High-density calcium fluoride photoelectric ceramic and ultralow-temperature preparation method thereof

High-density calcium fluoride optoelectronic ceramics are prepared at low temperatures through reaction activation cold sintering technology, which solves the problems of oxygen defects and equipment corrosion caused by high-temperature sintering and realizes calcium fluoride ceramics with high mechanical properties, which are suitable for high-end optoelectronic systems.

CN120622927APending Publication Date: 2025-09-12HANGZHOU DIANZI UNIV +1
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Patent Information

Application Number
CN202510932780.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-07
Publication Date
2025-09-12

AI Technical Summary

Technical Problem

In the existing technology, high-temperature sintering of CaF2 ceramics leads to oxygen defects and high costs, and cold sintering in acidic solvents has equipment corrosion problems, making it difficult to achieve large-scale industrial production.

Method used

High-density calcium fluoride optoelectronic ceramics are prepared by reaction-activated cold sintering technology through applying uniaxial pressure and chemical reaction at low temperature (no higher than 350°C). Calcium hydroxide and ammonium fluoride are used as raw materials, the stoichiometric ratio is controlled, and the use of acidic solvents is avoided.

Benefits of technology

Ultra-low temperature preparation of high-density calcium fluoride optoelectronic ceramics has been achieved, with mechanical properties improved by 2-4 times, equipment corrosion avoided, the process simplified, costs reduced, and the needs of high-end optoelectronic applications met.

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Abstract

The invention belongs to the technical field of photoelectric ceramic material manufacturing, and relates to high-density calcium fluoride photoelectric ceramic and an ultralow-temperature preparation method thereof. The method comprises the following steps: S1, wet mixing: weighing calcium hydroxide (Ca (OH) 2) powder and ammonium fluoride (NH4F) powder according to a molar ratio of 1: (1.5-2), and mixing by taking an organic solvent as a medium to form slurry; s2, rapid drying: rapidly drying the slurry obtained in the step (1) to obtain mixed precursor powder; and S3, reaction cold sintering: putting the mixed precursor powder into a mold, and carrying out reaction cold sintering. The sintering temperature used in the method is not higher than 350 DEG C, and the sintering temperature can be changed according to actual needs so as to improve the mechanical property of the ceramic, and the mechanical property is improved by 2-4 times compared with that of a conventional hot pressed sintering sample.
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