Abstract
The use of the pyrophyllite mineral in the production of ceramics and refractories is determined by a number of valuable technological properties: good machinability, high chemical resistance, low content of alkali metal oxides and coloring oxides, use as a thinning additive, etc. The results of a study of physico-chemical processes occurring when heating compositions based on pyrophyllite-containing raw materials by various instrumental methods are presented. The temperatures of dehydration of diaspore, sericite and kaolinite, the formation of mullite from kaolinite and the transition of γ→α-aluminum oxide are determined. The temperatures of the beginning of deformation of ceramic compositions based on pyrophyllite-containing raw materials were determined when the samples were heated to 750°C and 1300°C. The coefficient of expansion of a ceramic material based on pyrophyllite-containing raw materials is calculated. As a result, an annealing-free technology of thin-walled reinforced tubular products using a phosphate binder was created.
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