Ni(Fe)-Al series intermetallic compound coating preparing method
A technology of intermetallic compounds and coatings, which is applied in the direction of metal material coating technology, coating, molten spraying, etc., can solve the problems of not being able to well meet industrial needs, limited application range, and difficulty in preparation and processing, and achieve Achieve thermal stress matching, simple coating preparation process, and broad application prospects
Inactive Publication Date: 2007-11-28
SHANDONG UNIV OF SCI & TECH
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[0003] Intermetallic compounds are very good high-temperature structural materials, which have excellent high-temperature corrosion resistance and wear resistance, and can well meet the above needs; however, this type of material has disadvantages such as high room temperature brittleness, low fracture resistance, and difficulty in preparation and processing. Very limited range of applications as a structural material
[0004] The wear-resistant and corrosion-resistant coatings prepared by traditional coating technology are generally composed of multi-phase alloy materials, or multi-phase composite coatings formed of alloy materials, intermetallic compounds, and ceramics. Due to the difference in electrochemical characteristics of phases, it is easy to form electrochemical corrosion or localized corrosion at high temperature, which accelerates the damage and failure of the coating, and cannot well meet the needs of the industry.
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[0011] The preparation method is described below by taking the preparation of Ni-Al intermetallic compound coating on the thermocouple protection sleeve made of GH3030 nickel-based material as an example.
[0012] 1. Purify the surface of the GH3030 nickel-based superalloy thermocouple protective sleeve and then sandblast it to obtain an active surface; 2. Spray 2 mm of pure aluminum on the sleeve with arc spraying equipment; 3. Cast a layer on the pure aluminum coating layered water glass and SiO 2 The glaze forms a sealed shell; 4. The sealed shell is further purified, and then put into a high-temperature furnace for high-temperature metallurgical diffusion reaction, the diffusion temperature is 950°C; 5. Stop the furnace after 4.5 hours of diffusion, and let the protective sleeve slowly in the furnace Cool it, take it out when the furnace temperature drops to 250°C, and let it cool naturally in the air.
[0013] The thermocouple protection sleeve is applied to the ethylene...
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Abstract
The preparation process of intermetallic Ni (Fe)-Al compound coating is one hot spraying high temperature metallurgical diffusion process. After the base body metal is treated through surface purification, sand blasting and spraying with pure aluminum, one sealing casing is formed with water glass and SiO2 glaze; after further surface purification, the base body is metallurgically diffused inside one high temperature electric furnace and then cooled inside the furnace to 250-300 deg.c before being taken out for air cooling. By means of regulating the technological parameters, the present invention can obtain intermetallic Ni (Fe)-Al compound coating adaptive for various high temperature corrosion environment.
Description
technical field [0001] The invention belongs to a method for preparing an intermetallic compound surface coating by thermal spraying technology, in particular to a preparation method for a high-temperature wear-resistant and corrosion-resistant surface coating of an iron-based or nickel-based metal material. technical background [0002] The development of modern industry has put forward higher requirements for industrial products in electric power, chemical industry and other industries, requiring products to be able to operate for a long time under high parameters (such as high temperature, high speed, high pressure), high automation and harsh working conditions. Inevitably, higher requirements are put forward for the performance of the surface of the parts. For example, in the petrochemical industry, the operating temperature of some equipment parts is as high as 1300 ° C, and the working environment is concentrated hydrogen sulfide (98% H 2 S) Strong corrosive gas; high...
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IPC IPC(8): C23C4/08C23C4/12C23C4/18C23C4/02C23C4/131
Inventor 孙宏飞王灿明宋强万殿茂
Owner SHANDONG UNIV OF SCI & TECH