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Auxiliary heating device, plasma spraying device and spraying method

An auxiliary heating and plasma technology, applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of increased spraying time, workpiece cooling, and increased number of times, and achieve the effect of improving performance and precise temperature control

Active Publication Date: 2020-11-03
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-pressure plasma spraying is operated in a vacuum chamber. Due to the low pressure of the working environment and the extremely thin atmosphere during the spraying process, the heating efficiency of the plasma jet to purge the substrate is not high.
Especially when spraying large-sized and complex-shaped workpieces, the large size will lead to serious radiation and heat dissipation. The complex shape of the workpiece will increase the number of robot program conversions, spray trajectory changes, and spray gun attitude changes and increase the spraying time, which leads to cooling of the workpiece. serious
In the end, because the required workpiece preheating temperature cannot be achieved or the temperature control of the workpiece during the spraying process cannot be achieved, serious problems such as poor coating performance and uncontrollable quality stability

Method used

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  • Auxiliary heating device, plasma spraying device and spraying method
  • Auxiliary heating device, plasma spraying device and spraying method
  • Auxiliary heating device, plasma spraying device and spraying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Please refer to Figure 1-6 , In this embodiment, the auxiliary heating device 7 is used for auxiliary heating and temperature control in the low-pressure plasma spraying vacuum chamber of GTV Company in Germany.

[0055] The workpiece 5 to be sprayed is a cylindrical sample of Ф16mm×80mm, the material is 316L stainless steel, and it is clamped on the rotating shaft at the center of the working platform 4. During the spraying process, in order to keep the heating and coating deposition uniform, it rotates at a speed of 50 rpm . The auxiliary heating device 7 is placed on the working platform 4 and fixed by screws. The workpiece 5 to be sprayed, the working platform 4 and the auxiliary heating device 7 are installed at one end of the low-pressure plasma spraying vacuum chamber, and the plasma spraying gun 2 is installed at the other end of the low-pressure plasma spraying vacuum chamber.

[0056] The position of the heating plate 8 is adjusted, placed on both sides of ...

Embodiment 2

[0059] Please refer to Figure 1-6 , In this embodiment, the auxiliary heating device 7 is used for auxiliary heating and temperature control in the low-pressure plasma spraying vacuum chamber of Oerlikon-Metco, Switzerland.

[0060] The workpiece 5 to be sprayed is an engine blade simulation part of 170mm (height) × 70mm (width) × 60mm (height), made of 316L stainless steel, and clamped on the rotating shaft at the center of the working platform 4 . During the spraying process, in order to keep the heating and coating deposition uniform, it rotates at a speed of 40 rpm. The substrate auxiliary heating device 7 is placed on the working platform 4 and fixed by screws. The workpiece 5 to be sprayed, the working platform 4 and the auxiliary heating device 7 are installed at one end of the low-pressure plasma spraying vacuum chamber, and the plasma spraying gun 2 is installed at the other end of the low-pressure plasma spraying vacuum chamber.

[0061] The position of the heatin...

Embodiment 3

[0064] Please refer to Figure 1-6 , In this embodiment, the auxiliary heating device 7 is used for auxiliary heating and temperature control in the low-pressure plasma spraying vacuum chamber of Oerlikon-Metco, Switzerland.

[0065] The workpiece 5 to be sprayed is a ground gas turbine blade of 275 mm (height) × 115 mm (width) × 130 mm (height), made of Inconel 718 alloy, and clamped on the rotating shaft at the center of the working platform 4 . During the spraying process, in order to maintain uniform heating and coating deposition, it rotates at a speed of 20 rpm. The auxiliary heating device 7 is placed on the working platform 4 and fixed by screws. The workpiece 5 to be sprayed, the working platform 4 and the auxiliary heating device 7 are installed at one end of the low-pressure plasma spraying vacuum chamber, and the plasma spraying gun 2 is installed at the other end of the low-pressure plasma spraying vacuum chamber.

[0066] The position of the heating plate 8 is ...

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Abstract

The invention discloses an auxiliary heating device, a plasma spraying device and a spraying method, and relates to the technical field of material surface engineering. The auxiliary heating device isused for being installed on a working platform at the end, away from a plasma spraying gun, of a plasma spraying cabin and comprises a heating plate, a controller and a temperature detector used fordetecting the temperature of a to-be-sprayed workpiece, and the heating plate is used for being installed on the working platform so as to heat the to-be-sprayed workpiece on the working platform. Theheating plate and the temperature detector are electrically connected with the controller. The heating plate is used for preheating the to-be-sprayed workpiece before spraying, and the heating plateis used for supplementing heat to the to-be-sprayed workpiece in the spraying process, so that temperature control is achieved more accurately, and the performance, such as the tensile bonding strength and the anti-scouring performance, of a sprayed coating can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of material surface engineering, and in particular to an auxiliary heating device, a plasma spraying device and a spraying method. Background technique [0002] Thermal spraying technology is one of the key technologies of modern material surface engineering. It is a method of sending coating materials (powder or wire) into a certain heat source (which can be electric arc, combustion flame, plasma, etc.) to melt, and using high-speed The process in which the airflow sprays it onto the surface of the base material to form a coating. In order to increase the bonding force between the coating and the substrate material and control the internal structure of the coating, the substrate (or workpiece) needs to be heated to a certain temperature before spraying, that is, the spraying starts after reaching the preset temperature of the substrate. At present, the substrate preheating method uses multiple sweeps of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134
CPCC23C4/134
Inventor 毛杰刘敏邓畅光邓春明宋进兵杨焜邓子谦张小锋牛少鹏戴红亮
Owner GUANGDONG INST OF NEW MATERIALS