| 摘要 |
This is for composition of low thermal expansive-machinible glass-ceramic. The compositions comprises 5-18 wt.% of K2O, 2-8 wt.% of Li2O, 2-9 wt.% of TiO2, 9-23 wt.% of Al2O3, 50-70 wt.% of SiO2, and 4-10 wt.% of F (or pref. 5-10 wt.% of K2O, 5-8 wt.% of Li2, 2-5 wt.% of TiO2, 13-25 wt.% of Al2O3, 50-70 wt.% of SiO2, and 4-10 wt.% of F). A weighted mixture is melted for 1-4 hr at 1300-1450 deg.C and forming glass in preheated mold, and the crystallized glass is made by heat treatment at 800-1050 deg.C for 1-8 hr..
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