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Preparation method of high-purity AlON transparent ceramic powder

A technology of transparent ceramics and powders, which is applied in the field of preparation of high-purity γ-AlON transparent ceramic powders, can solve problems such as difficulty in ensuring consistency, slow research progress, and low maturity of process technology, so as to reduce preparation costs and improve Composition uniformity and high purity effect

Inactive Publication Date: 2016-06-01
TIANJIN JINHANG INST OF TECH PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All in all, the organic precursor method can effectively inhibit the agglomeration of nano raw material powder and improve the uniformity of raw material mixing, and can prepare γ-AlON powder with fine particles and high activity, but the maturity of the process technology is not high. Sexuality is difficult to guarantee, so the research progress is relatively slow

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  • Preparation method of high-purity AlON transparent ceramic powder
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  • Preparation method of high-purity AlON transparent ceramic powder

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preparation example Construction

[0043] A kind of preparation method of high-purity AlON transparent ceramic powder of the present invention comprises the following steps:

[0044] (1) Weighing of raw materials:

[0045] With C, Al 2 O is the raw material, according to the mass percentage: C content 4.5-6.5wt%, γ-Al 2 o 3 The content is 93.5~95.5wt%, the raw materials are weighed separately, and set aside;

[0046] The raw material C is active C powder, the purity is ≥99.75%, and the particle size is 10-100nm. Al mentioned in the raw material 2 o 3 For the following materials: γ-Al 2 o 3 Powder or γ-Al 2 o 3 Powder precursor; using γ-Al 2 o 3 When the precursor of powder, step (1) weighs the raw material and step (2) when preparing the premix liquid according to the Al in the precursor 2 o 3 Nominal content calculation.

[0047] (2) Premix preparation:

[0048] Add the raw materials in step (1) into pure water respectively, and disperse by one of the following methods: magnetic stirring, roller...

Embodiment 1

[0061] 1) Weigh the raw materials. According to the mass fraction ratio C:Al 2 o 3 =4.5wt%: 95.5wt%, take by weighing respectively C powder (purity 99.75%, average particle diameter is 20nm) 2.70g, γ-Al 2 o 3 Powder (purity 99.99%, average particle size is 50nm) 57.30g, standby;

[0062] 2) Premix preparation. a) Weigh 24.30g of pure water, add 0.14g of polyethylene glycol (PEG for short, molecular weight 6000) as a dispersant, then add the spare C powder in step 1), and stir magnetically at a rate of 500r / m for 6h , to obtain C suspension (the solid content of the powder is 10wt%, and the dispersing dose is 5wt% of the powder mass), for subsequent use; b) take by weighing 515.70g of pure water, add 0.29g of polyethylene glycol (abbreviated as PEG in English, molecular weight 6000) is a dispersant, and then the standby γ-Al in step 1) 2 o 3 Powder was added, and magnetically stirred at a rate of 500r / m for 6h to obtain γ-Al 2 o 3 Suspension (the solid content of the p...

Embodiment 2

[0068]1) Weigh the raw materials. According to the mass fraction ratio C:Al 2 o 3 =5.5wt%: 94.5wt%, take by weighing respectively C powder (purity 99.8%, average particle diameter is 50nm) 3.85g, γ-Al 2 o 3 Powder (purity 99.99%, average particle size is 50nm) 66.15g, standby;

[0069] 2) Premix preparation. a) Weigh 44.28g of pure water, add 0.13g of polyethylene glycol (PEG for short, molecular weight 6000) as a dispersant, add the spare C powder in step 1), and stir magnetically at a rate of 800r / m for 2h, Then put it on the roller ball mill, use wear-resistant zirconia as the grinding ball, the mass ratio of ball and powder is 5:1, mix ball milling with 70r / min for 20h, get C suspension (powder solid content is 8wt%, dispersing dose 3.5wt% of the powder mass), standby; b) take 712.08g of pure water, add 0.66g of polyethylene glycol (abbreviated as PEG in English, molecular weight 6000) as a dispersant, and then use the standby γ in step 1) -Al 2 o 3 Add the powder,...

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Abstract

The invention belongs to the technical field of synthesis and preparation of ceramic material powder, and in particular, relates to preparation of a high-purity gamma-AlON transparent ceramic powder. The preparation includes the following steps: (1) weighing raw material; (2) preparing a pre-mixed solution; (3) preparing a slurry; (4) carrying out freeze drying; (5) carrying out low temperature calcination; and (6) carrying out high temperature reaction synthesis, to obtain the gamma-AlON transparent ceramic powder. By using the freeze drying technology, water is sublimated at lower temperature, so that nano powder agglomeration in a water-based system can be effectively inhibited, an initial micro-morphology of the raw material can be maintained, and the mixed powder with fluffy organizational structure is obtained; compared with traditional spray drying, the freeze drying technology can reduce the loss of the raw material powder, can improve the utilization rate of the powder, and reduces the preparation cost.

Description

technical field [0001] The invention belongs to the technical field of ceramic material powder synthesis and preparation, and in particular relates to the preparation of high-purity gamma-AlON transparent ceramic powder. Background technique [0002] γ-AlON transparent ceramic is a new material integrating structure and function. It has low mass / strength ratio, mechanical properties close to sapphire, isotropic optical properties, and wide electromagnetic wave transmission range (0.2-6.5 μm), excellent dielectric properties and strong anti-radiation performance, etc., can be used in infrared windows, radomes, detector optical windows, light and high-strength bulletproof armor, semiconductor scanning windows, stomatology, etc. In recent years, it has become Research hotspots at home and abroad. [0003] The synthesis technology of γ-AlON transparent ceramic powder is one of the hotspots of current research at home and abroad. The main synthesis methods currently reported are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626
Inventor 张荣实王跃忠田猛
Owner TIANJIN JINHANG INST OF TECH PHYSICS
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