Carbothermal synthesis of TiB2 powders of micron size

Тип публикации: статья из журнала

Год издания: 2016

Идентификатор DOI: 10.1134/S0020168516060017

Ключевые слова: titanium diboride, powders, carbothermal synthesis, thermal analysis, carbothermal synthesis, powders, thermal analysis, titanium diboride, Activation analysis, Activation energy, Boric acid, Differential scanning calorimetry, Mixtures, Powders, Scanning electron microscopy, Thermoanalysis, Thermogravimetric analysis, X ray diffraction, Carbothermal synthesis, Hexagonal plates, Kinetic analysis, Stoichiometric mixtures, Synthesis reaction, Temperature intervals, Temperature range, Titanium diboride, X ray powder diffraction

Аннотация: The characteristic details of the carbothermal synthesis of TiB2 powders from the stoichiometric mixture TiO2-H3BO3-C at temperatures lower 1700 K are investigated using thermal analysis (D cent G-thermogravimetry and DSC-differential scanning calorimetry), as well as X-ray diffraction and scanning electron microscopy. In the temperature interval 300 K -> 1673 K -> 1273 K and at a heating rate of 10 K/min, the reaction in the powder mixture begins at approximately 1300 K and ends at 1470 K during cooling. After 3 h of isothermal synthesis at 1473 K, the TiB2 yield is more than 90%. The resulting products are hexagonal plate-like crystals 5-10 mu m across with thickness of 3 to 4 mu m. Kinetic analysis showed that in the temperature range of 1330 to 1673 K the TiB2 synthesis reaction is of the first-order, and the calculated activation energy of the process is 315 +/- 24 kJ/mol.

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Издание

Журнал: INORGANIC MATERIALS

Выпуск журнала: Vol. 52, Is. 6

Номера страниц: 550-557

ISSN журнала: 00201685

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

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