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Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles

A technology of tungsten carbide ceramics and composite materials, which is applied in the fields of metallurgy, machinery, materials, and electric power. It can solve the problem of dry ash removal technology that affects the operation efficiency of thermal power plants, operation safety, power generation costs, and parts wear, and cannot significantly improve dry ash removal. The erosion and wear resistance of the system and the service life and other issues are achieved, and the effects of good self-fluxing and wettability, high hardness, and reduced preparation costs are achieved.

Inactive Publication Date: 2009-11-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the serious wear problem of dry ash removal system components has always been the main obstacle to the wide application of dry ash removal technology in my country, and it is also one of the main problems affecting the operation efficiency, operation safety and power generation cost of thermal power plants
In order to improve the wear resistance of the ash removal system, traditional arc surfacing wear-resistant materials or electroplating hard chromium methods are mainly used in my country. So far, neither of these two methods can significantly improve the erosion and wear resistance of the dry ash removal system and the use life

Method used

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  • Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles
  • Method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, adopt 35%WC+65%NiCrBSi mixed spraying powder, plasma spraying parameter is: electric current 410A; Voltage 49V; Primary gas (Ar) 46L / min; Secondary gas (H 2 ) 1.5L / min; powder feeding speed 32g / min; spraying distance 90mm; spraying speed 150mm / s, prepared WC P / NiCrBSi composite coating. WC P The erosion wear resistance rate of / NiCrBSi coating is 5.3×10 -3 mm 3 / g-5.6×10 -3 mm 3 / g; coating / substrate interface bonding strength is 30MPa-36MPa.

Embodiment 2

[0022] Embodiment 2, adopt 33%WC+67%NiCrBSi mixed spraying powder, plasma spraying parameter is: electric current 410A; Voltage 49V; Primary gas (Ar) 46L / min; Secondary gas (H 2) 1.5L / min; powder feeding speed 32g / min; spraying distance 90mm; spraying speed 150mm / s, prepared WC P / NiCrBSi composite coating. WC P The erosion wear resistance rate of / NiCrBSi coating is 5.5×10 -3 mm 3 / g-5.8×10 -3 mm 3 / g; coating / substrate interface bonding strength is 30MPa-37MPa.

Embodiment 3

[0023] Embodiment 3, adopt 37%WC+63%NiCrBSi mixed spraying powder, plasma spraying parameter is: electric current 410A; Voltage 49V; Primary gas (Ar) 46L / min; Secondary gas (H 2 ) 1.5L / min; powder feeding speed 32g / min; spraying distance 90mm; spraying speed 150mm / s, prepared WC P / NiCrBSi composite coating. WC P The erosion wear resistance rate of / NiCrBSi coating is 5.4×10 -3 mm 3 / g-5.8×10 -3 mm 3 / g; coating / substrate interface bonding strength is 26MPa-31MPa.

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Abstract

The invention relates to surface engineering technique in technical fields such as design materials, electrical power, metallurgy, machine and the like, in particular to a method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles. The metallic matrix composite coating reinforced with tungsten carbide ceramics particles (WCP / NiCrBSi) is prepared on the surface of mild steel base material based on the characteristics of high hardness, wear resistance, erosion resistance of the tungsten carbide ceramics material and fine self-fluxing nature, wettability and plasma spraying technology of the NiCrBSi alloy, and the property of wear and tarnish resistance is improved. The technique process of preparing WCP / NiCrBSi composite material coating is as follows: coating design; sifting dusty spray; mixing the powder according to certain ratio; superficial treatment of base material; controlling plasma spraying parameter; preparing WCP / NiCrBSi coating.

Description

technical field [0001] The invention belongs to surface engineering technology, and relates to technical fields such as materials, electric power, metallurgy, and machinery. Background technique [0002] Electric power industry is the pillar industry of national economy. Fly ash and slag produced by coal-fired boilers in thermal power plants account for about 1 / 5 of the coal consumption. The treatment of fly ash and slag has become an important production link of thermal power generation. There are two main methods of ash removal: one is to use a hydraulic ash removal system to clean and transport ash (referred to as water ash removal); the other is to use a pneumatic ash removal system to clean and transport ash (referred to as dry ash removal) . Because the dry ash removal system has the advantages of saving water resources, no pollution to the environment, and reusable ash residue, etc., thermal power plants in developed countries in foreign countries currently use dry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C23C4/12C23C4/06C23C4/134
Inventor 孙大千宫文彪韩耀武王文权宣兆志任振安谷晓燕
Owner JILIN UNIV
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