A method for preparing rare earth doped quartz glass by composite acid catalyzed sol-gel
By using a sol-gel method catalyzed by a composite acid of HF and HCl, the hydrolysis and condensation behavior of rare earth-doped quartz glass was controlled. Combined with staged drying and low-pressure high-temperature densification, the problems of long gelation cycle, easy cracking and high hydroxyl content were solved, and the efficient preparation of low-hydroxyl transparent rare earth-doped quartz glass was achieved.
CN122809729APending Publication Date: 2026-09-25BEIJING UNIV OF TECH
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Patent Information
- Application Number
- CN202611288947.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-24
- Publication Date
- 2026-09-25
AI Technical Summary
Technical Problem
The preparation of rare earth-doped quartz glass in the existing technology has problems such as long gelation period, easy cracking, high hydroxyl content and need for complex powder processing, which affect optical performance and preparation efficiency.
Method used
A low-hydroxyl transparent rare-earth-doped quartz glass was prepared by using a sol-gel method catalyzed by a composite acid of HF and HCl to regulate hydrolysis and condensation behavior, combined with staged drying and low-pressure high-temperature densification.
Benefits of technology
It significantly shortens gelation time, improves crack resistance, reduces hydroxyl content, achieves integral molding without powder treatment, and maintains good optical properties.
✦ Generated by Eureka AI based on patent content.
Abstract
The application discloses a method for preparing rare earth doped quartz glass by composite acid catalyzed sol-gel, comprising the following steps: mixing tetraethyl orthosilicate, ethanol and deionized water, and adding HCl and HF to make the tetraethyl orthosilicate hydrolyze and polycondensate to form an initial silicon-oxygen network; adding an aluminum salt precursor and a rare earth salt precursor into the obtained system to obtain a doped silica sol, making the doped silica sol gelate and performing aging treatment; performing stage drying on the obtained whole wet gel to obtain a whole dry gel; performing stage heat treatment on the whole dry gel to obtain a porous precursor which maintains a whole form; and directly placing the porous precursor under low-pressure high-temperature conditions for densification treatment without performing powderization, grinding, powder pressing or re-molding to obtain transparent rare earth doped quartz glass. The application does not need powderization and secondary melting, and is suitable for preparation of rare earth doped quartz glass and optical fiber preform materials.
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