"Comparative Performance of Three Magnesium Compounds on Thermal Degrad" by Yiqiang Wu, Chunhua Yao et al.

Faculty Publications

Title

Comparative Performance of Three Magnesium Compounds on Thermal Degradation Behavior of Red Gum Wood

Authors

Yiqiang Wu, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China. yiqiangwu@csuft.edu.cn.
Chunhua Yao, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China. chunhuayao8@gmail.com.
Yunchu Hu, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China. hucsfu@163.com.
Xiaodan Zhu, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China. zhuxd0610@126.com.
Yan Qing, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China. qingyan0429@163.com.
Qinglin Wu, School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA. wuqing@lsu.edu.

Document Type

Article

Publication Date

1-24-2014

Abstract

The effect of basic magnesium carbonate (BMC), magnesium hydroxide (MH), and magnesium chloride hydrate (MCH) on thermal degradation of red gum wood was studied using cone calorimetry, Thermogravimetric-differential scanning calorimetry (TG-DSC) analysis, and X-ray diffraction (XRD) characterization. The results showed common fire retardation actions of the three compounds by releasing incombustible gas and/or water vapor to dilute combustible gas in the flaming zone, and by converting to MgO, which had a satisfactory protective wall effect on the wood. Individually, BMC absorbed heat from the wood at the pre-decomposition stage and, thus, slowed down wood pyrolysis process. It slightly increased the char yield by charring in both the charring stage and the char calcination stage. MH lost water at about 270 °C, close to the temperature at which wood thermally degraded. MH rendered wood char quickly, and the compact char layer impeded further carbonization and burning of inner wood. MCH promoted charring with Mg as a Lewis acid, and increased wood char yield. MCH also released Cl· free radical and HCl at 167 °C, which easily coordinated with combustion reaction radical, and slowed down, even inhibited, the combustion chain reaction.

Publication Source (Journal or Book title)

Materials (Basel, Switzerland)

First Page

637

Last Page

652

Recommended Citation

Wu, Y., Yao, C., Hu, Y., Zhu, X., Qing, Y., & Wu, Q. (2014). Comparative Performance of Three Magnesium Compounds on Thermal Degradation Behavior of Red Gum Wood. Materials (Basel, Switzerland), 7 (2), 637-652. https://doi.org/10.3390/ma7020637

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