Preparation method of rare earth modified spinel coating

A technology of spinel coating and rare earth modification, which is applied in the coating, metal material coating process, etc., and can solve the problem of weak spinel coating/metal interface bonding, differences in thermal expansion coefficient, and low coating density and other problems, to achieve the effect of solving the weak bonding force of the coating, improving high temperature corrosion resistance and electrical conductivity, and broadening the application range

Active Publication Date: 2014-04-02
南通东湖国际商务服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Solve the problems of weak spinel coating / metal interface, easy peeling, low coating density, and difference in thermal expansion coefficient; (2) Provide High-quality Co-Mn spinel and LaCoO3 composite oxide coating ensures that the coating has good high temperature oxidation resistance and electrical conductivity

Method used

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  • Preparation method of rare earth modified spinel coating

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Experimental program
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Effect test

Embodiment 1

[0027] 1): The preparation process of the spin deposition electrode: Weigh 0.83g of Co metal powder (purity greater than 99.9wt.%), MnO 2 Powder (purity: greater than 99.9wt.%) 0.31g, La 2 o 3 Powder 1.15g, after mixing evenly, the electrode sheet was prepared by hot pressing sintering method, the pressure was 4MPa, the holding time was 60s, the sintering condition was vacuum, the vacuum degree was -0.1MPa, the sintering temperature was 1200 ° C, and the time was 4h.

Embodiment 2

[0030] 1): The preparation process of the spin deposition electrode: Weigh 0.83g of Co metal powder (purity greater than 99.9wt.%), MnO 2 Powder (purity: greater than 99.9wt.%) 0.31g, La 2 o 3 Powder 1.15g, after mixing evenly, the electrode sheet was prepared by hot pressing sintering method, the pressure was 5MPa, the holding time was 30s, the sintering condition was vacuum, the vacuum degree was -0.1MPa, the sintering temperature was 1400 ° C, and the time was 2h.

[0031] 2): The preparation process of rare earth modified spinel coating: high-energy micro-arc alloying equipment is used to deposit on the surface of the surface-treated stainless steel sample, and appropriate process parameters are selected. The voltage is 80V, the frequency is 600Hz, the pulse width is 200μs, the power is 3000W, 10L / min of argon is used as the protective gas, the deposition electrode is kept at a fixed speed of 4500r / min, and it can be deposited on the surface of the deposited metal within ...

Embodiment 3

[0033] 1): The preparation process of the spin deposition electrode: Weigh 1.21g of Co metal powder (purity greater than 99.9wt.%), MnO 2 Powder (purity: greater than 99.9wt.%) 0.59g, La 2 o 3 The powder is 0.56g, and after mixing evenly, the electrode sheet is prepared by hot pressing sintering method, the pressure is 4MPa, the holding time is 60s, the sintering condition is vacuum, the vacuum degree is -0.1MPa, the sintering temperature is 1200 ° C, and the time is 4h.

[0034] 2): The preparation process of rare earth modified spinel coating: high-energy micro-arc alloying equipment is used to deposit on the surface of the surface-treated stainless steel sample, and appropriate process parameters are selected. The voltage is 60V, the frequency is 400Hz, the pulse width is 400μs, and the power is 1500W. The argon gas of 10L / min is used as the protective gas, and the deposition electrode is kept at a fixed speed of 3000r / min. After 8 minutes of deposition, it can be prepared...

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Abstract

The invention belongs to the field of metal surface modification, and particularly relates to a preparation method of a rare earth modified spinel coating. The preparation method specifically comprises the following steps: uniformly mixing cobalt powder, manganese dioxide powder and lanthanum oxide powder in proportion; preparing an electrode material by adopting a hot-pressing sintering method; then, depositing the electrode material on the surface of stainless steel by adopting a high-energy micro-arc alloying method under inert gas shielding to prepare a cobalt-based compound oxide coating which has good conductivity; and further placing the coating in an air or oxygen environment to heat and preoxidize to prepare a cobalt manganese spinel and lanthanum cobaltate compounded oxide coating. The cobalt manganese spinel and lanthanum cobaltate compounded oxide coating prepared by the process has good high temperature antioxidant and conductive performances, overcomes the problem that the prior spinel coating and metal interfaces are insecure to bind, and the coating is low in compactness and different in coefficient of thermal expansion and the like, and can satisfy the demands of anti-oxidation, conductivity, anti-Cr volatilization and the like on a ferritic stainless steel connector.

Description

technical field [0001] The invention relates to the field of metal surface modification, in particular to the surface protection technology of metal connectors in SOFC, in particular to a preparation method of a rare earth modified spinel coating. Background technique [0002] Recent studies have found that the operating temperature of solid oxide fuel cells (SOFCs) can be reduced to 600-800°C by reducing the thickness of the electrolyte membrane or adopting an electrolyte membrane with high oxygen ion conductivity, which makes the metal as a link materials made possible. [0003] At present, in intermediate temperature solid oxide fuel cells, due to the problems of insufficient oxidation resistance, chromium volatilization, and cathode poisoning of the ferritic stainless steel connectors during the long-term service of SOFC, the performance of the battery stack will eventually decline sharply. The commercial operation of solid oxide fuel cells has been hindered to a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00B22F1/00B22F3/16
Inventor 潘太军张飞飞张保贺云翔
Owner 南通东湖国际商务服务有限公司
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