A fine solid phase sintering method for inhibiting potassium volatilization of potassium niobate ceramic powder

By using potassium bicarbonate instead of potassium carbonate and combining multi-gradient sintering and a second sintering method, the problem of compositional deviation caused by the volatilization of potassium niobate powder was solved, and high-purity, low-cost potassium niobate powder preparation was achieved.

CN119841640BActive Publication Date: 2026-01-16XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202510051074.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2026-01-16
Estimated Expiration
2045-01-13

AI Technical Summary

Technical Problem

Existing technologies for preparing potassium niobate powder suffer from compositional deviations caused by the volatilization of potassium (K) element. Furthermore, traditional methods are costly, require demanding equipment, or involve the use of harmful raw materials, making it difficult to achieve high-purity, low-cost powder preparation.

Method used

Potassium bicarbonate was used as a substitute for potassium carbonate as a raw material, and the volatilization of potassium was controlled by combining multi-gradient sintering with a second sintering method. The sintering process of the powder was optimized by combining the pre-sintering time and temperature of the powder.

Benefits of technology

It effectively suppresses the volatilization of potassium (K), improves the accuracy and purity of potassium niobate powder composition, simplifies the preparation process, reduces costs, and is suitable for laboratory and industrial applications.

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Abstract

The application discloses a fine solid-phase sintering method for inhibiting potassium volatilization of potassium niobate ceramic powder, and first, according to the molar ratio of KHCO3:Nb2O5=2-2.02:1, the powder raw materials KHCO3 and Nb2O5 required for preparing different mass of potassium niobate are weighed, and the weighed powder raw materials are subjected to multi-gradient sintering, and according to the quantitative relationship between the mass of the multi-gradient sintered powder raw materials and the sintering time, the potassium niobate powder is preliminarily prepared; then, the preliminarily prepared potassium niobate powder is subjected to second sintering, and the final active potassium niobate powder is obtained; the potassium bicarbonate which is not sensitive to air is used as the raw material to replace the potassium carbonate which is easy to absorb moisture in the air, the volatilization of the K element can be better controlled, the characteristics of the potassium carbonate absorbing moisture and the problem that the prepared potassium niobate ceramic powder deviates from the proportioning are solved; and through controlling the temperature and time when the K element volatilizes, the composition deviation of the potassium niobate caused by the indefinite pre-sintering holding time is avoided, and the powder process for accurately preparing the potassium niobate and other potassium-containing oxide materials is achieved.
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