CN103063563B - Testing device for simulation and real-time detection of high-temperature deposition corrosion of thermal barrier coatings - Google Patents
Testing device for simulation and real-time detection of high-temperature deposition corrosion of thermal barrier coatings Download PDFInfo
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- CN103063563B CN103063563B CN201310009223.XA CN201310009223A CN103063563B CN 103063563 B CN103063563 B CN 103063563B CN 201310009223 A CN201310009223 A CN 201310009223A CN 103063563 B CN103063563 B CN 103063563B
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Abstract
The invention discloses a testing device for simulation and real-time detection of high-temperature deposition corrosion of thermal barrier coatings, belonging to the field of simulation devices in a special service environment. The testing device comprises a test board which is equipped with a sample fixture and a fixture fixing device, a cooling system, a high-temperature corrosion service environment simulation module, an exhaust system, a complex impedance spectroscopy measuring system, an acoustic emission testing system and a test control and display platform, wherein the complex impedance spectroscopy measuring system and the acoustic emission testing system are integrated together. The device can be used for adjusting the parameters such as variety, concentration, corrosive temperature of corrosive medium. The change of coating impedance and damaged acoustic emission signals when a sample is corroded can be periodically detected by the complex impedance spectroscopy measuring system and the acoustic emission testing system, the high-temperature corrosion of various impurity particles, such as Ca, Mg, Al, Si and Na of thermal barrier coatings of aero-engine turbine blades in actual service temperature environment is actually simulated; in addition, the corrosion failure process is periodically detected; and an important test platform is provided for correctly understanding the high-temperature corrosion mechanism of thermal barrier coatings and optimizing the material design thereof.
Description
Technical field
The present invention relates to the test unit of a kind of simulation and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, particularly relate to a kind of simulation aeromotor internal solid particles fuse and deposit to thermal barrier coating surface, and then the process of corrosion thermal barrier coating, and realize the test unit of multiple corrosion parameter real-time testing, belong to special military service environment simulator field.
Background technology
Thermal barrier coating (thermal barrier coatings, be called for short TBCs) be one of current domestic and international state-of-the-art high-temperature protection coating, because " thermal boundary " of its ceramic coat low thermal conductivity acts on, thus when making high-temperature alloy turbine blade bear identical temperature, fuel gas temperature 200-300 DEG C can be improved, and then improve the thermal efficiency of turbine engine, and extend the serviceable life of turbo blade.Advance in the works, all one of TBCs technology gordian technique being classified as High Performance Aeroengine in the aeromotor of the U.S., Europe and China.And think, adopt TBCs technology to be increase substantially the most practicable method of aeromotor working temperature at present.Through the high speed development of over half a century, people successfully have developed 7-8 (wt.) %Y
2o
3stable ZrO
2the TBCs design of material scheme of ceramic layer (7YSZ), MCrAlY intermediate layer, nickel base superalloy substrate, develop air plasma spraying, physical vapour deposition (PVD) two kinds of typical preparation technologies, and by its successful Application in the turbo blade and firing chamber of aeromotor.But there is huge physics, heat, mechanical property difference between each layer due to composition TBCs system, add extremely complicated geometric configuration, micromechanism and Service Environment, make TBCs ftracture, peel off and lose efficacy in unforeseen situation.Therefore, the failure mechanism of research TBCs under actual Service Environment is the important reference instructing its safety applications, optimize its design.
Aircraft is under arms in process, the impurity such as Na, S, V in Aviation Fuel and atmospheric environment at high temperature can generate with oxygen generation chemical reaction the surface that salt or oxide cover ceramic layer, even to penetrate in ceramic layer in Micro-v oid or crackle, change the phase structure of ceramic layer, reduce the strain tolerance limit of ceramic layer, thus cause coming off of ceramic layer, form thermal barrier coating corrosion failure.In addition, when thermal barrier coating surface temperature is higher than 1200 DEG C, floating with CaO-MgO-Al in air
2o
3-SiO
2after the sand and dust that (being called for short CMAS) is principal ingredient or volcanic debris are inhaled into engine, can melt and be deposited on thermal barrier coating surface, and internally permeating along defects such as the pore in coating, crackles.Deposit and the CMAS the permeated ZrO that yttria can not only be made partially stabilized
2occur by the transformation of stable Tetragonal (t ') to monoclinic phase (m), this phase transformation can produce the volumetric expansion that reach 4% in ceramic layer, makes coating that cracking or spalling failure occur; And the CMAS of melting cool down after compare ZrO
2ceramic layer has lower fracture toughness and heat-resistant knocking stability, and under the effect of the external applied load such as high temperature, high centrifugal force, the inefficacy of coating is easier occurs at CMAS lodgment, thus accelerates the inefficacy of coating.Therefore, research TBCs these high temperature deposition things corrosion under destructive characteristics and key influence factor, be the key of correct understanding TBCs failure mechanism.And feature and the key influence factor of TBCs corrosion will be found out, the analogue means of development simulation TBCs high temperature deposition thing corrosion is inevitable requirement.
At present, the development both at home and abroad about TBCs high temperature deposition thing corrosion test analogue means is also fewer.Researchist when studying the corrosion of TBCs high temperature deposition thing, normally by corrosive medium brushing at surface ceramii layer, then in high temperature furnace, heating realizes the high temperature corrosion of TBCs, and is evaluated the corrosive nature of TBCs qualitatively by the mode of weighing.The people such as Li Zhiming disclose a kind of method of testing and device (patent application publication number: CN 10865814 A) of thermal barrier coating layer high-temperature resistance molten salt corrosion, adopt heating arrangement to make fused salt evaporate and corrode TBCs, take out samples weighing when arriving the etching time of setting and its corrosive nature is evaluated; The people such as Gong Shengkai disclose a kind of thermal barrier coating service environment simulator and simulated environment control method (patent publication No.: CN1699994), adopt bath heating Na
2sO
4, the salts substances such as NaCl obtains aggressive atmosphere, and makes the corrosion gas dividing potential drop in quartz ampoule remain on 0 ~ 0.01MPa by the adjustment of corrosive gas flow and pressure.In these methods, can only be simulated by the corrosion environment of mode to TBCs generating etchant gas on the one hand, the process of TBCs corrosion failure is not detected in real time or evaluated on the one hand.Therefore, development can simulate the test unit that thermal barrier coating high temperature deposition thing (as CMAS) corrodes, and to carry out detecting in real time to the process of thermal barrier coating corrosion failure be correct understanding thermal barrier coating failure mechanism, optimize the important channel of its design.
Summary of the invention
The object of this invention is to provide the test unit of a kind of simulation and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, the working environment of heat-chemical coupling in aeromotor can be simulated, and the temperature that can realize different geometries sample in complex corrosion environment, thermograde, interface oxide layer and thicken rule, the test of the situations such as corrosion cracking germinating and expansion, for the understanding thermal barrier coating high temperature corrosion mechanism that we are correct, optimize its design of material, important test platform is provided, and can be applicable to the test that in different field, high-temperature component material hot corrosion was lost efficacy.
The present invention adopts following technical proposal: described test unit structure comprises: experimental test platform, and the high temperature corrosion Service Environment analog module, cooling system, exhaust system, complex impedance spectra measuring system, acoustic emission detection system, temperature test acquisition system, controlling test and the display platform that are connected with this experimental test platform respectively.
The primary structure of test unit is: experimental test platform is installed the sample holding device be made up of sample clamp and fixture fixing device, specimen holder can rotate certain angle with installation shaft, and specimen holder is manufactured with difform sample connector, can test discoid, tabular, cylindric, actual turbo blade shape four kinds of difform samples; Sample holding device is positioned in the sample chamber that is made up of the quartz glass of corrosion-and high-temp-resistant, and sample chamber has hole, acoustic emission detection system detect with waveguide rod, complex impedance spectra measuring system with electrode with and temperature thermocouple passing hole be connected sample; On experimental test platform, the side of sample chamber is provided with and along the gun fixture of test board guide rail movement, gun fixture can arranges high-temperature fuel gas spray gun, and its nozzle can stretch in sample chamber; Above sample chamber, infrared thermometer is installed.The below of sample chamber is placed with complex impedance spectra measuring system, acoustic emission detection system, system for detecting temperature, in order to detect the etch state of thermal barrier coating sample, damage development and change of temperature field situation in real time, the below of sample chamber is also provided with controlling test and the display platform of control device work and display working.
Described high temperature corrosion Service Environment simulation system is made up of a special high-temperature fuel gas spray gun and input system thereof, and wherein the inside surface of corrosive particles storer, corrosive particles passage and high-temperature fuel gas spray gun all adopts resistant material to make.
Described high-temperature fuel gas spray gun take propane as fuel, and heating rate is fast, is 20-1700 DEG C to the heated perimeter of sample, different melting points (V
2o
5fusing point: 690 DEG C; CaO-MgO-Al
2o
3-SiO
2fusing point: 1240 DEG C) solid granulates all applicable, spray gun is fixing and can be moved on horizontal guide rail by Serve Motor Control by spray gun erecting device.
The input system of described high-temperature fuel gas spray gun comprises combustion gas input channel, oxygen input channel, corrosive particles input channel, combustion gas input channel is made up of fuel cartridge and corresponding flow valve, oxygen input channel is made up of oxygen tank and corresponding flow valve, corrosive particles input channel and corrosive particles storer, forcing pump, flow valve connects successively, particle in corrosive particles container pours in high-temperature fuel gas spray gun by forcing pump, the flow of particle is controlled by flow valve, after particle fully mixes with flame in the firing chamber of spray gun, driven by high-temperature high-speed airflow and deposit to specimen surface rapidly.
Described corrosive particles storer dividing plate is divided into four memory blocks, stores NaCl respectively, Na
2sO
4, V
2o
5with CMAS corrosive deposit, these four kinds of materials can combination in any, and realize the simulation of complex corrosion environment, grain flux is 0-250g/min.
Described cooling system has two kinds of types of cooling: one is the air cooling to sample, and the refrigerating gas in air compressor enters through the bottom inlet of cooling duct entrance by sample internal cooling channel, through sample internal channel, is exported discharge by the refrigerating gas at top; Two is the water-cooleds to gas spray gun, and in cooling water tank, current are circulated between spray gun and cooling water tank at two through cooling duct entrance by the control of flow valve.
Described exhaust system comprises and hangs on air-suction cover above sample chamber and purification plant; Air-suction cover is for collecting the waste gas in sample chamber, and purification plant absorbs corrosive particles and toxic gas for filtering, and waste gas reaches environmental protection standard after purification plant process, just can directly enter in air.
Described complex impedance spectra measuring system adopts the 1260+1296 type complex impedance spectra measuring system of Solartron company of Britain, the connecting line of instrument is connected with the test electrode be welded on sample, in real time or the Changing Pattern of periodic measurement thermal barrier coating impedance, thus analyze the differentiation situation of thermal barrier coating in high temperature deposition thing corrosion Service Environment electric property, micromechanism.The important technological parameters of complex impedance spectra measuring system is: range of current is 200nA ~ 2A; Current resolution is 1pA; Voltage range is ± 14.5V; Voltage resolution is 1 μ V; Frequency range is 10 μ ~ 1M Hz.
The sensitivity that described acoustic emission detection system adopts American Physical acoustics company to produce is 10
-8the PCI-2 acoustic emission detection system of cm magnitude, calibrate AE sensor is connected with waveguide rod, realizes the in situ detection of the germinating to thermal barrier coating internal fissure, expansion and location.The main technical parameter of acoustic emission detection system is: 18 built-in A/D converters and the suitableeer one of processor are used for short arc, the setting of low threshold value (17dB), maximum signal amplitudes 100dB, dynamic range >85dB, 4 high passes and 6 low passes; PCI-2 is equipped with acoustic emission data stream measuring device, acoustic emission waveform constantly can be turned to hard disk, speed can reach 10M/ second; PCI-2 plate is equipped with 2 optional parameter passages, this passage has the A/D converter of 16, and speed is 10000/second, parallel multiple FPGA processor and ASIC IC chip.
Described temperature test acquisition system comprises thermopair and infrared thermometer, temperature indicator.Thermopair is connected with the temperature indicator on controlling test platform, measures the temperature in sample internal channel and refrigerating gas exit, realizes the temperature test of specified location; Infrared thermometer is for measuring the temperature field of specimen surface.
Described controlling test and display platform are control and the display device of experimental test platform and detection system, for controlling the opening of all mechanical drive and each instrument, and simultaneous display experimental result, realize the co-operating of process of the test and test process.
Beneficial effect of the present invention is: test unit high-temperature fuel gas spray gun loading system of the present invention makes thermal source with propane flame, heat up and rate of temperature fall fast, adopt air compressor that the corrosive particles such as aluminium, sulphur, phosphorus are squeezed to pistol-port place fast by particle charging system, by high-temperature fuel gas heating, reaction, generate the high temperature deposition thing of melting, the heating from 20-1700 DEG C of scope can be realized, and corrosive particles kind, concentration, composition are adjustable, the Service Environment of thermal barrier coating turbo blade high temperature corrosion can be simulated.And test unit is integrated with the PCI-2 type acoustic emission detection system of American Physical acoustics company production, the 1260+1296 type complex impedance spectra measuring system that Solartron company of Britain produces, be used for respectively measuring the germinating of crackle and expansion, interface topography develop, micromechanism and chemical composition change.Test unit has 2 kinds of dissimilar cooling devices, and a kind of is cooling system to high-temperature clamp, and the mode passing to chilled water cools; Another kind cools the sample of band cooling duct, and the mode passing to cooling-air cools.High temperature corrosion experiment when thermal barrier coating has thermograde to exist can be realized, approach the Service Environment of thermal barrier coating reality further.Therefore, the present invention can simulate aero engine turbine blades thermal barrier coating high temperature corrosion Service Environment, and can detect in real time the process of thermal barrier coating corrosion failure, for correct understanding thermal barrier coating high temperature corrosion mechanism, optimize the test platform that its design of material provides important.
Accompanying drawing explanation
Fig. 1 is logical organization schematic diagram of the present invention;
Fig. 2 is experiment test device structural representation of the present invention;
Fig. 3 is sample and connection diagram of the present invention.
Number in the figure: 101-sample clamp; 102-fixture fixing device; 103-sample chamber; 104-sample; 105-high-temperature fuel gas spray gun; 106-gun fixture; 107-infrared thermometer; 108-corrosive particles storer; 109-corrosive particles pipeline; 110-fuel cartridge; 111-oxygen tank; 112-forcing pump; 113-flow valve; 114-thermopair; 115-temperature test acquisition system; 116-air compressor; 117-airmeter; 118-cooling duct; 119-air-suction cover; 120-purification plant; 121-complex impedance spectra test macro; 122-test electrode; 123-acoustic emission detection system; 124-waveguide rod; 125-controlling test and display platform.
Embodiment
The invention provides the test unit of a kind of simulation and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, illustrate that the present invention will be further described with embodiment below by accompanying drawing.
(1) this test unit is used to carry out NaCl, Na to cylindric thermal barrier coating
2sO
4or V
2o
5the step of single corrosive medium simulation test and real-time testing is:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs.
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By NaCl, Na
2sO
4or V
2o
5deng joining in the memory block of corrosive particles storer (108) respectively.
3rd step: start acoustic emission detection system (123), open testing software, set the experiment parameters such as threshold value; Start ac impedance spectral measurement system, open testing software, set the experiment parameter such as frequency range, voltage magnitude.
4th step: starting characteristics test device, open software is set, setting sample heating temperature be 900 DEG C, adjustments grain flux is 20mg/s, arrange sample load mode be each thermal cycle mode be heat time 10s, temperature retention time is 300s, cool time 200s.
5th step, opens air compressor (116), opens combustion gas input system, oxygen input system, spray gun firing system successively.After even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), particle is transported in the firing chamber of spray gun, and after fully mixing with flame, molten state erosion is ejected into specimen surface with flame.Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample.
6th step: when the circulating cooling stage observe sample (104) ftracture or occur disbonding time, stop test, record times of thermal cycle.
7th step: data processing: utilize Zview software, uses Equivalent Circuit Fitting experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Extract thermal barrier coating high temperature NaCl, Na
2sO
4or V
2o
5the frequecy characteristic of the acoustic signals launched when different crackle is formed during corrosion, judges the type of crackle, and carries out quantitative test.
(2) this test unit is used to carry out Na to cylindric thermal barrier coating
2sO
4and V
2o
5the step of both corrosion simulated tests of combination and real-time testing is:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs.
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By Na
2sO
4and V
2o
5join in subregion corresponding to corrosive particles storer (108); Set the data acquisition parameters of each instrument.
3rd step: start acoustic emission detection system (123), open testing software, set the experiment parameters such as threshold value; Start ac impedance spectral measurement system, open testing software, set the experiment parameter such as frequency range, voltage magnitude.
4th step: starting characteristics test device, opens and arranges software, and setting sample heating temperature is 900 DEG C, regulates Na
2sO
4with V
2o
5discharging mass ratio be 4:6, adjustment grain flux is 20mg/s, arrange sample load mode for each thermal cycle mode be heat time 10s, temperature retention time is 300s, cool time 200s.
5th step: open air compressor (116), open combustion gas input system, oxygen input system, spray gun firing system successively, after even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), automatically control Na
2sO
4with V
2o
5discharging mass ratio, particle is transported in the firing chamber of spray gun, and after fully mixing with flame, molten state erosion is ejected into specimen surface with flame.Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample.
6th step: when the circulating cooling stage observe sample (104) ftracture or occur disbonding time, stop test, record times of thermal cycle.
7th step: data processing: utilize Zview software, uses Equivalent Circuit Fitting experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Extract thermal barrier coating high temperature Na
2sO
4+ V
2o
5the frequecy characteristic of the acoustic signals launched when different crackle is formed during corrosion, judges the type of crackle, and carries out quantitative test.
(3) this test unit is used to the step that cylindric thermal barrier coating carries out the corrosion simulated test of CMAS and real-time testing to be:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs.
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By CaO, MgO, Al
2o
3and SiO
2pressed powder mixes by a certain percentage, joins the CMAS memory block of corrosive particles storer (108).
3rd step: start acoustic emission detection system (123), open testing software, set the experiment parameters such as threshold value; Start ac impedance spectral measurement system, open testing software, set the experiment parameter such as frequency range, voltage magnitude.
4th step: starting characteristics test device, opens and arranges software, and setting sample heating temperature is 1250 DEG C, and adjustment grain flux is 20mg/s, arranges sample load mode for keeping sample heating temperature to be 1250 DEG C of continuous heating 2h.
5th step: open air compressor (116), open combustion gas input system, oxygen input system, spray gun firing system successively, after even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), CMAS particle is transported in the firing chamber of spray gun, after fully mixing with flame, the CMAS erosion of molten state is ejected into specimen surface with flame.Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample.
6th step: arrive setting-up time or stop test when sample (104) ftractures or occur disbonding.
7th step: data processing: utilize Zview software, carries out matching with equivalent electrical circuit to experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Analyze the sound emission signal characteristic of thermal barrier coating high temperature CMAS corrosion, analyze the mechanism that thermal barrier coating CMAS destroys.
The present invention can simulate aero engine turbine blades thermal barrier coating high temperature corrosion Service Environment, can real simulation thermal barrier coating turbo blade under actual service temperature environment various impurity particle (as Ca, Mg, Al, Si, Na, V, S etc.) high temperature corrosion, and the kind of corrosive medium can be regulated, the parameter such as concentration and corrosion temperature, and can by the damage development situation of complex impedance spectra measuring system and acoustic emission detection system periodic detection sample corrosion failure, for correct understanding thermal barrier coating high temperature corrosion mechanism, optimize its design of material, important test platform is provided.
Claims (8)
1. the test unit of a simulation and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, this test unit comprises experimental test platform, and the high temperature corrosion Service Environment analog module, cooling system, exhaust system, complex impedance spectra measuring system, acoustic emission detection system, temperature test acquisition system, controlling test and the display platform that are connected with this experimental test platform respectively;
Described experimental test platform is installed the sample holding device be made up of sample clamp (101) and fixture fixing device (102), specimen holder (101) can rotate certain angle with installation shaft, and specimen holder (101) is manufactured with difform sample connector, can test discoid, tabular, cylindric, actual turbo blade shape four kinds of difform samples (104); Sample holding device is positioned in the sample chamber (103) that is made up of the quartz glass of corrosion-and high-temp-resistant, sample chamber (103) has hole, acoustic emission detection system detect with waveguide rod, complex impedance spectra measuring system with electrode with and temperature thermocouple passing hole be connected sample (104); On experimental test platform, be provided with can along the gun fixture of test board guide rail movement (106) in the side of sample chamber (103), gun fixture (106) arranges high-temperature fuel gas spray gun (105), and its nozzle can stretch in sample chamber; Top, sample chamber (103) is provided with infrared thermometer (107); The below of sample chamber (103) is placed with complex impedance spectra measuring system (121), acoustic emission detection system (123), temperature test acquisition system (115), in order to detect the etch state of thermal barrier coating sample, damage development and change of temperature field situation in real time, the below of sample chamber (103) is also provided with controlling test and the display platform (125) of control device work and display working;
Described high temperature corrosion Service Environment analog module is made up of a high-temperature fuel gas spray gun (105) and input system thereof, arranges corrosive particles transfer passage in high-temperature fuel gas spray gun, wherein, input system comprises combustion gas input system, oxygen input system, corrosive particles input system, combustion gas input system is made up of fuel cartridge (110) and corresponding flow valve, oxygen input system is made up of oxygen tank (111) and corresponding flow valve, corrosive particles input system comprises corrosive particles storer (108), forcing pump (112), flow valve (113), particle in corrosive particles storer (108) pours in high-temperature fuel gas spray gun (105) by forcing pump (112), the flow of particle is controlled by flow valve (113),
Described cooling system has two kinds, a kind of air cooling to sample, comprises air compressor (116), airmeter (117), cooling duct (118); Refrigerating gas in air compressor (116) is flowed into by the bottom of hollow sample cooling duct, after cooling, flows out from the top of cooling duct, to obtain the thermograde in a coating thickness direction to sample; Two is the water-cooleds to gas spray gun, and in cooling water tank, current are circulated between spray gun and cooling water tank at two through cooling duct entrance by the control of flow valve;
This test unit carries out NaCl, Na to cylindric thermal barrier coating
2sO
4or V
2o
5the step of single corrosive medium simulation test and real-time testing is:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs;
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By NaCl, Na
2sO
4or V
2o
5join in the memory block of corrosive particles storer (108) respectively;
3rd step: start acoustic emission detection system (123), open testing software, set threshold value experiment parameter; Start ac impedance spectral measurement system, open testing software, set frequency range, voltage magnitude experiment parameter;
4th step: starting characteristics test device, open software is set, setting sample heating temperature be 900 DEG C, adjustments grain flux is 20mg/s, arrange sample load mode be each thermal cycle mode be heat time 10s, temperature retention time is 300s, cool time 200s;
5th step, opens air compressor (116), opens combustion gas input system, oxygen input system, spray gun firing system successively; After even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), particle is transported in the firing chamber of spray gun, and after fully mixing with flame, molten state erosion is ejected into specimen surface with flame; Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample;
6th step: when the circulating cooling stage observe sample (104) ftracture or occur disbonding time, stop test, record times of thermal cycle;
7th step: data processing: utilize Zview software, uses Equivalent Circuit Fitting experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Extract thermal barrier coating high temperature NaCl, Na
2sO
4or V
2o
5the frequecy characteristic of the acoustic signals launched when different crackle is formed during corrosion, judges the type of crackle, and carries out quantitative test;
This test unit carries out Na to cylindric thermal barrier coating
2sO
4and V
2o
5the step of both corrosion simulated tests of combination and real-time testing is:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs;
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By Na
2sO
4and V
2o
5join in subregion corresponding to corrosive particles storer (108); Set the data acquisition parameters of each instrument;
3rd step: start acoustic emission detection system (123), open testing software, set threshold value experiment parameter; Start ac impedance spectral measurement system, open testing software, set frequency range, voltage magnitude experiment parameter;
4th step: starting characteristics test device, opens and arranges software, and setting sample heating temperature is 900 DEG C, regulates Na
2sO
4with V
2o
5discharging mass ratio be 4:6, adjustment grain flux is 20mg/s, arrange sample load mode for each thermal cycle mode be heat time 10s, temperature retention time is 300s, cool time 200s;
5th step: open air compressor (116), open combustion gas input system, oxygen input system, spray gun firing system successively, after even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), automatically control Na
2sO
4with V
2o
5discharging mass ratio, particle is transported in the firing chamber of spray gun, and after fully mixing with flame, molten state erosion is ejected into specimen surface with flame; Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample;
6th step: when the circulating cooling stage observe sample (104) ftracture or occur disbonding time, stop test, record times of thermal cycle;
7th step: data processing: utilize Zview software, uses Equivalent Circuit Fitting experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Extract thermal barrier coating high temperature Na
2sO
4+ V
2o
5the frequecy characteristic of the acoustic signals launched when different crackle is formed during corrosion, judges the type of crackle, and carries out quantitative test;
This test unit to the step that cylindric thermal barrier coating carries out the corrosion simulated test of CMAS and real-time testing is:
The first step: 2 testing impedance electrodes (122) are welded on the Free Surface of sample substrate by the mode of spot welding and have plated the surface ceramii layer of platinum or gold electrode, another termination complex impedance spectra measuring system (121); 2 wave guide acoustic emissions (124) are welded in the two ends of sample substrate respectively, the sensor of another termination acoustic emission detection system (123); Infrared thermometer (107), 1 thermopair (114) are fixed on sample surface ceramii layer, 1 thermopair (114) is fixed on sample substrate surface, 1 thermopair (114) is fixed on cooling duct bottom inlet, 1 thermopair (114) is fixed on cooling duct top exit, the other end jointing temp test acquisition system of all thermopairs;
Second step: be fixed on by sample (104) on sample clamp (101), sample bottom connects cooling duct (118), the distance between adjustment sample (104) and high-temperature fuel gas spray gun (105); By CaO, MgO, Al
2o
3and SiO
2pressed powder mixes by a certain percentage, joins the CMAS memory block of corrosive particles storer (108);
3rd step: start acoustic emission detection system (123), open testing software, set threshold value experiment parameter; Start ac impedance spectral measurement system, open testing software, set frequency range, voltage magnitude experiment parameter;
4th step: starting characteristics test device, opens and arranges software, and setting sample heating temperature is 1250 DEG C, and adjustment grain flux is 20mg/s, arranges sample load mode for keeping sample heating temperature to be 1250 DEG C of continuous heating 2h;
5th step: open air compressor (116), open combustion gas input system, oxygen input system, spray gun firing system successively, after even flame is stable, open forcing pump (112) and corrosive particles flow valve (113), CMAS particle is transported in the firing chamber of spray gun, after fully mixing with flame, the CMAS erosion of molten state is ejected into specimen surface with flame; Meanwhile running temperature test acquisition system, acoustic emission detection system, complex impedance spectra measuring system, the change of temperature field of the turbo blade sample of real-time testing and recording strip thermal barrier coating; Real time record acoustie emission event number, amplitude, energy, Ring-down count; Routine test and record the impedance of different corrosion stage sample;
6th step: arrive setting-up time or stop test when sample (104) ftractures or occur disbonding;
7th step: data processing: utilize Zview software, carries out matching with equivalent electrical circuit to experimental data, analyzes the increasing law of TGO thickness and the differentiation of ceramic layer micromechanism; Analyze the sound emission signal characteristic of thermal barrier coating high temperature CMAS corrosion, analyze the mechanism that thermal barrier coating CMAS destroys.
2. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, described high-temperature fuel gas spray gun (105) can be moved on the horizontal guide rail of experimental test platform by Serve Motor Control erecting device (106), realizes heated perimeter 20-1700 DEG C of sample adjustable; Realize the various corrosive medium of thermal barrier coating from most LMP V
2o
5: 690 DEG C, arrive comparatively high melting-point substance C aO-MgO-Al
2o
3-SiO
2fusing point: the melting of 1240 DEG C.
3. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, corrosive particles storer (108) dividing plate is divided into four memory blocks, stores NaCl respectively, Na
2sO
4, V
2o
5with CMAS corrosive deposit, these four kinds of materials can combination in any, and realize corrosive medium kind adjustable, with the simulation of Simulation of Complex corrosion environment, grain flux is 0-250g/min.
4. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, described exhaust system comprises the air-suction cover (119) and purification plant (120) that hang on top, sample chamber (103), air-suction cover is for absorbing the waste gas in sample chamber (103), purification plant absorbs corrosive particles and toxic gas for filtering, waste gas reaches environmental protection standard after purification plant process, just can directly enter in air.
5. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, the 1260+1296 type complex impedance spectra measuring system that described complex impedance spectra measuring system (121) is produced for Solartron company of Britain, be integrated in experimental test platform, the connecting line of instrument is connected with test electrode (122) by the hole on sample chamber (103), the internal structure change of thermal barrier coating and the Growth trends information of TGO under acquisition high temperature corrosion condition.
6. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, described acoustic emission detection system (123) is for sensitivity is 10
-8the PCI-2 acoustic emission detection system of cm magnitude, be integrated in experimental test platform, the connecting line of instrument is connected with waveguide rod (124) by the hole on sample chamber (103), realizes the real-time detection of the germinating to thermal barrier coating internal fissure under high temperature corrosion condition, expansion and location.
7. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, described temperature test acquisition system comprises thermopair (114) and infrared thermometer (107), temperature indicator (115), be integrated in experimental test platform, thermopair is connected with the temperature indicator on display platform (125) with controlling test, measure the temperature in sample internal channel and refrigerating gas exit, realize the temperature test of specified location; Infrared thermometer is for measuring the temperature field of specimen surface.
8. the test unit of a kind of simulation according to claim 1 and the corrosion of real-time testing thermal barrier coating high temperature deposition thing, it is characterized in that, described controlling test and display platform (125) are used for the operation of Control experiment test platform and detection system and display, comprise all mechanical drive, the opening of checkout equipment, simultaneous display experiment parameter and experimental result, realize the synchronous operation that Service Environment simulation test and failure performance are tested.
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