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Foaming mechanisms of different foaming agents and their effects on the microstructures of porous magnesia ceramics

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Abstract

The foaming and foam stabilization mechanisms of potassium laurate (PL), potassium oleate (PO), sodium dodecyl sulfate (SDS), and sodium dodecylbenzenesulfonate (SDBS) were investigated in this study. Magnesia porous ceramics were fabricated by a foaming method, and the sample microstructures were analyzed by scanning electron microscopy (SEM) following heat treatment. Results showed that the foaming ability of the surfactants decreased in the order PO > SDS > SDBS > PL. The addition of calcium stearate (CS), a foam-stabilizing agent, extended the half-lives of SDS, SDBS, and PO foams in the order SDBS > PO > SDS. However, the addition of CS to PL significantly decreased its foam half-life. Pore sizes of the heat-treated samples decreased in the order PL > SDS > SDBS > PO, while the evenness of the pore distribution decreased in the order PO > SDBS > SDS > PL. Porous ceramics prepared with PO and CS had the smallest and most evenly distributed pores in the range of 5–10 μm.

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Funding

This study was funded by the National Key R&D Program of China (2017YFB0310701).

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Authors and Affiliations

  1. College of High-Temperature Materials and Magnesium Resource Engineering, University of Science and Technology Liaoning, 185 Qianshan Middle Road, Anshan, 114051, China

    Jishuo Han, Guohua Li, Huinan Gao, Shujiang Chen & Lin Tian

  2. Ruitai Materials Technology Co., Ltd., China Building Materials Academy, Beijing, 100024, China

    Lin Yuan

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  1. Jishuo Han
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  2. Guohua Li
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Correspondence to Guohua Li.

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Han, J., Li, G., Gao, H. et al. Foaming mechanisms of different foaming agents and their effects on the microstructures of porous magnesia ceramics. J Aust Ceram Soc 56, 1005–1011 (2020). https://doi.org/10.1007/s41779-019-00443-2

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