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Low-temperature preparation method of nano alpha-Al2O3 ceramic
The invention belongs to the technical field of ceramic low-temperature sintering, and particularly relates to a low-temperature preparation method of nano alpha-Al2O3 ceramic. A cold sintering process is adopted, aluminum hydroxide powder is used as a raw material, 2-20 wt.% of deionized water is used as a solvent, and the compact alpha-AlOOH ceramic is obtained under the uniaxial pressure of 500-2000 Mpa, the heating temperature of 200-500 DEG C and the heat preservation time of 50-300 min. Then, through a low-temperature annealing process, complete phase change from alpha-AlOOH to alpha-Al2O3 is achieved at the annealing temperature of 400-600 DEG C and the heat preservation time of 2-6 h, and finally an alpha-Al2O3 ceramic sintered body with the grain size of 30-50 nm is obtained. The method provided by the invention overcomes the technical problems that the sintering temperature of the traditional alpha-Al2O3 ceramic is high and a ceramic sintered body with a nanocrystalline structure is difficult to obtain, provides a process method for preparing the alpha-Al2O3 ceramic with the nanocrystalline structure at a low temperature, and is short in preparation period and strong in operability.
本发明属于陶瓷低温烧结技术领域，特别涉及一种纳米α‑Al2O3陶瓷的低温制备方法。发明采用冷烧结工艺，以氢氧化铝粉体为原料，2～20wt.％的去离子水为溶剂，在500～2000Mpa的单轴压力、200～500℃的加热温度、50～300min的保温时间下获得致密的α‑AlOOH陶瓷；随后，通过低温退火工艺，在400～600℃的退火温度，以及2～6h的保温时间下实现由α‑AlOOH到α‑Al2O3的完全相变，最终获得晶粒尺寸为30～50nm的α‑Al2O3陶瓷烧结体。本发明所述方法克服了传统α‑Al2O3陶瓷烧结温度高，难以获得纳米晶结构陶瓷烧结体的技术困境，提供了一种可在低温下制备具有纳米晶结构α‑Al2O3陶瓷的工艺方法，制备周期短，可操作性强。
Low-temperature preparation method of nano alpha-Al2O3 ceramic
The invention belongs to the technical field of ceramic low-temperature sintering, and particularly relates to a low-temperature preparation method of nano alpha-Al2O3 ceramic. A cold sintering process is adopted, aluminum hydroxide powder is used as a raw material, 2-20 wt.% of deionized water is used as a solvent, and the compact alpha-AlOOH ceramic is obtained under the uniaxial pressure of 500-2000 Mpa, the heating temperature of 200-500 DEG C and the heat preservation time of 50-300 min. Then, through a low-temperature annealing process, complete phase change from alpha-AlOOH to alpha-Al2O3 is achieved at the annealing temperature of 400-600 DEG C and the heat preservation time of 2-6 h, and finally an alpha-Al2O3 ceramic sintered body with the grain size of 30-50 nm is obtained. The method provided by the invention overcomes the technical problems that the sintering temperature of the traditional alpha-Al2O3 ceramic is high and a ceramic sintered body with a nanocrystalline structure is difficult to obtain, provides a process method for preparing the alpha-Al2O3 ceramic with the nanocrystalline structure at a low temperature, and is short in preparation period and strong in operability.
本发明属于陶瓷低温烧结技术领域，特别涉及一种纳米α‑Al2O3陶瓷的低温制备方法。发明采用冷烧结工艺，以氢氧化铝粉体为原料，2～20wt.％的去离子水为溶剂，在500～2000Mpa的单轴压力、200～500℃的加热温度、50～300min的保温时间下获得致密的α‑AlOOH陶瓷；随后，通过低温退火工艺，在400～600℃的退火温度，以及2～6h的保温时间下实现由α‑AlOOH到α‑Al2O3的完全相变，最终获得晶粒尺寸为30～50nm的α‑Al2O3陶瓷烧结体。本发明所述方法克服了传统α‑Al2O3陶瓷烧结温度高，难以获得纳米晶结构陶瓷烧结体的技术困境，提供了一种可在低温下制备具有纳米晶结构α‑Al2O3陶瓷的工艺方法，制备周期短，可操作性强。
Low-temperature preparation method of nano alpha-Al2O3 ceramic
一种纳米α-Al2O3陶瓷的低温制备方法
WANG HAOMIN (author) / CHEN RUICHONG (author) / HUANG ZHANGYI (author)
2024-08-13
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Al2O3-BN composite ceramic and preparation method thereof
| European Patent Office | 2021