Question

Crucibles are made of mixture of quartz and silica since the linear coefficient of expansion is

• A. Zero for that mixture
• B. Infinity for that mixture
• C. Negative for that mixture
• D. Positive for that mixture

Answer 1

Answer: (A)

Zero for that mixture

Its thermal expansion is practically zero. Bricks of this type are used in the melter crown of the glass furnace as they provide good resistance to creep and good mechanical strength at the operating temperature.