Method for preparing hot-spraying T400 coating material and coating layer

A coating material, thermal spraying technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of shortened service life, reduced engine efficiency, shortened service time of turbine blades, etc. Process control, low oxygen content, easy coating process effect

Inactive Publication Date: 2008-04-09
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Application Information

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Problems solved by technology

[0002] Aviation turbine disk seals, turbine blades, metallurgical rolls, high-temperature annealing furnace rolls and other components work in an atmosphere of high temperature, high oxidation and high erosion. The service life of turbine blades is shortened due to high temperature and high erosion in the environment, and the service life of materials used in the metallurgical industry such as rolls is greatly shortened due to the harsh working environment

Method used

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  • Method for preparing hot-spraying T400 coating material and coating layer

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preparation example Construction

[0019] The preparation method of T400 coating material of the present invention comprises the following steps:

[0020] 1) Take metal materials: 7-12% by weight of chromium, 20-30% by weight of molybdenum, 2-5% by weight of silicon, and the balance of Co, or choose 7-12% by weight of chromium, 20-30% by weight of molybdenum, 2-30% by weight of silicon 5% by weight, chromium-molybdenum-silicon-cobalt alloy with the balance of Co;

[0021] 2) Put the selected raw materials into the gas atomization equipment, and obtain chromium molybdenum silicon cobalt alloy powder through gas atomization technology;

[0022] The gas atomization technology described is: heating the gas atomization equipment by medium frequency induction, raising the temperature to 1300-1550°C, keeping it warm for 10-60 minutes, and using conventional T400 alloy refining and degassing to produce the alloy powder, that is, in the smelting furnace The alloy is in a semi-molten state, add a little CaF 2 , when th...

Embodiment 1

[0026] Take the alloy composition Cr9wt%, Mo26wt%, Si4wt%, Co balance, put it into non-vacuum atomization equipment, use medium frequency induction heating, when the temperature is heated to 1450 ℃, keep it warm for 18 minutes, after the alloy liquid is homogenized, with CaF 2 Refining and degassing; using argon atomization, the atomization process parameters are: atomization pressure is 2.5MPa, and the diameter of the diversion tube is 5mm. Then sieve.

[0027] The process parameters of thermal spraying T400 coating prepared by atmospheric plasma thermal spraying process for the above materials are: arc current 470A; arc voltage 70V; argon pressure 0.7MPa; argon flow 50L / min, powder feeding speed 35g / min, spraying distance 150mm. Then sieve.

Embodiment 2

[0029] Take the alloy composition Cr9.5% by weight, Mo29.5% by weight, Si3% by weight, and the balance of Co, put it into a non-vacuum atomization equipment, use intermediate frequency induction heating, heat it for 20 minutes when the temperature is heated to 1500 ° C, and wait for the alloy liquid After homogenization, use CaF 2 Refining and degassing, using argon atomization, the atomization process parameters are: atomization pressure is 205MPa, and the diameter of the diversion tube is 7mm. Then sieve.

[0030] The process parameters of thermal spraying T400 coating prepared by atmospheric plasma thermal spraying process for the above materials are: arc current 530A; arc voltage 80V; argon pressure 0.85MPa; argon flow rate 55L / min powder feeding speed 50g / min spraying distance 200mm.

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Abstract

The invention discloses a coating material of T400 for heat spraying and a preparation method, wherein the heat spraying coating material of T400 is chrome molybdenum silicon cobalt alloy powder, which comprises chrome 7-12% (weight percentage), molybdenum 20-30% (weight percentage), silicon 2-5 (weight percentage), the rest being Co. The particle size of the chrome molybdenum silicon cobalt alloy powder is:-100+500 mesh; the main body is within -120+400 mesh. The preparation method for the T400 heat spraying coating is that air plasma or flame heat spraying technique is adopted, the technical parameter for the preparation for T400 heat spraying coating is: arc current is less than or equal to 600A; arc voltage is less than or equal to 90V; argon pressure 0.6-0.9MPa; argon flux 30-70L/min; powder feeding speed 30-60g/min; spraying distance 150mm-250mm. The invention is an anti-oxidation wear resistant coating material. The oxygen content of the powder is low, the coating technique process is easy to control, the coating is with multiple good performances such as anti-oxidation, wear resistant, anti-fretting wear, and the preparation cost is relatively low, the application range is wide. The invention has provided a novel material for the protection and repairing of some of the parts of aviation and metallurgy industries of China.

Description

technical field [0001] The invention relates to a coating material. In particular, it relates to a thermal spraying T400 coating material and coating preparation method with low oxygen content in the powder, easy control of the coating process, and the coating has anti-oxidation, wear resistance and fretting wear resistance. Background technique [0002] Aviation turbine disc seals, turbine blades, metallurgical rolls, high-temperature annealing furnace rolls and other components work in an atmosphere of high temperature, high oxidation and high erosion. The service life of turbine blades is shortened due to the high temperature and high erosion of the environment, and the service life of materials used in the metallurgical industry such as rolls is greatly shortened due to the harsh working environment. In view of the characteristics of the above materials, the use of coating repair is an ideal choice. The advantages of using coatings are: coating can significantly improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C22C19/07B22F9/08C23C4/12B22F1/00C23C4/129C23C4/134
Inventor 曾克里宋希健刘金健许根国
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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