Low expansion aluminosilicate glass compositions comprising a pentavalent metal oxide
Abstract
Abstract LOW THERMAL EXPANSION GLASS COMPOSITIONS BASED ON A TERNARY GLASS SYSTEM COMPRISING SIO2-AL2O3-R2O5, WHERE R IS A PENTAVALENT METAL, SUCH AS VANADIUM, NIOBIUM AND TANTALUM, HAVING AN ATOMIC RADIUS OF ABOUT 10.4 TO 1.46 A. AND AN IONIC RADIUS OF ABOUT 0.59 TO 0.73 A., OR MIXTURES THEREOF. EQUIMOLAR SUBSTITUTION OF SIO2 IN THE ABOVE TENERY SYSTEM WITH A STABILIZER COMPOUND, SUCH AS B2O3 OR ALPO4, HAS BEEN FOUND TO ENHANCE THE RESISTANCE OF THE GLASSES OF THIS INVENTION TO PHASE SEPARATION. THE LOW TERMAL EXPANSION GLASSES OF THIS INVENTION CAN BE READILY FORMED AT TEMPERATURES BELOW 1700*C. USING CONVENTIONAL TECHNIQUES, AND ARE USEFUL IN THE PREPARATION OF THERMAL SHOCK-RESISTANT GLASSWARE AND LOW EXPANSION REFLECTIVE MIRROR BLANKS.
Inventors
- 👤 C Rapp
Bibliographic Details
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