| 摘要 |
Glass batch compositions for producing low to medium expansion glasses having linear coefficients of thermal expansion in the range of from about 4.1 x 10<->7 to about 19.0 x 10<->7 in./in./ DEG C. over a temperature range from 0 DEG -300 DEG .C. The glass batch compositions are capable of being melted at a temperature of about 1600 DEG C. and are composed essentially of a finely divided admixture of 70-87 mole percent SiO2 and 1.0-10 mole percent AlPO4 together with 0-21 mole percent of at least one RO2 oxide selected from the group consisting of from 0-14 mole percent TiO2 and 0-10 mole percent GeO2. The total mole percent of SiO2 and AlPO4 preferably constitute at least 79 mole percent of the total glass batch composition.
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