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A kind of preparation method of single-phase mullite sol

A mullite and sol technology, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of long preparation cycle, poor repeatability, complex process, etc., and achieve the effect of low synthesis equipment requirements, reduced impact, and simple process

Active Publication Date: 2017-05-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, in the prior art, in the preparation process of single-phase mullite sol, either the energy consumption is high, the preparation cycle is long, or the process parameters (such as pH value, temperature, ambient humidity) are strictly required, and additional chelating agents need to be added , the process is complicated, the repeatability is poor, and the raw material is expensive alkoxide, which is not ideal

Method used

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  • A kind of preparation method of single-phase mullite sol
  • A kind of preparation method of single-phase mullite sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Single-phase mullite sol was prepared by using aluminum nitrate and ethyl orthosilicate as aluminum and silicon sources, and dilute nitric acid as decoagulant.

[0039] prepared as figure 1 shown in the following steps:

[0040] 1. Prepare aluminum nitrate into a 1M aqueous solution, and gradually add 0.5M ammonia water dropwise thereto until a precipitate forms, then stir at room temperature for 30 minutes, and then filter and wash to obtain a solid substance.

[0041] 2. Disperse the solid matter obtained by suction filtration in absolute ethanol at a mass ratio of 1:10, and stir at room temperature for 6 hours to obtain a white alumina suspension.

[0042] 3. Keep stirring at room temperature, add ethyl orthosilicate dropwise to the alumina suspension according to the Al / Si molar ratio of 3 / 1, and continue stirring for 2 hours after all the silicate is added dropwise.

[0043] 4. Keep the stirring at room temperature unchanged, add 2M dilute nitric acid dropwise to t...

Embodiment 2

[0046] Single-phase mullite sol was prepared by using aluminum chloride and tetraethyl orthosilicate as aluminum source and silicon source, and dilute hydrochloric acid as decoagulant.

[0047] Aluminum chloride was prepared into a 0.5M aqueous solution, and 0.2M potassium hydroxide aqueous solution was gradually added dropwise thereto until a precipitate formed, then stirred at room temperature for 60 minutes, and then filtered and washed to obtain a solid substance. The solid matter obtained by suction filtration was dispersed in absolute ethanol at a mass ratio of 1:20, and stirred at room temperature for 18 hours to obtain a white alumina suspension.

[0048] Keep stirring at room temperature, add ethyl orthosilicate dropwise to the alumina suspension according to the Al / Si molar ratio of 3 / 1, and continue stirring for 2 hours after all the silicate is added dropwise.

[0049] Keep stirring at room temperature, and add 1M dilute hydrochloric acid dropwise to the suspension...

Embodiment 3

[0051] Single-phase mullite sol was prepared by using aluminum sulfate and ethyl orthosilicate as aluminum source and silicon source, and dilute sulfuric acid as decoagulant.

[0052] Aluminum sulfate was prepared into a 2M aqueous solution, and 1M ammonia water was gradually added dropwise thereto until a precipitate formed, then stirred at room temperature for 60 min, and then centrifuged and washed to obtain a solid substance. The solid matter obtained by suction filtration was dispersed in absolute ethanol at a mass ratio of 1:10, and stirred at room temperature for 6 hours to obtain a white alumina suspension.

[0053] Keep stirring at room temperature, add ethyl orthosilicate dropwise to the alumina suspension according to the Al / Si molar ratio of 3 / 1, and continue stirring for 2 hours after all the silicate is added dropwise.

[0054] Keep stirring at room temperature, add 1M dilute sulfuric acid dropwise to the suspension according to the ratio of Al / H+ molar ratio 1 / 1...

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Abstract

The invention discloses a preparation method of single-phase mullite sol. The preparation method comprises the steps of preparing fresh aluminum hydroxide precipitate, preparing aluminum oxide suspension liquid, introducing a silicon source into the aluminum oxide suspension liquid, and carrying out decondensation on mixed suspension liquid, so as to prepare mullite sol. According to the preparation method, the requirement for inhibiting hydrolysis speed of aluminum alkoxide is avoided, process parameters such as pH value and environment humidity are not specially required, the process is simple, and the requirement on synthesis equipment is low; the preparation method is applicable to large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of single-phase mullite sol, which belongs to the technical field of chemical industry. Background technique [0002] Mullite is Al 2 o 3 -SiO 2 The only stable compound in the binary system, the stoichiometric formula is 3Al 2 o 3 2SiO2 2 , natural mullite is very rare, and high-performance mullite is artificially synthesized. Because mullite has outstanding physical and chemical properties, such as excellent high temperature oxidation resistance, creep resistance, corrosion resistance, low thermal expansion coefficient and thermal conductivity, low dielectric constant and dielectric loss, high mechanical Strength and toughness, etc. Mullite ceramics with mullite as the main crystal phase are considered to be a very ideal high-temperature engineering ceramics. In recent decades, mullite has received more and more attention in the fields of high-temperature thermal structure, electromagnetism and opt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26
Inventor 张剑吕毅杨小波赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH