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Journal of the Korean Ceramic Society 1994;31(12): 1552. |
| 금운모계 결정화유리에 관한 연구 |
| 박용완, 원종원, 임명호 |
| 한양대학교 무기재료공학과 |
| A Study on the Glass-Ceramics of the Eluorphlogopite System |
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| ABSTRACT |
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Glasses in K2O-Na2O-MgO-Al2O3-SiO2-F system were crystallized to prepare machinable glass-ceramics. The optimum nucleating and crystal growing temperatures were approximately $700^{circ}C$ and 1060~112$0^{circ}C$, respectively for the samples investigated. Crystalline phases of sellaite, norbergite, and fluorphlogopite appeared progressively as heat-treatment temperature was increased. Surface roughness of the crystallized specimens after the machining was similar to that of metal aluminum (2.18 ${mu}{textrm}{m}$). Thermal expansion coefficient, Vickers hardness and dielectric constants of the fluorphlogopite glass-ceramics prepared were 7.37~10.21 ($times$10-6/$^{circ}C$), 302~456kgf/$textrm{mm}^2$ and 5.97~16 respectively. |
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