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, Activation analysis, Activation energy, Boric acid, Differential scanning calorimetry, Mixtures, Scanning electron microscopy, Thermoanalysis, Thermogravimetric analysis, X ray diffraction, Hexagonal plates, Kinetic analysis, Stoichiometric mixtures, Synthesis reaction, Temperature intervals, Temperature range, 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 tempeПоказать полностьюrature 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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Выпуск журнала: Vol. 52, Is. 6

Номера страниц: 550-557

ISSN журнала: 00201685

Место издания: NEW YORK



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