Method for preparing erosion-wear-resisting composite coating

A composite coating, erosion-resistant technology, used in coatings, metal material coating processes, manufacturing tools, etc., can solve problems such as spalling, power station boiler pipe protection, burst pipe leakage, etc., to extend service life and operate safely. Guaranteed effect

Inactive Publication Date: 2006-08-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In circulating fluidized bed boilers, the boiler pipes are in harsh environments such as high temperature, vulcanization, fly ash, slag, etc., and the generated flue gas contains a large number of hard fly ash particles. When the convective heating surface tube bundles, the surface of the tube wall is severely worn, resulting in serious damage to the local heating surface, and even causing tube explosion and leakage, resulting in shutdown accidents, causing great direct and indirect losses to the national economy
The most severely worn area of ​​the circulating fluidized bed boiler tube is at the junction of the combustion zone and the water wall. The general wear-resistant coating cannot guarantee the sa...

Method used

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  • Method for preparing erosion-wear-resisting composite coating
  • Method for preparing erosion-wear-resisting composite coating
  • Method for preparing erosion-wear-resisting composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Firstly, the metal substrate is cleaned to remove rust, dirt, etc. on the surface, and then a layer of hard alloy spots is spot-welded on the cleaned and decontaminated metal substrate with a self-developed self-protecting metal core spot surfacing welding wire. array. The welding current is 180-220A, the welding voltage is 18-22V, the distance between solder joints is 2mm, the diameter of solder joints is 4mm, and the height of solder joints is 2mm. The Rockwell hardness of the solder joint is HRC51. The metal substrate after spot surfacing is sandblasted and roughened, and a layer of erosion-resistant and wear-resistant coating is sprayed on the metal substrate after sandblasting and roughened by the prior art. The spraying current is 150-180A, the spraying voltage is 30-32V, and the spraying Air pressure 0.55MP, spraying distance 150mm. The thickness of the sprayed layer is 5mm, and the Rockwell hardness of the surface of the sprayed layer is about 60 (HR45N). The...

Embodiment 2

[0018] Firstly, the metal substrate is cleaned to remove rust, dirt, etc. on the surface, and then a layer of hard alloy spots is spot-welded on the cleaned and decontaminated metal substrate with a self-developed self-protecting metal core spot surfacing welding wire. array. The welding current is 180-220A, the welding voltage is 18-22V, the distance between solder joints is 3mm, the diameter of solder joints is 4mm, and the height of solder joints is 3mm. The Rockwell hardness of the solder joint is HRC50. The metal substrate after spot surfacing is sandblasted and roughened, and a layer of erosion-resistant and wear-resistant coating is sprayed on the metal substrate after sandblasting and roughened by the prior art. The spraying current is 150-180A, the spraying voltage is 30-32V, and the spraying Air pressure 0.55MP, spraying distance 150mm. The thickness of the sprayed layer is 8mm, and the Rockwell hardness of the surface of the sprayed layer is about 62 (HR45N). The...

Embodiment 3

[0020] Firstly, the metal substrate is cleaned to remove rust, dirt, etc. on the surface, and then a layer of hard alloy spots is spot-welded on the cleaned and decontaminated metal substrate with a self-developed self-protecting metal core spot surfacing welding wire. Array. The welding current is 180-220A, the welding voltage is 18-22V, the distance between solder joints is 4mm, the diameter of solder joints is 5mm, and the height of solder joints is 2mm. The Rockwell hardness of the solder joint is HRC52. The metal substrate after spot surfacing is sandblasted and roughened, and a layer of erosion-resistant and wear-resistant coating is sprayed on the metal substrate after sandblasting and roughened by the prior art. The spraying current is 150-180A, the spraying voltage is 30-32V, and the spraying Air pressure 0.55MP, spraying distance 150mm. The thickness of the sprayed layer is 10mm, and the Rockwell hardness of the surface of the sprayed layer is about 61 (HR45N). Th...

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Abstract

This invention relates to a surface engineering field used in the protection of power station boiler pipelines including: spot welding a layer of hardness alloy lattice on a cleaned metal matrix with self-protection metal core weld sticks, in which, the weld current is 180-220A, voltqge is 18-22V, welding point space is 2-5mm, diameter of the welding point is 4-5mm and the height is 2-3mm, the welded metal matrix is sprayed with sand to eliminate the oxidized skins, rust and the old coating and expose the metallic brightness then a compound layer of anti-erosion and anti-abrasion is sprayed on the matrix by an arc spraying method.

Description

Technical field: [0001] The invention belongs to the field of coating preparation in material processing engineering, and the invention is mainly applied to the protection of power plant boiler pipes. Background of the invention: [0002] With the rapid growth of my country's economy, the demand for electricity is increasing. In the power structure, my country's firepower equipment accounts for more than 3 / 4 of the total installed capacity, and the situation of excessive firepower will last for a long period of time. Therefore, accelerating the development of high-efficiency, low-pollution thermal power units and accelerating the development of clean coal combustion technology is the development direction of my country's thermal power technology. The circulating fluidized bed (CFB) boiler not only solves the problem of efficient and rational utilization of energy, but also greatly reduces the emission of pollutants. As an environment-friendly boiler, it can burn various fu...

Claims

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Application Information

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IPC IPC(8): C23C4/00C23C4/02B23K9/04C23C4/131
Inventor 蒋建敏贺定勇傅斌友栗卓新李晓延
Owner BEIJING UNIV OF TECH
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