively correlated with grain sizes giving an average ratio of 0.04. Stress‐induced transformation was observed on ground surfaces but not on fracture surfaces. The stress–strain behavior and the mechanical properties were consistent with stress‐induced microcracking and microcrack coalescence. The elastic modulus of fully dense β phase
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