Method for preparing ligh high strength aluminium oxide hollow ball ceramic

Abstract

The light high-strength alumina ceramic ball has phosphoric acid solution as binding agent, alpha-alumina powder as basic material and hollow alumina ball as aggregate. Compared with dense refractory material, it has low density, high heat shock resistance, good heat insulating performance, low heat capacity and other features; and compared with common heat insulating material, it has high compression strength, high loaded softening temperature, low re-burning linear shrinkage and other features. It may be used as heat insulating material directly and may be also used in direct contact with flame, such as being used as lining material in high temperature furnace and kiln. In addition, its strength may be further raised in secondary sintering.

Description

Technical field [0001] The invention relates to a method for preparing light-weight and high-strength alumina hollow sphere ceramics. 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 conductivity by introducing pores, the introduction of a large number of pores will lead to an increase in the heat...

AI Technical Summary

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.