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Preparation method of high-density bismuth vanadate ceramic

A technology of density bismuth vanadate and bismuth vanadate, which is applied in the field of functional ceramic materials, can solve the problem that bismuth vanadate is difficult to sinter into ceramics, etc., achieve high density, ensure conversion rate and production efficiency, and inhibit volatilization.

Active Publication Date: 2014-10-22
CHEM & CHEM ENG GUANGDONG LAB
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that bismuth vanadate is difficult to sinter into porcelain, and provide a method capable of preparing high-density bismuth vanadate ceramics

Method used

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  • Preparation method of high-density bismuth vanadate ceramic
  • Preparation method of high-density bismuth vanadate ceramic
  • Preparation method of high-density bismuth vanadate ceramic

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Embodiment Construction

[0021] The high-density bismuth vanadate ceramics of the present invention use Bi 2 o 3 and V 2 o 5 The powder is the raw material, which is fired twice, and can be prepared by the following steps.

[0022] Step 1. Put Bi 2 o 3 and V 2 o 5 The powder is mixed according to the molar ratio of 1:1 and put into the grinding equipment. It is manually ground for 5 hours. When grinding, absolute ethanol is used as the solvent to keep the particles uniform and not to generate powder dust. The added anhydrous The amount of ethanol is about 5% of the mass of the powder. It is guaranteed that it can be volatilized completely after grinding and will not remain in the powder. The ground powder is dried and pressed into tablets.

[0023] Step 2. Put the pressed tablet into a sealed quartz mold, put it in a muffle furnace and pre-fire it at 890 °C for 12 hours, and then anneal and cool down naturally; , the smaller the remaining space, the better. The volume of the quartz mold shou...

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Abstract

The invention discloses a preparation method of high-density bismuth vanadate ceramic. The prepared bismuth vanadate ceramic has the density of more than 97%. The preparation method comprises the steps of with Bi2O3 powder and V2O5 powder as raw materials, mixing and tabletting, then, presintering at the temperature of 890 DEG C in a sealed quartz die, and then, grinding into powder; tabletting again, and calcining in the sealed quartz die; after the calcining is ended, cooling from 890 DEG C to 800 DEG C at the speed of 1.5 DEG C / min, cooling to 700 DEG C at the speed of 1.7 DEG C / min, then, cooling to 550 DEG C at the speed of 2.5 DEG C / min, and next, cooling to 350 DEG C at the speed of 3.3 DEG C / min; finally, naturally cooling to room temperature, and then, polishing to obtain the orange yellow bismuth vanadate ceramic.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a preparation method of high-density bismuth vanadate ceramics. Background technique [0002] Functional materials are the core of the field of new materials, and play an important role in promoting and supporting the development of high-tech. In the field of new materials in the world, functional materials account for about 85%. Functional ceramic materials are an important part of functional materials and have many excellent properties, which are highly valued by the scientific and technological circles and business circles. [0003] Bismuth vanadate (referred to as 184 yellow) is an important inorganic yellow pigment with the characteristics of non-toxicity, bright color and stable chemical properties. Bismuth vanadate is a semiconductor material with a narrow band gap ( E g = 2.4 eV), which has good oxygen production activity under visible light ir...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/64
Inventor 李国岭李海生王赵武曹京晓王丹丹马海祥刘书丽孙广宇郜元煜郑博含黄海明臧国忠李立本
Owner CHEM & CHEM ENG GUANGDONG LAB
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