| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass material that has a heat distortion temperature where reheat press forming in the glassy state is available and, has a thermal expansion coefficient of the crystallized glass by heat treatment of 5×10-7 l/ deg.C. SOLUTION: The SiO2-Al2O3-Li2O-based glass has the basic compositions which are SiO2 of 60-63 wt.%, 23-25 wt.% and 4-5 wt.%, and the modifying components which contain ZrO2 of 1.5-2.5 wt.%, TiO2 of 0.5-2.5 wt.%, MgO of 0.5-1.5 wt.%, ZnO of 0.5-1.2 wt.%, Na2O of 0.5-2.0 wt.%, K2O of 0.5-2.0 wt.% and one of the following components: BaO of 0.5-1.0 wt.%, CaO of 1.0-2.0 wt.% and B2O3 of 0.01-1.0 wt.%. The above components provide the crystallized glass material with low thermal expansion.
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