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Composite coating material for metal surface and application thereof

A composite coating and metal surface technology, which is applied in the direction of surface coating liquid devices, coatings, conductive coatings, etc., can solve the problems of increasing the cost of connecting parts and process complexity, and achieve reduced production costs and low sintering temperatures , the effect of simple method

Active Publication Date: 2012-10-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned treatment methods all involve heating reduction of coating or powder materials, which will also increase the cost and process complexity of the connected parts

Method used

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  • Composite coating material for metal surface and application thereof
  • Composite coating material for metal surface and application thereof
  • Composite coating material for metal surface and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] figure 2 It is a schematic diagram of an embodiment of using the composite coating material of the present invention to form a protective coating on the surface of a metal part.

[0023] In this embodiment, Inconel625 plate is used as the coated substrate 1 . The metal substrate is mechanically polished step by step from 40# to 800# sandpaper. Substrates were cleaned ultrasonically in absolute ethanol before applying the coating. Before coating, the substrate is pre-oxidized at 900°C / 2h in air.

[0024] In this embodiment, the conductive composite oxide contained in the coating 3 is prepared by the sol-gel method, and the composition is La0.7Sr 0.3 CoO 3 The powder has an average particle size of about 0.5 μm. La 0.7 Sr 0.3 CoO 3 Powder, MnO 2 Co powder and Co powder are mixed in a molar ratio of 65:30:5, n-butanol and PVB are added as organic solvents and binders, the weights of which are 80% and 5% of the total weight of the solid phase powder, and the solid p...

Embodiment 2

[0027] In this embodiment, a SUS430 plate is used as the coated substrate 1 . The metal substrate was mechanically polished step by step from 40# to 800# sandpaper, and ultrasonically cleaned in absolute ethanol. Before coating, the substrate is pre-oxidized at 800°C / 24h.

[0028] In this embodiment, the conductive composite oxide contained in the coating 3 is prepared by a solid state reaction method and the composition is MnFe 2 o 4 The powder has an average particle size of about 1.3 μm. MnFe 2 o 4 Powder, Co 3 o 4 Fe powder and Fe powder are mixed at a molar ratio of 50:40:10, ethanol and PVA are added as organic solvents and binders, and their weights are 120% and 6% of the total weight of the solid phase powder, and the solid phase content is formed after ultrasonic dispersion. The slurry is 44%, and the slurry is evenly coated on the surface of the alloy substrate by dip coating. After drying, it is sintered at 800° C. for 12 hours. The thickness of the coating 3...

Embodiment 3

[0031] In this embodiment, a SUS430 plate is used as the coated substrate 1 . The metal substrate was mechanically polished step by step from 40# to 800# sandpaper, and ultrasonically cleaned in absolute ethanol.

[0032] In this embodiment, the conductive composite oxide contained in the coating 3 is prepared by a solid-state reaction method and the composition is Cu 1.3 co 1.7 o 4 powder, the average particle size of the powder is about 1.6 μm. Will Cu 1.3 co 1.7 o 4 Powder, MnO 2 The powder is mixed in a molar ratio of 80:20, and n-butanol and PVB are added as an organic solvent and a binding agent, and its weight is respectively 200% and 10% of the total weight of the solid phase powder, and after ball milling and dispersing, a solid phase content of 32% is formed. The slurry is uniformly coated on the surface of the alloy substrate by dip coating, and then sintered at 800° C. for 24 hours after drying. The thickness of the coating 3 is about 5-7 μm.

[0033] The c...

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Abstract

The invention provides a composite coating material being capable of being densified by being sintered at low temperature and used for protecting metals from being oxidized in various high-temperature devices and especially used for coating metal parts of SOFC (Solid Oxide Fuel Cells). The composite coating material contains at least two oxide components in percentage by weight: 40%-90% of conductive composite oxides (component A) and 10%-60% of single oxides of transition metals (component B); and besides, the composite coating material also contains 0.01%-10% of the transition metals (component C). In the invention, the composite coating material is mixed with a solvent, an organic adhesive and other additives, then slurry is coated on the metal parts through methods, such as brush coating, spray coating, dip coating, and the like, and the metal parts are dried and then sintered at the low temperature of 700-900 DEG C to form a protective coating. The preparation method has the advantages of simple process, low sintering temperature, easy industrial production, and the like; and the formed protective coating has good conductive property, high temperature stability and oxidation resistance and high combinability with a metal base body and can effectively prevent the Cr from dispersing out of the metal parts.

Description

technical field [0001] The invention relates to a composite coating material which can be sintered and compacted at a relatively low temperature, which is used for protecting metals from oxidation in various high-temperature devices, and is especially used for the coating of metal parts of solid oxide fuel cells. Background technique [0002] A solid oxide fuel cell (SOFC) is a power generation device that directly converts chemical energy in fuel into electrical energy in a clean and efficient manner. In order to obtain the required voltage and power, the SOFC power generation system usually contains more than one fuel cell unit, and the fuel cell units are separated by connecting components, and the connecting component also serves as an electrical connection between each fuel cell unit. [0003] Since metal materials have the advantages of low price and easy machining, the use of metal connection parts in SOFC cell stacks to replace traditional ceramic connection parts is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/24B05D7/14B05D7/24H01M2/26
CPCY02E60/12Y02E60/10
Inventor 区定容程谟杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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