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Preparation method and application of manganese-cobalt spinel coating

A spinel coating and manganese-cobalt technology, which is applied to the preparation field of manganese-cobalt spinel coating, can solve the problems of poor conductivity, low activity, increased internal resistance of batteries, etc., and achieves uniform and dense texture, simple preparation process, Economical effect

Active Publication Date: 2022-01-25
CHINA UNIV OF MINING & TECH (BEIJING)
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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

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preparation example Construction

[0048] According to one aspect of the present invention, a kind of preparation method of manganese-cobalt spinel coating, described preparation method comprises the following steps:

[0049] (a), providing manganese-cobalt mixed powder, then mixing the manganese-cobalt mixed powder with the solution to obtain a mixed slurry;

[0050] (b), the mixed slurry is coated on the surface of the ferritic stainless steel connecting body, dried, and an intermediate coating A is obtained on the surface of the ferritic stainless steel connecting body;

[0051] (c) Sintering the ferritic stainless steel connection body with the intermediate coating A on the surface in a reducing atmosphere, and then passing air into it to oxidize at a high temperature to obtain a manganese-cobalt spinel coating.

[0052] The preparation method of the manganese-cobalt spinel coating provided by the present invention, the preparation method first mixes the manganese-cobalt mixed powder with the solution to ob...

Embodiment 1

[0107] A kind of preparation method of manganese-cobalt spinel coating, described preparation method comprises the following steps:

[0108] (1) Cut a flat ferritic stainless steel plate of appropriate size as a connecting body, and use 240, 800, and 2000 mesh sandpaper to polish and polish the front and back sides of the steel plate on a polishing machine until the surface roughness of the steel plate is <0.3 μm; Subsequently, the polished steel plates were ultrasonically cleaned in deionized water and absolute ethanol for 10 min to remove surface impurities and left to dry to obtain ferritic stainless steel joints;

[0109] (2), mix manganese powder and cobalt powder with a mass ratio of 1.5:1.5, then add 2 times the mass of mixed powder in ethanol and mix to obtain a manganese-cobalt suspension; then mix the manganese-cobalt suspension in a ball mill Ball mill at a rate of not less than 180 rpm for more than 24 hours to prepare a suspension of manganese-cobalt powder that i...

Embodiment 2

[0119] A kind of preparation method of manganese-cobalt spinel coating, described preparation method comprises the following steps:

[0120] (1), with embodiment 1;

[0121] (2), mix manganese powder and cobalt powder with a mass ratio of 1.5:1.5, then add 2 times the mass of mixed powder in ethanol and mix to obtain a manganese-cobalt suspension; then mix the manganese-cobalt suspension in a ball mill Ball mill at a rate of not less than 100 rpm for more than 10 hours to prepare a uniformly mixed suspension of manganese-cobalt powder with a particle size of less than 2 microns. After the ball milling is completed, take out the suspension and place it at 40°C for 48 Hours of evaporation to remove the ethanol in the suspension to obtain dried and mixed manganese-cobalt mixed powder;

[0122] (3) Compound ethyl cellulose and terpineol at a mass ratio of 2:98 to obtain solution A; then mix the manganese-cobalt mixed powder in step (2) with solution A at a mass ratio of 1:1 , to o...

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Abstract

The invention provides a preparation method and application of a manganese-cobalt spinel coating, and relates to the technical field of coating materials. The preparation method of the manganese-cobalt spinel coating firstly mixes the manganese-cobalt mixed powder with the solution to obtain a mixed slurry; then applies the mixed slurry to the surface of a ferritic stainless steel connector and dries to obtain an intermediate coating A; Then sinter the ferritic stainless steel connecting body with the intermediate coating A on the surface under a reducing atmosphere, and then pass it into air to oxidize at a high temperature to obtain a manganese-cobalt spinel coating. The above preparation method has the advantages of simple preparation process, easy operation and strong economy, and can generate a spinel coating with uniform and dense texture. It has been verified by experiments that the manganese-cobalt spinel coating prepared by the above preparation method has good electrical conductivity at high temperature, and its surface specific resistance can reach 10mΩ·cm 2 At the same time, the coating has good stability, and there is no obvious resistance increase in the range of 500 hours.

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 Patents(China)
IPC IPC(8): C23C24/08H01M8/12
CPCC23C24/082H01M8/10H01M2008/1293Y02E60/50
Inventor 金奕千彭苏萍杨志宾盛佳琦郝国政
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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