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Cold spray repairing method for crystallizer copper plate

A crystallizer copper plate and repair method technology, applied in the field of crystallizer repair, can solve problems affecting the repair effect and performance of the crystallizer, interface macroscopic cracking, poor thermal deformation resistance of the repair layer interface, etc.

Active Publication Date: 2011-09-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use process, it was found that the bonding area between the particle coating and the surface of the copper plate is small and the bonding strength is low, and it is easy to produce macroscopic cracks at the interface during the preparation of the repair layer or the post-treatment process; Cold and heat fatigue is a common method to measure the thermal shock resistance of crystallizer materials, and the thermal deformation resistance of the interface of the repair layer obtained by the above method is poor, and the coating is easy to fall off when it is stressed or heated. ℃ The number of cold and heat fatigue generally does not exceed 400, and macro cracks appear, which affects the repair effect and performance of the crystallizer

Method used

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  • Cold spray repairing method for crystallizer copper plate
  • Cold spray repairing method for crystallizer copper plate
  • Cold spray repairing method for crystallizer copper plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] First mill the copper plate surface of the crystallizer to remove oil stains, and then perform surface sandblasting treatment, the roughness is Ra1.8; the driving gas used for the preparation of the reinforced pits is nitrogen, and the hard particles are alumina, spherical in shape, with an average particle size of 23 μm, The angle between the injection direction and the normal direction of the copper plate surface of the crystallizer is 0°, the speed of hard particles is 600m / s, the single-point residence time of the nozzle is 30s, the diameter of the outer circle of the pit is φ8mm, and the depth of the center of the pit is 1mm. The surface of the crystallizer is evenly distributed, the distance between two adjacent pits is 24mm, and the inner surface roughness of the resulting pits is Ra1.2μm; the copper alloy particles used for repairing the reinforcement points are spherical, with an average particle size of 38μm, and the spraying direction of the copper alloy partic...

Embodiment 2

[0049] Grinding the surface of the copper plate of the crystallizer to obtain a flat surface, and then sandblasting the surface, the roughness is Ra2.3; the driving gas used for the preparation of the enhanced pit is argon, and the hard particles are yttrium oxide, which is ellipsoidal. The average particle size is 28μm, the angle between the injection direction and the normal direction of the mold copper plate surface is 5°, the speed of hard particles is 800m / s, the single point residence time of the nozzle is 20s, the diameter of the outer circle of the pit is φ10mm, and the depth of the center of the pit is 0.9mm, the reinforcement pits are evenly distributed within 100mm from the four sides of the crystallizer, the distance between two adjacent pits is 30mm, the inner surface roughness of the obtained pits is Ra1.2μm, and there is no reinforcement pit in the middle; the copper used for repairing the reinforcement points The alloy particles are spherical, with an average pa...

Embodiment 3

[0051] Grinding the surface of the copper plate of the crystallizer to obtain a flat surface, and then performing sandblasting on the surface, the roughness is Ra3.3; the driving gas used for the preparation of the reinforced pit is argon, and the hard particles are yttrium oxide, which is irregular in shape , the average particle size is 64μm, the angle between the injection direction and the normal direction of the mold copper plate surface is 10°, the speed of hard particles is 550m / s, the single point residence time of the nozzle is 43s, the diameter of the outer circle of the pit is φ12mm, and the depth of the center of the pit is The reinforced pits are evenly distributed on the surface of the crystallizer, the distance between two adjacent pits is 28mm, and the inner surface roughness of the obtained pits is Ra1.6μm; the copper alloy particles used for repairing the reinforced points are spherical, with an average particle size of 18μm The particle spraying direction is ...

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Abstract

The invention discloses a cold spray repairing method for a crystallizer copper plate. The method mainly comprises the following steps: preparing textured appearance with natural streamline pits on the surface of a copper plate to be repaired by using supersonic hard particles so as to remarkably increase the surface area of the surface to be repaired of the crystallizer on the premise that the surface meets the cold spray repairing requirements; then filling the textured pits by using the cold air-powered spraying technology to form multiple reinforcing points with an increased combined areaand improving the stress distribution of an interface at the same time; and finally performing integral spray repairing on the surface of the copper plate, and performing annealing and size recovery.The method can increase the combined area and combination strength of the spray repairing layer and the copper plate surface, improve the heat conduction rate and alternating heat stress resistance of the copper plate repairing layer, thereby prolonging the service cycle of the copper plate.

Description

technical field [0001] The invention relates to crystallizer repair technology, more specifically, relates to a cold spray repair method for crystallizer copper plate. Background technique [0002] The crystallizer is one of the key components in metal continuous casting and rolling machinery, especially in metal slabs, metal thin strips, and thin plate continuous casting equipment. Its main function is to rapidly cool and solidify the molten metal into a strip blank with a certain solidification thickness. Among them, most of the copper plates in contact with the molten metal are made of copper alloy materials. The working requirement of the crystallizer is to solidify the high-temperature liquid metal in a short period of time, and at the same time, it must bear the erosion of the molten metal and the wear of the strip blank. During this process, one side of the crystallizer copper plate is in contact with the molten metal, and the other side is a water-cooled surface. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
Inventor 梁永立张俊宝张宇军史弼
Owner BAOSHAN IRON & STEEL CO LTD
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