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Preparation technology of antioxidant and conductive spinel coating

A spinel coating and preparation process technology, applied in metal material coating process, coating and other directions, can solve the problems of difficult to control the thickness of continuous layers, inability to precisely control the coating, difficult to precisely control the alloy layer, etc. The effect of meeting the protection needs, broadening the application range and preventing the volatilization of Cr

Active Publication Date: 2013-07-03
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this experimental method is difficult to realize co-deposition of CoMn, and this method is not easy to control the thickness of the continuous layer of each element, and it is difficult to accurately control the Co / Mn ratio in the alloy layer, and it is impossible to accurately control the complete coating after thermal oxidation. Converted to CoMn spinel

Method used

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  • Preparation technology of antioxidant and conductive spinel coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1): The preparation process of the spin deposition electrode: Weigh 25.88g of Co metal (purity greater than 99.9wt.%) and 24.12g of manganese metal (purity: greater than 99.9wt.%), mix and smelt it into a 50g metal ingot, and then The metal ingot was placed in a tube furnace for vacuum annealing at a temperature of 900°C for 60 hours, so that the internal structure of the alloy was homogenized, and the atomic ratio of Co:Mn in the alloy was 1:1. Then make it into a round rod with a diameter of about 4mm, clean it with ultrasonic-assisted degreasing in acetone solution for 3-5min, then rinse it with deionized water, and dry it for later use.

[0024] 2): The pretreatment process of the deposited metal sample: use 400-1200 # Grind the sample step by step with a suitable sandpaper, put the sample in an acetone solution for ultrasonic-assisted degreasing and cleaning for 3 to 5 minutes, then rinse with deionized water, and dry it for later use.

[0025] 3): The preparation...

Embodiment 2

[0027] 1): The preparation process of the spin deposition electrode: Weigh 40.55g of Co metal (purity greater than 99.9wt.%) and 9.45g of manganese metal (purity: greater than 99.9wt.%), mix them evenly and then smelt them, and then smelt the smelted metals The ingot was put into a tube furnace for vacuum annealing, the annealing temperature was 1100°C, and the time was 40h, so that the internal structure of the alloy was homogenized, and the Co:Mn atomic ratio of the alloy was 4:1. Then make it into a round rod with a diameter of about 2mm, clean it with ultrasonic-assisted degreasing in acetone solution for 3-5min, then rinse it with deionized water, and dry it for later use.

[0028] 2): The pretreatment process of the deposited metal sample: use 400-1200 # Grind the sample step by step with a suitable sandpaper, put the sample in an acetone solution for ultrasonic-assisted degreasing and cleaning for 3 to 5 minutes, then rinse with deionized water, and dry it for later use...

Embodiment 3

[0031] 1): The preparation process of the spin deposition electrode: Weigh 25.88g of Co metal (purity greater than 99.9wt.%) and 24.12g of manganese metal (purity: greater than 99.9wt.%), mix them evenly and then smelt them, and then smelt the smelted metals The ingot was placed in a tube furnace for vacuum annealing at a temperature of 1100°C for 60 hours, so that the internal structure of the alloy was homogenized, and the atomic ratio of Co:Mn in the alloy was 1:1. Then make it into a round rod with a diameter of about 2mm, clean it with ultrasonic-assisted degreasing in acetone solution for 3-5min, then rinse it with deionized water, and dry it for later use.

[0032] 2): The pretreatment process of the deposited metal sample: use 400-1200 # Grind the sample step by step with a suitable sandpaper, put the sample in an acetone solution for ultrasonic-assisted degreasing and cleaning for 3 to 5 minutes, then rinse with deionized water, and dry it for later use.

[0033]3): ...

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Abstract

The invention relates to the field of metal surface modification and provides a preparation technology of an antioxidant and conductive spinel coating. The method comprises the follow steps: smelting after Co metal powder and Mn metal powder are uniformly mixed, then carrying out annealing to well smelt CoMn alloy, and cleaning up the well smelt CoMn alloy treated through annealing as deposit electrode material for reservation; taking a prepared deposit electrode as a cathode in the process of sedimentation, taking metal as the material of a basal body, under the protection of inert gas, and carrying out electro- spark deposition on the surface of the metal, that is a CoMn alloy coating layer is produced; and carrying out heating and pre-oxidation on the prepared CoMn alloy coating layer in air atmosphere, that is a CoMn spinel coating is formed on the surface of the CoMn alloy coating layer. According to the invention, alloy atomic ratio can be accurately controlled, the conducting material of the electrode is oozed into the surface of a metal piece to form the alloy layer, the prepared coating and the basal body have the characteristic of metallurgical bonding, the bonding force is strong, and the coating forms a spinel which meets the protecting requirements of an SOFC (Solid Oxide Fuel Cell) metallic union body.

Description

technical field [0001] The invention relates to the field of metal surface modification, especially the surface protection technology of metal connectors in SOFC. Background technique [0002] Lanthanum chromate is generally selected as the connector material of traditional solid oxide fuel cells (SOFC), but its preparation process is complex and expensive, which limits the commercial application of SOFC. With the development of medium temperature in SOFC, it becomes possible to use metal as a connector material. However, the special working environment of SOFC imposes strict restrictions on the selection of metal materials, because metal connectors have problems such as insufficient oxidation resistance and chromium volatilization during long-term service, which eventually lead to a sharp decline in the performance of the battery stack. To a large extent, it hinders the commercial operation of solid oxide fuel cells. [0003] In order to solve this critical problem, a sim...

Claims

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Application Information

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IPC IPC(8): C23C26/02
Inventor 潘太军李杰张保汪涛贺云翔
Owner HUAWEI TEHCHNOLOGIES CO LTD
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