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Preparation method of aluminum borate crystal

A technology of aluminum borate and crystals, which is applied in the field of preparation of aluminum borate crystals, can solve the problems of component segregation, volatile, low melting point of boron oxide, etc., and achieve the effect of improving activity, reducing energy consumption and avoiding component segregation

Inactive Publication Date: 2011-09-21
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is not easy to operate
[0008] The above-mentioned different preparation methods all use boron oxide as a raw material, and boron oxide has a very low melting point (450°C) and is easily volatile in the temperature range of 1000°C to 2000°C, making the preparation process difficult to control, especially in large-scale preparation. easy to cause Al 18 B 4 o 33 Composition segregation, forming such as AlBO, Al 4 B 2 o 9 low aluminum boron phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] AlB 2 Powder and Al powder are mixed with the molar ratio of 0.9:8, and the mixed powder is fully ground; Then put into the burning boat, then put the burning boat into the heat treatment furnace, feed 100ml / min flowing oxygen in the furnace (volume purity is 99.7% ), at the same time the heat treatment furnace is heated up to 900°C at 3°C / min, the holding time is 6 hours, and then cooled to room temperature at 5°C / min to obtain Al 18 B 4 o 33 Crystal, Al in crystal 18 B 4 o 33 The mass content is 85%.

Embodiment 2

[0026] AlB 2 Powder and Al powder are mixed with the molar ratio of 1.0:8, and the mixed powder is fully ground; Then put into the burning boat, put the burning boat into the heat treatment furnace again, pass into 200ml / min flowing oxygen in the furnace (volume purity is 99.7% ), at the same time the heat treatment furnace is heated up to 950°C at 3°C / min, the holding time is 5 hours, and then cooled at 5°C / min to obtain Al 18 B 4 o 33 Crystal, Al in crystal 18 B 4 o 33 The mass content is 97%.

Embodiment 3

[0028] AlB 2 The powder and Al powder were mixed in a molar ratio of 1.1:8. Mix the powder and grind it thoroughly; then put it into the burning boat, put the burning boat into the heat treatment furnace, feed 250ml / min flowing oxygen into the furnace (the volume purity is 99.7%), and heat the heat treatment furnace at 3°C / min to 1000 ℃, holding time for 2 hours, and then furnace cooling at 5℃ / min to obtain Al 18 B 4 o 33 Crystal, Al in crystal 18 B 4 o 33 The mass content is 95%.

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Abstract

The invention relates to a preparation method of an aluminum borate crystal, which prepares the aluminum borate crystal through a solid phase reaction method, and the preparation process is as follows: (1) AlB2 powder and aluminum powder are fully mixed by the molar ratio of AlB2: Al=0.9 to 1.2:8; and (2) the mixed powder is sintered in a heat treatment furnace, the furnace temperature is controlled to be 900 to 1100DEG C, oxygen with the volume purity of 99.7 percent is fed into during the sintering process, the sintering time is 2 to 6h, and the Al18B4O33 crystal is obtained. The preparation method of the aluminum borate crystal has the advantages of easy operation, simple raw materials, no need of complicated equipment, low production cost, little energy consumption and easy mass production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and inorganic compound synthesis, and in particular relates to a method for preparing aluminum borate crystals. Background technique [0002] al 18 B 4 o 33 (9Al 2 o 3 2B 2 o 3 ) The material belongs to the polyborate crystal structure type, and it is a high-strength material with unique properties in the borate compound crystal. al 18 B 4 o 33 Has a low density (2.94g / cm 3 ), high melting point (1440°C), small coefficient of thermal expansion (4.2×10 -6 / k), small thermal conductivity (4~5w / m.k), high tensile strength (8GPa), under certain preparation conditions, it is easy to form needle-like crystals, which are called whiskers, so they are often used to add Add strength, wear resistance, and heat resistance to various materials to improve the mechanical properties of the material. It has been obtained in aluminum-based, magnesium-based composite materials, engineering plas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/12
Inventor 熊晓梅闫果刘国庆贾佳林焦高峰纪平
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH