A high-strength, low thermal conductivity zirconia fiber board and its preparation method

Abstract

The invention discloses a zirconia fiberboard with the high strength and low heat conductivity coefficient and a preparation method of the zirconia fiberboard. The method comprises the following steps: (1) weighing zirconia fibers, zirconia fiber powder, zirconia sol, and water according to corresponding mass; (2) pouring the weighed zirconia fibers, zirconia fiber powder, zirconia sol, and water into a thick liquid pool, performing uniform mixing through full stirring, and performing suck-filtration of the obtained thick liquid through a vacuum suck-filtration board-making machine to enable the obtained thick liquid to be sucked into a die of the machine, thereby obtaining a wet zirconia fiberboard having a certain specification; and (3) fully drying the wet zirconia fiberboard, performing constant-temperature sintering to obtain the zirconia fiberboard, and processing the obtained zirconia fiberboard through a machine to finally obtain the zirconia fiber product. The prepared zirconia fiberboard is high in strength, low in heat conductivity coefficient, and stable in high-temperature use performance.

Description

technical field [0001] The invention relates to the field of inorganic refractory materials, in particular to a zirconia fiber board and a preparation method thereof. Background technique [0002] Compared with other types of inorganic fiber materials, zirconia fiber has a high melting point, large thermal resistance coefficient, good burning resistance (it can still maintain a good fiber shape at 2500°C in the atmosphere), chemical corrosion resistance, and steam at high temperature. Low pressure and other characteristics, so zirconia fiber is mainly used to manufacture and process various fiber products, and is widely used in the lining of various high-temperature furnaces for heat insulation, etc.; it can also be used for lasers, fuel cell diaphragms, satellite and aircraft engine components and high temperature Or chemical corrosion gas filtration or catalyst carrier, etc.; because the thermal expansion coefficient of zirconia fiber is similar to that of many metals, all...

AI Technical Summary

Problems solved by technology

[0005] 2. Zirconia fiber is a one-dimensional material with a large aspect ratio, which is not easy to sinter, so the strength of the fiber product is poor;

[0006] 3. Polymeric zirconium salt will first produce decomposition reaction at high temperature, and then form zirconia, which has poor high temperature bonding ability and poor product strength

[0008] The preparation method, chemical composition and high-temperature performance of zirconia micropowder and zirconia fiber are different, and there is also a certain difference in thermal expansion coefficient between the two, which makes the product prone to cracking caused by internal stress during repeated use at high temperature. And affect the service life and heat insulation performance of the product