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A preparation method of a thermal barrier coating containing a double-layer structural bonding layer

A technology of thermal barrier coating and double-layer structure, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problems of low porosity and coating thermal conductivity, and reach the service temperature High, anti-diffusion, high operating temperature effect

Inactive Publication Date: 2017-08-25
HENAN PULAIMU COATING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent application is aimed at the preparation of functionally graded thermal barrier coatings, the coatings prepared by this method will inevitably reduce the thermal conductivity of the coating due to the low porosity and the simultaneous mixing of metal particles with high thermal conductivity
And double-layer or multi-layer structure bonding layer is then not seen in the report

Method used

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  • A preparation method of a thermal barrier coating containing a double-layer structural bonding layer
  • A preparation method of a thermal barrier coating containing a double-layer structural bonding layer
  • A preparation method of a thermal barrier coating containing a double-layer structural bonding layer

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preparation example Construction

[0032] A preparation method of a thermal barrier coating containing a double-layer structure adhesive layer, using the following steps:

[0033] (1) Degrease and sandblast the metal substrate in turn;

[0034] (2) by low-pressure plasma spraying, high-speed oxygen flame spraying or high-speed compressed air flame spraying on the metal substrate to prepare the first bonding layer with the composition NiCoCrAlY;

[0035] (3) prepare the second bonding layer of FeCrAlY on the first bonding layer by atmospheric plasma spraying, high-speed oxygen flame spraying or high-speed compressed air flame spraying;

[0036] (4) The ceramic layer is deposited on the double-layer adhesive layer by atmospheric plasma spraying, high-speed oxygen flame spraying, solution plasma spraying or electron beam physical vapor deposition technology, and the composition of the ceramic layer is 6-8wt% Y 2 O 3 Stable ZrO 2 or RE 2 Zr 2 O 7 , where RE is a rare earth element.

[0037]The sandblasting p...

Embodiment 1

[0045] A preparation method of a thermal barrier coating containing a double-layer structure adhesive layer, using the following steps:

[0046] (1) First, use Al with a particle size of 16 to 120 meshes for the metal substrate 1 2 O 3 , sandblast the substrate to obtain uniform surface roughness;

[0047] (2) When using low-pressure plasma spraying in step (2), the distance between the spray gun and the metal substrate is 100-250 mm, the moving speed of the spray gun is 300-1000 mm / s, the powder feeding rate is 10-70 g / min, and the powder feeding air flow is 0.5~1.2L / min, the voltage range is 100~180V, the spraying current range is 200~250A, and the vacuum degree is less than 20KPa. A first bonding layer 2 is introduced on the metal substrate 1. The composition of the bonding layer is NiCoCrAlY. In this method, the ceramic particles are heated and melted or semi-melted by a high-temperature plasma beam, and then quickly sprayed onto the surface of the substrate to form a la...

Embodiment 2

[0052] A preparation method of a thermal barrier coating containing a double-layer structure adhesive layer, using the following steps:

[0053] (1) Degrease and sandblast the metal substrate in turn. The sandblasting pressure used in the sandblasting treatment is 0.1MPa, and the main component of the sandblasting particles is Al. 2 O 3 , the particle size is 16 meshes;

[0054] (2) The first bonding layer composed of NiCoCrAlY was prepared on the metal substrate by low-pressure plasma spraying. During low-pressure plasma spraying, the distance between the spray gun and the metal substrate was 100 mm, the moving speed of the spray gun was 300 mm / s, and the powder feeding rate was 10 g / s min, the powder feeding airflow is 0.5L / min, the voltage range is 100V, the spray current range is 200A, and the vacuum degree is less than 20KPa;

[0055] (3) depositing a second adhesive layer on the first adhesive layer by atmospheric plasma spraying, and the composition of the adhesive la...

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Abstract

The invention relates to a preparation method of a thermal barrier coating containing a bilayer structure of bonding layers. A metal substrate is subjected to deoiling and sand blasting treatment; a first bonding layer is deposited on the metal substrate through low-pressure plasma spraying, high-velocity oxygen flame spraying or high-velocity compressed air flame spraying; a second bonding layer is deposited through atmosphere plasma spraying, high-velocity oxygen flame spraying or high-velocity compressed air flame spraying; a ceramic thermal insulating layer is deposited on the second bonding layer through atmosphere plasma spraying, high-velocity oxygen flame spraying, solution plasma spraying or an electron beam physical vapor deposition technology. Compared with conventional MCrAlY thermal barrier coating adopting a single bonding layer, M is Ni, Cr and the like, the prepared thermal barrier coating adopting the double bonding layers has higher use temperature, Ni2Al2O4 fragility phase is avoided for the interfacial properties of the bonding layers and the ceramic layer, sufficient Al is supplied, roughness of an interface is kept, the coating has more excellent oxidation resistance and organization structure stability, and the service life of the coating is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of thermal barrier coatings, in particular to a preparation method of a thermal barrier coating containing a double-layer structure adhesive layer. Background technique [0002] Thermal barrier coating usually refers to a ceramic coating deposited on the metal surface with good thermal insulation effect. It is a coating system composed of a bonding layer with high temperature oxidation resistance and a ceramic layer with thermal insulation effect. It is of great significance to ensure the long-term service of hot-end components such as gas turbines and engines, and the bonding layer is an important part of the thermal barrier coating, and its performance directly affects the life of the thermal barrier coating system. [0003] At present, the main components of the bonding layer are MCrAlY (M is Ni, Co or Ni+Co) and (Ni, Pt) Al. Among ground gas turbines, MCrAlY (M=Ni, Co) is the most commonly used, and its operating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C4/11C23C4/073C23C4/129C23C4/134
CPCC23C4/10C23C28/3215
Inventor 陈文夫周新义郭芳威赵晓峰肖平
Owner HENAN PULAIMU COATING TECH
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