Explosive painting process of preparing heat barrier coating

A technology of explosive spraying and thermal barrier coating, which is used in coatings, metal material coating processes, devices for coating liquids on surfaces, etc. problem, to achieve the effect of low cost, high deposition rate and good bonding

Inactive Publication Date: 2003-05-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: due to the operation under vacuum conditions, the process is complex, the cost is high, and the deposition speed is low, it is not easy to deposit a thick coating
In addition, explosive spraying is also a thermal spraying technology for preparing coatings. Due to the large impact force of powder particles on the substrate during explosive spraying, intermittent explosive spraying inhibits the temperature rise of the substrate, so that the obtained coating has high hardness. Combining the advantages of good strength and less pores in the coating, it is low in cost and easy to operate. However, compared with plasma spraying, the flame temperature of detonation spraying is relatively low, and it is not easy to melt when spraying zirconia ceramic layer with high melting point. Therefore, detonation spraying is used. The method of preparing thermal barrier coating by spraying has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The base material is superalloy M38G, and the sample size is 15×25×5mm 3 . Before spraying, the samples were cleaned and sandblasted (Al 2 o 3 , 28 mesh). Using a two-dimensional workbench, six-sided explosive spraying was carried out on the sample. The prepared thermal barrier coating consists of two parts: an anti-oxidation connection layer and an insulating ceramic layer as a surface layer. The connection layer is made of Ni-25Cr-5Al-0.5Y, ZrO 2 -8Y 2 o 3 For the ceramic layer material, the temperature of the substrate is controlled to be less than 150°C. This embodiment is a thermal barrier coating with a double-layer structure. The technical parameters of the explosive spraying are shown in Table 1, and the composition and thickness parameters are shown in Table 2.

[0015] Table 1 embodiment 1 detonation spraying process parameter

[0016] Process parameters Ni-25Cr-5Al-0.5Y ZrO 2 -8Y 2 o 3

[0017] Working frequency 4shots / s 4shots / s

...

Embodiment 2

[0029] Substrate composition and size are the same as embodiment 1. First, clean and sandblast the sample, and then prepare a thermal barrier coating with a gradient structure. In this example, the MCrAlY alloy system of the connection layer uses Ni-25Cr-5Al-0.5Y, and the insulating ceramic layer is ZrO 2 -8Y 2 o 3 Material, a transition layer is added between the connection layer and the ceramic layer, the transition layer is composed of two components of the connection layer and the ceramic layer, specifically: the first transition layer adopts 75% Ni-25Cr-5Al-0.5Y by weight percentage Tie layer and 25% zirconia ceramic layer ZrO 2 -8Y 2 o 3 , the second transition layer adopts 50% Ni-25Cr-5Al-0.5Y connection layer and 50% zirconia ceramic layer ZrO by weight percentage 2 -8Y 2 o 3 , the third transition layer adopts 25% Ni-25Cr-5Al-0.5Y connection layer and 75% zirconia ceramic layer ZrO by weight percentage 2 -8Y 2 o 3 , obtain a thermal barrier coating with a gr...

Embodiment 3

[0047] The base material is Ni 3 Al-based alloy IC-6, the sample size is 15×25×2mm 3 . Before spraying, the samples were cleaned and sandblasted (Al 2 o 3 , 28 mesh). A thermal barrier coating with a double-layer structure is prepared. The connecting layer adopts the Co-29Cr-6Al-1Y alloy system. In order to improve the thermal insulation effect of the coating, the ceramic layer ZrO 2 -8Y 2 o 3 The thickness is 900 μm. Control the substrate temperature to less than 200°C. The prepared thick ceramic layer has no peeling phenomenon, and there are regular longitudinally distributed microcracks in the ceramic layer, which is beneficial to improve the thermal shock resistance of TBCs. The parameters of the explosive spraying process are shown in Table 5, and the composition and thickness parameters are shown in Table 6.

[0048] Table 5 embodiment 3 explosive spraying process parameters

[0049] Process parameters Co-29Cr-6Al-1Y ZrO 2 -8Y 2 o 3

[0050]...

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Abstract

The present invention is explosive coating process of preparing heat barrier coatings. Of the coating, the connecting layer comprises MCrAlY alloy system, where M is Ni and / or Co; and the ceramic layer has the ZrO2-8Y2O3 components. The specific operations include hexahedral explosive coating controlling the base material temperature at 100-200 deg.c, coating the connecting layer and the ceramic layer successively to obtain the heat barrier coatings. The specific operation parameters for forming the connecting layer and the ceramic layer are provided. Between the connecting layer and the ceramic layer, one transition layer including two components of both connecting layer and ceramic layer may be increased. The present invention may obtain completely antioxidant coatings with high hardness and high heat insulating effect.

Description

technical field [0001] The invention relates to a coating preparation technology, in particular to a method for preparing a thermal barrier coating by detonation spraying. Background technique [0002] The use of Thermal Barrier Coatings (TBCs) on gas turbine components can reduce the transfer of heat from gas to metal parts and reduce the operating temperature of metal parts. The thermal barrier coating is composed of MCrAlY (M=Ni, Co, Ni+Co,) connecting layer and ZrO 2 -Y 2 o 3 Composition of zirconia ceramic surface layer. At present, the main preparation methods of thermal barrier coatings are plasma spraying and electron beam physical vapor deposition (EB-PVD). Among them, plasma spraying uses a non-transferred arc as a heat source to heat the sprayed material to a molten or highly plastic state, and along with the plasma arc flame flow, hits and deposits on the surface of the workpiece at high speed to form a coating. Although the cost of plasma spraying is low an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05B7/14B05B7/16B05B7/20B05B17/00B05D1/10B05D1/36C23C4/073C23C4/11C23C4/126
Inventor 孙超武颖娜华伟刚闻立时宫骏于宝海王福会肖金泉王铁钢杜昊
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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