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Preparation method and application of manganese-cobalt spinel coating

A spinel coating, manganese-cobalt technology, applied in the coating, metal material coating process, fuel cell components and other directions, can solve problems affecting the long-term stability of SOFC stack, SOFC stack performance degradation, reducing battery Power generation efficiency and other issues, to achieve the effect of good conductivity, easy operation, uniform and dense texture

Pending Publication Date: 2022-04-12
SHENHUA NEW ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After long-term high-temperature treatment, a layer of Cr with poor conductivity will be formed on the surface of ferritic stainless steel. 2 o 3 , increase the internal resistance of the battery and reduce the power generation efficiency of the battery
Cr 2 o 3 Gaseous CrO formed by reaction with water vapor 2 (OH) 2 It will enter the cathode at high temperature and form low-activity chromium-containing compounds with the cathode material, which will cause a sharp decline in the performance of the SOFC stack and seriously affect the long-term stability of the SOFC stack

Method used

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  • Preparation method and application of manganese-cobalt spinel coating
  • Preparation method and application of manganese-cobalt spinel coating
  • Preparation method and application of manganese-cobalt spinel coating

Examples

Experimental program
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Embodiment 1

[0050] The present embodiment provides a kind of preparation method of manganese-cobalt spinel coating, and described preparation method comprises the following steps:

[0051] S1: Cut a flat ferritic stainless steel plate of appropriate size as the connecting body, and polish and polish the front and back sides of the steel plate with 240, 800, and 2000-mesh sandpaper on a polishing machine until the surface roughness of the steel plate is <0.3 μm; then The polished steel plates were ultrasonically cleaned in deionized water and absolute ethanol for 10 minutes to remove surface impurities and left to dry to obtain a processed ferritic stainless steel joint;

[0052] S2: Mix manganese powder and cobalt powder at a mass ratio of 1:3, then add to ethanol twice the mass of the mixed powder and mix to obtain a manganese-cobalt suspension; then put the manganese-cobalt suspension in a ball mill at 220rmp / Ball mill at a rate of 24 hours to prepare a suspension of manganese-cobalt p...

Embodiment 2

[0060] In step S2 in Example 1: mix manganese powder and cobalt powder at a mass ratio of 1:3, change manganese powder and cobalt powder to mix at a mass ratio of 1:1; the rest are the same as in Example 1.

[0061] The manganese-cobalt spinel coating thickness that embodiment 2 obtains is 30 μ m, and the main component of manganese-cobalt spinel is Mn 2 CoO 4 .

Embodiment 3

[0063] In step S2 in Example 1: Manganese powder and cobalt powder are mixed at a mass ratio of 1:3, and manganese powder and cobalt powder are mixed at a mass ratio of 1:6; the rest are the same as in Example 1.

[0064] The manganese-cobalt spinel coating thickness that embodiment 3 obtains is 30 μm, and the main component of manganese-cobalt spinel is MnCo 2 o 4 .

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Abstract

The invention provides a preparation method and application of a manganese-cobalt spinel coating. The method comprises the following steps: placing a to-be-sprayed substrate and a manganese-cobalt target material in a vacuum oxygen-free environment, heating the manganese-cobalt target material by using a high-temperature electric arc, gasifying the manganese-cobalt target material, and filling the whole cavity with manganese-cobalt steam; keeping the sample at a low temperature such as 300 DEG C, and desublimating the manganese-cobalt steam on the surface of the to-be-sprayed substrate to form a manganese-cobalt metal pre-coating layer; and then oxidizing the to-be-sprayed substrate with the manganese-cobalt metal pre-coating on the surface in high-temperature air to obtain the manganese-cobalt spinel coating. The obtained manganese-cobalt spinel coating is uniform and compact in texture and good in electrical conductivity at the high temperature, the surface specific resistance of the coating can reach 10 m omega.cm < 2 > or below, the coating has good stability, and no obvious resistance rise exists within the range of 500 hours; the material can be widely applied to solid oxide fuel cells.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a preparation method and application of a manganese-cobalt spinel coating. Background technique [0002] Fossil energy occupies a dominant position in my country's energy structure and energy consumption, and has become a key issue affecting my country's energy security and ecological environment. Therefore, seeking and developing efficient and clean new energy is crucial to improving the energy structure, promoting green and low-carbon development, and accelerating environmental protection. Governance is of great significance to promote the diversification of energy sources. [0003] A fuel cell is an electrochemical device that directly converts the chemical energy of fuel into electrical energy through electrode reactions. It is a new generation of power generation technology after water conservancy, thermal power and nuclear energy. It has high energy conversion eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/14C23C14/58C22C19/07C22C1/02H01M8/021H01M8/0228
CPCY02E60/50
Inventor 刘长磊金奕千靳现林王巍张晓宇由晓彬刘大为许潇涵
Owner SHENHUA NEW ENERGY CO LTD
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