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Effect of Carbon Dioxide on the Reactivity of the Oxidation of Boron Particles
Author(s) -
Li Heping,
Ao Wen,
Wang Yang,
Zhou Hua,
Liu Jianzhong,
Zhou Junhu
Publication year - 2014
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201300180
Subject(s) - boron , combustion , boron oxide , carbon dioxide , activation energy , thermogravimetric analysis , reactivity (psychology) , chemistry , atmosphere (unit) , diffusion , oxygen , weight change , carbon fibers , chemical engineering , inorganic chemistry , materials science , analytical chemistry (journal) , environmental chemistry , organic chemistry , composite number , thermodynamics , weight loss , medicine , physics , alternative medicine , pathology , engineering , composite material , obesity
Carbon dioxide produced in the primary combustion of propellants apparently affects the combustion of boron. In this study, the thermodynamic and kinetic properties of the combustion of boron particles in a CO 2 environment (solely or as a mixture with other gases) were investigated using thermogravimetric analyses. For the combustion of boron in an atmosphere containing 10 % oxygen, in addition to a large initial weight gain, a second increase in weight was observed when the temperature reached 1150 °C. However, when the combustion was carried out in pure CO 2 atmosphere, the sample lost weight at temperatures above 1300 °C. The above results indicated that the layer of boron oxide covering the boron particles had a significant effect on the combustion process. With a limiting concentration of O 2 (10 %), the initial temperature and effective activation energy slightly decreased as the content of CO 2 increased from 0 to 30 %. However, a further increase in the CO 2 content (50 %) increased the effective activation energy, indicating the inhibitory effects of CO 2 at higher concentrations. Furthermore, the weight and the rate of weight gain gradually increased with increasing CO 2 content. This behavior was attributed to the improvement in the diffusion of the oxidant. This study conclusively revealed that the inclusion of an optimal level of CO 2 in a reaction environment containing O 2 facilitated the combustion of boron particles.