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Composite coating layer on surface of high-resistant crystallizer or crystallizing roller and manufacturing method thereof

A technology of surface compounding and manufacturing methods, applied in the direction of pressure inorganic powder coating, etc., to achieve good thermal conductivity and wear resistance, and improve the wear resistance of coatings

Active Publication Date: 2011-05-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of hard particle-reinforced composite coatings on the surface of crystalline rollers by cold air dynamic spraying technology.

Method used

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  • Composite coating layer on surface of high-resistant crystallizer or crystallizing roller and manufacturing method thereof
  • Composite coating layer on surface of high-resistant crystallizer or crystallizing roller and manufacturing method thereof
  • Composite coating layer on surface of high-resistant crystallizer or crystallizing roller and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The matrix material of the composite coating is a nickel alloy coating, and the average particle size of the powder used is 30 microns; the reinforcement is an irregular Fe-based amorphous alloy, and the average size of the reinforcement is 90 microns; the particle content of the reinforcement is 18%; the surface of the crystallization roll After turning and sandblasting, the cold air power spraying preparation process is as follows: the working gas is industrial nitrogen, the working gas pressure is 3.0MPa, the working gas temperature is 500°C, and the thickness of the single layer is 200 microns. The total thickness of the obtained composite coating is 4 mm, and the morphology of the composite coating and the distribution of reinforcement particles are as follows: figure 2 As shown, the Fe-based amorphous reinforcement is dispersed in the Ni matrix, and the addition of the amorphous reinforcement increases the wear resistance of the composite coating by 35% compared w...

Embodiment 2

[0065] The matrix material of the composite coating is copper alloy coating, the average particle size of the powder used is 25 microns; the reinforcement is α-Al 2 o 3 Particles, the average size of the reinforcement is 70 microns; the content of the reinforcement particles is 20%; the surface of the crystallization roller is turned and sandblasted, and the cold air power spraying preparation process is as follows: the working gas is industrial nitrogen, the working gas pressure is 2.6MPa, and the working gas temperature is 420 °C, the thickness of the single layer is 220 microns. The total thickness of the resulting composite coating is 5 mm, and the morphology of the composite coating and the distribution of reinforcement particles are as follows: image 3 Shown, α-Al 2 o 3 The particles are uniformly dispersed in the Cu matrix, and the α-Al 2 o 3 The addition of particles makes the wear resistance of the composite coating 30% higher than that of the Cu matrix.

Embodiment 3

[0067] The matrix material of the composite coating is chromium alloy coating, and the average particle size of the powder used is 25 microns; the reinforcement is silicon carbide particles, and the average size of the reinforcement is 30 microns; the content of reinforcement particles is 20%; the surface of the crystal roller is turned and sandblasted. , The cold air dynamic spraying preparation process is as follows: the working gas is industrial nitrogen, the working gas pressure is 3.6 MPa, the working gas temperature is 700 ° C, and the thickness of the single layer is 150 microns. The total thickness of the obtained composite coating is 3mm, and the wear resistance of the composite coating is 28% higher than that of the substrate.

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Abstract

The invention relates to a manufacturing method of a composite coating layer on the surface of a high-resistant crystallizer or a crystallizing roller. The manufacturing method is as follows: adopting a preparation technology of a cold-gas dynamic spraying composite coating layer; utilizing high-pressure gas to carry metal or mixed particles of alloy matrix particles and hard reinforcement particles; increasing the speed of the metal or the mixed particles by a supersonic nozzle to be extremely high so as to collide with the surface of a copper alloy matrix of the crystallizer or the crystallizing roller; and generating strong plastic deformation by the metal or the alloy particles so as to lead the metal or the alloy particles to be bonded on the surface of the crystallizer or the crystallizing roller to form a composite coating layer. By utilizing the manufacturing method, good heat conductivity of the metal or the alloy matrix and excellent wear-resistant performance of a reinforcement are utilized comprehensively, the surface coating layer of the crystallizer or the crystallizing roller with good comprehensive performance is obtained, and the online service life of the crystallizer or the crystallizing roller is prolonged.

Description

technical field [0001] The invention relates to the manufacture and repair technology of continuous casting crystallizers or crystallization rolls, in particular to a composite coating on the surface of high wear-resistant crystallizers or crystallization rolls and a manufacturing method thereof. Background technique [0002] The crystallizer is a key component in metal continuous casting and rolling machinery, especially in the continuous casting of thin metal strips and sheets. Its main function is to rapidly cool and solidify molten metal into strip blanks with a certain solidification thickness. The crystallization roll is a key component in the continuous casting and rolling of thin metal strips. The molten steel enters the molten pool composed of two counter-rotating crystallization rolls and side sealing plates through the flow distributor. The liquid metal is rapidly cooled on the crystallization roll. The surface is solidified into a billet shell with a certain thic...

Claims

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Application Information

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IPC IPC(8): B22D11/059B22D11/057C23C24/04C21D1/30C23F17/00C22C32/00B22F1/00
Inventor 梁永立张俊宝史弼张宇军
Owner BAOSHAN IRON & STEEL CO LTD
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