Preparation and Properties of Ultralight Glass Foams from Hollow Microspheres
QU Yanan1,*, XIE Yongjiang1, ZHONG Xinhua1, YANG Jinlong2
1 Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China 2 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Abstract: A new preparation method of ultralight glass foams from hollow microspheres was investigated in this work. High-porosity hollow microspheres were prepared using waste glass powder as the main raw material, and the foaming process and foaming mechanism of the hollow microspheres were investigated. The ultralight glass foams were successfully prepared by the hollow microspheres foaming method. The results show that the hollow microspheres with high porosity and controllable foaming process can be used to prepare glass foams with uniform pore size and high porosity. With the decreasing of the glass powder particle size, the volume expansion ratio of the hollow microspheres gradually increases. The maximum volume expansion ratio of the hollow microspheres is about 280% when the D50 of the glass powder is 4.3 μm. With the increasing of the sintering temperature, the bulk density of the glass foams decrease, the porosity and the crystal percentage of the glass foams increase. The main crystalline phases are quartz(SiO2), tridymite(SiO2) and devitrite (Na2Ca3Si6O16). The ultralight glass foams with porosity greater than 95% are prepared at the sintering temperature of 725～800 ℃. The hollow microspheres foaming method presented in this work is widely applicable to the preparation of inorganic porous materials.
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2024, Vol. 38 
