Abstract Low–cost Al2O3-SiO2-CaO ceramic foams were prepared using a novel and simple reactive foaming process. The foamed green bodies were produced by mixing aluminium powder and calcium hydroxide in an aqueous solution of sodium silicate and sintered in an argon atmosphere using a pressureless electric current assisted process (T = 800 °C). An additional thermal treatment was performed in air using a conventional furnace (T = 1050 °C) in order to oxidize the residual metallic phases. The resulting foams exhibited open porosity, densities ranging from 0.50 to 0.65 g/cm3 and wide pore size distribution (0.04–400 µm). The compressive strength and thermal diffusivity of these foams ranged from 2.12 to 1.01 MPa and from 0.27 to 0.45 mm2s−1, respectively, which indicate their suitability as thermal insulator materials.

中文翻译：

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新型环保型Al 2 O 3 /SiO 2 /CaO泡沫陶瓷的制备与表征

摘要 采用一种新颖且简单的反应发泡工艺制备了低成本的 Al2O3-SiO2-CaO 陶瓷泡沫。通过将铝粉和氢氧化钙混合在硅酸钠水溶液中并使用无压电流辅助工艺（T = 800°C）在氩气气氛中烧结来生产泡沫生坯。使用传统的炉子 (T = 1050 °C) 在空气中进行额外的热处理，以氧化残留的金属相。所得泡沫表现出开孔、密度范围为 0.50 至 0.65 g/cm3 和宽孔径分布 (0.04–400 µm)。这些泡沫的压缩强度和热扩散率分别为 2.12 至 1.01 MPa 和 0.27 至 0.45 mm2s-1，表明它们适合作为绝热材料。