Scientific basis of technology of fine-crystalline quartz and corundum

Danchevskaya, M.N.; Ivakin, Y.D.; Torbin, S.N.; Panassyuk, G.P.; Belan, V.N.; Voroshilov, I.L.

Авторы: Danchevskaya M.N., Ivakin Yu D., Torbin S.N., Panassyuk G.P., Belan V.N., Voroshilov I.L.
Журнал: High Pressure Research
Том: 20
Год издания: 2001
Издательство: Taylor & Francis
Местоположение издательства: United Kingdom
Первая страница: 229
Последняя страница: 239
DOI: 10.1080/08957950108206170
Аннотация: Authors have investigated the mechanism and the kinetics of fine-crystalline quartz and corundum synthesis in supercritical water. The thermovaporous treatment of raw materials has been carried out in laboratory (v = 20 d) and technical (v = 2 m3 and v = 4 m3) autoclaves at temperatures between 390 and 410°C and vapor pressures of water from 20 to 27 MPa in the presence of microadditives of activators. The samples of products after thermovaporous treatment have been studied by X-ray diffraction, optical and electron microscopy, mass-spectroscopy, ESR-, IR-spectroscopy, thermal analysis and pycnometry. It was shown that microadditives of activator into silica or alumina might not only accelerate the attainment of the best hydroxylation, but also initiate the transformation of precursors in an ordered way. The control of the transformation mechanism by introducing activators into the starting materials has allowed us to obtain fine-crystalline quartz and corundum with desired properties: various habitues and size of crystals. On the basis of these data, technology of fine-crystalline quartz and corundum has been developed.
Добавил в систему: Данчевская Марина Николаевна

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