Open AccessAnalysis of Thermochemical Properties of three typical Manganese based thermite
Author(s) -
Rui Zhu,
Tao Guo,
Miao Yao,
Xiaofeng Liu,
Qiong Wang,
Deliang Wen
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/446/2/022024
Subject(s) - thermite , gibbs free energy , manganese , thermodynamics , enthalpy , standard enthalpy of formation , materials science , standard enthalpy of reaction , reaction rate , chemistry , standard enthalpy change of formation , metallurgy , aluminium , organic chemistry , physics , catalysis
In order to investigate the thermochemical and reactive properties of thermite composed of typical manganese oxides, three common manganese oxides meaning MnO 2 , Mn 2 O 3 and Mn 3 O 4 , are selected in this paper to form aluminothermic agent with Al powder, respectively. According to the chemical thermodynamics, the difference of Gibbs free energy among different components is calculated, and the reaction rate k is calculated according to Eyring equation, then the Gibbs free energy values of three thermite at different ambient temperatures are drawn. Furthermore, according to the theory of chemical reaction calorific value calculation, the reaction calorific values of three thermite at different temperatures are calculated. The results show that the Gibbs free energy of Al/MnO 2 system is the smallest at different temperatures, the reaction rate and the enthalpy of reaction of Al/MnO 2 are the fastest and the smallest at different temperatures and the heat release is the largest. The results of calculation provide theoretical guidance for experimental design and practice. Under the condition of the same mass of reactants, the discharge heat of MnO 2 is the largest, and the heat value of the MnO 2 is the highest.