Prepn process of lithium aluminate substrate material

A technology of lithium aluminate substrate and lithium nitrate, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of volatile Li, poor thermal stability, and complicated preparation process, so as to promote the combination Separation, improvement of crystallinity, and the effect of inhibiting volatilization

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of molten salt hydrolysis method and solution method is complicated, and there is a certain amount of amorphous components in the product, which need to be removed by high temperature calcination
[0005] The solid phase synthesis reaction is the preparation of γ-LiAlO 2 important method, due to the preparation of γ-LiAlO

Method used

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  • Prepn process of lithium aluminate substrate material

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Example Embodiment

[0011] The preparation method of the lithium aluminate substrate material of the present invention adopts the sol-gel method, which mainly includes several steps: preparation of alumina sol, preparation of aluminum-lithium xerogel powder, pre-calcination, infiltration, and burning

[0012] Said sol-gel method is that the purity is 97-99%, and the pseudo-boehmite whose crystal grain size is 80-100nm compares boehmite according to mass: water=5-10%: 95-90% Ratio, adjust the pH of the solution to 1-3 with a 30% nitric acid solution to obtain an alumina sol.

[0013] Said sol-gel method is to add lithium nitrate with a purity of 99.999% into the alumina sol at a molar ratio of lithium nitrate:pseudoboehmite=1.1-1.2:1; mechanically stir for 6-12 After standing still for an hour, aluminum lithium gel was obtained.

[0014] In the sol-gel method, the aluminum-lithium gel is dried in a constant temperature oven at a temperature of 110°C-120°C for 48-96 hours to obtain aluminum-lithiu...

Example Embodiment

[0019] Example 1

[0020] Example 1 is carried out according to the process flow described in Fig. 1. According to the ratio of mass comparison boehmite: water=5%: 95%, take by weighing pseudo-boehmite with a purity of 99%, add deionized water, stir at room temperature, and adjust with a concentration of 30% nitric acid solution The pH of the solution is 3 to obtain alumina sol; according to the ratio of lithium nitrate in molar ratio:pseudoboehmite=1.1:1, lithium nitrate with a purity of 99.999% is weighed and added to the alumina sol, mechanically stirred for 6 hours and left to stand , to obtain an aluminum-lithium gel; the gel is placed in a constant temperature oven for drying, the setting temperature is 110 ° C, and the time is 96 hours to obtain an aluminum-lithium xerogel powder; the aluminum-lithium xerogel powder is placed in a corundum crucible, Without a cover, the temperature is 600°C, the time is 2 hours, and the pre-burned powder is obtained; take another corun...

Example Embodiment

[0021] Example 2

[0022] Example 2 is carried out according to the process flow described in Fig. 1. According to the mass comparison boehmite: the ratio of water=8%:92%, take the pseudo-boehmite with a purity of 98%, add deionized water, stir at room temperature, and adjust with a 30% nitric acid solution Solution pH=2, obtain alumina sol; According to the ratio of molar ratio lithium nitrate:pseudoboehmite=1.15:1, take lithium nitrate with a purity of 99.999% and add it to alumina sol, mechanically stir for 8 hours and then let it stand , to obtain an aluminum-lithium gel; the gel is placed in a constant temperature oven for drying, the setting temperature is 110 ° C, and the time is 72 hours to obtain an aluminum-lithium xerogel powder; the aluminum-lithium xerogel powder is placed in a corundum crucible, Without a cover, the temperature is 700°C, and the time is 3 hours, to obtain pre-burned powder; take another corundum crucible with a cover, fill it with lithium nitrat...

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Abstract

The present invention relates to preparation process of lithium aluminate backing material, and belongs to the field of material preparing technology. The present invention features that dry gel powder is first prepared with pseudoboehmite and lithium nitrate as material and through a sol-gel process, then pre-burnt and finally high temperature ignited in Li permeated corundum crucible to obtain lithium aluminate. The said process selects nanometer pseudoboehmite in high crystallinity as Al source and reaction crystal nucleus to improve the crystallinity and granularity of the lithium aluminate product, adopts sol-gel process to obtain homogeneous components of the lithium aluminate, and has high temperature ignited in Li permeated corundum crucible to inhibit the volatilization of Li.

Description

【Technical field】 [0001] The invention relates to a method for preparing a lithium aluminate substrate material, belonging to the technical field of material preparation and synthesis. 【Background technique】 [0002] Group III nitrides represented by GaN and its InGaN and AlInGaN microstructures are important semiconductor materials currently used. Limited by thermodynamics, GaN thin films can only be grown on suitable substrate materials. It was found that γ-LiAlO 2 It has high lattice matching and thermal performance matching with GaN thin film, and has become a new type of substrate material with great application prospects. [0003] Lithium metaaluminate has three allotropes, namely α-LiAlO 2 , β-LiAlO 2 and γ-LiAlO 2 , where α-LiAlO 2 Belongs to the hexagonal crystal structure, β-LiAlO 2 is monoclinic, and γ-LiAlO 2 It belongs to the tetragonal crystal system. They have different stabilities, α-LiAlO 2 It is stable at low temperature and transforms into γ-phas...

Claims

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Application Information

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IPC IPC(8): C01F7/04
Inventor 王达健顾铁成
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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