The effect of alkali-containing additive of water soluble lump silicate on the degree of cristobalitization and thermal expansion of specimens based on fuzed quartz HCBS is studied. The additive content (for Na20) is varied within the limits of 0.1 – 2.0% or from 0.025 to 0.50%. In specimens given prior nonisothermal heating to 1500°C the cristobalite content is from 32 – 34% (specimens without additive) to 88 and 96% (specimens with 1 and 2% additive). Specimen maximum thermal expansion corresponding to transition of low-temperature into high-temperature cristobalite occurs within a limited range of 150 – 300°C.
Refractories and Industrial Ceramics – Springer Journals
Published: Aug 6, 2016
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