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Double-gradient heat-insulation anti-ablative coating and preparation method thereof

An anti-ablation, double-gradient technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of thermal shock resistance, oxidation resistance, and oxidation resistance. Problems such as not being improved, to achieve the effect of improving thermal shock resistance, reducing interlayer stress, and improving thermal shock resistance

Inactive Publication Date: 2019-02-15
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 1 (201510035085.1) provides a method for preparing gradient thermal barrier coatings, which mainly uses electroplating or electroless plating to coat alloy powder on the surface of nano-agglomerated ceramic particles, and combines them with metal by thermal spraying or laser cladding. On the surface of the substrate, the prepared nanogradient thermal barrier coating has good density and high bonding strength, but the oxidation resistance has not been improved
Patent 2 (201610302235.) provides a method for synchronous powder feeding to prepare a ceramic-based thermal barrier coating with a continuous gradient structure. The dual-feeding supersonic plasma spraying method is mainly used to prepare a ceramic coating with a continuous gradient composition and thermal barrier coating. It has very low interlayer stress, high thermal shock life and high thermal insulation performance, but the oxidation resistance has not been significantly improved
Patent 3 (201210283972.7) provides a method for preparing a new gradient thermal barrier coating. The bonding layer of the coating contains oxides that are easy to form oxide films, and the oxide content has a gradient change, and electron beam physical vapor deposition is used. The ceramic layer is prepared by the process, and the heat resistance and oxidation resistance of the thermal barrier coating are improved at the same time, but the thermal shock resistance is not significantly improved

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  • Double-gradient heat-insulation anti-ablative coating and preparation method thereof

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preparation example Construction

[0035] The second aspect of the present invention also provides a method for preparing the dual-gradient heat-insulating and anti-ablation coating 101, which includes the following steps: .

[0036] S01, pretreatment of the substrate 102, selecting one of alloy steel or superalloy as the substrate 102, and performing surface treatment on the workpiece to be sprayed;

[0037] S02, spraying powder pretreatment, spraying powder is two groups of materials A and B, group A material is alloy powder, which is one of NiCrAlY, CoCrAlY, NiCoCrAlY, NiCoCrAlYTa alloy, group B material is ceramic powder, which is partially stabilized by yttrium oxide Zirconia (Y 2 o 3 -ZrO 2 ), calcium oxide partially stabilized zirconia (CaO-ZrO 2 ), cerium oxide partially stabilized zirconia (CeO 2 -ZrO 2 ) and aluminum oxide (Al2O3); the alloy to be sprayed and the ceramic powder are dried in an oven; the optional implementation of this embodiment is that the alloy to be sprayed and the ceramic pow...

Embodiment 1

[0045] A dual-gradient heat-insulating and anti-ablation coating 101 provided in this embodiment and its preparation method are as follows.

[0046] 1. Substrate 102 pretreatment. Use organic solvents to clean the surface of the workpiece to remove oil and rust, and use sandblasting to roughen the surface of the sprayed workpiece after drying;

[0047] 2. Powder pretreatment. The metal alloy layer is NiCrAlY from 200 mesh to 325 mesh, and the ceramic layer is 8% Y from 200 mesh to 325 mesh 2 o 3 -ZrO 2 , the powder was dried at 80°C for 30min.

[0048] 3. Coating preparation.

[0049] The powder feeding rate of the first sublayer NiCrAlY powder is 5kg / h, 8%Y 2 o 3 -ZrO 2 The powder feeding rate is 0kg / h, the powder feeding pressure is 0.8MPa, the spraying power is 30kW, the spraying speed is 30mm / s, and the spraying distance is kept at 100mm;

[0050] The powder feeding rate of the second sublayer NiCrAlY powder is 3kg / h, 8%Y 2 o 3 -ZrO 2 The powder feeding rate is...

Embodiment 2

[0055] A dual-gradient heat-insulating and anti-ablation coating 101 provided in this embodiment and its preparation method are as follows.

[0056] 1. Substrate 102 pretreatment. Use organic solvents to clean the surface of the workpiece to remove oil and rust, and use sandblasting to roughen the surface of the sprayed workpiece after drying;

[0057] 2. Powder pretreatment. The metal alloy layer is 200 mesh to 325 mesh NiCoCrAlY, and the ceramic layer is 200 mesh to 325 mesh CeO 2 -ZrO 2 , the powder was dried at 80°C for 30min.

[0058] 3. Coating preparation.

[0059] The powder feeding rate of the first sublayer NiCoCrAlY powder is 6kg / h, CeO 2 -ZrO 2 The powder feeding rate is 0kg / h, the powder feeding pressure is 0.8MPa, the spraying power is 30kW, the spraying speed is 30mm / s, and the spraying distance is kept at 100mm;

[0060] The powder feeding rate of the second sublayer NiCoCrAlY powder is 5kg / h, CeO 2 -ZrO 2 The powder feeding rate is 1kg / h, the powder f...

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Abstract

The invention provides a double-gradient heat-insulation anti-ablative coating and a preparation method thereof, and relates to the technical field of high-temperature environment protection coatings.According to the double-gradient heat-insulation anti-ablative coating provided by the invention, the total thickness of the double-gradient heat-insulation anti-ablative coating is 200mum to 500mum;the double-gradient heat-insulation anti-ablative coating comprises multiple sublayers; the sublayers are provided with porosity structures and material compositions with gradient changes; the porosity of the first sublayer is less than or equal to 1 percent, and the coating material composition of the first sublayer is 100 percent of MCrAlYX; the porosity of the last sublayer is less than or equal to 30 percent, and the coating material composition of the last sublayer is 100 percent of M-ZrO2; the porosity and the coating material of the middle sublayer are in layer-by-layer transition; andthe coating material composition of the middle sublayer is a mixed layer of the MCrAlYX and the M-ZrO2. The invention relates to a coating preparation method. The coating is prepared by adopting a double-powder-feeding atmospheric plasma spraying technology, so that the resistance to heat shock, the oxidation resistance and the heat-insulating property of the heat-insulation anti-ablative coatingon the surface of a metal matrix are improved.

Description

technical field [0001] The invention relates to the technical field of high-temperature environment protective coatings, in particular to a preparation method of a heat-insulating and anti-ablation coating with the characteristics of a double-gradient structure. Background technique [0002] Heat-insulating and anti-ablation coatings have been widely used in hot-end parts of solid rocket motors, high-temperature turbine engines, etc. Oxidation, ablation, and impact damage to the base metal by cold and heat shocks can significantly increase the service life of components. [0003] The heat-insulating and anti-ablation coating on the surface of metal components generally includes a metal bonding layer (priming layer) and a surface ceramic layer, which form a classic double-layer structure. The commonly used material for the bonding layer is MCrAlYX (M=Ni, Co or NiCo; X=Si, Ta), and the commonly used material for the ceramic layer is M-ZrO 2 (M=Y 2 o 3 , MgO or CeO 2 ). C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/11
CPCC23C4/073C23C4/11C23C4/134
Inventor 吴护林丛大龙李忠盛何庆兵张敏赵子鹏宋凯强陈海涛
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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