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Sol mixing-fine grinding-pressure method to improve the strength of mullite porous material

A porous material, mullite technology, applied in the field of new structural materials, porous materials, bioengineering, can solve the problems of uncontrollable porosity, narrow application range, low phase porosity, etc., to increase contact points and overlap , easy to operate, and the effect of improving strength

Active Publication Date: 2019-09-27
XIAN AERONAUTICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for improving the strength of mullite porous material by sol mixing-fine grinding-pressurization method, which solves the problem that mullite powder is a matrix phase with low porosity and low strength in the prior art, or Problems with high porosity, low strength, or uncontrollable porosity and narrow application range

Method used

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  • Sol mixing-fine grinding-pressure method to improve the strength of mullite porous material
  • Sol mixing-fine grinding-pressure method to improve the strength of mullite porous material

Examples

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Embodiment 1

[0025] Steps such as figure 1 Shown, step 1, take water as dispersion medium, according to the Al in polyaluminum chloride sol 2 o 3 and SiO in acidic silica sol 2 The molar ratio is 1:1.5 to obtain a mixed sol, which is magnetically stirred at a speed of 250r / min. At the same time, hydrofluoric acid with a mass concentration of 35% is slowly added dropwise at a speed of 80 drops / min as a catalyst, and the addition amount is aluminum oxide and 45% of the sum of the mass of silicon oxide, after the dropwise addition, continue magnetic stirring for 1.5h to obtain the precursor sol, and dry it in an oven at 75°C for 48h to completely remove the dispersion medium and become a dry glue;

[0026] Step 2. Put the dry glue into the dry corundum ball mill tank, add dry alumina grinding balls, the ball-to-material ratio is 1.7:1, the grinding balls are large balls with a diameter of 8mm: medium balls with a diameter of 4mm: small balls with a diameter of 1mm The ratio of the quantity...

Embodiment 2

[0030] Step 1, using water as the dispersion medium, according to the Al in polyaluminum chloride sol 2 o 3 and SiO in acidic silica sol 2 The molar ratio is 1:1.05 to obtain a mixed sol, which is magnetically stirred at a speed of 200r / min, and at the same time, hydrofluoric acid with a mass concentration of 30% is slowly added dropwise at a speed of 60 drops / min as a catalyst, and the addition amount is aluminum oxide and 30% of the sum of the mass of silicon oxide, after the dropwise addition, continue magnetic stirring for 1 hour to obtain the precursor sol, and dry it in an oven at 70°C for 48 hours to completely remove the dispersion medium and become a dry glue;

[0031] Step 2. Put the dry glue into the dry corundum ball milling tank, add dry alumina grinding balls, the mass ratio of balls to materials is 1.5:1, the grinding balls are large balls with a diameter of 8mm: medium balls with a diameter of 4mm: small balls with a diameter of 1mm The quantity ratio of the ...

Embodiment 3

[0035] Step 1, using water as the dispersion medium, according to the Al in polyaluminum chloride sol 2 o 3 and SiO in acidic silica sol 2The molar ratio is 1:1.76 to obtain a mixed sol, which is magnetically stirred at a speed of 400r / min. At the same time, hydrofluoric acid with a mass concentration of 44% is slowly added dropwise at a speed of 100 drops / min as a catalyst, and the addition amount is aluminum oxide and 58% of the sum of the mass of silicon oxide, after the dropwise addition, continue magnetic stirring for 2 hours to obtain the precursor sol, and dry it in an oven at 80°C for 48 hours to completely remove the dispersion medium and become a dry glue;

[0036] Step 2. Put the dry glue into the dry corundum ball mill tank, add dry alumina grinding balls, the mass ratio of balls to materials is 2:1, the grinding balls are large balls with a diameter of 8mm: medium balls with a diameter of 4mm: small balls with a diameter of 1mm The quantity ratio of the balls is...

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Abstract

The invention discloses a method used for increasing mullite porous material strength through sol mixing-fine grinding-pressurization. The method comprises following steps: 1, sol mixing, and magneticstirring are carried out, hydrofluoric acid is added drop by drop, an obtained precursor colloid is dried to remove a disperse medium so as to obtain a dried colloid; 2, the dried colloid is subjected to ball milling so as to obtain dry colloid fine powder; 3, the dry colloid fine powder is subjected to pressing so as to obtain a block-shaped blank material; and 4, the blank material is subjectedto calcining so as to obtain the mullite porous material. The method is capable of realizing real molecule grade uniform mixing of all reactants, increasing in-suit reaction rate, promoting reactioneffect, and increasing strength without influencing the whole porosity; no complex equipment is needed by the preparation technology; and operation is simple and convenient.

Description

technical field [0001] The invention belongs to the technical fields of new structural materials, porous materials and bioengineering, and in particular relates to a method for improving the strength of in-situ reaction mullite porous materials by a sol mixing-fine grinding-pressurizing method. Background technique [0002] Porous mullite has excellent properties such as good heat insulation, corrosion resistance, thermal shock resistance, high temperature stability, and low expansion coefficient, and has good applications in fields such as heat insulation, high temperature sealing, high temperature gas filtration, and molten metal filtration. The application prospect is one of the hot spots in the field of inorganic materials research. For example, Zhou Jianer et al. (Influence of aluminum raw materials on the synthesis of porous acicular mullite [J]. Journal of Ceramics, 2010, 31(1): 46-49) through the in-situ solid-state reaction sintering method, using aluminum raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/81C04B35/624C04B35/626C04B35/622C04B38/00B28B3/00
Inventor 张海鸿于方丽唐健江谢辉
Owner XIAN AERONAUTICAL UNIV
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