The initial stages of sintering and mullite formation are studied for specimens based on HCBS of complex composition prepared by combined wet milling of high-alumina bauxite and fuzed quartz. The starting materials have a different ratio of components and solid phase particle fineness. The initial sintering stage is in the range 900 – 950°C, and mullite formation 1100 – 1150°C. In the range 1150 – 1200°C there are simultaneously both sintering and mullite formation. Depending on fineness and fuzed quartz HCBS content the maximum amount of shrinkage is 0.35 – 0.60%. An increase in firing temperature to above 1200°C is accompanied by specimen growth and an increase in porosity. Even with an insignificant level of the proportion of sintering pores (0.09 – 0.11) materials have an ultimate strength in bending of 100 – 130 MPa and open porosity of 14 – 16%.
Refractories and Industrial Ceramics – Springer Journals
Published: Feb 22, 2016
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