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Method for preparing perovskite coating of metallic interconnector by cold spraying and product prepared by same

A metal connector and perovskite technology, which is applied in the field of metal connector perovskite coating prepared by cold spraying, can solve the problems that hinder the development and commercialization of SOFC technology, the coating is difficult to sinter completely, and the product quality is affected. Achieve the effect of low production cost, broad market space, and low requirements for production equipment

Inactive Publication Date: 2015-01-28
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cold spraying process also has serious deficiencies. For example, the sintering temperature of perovskite ceramics is generally around 1200°C, while the resistance temperature of commonly used metal connector substrates is usually below 1000°C, but SUS430 stainless steel is at 950°C. softening deformation
Restricted by the tolerance temperature of the substrate, the sintering temperature of the metal connector perovskite coating prepared by the cold spraying method is much lower than its sintering temperature, which makes it difficult to completely sinter the coating, which seriously affects the product quality and hinders the development of SOFC technology. Further development and commercialization process

Method used

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  • Method for preparing perovskite coating of metallic interconnector by cold spraying and product prepared by same
  • Method for preparing perovskite coating of metallic interconnector by cold spraying and product prepared by same
  • Method for preparing perovskite coating of metallic interconnector by cold spraying and product prepared by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Metal substrate treatment: take a ferritic stainless steel plate with a thickness of 1mm, and wire cut it into a sample with a size of 25mm×25mm. Use 200~1500 on the surface of the metal substrate # Sandpaper was polished step by step, and soaked in citric acid solution for 20 minutes to improve its surface activity, then ultrasonically cleaned in alcohol for 15 minutes, and dried for later use;

[0026] 2) Preparation of LSM-Zn cold spray slurry: nanoscale La 0.8 Sr 0.2 MnO 3 Powder, micron-sized metal Zn powder (purity 99.9%), and terpineol are mixed. The mixing ratio is: the mass ratio of LSM powder to Zn powder is 9:1, and the volume ratio of powder to terpineol is 1. :1. The above raw materials are ball milled on a planetary ball mill, the ball milling speed is 200r / min, and the ball milling time is 24h;

[0027] 3) Preparation process of LSM coating:

[0028] Spray the above-mentioned LSM-Zn slurry on the surface of the pretreated metal connector sample a...

Embodiment 2

[0030] 1) Metal substrate treatment: take a ferritic stainless steel plate with a thickness of 1mm, and wire cut it into a sample with a size of 25mm×25mm. Use 200~1500 on the surface of the metal substrate # The sandpaper was polished step by step, soaked in citric acid solution for 20 minutes to improve its surface activity, then ultrasonically cleaned in alcohol for 15 minutes, and dried for later use.

[0031] 2) Preparation of LSM-Zn cold spray slurry: nanoscale La 0.8 Sr 0.2 MnO 3 Powder, micron metal Zn powder (purity 99.9%), terpineol for mixing. The mixing ratio is: the mass ratio of LSM powder to Zn powder is 7:1, and the volume ratio of powder to terpineol is 1:1.5. The above-mentioned raw materials were ball-milled on a planetary ball mill, the ball milling speed was 300r / min, and the ball milling time was 16h.

[0032] 3) Preparation process of LSM coating:

[0033] Spray the above-mentioned LSM-Zn slurry on the surface of the pretreated metal connector samp...

Embodiment 3

[0035] 1) Metal substrate treatment: take a ferritic stainless steel plate with a thickness of 1mm, and wire cut it into a sample with a size of 25mm×25mm. Use 200~1500 on the surface of the metal substrate # The sandpaper was polished step by step, soaked in citric acid solution for 20 minutes to improve its surface activity, then ultrasonically cleaned in alcohol for 15 minutes, and dried for later use.

[0036] 2) Preparation of LSM-Zn cold spray slurry: nanoscale La 0.8 Sr 0.2 MnO 3 Powder, micron metal Zn powder (purity 99.9%), terpineol for mixing. The mixing ratio is: the mass ratio of LSM powder to Zn powder is 6:1, and the volume ratio of powder to terpineol is 1:2. The above-mentioned raw materials were ball milled on a planetary ball mill at a ball milling speed of 400 r / min and a ball milling time of 8 hours.

[0037] 3) Preparation process of LSM coating:

[0038] Spray the above-mentioned LSM-Zn slurry on the surface of the pretreated metal connector sample...

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Abstract

The invention discloses a method for preparing a perovskite coating of a metallic interconnector by cold spraying and a product prepared by the same. The fluxing function of a single-substance metal is utilized; the compact LSM (Large Stone Asphalt Mixture) perovskite ceramic protection coating is prepared on the surface of the SOFC (Solid Oxide Fuel Cell ) metallic interconnector by a cold spraying process; the method adopts the simple process, is low in cost, has low requirements for equipment and is suitable for batch production; by regulating process parameters such as solid content of slurry, a spraying distance, spraying air pressure and spraying time, the LSM perovskite coatings with different thicknesses can be obtained; the prepared coating is compact and stable, has good high-temperature conductivity and excellent mechanical performance and heat shock resistance, effectively improves high-temperature inoxidizability of the metallic interconnector and inhibits diffusion and volatilization of the Cr element and meets the application protection requirement of the SOFC metallic interconnector, and thus, the method and the product prepared by the same have a wide application market.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a method for preparing a perovskite coating on a metal connector by cold spraying and a product thereof. Background technique [0002] Solid oxide fuel cell (SOFC) can directly convert the chemical energy of fuel into electrical energy. It is an environmentally friendly and efficient energy utilization device and is considered to be one of the effective ways to solve the energy crisis. Connector is a key component in Solid Oxide Fuel Cell (SOFC), which plays the role of collecting current, electrical connection, blocking fuel gas and oxidizing gas, and distributing gas flow. It works in a high temperature environment and has to withstand strong thermal cycle shocks, direct contact with multiple other battery stack components and different atmospheres, which affects its thermal expansion performance, thermal stability, chemical stability, electronic conductivity...

Claims

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Application Information

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IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 徐序罗凌虹
Owner JINGDEZHEN CERAMIC INSTITUTE
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