Preparation method for gamma-AlON transparent ceramic powder

A technology for transparent ceramics and powders, which is applied in the preparation of pure-phase γ-AlON transparent ceramic powders and γ-AlON transparent ceramic powders by carbothermal reduction of α-Al2O3, which can solve the problem of poor light transmittance of AlON powders, gas Difficult to control the discharge speed, difficult to discharge the adsorbed gas, etc., to achieve the effect of shortening the required time, saving vacuuming time and improving efficiency

Active Publication Date: 2014-04-30
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, γ-Al 2 o 3 It is difficult to discharge the adsorbed gas in the preparation of AlON transparent ceramic powder by carbothermal reduction method, the gas discharge speed is difficult to control, and the pumping time is extremely long (in order to increase the vacuum degree in the furnace at a very slow speed, the valve of the vacuum equipment must be slowly opened And before inflating, it must be heated up slowly and kept warm for a long time in sections), while α / γ-Al 2 o 3 The prepared AlON powder has poor light transmittance

Method used

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  • Preparation method for gamma-AlON transparent ceramic powder
  • Preparation method for gamma-AlON transparent ceramic powder
  • Preparation method for gamma-AlON transparent ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] ① Ingredients: α-Al with an average particle size of 30nm 2 o 3 And analytically pure activated carbon particles are used as raw materials, the content of activated carbon (analytical pure) in the raw material is 5.6wt.%, absolute ethanol is used as the ball milling medium, and the mixed powder is mixed at a speed of 170r / min for 24h;

[0037] ②Drying: Put the slurry obtained in step ① into an open container, heat the slurry until it boils, so that the absolute ethanol can be discharged quickly, and then pass the dried mixed powder through a 50-mesh sieve to obtain a specific surface area of ​​56m 2 / g of α-Al 2 o 3 Mix powder with activated carbon;

[0038] ③Charging: Lay an alumina plate on the bottom of the graphite crucible, loosely load the mixed powder obtained in step ② into the above-mentioned graphite crucible, the powder filling height is 30mm, and set air holes through the top and bottom of the powder on the mixed powder to the alumina plate , the pore di...

Embodiment 2

[0043] Example 2 According to the method of Example 1, the difference is that step 1. the mixed powder is mixed at 250r / min for 24h, and the specific surface area of ​​the mixed powder obtained after step 2. is dried is 73m 2 / g. The XRD results of the prepared powder are shown in figure 1 (d), is pure phase γ-AlON.

Embodiment 3～4

[0045] Examples 3-4 The AlON ceramic powder is sintered according to the method of Examples 1-2, except that the carbon removal process is 620° C. for 5 hours.

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Abstract

The invention relates to a method for preparing pure-phase gamma-AlON transparent ceramic powder by carbothermal reduction of gamma-Al2O3, and belongs to the field of preparation of transparent ceramic materials. According to the preparation method, nano-alpha-Al2O3 and activated carbon are taken as raw materials; powder is filled in a graphite crucible loosely, wherein an aluminum oxide plate is paved at the bottom of the graphite crucible; an air hole which penetrates through the powder is preformed at the aluminum oxide plate; a graphite cover provided with fine and dense air holes is used for covering the hole; the pure-phase gamma-AlON transparent ceramic powder is prepared by adopting a two-step heating process in a flowing nitrogen environment with a micro positive pressure. By the adoption of the preparation method, the vacuumizing difficulty can be effectively reduced, powder is prevented from scattering in a vacuumizing stage, the time required for discharging adsorbed gas can be greatly shortened, the vacuumizing speed is high, and the preparation efficiency of the gamma-AlON powder is greatly improved; the obtained gamma-AlON powder phase has stable and reliable compositions and can be used for pressure-less sintering preparation of AlON transparent ceramics with high transmittance; the process is simple and is easy to operate, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a γ-AlON transparent ceramic powder, in particular to an α-Al 2 o 3 The invention discloses a method for preparing pure-phase gamma-AlON transparent ceramic powder by carbothermal reduction, which belongs to the technical field of transparent ceramic powder preparation. Background technique [0002] γ-AlON is a polycrystalline transparent ceramic material with an isotropic cubic structure and excellent optical and mechanical properties, which can be widely used in various industries, including aerospace, defense and security, semiconductor, energy and Consumer products make it have broad application prospects in the military and civilian fields. [0003] High-temperature solid-state reaction and reductive nitriding are two main methods for preparing AlON powders. Although the solid phase reaction method is simple in process, it requires AlN and Al as raw materials. 2 o 3 The powder must be high-purit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 单英春许建鑫徐久军王光
Owner DALIAN MARITIME UNIVERSITY
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