Sagger used for high-temperature firing and preparation method of sagger

Abstract

The invention relates to a sagger used for high-temperature firing and a preparation method of the sagger. The sagger used for high-temperature firing is formed by performing mixing forming by using aluminum oxide powder, kaolin powder, clay powder, white corundum, quartz and mullite as raw materials and performing high-temperature firing. The sagger used for high-temperature firing provided by the invention has a good thermal shock effect, low costs and long service life, and can maintain the crack resistance, uniformity and quality stability of a product during mass production, and is suitable for use in environments with larger temperature differences; the sagger used for high-temperature firing provided by the invention is produced during high-temperature firing, and compared with a sagger formed by synthesizing quartz and mullite in advance and performing mixing forming on the market, the sagger provided by the invention has a more uniform finished-product phase, better color andthermal shock stability, and a small phase thermal expansion coefficient, thereby having extremely high thermal shock stability; and the quartz is added, so that the thermal shock performance can be improved.

Description

technical field [0001] The invention relates to a sagger for high-temperature firing, in particular to a sagger for high-temperature firing and a preparation method thereof. Background technique [0002] The sagger is mainly used for high-temperature sintering (1000°C-1500°C) of high-purity alumina materials when high-purity alumina is fired at high temperature. The main component of the current sagger is Al 2 o 3 Mainly mullite or high alumina material. However, the current saggers have low service life, poor thermal shock effect, and are prone to cracking at high temperatures, resulting in kiln plugging and high breakage rates. [0003] The thermal shock performance of the current sagger is not ideal, the main reasons are as follows: First, due to the poor thermal shock effect of alumina itself, Al 2 o 3 The higher the content, the less the number of thermal shocks, and the temperature of firing high-purity alumina materials is generally at the highest temperature of ...

AI Technical Summary

Problems solved by technology

However, the current saggers have a low service life, poor thermal shock effect, and are prone to cracking at high temperatures, resulting in kiln plugging and high breakage rates.

[0003] The thermal shock performance of the current sagger is not ideal, the main reasons are as follows: First, due to the poor thermal shock effect of alumina itself, Al 2 o 3 The higher the content, the less the number of thermal shocks, and the temperature of firing high-purity alumina materials is generally at the highest temperature of 1000 ° C ~ 1500 ° C, it only takes 6 to 10 hours from room temperature to the highest temperature, and it only takes 3 to 8 hours to keep it warm. 6 to 9 hours, the heating and cooling speed is fast, the current sagger has poor resistance to rapid cooling and rapid heating, and is easy to crack at high temperature

Secondly, in the production of existing saggers, alumina is used as the main raw material to improve the product's shrinkage resistance, thermal shock resistance and temperature resistance, and the bulk density is generally 2.2kg / m 3 left and right, such long-term use of high energy consumption, energy waste

Thirdly, most of the existing saggers are molded by slurry suction. Because the thickness of the product wall and the bottom are different, and the force is different, the composition of the whole product is uneven, there are many weak parts, the crack resistance is poor, and mass production When the product differentiation is large, the quality is unstable

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