High-performance and low-expansion ceramic product and preparation method thereof

Abstract

The invention discloses a high-performance and low-expansion ceramic product. The high-performance and low-expansion ceramic product comprises a green body layer and a glaze layer, wherein a transition layer is arranged between the green body layer and the glaze layer. In addition, the invention also discloses a preparation method for the above-mentioned high-performance and low-expansion ceramicproduct. According to the invention, through designing of a formulation system, a composite ceramic material composed of the green body layer, the transition layer and the glaze layer is formed, has good thermal shock resistance, is applicable to high-power electric appliances, thereby well meeting the use requirements of low-expansion ceramic products like heat-resistant cookwares and facilitating promoting technological progress and application development of the low-expansion ceramic industry.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a high-performance low-expansion ceramic product and a preparation method thereof. Background technique [0002] Thermal expansion is one of the main properties of ceramic materials, and the properties related to thermal expansion mainly include thermal shock resistance and mechanical properties of materials. When the material is subjected to large temperature changes, the thermal expansion coefficient directly affects the performance and safety of the material, so it is of great significance to develop low-expansion ceramic materials. At present, most of the expansion coefficients of ordinary low-expansion ceramic cookware in China are in the range of α (800～20℃) =3×10 -6 / °C, thermal shock resistance is 350-20°C water quenching once without cracking, spodumene is mainly used, and the low-expansion ceramics prepared by this system have a narrow firing range and a low...

AI Technical Summary

Problems solved by technology

However, there are very few ceramic products on the market that can meet the needs of high-power electrical appliances

To this end, many companies have also proposed different solutions, such as increasing the amount of lithium minerals added, or using ceramic materials that combine lithium minerals with cordierite, etc., but the expansion coefficient of the ceramic materials produced is still relatively large. are generally at α (800～20℃) =1.6×10 -6 / °C or higher, the best thermal shock resistance is 400-20 °C water quenching once without cracking, it is difficult to meet the new standard QB / T2580-2018 for low-expansion ceramic products such as fine heat-resistant cookware 450-20 °C once Use requirements for rapid cooling without cracking

In addition, there are also researches that use the coarse particle method for batching. Its thermal shock resistance can meet the national standard, but the bonding of the blank glaze is poor, the glaze layer is easy to crack, and it is difficult to sinter.

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