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Heat-corrosion-resistant composite enamel coating and preparation method thereof

An enamel and coating technology, which is applied in the composite enamel coating of superalloy parts and its preparation field, can solve the problems of poor diffusion and infiltration ability of hot corrosion medium, high content of low melting point components, etc., and achieve excellent protection and production High efficiency and improved high temperature stability

Active Publication Date: 2015-03-25
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

[0004] The object of the present invention is to provide a heat-resistant and corrosion-resistant composite enamel coating and its preparation method. The composite enamel coating prepared by optimizing the composition of the enamel coating and adding an appropriate amount of corundum particles overcomes the problem of the traditional enamel coating being prone to contact with superalloys during high-temperature service. The excessive interfacial reaction of the matrix causes the continuous dissolution of the alloy matrix; and overcomes the shortcomings of the traditional enamel coating, such as high content of low melting point components and poor resistance to diffusion and penetration of hot corrosive media, and has excellent thermal corrosion resistance and heat resistance. Comprehensive performance of cyclic peeling

Method used

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  • Heat-corrosion-resistant composite enamel coating and preparation method thereof
  • Heat-corrosion-resistant composite enamel coating and preparation method thereof
  • Heat-corrosion-resistant composite enamel coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using superalloy K444 as the matrix, the composite enamel coating is prepared, and the preparation process is as follows:

[0030] (1) Melting of enamel glaze:

[0031] The composition ratio of the enamel matrix is: silica 58wt%, zirconium dioxide 13wt%, alumina 6wt%, calcium oxide 5wt%, boron trioxide 4wt%, strontium oxide 3wt%, titanium dioxide 3wt%, sodium oxide 2wt%, potassium oxide 4wt%, nickel oxide 2wt%.

[0032] Mix the above oxides in a ball mill at a speed of 320 rpm for 24 hours. After mixing evenly, heat and smelt. The smelting process is as follows:

[0033] RT→500℃, heating at uniform speed for 1 hour;

[0034] 500℃→1000℃, heating at an average speed for 40 minutes;

[0035] 1000℃→1725℃, heating at an average rate for 1 hour;

[0036] The enamel glaze of specific composition is obtained by water quenching after 1.5 hours at a constant temperature of 1725 °C.

[0037] (2) Preparation of enamel micropowder: the enamel glaze obtained after water quenchin...

Embodiment 2

[0043] The preparation process of the heat-resistant corrosion-resistant composite enamel coating is the same as that in Example 1. The alloy matrix is ​​K444 superalloy. Using the same process, the ordinary composite enamel coating was prepared by sintering on the K444 superalloy substrate. Three groups of samples (K444 superalloy substrate, common composite enamel coating and the heat-resistant corrosion-resistant composite enamel coating) were subjected to thermal corrosion at 900° C. for 80 hours. The detailed process of hot corrosion is as follows:

[0044] (1) Hot corrosion salt: saturated 75wt% Na 2 SO 4 +25wt% NaCl brine;

[0045] (2) Through the air compressor, the pressure of 0.2MPa is sprayed on the K444 superalloy substrate to deposit 2.0~3.0mg / cm each time -2 The complex salt (75wt% Na 2 SO 4 +25wt%NaCl);

[0046] (3) Put the three groups of samples deposited with solid salt film into a constant temperature muffle furnace, corrode at 900°C for 5h, 20h, 40h...

Embodiment 3

[0053] The difference from Example 1 is that the composition of the enamel matrix is ​​as follows:

[0054] Silica 62wt%, Zirconium Dioxide 10.5wt%, Aluminum Trioxide 7wt%, Calcium Oxide 6wt%, Boron Trioxide 5wt%, Strontium Oxide 3.5wt%, Titanium Dioxide 3wt%, Potassium Oxide 2wt%, Nickel Oxide 1wt% %.

[0055] The heat-resistant corrosion-resistant enamel coating prepared on K444 superalloy has a dense structure and no microscopic defects such as bubbles and cracks inside the coating, such as Figure 7 shown.

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Abstract

The invention aims at providing a heat-corrosion-resistant composite enamel coating and a preparation method thereof. The heat-corrosion-resistant composite enamel coating is characterized by comprising an enamel matrix and ceramic particles, wherein the ceramic particles are corundum with the size of less than 5 mum, and the addition amount of the ceramic particles accounts for 15-30 wt% of the weight of the composite enamel coating; and the enamel matrix comprises the following components: 58-62 wt% of silicon dioxide, 10-13 wt% of zirconia dioxide, 5-8 wt% of aluminum oxide, 5-7 wt% of calcium oxide, 4-6 wt% of diboron trioxide, 2-4 wt% of strontium oxide, 2-4 wt% of titanium dioxide, 2-6 wt% of sodium oxide and / or potassium oxide and 0-2 wt% of nickel oxide. The heat-corrosion-resistant composite enamel coating has no problems of continuous dissolving of an alloy matrix caused by easy occurrence of excessive interface reaction between the conventional enamel coating and high temperature alloy matrix during high temperature service, and overhigh content of low-melting-point components and poor diffusion infiltration resistance of the conventional enamel coating, and has excellent comprehensive resistance against heat corrosion and thermal circulation spalling.

Description

technical field [0001] The invention relates to high temperature protection technology, and particularly provides a composite enamel coating which can be used for high temperature alloy parts and a preparation method thereof. Background technique [0002] Traditional high temperature protective coatings include metal coatings and ceramic coatings. Metal coatings, such as aluminized coatings and coated MCrAlY coatings, have obvious interdiffusion with the base alloy during high-temperature use, which seriously affects the high-temperature mechanical properties of the alloy. In addition, in the hot corrosion environment, the oxides generated on the surface of the metal coating are continuously dissolved in the deposited salt, and the protective oxide film cannot be formed quickly, and the hot corrosion rate is relatively fast. The thermal corrosion resistance of ceramic coating is better than that of metal coating, but due to its large difference in linear thermal expansion c...

Claims

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Application Information

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IPC IPC(8): C03C8/14C23D5/00
CPCC03C8/14C23D5/00
Inventor 陈明辉朱圣龙邬明钰王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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