High-temperature alloy protecting coating and method of preparing the same

A protective coating and high-temperature alloy technology, which is applied in the field of metal and enamel composite coatings and high-temperature alloy protective coatings, can solve the problems of restricting the practical application of coatings and reducing the thermal shock life of coatings, and achieve high-temperature oxidation resistance and high-temperature protection. The effect of hot corrosion ability, excellent thermal shock performance and excellent high temperature corrosion resistance

Inactive Publication Date: 2008-01-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent brittleness of this type of oxide coating, the thermal shock life of the coating is seriously reduced, which restricts the practical application of this type of coating.

Method used

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  • High-temperature alloy protecting coating and method of preparing the same
  • High-temperature alloy protecting coating and method of preparing the same
  • High-temperature alloy protecting coating and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Apply metal and enamel composite coating thermal shock experiment on the K38G superalloy with bonding layer

[0025] Sample cast K38G. The size is 15mm×10mm×3mm. Spray 60% (weight percentage) of MCrAlY-enamel composite powder with a particle size distribution of 0.1-15 μm on the sample with the bonding layer. The composition of MCrAlY is Ni-25Co-20Cr-8Al-4Ta-0.6Y (weight percent). The softening point of enamel is about 850°C, and the coefficient of thermal expansion is 10.0×10 -6 K -1 . A metal-enamel composite coating with a thickness of 20 μm was prepared by sintering at 1000° C. for 30 minutes. After 100 thermal shock tests at 1000°C, the coating did not peel off significantly, showing excellent thermal shock performance (see Figures 4 and 5).

Embodiment 2

[0028] Embodiment 2: Apply metal-enamel composite coating high-temperature oxidation experiment on the K38G superalloy with bonding layer

[0029] Sample cast K38G. The size is 15mm×10mm×3mm. Spray 60% (weight percentage) of MCrAlY-enamel composite powder with a particle size distribution of 0.1-15 μm on the sample with the bonding layer. The composition of MCrAlY is Ni-25Co-20Cr-8Al-4Ta-0.6Y (weight percent). The softening point of enamel is about 850°C, and the coefficient of thermal expansion is 10.0×10 -6 K -1 . Sinter at 1000°C for 30 minutes to prepare a metal-enamel composite coating with a thickness of 20 μm. Oxidation at 1000°C, the weight gain of the coating is smaller than that of the MCrAlY coating prepared by arc ion plating (see Figure 6), and the coating remains intact after oxidation for 100 hours (see Figure 8), which significantly improves the high temperature oxidation performance of the substrate.

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Abstract

A protection coating for a hi-temp alloy is characterized in that, the coating is a compound coating of metal and enamel formed by spreading some metallic powder on an enamel substrate. Wherein, the metallic powder is MCrAlY powder of high thermal expansion rate coefficient and good resistance to hi-temp corrosion, M is one from Ni, Co, NiCo or any combination of them. Way for preparing the protection coating for hi-temp alloy is: first of all the metallic powder is fully mixed with the enamel powder, then the mixed powder is sprayed on the surface of a specimen, still then a metal-enamel compound coating spread on the enamel substrate is formed by high temperature sintering. The metal-enamel compound coating prepared by the invention is not only furnished with excellent resistance to hi-temp corrosion, but also highly improved thermal expansion rate coefficient because of the addition of plastic metallic powder, and greatly improved thermal vibration property.

Description

Technical field: [0001] The invention relates to the high-temperature protection technology of metals, and in particular provides a method for improving the high-temperature protection performance of superalloys and a high-temperature alloy protective coating by preparing a new type of metal-enamel composite coating by dispersing metal powder in an enamel matrix. Background technique: [0002] In the prior art, the advanced structural design and blade cooling technology, the development of high-performance superalloys and coating protection systems have all improved the efficiency and power of aeroengines by increasing the gas turbine inlet temperature. Generally, in addition to providing excellent high temperature oxidation and corrosion resistance, high temperature protective coatings also require long-term structural and chemical stability and good bonding with the substrate. Traditional high-temperature protective coatings include diffusion coatings (such as aluminized c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23D5/00C03C8/18
Inventor 朱圣龙王福会郑德有谢冬柏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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