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A kind of multi-layer thermal barrier coating and its surface layer and bottom layer temperature measurement method based on phosphorescence

A technology of thermal barrier coating and phosphorescence, which is applied in the direction of coating, fluorescence/phosphorescence, superimposed layer plating, etc., can solve the problems of gas gas absorption interference, damage, and the inability to judge the thermal insulation effect of thermal barrier coatings, etc.

Active Publication Date: 2021-04-30
BEIHANG UNIV
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  • Summary
  • 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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  • A kind of multi-layer thermal barrier coating and its surface layer and bottom layer temperature measurement method based on phosphorescence
  • A kind of multi-layer thermal barrier coating and its surface layer and bottom layer temperature measurement method based on phosphorescence
  • A kind of multi-layer thermal barrier coating and its surface layer and bottom layer temperature measurement method based on phosphorescence

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Embodiment 1

[0033] figure 1 Structural diagram of the 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 thermal insulation layer 2, and a bottom thermal-sensitive layer 3; the common thermal insulation layer 2 is provided on the surface thermal-sensitive layer 1 and all between the bottom temperature-sensitive layers 3; the surface temperature-sensitive layer 1 is formed by mixing a ceramic substrate and a first phosphorescent substance; the bottom temperature-sensitive layer 3 is formed by mixing 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 excite the a first ph...

Embodiment 2

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

[0046] Step 201 : emit a first excitation light and a second excitation light to the surface temperature sensitive layer and the bottom temperature sensitive layer from the air; the first excitation light excites a first phosphorescent substance; the second excitation light excites a 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 first excitation light is us...

Embodiment 3

[0055] The method for measuring the temperature of the surface layer and the bottom layer in the second embodiment is applied in practice, and the present technical solution will be clearly and completely described below according to the steps.

[0056] Step 1: Two kinds of excitation light that can excite these two phosphorescent substances are emitted 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 can not excite Dy, and the excitation of Sm by the 355nm laser is very weak, which can be ignored, and the laser is used as the light source.

[0057] Step 2: Two excitation lights enter the coating to excite Dy in the surface thermosensitive layer and Sm in the bottom thermosensitive layer respectively. The two temperature sensitive layers emit phosphorescence respectively.

[0058] Step 3: The two phosphors pass through the ceramic ...

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Abstract

The present invention provides a multilayer thermal barrier coating and its phosphorescence-based surface and underlayer temperature measurement methods. This method is based on the sensitivity of the luminescence decay time of the ceramic-based phosphorescent substance to temperature, and based on the permeability of the coating to phosphorescence, by doping different phosphorescent substances on the surface and bottom of the coating, the two phosphorescent substances are simultaneously excited. And the phosphorescence emitted by them is collected and analyzed to realize simultaneous temperature measurement of the surface layer and the bottom layer of the coating. It avoids the absorption interference of ambient gas in the traditional thermal barrier coating temperature test and the damage to the structure and the error caused by the contact measurement; and because this method only pays attention to the relative change of light intensity with time, but not to the absolute light intensity There is no precise requirement, and there is no need for precise calculation to evaluate the influence of coating on light absorption and scattering, which makes this method more convenient. The method directly partially dopes the material of the thermal barrier coating without affecting the thickness of the thermal barrier coating itself and its heat insulation effect.

Description

technical field [0001] The invention relates to the field of non-contact solid temperature measurement, in particular to a multi-layer 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 aero-engine has far exceeded the temperature limit of metal materials. In this case, aero-engine thermal barrier coating has become a solution. The thermal insulation effect is achieved by coating the surface of high temperature components with high thermal resistance materials. The main material of thermal barrier coating is high temperature resistant ceramics. The bonding layer with alumina as the main component is bonded to the metal substrate. [0003] The existing thermal barrier coatings for aero-engines mainly have the following two problems: the thermal insulation effect is not ...

Claims

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Application Information

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Patent Type & Authority Patents(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