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Workpiece wear-resistant coating and spraying method for same

A technology for wear-resistant coatings and workpieces, applied in coatings, metal material coating processes, fusion spraying, etc., can solve problems such as inability to repair offline crystallizers, low slab output and production efficiency, and short service life

Pending Publication Date: 2019-02-12
NEW METALLURGY HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a wear-resistant coating for workpieces and a spraying method thereof that can at least solve one of the following technical problems: (1) the wear-resistant coating with a single-layer structure has poor wear resistance, short service life, and shutdown The replacement time is long, and the slab output and production efficiency are low; (2) The existing process cannot partially repair the off-line crystallizer, and the worn narrow-side copper plate of the crystallizer can only be used for other purposes, resulting in waste of production materials

Method used

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  • Workpiece wear-resistant coating and spraying method for same
  • Workpiece wear-resistant coating and spraying method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Raw materials: bottom layer NiCr composite powder, composition 80%Ni-20%Cr, powder particle size 15-50μm; surface layer NiCr-Cr 3 C 2 Composite powder, composition 25% NiCr-75% Cr 3 C 2 , The particle size of the powder is 15-50 μm.

[0056] The object to be sprayed is a brand-new mold narrow-side copper plate, and the base material is chrome-zirconium copper. First, decontaminate the surface to be sprayed and use acetone to remove surface dirt. Afterwards, use 24# brown corundum sand to carry out sandblasting and roughening treatment on the surface of the copper substrate to be sprayed, until the surface roughness is greater than 6 μm. The coating is prepared by explosive spraying process, first spraying NiCr composite powder, and then spraying the bottom layer, the bottom spraying time is 3min; then spraying NiCr-Cr on the bottom layer 3 C 2 Composite powder, complete the spraying of the surface layer, and the spraying time of the surface layer is 15 minutes. T...

Embodiment 2

[0063] Raw materials: bottom layer NiCr composite powder, composition 80%Ni-20%Cr, powder particle size 15-50μm; surface layer NiCr-Cr 3 C 2 Composite powder, composition 25% NiCr-75% Cr 3 C 2 , Powder particle size 15 ~ 50μm.

[0064] The object to be sprayed is a brand-new mold narrow-side copper plate, and the base material is chrome-zirconium copper. First, decontaminate the surface to be sprayed and use acetone to remove surface dirt. Afterwards, use 24# brown corundum sand to carry out sandblasting and roughening treatment on the surface of the copper substrate to be sprayed, until the surface roughness is greater than 6 μm. The coating is prepared by explosive spraying process, first spraying NiCr composite powder, and then spraying the bottom layer, the bottom spraying time is 6min; then spraying NiCr-Cr on the bottom layer 3 C 2 Composite powder, complete the spraying of the surface layer, and the spraying time of the surface layer is 25 minutes. The technical ...

Embodiment 3

[0070] Raw materials: bottom layer NiCr composite powder, composition 80%Ni-20%Cr, powder particle size 15-50μm; surface layer NiCr-Cr 3 C 2 Composite powder, composition 25% NiCr-75% Cr 3 C 2 , The particle size of the powder is 15-50 μm.

[0071] The object to be sprayed is a brand-new mold narrow-side copper plate, and the base material is chrome-zirconium copper. First, decontaminate the surface to be sprayed and use acetone to remove surface dirt. Afterwards, use 24# brown corundum sand to carry out sandblasting and roughening treatment on the surface of the copper substrate to be sprayed, until the surface roughness is greater than 6 μm. The coating is prepared by explosive spraying process, first spraying NiCr composite powder, and then spraying the bottom layer, the bottom spraying time is 4min; then spraying NiCr-Cr on the bottom layer 3 C 2 Composite powder, complete the spraying of the surface layer, and the spraying time of the surface layer is 20 minutes. T...

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Abstract

The invention relates to a workpiece wear-resistant coating and a spraying method for the same and belongs to the field of superficial technologies. According to the invention, on one side, the problems that wear-resistant coatings of single-layer structures in the prior art are poor in wear resistance, short in service life, long in replacement duration after halt and low in yield and productionefficiency of slabs can be solved; and on the other side, the problems that offline crystallizers cannot be partially repaired with the prior art, narrow-edged copper plates of the damaged crystallizers can only be used for other purposes and thus production materials are wasted can be solved. The workpiece wear-resistant coating comprises a bottom layer and a face layer, wherein the bottom layerserves as a transition layer and only covers a worn and damaged part of a clad layer; and the face layer covers an entire coating of a workpiece. The spraying method provided by the invention comprises the steps that areas outside a to-be-sprayed area are protected; the bottom layer is sprayed at first; and then protection is removed and the face layer is sprayed. According to the invention, bonding strength between the face layer and a copper base body can be improved; thermal shock resistance of the coating can be enhanced; and the service life of the surface coating of the copper plate of the crystallizer can be prolonged.

Description

technical field [0001] The invention relates to the field of surface technology, in particular to a workpiece wear-resistant coating and a spraying method thereof. Background technique [0002] In continuous casting production, the crystallizer is the core component of the continuous casting machine. In actual production, the wear degree of the narrow side copper plate of the crystallizer is far greater than that of the wide side copper plate. [0003] The commonly used methods to improve the wear resistance of the narrow side copper plate surface are electroplating and thermal spraying. The electroplating layer improves the wear resistance of the copper plate to a large extent and prolongs the service life of the mold, but the service life of the plating layer is relatively low. Only 50,000-60,000 tons of steel must be offline for maintenance, which cannot meet the high-efficiency continuous casting The needs of development; and the serious pollution of the electroplating...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/08C23C4/126C23C4/02
CPCC23C4/02C23C4/06C23C4/08C23C4/126
Inventor 吕艳红张慧唐建新陶红标
Owner NEW METALLURGY HI TECH GRP
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