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Method for rapidly preparing AlON ceramic powder by means of carbon thermal reduction

A ceramic powder and fast technology, which is applied in the field of rapid preparation of AlON powder by carbothermal reduction, can solve the problem of incomplete conversion of AlON, and achieve the effects of easy ball milling post-processing, uniform particle size, and low raw material cost

Inactive Publication Date: 2012-12-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key technology of this method is to control the Al 2 o 3 and reducing agent (such as C), when the reducing agent content is too high, it is easy to generate AlN, resulting in a mixture of AlON and AlN in the final product; when the reducing agent content is too low, Al 2 o 3 Cannot be completely transformed into AlON phase, resulting in final products of AlON and Al 2 o 3 mixture

Method used

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  • Method for rapidly preparing AlON ceramic powder by means of carbon thermal reduction
  • Method for rapidly preparing AlON ceramic powder by means of carbon thermal reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, select high-purity γ-Al 2 o 3 Powder (average particle size is 20nm, specific surface area is 160m 2 / g) and carbon black (particle size 16nm) as raw materials to prepare AlON powder, which specifically includes the following steps:

[0029] (1) Weigh γ-Al 2 o 3 9.29g of powder and 0.71g of carbon black are mixed to obtain a mixture;

[0030] (2) Add the mixture into a polytetrafluoroethylene ball mill tank, and add 20g of high-purity alumina balls and 20g of absolute ethanol to it, then put the ball mill tank into a planetary high-energy ball mill, and mill for 12 hours;

[0031] (3) Dry the slurry obtained by the ball mill at 60°C, and pass through a 100-mesh sieve to obtain raw material powder;

[0032] (4) Put the raw material powder into a zirconia crucible with a diameter of 80mm, and then put it into a pressure furnace for sintering. The sintering conditions are: the pressure of nitrogen is 0.5MPa, the temperature is raised to 1800°C at a...

Embodiment 2

[0036] In this embodiment, select high-purity γ-Al 2 o 3 Powder (average particle size is 5nm, specific surface area is 180m 2 / g) and bamboo charcoal powder (particle size 100~200nm) as raw materials to prepare AlON powder, which specifically includes the following steps:

[0037] (1) Weigh γ-Al 2 o 3 Mix 9.5g of powder and 0.5g of bamboo charcoal powder to obtain a mixture;

[0038] (2) Add the mixture into a polytetrafluoroethylene ball mill tank, and add 20g of high-purity alumina balls and 20g of absolute ethanol to it, then put the ball mill tank into a planetary high-energy ball mill, and mill for 2 hours;

[0039] (3) Dry the slurry obtained by the ball mill at 40°C, and then pass through a 60-mesh sieve to obtain raw material powder;

[0040] (4) Put the raw material powder into a zirconia crucible with a diameter of 80mm, and then put it into a pressure furnace for calcination. The conditions for calcination are: the pressure of nitrogen is 0.1MPa, and the tempe...

Embodiment 3

[0044] In this embodiment, select high-purity γ-Al 2 o 3 Powder (average particle size 30nm, specific surface area 140m 2 / g) prepare AlON powder with flake graphite as raw material, specifically comprising the following steps:

[0045] (1) Weigh γ-Al 2 o 3 9.25g of powder and 0.75g of flake graphite are mixed to obtain a mixture;

[0046] (2) Add the mixture into a polytetrafluoroethylene ball mill tank, and add 20g of high-purity alumina balls and 20g of absolute ethanol to it, then put the ball mill tank into a planetary high-energy ball mill, and mill for 24 hours;

[0047] (3) The slurry obtained by the ball mill is dried at 100°C, and passed through a 200-mesh sieve to obtain raw material powder;

[0048] (4) Put the raw material powder into a zirconia crucible with a diameter of 80mm, and then put it into a pressure furnace for sintering. The sintering conditions are: the pressure of nitrogen is 0.6MPa, and the temperature is raised to 1600°C at a rate of 60°C / min. ...

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Abstract

The invention provides a method for rapidly preparing AlON ceramic powder by means of carbon thermal reduction. The method takes low-cost gamma-Al2O3 powder and a carbon source, uniformly mixing the raw materials by means of wet-process ball milling, then drying and putting the raw materials in a zirconium oxide crucible, conducting a high-temperature carbon thermal reduction nitridation reaction at the high-pressure nitrogen atmosphere of 0.1-1MPa, quickly synthesizing the AlON powder, and then removing carbon at the low temperature of 500-900 DEG C to obtain the superfine, high-purity and uniformly dispersed single-phase AlON powder. Compared with the prior art, rapid sintering and carbon thermal reduction are combined under the condition of high nitrogen pressure, so that the activity of the AlON powder is improved, the preparation process is simplified, the preparation cost is lowered, and the method has an excellent industrialized application prospect.

Description

technical field [0001] The invention belongs to the technical field of ceramic powder preparation, in particular to a method for rapidly preparing AlON powder by carbothermal reduction under high-pressure nitrogen conditions. Background technique [0002] Aluminum oxynitride (AlON) transparent ceramics have a series of excellent mechanical and optical properties. For example, its strength and hardness are as high as 380MPa and 1.9GPa, second only to sapphire; it has excellent light transmission (transmittance greater than 80%) in the range of near ultraviolet light to mid-infrared light, and the light transmission is isotropic Isotropic; with excellent wear resistance and chemical corrosion, etc., it has broad application prospects in transparent armor, missile fairing and photoelectric window. The preparation of AlON transparent ceramics with excellent performance requires high-purity, ultrafine and low-agglomerated AlON ceramic powders, so the preparation of AlON ceramic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 邓启煌胡春峰黄庆
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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