کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8011849 1516930 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermal decomposition kinetics of Algerian Tamazarte kaolinite by thermogravimetric analysis
ترجمه فارسی عنوان
سینتیک تجزیه حرارتی از کائولینیت الجزایر طامازارت با استفاده از آنالیز ترموگرافیمتری
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
The decomposition kinetics of Algerian Tamazarte kaolinite (TK) was investigated using thermogravimetric analysis (TG). Differential thermal analysis (DTA) and TG experiments were carried out between room temperature and 1400 °C, at different heating rates from 10 to 40 °C/min. The activation energies, measured by DTG from isothermal treatments using Johnson-Mehl-Avrami (JMA) and Ligero methods and by non-isothermal treatments using Ozawa, Boswell and Kissinger methods, were around 151 and 144 kJ/mol, respectively. The Avrami parameter of growth morphology (indicating the crystallization mode) was found to be around 1.57 using non-isothermal treatments; however, when using isothermal treatments it is found to be equal to 1.35. The numerical factor, which depends on the dimensionality of crystal growth, is found to be 1.53 using Matusita equation. The frequency factor calculated by the isothermal treatment is equal to 1.55×107 s−1. The results show that the bulk nucleation is followed by three-dimensional growth of metakaolinite with polyhedron-like morphology controlled by diffusion from a constant number of nuclei.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 27, Issue 8, August 2017, Pages 1849-1855
نویسندگان
, , , , ,