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Preparation method of Bi2O3 polycrystal

A technology of melting and bismuth oxide, which is applied in the growth of polycrystalline materials, chemical instruments and methods, and single crystal growth, can solve the problems of unsatisfactory industrialized large-scale production, high raw material purity requirements, and complicated preparation processes, and achieve considerable economic benefits. and social benefits, low raw material requirements, simple preparation process

Inactive Publication Date: 2011-08-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares α-Bi 2 o 3 Raw materials have high purity requirements, and the preparation yield is small and the efficiency is low, which cannot meet the needs of industrialized large-scale production
And the preparation process is complicated

Method used

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  • Preparation method of Bi2O3 polycrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step 1: Preparation of Bismuth Oxide Glass Melt

[0015] First, 83% of the Bi 2 o 3 and 17% SiO 2 Mix evenly to form a batch material; secondly, add the batch material to a corundum crucible with a cover at 1100 °C, and heat up to the melting temperature at a heating rate of 20 °C / min for melting to form a bismuth oxide high-temperature glass melt, and the melting temperature is 1200°C, and keep it at the melting temperature for 2 hours. During the melting process, use a corundum stirring rod to stir the bismuth oxide high-temperature glass melt for 1 minute every hour; then, cool the uniformly melted bismuth oxide high-temperature glass melt To 900°C, take out the crucible and pour the melt into a heat-resistant steel mold, put it into an annealing furnace at 400°C after the melt is solidified, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain a bismuth oxide glass melt;

[0016] Added SiO 2 Introduced through industrial quartz sand...

Embodiment 2

[0021] Step 1: Preparation of Bismuth Oxide Glass Melt

[0022] First, divide 80% Bi by mass fraction 2 o 3 and 20% SiO 2 Mix evenly to form a batch material; secondly, add the batch material to a corundum crucible with a cover at 1100 °C, and heat up to the melting temperature at a heating rate of 20 °C / min for melting to form a bismuth oxide high-temperature glass melt, and the melting temperature is 1250°C, and keep it at the melting temperature for 4 hours. During the melting process, use a corundum stirring rod to stir the bismuth oxide high-temperature glass melt for 1 minute every hour; then, cool the uniformly melted bismuth oxide high-temperature glass melt To 900°C, take out the crucible and pour the melt into a heat-resistant steel mold, put it into an annealing furnace at 400°C after the melt is solidified, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain a bismuth oxide glass melt;

[0023] Added SiO 2 Introduced through indus...

Embodiment 3

[0027] Step 1: Preparation of Bismuth Oxide Glass Melt

[0028] First, 81% of the Bi 2 o 3 and 19% SiO 2 Mix evenly to form a batch material; secondly, add the batch material to a corundum crucible with a cover at 1100 °C, and heat up to the melting temperature at a heating rate of 20 °C / min for melting to form a bismuth oxide high-temperature glass melt, and the melting temperature is 1230°C, and keep it at the melting temperature for 3 hours. During the melting process, use a corundum stirring rod to stir the bismuth oxide high-temperature glass melt for 1 minute every hour; then, cool the uniformly melted bismuth oxide high-temperature glass melt To 900°C, take out the crucible and pour the melt into a heat-resistant steel mold, put it into an annealing furnace at 400°C after the melt is solidified, keep it warm for 2 hours, and cool it down to room temperature naturally to obtain a bismuth oxide glass melt;

[0029] Added SiO 2 Introduced through industrial quartz sand...

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Abstract

The invention relates to a preparation method of Bi2O3 polycrystal, which comprises the following steps of: uniformly mixing Bi2O3 and SiO2 to form a mixture; adding the mixture to a corundum crucible at high temperature for fusing, then pouring the uniformly fused bismuth oxide high-temperature glass melt into a heat-resistant steel mould, and naturally cooling to a room temperature after annealing to obtain a bismuth oxide glass melt; placing the prepared uniform bismuth oxide glass melt in a muffle furnace, increasing the temperature at the speed of 5 DEG C per minute and preserving the temperature for 3-8 hours, and pulverizing the sample into particles with the size less than 50 meshes when cooling the sample to room temperature; and then placing the pulverized particle samples in 15%-20% hydrofluoric acid solution, soaking 1-3 hours to remove a non-crystalline phase SiO2 in the samples, and filtering to obtain the Bi2O3 polycrystal. No nucleating agent is added during the Bi2O3 polycrystal preparation, so that the prepared Bi2O3 polycrystal has the advantages of small and uniform size of crystal particles, high crystallinity, high crystal purity, less impurities, low requirement on raw materials, low cost, abundant source, lower synthetic temperature and simple preparation process, and is beneficial to industrial production.

Description

technical field [0001] The present invention relates to a kind of preparation method of polycrystal, relate in particular to a kind of Bi 2 o 3 Method for the preparation of polycrystals. Background technique [0002] Bi 2 o 3 It is an advanced functional material and one of the most important bismuth compounds. Due to its special physical properties and crystal morphology, it is widely used in various fields such as electronic ceramic materials, electrolyte materials, optoelectronic materials, sensors, microelectronic components, high-temperature superconducting materials, catalysts, ferroelectric materials, etc. In chemical reagents, bismuth salts, fireproof materials, high refractive index glass, nuclear engineering glass manufacturing and nuclear reactor fuel, etc. (Wu Shaohua, Liu Jin, Lan Yaozhong. Bi 2 o 3 Research status and development trend of preparation methods [J]. Hydrometallurgy, 2005, 24 (3): 121-127.). For example, Bi 2 o 3 It can be used as a semic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B28/00C01G29/00
Inventor 高档妮刘盼段新勇周小华
Owner SHAANXI UNIV OF SCI & TECH
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