Preparation technique of continuous casting crystallizer copper plate surface cermet coating

A technology of continuous casting mold and surface metal, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem of easy oxidation, it should be sprayed as soon as possible, no preheating is required, and sand particles are easy to insert into the copper plate , coating cracks and other problems, to achieve the effect of uniform and smooth microscopic surface, dispersing residual stress and improving bonding strength

Active Publication Date: 2014-03-05
XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface roughness of this technical solution after sandblasting is 5~10um. Sandblasting is beneficial to obtain a highly active surface, but excessive sandblasting will make sand fragments easy to be embedded in the copper plate, and the surface activity of the copper plate after sandblasting is too high. It is extremely easy to oxidize and should be sprayed as soon as possible without preheating; in addition, the cermet coating prepared by supersonic flame spraying is porous, and some voids even extend from the surface of the coating to the surface of the protected substrate. Accumulation at the interface will cause cracking and peeling off of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A cermet coating on the copper plate surface of a continuous casting crystallizer and a preparation process thereof, specifically as follows:

[0020] ① Copper plate surface degreasing: after conventional chemical degreasing method, perform ultrasonic cleaning, the ultrasonic cleaning process: temperature 55-75 ℃, ultrasonic power 22.5KW, add PWC-007 grease cleaning agent 5-10%, clean 10~15min;

[0021] ②Sand blasting on the surface of the copper plate: 120-200 mesh brown corundum sand is used for sand blasting treatment, the compressed air pressure is 0.6-1.0MPa, and the surface roughness Ra after treatment is 1.25-5μm;

[0022] ③ Preparation of ceramic coating: WC12Co powder is used to prepare ceramic coating by supersonic flame spraying. The process parameters are: oxygen flow rate 1700-2300GPH, nitrogen flow rate 5.0-6.5GPH, spraying distance 250-400mm, spraying thickness 0.1-1.5mm;

[0023] For the WC12Co powder, the powder with a particle size of 15-45 μm is...

Embodiment 2

[0035] A cermet coating on the copper plate surface of a continuous casting crystallizer and a preparation process thereof, specifically as follows:

[0036] ① Copper plate surface degreasing: after conventional chemical degreasing method, perform ultrasonic cleaning, the ultrasonic cleaning process: temperature 55-75 ℃, ultrasonic power 22.5KW, add PWC-007 grease cleaning agent 5-10%, clean 10~15min;

[0037] ②Sand blasting on the surface of the copper plate: 120-200 mesh brown corundum sand is used for sand blasting treatment, the compressed air pressure is 0.6-1.0MPa, and the surface roughness Ra after treatment is 1.25-5μm;

[0038] ③ Preparation of ceramic coating: WC12Co powder is used to prepare ceramic coating by supersonic flame spraying. The process parameters are: oxygen flow rate 1700-2300GPH, nitrogen flow rate 5.0-6.5GPH, spraying distance 250-400mm, spraying thickness 0.1-1.5mm;

[0039] For the WC12Co powder, the powder with a particle size of 15-45 μm is...

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Abstract

The invention discloses a preparation technique of a continuous casting crystallizer copper plate surface cermet coating, which comprises the following steps: copper plate surface oil removal, copper plate surface sandblasting, coating preparation and hot spraying subsequent treatment, wherein the hot spraying subsequent treatment is vacuum heat treatment or hole sealing treatment. The preparation technique of the technical scheme is simple to operate, and has the advantages of fewer steps and high efficiency. After being subjected to vacuum heat treatment or hole sealing treatment, the cermet coating has the advantages of high microhardness, small internal stress, favorable wear resistance, favorable thermal crack resistance, high bonding strength, favorable bonding property and low thermal conductivity, can lower the thermal crack of the crystallizer copper plate in the high-temperature region, can effectively decelerate the heat conduction inside crystallizer (especially the meniscus surface), and can be widely used in continuous casting of a medium/low-speed continuous caster.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, in particular to a preparation process of a cermet coating on the surface of a copper plate of a continuous casting crystallizer. Background technique [0002] In continuous casting production, the quality of crystallized copper plates directly affects the quality of the surface of the slab and the operating rate of the continuous casting machine. With the development of large-scale continuous casting equipment, high casting speed, on-line width adjustment, flow control, breakout prediction and other technologies, the heat load of mold copper plate has increased greatly, and higher performance of mold copper plate is required. [0003] In terms of crystallizer copper plate pretreatment, ultrasonic cleaning is a surface degreasing technology for mold copper plate developed in recent years. It uses the cavitation effect generated by ultrasonic waves in liquid, and cooperates with appropr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/18B22D11/057B22D11/059C23C4/129
Inventor 朱书成徐文柱黄国团
Owner XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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