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Process for reacting and spraying metal titanium and cobalt with mixed thermal spraying powder of boron carbide

A technology of spraying metal and spraying powder, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., which can solve the problems of poor coating performance and achieve the effect of improved coating wear resistance and simple process flow

Inactive Publication Date: 2009-10-28
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of poor performance of the coating obtained by reactive spraying after metal and ceramic powders are mixed and sprayed and granulated. By designing the spraying current, ion gas H 2 Flow rate, powder feeding amount and spraying distance, the optimal reaction spraying process is obtained by taking the wear resistance of the coating as the measurement index, and the wear resistance of the coating obtained by this process is improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Spraying sample preparation: use medium carbon steel as the base material, wire-cut it into a disc with a diameter of 40 mm and a thickness of 3 mm, clean the surface with acetone, and wet-grind it with 800-mesh silica water sandpaper for 10 minutes, and then blow it with a hair dryer. dry surface;

[0023] (2) Fix the sample with a fixture, first turn on the power of the plasma equipment, preheat the substrate with a plasma flame, and make the substrate temperature reach 250°C, then turn on the switch of the powder feeder, spray the bonding layer, and then spray the MCrAlY bonding layer, 50 microns thick;

[0024] (3) Remove the sample that has been sprayed with the adhesive layer, and put it in a vacuum carbon tube furnace at 900°C for 10 hours of vacuum heat treatment under the protective atmosphere of argon, so that the alloy material of the adhesive layer can be diffused evenly. Take out after cooling;

[0025] (4) Adjust equipment parameters: put 100g reacti...

Embodiment 2

[0029] (1) Spraying sample preparation: choose medium carbon steel as the base material, wire-cut it into a disc with a diameter of 40mm and a thickness of 3mm, clean the surface with acetone, and wet-grind it with 800-mesh silica water sandpaper for 30 minutes, and then blow it with a hair dryer. dry surface;

[0030] (2) Fix the sample with a fixture, first turn on the power of the plasma equipment, preheat the substrate with a plasma flame, and make the substrate temperature reach 350°C, then turn on the switch of the powder feeder, spray the bonding layer, and then spray the MCrAlY bonding layer, 80 microns thick;

[0031] (3) Remove the sample that has been sprayed with the adhesive layer, and put it in a vacuum carbon tube furnace for 24 hours at 1000°C under a protective atmosphere of argon to make the alloy material of the adhesive layer diffuse evenly. Take out after cooling;

[0032] (4) Adjust equipment parameters: put 100g reaction spray mixed thermal spray powde...

Embodiment 3

[0036] (1) Spraying sample preparation: use medium carbon steel as the base material, wire-cut it into a disc with a diameter of 40 mm and a thickness of 3 mm, clean it with acetone, and then wet-grind it with 800-mesh silica water sandpaper for 20 minutes, and then blow it with a hair dryer. dry surface;

[0037] (2) Fix the sample with a fixture, first turn on the power of the plasma equipment, preheat the substrate with a plasma flame, and make the substrate temperature reach 300°C, then turn on the switch of the powder feeder, spray the bonding layer, and then spray the MCrAlY bonding layer, 60 microns thick;

[0038] (3) Remove the sample that has been sprayed with the adhesive layer, and put it into a vacuum carbon tube furnace at 950°C for 20 hours of vacuum heat treatment under the protective atmosphere of argon, so that the alloy material of the adhesive layer can be diffused evenly. Take out after cooling;

[0039] (4) Adjust equipment parameters: put 100g reaction...

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PUM

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Abstract

The invention discloses a thermal spraying powder method for reactive spraying metal titanium, cobalt and boron carbide mixed thermal spraying powder in the field of thermal spraying technology. First, the substrate is cut into a wear-resistant test standard sample, oil and rust are removed before spraying, and the substrate is preheated and then sprayed. adhesive layer. Then carry out the vacuum heat treatment of the bonding layer, put the reactive spraying thermal spraying powder into the powder feeder, and then adjust the current of the plasma equipment to 500A-600A, the flow rate of ion gas H2 to 20L / h-40L / h, and the powder feeding volume to 15r / min-25r / min, the spraying distance is 100mm-160mm, reactive spraying is carried out on the heat-treated sample; finally, the coating is subjected to atmospheric heat treatment. The invention solves the problem of poor performance of the coating obtained by reaction spraying after metal and ceramic powders are mixed and sprayed and granulated, has the advantages of simple process flow, and improves the wear resistance of the coating obtained by spraying the optimized process.

Description

technical field [0001] The invention relates to a method in the technical field of thermal spraying, in particular to a method for reactive spraying metal titanium, cobalt and boron carbide mixed thermal spraying powder. Background technique [0002] As a surface modification technology, thermal spraying, depending on the selected material and spraying method, the obtained coating has wear resistance, oxidation resistance, electrical conductivity and resistance, resistance to atmospheric and molten metal immersion corrosion, chemical corrosion resistance, insulation Functions such as high temperature resistance, recovery size, and gap control between parts. It is widely used in aerospace, metallurgy, electric power, machinery and many other fields, and has developed rapidly in recent years. The quality of thermal spray coating is closely related to the thermal spray process parameters used. The current, hydrogen flow rate, powder feeding amount and spraying distance used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04
Inventor 马静毛正平孙宝德王俊
Owner SHANGHAI JIAOTONG UNIV
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