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Multilayer thermal barrier coating and phosphorescence-based surface layer and bottom layer temperature measurement method

A technology of thermal barrier coating and phosphorescence, applied in the direction of coating, fluorescence/phosphorescence, superimposed layer plating, etc., can solve the problems of inability to judge the thermal insulation effect of thermal barrier coatings, damage, and large errors in temperature measurement results, etc. Achieve the effect of convenient temperature measurement method and improve measurement efficiency

Active Publication Date: 2020-07-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multilayer thermal barrier coating and its phosphorescence-based surface layer and bottom layer temperature measurement method to solve the problems caused by gas absorption interference and contact measurement damage to the structure in the traditional thermal barrier coating temperature test. The error of the final temperature measurement result is large and it is impossible to judge the heat insulation effect of the thermal barrier coating

Method used

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  • Multilayer thermal barrier coating and phosphorescence-based surface layer and bottom layer temperature measurement method
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  • Multilayer thermal barrier coating and phosphorescence-based surface layer and bottom layer temperature measurement method

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Embodiment 1

[0033] figure 1 Structural diagram of multilayer thermal barrier coating provided by the present invention, such as figure 1 As shown, a multi-layer thermal barrier coating includes: a surface temperature-sensitive layer 1, a common heat-insulating layer 2 and a bottom temperature-sensitive layer 3; the common heat-insulating layer 2 is arranged on the surface temperature-sensitive layer 1 and the between the bottom temperature-sensitive layers 3; the surface temperature-sensitive layer 1 is formed by blending a ceramic substrate and a first phosphorescent substance; the bottom temperature-sensitive layer 3 is formed by blending a ceramic substrate and a second phosphorescent substance; The bottom of the bottom temperature-sensitive layer 3 is provided with a metal bonding layer; the two light intensity peaks of the first phosphorescent substance and the second phosphorescent substance do not overlap each other; two different excitation lights are used to respectively excite t...

Embodiment 2

[0045] figure 2 The flow chart of the temperature measurement method for the surface layer and the bottom layer of the phosphorescence-based multilayer thermal barrier coating provided by the present invention, such as figure 2 As shown, a method for measuring the temperature of the surface and bottom layers of a phosphorescence-based thermal barrier coating includes:

[0046] Step 201: Emit the first excitation light and the second excitation light from the air to the surface temperature-sensitive layer and the bottom temperature-sensitive layer; the first excitation light excites the first phosphorescent substance; the second excitation light excites the second phosphorescent substance; When the two different excitation lights are selected, when the first excitation light is used to excite the first phosphorescent substance, the first excitation light does not excite the second phosphorescent substance or the excitation is lower than the excitation threshold; when the firs...

Embodiment 3

[0055] Applying the method of measuring the temperature of the surface layer and the bottom layer in the second embodiment to practice, the technical solution will be clearly and completely described step by step below.

[0056] Step 1: emit two kinds of excitation light that can excite the two phosphorescent substances from the position of air 4 to the coating respectively. For Dy and Sm in the example, the corresponding excitation light wavelengths are 355nm and 532nm respectively; and 532nm The laser of 355nm cannot excite Dy, but the excitation of Sm by the 355nm laser is very weak and can be ignored, and the laser is used as the light source.

[0057] Step 2: Two kinds of excitation light enter the coating to respectively excite Dy in the surface temperature-sensitive layer and Sm in the bottom temperature-sensitive layer. Phosphorescence is emitted in the two thermosensitive layers respectively.

[0058] Step 3: Two kinds of phosphorescence pass through the ceramic coat...

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Abstract

The invention provides a multilayer thermal barrier coating and a phosphorescence-based surface layer and bottom layer temperature measurement method. According to the method, based on the principle that the luminescence decay time of a ceramic-based phosphorescent substance is sensitive to temperature and the phosphorescence permeability of the coating, different phosphorescent substances are doped into the surface layer and the bottom layer of the coating, the two phosphorescent substances are excited at the same time, and phosphorescence emitted by the two phosphorescent substances is collected and analyzed, so that simultaneous temperature measurement of the surface layer and the bottom layer of the coating is realized. The damage to the structure and result errors caused by absorptioninterference of environmental gas and contact measurement in the traditional thermal barrier coating temperature test are avoided; and the method only pays attention to the relative change of the light intensity along with the time, and has no accurate requirement on the absolute light intensity, so that the influence of the coating on light absorption and scattering does not need to be accurately calculated and evaluated, and the method is more convenient. According to the method, the thermal barrier coating material is directly and partially doped, and the thickness and the thermal insulation effect of the thermal barrier coating are not influenced.

Description

technical field [0001] The invention relates to the field of non-contact solid temperature measurement, in particular to a multilayer thermal barrier coating and a method for measuring the temperature of the surface layer and the bottom layer based on phosphorescence. Background technique [0002] With the continuous development of aerospace technology, the temperature before the turbine of an aero-engine has far exceeded the temperature resistance limit of metal materials. In this case, the aero-engine thermal barrier coating has become a solution. The heat insulation effect is achieved by coating high thermal resistance materials on the surface of high-temperature components. The main material of the thermal barrier coating is high-temperature resistant ceramics. Through a layer of The alumina-based bonding layer is bonded to the metal substrate. [0003] However, the thermal barrier coatings of existing aero-engines mainly have the following two problems: the heat insula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/00G01N21/64C23C28/00
CPCC23C28/30G01K11/00G01N21/64
Inventor 全永凯徐国强刘臻丽殷秋洋闻洁董苯思
Owner BEIHANG UNIV