Micro-wave-regular sintering method of structural ceramic

Abstract

The invention belongs to the technical field of preparation of structural ceramic, and relates to a micro-wave-regular sintering method of a structural ceramic. The method includes steps of analyzing dielectric property of a structural ceramic along with the temperature changing rule, applying an electromagnetic field distribution simulation result to temperature field simulation software to simulate change status of dielectric constant and loss tangent of Y-TZP and ZTA material in microwave sintering process along with the temperature field on the basis of study of a three-dimensional electromagnetic simulation technique on electromagnetic field distribution of the structural ceramic in the microwave sintering cavity; testing change of the dielectric properties of the Y-TZP and ZTA along with the sintering temperature, contrasting the actual measured data with the simulated data; analyzing the difference, reason and influence factors; finding out the critical temperature of Y-TZP and ZTA with sharply increased dielectric loss in sintering process; then performing micro-wave-regular sintering on the prepared Y-TZP and ZTA samples. The micro-wave-regular sintering method is simple in technique, convenient to operate, scientific in principle, uniform in material heating, short in heating time, few in energy consumption, and convenient to perform the industrial production of the structural ceramic.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of structural ceramic preparation, and relates to a microwave-conventional sintered structural ceramic method. [0003] Background technique: [0004] Structural ceramic materials have the characteristics of high strength, high hardness, corrosion resistance, and high temperature resistance. They have become an important development area for new materials and have received widespread attention. [1] . Due to its special performance requirements, sintering technology different from traditional ceramic products is needed to prepare high-performance and low-cost structural ceramic materials and products. At present, the main sintering methods include atmospheric sintering, hot pressing sintering / hot isostatic pressing sintering, microwave sintering, arc plasma sintering, etc. Among them, as the field of structural ceramic material preparation, it is the most promising to replace traditional heating methods to a...

AI Technical Summary

Problems solved by technology

[0005] At present, there are two main problems in microwave sintering. One is related to the properties of materials in microwave. Most ceramics have a critical temperature. The dielectric loss is low from room temperature to the critical temperature point, and it is difficult to heat up. Once the material When the temperature is higher than the critical temperature, the dielectric loss of the material increases sharply, and the temperature rises very rapidly and even local melting occurs, forming a "hot spot". That is, at a certain temperature, the loss of the material in the microwave field will suddenly increase, resulting in thermal runaway. Cracking, because the dielectric loss characteristics of various materials change with temperature, it is very important and meaningful to establish a relevant database; the second is related to the existing microwave technology conditions, large-volume resonant cavity, poor uniformity of microwave field , it is difficult to sinter large products, so it is necessary to fully understand the behavior of materials in the microwave field, and to be able to fully and effectively control the microwave heating process

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