| 摘要 |
<p>A method for producing an ultra-low expansion glass, comprising: preparing a TiO2-SiO2 glass ingot having a desired TiO2 concentration; cutting out a sample from the TiO2-SiO2 glass ingot; measuring the OH concentration C(OH), TiO2 concentration C(TiO2) and fictive temperature (TF); calculating the zero-CTE temperature (T) based on the C(OH), C(TiO2) and (TF) having been measured above; examining whether or not the difference (?T) between the zero-CTE temperature (T) and the target value falls within a preset range; and, in the case where (?T) is inside of the range, referring the TiO2-SiO2 glass ingot as having the desired zero-CTE temperature, or, in the case where (?T) is not inside of the range, modifying the conditions for producing the TiO2-SiO2 glass ingot based on the difference (?T).</p> |
