| Description |
xi, 73 leaves : illustrations ; 29 cm |
| Summary |
"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, leaf ii. |
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