Preparation method of wearable seal coating with titanium fire preventing function

A sealing coating and wear-resistant technology, applied in coating, metal material coating technology, sustainable transportation, etc., can solve problems such as the reduction of compressor efficiency

Inactive Publication Date: 2012-07-11
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the working principle of the engine, the coating on the inner wall of the compressor casing should firstly play the role of abradable seal to ensure the radial clearance between the rotor blade tip and the inner ring of the casing, and reduce the efficiency of the compressor.

Method used

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  • Preparation method of wearable seal coating with titanium fire preventing function
  • Preparation method of wearable seal coating with titanium fire preventing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ni 3 The particle size of Al powder is -100 mesh to +325 mesh, and the powder is spherical; the particle size of CuAl / BN powder is -80 mesh to +325 mesh, and the powder is spherical; the thickness of the three-layer coating system is Ni 3 Al bottom layer 0.07mm, middle insulation layer Zr0 2 ·Y 2 0 3 Coating 0.15mm, CuAl / BN surface layer 1.0mm.

[0022] Plasma spraying process parameters:

[0023] Ni 3 Al bottom layer process is: current 500A, spraying distance 120mm, spraying power 32kW; Zr0 2 ·Y 2 0 3 Coating process: current 600A, spraying distance 100mm, spraying power 45kW; CuAI / BN coating process: current 400A, spraying distance 110mm, spraying power 20kW.

[0024] The obtained coating has a tensile bonding strength of 6.5 MPa and a surface Rockwell hardness of 45HR15Y.

[0025]

Embodiment 2

[0027] Ni 3 The particle size of Al powder is -100 mesh to +325 mesh, and the powder is spherical; the particle size of CuAl / BN powder is -80 mesh to +325 mesh, and the powder is spherical; the thickness of the three-layer coating system is Ni 3 Al bottom layer 0.10mm, middle insulation layer Zr0 2 ·Y 2 0 3 Coating 0.12mm, CuAl / BN surface layer 1.0mm.

[0028] Plasma spraying process parameters:

[0029] Ni 3 Al bottom layer process is: current 500A, spraying distance 140mm, spraying power 34kW; Zr0 2 ·Y 2 0 3 Coating process: current 600A, spraying distance 100mm, spraying power 45kW; CuAI / BN coating process: current 360A, spraying distance 120mm, spraying power 22kW.

[0030] The obtained coating has a tensile bonding strength of 7 MPa and a surface Rockwell hardness of 50HR15Y.

[0031]

Embodiment 3

[0033] Ni 3 The particle size of Al powder is -100 mesh to +325 mesh, and the powder is spherical; the particle size of CuAl / BN powder is -80 mesh to +325 mesh, and the powder is spherical; the thickness of the three-layer coating system is Ni 3 Al bottom layer 0.10mm, middle insulation layer Zr0 2 ·Y 2 0 3 Coating 0.12mm, CuAl / BN surface layer 1.2mm.

[0034] Plasma spraying process parameters:

[0035] Ni 3 Al bottom layer process is: current 500A, spraying distance 140mm, spraying power 34kW; Zr0 2 ·Y 2 0 3 Coating process: current 600A, spraying distance 100mm, spraying power 45kW; CuAI / BN coating process: current 410A, spraying distance 130mm, spraying power 25kW.

[0036] The obtained coating has a tensile bonding strength of 7.8MPa and a surface Rockwell hardness of 55HR15Y.

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Abstract

The invention aims at providing a preparation method of a wearable seal coating with a titanium fire preventing function. The preparation method is characterized in that the wearable seal coating is a three-layer coating system, wherein a bottom layer is an Ni3Al coating, a middle layer is a ZrO2.Y2O3 heat insulation coating, and a surface layer is a CuAl / BN wearable seal coating. The wearable seal coating is prepared by adopting a plasma spraying method, process parameters are as follows: the bottom layer has a process current of 500-520A and a spraying distance of 120-140mm as well as a spraying power of 30-36kW, the middle layer has a process current of 600-620A and a spraying distance of 80-110mm as well as a spraying power of 42-46kW, and the surface layer has a process current of 360-420A and a spraying distance of 110-130mm as well as a spraying power of 20-25kW. The three-layer coating system has better heat insulation performance, a certain scouring resistance, better wearability and low friction coefficient, and can be used as a titanium fire preventing coating of a titanium alloy casing.

Description

technical field [0001] The invention belongs to the application of thermal spraying technology in the field of abradable sealing coating. Background technique [0002] The high-pressure compressor case of high-thrust ratio aero-engine is made of titanium alloy. During the operation of the engine, the titanium alloy compressor case will collide or catch fire due to friction, which is the so-called "titanium fire". In order to ensure the safety and reliability during use, it is necessary to deposit an anti-titanium fire coating on the surface of titanium alloy parts. [0003] According to the working principle of the engine, the coating on the inner wall of the compressor casing should firstly play the role of abradable seal to ensure the radial clearance between the rotor blade tip and the inner ring of the casing, and reduce the efficiency of the compressor. Therefore, the anti-titanium fire coating of this project should be a coating with two functions of abradable sealing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/08C23C4/10C23C4/06C23C4/11C23C4/134
CPCY02T50/60
Inventor 王璐张佳平郑渠英刘艳袁福河
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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