Method for preparing aluminum oxide ceramic substrate through gel casting by using three-stage drying method
Through the three-stage drying method, combined with chemical replacement, temperature-controlled microwave and hot air drying, the problems of cracks, deformation and low efficiency during the drying of alumina ceramic substrates in the gel injection molding process are solved, and more uniform and efficient drying is achieved, which significantly improves the yield and performance of the ceramic substrate.
CN119795355APending Publication Date: 2025-04-11SHANGHAI UNIV
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Patent Information
- Application Number
- CN202510198112.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-04-11
AI Technical Summary
Technical Problem
In the gel injection molding process, the alumina ceramic substrate is prone to cracks, deformation and low drying efficiency during the drying process, resulting in poor yield and performance.
Method used
Three-stage drying method is adopted, including chemical replacement drying, temperature-controlled microwave drying and hot air drying. Through a scientifically designed multi-stage drying process, capillary force is alleviated and drying uniformity and efficiency are improved.
Benefits of technology
It significantly reduces drying cracks and deformation rates, improves drying uniformity and efficiency, and improves the yield and performance of alumina ceramic substrates.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a method for preparing an aluminum oxide ceramic substrate through gel casting by using a three-stage drying method, which effectively reduces capillary force in a water evaporation process through replacement drying of polyethylene glycol, relieves the problem of rapid shrinkage of the surface of a green body, and avoids the phenomenon of internal high stress concentration through uniform diffusion of a replacement solution; in the microwave drying stage, synchronous migration of moisture inside and outside the green body is achieved through temperature control adjustment, the dry shell effect is avoided, finally hot air drying is carried out, and the compactness and dimensional precision of the finally sintered ceramic substrate are further improved. And the replacement drying and the microwave drying are combined, so that the moisture removal rate is obviously increased. Compared with a traditional natural drying mode or a single hot air drying mode, the whole drying time of the process is shortened by 30% or above. Through a scientifically designed three-stage drying process, the problems of cracks, deformation, low drying efficiency and the like in the preparation of the gel-casting aluminum oxide ceramic substrate are comprehensively solved, and the yield and the performance of the substrate are remarkably improved.
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