A Low-Temperature Preparation Method for Nano-α-Al₂O₃ Ceramics
By combining cold sintering and low-temperature annealing, the problem of preparing nano-α-Al2O3 ceramics at low temperatures was solved, and high-quality nano-α-Al2O3 ceramics were prepared efficiently and economically.
CN118479866BActive Publication Date: 2026-06-02CHENGDU UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU UNIV
- Filing Date
- 2024-04-07
- Publication Date
- 2026-06-02
AI Technical Summary
Technical Problem
Existing technologies make it difficult to prepare high-purity and highly uniform nanostructured α-Al2O3 ceramics at low temperatures, and the high sintering temperature of traditional methods makes preparation difficult.
Method used
Hydrate (α-AlOOH) was prepared by cold sintering, and the phase transformation from α-AlOOH to α-Al2O3 was achieved by low-temperature annealing. Nano-α-Al2O3 ceramics were prepared by combining cold sintering and low-temperature annealing.
Benefits of technology
High-quality nano-α-Al2O3 ceramics were successfully prepared at low temperatures, overcoming the technical difficulties of traditional high-temperature sintering, with a short cycle and strong operability.
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Abstract
The application belongs to the technical field of ceramic low-temperature sintering, and particularly relates to a low-temperature preparation method of nano alpha-Al2O3 ceramic. The application adopts a cold sintering process, takes aluminum hydroxide powder as raw material, and takes 2-20 wt.% deionized water as solvent to obtain dense alpha-AlOOH ceramic under 500-2000 Mpa uniaxial pressure, 200-500 DEG C heating temperature and 50-300 min holding time; then, through a low-temperature annealing process, complete phase change from alpha-AlOOH to alpha-Al2O3 is realized under 400-600 DEG C annealing temperature and 2-6 h holding time, and finally alpha-Al2O3 ceramic sintered body with 30-50 nm grain size is obtained. The method overcomes the technical difficulty that traditional alpha-Al2O3 ceramic sintering temperature is high and it is difficult to obtain nano-crystal structure ceramic sintered body, and provides a process method for preparing alpha-Al2O3 ceramic with nano-crystal structure at low temperature, which has short preparation period and strong operability.
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