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Preparation method of gamma-type aluminum oxide transparent nanocrystalline ceramic material with optical quality similar to that of sapphire

An alumina nanometer and optical quality technology, applied in the field of transparent ceramic materials, can solve the problems of reduced ceramic density and optical transmittance, scarcity of transparent nanocrystalline ceramic materials, poor transparency of glass ceramics, etc., and achieves low cost and particle size. Small, uniform grain size distribution

Active Publication Date: 2022-08-05
NANCHANG UNIV
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  • Claims
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Problems solved by technology

French Beauvoir et al. (Thomas Hérisson de Beauvoir, Claude Estournès, Translucentγ-AlOOH andγ-Al 2 o 3 glass-ceramics using the cold sintering process, Scripta Materialia.194(2021) 113650) reported the preparation of translucent boehmite (γ-AlOOH) glass by cold press sintering at a pressure of 500 MPa and a temperature below 400 °C ceramics, followed by air annealing at 500°C to obtain translucent γ-Al 2 o 3 glass-ceramic materials, but the γ-Al 2 o 3 Glass ceramics have poor transparency and contain AlOOH heterophase
Although this method can prepare metastable γ-Al at low temperature 2 o 3 Glass ceramics, but its applied pressure is limited (100-500MPa order), so the decrease of sintering temperature will cause the decrease of ceramic density and optical transmittance, which is very important for the preparation of highly transparent γ-Al 2 o 3 Ceramics still have some difficulties
Therefore, the preparation of γ-Al with high light transmittance 2 o 3 Transparent ceramic materials still have great challenges, and γ-Al with high strength and high hardness and high transparency 2 o 3 Transparent nanocrystalline ceramic materials are even scarcer

Method used

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  • Preparation method of gamma-type aluminum oxide transparent nanocrystalline ceramic material with optical quality similar to that of sapphire
  • Preparation method of gamma-type aluminum oxide transparent nanocrystalline ceramic material with optical quality similar to that of sapphire
  • Preparation method of gamma-type aluminum oxide transparent nanocrystalline ceramic material with optical quality similar to that of sapphire

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Experimental program
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Embodiment 1

[0043] In this embodiment, γ-Al 2 O 3 The preparation method of nano-powder and transparent nano-crystalline ceramics is as follows:

[0044] 1. Preparation of gamma alumina nano-powder

[0045] 1) with Al (NO 3 ) 3 ·9H 2 O as raw material, Al(NO 3 ) 3 ·9H 2 O and (NH 4 ) 2 SO 4 Dissolved in deionized water, according to Al 3+ and SO 4 2- The molar ratio is 1:1.5 to prepare Al 3+ A mixed raw material solution with an ion concentration of 0.05 mol / L, ammonium bicarbonate is dissolved in a composite solvent of absolute ethanol and water, and the amount of absolute ethanol and water is measured in a volume ratio of 3:5, the prepared ammonium bicarbonate precipitant The concentration is 0.15mol / L.

[0046] 2) According to the ratio of the molar amount of aluminum ions and the molar amount of ammonium bicarbonate, it is 1:3 to measure the mixed raw material solution and the precipitant solution of the above step 1), and adjust the titration by a peristaltic pump at n...

Embodiment 2

[0054] In this embodiment, γ-Al 2 O 3 The preparation method of nano-powder and transparent nano-crystalline ceramics is as follows:

[0055] 1. Preparation of gamma alumina nano-powder

[0056] 1) with Al 2 (SO 4 ) 3 ·18H 2 O as raw material, Al 2 (SO 4 ) 3 ·18H 2 O and (NH 4 ) 2 SO 4 Dissolved in deionized water, according to Al 3+ and SO 4 2 -The molar ratio is 1:0.5 to formulate Al 3+ A mixed raw material solution with an ion concentration of 0.15mol / L, ammonium bicarbonate is dissolved in a composite solvent of absolute ethanol and water, and the amount of absolute ethanol and water is measured in a volume ratio of 2:5, and the prepared ammonium bicarbonate precipitant is prepared The concentration is 0.5mol / L.

[0057] 2) According to the ratio of the molar amount of aluminum ions and the molar amount of ammonium bicarbonate, it is 1:6 to measure the mixed raw material solution and the precipitant solution of the above step 1), and adjust the titration by ...

Embodiment 3

[0065] In this embodiment, γ-Al 2 O 3 The preparation method of nano-powder and transparent nano-crystalline ceramics is as follows:

[0066] 1. Preparation of gamma alumina nano-powder

[0067] 1) with NH 4 Al(SO 4 ) 2 ·12H 2 O as raw material, NH 4 Al(SO 4 ) 2 ·12H 2 O and (NH 4 ) 2 SO 4 Dissolved in deionized water, according to Al 3+ and SO 4 2- Al is formulated in a molar ratio of 1:1 3+ A mixed raw material solution with an ion concentration of 0.1 mol / L, ammonium bicarbonate is dissolved in a composite solvent of absolute ethanol and water, and the amount of absolute ethanol and water is measured in a volume ratio of 1:5, the prepared ammonium bicarbonate precipitant The concentration is 1.0mol / L.

[0068] 2) According to the ratio of the molar amount of aluminum ions and the molar amount of ammonium bicarbonate, it is 1:10 to measure the mixed raw material solution and the precipitant solution of the above step 1), and adjust the titration by a perista...

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Abstract

The invention discloses a preparation method of a gamma-type aluminum oxide transparent nanocrystalline ceramic material with optical quality similar to that of sapphire, and belongs to the technical field of transparent ceramic materials. The process method comprises the following steps: preparing a mixed raw material solution by taking aluminum salt and ammonium sulfate as raw materials, slowly dropwise adding the prepared mixed raw material solution into a precipitator prepared from ammonium bicarbonate, fully reacting to obtain a precipitate, washing the precipitate, performing suction filtration, drying, and roasting to obtain gamma-phase aluminum oxide nano powder; the prepared nano powder is loaded into a mold to form a biscuit, and then the biscuit is fed into two-side press equipment to be subjected to two-step ultrahigh-pressure sintering, so that the high-transparency gamma-Al2O3 transparent nanocrystalline ceramic is obtained. The prepared gamma type aluminum oxide novel transparent nanocrystalline ceramic material has the characteristics of high transmittance, high physical and chemical stability, excellent mechanical properties and the like which are comparable to sapphire single crystals, and the material is short in synthesis period and easy to realize batch production.

Description

technical field [0001] The invention belongs to the technical field of transparent ceramic materials, in particular to a preparation method of a gamma-type alumina transparent nanocrystalline ceramic material with near sapphire optical quality. Background technique [0002] Sapphire (α-Al 2 O 3 ) crystal has high hardness, high strength and excellent optical properties, is an important material for making optical windows and missile covers, and has a wide range of applications in transparent armor, photoelectric windows, missile fairings, etc. However, sapphire crystal has optical anisotropy, which makes it difficult to prepare and process, which limits its application in the field of high-tech technology to a certain extent. Transparent ceramic is a kind of high-density polycrystalline sintered body. It has the excellent physical and chemical properties of single crystal, such as high transparency, high melting point and high hardness, and the advantages of easy enlargeme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/115C04B35/622C04B35/645C04B35/626
CPCC04B35/115C04B35/622C04B35/645C04B35/62605C04B2235/443C04B2235/448C04B2235/442C04B2235/661C04B2235/781C04B2235/77C04B2235/9607C04B2235/96
Inventor 陈兴涛艾金水郑仁奎王立
Owner NANCHANG UNIV