CN110044948A - It is a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate - Google Patents

It is a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate Download PDF

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Publication number
CN110044948A
CN110044948A CN201910357103.6A CN201910357103A CN110044948A CN 110044948 A CN110044948 A CN 110044948A CN 201910357103 A CN201910357103 A CN 201910357103A CN 110044948 A CN110044948 A CN 110044948A
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CN
China
Prior art keywords
ceramic layer
barrier coating
thermal barrier
growth rate
crack growth
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910357103.6A
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Chinese (zh)
Inventor
雷钧
刘世庚
徐艳洁
刘慧�
付豪
陈玉玲
王秦
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Beijing University of Technology
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Beijing University of Technology
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Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN201910357103.6A priority Critical patent/CN110044948A/en
Publication of CN110044948A publication Critical patent/CN110044948A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic means
    • G01B7/16Measuring arrangements characterised by the use of electric or magnetic means for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18Measuring arrangements characterised by the use of electric or magnetic means for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means

Abstract

The invention discloses a kind of for measuring the device in situ of thermal barrier coating system ceramic layer on surface crack growth rate, which includes computer (101), matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106), fixed plate (107), resistance strain gage (108) and capture card (109);Guarantee to can change thermal barrier coating system temperature during the measurement experiment of thermal barrier coating system ceramic layer on surface crack growth rate by the device, the spreading rate in real-time monitoring crack propagation process, the apparatus structure is simple, easy to operate.

Description

It is a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate
Technical field
The present invention relates to a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate, passes through the dress It sets and guarantees to can change thermal barrier coating system heating temperature during crack growth rate measurement experiment, detection style heating- The crack growth rate of surface ceramii layer in heat preservation-temperature-fall period belongs to sample mechanical property tests technical field.
Background technique
For thermal barrier coating system since its good thermal protection effect is introduced in engineer application, main principle is most The low pyroconductivity of the ceramic material of outer layer protects blade to avoid directly contacting with hot environment the inhibition of heat.So And the crack propagation of surface ceramii layer and connection are easy to cause ceramic layer to get off to lose thermal protection effect from leaf abscission, make blade In high temperature, hyperoxia environment in, shorten the service life of blade.There are many factor for causing surface ceramii layer crackle to occur, It specifically includes that first, when the ceramic particle of thawing is sprayed on blade by atmospheric plasma spraying technology, by the mobile speed of spray gun The influence of the spraying parameters such as degree, the thawing degree of particle, the angle of injection causes surface to generate microfissure.Second, Under thermal cycle effect, quickly heating and cooling are easy to produce the direction drawing force in vertical crack face, and crackle is caused vertically to extend. Third, thermal barrier coating system is the complicated structural system of multiple material, the thermal physical property parameter between material mainly includes thermal expansion The differences such as coefficient, elasticity modulus, therefore the deformation between each layer is different during heating and cooling, can generate between layers Stretching or compression, accelerate or slow down the extension of crackle.The generation and expansion of crackle accelerates ceramic layer and takes off from blade The speed fallen, and the spreading rate of crackle is influenced by temperature, therefore the survey of the crack growth rate for surface ceramii layer It is difficult to realize to measure routine test device, so design is a set of to be directed to the dress that can control temperature real-time measurement sample mechanical property It sets extremely urgent.
Summary of the invention
In order to improve the above problem, the purpose of the present invention is to provide one kind for measuring thermal barrier coating system surface ceramic The device of layer crack growth rate guarantees that can change thermal boundary during crack growth rate measurement experiment applies by the device Crack extending length signal is converted to meter by the conversion of analog signal by layer system temperature, real-time measurement crack extending length The manageable voltage signal of calculation machine, to obtain fatigue crack growth rate curve figure.
To achieve the above object, The technical solution adopted by the invention is as follows:
It is a kind of for measuring the device in situ of thermal barrier coating system surface ceramii layer crack growth rate, device guarantee is split Thermal barrier coating system temperature, lossless decomposition style heating-heat preservation-cooling can be changed during the measurement experiment of line spreading rate Crack growth rate in the process;The device includes computer (101), matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106), fixed plate (107), resistance strain gage (108) and capture card (109);
Matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106) are from inside to outside It is arranged on fixed plate (107);
The computer (101) is individually present the left side of matrix (102);The outer wall of described matrix (102) spray to be formed it is viscous It ties layer (103);Adhesive layer (103) surface sputters to form aluminum oxide film (104);Aluminum oxide film (104) surface Spraying forms ceramic layer (105);The heating plate (106) is fixed on ceramic layer (105) surface by tension spring;Described matrix (102) inner wall and fixed plate (107) cylinder are interference fitted;The resistance strain gage (108) is pasted onto ceramic layer by adhesive glue (105) surface, two resistance strain gages (resistance is respectively R1, R4) are symmetrical;The capture card (109) is independently of computer (101) between fixed plate (107).
During the experiment, first by matrix (102), adhesive layer (103), aluminum oxide film (104) and ceramic layer (105) Composite structure is mounted in fixed plate (107), and two resistance strain gages (108) are symmetrically then attached to surface ceramii layer, will be electric Wheatstone bridge is collectively formed by two compensation resistance (R2, R4) in connecting line and capture card (109) in resistance foil gauge (108), Heating plate (106) is fixed on ceramic layer (105) surface by tension spring, assigned temperature, thermal barrier coating system is arranged in heating plate (106) System is heated to deform there are thermal stress, and surface ceramii layer crackle extends under thermal force, and crack propagation causes to strain The variation of sheet resistance realizes that strain signal is converted into resistance signal, and resistance signal is converted into voltage signal by Wheatstone bridge,
Crack growth rate is obtained after handling voltage signal by computer (101) at this time.
Compared with prior art, the invention has the following beneficial effects:
A kind of device in situ measuring thermal barrier coating system ceramic surface crack growth rate of the present invention, Ke Yigai Heating barrier coating system temperature, causes crackle to be extended, and realizes strain signal, resistance signal, voltage signal, crack propagation speed The conversion of rate curve.The real-time monitoring for realizing crack propagation under Thermal Load, works different to research heating-heat preservation-cooling etc. Crack growth rate has high practical value under condition.
Detailed description of the invention
Fig. 1 is a kind of Structure explosion diagram in situ for measuring thermal barrier coating system surface crack growth rate of the present invention.
Fig. 2 is a kind of structural side view in situ for measuring thermal barrier coating system surface crack growth rate of the present invention.
In figure: 101- computer, 102- matrix, 103- adhesive layer, 104- aluminum oxide film, 105- ceramic layer, 106- add Hot plate, 107- fixed plate, 108- resistance strain gage, 109- capture card.
Fig. 3 is the Wheatstone bridge figure built in capture card (109).
Fig. 4 is the flow chart that analog signal converts in the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is that the structure in situ for heating the measurement of thermal barrier coating system ceramic layer on surface crack growth rate of the invention is quick-fried Fried figure.
Fig. 2 is the structure side view in situ for heating thermal barrier coating system surface ceramii layer crack growth rate of the invention Figure.
Fig. 3 is of the invention to heat adopting for thermal barrier coating system surface ceramii layer crack growth rate analog signal conversion Wheatstone bridge figure built in truck (109).
Fig. 4 is that the analog signal in thermal barrier coating system surface ceramii layer crack growth rate that heats of the invention converts Flow chart.
Embodiment
It is a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate, which guarantees crack propagation It can change thermal barrier coating system temperature in speed measurement experimentation, in real-time monitoring surface ceramii layer crack propagation process The signal for characterizing crackle is converted to the manageable voltage signal of computer by the conversion of analog signal by length.The device Including computer (101), matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106), fixed plate (107), resistance strain gage (108) and capture card (109).
Matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106) are from inside to outside It is arranged on fixed plate (107);
The computer (101) and capture card (109) are individually present on the left of matrix (102);The outer wall of described matrix (102) Spraying forms adhesive layer (103);Adhesive layer (103) surface sputters to form aluminum oxide film (104);The aluminum oxide film (104) surface sprays to form ceramic layer (105);The heating plate (106) is fixed on ceramic layer (105) surface by tension spring;Institute It states matrix (102) inner wall and fixed plate (107) cylinder is interference fitted;The resistance strain gage (108) is attached to ceramic layer (105) Surface;The capture card is connected between computer (101) and resistance strain gage (108) by connecting line.
The present apparatus was being tested mainly in the experiment in situ that can heat thermal barrier coating system surface crack growth rate Matrix (102), adhesive layer (103), aluminum oxide film (104) and ceramic layer (105) composite structure are mounted on solid by Cheng Zhong first In fixed board (107), heating plate (106) is then fixed on ceramic layer (105) surface by tension spring, heating plate (106) setting refers to Determine temperature, thermal barrier coating system is heated to lead to crack propagation, and resistance strain gage (108) is attached to ceramic layer (105) surface, resistance The strain signal of acquisition is converted resistance signal by foil gauge, to change the resistance value in Wheatstone bridge, in crack propagation Caused resistance variations signal is stored in capture card (109), and voltage signal is passed to computer (101), computer by capture card It carries out relevant treatment and obtains the curve graph of crack growth rate.
Although the embodiment of the present invention discloses as above, present invention is not limited to this.Anyone skilled in the art, not It is detached from the spirit and scope of the present invention, can make various changes or modifications, therefore protection scope of the present invention should be with right It is required that subject to limited range.

Claims (2)

1. a kind of for measuring the device in situ of thermal barrier coating system ceramic layer on surface crack growth rate, it is characterised in that: should Device guarantees that thermal barrier coating system temperature and real-time monitoring crack propagation can be changed during crack growth rate measurement experiment Spreading rate;The device includes computer (101), matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106), fixed plate (107), resistance strain gage (108) and capture card (109);
Matrix (102), adhesive layer (103), aluminum oxide film (104), ceramic layer (105), heating plate (106) are arranged from inside to outside On fixed plate (107);
The computer (101) is individually present on the left of fixed plate (107);The outer wall of described matrix (102) sprays to form adhesive layer (103);Adhesive layer (103) surface sputters to form aluminum oxide film (104);Aluminum oxide film (104) the surface spraying It is formed ceramic layer (105);The heating plate (106) is fixed on ceramic layer (105) surface by tension spring;In described matrix (102) Wall and fixed plate (107) cylinder are interference fitted;The resistance strain gage (108) is attached to ceramic layer (105) surface;The capture card (109) it is linked together by connecting line with computer (101) and resistance strain gage (108).
2. according to claim 1 a kind of for measuring the original position of thermal barrier coating system ceramic layer on surface crack growth rate Device, it is characterised in that: during the experiment, first by matrix (102), adhesive layer (103), aluminum oxide film (104) and pottery Enamel coating (105) composite structure is mounted in fixed plate (107), and heating plate (106) is then fixed on ceramic layer by tension spring (105) assigned temperature is arranged in surface, heating plate (106), and surface ceramii layer microfissure expands when thermal barrier coating system is heated Exhibition causes to strain, and the resistance strain gage (108) for being attached to ceramic layer (105) surface collects strain signal and causes resistance-strain Piece resistance value changes, and resistance signal is converted to voltage signal and is input in computer by the Wheatstone bridge built in capture card, Computer handles voltage signal to obtain the curve graph of crack growth rate, passes through present apparatus real-time monitoring ceramic layer at this time (105) spreading rate of face crack.
CN201910357103.6A 2019-04-29 2019-04-29 It is a kind of for measuring the device in situ of thermal barrier coating system surface crack growth rate Pending CN110044948A (en)

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CN102608163A (en) * 2011-01-10 2012-07-25 通用电气公司 Methods, systems and apparatus for detecting material defects in combustors of combustion turbine engines
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