Abstract
The effect of gallium oxide on cristobalite formation in binary borosilicate glass composite, containing a low‐softening borosilicate glass (BSG) and a high‐softening high‐silica glass (HSG), has been studied. X‐ray diffraction results show that with a small amount of gallium oxide, 2.5–10 vol%, the precipitation of cristobalite at elevated temperatures is prevented. This result is further evidenced by linear thermal expansion measurement, in which, in contrast to the gallium oxide‐free sample, the thermal expansion coefficients (TCE) of the composite with gallium oxide remain unchanged with sintering time at temperatures investigated and, moreover, are very close to the theoretically calculated values.
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