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Method for sintering high-temperature-resistant bonded oxygen-permeable oxide ceramics by doping-assisted diffusion reaction

A technology of oxide ceramics and oxygen permeability, applied in chemical instruments and methods, separation methods, semi-permeable membrane separation, etc., can solve problems such as reduced oxygen permeability and increased risk of failure

Inactive Publication Date: 2016-01-20
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads on the one hand to a reduction in oxygen permeability and on the other hand to an increased risk of failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 : BSCF5582 membrane tube with hermetic one-sided closure

[0018] BSCF5582 (Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ ) of dense sintered tubes are cut in a direct manner by a diamond cutting disc on a cutting machine. A cylindrical compact tablet of the same material with a suitable diameter is planar ground on one side. The piece is placed in a bonding furnace, where ball bearings are mounted on ZrO 2board. A foil ring made of copper foil with a foil thickness of 6 μm was placed on the sheet and the membrane tube was placed on the foil. The upper end of the membrane tube was guided loosely into the perforated brick and a gravitational load of 0.5 kg was applied. It is then heated to 1000° C. at 3 K / min, held for 2 hours, and cooled at 3 K / min or at the furnace cooling rate. The closure of the membrane tube is mechanically stable and gas-tight, i.e. its He leakage rate is lower than 10 -9 millibar l / s. The connection can be thermally cycled as desired.

Embodiment 2

[0019] Example 2 : BSCFZ55622 Hermetic bonding of membrane tubes

[0020] Put two BSCFZ55622 (Ba 0.5 Sr 0.5 co 0.6 Fe 0.2 Zr 0.2 o 3-δ ) of dense sintered tubes are cut in a direct manner by a diamond cutting disc on a cutting machine. The two tubes are loosely secured in the bonding furnace by perforated bricks. Using a bonding surface with 20Ma-% Cu in terpineol 2 O's paste coverage. The joining surfaces of the two tubes were then placed against each other and a gravitational load of 0.5 kg was applied to the upper tube. It was then heated to 120° C. at 3 K / min, held for 30 minutes, then further heated to 1050° C., held for 2 hours, and cooled at 3 K / min or at the furnace cooling rate. The junction of the membrane tubes is mechanically stable and airtight, i.e. the He leakage rate is lower than 10 -9 millibar l / s. The connection can be thermally cycled as desired.

Embodiment 3

[0021] Example 3 : One-sided closure of BCFZ622 dense membrane tubes

[0022] Will be composed of BCFZ622 (BaCo 0.6 Fe 0.2 Zr 0.2 o 3-δ ) made of dense film tubes are cut in a straightforward manner by a diamond cutting disk on a cutting machine. A cylindrical compact tablet of the same material with a suitable diameter is planar ground on one side. The piece is placed in a bonding furnace, where ball bearings are mounted on ZrO 2 board. The edge area of ​​the sheet was densely coated with some CuO powder, the membrane tube was placed on it and gently rotated back and forth 2-3 times. The upper end of the membrane tube was guided loosely into the perforated brick and a gravitational load of 0.5 kg was applied. It is then heated to 1030° C. at 3 K / min, held for 2 hours, and cooled at 3 K / min or at the furnace cooling rate. The closure of the membrane tube is mechanically stable and gas-tight, i.e. its He leakage rate is below 10 -9 millibar l / s. The connection can b...

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PUM

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Abstract

The invention relates to a method for high temperature resistant bonding or bonding of oxide ceramic structural components made of mixed conducting oxide ceramics. The object of the present invention is to provide a possibility for high temperature resistant bonding of ceramic structural components made of mixed conductive substituted alkaline earth metal cobaltates, wherein in the case of dense membrane components the bonding should be gas-tight sexual. This object is achieved by a method for high-temperature resistant bonding of oxygen-permeable oxide ceramics based on substituted alkaline earth metal cobaltates by doping-assisted diffusion reaction sintering, wherein at least one bonding surface is provided with Cu-containing additives, and then heated to a temperature below the usual sintering temperature of the ceramic component up to 250K under the load of gravity or other force, and maintained at this temperature for 0.5 to 10 hours.

Description

technical field [0001] The invention relates to a method for high temperature resistant bonding or bonding of oxide ceramic structural components made of mixed conducting oxide ceramics. In this way, ceramics based on substituted alkaline earth metal cobaltates can be permanently bonded to one another in a temperature-resistant and, when using dense ceramic structural components, in a gas-tight manner, so that complex structural components can be constructed therefrom. This opens up new possibilities for structurally optimizing the membrane structure assembly, connecting gas lines, increasing the areal density of the membrane, and thus increasing the oxygen permeability with respect to the reaction volume. Background technique [0002] It is known from the prior art to bond various sintered ceramics to each other or to metals by means of brazing processes such as active brazing or reactive air brazing (RAB, WO 03 / 063186 A1). CN1550479A discloses a method for sintering a bon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02C04B37/00
CPCB01D53/228B01D69/04B01D69/08C04B35/01C04B35/62231C04B37/005C04B37/006C04B2235/3213C04B2235/3215C04B2235/3244C04B2235/3272C04B2235/3275C04B2235/522C04B2237/06C04B2237/124C04B2237/34C04B2237/76B01D2325/22B01D65/003B01D67/00411B01D71/0271B05D3/02B05D1/08C23C16/44C04B41/50
Inventor 拉尔夫·克里格尔罗伯特·基尔希爱森卡特林·里特尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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