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Method for preparing stabilizing aluminum titanate at low temperature by non-hydrolytic sol-gel process

An aluminum titanate, non-hydrolysis technology, used in chemical instruments and methods, inorganic chemistry, titanium compounds, etc.

Inactive Publication Date: 2011-04-06
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the preparation of stabilized aluminum titanate at low temperature by non-hydrolytic sol-gel method at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] TiCl 4 The amount of the substance is taken as a reference, and the iron doping amount is 10 mol%. Weigh 0.697g of ferric ethanol (analytically pure) and place it in a conical flask, measure 10.5ml of absolute ethanol (analytical pure) and pour it into the conical flask, stir until the ferric ethanol dissolves, then place the conical flask in ice water In the mixed solution, measure 4ml titanium tetrachloride (chemically pure) with a pipette and quickly insert it below the liquid level of the ethanol solution, slowly add titanium tetrachloride, then add 9.707g anhydrous aluminum trichloride (analytical pure), 75 ℃ oil bath to heat to form an orange-red transparent solution, and after gelation at 110 ℃, a black dry gel will be formed directly, and the gel will be ground and heat-treated at 750 ℃ ​​to obtain stabilized aluminum titanate powder.

Embodiment 2

[0019] TiCl 4 The amount of the substance is taken as a reference, and the iron doping amount is 5 mol%. Weigh 0.348g of ferric acetate (analytical pure) and place it in a conical flask, measure 10.5ml of absolute ethanol (analytical pure) and pour it into the conical flask, stir until the ferric acetate dissolves, then place the conical flask in ice water In the mixed solution, measure 4ml titanium tetrachloride (chemically pure) with a pipette and quickly insert it below the liquid level of the ethanol solution, slowly add titanium tetrachloride, then add 9.707g anhydrous aluminum trichloride (analytical pure), 75 ℃ oil bath to heat to form an orange-red transparent solution, and after gelation at 110 ℃, a black dry gel will be formed directly, and the gel will be ground and heat-treated at 750 ℃ ​​to obtain stabilized aluminum titanate.

Embodiment 3

[0021] TiCl 4 The amount of the substance is taken as a reference, and the magnesium doping amount is taken as 20mol%. Measure 10.5ml of absolute ethanol (analytical grade) into a conical flask, place the conical flask in a mixture of ice and water, and measure 4.0ml of TiCl with a pipette 4 (chemically pure) quickly placed below the liquid level of low-carbon alcohol and slowly added to form an orange-yellow transparent solution, then add 9.707g of anhydrous aluminum trichloride (analytical pure), and heat in an oil bath at 75°C until a yellow-green transparent solution is formed, then Reflux at 110°C until a light red translucent wet gel is formed, add 15ml of dichloromethane (analytical pure) after cooling, stir until the gel is completely dissolved to form a bright yellow transparent solution, then add 0.835g magnesium ethylate (analytical pure), 50 ℃ reflux drying until gelation, the gel is ground and heat-treated at 750 ℃ ​​to obtain stabilized aluminum titanate powder....

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Abstract

The invention discloses a method for preparing stabilizing aluminum titanate at low temperature by a non-hydrolytic sol-gel process. In the method, anhydrous aluminum choride and titanium tetrachloride are used as precursors, anhydrous low-carbon alcohol is used as an oxygen donor, and ferric salt or magnesium salt or a compound of the ferric salt and the magnesium salt is used as a stabilizing agent, dry aluminum titanate gel is prepared through the non-hydrolytic sol-gel process, and finally the stabilizing aluminum titanate is obtained through calcining at 750 DEG C. The method for preparing the stabilizing aluminum titanate at low temperature has the prominent advantages of low synthesis temperature, short period, low cost, easy control, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic material modification, and in particular relates to a method for preparing stabilized aluminum titanate at low temperature by a non-hydrolytic sol-gel process. Background technique [0002] Aluminum titanate not only has a high melting point (1860°C) and low expansion (α<1.5×10 -6 / ℃), but also has the characteristics of low thermal conductivity (1.5W / m K), good thermal shock resistance and strong corrosion resistance, and has broad application prospects. However, aluminum titanate is easily decomposed into rutile and corundum phases in the range of 800-1280 °C, resulting in the loss of its excellent properties. Therefore, aluminum titanate must be stabilized before it can be used in practice. [0003] At home and abroad, the research on the stabilization of aluminum titanate has already begun in the 1970s, and the stabilization of aluminum titanate is usually achieved by doping with solid p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
Inventor 江伟辉冯果刘健敏胡紫谭训彦包镇红虞澎澎苗立峰
Owner JINGDEZHEN CERAMIC UNIV
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