"Glass-ceramics have demonstrated the potential to serve as composite matrices due primarily to their low moduli of elasticity, and relative ease of densification. Novel candidates for a glass-ceramic composite matrix, developed initially for radiological applications, lie in the yttria-alumino-silicate system. The specific composition chosen for a composite matrix in weight percent was 40Y2O3*30Al2O3*30SiO2, termed YAS-7. This composition exhibited polymorphic phase changes during initial investigation as a composite matrix. The crystalline products of YAS-7 were found to be mullite and alpha-Y2Si2O7 or mullite and beta-Y2Si2O7. A series of heat treatments was conducted to better understand the characteristics related to the presence of each polymorphic phase and to investigate the relationships between them. Optical microscopy and x-ray diffraction were used to characterize the results of the various heat treatments"--Abstract, page ii.
Moore, Robert E., 1930-2003
Day, D. E.
Dharani, Lokeswarappa R.
Materials Science and Engineering
M.S. in Ceramic Engineering
McDonnell Douglas Aircraft Company
University of Missouri--Rolla
xi, 73 pages
© 1989 Michael Craig Long, All rights reserved.
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Long, Michael Craig, "Polymorphism of Y₂Si₂O₇ in an yttria alumino silicate glass ceramic" (1989). Masters Theses. 741.
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