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Method for detecting residual stress of multi-ceramic thermal barrier coating

A technology of thermal barrier coating and residual stress, which is applied in the direction of coating, testing material strength by applying a stable bending force, metal material coating process, etc., and can solve problems such as limited application and shallow detection depth

Pending Publication Date: 2022-01-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of X-ray and Raman is that their detection depth is relatively shallow, usually tens of microns, which can only reflect the stress state of the coating surface, and although neutron diffraction can detect the residual stress in the deep part of the coating, it can achieve a higher resolution. There are only a handful of high-efficiency neutron sources in the world, which greatly limits its application in TBC

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  • Method for detecting residual stress of multi-ceramic thermal barrier coating
  • Method for detecting residual stress of multi-ceramic thermal barrier coating
  • Method for detecting residual stress of multi-ceramic thermal barrier coating

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Embodiment 1

[0032] A method for detecting residual stress of a multi-ceramic thermal barrier coating, the steps are as follows:

[0033] (1) Mixing: the ceramic layer material La 2 Zr 2 o 7 Fluorescent material Y with luminescent properties 2 o 3 : Eu 3+ The fluorescent powder is mixed according to the mass ratio of 6%, and the composite powder is mixed evenly by a planetary mixer to obtain a mixed ceramic powder;

[0034] The rotating speed of described mixer is 500r / min; There are zirconia mixing balls in described mixer, and the ratio of ball to material is 10:1;

[0035] (2) Spraying: sandblasting the elongated metal substrate (15cm in length, 3mm in thickness, and 5mm in width), and then using a plasma spraying system to spray the mixed ceramic powder obtained in step (1) on the metal substrate to obtain Composite coating (LZO / Y) with a thickness of 300 μm 2 o 3 : Eu 3+ );

[0036] The sandblasting used corundum sand with a particle size of 300 mesh and a blasting pressure ...

Embodiment 2

[0044] A method for detecting residual stress of a multi-ceramic thermal barrier coating, the steps are as follows:

[0045] (1) Mixing: the ceramic layer material Gd 2 Zr 2 o 7 (GZO) and Luminescent Properties Fluorescent Material Y 2 o 3 : Eu 3+ The fluorescent powder is mixed according to the mass ratio of 6%, and the composite powder is mixed evenly by a planetary mixer to obtain a mixed ceramic powder;

[0046] The rotating speed of described mixer is 500r / min; There are zirconia mixing balls in described mixer, and the ratio of ball to material is 10:1;

[0047] (2) Spraying: sandblasting the elongated metal substrate (15cm in length, 3mm in thickness, and 5mm in width), and then using a plasma spraying system to spray the mixed ceramic powder obtained in step (1) on the metal substrate to obtain Composite coating (GZO / Y) with a thickness of 300 μm 2 o 3 : Eu 3+ );

[0048] The sandblasting used corundum sand with a particle size of 300 mesh and a blasting pres...

Embodiment 3

[0054] According to the method of Steps (1) to (3) of Example 1, ceramic thermal barrier coating materials of different doping systems are sequentially deposited on the metal substrate, first depositing LZO and luminescent fluorescent material Y 2 o 3 : Eu 3+ The thermal barrier coating ceramic layer mixed with fluorescent powder according to the mass ratio of 6%, followed by depositing GZO and luminescent characteristic fluorescent material Y on the composite coating according to the method of embodiment 2 steps (1)-(3) 2 o 3 : Eu 3+ Thermal barrier coating ceramic layer mixed with fluorescent powder at a mass ratio of 6%, to achieve a surface layer of GZO / Y 2 o 3 : Eu 3+ , the lower layer is LZO / Y 2 o 3 : Eu 3+ The multi-ceramic layer composite structure, each with a thickness of 150 μm. Lower LZO / Y 2 o 3 : Eu 3+ The fluorescence luminescence peak and the stress state equation are as embodiment 1, the lower layer GZO / Y 2 o 3 : Eu 3+ The fluorescence luminescen...

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Abstract

The invention provides a method for detecting residual stress of a multi-ceramic thermal barrier coating, which comprises the following steps of: constructing a TBCs stress test basis by determining the quantitative corresponding relation between stress and fluorescence emission spectrum characteristic peak displacement by utilizing the quantitative deviation of the emission spectrum characteristic peak of fluorescence particles caused by the matrix lattice distortion of the fluorescence particles after the emission spectrum characteristic peak is stressed; selecting fluorescent powder with light-emitting characteristics as a stress response unit; and collecting fluorescence emission spectrum peak information of a thermal barrier coating after service, and testing the internal residual stress of the ceramic layer of the multi-ceramic thermal barrier coating.

Description

technical field [0001] The invention relates to the technical field of stress detection of ceramic thermal barrier coatings, in particular to a method for detecting residual stress of multiple ceramic thermal barrier coatings. Background technique [0002] With the continuous increase of engine thrust-to-weight ratio and air inlet temperature, traditional 8YSZ materials will undergo obvious sintering and phase structure transformation when used above 1200 °C. In order to prolong the service life of TBCs and adapt to higher temperature requirements, the double ceramic TBCs structure is used. pregnancy. Even if the new material is prepared on top of the 8YSZ material to protect the underlying 8YSZ material and the underlying superalloy, the 8YSZ material can alleviate the thermal expansion mismatch between the upper ceramic layer and the substrate, thus making it suitable for higher temperature operating conditions. However, the service environment of double ceramic TBCs is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00G01L1/24G01N3/20G01N1/28G01N1/38C23C4/10C23C4/134
CPCG01L5/0047G01L1/24G01N3/20G01N1/28G01N1/38C23C4/134C23C4/10Y02P10/20
Inventor 成波张馨楚倩倩王玉安国升何东青翟海民张辛健何玲李文生
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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