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Preparation method of calcined alumina powder for black ceramics

A technology of calcined alumina and black ceramics, which is applied in the field of preparation of calcined alumina powder, and can solve problems such as little increase in the color and yield of fired products, little effect of reducing sintering temperature, and failure to meet ideal requirements, etc. , to reduce the sintering temperature, increase the reactivity, and improve the activity

Inactive Publication Date: 2012-09-12
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While increasing the cost, it has little effect on reducing the sintering temperature, and the color and yield of fired products are not much improved, which cannot meet the ideal requirements.
At present, no manufacturer has started from changing the color of calcined alumina powder and stabilizing the high-temperature state of the colored oxide.

Method used

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preparation example Construction

[0020] A method for preparing calcined alumina powder for black ceramics. The preparation process is to mix activated alumina and black oxide salt solution in proportion, dry them, add additives capable of refining grains and mix evenly. After mixing The powder is put into a crucible, calcined in a high-temperature kiln to obtain black calcined alumina, and the black calcined alumina is ground to obtain calcined alumina powder for black ceramics.

[0021] The present invention comprises the following steps:

[0022] a: Evenly mix activated alumina and black oxide salt solution with 0.5-2% manganese salt, 0.5-2% cobalt salt, and 0.5-2% vanadium salt, and dry;

[0023] b: Add 0.1-1% ammonium chloride and 0.1-0.5% basic magnesium carbonate as additives for grain refinement to the dried material;

[0024] c: Add the mixed materials into the ball mill tank, add corundum balls about half of the amount of materials, and mix for about 30 minutes;

[0025] d: Pour the uniformly mixed...

Embodiment 1

[0030] Taking industrial alumina (that is, γ-alumina) (Zhengzhou Research Institute of Aluminum Corporation of China, the specific surface area is 110 m 2 / g) as a raw material, first mix a mixed solution of 1000g γ-alumina, 10g manganese chloride, 20g cobalt chloride, and 60g water, and dry it in an oven at 105°C, then add 5g chlorine Ammonium chloride and 2 grams of basic magnesium carbonate were poured into a ball mill jar with about 500 grams of balls and mixed for 30 minutes. Take it out and put it into a crucible, put it into a high-temperature furnace for calcination at 1330°C for 2.5 hours. The fired powder is ground in a stirring mill to obtain black α-alumina powder. The color of the product is black, the conversion rate is 95.0%, and the primary crystal size is 0.9-1.1 microns.

Embodiment 2

[0032] Use hydraulic alumina (ie ρ--alumina) (Zhengzhou Research Institute of Aluminum Corporation of China, with a specific surface area of ​​260 m 2 / g) as a raw material, first mix and stir a mixed solution of 1000g ρ--alumina, 10g manganese nitrate, 5g cobalt nitrate, 15g vanadium nitrate, and 60g water, dry in an oven at 110°C, and then add 6 grams of ammonium chloride and 3 grams of basic magnesium carbonate were poured into a ball mill jar with about 500 grams of balls and mixed for 30 minutes. Take it out and put it into a crucible, and put it into a high-temperature furnace for calcination at 1350°C for 2.5 hours. The fired powder is ground in a vibration mill to obtain black α-alumina powder. The color of the product is dark black, the conversion rate is 96.8%, and the primary crystal size is 0.5~0.7 microns.

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Abstract

The utility model provides a preparation method of calcined alumina powder for black ceramics and relates to a preparation method of calcined alumina powder suitable fore preparing bright high alumina black ceramics. The preparation method of the calcined alumina powder is characterized by comprising the following preparation steps: mixing activated alumina with salt solution of black oxide in proportion, drying and adding an additive capable of refining a crystal grain and uniformly mixing, adding mixed power into a crucible and adding into a high-temperature furnace for calcining to obtain black calcined alumina; and grinding the black calcined alumina to obtain the calcined alumina powder for the black ceramics. Through the method, as the activated alumina is uniformly mixed with the salt solution of the black oxide, the reaction area is increased, and the reaction activity is increased. Meanwhile, the additive capable of refining the crystal grain is added and is calcined into black powder at a proper temperature, the alumina and the black oxide form discontinuous solid solution, and the discontinuous solid solution can stably exist in the ceramic sintering process and is uniformly colorated. The preparation method is high in sintering activity, is suitable for low-temperature sintering and is convenient to operate.

Description

technical field [0001] The invention discloses a preparation method of calcined alumina powder for black ceramics, and relates to a preparation method of calcined alumina powder suitable for preparing bright-colored high-alumina black ceramics. Background technique [0002] High-alumina black ceramics are mainly used for the packaging of semiconductor integrated circuits, etc., based on Al 2 o 3 as the main body (Al 2 o 3 The content accounts for more than 90% of the total mass), so it has a series of advantages such as shading, good air tightness, strong radiation resistance, high strength, high hardness, wear resistance, high temperature resistance, good insulation, and acid and alkali resistance. performance, and its cheap price, easy access to raw materials, high reliability, more and more widely used in military products and civilian products, some of its irreplaceable characteristics make it have a broad market prospect and development space. At present, the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B22/12C04B22/08
Inventor 李晋峰王锦王舟杨洪山
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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