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

Abstract

The invention relates to a preparation method of an alumina-based foamed ceramic spherical shell for civil air defense engineering. The preparation method comprises the following steps: preparing a pug by taking 67-80 wt% of alumina powder, 15-18 wt% of Guangxi white mud and 5-13 wt% of kaolin as raw materials, adding 10-15 wt% of a binder, 10-40 wt% of water and 40-80 wt% of a pore-forming agentand performing uniform mixing; filling the pug into a hemispherical shell mold with the outer diameter of 8-12 cm and the inner diameter of 4-6 cm, pressing the pug into a hemispherical shell green body under the pressure of 1-4 Mpa, butting and combining the side openings of hemispherical shells into a hollow sphere under the same pressure to form a hollow sphere, and demolding the hollow sphere;firstly curing the hollow sphere for 2-5 h at 25 DEG C, then drying the hollow sphere for 6-12 h at 60-110 DEG C, then putting the hollow sphere in an air atmosphere, heating the hollow sphere to 1100-1300 DEG C at a speed of 1-5 DEG C / min, keeping the temperature for 1-2 h, and performing sintering and sealing to obtain the alumina-based foamed ceramic spherical shell. The raw materials used inthe invention are cheap and easy to obtain, the production efficiency is high, no byproduct is produced in the production process, safety and environmental protection are achieved, automatic production can be achieved, and the alumina-based foamed ceramic spherical shell prepared in the invention is high in strength, uniform in wall thickness and controllable in density, wall thickness, sphere size and normal-temperature mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic spherical shells. Specifically relates to a method for preparing an alumina-based foam ceramic spherical shell used in civil air defense projects. Background technique [0002] Foamed ceramic spherical shell is a new type of protective material emerging in the field of protective engineering. It has the dual characteristics of high energy absorption of porous materials and high strength of shell structures; in terms of energy absorption, porous materials and shell structures can also interact. Effect, the energy absorption effect is greater than the superposition of the energy absorption effect of independent porous materials and independent shell structures under the same loading conditions, so it has a broad application space in the fields of impact dynamics and civil air defense engineering. [0003] Xu Xingxing et al. (Xu Xingxing, Qi Fei, Wang Xiuhui, et al. Preparation of porous alumin...

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Problems solved by technology

The particle size of the ceramic foam microspheres prepared by this technology is only 0.3~5mm, and the process is complicated. The by-products in the production process are harmful to the environment and consume a lot of energy.

[0005] The parameter indicators corresponding to the national standard (GB / T 3995-2014) of high-alumina heat-insulating refractory bricks, which are also foam ceramic materials, show 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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