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Preparation method of duplex ceramic oxygen-permeable membrane repair material

A technology for repairing materials and oxygen-permeable membranes, 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., and achieve the effect of improving utilization efficiency and yield

Active Publication Date: 2021-01-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 repair material for repairing the dual-phase ceramic oxygen-permeable membrane, which can effectively repair the ceramic oxygen-permeable membrane and improve the effective utilization rate and yield of the ceramic membrane material

Method used

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  • Preparation method of duplex ceramic oxygen-permeable membrane repair material

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[0014] The technical purpose of the present invention is to provide the preparation method of dual-phase ceramic oxygen-permeable membrane restoration material, comprising the following steps: at least one of carbonates or oxides of Ca, Cu and Zn and the prepared dual-phase ceramic oxygen-permeable membrane Mix the components, add solvent for ball milling, dry the mixed powder and sinter to obtain powder I, take part of powder I and add solvent ball mill again, centrifuge and dry to obtain powder II; powder I and powder II is mixed at a mass ratio of 1:(0.5-10) to obtain the repair material.

[0015] In a specific embodiment, the dual-phase ceramic oxygen-permeable membrane is a mixed-conductor oxygen-permeable membrane having a fluorite structure-perovskite structure, which has the structure and composition shown in the following expression:

[0016] Ce 1-z SM z o 2-δ -Sm 1-x Sr x al 1-y Fe y o 3-δ (0﹤x≤0.5, 0﹤y﹤1, 0﹤z≤0.5),

[0017] Ce 1-y SM y o 2-δ -Sm 1-x Sr ...

Embodiment 1

[0029] 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.

[0030] Preparation of restoration materials: according to the 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.

[0031] Membrane material repair: The above repair materials are dispersed in ethanol at a mass concentration of 1%, and dispersed evenly in an ultrasonic instrument. Seal one end ...

Embodiment 2

[0034] 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.

[0035] Preparation of restoration materials: according to the 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.

[0036] Membrane material repair: The above repair materials are dispersed in ethanol at...

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Abstract

A preparation method of a dual-phase ceramic oxygen-permeable membrane repairing material includes the steps of: mixing at least one of carbonates or oxides of Ca, Cu and Zn with components for preparing a dual-phase ceramic oxygen-permeable membrane, adding a solvent, performing ball milling, and drying and sintering the mixed powder to obtain a powder I; getting a part of the powder I, adding asolvent, and then performing ball milling, centrifugal separation and drying to obtain a powder II; and mixing the powder I and the powder II to obtain the repairing material. The dual-phase ceramic oxygen-permeable membrane repairing material is prepared by the preparation method of the invention, also the invention discloses a method for performing membrane repairing by using the repairing material. 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 duringpreparation, of the dual-phase ceramic oxygen-permeable membrane can be effectively repaired, and thus the utilization rate and finished-product rate of the oxygen-permeable membrane are improved.

Description

technical field [0001] The invention belongs to functional ceramic materials, in particular to a dual-phase ceramic oxygen-permeable membrane repair material. 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 the membrane, ceramic oxygen p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/626C04B41/87C04B35/622
CPCC04B35/2633C04B35/622C04B35/626C04B41/5036C04B41/87C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3275
Inventor 杨维慎曹中卫朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI