| 摘要 |
PROBLEM TO BE SOLVED: To carry out the redraw forming after crystallization by providing a crystallizable glass with properties of affording a crystallized glass having a specific value or below of deposited crystal grain diameter, a specific range of the ratio of the glass phase and a lower softening point of the main crystal than the melting point. SOLUTION: The deposited crystal grain diameter is <=10μm and the ratio of the glass phase is 10-85 vol.%. When the softening point is lower than the melting point, the redraw forming can be carried out at a lower temperature than the melting point. Since the crystal remains after forming, the forming can be carried out while substantially maintaining characteristics as a crystallized glass. The deposited cryatal or glass composition is not especially limited when the crystallized glass having the characteristics is obtained. The kind of the deposited crystal is selected according to the purpose and use and the compositional system of the glass is determined according to the kind of the glass. For example, when the crystallized glass of low expansion is desired, an Li2O-Al2O3-SiO2-based crystallizable glass having properties of depositing aβ-quartz solid solution or aβ-spodumene solid solution as a main crystal is suitable.
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