Preparation process for strontium titanate voltage sensitive ceramics

Abstract

The invention belongs to the technical field of preparation of voltage dependent resistor materials and particularly relates to a preparation process for strontium titanate voltage sensitive ceramics. The preparation process comprises the following steps: improving burdening precision; pretreating raw materials by using a gamma radiant source; mixing the materials for two times, and controlling conditions for all the steps to obtain a product. Compared with the prior art, the preparation process disclosed by the invention has the following advantages that a 60Co gamma radiant source is used for radiating in the first-time material mixing process, so that part of raw materials can react in advance; the raw materials further react by raising the temperature, and further a strontium titanate crystalline phase with greater crystal grains is obtained; the sintering temperature is reduced under the condition of not adding lithium salts, a crystalline microstructure can be remarkably improved, and a crystal boundary is dense; main properties of the product are improved by an integrating effect of controlling all the conditions.

Description

technical field [0001] The invention belongs to the technical field of preparation of varistor raw materials, and in particular relates to a preparation process of strontium titanate varistor ceramics. Background technique [0002] Pressure-sensitive ceramics first appeared in the 1930s. At that time, SiC was used as the base material to make pressure-sensitive ceramics for arresters. With the gradual improvement of technology, pressure-sensitive ceramics based on zinc oxide and titanium oxide gradually appeared. Strontium acid-based multifunctional varistor ceramics, the varistor made of it not only has strong voltage stabilization and transient surge suppression functions, but also has strong filtering and noise elimination functions, but its impact on current surge The surge suppression ability is low, and the sintering process is demanding and the process is complicated, resulting in high cost. The semiconductorization of the crystal grains is realized in a high-temperat...

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Problems solved by technology

[0002] Pressure-sensitive ceramics first appeared in the 1930s. At that time, SiC was used as a base material to make pressure-sensitive ceramics for arresters. With the gradual improvement of technology, pressure-sensitive ceramics based on zinc oxide and titanium oxide gradually appeared. Strontium acid-based multifunctional varistor ceramics, the varistor made of it not only has strong voltage stabilization and transient surge suppression functions, but also has strong filtering and noise elimination functions, but its impact on current surge The surge suppression ability is low, and the sintering process is demanding and the process is complicated, resulting in high cost. The semiconductorization of the crystal grains is realized in a high-temperature reducing atmosphere. Therefore, such components are prone to aging and aging after long-term use in the air. It deteriorates the performance and limits its service life under high pressure conditions. Therefore, the preparation process of strontium titanate varistor ceramics should be further studied and improved.