Flame spray welding process for titanium alloy surface wearable coating

A wear-resistant coating, flame spray welding technology, applied in metal material coating process, coating, melting spray plating and other directions, can solve the problems of large residual stress, difficult bonding performance, and fast cooling speed of spray welding layer, etc. Achieve the effect of stable coating structure, excellent bonding performance and reducing residual stress

Inactive Publication Date: 2005-04-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no report on the preparation of wear-resistant coatings by spray welding self-fluxing alloy powder on the surface of titanium alloys by flame spray welding technology. The main reasons for the above situation are as follows: (1) the surface activity of titanium alloys is relatively high, and Oxygen has a strong affinity, and the B and Si elements in the self-fluxing alloy powder cannot reduce them. It is difficult to obtain a clean surface during flame spray welding. Therefore, it is generally considered that flame spray welding technology is not suitable for titanium alloy substrates. Surface modification; (2) During the flame spray welding process, the temperature is high and the cooling rate of the spray welding layer is fast, the diffusion of alloy elements cannot be fully carried out, and the residual stress is large, which weakens the bond between the titanium alloy substrate and the coating strength, it is difficult to obtain good bonding properties

Method used

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  • Flame spray welding process for titanium alloy surface wearable coating
  • Flame spray welding process for titanium alloy surface wearable coating
  • Flame spray welding process for titanium alloy surface wearable coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1. the workpiece surface is carried out sandblasting coarsening, makes the roughness of the surface to be sprayed reach Ra25, then with acetone ultrasonic cleaning 3~5 minutes, put into the solution prepared with hydrochloric acid, nitric acid, hydrofluoric acid and distilled water and soak Then place it in an activation solution of 30ml / L hydrofluoric acid and 30g / L zinc sulfate hexahydrate to activate until the surface of the workpiece is completely covered with dark gray zinc film; preheat the pretreated workpiece to 230°C and then spray Protective layer, secondary heating, spraying alloy powder, and remelting spray coating to control the coating alloy to stay in the liquid state for 20 seconds, then slowly cool to room temperature; then reheat it to 200°C, keep it for 30 minutes, and perform "tempering" heat treatment.

[0027] The interface area of ​​the wear-resistant coating prepared by the above process and the microstructure and morphology of the spr...

Embodiment 2

[0028] Embodiment 2. the workpiece surface is carried out sandblasting coarsening, makes the roughness of surface to be sprayed reach Ra25, then cleans with acetone ultrasonic wave 3~5 minutes, puts into the solution prepared with hydrochloric acid, nitric acid, hydrofluoric acid and distilled water and soaks Then place it in an activation solution of 45ml / L hydrofluoric acid and 40g / L zinc sulfate hexahydrate to activate until the surface of the workpiece is completely covered with dark gray zinc film; preheat the pretreated workpiece to 250°C and then spray Protective layer, secondary heating, spraying alloy powder, and remelting spray coating to control the coating alloy to stay in the liquid state for 40 seconds, and then slowly cool to room temperature; then reheat it to 400°C, keep it for 60 minutes, and perform "tempering" heat treatment.

[0029] The interface area of ​​the wear-resistant coating prepared by the above process and the microstructure and morphology of th...

Embodiment 3

[0030] Embodiment 3. The surface of the workpiece is threaded so that the roughness of the surface to be sprayed reaches Ra12.5, then ultrasonically cleaned with acetone for 3 to 5 minutes, and then etched in a solution prepared with hydrochloric acid, nitric acid, hydrofluoric acid and distilled water , and then put it in an activation solution of 55ml / L hydrofluoric acid and 50g / L zinc sulfate hexahydrate to activate until the surface of the workpiece is completely covered with dark gray zinc film; preheat the pretreated workpiece to 270°C and then spray it for protection Layer, secondary heating, spray alloy powder, and remelt spray coating to control the coating alloy to stay in the liquid state for 60 seconds, then slowly cool to room temperature; then reheat it to 600 ° C, keep it for 120 minutes, and perform "tempering" heat treatment .

[0031] The interface area of ​​the wear-resistant coating prepared by the above process and the microstructure and morphology of the ...

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Abstract

One kind of titanium alloy surface wear-resisting coating flame spurts welds the technique, this craft through increases the surface in the superficial pretreatment craft to soak the zinc activation working procedure, and gater two into one, the surface decontamination working procedure with it; Simultaneously had reasonably determined in the technological process essential parameter, is concrete is: Treats spurts the surface roughness is Ra25~~12.5, the preheating temperature is 230~~270deg.C, when heavy melt the liquid state resident time is 20~~60S; And after spurts welds carries on 'to it the tempering' heat treatment, the heat treatment temperature range is 200~~600deg.C, guarantees the wet time is 0.5~~2H and so on a series of crafts measure, successfully brings to completion in the titanium alloy surface preparation gathers the performance fine flame to spurt welds the wear-resisting coating, better solution project practice implementation flexible question.

Description

technical field [0001] The invention relates to the technical field of metal surface thermal spraying (welding), in particular to a flame spraying welding process method of a titanium alloy surface wear-resistant coating. Background technique [0002] Titanium alloy has high specific strength, strong corrosion resistance, good processability and biocompatibility, and has always been one of the main metal materials used in military fields such as aerospace. With the deepening of titanium alloys from military use to civilian use, titanium alloys have shown great application potential in the fields of marine, energy and chemical engineering, vehicle engineering, biomedicine, etc., and have become a new technology, new technology, and new equipment in these fields. One of the indispensable metal materials. But it also has the disadvantages of low hardness, high coefficient of friction, and poor wear resistance, which seriously affect its performance and limit its further applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/02C23C4/08C23C4/129C23C4/18
Inventor 许晓静王宏宇陈康敏
Owner JIANGSU UNIV
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