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Repairing method for defects of ceramic oxygen-permeable membrane

A repair method and oxygen-permeable membrane technology, applied in the field of functional ceramic materials, can solve the problems of uneven mixing of ceramic powder and additives, affecting the application effect of membranes, etc.

Active Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing ceramic oxygen permeable membrane, due to the uneven mixing between ceramic powder and additives during the preparation process or the sintering process, is likely to cause defects. The defects mainly appear in the form of pinhole-shaped holes with a size of 1 μm-50 μm, which affects the application of the membrane. Effect, the present invention aims to provide a method for repairing defects in ceramic oxygen-permeable membranes, which can effectively repair defects in ceramic oxygen-permeable membranes, and improve the effective utilization rate and yield of ceramic membrane materials

Method used

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  • Repairing method for defects of ceramic oxygen-permeable membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Composition of ingredients into Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ The hollow fiber oxygen permeable membrane is tested for air tightness, and defective membrane tubes are screened out.

[0046] (1) According to formula Ba 0.33 Sr 0.33 Ca 0.33 co 0.8 Fe 0.2 o 3-δ Among them, take each raw material according to the ratio of the above formula: BaCO 3 , SrCO 3 , CaCO 3 、Co 3 o 4 , Fe 2 o 3 Mix, add ethanol and carry out ball milling for 3 hours to obtain powder I, dry and sinter. Take out part of powder I and add ethanol to ball mill for 50h, then centrifuge at 15000r / min for 15min to obtain powder II and dry it. Mix powder I (particle size 1-10 μm) and powder II (particle size 100-1000 nm) at a mass ratio of 1:1 as a restoration material.

[0047] (2) Disperse the above restoration materials in ethanol at a mass concentration of 1%, and disperse evenly in an ultrasonic instrument. Seal one end of the defective membrane tube with a silicone tube, and conn...

Embodiment 2

[0050] Composition of ingredients into Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ The loaded membrane is tested for air tightness, and defective membrane tubes are screened out. The thickness of the dense layer of the supporting film is 7 μm, and the thickness of the carrier layer is 0.5 mm.

[0051] (1) According to formula Ba 0.33 Sr 0.33 Ca 0.33 co 0.8 Fe 0.2 o 3-δ Among them, take each raw material according to the ratio of the above formula: BaCO 3 , SrCO 3 , CaCO 3 、Co 3 o 4 , Fe 2 o 3 Mix, add ethanol and carry out ball milling for 3 hours to obtain powder I, dry and sinter. Take out part of powder I and add ethanol to ball mill for 50h, then centrifuge at 15000r / min for 15min to obtain powder II and dry it. Mix powder I (particle size 1-10 μm) and powder II (particle size 100-1000 nm) at a mass ratio of 1:2 as a restoration material.

[0052] (2) Disperse the above restoration materials in ethanol at a mass concentration of 1%, and disperse evenly in an ultra...

Embodiment 3

[0055] Composition of components into La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ The hollow fiber oxygen permeable membrane is tested for air tightness, and defective membrane tubes are screened out.

[0056] (1) According to formula La 0.6 Sr 0.4 co 0.2 Fe 0.5 Cu 0.3 o 3-δ Among them, take each raw material according to the ratio of the above formula: La 2 o 3 , SrCO 3 , CuO, Co 3 o 4 , Fe 2 o 3 Mix, add ethanol and carry out ball milling for 3 hours to obtain powder I, dry and sinter. Take out part of powder I and add ethanol to ball mill for 50h, then centrifuge at 15000r / min for 15min to obtain powder II and dry it. Mix powder I (particle size 1-10 μm) and powder II (particle size 100-1000 nm) at a mass ratio of 1:2.5 as a restoration material.

[0057] (2) Disperse the above restoration materials in ethanol at a mass concentration of 1%, and disperse evenly in an ultrasonic instrument. Seal one end of the defective membrane tube with a silicone tube, and connect...

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Abstract

A repairing method for defects of a ceramic oxygen-permeable membrane includes the following steps: mixing at least one of carbonates or oxides of Ca, Cu and Zn with components for preparing the ceramic oxygen-permeable membrane, performing ball milling, drying and sintering to obtain a powder I; taking the powder I, adding a solvent, and performing ball milling, centrifugal separation and dryingto obtain a powder II; mixing the powder I and the powder II in a certain proportion to form a dispersion, placing the ceramic oxygen-permeable membrane with defects into the dispersion, performing impregnating under vacuum, and performing drying and sintering. The invention provides the repairing method for defects of the ceramic oxygen-permeable membrane; with the method, the mixed conductor oxygen-permeable membrane with a perovskite structure or a fluorite-perovskite dual phase structure is repaired; a material which has a melting point lower than that of the membrane material and composition similar to that of the membrane material is used for repairing work, so that defects, produced during preparation, of the ceramic oxygen-permeable membrane are effectively repaired; and the utilization rate and finished-product rate of the oxygen-permeable membrane are improved.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a method for repairing defects of ceramic oxygen-permeable membranes. Background technique [0002] Ceramic oxygen permeable membrane is a kind of inorganic ceramic membrane with both oxygen ion conductivity and electronic conductivity. In the mixed conductor oxygen permeable membrane, oxygen ions are conducted through the oxygen hole mechanism. In order to maintain the charge balance inside the material, electrons in The reverse conduction in the oxygen-permeable membrane allows the cyclic operation of the oxygen-permeable process to be realized without an additional circuit. Conducting oxygen ions through this unique oxygen ion-hole mechanism makes the mixed conductor oxygen permeable membrane theoretically have 100% oxygen selectivity, so it is widely used in energy, environment, chemical industry and other fields. [0003] According to the structure of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5036C04B41/5045C04B41/87C04B41/5027C04B35/2633C04B35/2641
Inventor 杨维慎曹中卫朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI