| abstract |
FIELD: chemistry. n SUBSTANCE: mixture of hydrargillite with 1÷15 wt % of electrocorundum with a grain size of 10-50 mcm is filled with 0.5÷2 wt % of aqueous hydrochloric acid and stirred to form a composition of a homogeneous dispersed phase, the composition is placed in an autoclave in which hydrothermal treatment is carried out at a temperature of 180÷220°C for 4÷26 hours, the resulting mixture of formed and electrocorundum is first heated in a muffle furnace in air at a temperature of no higher than 1200°C until the moisture is completely removed, then transferred to a vacuum oven, heated and maintained at a temperature of 1700 to 1800°C for 1÷2 hours, the resulting ceramic is then cooled to form a precursor. n EFFECT: invention makes it possible to produce a ceramic precursor with a high density, which makes it possible in the future to synthesise a qualitative leucosapphire with a low content of mineral impurities. n 5 ex |