1 College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004; 2 Guangxi Fenglin Wood Industry Group Co.Ltd., Nanning 530031; 3 Dare Wood-based Panel Group Co.Ltd., Zhenjiang 212300
Abstract: Magnesium inorganic foam materials with a large number of closed pores were prepared by chemical foaming process using magnesium cementitious materials as matrix and hydrogen peroxide as foaming agent. The effects of addictive amount of hydrogen peroxide on the foaming ratio, bulk density, compressive strength, bending strength, pore structure parameters and thermal conductivity of foam materials were studied. The results demonstrated that the addition of hydrogen peroxide increased, the bubble nuclei in the slurry increased, and the internal force of the bubble growth increased, which made the pore diameter become larger and the bulk density and mechanical strength reduced. Furthermore, the thermal conductivity decreased, and then increased when the addictive amount of hydrogen peroxide was lager than 16‰. Regression equations of the compressive strength, flexural strength with bulk density of the magnesium inorganic foam materials are y=-6.06+24.19x, y=-0.64+3.82x, respectively, which are closely linear correlations. When the addictive amount of hydrogen peroxide was 8‰, the maximum mechanical strength was obtained. At this time, the pore diameter was the smallest, the pore structure parameter was better, the thermal conductivity was 0.071 W/(m·K) and the bulk density was only 0.54 g/cm3.
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