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Method for eliminating porosity of sprayed coating

A technology of porosity and coating, which is applied in the field of spray coating sealing holes, can solve the problems of lack of pores inside the coating and affect the long-term application performance of the coating, so as to improve the comprehensive mechanical properties, high energy utilization rate and prolong the service life Effect

Active Publication Date: 2017-02-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sealing treatment is to use the sealing agent to soak the pores to fill the pores, but most of the sealing treatment can only treat the pores on the surface of the coating, and lack the necessary treatment for the internal pores of the coating, which affects the long-term application performance of the coating

Method used

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  • Method for eliminating porosity of sprayed coating
  • Method for eliminating porosity of sprayed coating
  • Method for eliminating porosity of sprayed coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Select pure aluminum wire with a diameter of 2.0 mm, and install the wire on the arc spraying equipment.

[0027] (2) The process parameters are as follows: argon is used as the spraying atmosphere, the atomization pressure is 0.8MPa; the spraying voltage is 32V; the spraying current is 180A; the spraying distance is 180mm; the deposition rate is 128g / min; the coating thickness is 200μm.

[0028] (3) Put the prepared coating into the electromagnetic induction heating equipment and heat the temperature to 500°C.

[0029] (4) Start the roll machine to make the coating pass through the roll at a constant speed, with a reduction of 15 μm.

[0030] (5) Cool with the furnace after holding the heat for 50 minutes; at this time, the porosity of the coating will drop to zero.

Embodiment 2

[0032] (1) Select pure zinc wire with a diameter of 2.2 mm, and install the wire on the arc spraying equipment.

[0033] (2) Argon is used as the spraying atmosphere, the atomization pressure is 0.7MPa; the spraying voltage is 32V; the spraying current is 180A; the spraying distance is 180mm; the deposition rate is 130g / min; the coating thickness is 300μm. The coating porosity is 14%.

[0034] (3) Put the prepared coating into the electromagnetic induction heating equipment and heat the temperature to 380°C.

[0035] (4) Start the roll machine to make the coating pass through the roll at a constant speed, with a reduction of 40 μm.

[0036] (5) After 60 minutes of heat preservation, cool with the furnace; at this time, the porosity of the coating will drop to zero.

Embodiment 3

[0038] (1) Select a nickel-aluminum alloy wire with a diameter of 2.5 mm and install it on the arc spraying equipment.

[0039] (2) Argon is used as the spraying atmosphere, the atomization pressure is 0.6MPa; the spraying voltage is 32V; the spraying current is 180A; the spraying distance is 150mm; the deposition rate is 135g / min; the coating thickness is 250μm. The coating porosity is 15%.

[0040] (3) Put the prepared coating into the electromagnetic induction heating equipment, and heat the temperature to 300°C (to make the coating reach a molten or semi-molten state.

[0041] (4) Start the roll machine to make the coating pass through the roll at a constant speed, with a reduction of 37 μm.

[0042] (5) After 60 minutes of heat preservation, cool with the furnace; at this time, the porosity of the coating will drop to zero.

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Abstract

The invention provides a method for eliminating the porosity of a sprayed coating and belongs to the technical field of sprayed coating hole sealing. According to the method, a spraying substrate is heated through an electromagnetic induction heating principle, and the coating is heated through substrate heat conduction; or the coating is heated directly through electromagnetic induction, when the temperature of the coating reaches 40%-90% of the melting point, pressure is exerted on the surface of the coating, the porosity of the coating is eliminated, and the compactness of the coating is improved, wherein the melting point of a coating material is lower than the melting point of the substrate. Through the principle that the spraying technology is used for preparing the coating, the coating can have a certain porosity, while existing methods cannot effectively eliminate the porosity of the coating. With the technology of the method, the pressure is exerted on the coating while electromagnetic induction heating is conducted, the porosity can be eliminated, the comprehensive mechanical properties of the coating can be improved, thus the life of the coating is prolonged, and the work efficiency of the coating is improved.

Description

technical field [0001] The invention discloses a method for eliminating the porosity of a spray coating, which belongs to the technical field of spray coating sealing. Background technique [0002] Spraying is a surface strengthening technology and an important part of surface engineering technology. The principle of spraying coating preparation determines that it is a deposition layer formed by interlaced stacking of tiny particles. , so there will be voids in the process of forming the coating, and the coating will have a certain degree of porosity, and some pores even extend from the surface of the coating to the surface of the substrate. The porosity of the coating is 1%~30%. These pores are harmful to anti-corrosion and other applications. For example, the corrosive medium penetrates the pores to reach the surface of the protected substrate. The accumulation of corrosion products at the interface will cause the thermal spray coating to crack and fall off. Therefore, th...

Claims

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Application Information

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IPC IPC(8): C23C4/18
CPCC23C4/18
Inventor 宋鹏陈昆伦李超陆建生刘光亮
Owner KUNMING UNIV OF SCI & TECH
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