Copper-base crystallizer surface laser cladding method

A technology of laser cladding and crystallizer, which is applied in the directions of fusion sputtering, superimposed layer plating, coating, etc., can solve problems such as affecting the bonding of copper matrix and cladding layer, oxidation of copper base material, poor melting, etc.

Active Publication Date: 2009-09-16
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding Cu component in the transition layer can increase the miscibility with the copper matrix, but it will reduce the absorption of the transition layer to the laser beam, which is likely to cause defects such as poor melting and oxidation of copper-based materials.
In addition, the preheating method used in the laser treatment process will cause the oxidation of the copper substrate and affect the bonding of the copper substrate and the cladding layer.

Method used

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  • Copper-base crystallizer surface laser cladding method
  • Copper-base crystallizer surface laser cladding method
  • Copper-base crystallizer surface laser cladding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ①Wipe the copper plate of the crystallizer with acetone to degrease, degrease with TGY-1 electrocleaning solution and activate with THY-2 activation solution, and then brush TDY-102 pure nickel coating with a voltage of 10V. The thickness of each brush plating is 0.05mm, and the thickness of the transition layer after 6 brush platings is 0.30mm;

[0028] ②Adjust CO 2 The power of the laser beam is 4000W, the laser beam is gathered into a spot of 3mm, the scanning speed of the control beam is 1000mm / min, and the transition layer is overlapped and scanned, and the overlap rate is 10%. During the scanning process, the back of the copper plate of the crystallizer is cooled by forced water , control the surface temperature below 300°C;

[0029] ③The transition layer is sandblasted and roughened, supersonic flame spraying is carried out, and the nickel-based alloy is sprayed. The Ni content in the nickel-based alloy is 96%, the C content is 0.1%, the total content of Cr, Si,...

Embodiment 2

[0033] ① After degreasing the copper plate of the crystallizer with acetone, roughen it by sand blasting, and control the roughness at Ra2~4μm, and carry out supersonic flame spraying. The spraying material is nickel-based alloy powder, and the composition: C content 0.05%, Cr, Si, B The total content is 3.5%, the Ni content is 96.45%, the particle size range is +5~-25μm, and the spraying thickness is 0.4mm;

[0034] ②Adjust CO 2 The laser beam power is 8000W, the laser beam is gathered into a 5mm spot, the beam scanning speed is 2000mm / min, and the overlap rate is 30%. During the scanning process, the back of the copper plate of the crystallizer is cooled by forced water to control the surface temperature of the workpiece below 300°C;

[0035] ③ Repeat step ① to carry out supersonic spraying of nickel-based alloy powder, the particle size range is +5 ~ -25μm, the content of Ni in the nickel-based powder alloy is 96%, the content of C is 0.1%, the total content of Cr, Si and B...

Embodiment 3

[0039]①Wipe the copper plate of the crystallizer with acetone to remove oil, and put it into the plating tank of nickel salt solution. The nickel salt solution is 100g / L of nickel sulfate, 21g / L of magnesium sulfate, 14g / L of boric acid, and 4g / L of sodium chloride. Voltage 8V, current density 2A / dm 2 , the transition layer thickness is 0.50mm;

[0040] ②Adjust CO 2 The power of the laser beam is 10000W, the laser beam is gathered into a spot of 6mm, the scanning speed of the laser beam is 3000mm / min, and the overlapping rate is controlled at 50%. 300°C;

[0041] ③ After degreasing the welded transition layer with acetone, sandblasting and roughening, the roughness is controlled at Ra2-4μm, and supersonic flame spraying is carried out. The spraying material is cobalt-based alloy powder, and the composition of cobalt-based alloy is: C content 0.1%, the total content of Cr, Si, B, W is 5%, the content of Fe is 1%, the balance of cobalt; the particle size range is +5~-25μm, an...

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Abstract

A copper-base crystallizer surface laser cladding method is characterized in that the method comprises the following steps in sequence: (1) preparing a nickel-base transition layer with thickness of 0.3-0.5mm; (2) melting the transition layer by using a mixing mode CO2 laser beam; (3) preparing a nickel-base or cobalt-base alloy work layer with thickness of 0.6-1.0mm by ultrasonic spraying; (4) melting transition layer by using the mixing mode CO2 laser beam; and (5) processing a laser cladding layer into a smooth surface. By the method of the invention, excellent metallurgically bonded cladding layers are formed on copper-base materials. The hardness and wearing resistance experiments show that the hardness of the work layer is above Hv350, which is improved by more than 3 times compared with the hardness of copper alloy; the wear loss of the laser cladding nickel-base or cobalt-base work layer is about 10mg and the high temperature wearing resistance is over 5 times as high as that of the copper alloy, thus having the effect of strengthening the copper alloy. The method of the invention is suitable for not only strengthening the copper-base crystallizer but also strengthening various copper-base alloy surfaces.

Description

technical field [0001] The invention relates to a surface laser cladding method, in particular to a laser cladding method on the surface of a copper-based crystallizer. Background technique [0002] The copper-based crystallizer is the "heart" of the continuous casting equipment. Its function is to continuously condense the molten steel at 1300°C into a billet. It is made of alloys with good thermal conductivity such as pure Cu, Cu-Ag, Cu-Cr or Cu-Cr-Zr. production. There is water cooling on the back of the crystallizer, so its contact temperature with molten steel is generally around 500°C. At the same time, the solidified billet has a certain friction effect on the surface of the mold, which makes the copper plate of the mold easy to be corroded, oxidized and worn, causing surface damage, affecting the continuity of cast steel production, and even causing steel breakout accidents in severe cases. Copper-based crystallizers are the second largest consumables in the metall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C23C24/10C23C4/12C23C4/06C25D5/06C25D3/12C25D5/12B22D11/059C23C4/129
Inventor 刘敏周克崧李福海马文有陈兴驰邓畅光赵利陈志坤
Owner GUANGDONG INST OF NEW MATERIALS
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