Preparation method of forsterite-based foamed ceramic spherical shell for civil air defense engineering

Abstract

The invention relates to a preparation method of a forsterite-based foamed ceramic spherical shell for civil air defense engineering. According to the technical scheme, the preparation method comprises the following steps: uniformly mixing 67-85 wt% of forsterite powder, 5-10 wt% of sericite powder, 3-13 wt% of silicon micro-powder, 10-15 wt% of a binding agent, 10-30 wt% of water and 8-15 wt% ofa pore-forming agent to obtain a mud material; filling a hemispherical shell mold with an outer diameter of 6-10 cm and an inner diameter of 3-5 cm with the mud material, pressing into a hemisphericalshell billet under 5-10 Mpa, butting and combining the edge openings of the hemispherical shells into a hollow sphere under the same pressure, and demolding; and curing at 25 DEG C for 2-5 hours, then drying at 60-110 DEG C for 6-12 hours, then putting in an air atmosphere, heating to 800-1000 DEG C at a speed of 1-10 DEG C/min, keeping the temperature for 1-2 hours, and sintering and sealing toobtain the forsterite-based foamed ceramic spherical shell. According to the invention, the raw materials used in the method are cheap and easy to obtain, the sintering temperature is low, the production efficiency is high, and automatic production can be achieved; and the forsterite-based foamed ceramic spherical shell prepared through the method is uniform in wall thickness, high in strength andcontrollable in density, wall thickness and sphere size.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic spherical shells. In particular, it relates to a method for preparing a forsterite-based foam ceramic spherical shell used in civil air defense projects. Background technique [0002] The foamed ceramic spherical shell has the dual characteristics of efficient clipping and energy absorption of porous materials and high structural strength of the shell. It not only has a strong attenuation effect on the explosion wave, but also has the ability to withstand multiple blows. The diffraction and isolation effects of force waves enhance the dispersion and attenuation effects of materials on waves while maintaining strength, so they have broad application space in the fields of impact dynamics and civil air defense engineering. [0003] Cao Yan et al. (Zeng Yan, Sang Yuanhua, Liao Qilong, etc. prepared millimeter-scale translucent Al 2 o 3 Hollow ball [J]. Journal of Chinese Ceramic Society, 201...

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Problems solved by technology

[0005] The parameter index corresponding to the national standard (GB / T 3994-2013) of the clay insulation refractory brick, which is also a foam ceramic material, shows that when the bulk density of the material is 0.8 g / cm 3 When the normal temperature static strength is 2.5MPa, there is a contradiction between the low density and high strength of the foamed ceramic material, which cannot meet the low density and high strength technical requirements of the foamed ceramic spherical shell of the civil air defense project.

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