Study on thermogravimetric, flammability properties and micromorphology of buried wood

The flammability of wood has always been an unavoidable problem. The thermal decomposition properties and flammability properties of buried wood (BW) were studied in this paper. It can be found that in the weight loss rate of dehydration and passive pyrolysis stage were significantly increased, while the weight loss rate in the second stage of pyrolysis was significantly reduced. The activation energy of BW increased by 23.621 kJ/mole, oxygen index by 2.34%, and the combustion rate and combustion length of horizontal combustion decreased by 0.7 s mm−1 and 7.7 mm respectively. The information provided by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) indicated that some calcium, iron and other metal elements were deposited in the cell walls and fiber ducts of wood. This is a potential method for wood modification without pollution.