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High temperature alloy protective technology

A high-temperature alloy and technology technology, applied in the field of material science, can solve the problems of dense oxide coating, large difference in linear expansion coefficient, easy cracking, etc., to achieve the effect of improving high temperature performance, reducing alloy corrosion rate, and isolating corrosive media

Inactive Publication Date: 2006-11-08
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, oxide coatings are difficult to prepare very dense
At the same time, due to the large difference in linear expansion coefficient between the oxide and the base alloy, the oxide coating directly prepared on the alloy surface is easy to crack under temperature cycle conditions.

Method used

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  • High temperature alloy protective technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 applies bonding layer and composite oxide coating on K38G superalloy

[0036] When the K38G superalloy is oxidized, Cr 2 o 3 The main mixed oxide film has poor oxidation resistance above 1000 °C. A bonding layer (2) with the same composition as the K38G superalloy substrate was fabricated on the sample substrate (1) by a sputtering method, with a thickness of 4 μm.

[0037] Prepare raw materials to be reacted according to the following ratio: Al 2 o 3 : 30% by weight; Y 2 o 3 : 3% by weight; enamel powder: balance. Wherein, the composition of enamel powder is according to weight percent: ZrO 2 : 5%, Al 2 o 3 : 6%; ZnO: 9%; CaO: 4%; B 2 o 3 : 4%; Na 2 O: 4%; K 2 O: 6%; TiO 2 : 2%; SiO 2 :margin. Mix the above raw materials into anhydrous ethanol and wet ball mill to make a suspension, then spray on the surface of the bonding layer (2) to a thickness of 20 μm; finally sinter at 1000°C for 15 minutes, and air cool to room temperature to make a ...

Embodiment 2

[0038] Embodiment 2 Apply bonding layer and composite oxide coating on IN738 superalloy

[0039] When IN738 superalloy is oxidized, Cr 2 o 3 The main mixed oxide film has poor oxidation resistance above 1000 °C. A bonding layer (2) with the same composition as the IN738 superalloy substrate was fabricated on the sample substrate (1) by an arc ion plating method, with a thickness of 4 μm.

[0040] Raw materials are prepared according to the following ratio: MgO: 25% by weight; Y 2 o 3 : 3% by weight; enamel powder: balance. Wherein, each composition composition of enamel powder is according to weight percent: ZrO 2 : 5%; Al 2 o 3 : 6%; ZnO: 9%; CaO: 4%; B 2 o 3 : 4%; Na 2 O: 4%; K 2 O: 6%; TiO 2 : 2%; SiO 2 :margin. Mix the above raw materials into anhydrous ethanol and wet ball mill to form a suspension, then spray on the surface of the bonding layer (2) to a thickness of 20 μm; finally sinter at 1000°C for 15 minutes, and air cool to room temperature to form a c...

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Abstract

The high temperature alloy protecting technology includes the first forming binding layer in the same components as the substrate on the surface of the high temperature alloy substrate and the subsequent baking composite oxide coating on the surface. The composite oxide coating consists of basic enamel material and added Al2O3 or MgO in 10-40 wt% and Y2O3 in 1-5 wt%; and the basic enamel material consists of ZrO2 3-6 wt%, Al2O3 3-6 wt%, ZnO 8-12 wt%, CaO 3-6 wt%, B2O3 3-6 wt%, Na2O 3-6 wt%, K2O 5-8 wt%, TiO2 1-4 wt% and SiO2 for the rest. The present invention raises the high temperature oxidation resistance and heat corrosion resistance of the substrate and raise the stripping-off resistance of the coating and avoids the mutual diffusion between elements.

Description

Technical field: [0001] The invention relates to material science, and in particular provides a method for improving the high-temperature protection performance of a high-temperature alloy by using a composite oxide coating and a metal bonding layer. Background technique: [0002] Due to the harsh service environment, protective coatings must be applied to aeroengine turbine blades to improve the high temperature oxidation and hot corrosion resistance of the base alloy. Traditional high-temperature protective coatings include diffusion coatings (such as aluminized coatings) and alloy cladding coatings (such as MCrAlY coatings). The basic design idea of ​​these coatings is to form a stable protective oxide film on the surface of the coating to provide protection to the base alloy during service. [0003] If an oxide layer is directly prepared on the surface of the alloy, it can also isolate the corrosion medium and reduce the corrosion rate of the alloy. Compared with tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00
Inventor 郑德有朱圣龙王福会谢冬柏熊玉明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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