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Method for spraying hypersonic flame on surface of intermediate/high-temperature furnace roller

A supersonic flame, medium and high temperature technology, applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of reduced service life, short working time, and low surface hardness of furnace rollers, so as to prolong the service life , Improve wear resistance, high bond strength effect

Active Publication Date: 2014-04-30
ANHUI MA STEEL SURFACE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cermet coating has good high temperature stability, but it is not suitable for remelting treatment; most of them use sealing treatment, using organic or inorganic sealing agent to fill the pores in the coating, and the epoxy resin of the organic sealing agent is mostly attached On the surface, for medium and high temperature furnace rolls with high working temperature, they cannot continue to work, the working time is short, the sealing agent fails, the corrosive medium enters through the pores of the coating, corrodes the furnace roll, and the service life of the furnace roll is greatly reduced; The surface hardness treated with porogen is low, the wear resistance is poor, and the service life of the furnace roller will be greatly reduced

Method used

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  • Method for spraying hypersonic flame on surface of intermediate/high-temperature furnace roller
  • Method for spraying hypersonic flame on surface of intermediate/high-temperature furnace roller
  • Method for spraying hypersonic flame on surface of intermediate/high-temperature furnace roller

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Experimental program
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Effect test

Embodiment 1

[0044] This embodiment includes the following steps:

[0045] The supersonic flame spraying method on the surface of medium and high temperature furnace rollers is carried out according to the following steps:

[0046] 1) Derusting the surface of the furnace roller until the surface of the furnace roller is smooth;

[0047] 2) The surface of the furnace roller is sandblasted to achieve a certain roughness. The roughness is determined according to the nature of the coating and the requirements of the user;

[0048] 2. Sealing agent configuration

[0049] 1) The composition of the sealing agent: Zirconium silicate alkoxide is used as the sealing agent, and PEG200 (polyethylene glycol), purified water, zirconium silicate and ethanol are mixed evenly according to the weight percentage, that is, PEG200: 30%, pure Water 20%, zirconium silicate: 15%, ethanol: 35%;

[0050] 2) Preparation conditions

[0051] Under normal temperature and pressure, add zirconium silicate to an ordin...

Embodiment 2

[0071] Processed with the method of Example 1, the spraying process parameters are listed in Table 1, and the test results are listed in Table 2.

Embodiment 3

[0073] Processed with the method of Example 1, the spraying process parameters are listed in Table 1, and the test results are listed in Table 2.

[0074] Table 1 embodiment process parameters

[0075] unit Example 1 Example 2 Example 3 oxygen flow L / m 838 858 878 fuel flow L / h 22.0 22.5 23.0 Powder feeding speed g / min 25.0×2 27.5×2 30.0×2 Spray distance mm 320 340 360 Coatings 22 20 18 PEG200 % 30 30 30 pure water % 20 25 15 Zirconium silicate % 15 20 20 ethanol % 35 25 35 Natural drying time, curing temperature and time 2h, 200℃, keep warm for 2.5h 3h, 250℃, keep warm for 2h 4h, 300℃, keep warm for 2h

[0076] Table 2 Test results

[0077] unit Example 1 Example 2 Example 3 Coating thickness mm 0.098 0.091 0.087 Bond strength MPa 75 82 78 Porosity % 0.58 0.55 0.64 Surface hardness HV 1 884.6 912....

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Abstract

The invention relates to a method for spraying a hypersonic flame on the surface of an intermediate / high-temperature furnace roller, belongs to the technical field of material surface treatment, and in particular relates to a spraying method of spraying restoration the surface of the intermediate / high-temperature furnace roller. The method is characterized by comprising the following steps: 1, pretreating the furnace roller to be sprayed; 2, preparing a hole sealing agent; 3, fixing the furnace roller on spraying equipment by using a clamp, determining the rotating speed according to the size of the furnace roller and controlling the moving speed of a mechanical arm of the spraying equipment according to the fact that the mechanical arm is moved by 5mm when the furnace roller turns a circle; 4, spraying, namely, starting the equipment for spraying; 5, smearing the hole sealing agent; 6, curing; 7, polishing; and 8, performing the abrasion testing. The method has the advantages that a coating layer is bonded with a basal body well, so that the coating layer has the strong bonding strength and the high peeling resistance; the coating layer is compact in tissue, so that the porosity of the coating layer is decreased below 1%; and a majority of Cr3C2 hard phases are maintained during the spraying of the coating layer, so that the high rigidity of the coating layer is realized, the abrasion resistance of the coating layer is improved and the service life of the coating layer is prolonged.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and in particular relates to a spraying method for repairing the surface of medium-high temperature furnace rolls by spraying. Background technique [0002] Furnace roll is a key part of the heat treatment equipment on the continuous strip steel production line. The surface quality of the furnace roll directly affects the surface quality of the strip steel, such as scratches, accumulations, and stains on the surface of the strip steel. Therefore, it is necessary to improve the surface quality of the furnace roll . At present, for the furnace rollers on the continuous strip steel production line, thermal spraying coatings are used for surface treatment, which can effectively inhibit the oxidative decomposition of powder in the sprayed materials, especially for the preparation of carbide-based cermet coatings by supersonic flame spraying. The low flame flow temperature makes mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129
Inventor 胡小红张世宏张龙解明祥
Owner ANHUI MA STEEL SURFACE TECH CO LTD
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