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A method for improving microstructure of coating

A microstructure and coating technology, which is applied in coatings, devices for coating liquids on surfaces, pretreatment of surfaces, etc., can solve problems such as difficulty in exerting the inherent excellent properties of coating materials, low bonding strength, and coating failure , to achieve the effects of decreased porosity, improved coating performance, and simple method

Active Publication Date: 2021-01-29
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned components have higher and higher requirements on the service life of the coating. The traditional thermal spray coating that has been used for many years in conventional thermal power and hydropower equipment is difficult to meet the needs of power development.
[0003]The traditional thermal spray coating is essentially a layered structure deposit formed by the stacking of molten metal or ceramic flat particles, and there are a large number of unbonded interfaces between layers ( Conventional plasma spraying ceramics is as high as 70% of the interface is unbonded), and at the same time, there are still a large number of unbonded interfaces in the metal coating during the preparation process, which can form pores penetrating to the substrate in the coating, and the corrosive medium in the service environment is easy Directly reaching the substrate along the through pores cannot provide effective physical shielding for the substrate; under mechanical effects such as water erosion, cavitation and abrasion, the coating peels off one by one in units of single flat particles, resulting in rapid thinning of the coating
On the other hand, since the thermal spray coating is mechanically bonded to the substrate, the bonding strength is relatively low, usually not higher than 70MPa. Repeated vibrations of components, water erosion, cavitation and other high-stress mechanical actions may cause partial or even damage to the coating. It is the overall peeling off, which causes the rapid failure of the coating, and it is difficult to exert the intrinsic excellent characteristics of the coating material

Method used

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  • A method for improving microstructure of coating
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  • A method for improving microstructure of coating

Examples

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Effect test

Embodiment 1

[0031] Aerosolized spherical Inconel powder was used as spray powder (AMPERIT380, HC Starck GmbH), with a particle size of 15-45 μm. TP347H heat-resistant steel (1Cr19Ni11Nb) was used as the substrate, and 16-mesh white corundum sand was used for sandblasting before spraying under the condition of compressed air pressure of 0.8MPa. Using M3 TM The -type HVAF spraying system (Uniquecoat, USA) prepared the coating under the parameters shown in Table 1. Before spraying, preheat the substrate to 350°C and start spraying the coating. During the spraying process, the substrate remains heated at 350°C. After spraying one layer on the surface of the substrate, laser shock strengthening is carried out on the surface of the deposited coating. The parameters of laser shock strengthening are: the laser power density is 0.6GW / cm 2 , the pulse frequency is 5Hz. After the laser shock, continue to the next spraying and laser shock strengthening treatment, and the parameters of each sprayin...

Embodiment 2

[0035] TP347H heat-resistant steel (1Cr19Ni11Nb) was used as the substrate, and 16-mesh white corundum sand was used for sandblasting before spraying under the condition of compressed air pressure of 0.8MPa. The smelted and crushed 8YSZ ceramic powder was selected, and the ceramic coating was prepared by using the APS spraying technology under the spraying parameter conditions shown in Table 2. Before spraying, preheat the substrate to 700°C and start spraying the coating. During the spraying process, the substrate remains heated at 700°C. After the surface of the substrate is sprayed once, the surface of the deposited coating is shot peened, and the shot peening is made of ceramic pellets (the chemical composition of which is roughly 67% ZrO 2 , 31% SiO 2 and 2% Al 2 o 3 The main inclusions are made by melting, atomization, drying, round selection, and screening), and the working pressure of ceramic pellets is 0.5MPa. After shot peening, continue to the next spraying and ...

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Abstract

The invention discloses a method for improving a microstructure of a coating. Before spraying, heating the back surface of a base material to a certain temperature (the heating temperature of the backsurface of a ceramic powder spraying base material is 600 DEG C to 700 DEG C, and the heating temperature of the back surface of a metal powder spraying base material is 350 DEG C to 450 DEG C). In the spraying process, heating of the back face of the base material is kept all the time, and meanwhile the surface of the deposited coating is subjected to strengthening treatment (shot blasting strengthening can be adopted for ceramic powder spraying, and laser shock strengthening can be adopted for metal powder spraying). The steps are repeated until the coating reaches a certain thickness, andthen spraying is stopped. The microstructure of the coating is improved by heating the back surface of the base material to a constant temperature and carrying out impact strengthening on the surfaceof the deposited coating in the spraying process, and the method is simple and high in operability. Compared with a coating microstructure prepared by a traditional method, the improved coating microstructure is compact, the porosity is reduced, the layered structure partially disappears, and the performance of the coating is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method for improving the microstructure of the coating. Background technique [0002] In recent years, with the optimization of my country's power structure, the development of operating technologies such as deep peak shaving, quality improvement and efficiency enhancement, advanced power generation technology and the construction of large-scale power stations, power equipment is facing new and harsher working conditions. Thermal power generation, nuclear power steam turbines, pumps and other flow components, head water turbine flow components, power station fluid pipelines and other equipment are subjected to coupling effects of various harsh conditions such as water erosion, cavitation, and wear during service, and the damage speed and degree are increasing. serious. The above-mentioned components have higher and higher requirements on the service lif...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D3/12B05D3/02B05D1/02B05D1/38
CPCB05D5/00B05D3/12B05D3/02B05D1/02B05D1/38
Inventor 杨二娟刘福广米紫昊李勇刘刚王博王艳松韩天鹏杨兰
Owner XIAN THERMAL POWER RES INST CO LTD
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