Structural-thermal-insulation integrated and high-strength alumina bubble ceramic and preparation method thereof

Abstract

The invention discloses a structural-thermal-insulation integrated and high-strength alumina bubble ceramic and a preparation method thereof. The preparation method in which 30-70 wt% of the alumina bubble with a grain diameter of 0.2-5 mm is taken as aggregate comprises the following steps: adding a complex aqueous solution of phosphoric acid and aluminium ammonium sulfate with uniform stirring, wherein in the aqueous solution, the content of the phosphoric acid is 5-25 wt% and the content of the aluminium ammonium sulfate is 3-15 wt%, and the use level of the complex aqueous solution is 25-35 wt% of alpha-Al2O3 micro powder; stirring, adding 30-70 wt% of alpha-Al2O3 micro powder and stirring uniformly, preparing shaped bricks and special-shaped bricks in a vibrating manner under pressure, and finally using the bricks directly for masonry after oven drying at 200 DEG C, or after igniting and keeping a temperature at 1500-1700 DEG C for 4-10 hours. Compared with dense fire-proof materials, the ceramic disclosed by the invention has characteristics of low density and lightweight, thermal shock resistance, good heat preservation performance, low thermal capacity and the like. Compared with common thermal insulation materials, the ceramic disclosed by the invention has characteristics of high compression strength, high refractoriness under load, low linear shrinkage rate on reheating and the like. The ceramic can not only be used as thermal insulation layers, but also directly contact with flame, and thereby being an ideal inner lining construction material for an ultra-high-temperature furnace with a lightweight structure.

Description

technical field [0001] The invention relates to a preparation method of hollow sphere ceramics, in particular to a high-strength alumina hollow sphere ceramic with integrated structure and heat insulation and a preparation method thereof. Background technique [0002] Today, when traditional energy sources are increasingly depleted and new energy sources are developing slowly, the most urgent task at present is to develop lining materials that are lightweight, high-strength, good in thermal shock stability, and high in operating temperature to meet the needs of ultra-high-temperature furnaces with lightweight structures. Traditional ultra-high temperature furnaces have disadvantages such as large heat capacity, low heating rate, high energy consumption, short service life, and large mid-term maintenance due to the heavy structure. They save energy and serve the sustainable development of human beings. [0003] Since the heat insulation material obtains low thermal conductivi...

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Problems solved by technology

[0002] Today, when traditional energy sources are increasingly depleted and new energy sources are developing slowly, the most urgent task at present is to develop lining materials that are lightweight, high-strength, good in thermal shock stability, and high in operating temperature to meet the needs of ultra-high-temperature furnaces with lightweight structures. The traditional ultra-high temperature kiln has disadvantages such as large heat capacity, low heating rate, high energy consumption, short service life, and large mid-term maintenance due to the heavy structure. It saves energy and serves the sustainable development of mankind.

[0003] Since the heat insulation material obtains low thermal conductivity by introducing pores, the introduction of a large number of pores will lead to an increase in the heat insulation material refi It is difficult to increase the operating temperature and limit the application range, so finding new methods to prepare new high-temperature insulation materials has always been the focus of experts from various countries.

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