CN110823715A - System and method for testing fracture toughness of thermal barrier coating - Google Patents
System and method for testing fracture toughness of thermal barrier coating Download PDFInfo
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- CN110823715A CN110823715A CN201911157727.XA CN201911157727A CN110823715A CN 110823715 A CN110823715 A CN 110823715A CN 201911157727 A CN201911157727 A CN 201911157727A CN 110823715 A CN110823715 A CN 110823715A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0064—Initiation of crack
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
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- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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Abstract
The invention discloses a system and a method for testing fracture toughness of a thermal barrier coating. The system comprises: the universal material testing machine comprises a movable cross beam and a measuring table; the bottom of the support is fixed on the measuring table, and the upper part of the support is used for supporting the thermal barrier coating; one end of the pressure rod is connected with the movable beam, so that when the movable beam moves downwards, the pressure rod is driven to press the thermal barrier coating; the heating furnace is arranged in the universal material testing machine, and the top of the heating furnace is provided with a first through hole for the compression bar to pass through; a second through hole for the support piece to pass through is formed in the bottom of the heating furnace; the acoustic emission detector is connected with the thermal barrier coating, an acoustic emission phenomenon is generated when the pressing rod presses the thermal barrier coating, and the acoustic emission detector acquires the change of the number of the acoustic emission events of the thermal barrier coating along with time. The device can test the fracture toughness of the surface and the interface of the thermal barrier coating, and has the advantages of simple equipment, convenient operation, strong feasibility, high test temperature and high test sensitivity.
Description
Technical Field
The invention belongs to the field of coating materials, and particularly relates to a system and a method for testing fracture toughness of a thermal barrier coating.
Background
The thermal barrier coating has good heat insulation, wear resistance and corrosion resistance, and becomes a key thermal protection material in the engine. However, due to the complex structure and the bad service environment of the thermal barrier coating system, the coating is often cracked and peeled off to cause the failure of the coating, even to cause catastrophic accidents. Therefore, the research on the failure mode of the thermal barrier coating and the acquisition of key mechanical parameters (such as surface fracture toughness and interface fracture toughness) of the thermal barrier coating can provide a basis for the life prediction and reliability evaluation of the thermal barrier coating and are important contents of failure research.
At present, many devices and methods for researching the fracture toughness of a thermal barrier coating are provided, and all the devices and methods are used for testing the fracture toughness of the thermal barrier coating at normal temperature, including the fracture toughness of the surface and the interface, and are lack of devices and methods for in-situ characterization of the fracture toughness of the surface and the interface of the thermal barrier coating at high temperature.
Disclosure of Invention
Objects of the invention
The invention aims to provide a system for testing the fracture toughness of a thermal barrier coating, which can be used for in-situ characterization of the fracture toughness of the surface and the interface of the thermal barrier coating in a high-temperature environment.
(II) technical scheme
To solve the above problems, a first aspect of the present invention provides a system for testing fracture toughness of a thermal barrier coating, comprising: the universal material testing machine comprises a movable cross beam and a measuring table; one end of the support piece is fixed on the measuring table, and the other end of the support piece is used for supporting the thermal barrier coating; one end of the pressure rod is connected with the movable cross beam, so that when the movable cross beam moves downwards, the pressure rod is driven to press the thermal barrier coating, and the universal material testing machine can obtain the change of the load of the thermal barrier coating along with time; the resistance furnace is arranged in the universal material testing machine, the top of the resistance furnace is provided with a first through hole for the pressure rod to pass through, and the bottom of the resistance furnace is provided with a second through hole for the support rod to pass through; the resistance furnace is used for providing a test temperature for the thermal barrier coating; and the acoustic emission detector is connected with the thermal barrier coating and is used for acquiring the change of the number of acoustic emission events of the thermal barrier coating along with time when the pressure bar presses towards the thermal barrier coating.
The invention aims to protect a device for testing the high-temperature fracture toughness of a thermal barrier coating, solves the problem of in-situ characterization of the high-temperature fracture toughness of the thermal barrier coating, can test the fracture toughness of the surface and interface of the thermal barrier coating, and has the advantages of simple equipment, convenience in operation, strong feasibility, high test temperature and high test sensitivity.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
the system for testing the high-temperature fracture toughness of the thermal barrier coating solves the important problem that the time for generating cracks cannot be really determined by a single load-time curve, so that the real fracture load cannot be obtained. The system provided by the embodiment of the invention can capture and acquire the time of crack generation in real time by combining with the acoustic emission instrument which is carried out synchronously, and the principle is that stress waves are generated due to stress in a test in the bending process, the stress waves captured by the acoustic emission instrument through the probe are converted into electric signals, and each time the stress waves are captured, the electric signals are recorded as a primary event. Since the number of events is rapidly increased due to a rapid increase in the stress wave occurring when the crack is generated, the time at which the crack is generated can be determined from the change of the time-event number curve, and the actual load and the actual displacement at which the crack is generated can be determined from the time.
Drawings
FIG. 1 is a schematic block diagram of a system for testing fracture toughness of a thermal barrier coating according to an embodiment of the present invention;
FIG. 2 is a system diagram illustrating fracture toughness of a thermal barrier coating according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of the strut;
FIG. 4 is a schematic structural view of the support member;
FIG. 5 is a schematic view of the movable member;
FIG. 6 is a schematic structural view of a cooling water pipe according to an embodiment of the present invention;
FIG. 7 is a graph showing a displacement-time curve obtained by the universal material testing machine according to an embodiment of the present invention;
FIG. 8 is a schematic view of a load-time-event number curve according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of calculating fracture toughness of a thermal barrier coating according to an embodiment of the present invention.
Reference numerals
1: a universal material testing machine; 11: moving the beam; 111: a fixed part; 12: a measuring table; 2: a clamp; 21: a support member; 211: a base; 212: a support bar; 2121: a boss portion; 213: a groove; 22: a pressure lever; 23: a movable member; 3: a resistance furnace; 4: an acoustic emission detector; 41: a waveguide rod; 42: an acoustic emission probe; 43: a signal amplifier; 44: an acoustic emission host; 5: a cooling water pipe; 6: a thermal barrier coating; 61: a thermal barrier coating substrate; 62: a layer of ceramic material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In the drawings a schematic view of a layer structure according to an embodiment of the invention is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
FIG. 1 is a schematic diagram of a system for testing fracture toughness of a thermal barrier coating according to an embodiment of the invention.
As shown in FIG. 1, the system for testing fracture toughness of thermal barrier coating comprises: universal material testing machine 1, clamp 2, resistance furnace 3 and acoustic emission appearance 4. Wherein the clamp 2 comprises a support 21 and a press rod 22.
The universal material testing machine 1 includes a movable beam 11 and a measuring table 12.
Alternatively, a fixing portion 111 is provided at a middle portion of the lower surface of the movable beam 11, and the supporting member 21 may be connected to the fixing portion 11, for example, by bolts.
A support 21, the bottom of which is fixed on the measuring table 12 and the upper of which is used for supporting the thermal barrier coating 6.
It is noted that the thermal barrier coating 6 comprises a layer 62 of ceramic material and a substrate 61, preferably with the support 21 abutting against the layer of ceramic material.
One end of the compression bar 22 is connected with the movable beam 11, the other end of the compression bar is abutted with the thermal barrier coating 6, preferably, the other end of the compression bar is abutted with the substrate 61, so that when the movable beam 11 moves downwards, the compression bar 21 is driven to be pressed towards the thermal barrier coating 6, and the universal material testing machine 1 can obtain the change of the load of the thermal barrier coating along with the time.
And the heating furnace 3 is arranged in the universal material testing machine 1, the top of the heating furnace is provided with a first through hole for the compression bar 22 to pass through, and the bottom of the heating furnace is provided with a second through hole for the support bar 21 to pass through.
And the heating furnace 3 is used for providing a test temperature for the thermal barrier coating.
Optionally, the heating furnace 3 is a resistance furnace.
And the acoustic emission detector 4 is connected with the thermal barrier coating 6 and is used for acquiring the change of the number of acoustic emission events of the thermal barrier coating along with time when the pressure bar 21 presses towards the substrate 61 of the thermal barrier coating 6. Namely, when the pressure bar 21 presses towards the thermal barrier coating, an acoustic emission phenomenon is generated, and the acoustic emission detector acquires the change of the number of the acoustic emission events of the thermal barrier coating along with time.
Preferably, the acoustic emission instrument 4 is connected to the substrate 61.
In the above embodiment of the invention, the resistance furnace is additionally arranged in the universal material testing machine, so that the universal material testing machine can test the fracture toughness of the thermal barrier coating at high temperature, the change of the number of acoustic emission events of the thermal barrier coating along with time is obtained through the acoustic emission instrument, and the change of the load of the thermal barrier coating along with time and the change of the displacement of the thermal barrier coating along with time are obtained through the universal material testing machine. The device can obtain a load-time-event number curve, so that the problem that the time for generating cracks cannot be really determined by a simple load-time curve is solved, the high-temperature fracture toughness of the thermal barrier coating can be represented in situ, and the device is simple, convenient to operate, high in feasibility, high in testing temperature and high in testing sensitivity.
In one embodiment, the system further comprises a cooling water pipe 5 arranged on the outer wall of the electric resistance furnace 3. Preferably, the cooling water pipe 5 contains flowing cooling water therein. Optionally, one end of the cooling water pipe 5 is connected with a water tap, the other end is arranged in the container, and the flowing water is used for cooling the outer wall of the resistance furnace.
Fig. 6 is a schematic structural view of a cooling water pipe according to an embodiment of the present invention.
As shown in fig. 6, the cooling water pipes are arranged in a shape of "u" and closely arranged on the outer wall of the resistance furnace to increase the area covered by the water flow, so that the temperature of the outer wall of the resistance furnace is reduced as much as possible.
Fig. 2 is a system schematic diagram of fracture toughness of a thermal barrier coating according to an embodiment of the invention, fig. 3 is a schematic diagram of a compression bar, and fig. 4 is a schematic diagram of a support. Fig. 5 is a schematic view of the structure of the movable member.
As shown in fig. 2 to 5, the support 21 includes a base 211 and a support rod 212; one end of the base 211 is fixed on the measuring table, and the other end is provided with a groove for placing and fixing the support rod 212; one end of the support rod 212 is arranged in the groove, and the other end of the support rod is abutted to the thermal barrier coating 6.
In one embodiment, the end of the support rod 212 abutting the thermal barrier coating 6 is provided with two opposite protrusions 2121, and the protrusions 2121 are used for supporting the thermal barrier coating.
In one embodiment, the clamp 2 further comprises: the two ends of the movable piece 23 are provided with two parallel supporting parts which are positioned on the same side of the movable piece 23; the support abuts the layer 62 of ceramic material of the thermal barrier coating 6.
A groove 213 for accommodating the movable element 23 is left between the two protrusions 2121, and the length of the groove is greater than that of the movable element 23 in the radial direction of the support rod 212. This allows the mobile element 23 to have a certain accommodation space, which allows the relative position between the thermal barrier coating 6 and the compression bar to be adjusted by adjusting the position of the mobile element 23 in the recess 213. For example by adjusting the position of the mobile element 23 so that the axis of the strut 22, the centre of the thermal barrier coating 6, the axis of the mobile element 23, the support 21 are collinear.
In one embodiment, the axis of the strut 22, the center of the thermal barrier coating, the axis of the moveable member 23, and the axis of the support member 21 are collinear, which allows accurate results of the test.
In one embodiment, the acoustic emission detector 4 includes a waveguide rod 41, an acoustic emission probe 42, a signal amplifier 43, and an acoustic emission host 44 connected in series.
In one embodiment, the waveguide rod 41 is further connected to the substrate 61 of the thermal barrier coating, preferably, the waveguide rod 41 is connected to the substrate 61 of the thermal barrier coating by welding, further preferably, the waveguide rod has a diameter of 2-3mm, and further preferably, the waveguide rod 41 is made of nickel.
It should be noted that the acoustic emission detector 4 needs to be connected to the substrate 61, and on the one hand, the ceramic material layer is a ceramic material and is not easily connected to the waveguide rod of the acoustic emission detector 4. On the other hand, if the waveguide rod 41 of the acoustic emission instrument 4 is directly welded to the ceramic material layer 62 of the thermal barrier coating 6, the ceramic material layer 6 is easily affected by the solder, and during the test of the acoustic emission detector, the test result is easily affected by the solder, which results in an error.
And the acoustic emission host 44 is used for processing the stress wave signal acquired by the waveguide rod 41 to obtain the change of the number of acoustic emission events along with time. And determining the time for generating cracks on the interface of the thermal barrier coating based on the change of the load of the thermal barrier coating along with the time and the change of the number of acoustic emission events of the thermal barrier coating along with the time.
In one embodiment, the inner wall of the resistance furnace is provided with heating rods.
In a specific embodiment, the heating temperature of the heating rod is from room temperature to 1200 ℃.
Preferably, the support member 21, the pressing rod 22 and the movable member 23 are made of silicon carbide. Silicon carbide materials have the advantage of being resistant to high temperatures, which further enables the system to test the fracture toughness of thermal barrier coatings at high temperatures.
Optionally, the heating furnace is of a cuboid structure and is provided with a furnace door, one side opposite to the furnace door is provided with a through hole for the waveguide rod to pass through, and one side opposite to the furnace door is provided with a window for observation.
In one embodiment, the diameter of the first through hole is larger than the diameter of the strut 22, and the diameter of the second through hole is larger than the diameter of the support 21; this enables the strut and support 21 to pass through the first and second through holes such that the thermal barrier coating is disposed into the electric resistance furnace through the strut 22 and support 21.
Optionally, the difference between the diameter of the first through hole and the diameter of the pressure rod 22 is equal to the difference between the diameter of the second through hole and the diameter of the support member 21; preferably, the difference is less than or equal to 5 and less than or equal to 10 mm.
Preferably, the difference between the diameter of the first through hole and the diameter of the pressure lever 22 is less than 10mm, so that the volume expansion of the pressure lever and the extrusion of the furnace wall caused by heating are prevented, the friction extrusion of the furnace wall in the moving process of the pressure lever is prevented, and the heat leakage is reduced as much as possible; if the difference between the diameter of the second through hole and the diameter of the support member 21 is less than 5mm, on one hand, volume expansion is caused by heating, and on the other hand, if the difference between the diameter of the second through hole and the diameter of the support member 21 is set to be greater than or equal to 5mm, heat leakage can be reduced as much as possible.
The system for testing the fracture toughness of the thermal barrier coating provided by the embodiment of the invention has the advantages of simple structure, convenience in operation, strong feasibility, high testing temperature and high testing sensitivity, and can test the fracture toughness of the surface and the interface of the thermal barrier coating.
An embodiment of the present invention further provides a method for testing fracture toughness of a thermal barrier coating, comprising the following steps:
step S101, disposing a thermal barrier coating within the system of the first embodiment.
Specifically, the method comprises the following substeps 1-3:
step 1, obtaining a thermal barrier coating sample with a preset size and a preset shape, such as a plate shape; a waveguide rod is welded to one side of the thermal barrier coating substrate.
And 2, placing the sample welded with the waveguide rod on the support 21, wherein the waveguide rod 41 extends out through the opening of the resistance furnace 3.
And step 3, connecting the waveguide rod 41, the acoustic emission probe 42, the signal amplifier 43 and the acoustic emission host 44 in sequence.
And S102, setting a heating program of the heating furnace according to a preset test requirement.
For example, a temperature rise program of the resistance furnace 3 is set according to preset test requirements, and the test temperature is set, for example, the test temperature is set to 1200 ℃, the temperature rise time and the holding time are set, for example, the temperature is held for half an hour after the furnace temperature reaches the test temperature, and the holding time is more than 1 hour, so that the temperature is ensured not to drop in the test process.
And S103, setting the bending test rate of the universal material testing machine and the system threshold of the acoustic emission instrument, the amplification frequency and the sampling frequency of the preamplifier according to preset test requirements.
For example, the operating system of the universal material testing machine 1 is opened, the bending test rate is set to 0.2mm/min, the acoustic emission detector is opened, and the system threshold, the preamplifier and the sampling frequency are respectively set to 38dB, 40dB and 2 MHz.
Step S104, synchronously operating the universal material testing machine and the acoustic emission detector,
and 6, synchronously operating the universal material testing machine 1 and the acoustic emission detector 4. Wherein, the universal material testing machine 1 obtains a load-time curve and a displacement-time curve of a sample, and the acoustic emission detector 4 obtains a time-acoustic emission event number curve.
Therefore, the time, the displacement and the load generated by the surface crack and the interface crack of the thermal barrier coating can be determined through the load-time curve, the displacement-time curve and the time-acoustic emission event number curve of the sample, and the fracture toughness can be further calculated.
And S105, obtaining fracture toughness based on the data acquired by the universal material testing machine and the data acquired by the acoustic emission detector.
The method comprises the following steps of:
step 1, saving and exporting acoustic emission data in a txt format, wherein the saving result is that a total file and a series of subfiles are generated;
and 2, copying and pasting the total file to excel, dividing the data into columns, and converting the time into seconds. Referring to table 1 below, in table 1 below, M represents the number of minutes generated by the universal material tester test, S represents the number of seconds of time taken for the universal material tester test, and time (S) represents time converted into seconds.
TABLE 1
TABLE 2
And 4, based on the data acquired by the acoustic emission detector, taking time as an abscissa and taking the event number as an ordinate, and making a time-event number curve.
And 5, respectively drawing a load-time curve and a displacement-time curve based on the data acquired by the universal material testing machine. The graph of the displacement-time curve can be referred to fig. 7.
And 6, determining crack generation time and a corresponding load-time curve by using the turning point of the time-event number curve, and determining the crack load and the crack displacement by using the load-displacement curve respectively.
For example, the time for crack generation was determined to be 275s by point a shown in fig. 8, and the load corresponding to 275s was determined to be point B, i.e., 555N, and the displacement was determined on the displacement-time curve obtained by the universal material testing machine by 275 s.
Step 7, calculating the surface fracture toughness K1. FIG. 9 is a schematic diagram illustrating the principle of calculating the fracture toughness of a thermal barrier coating according to an embodiment of the present invention, as shown in FIG. 9, calculating the fracture toughness K of a surface1The formula of (1) is as follows:
σ＝Ecy/ρ
ρ＝[(L/2)2+δ2]/2δ
y＝h0+hc
σ＝Ecy/ρ
ρ＝[(L/2)2+δ2]/2δ
y＝h0+hc
wherein, KIIn order to obtain the surface fracture toughness, delta is the displacement of the coating during cracking, and is determined by a time-acoustic emission curve and a displacement-time curve together, other parameters can be obtained by measurement, and the other parameters have the meanings as follows:
a0critical crack length;
sigma is the critical stress of the coating fracture, namely the normal stress generated by bending;
Y1is a geometric form factor;
Ecis the elastic modulus of the ceramic layer, hcIs the thickness of the ceramic layer;
Esis the modulus of elasticity of the substrate, hsIs the substrate thickness;
h0the distance from the ceramic layer/bond layer interface to the neutral axis;
y is the distance from the coating to the neutral axis of the composite beam;
ρ is a curvature radius.
The invention aims to protect a device and a method for testing the high-temperature fracture toughness of a thermal barrier coating, the device and the method solve the problem of in-situ characterization of the high-temperature fracture toughness of the thermal barrier coating, can test the fracture toughness of the surface and the interface of the thermal barrier coating, and have the advantages of simple equipment, convenience in operation, strong feasibility, high test temperature and high test sensitivity.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A system for testing fracture toughness of a thermal barrier coating, comprising:
the universal material testing machine (1) comprises a movable beam (11) and a measuring table (12);
a support (21) fixed at the bottom on the measuring table (12) and at the top for supporting the thermal barrier coating (6);
a pressure rod (22), one end of which is connected with the moving beam (11) so as to drive the pressure rod (21) to press the thermal barrier coating (6) when the moving beam (11) moves downwards;
the heating furnace (3) is arranged in the universal material testing machine (1), and a first through hole for the compression bar (22) to pass through is formed in the top of the heating furnace; the bottom of the heating furnace (3) is provided with a second through hole for the support piece (21) to pass through; the resistance furnace is used for providing a test temperature for the thermal barrier coating;
and the acoustic emission detector (4) is connected with the thermal barrier coating (6) and is used for acquiring the change of the number of acoustic emission events of the thermal barrier coating along with time when the pressure rod (21) presses the thermal barrier coating (6).
2. The system of claim 1, further comprising
The cooling water pipe (5) is arranged on the outer wall of the resistance furnace (3); preferably, the cooling water pipe (5) contains flowing cooling water therein; preferably, the cooling water pipe (5) is provided in a shape of a Chinese character 'ji'.
3. The system according to claim 1 or 2,
the support (21) comprises a base (211) and a support rod (212);
one end of the base (211) is fixed on the measuring table (12), and the other end of the base is provided with a groove for placing and fixing the supporting rod (212);
one end of the supporting rod (212) is arranged in the groove, and the other end of the supporting rod is used for supporting and fixing the thermal barrier coating (6).
4. The system of claim 3,
and one end of the support rod (212) abutted to the thermal barrier coating (6) is provided with two opposite bulges (2121), and the bulges (2121) are used for supporting the thermal barrier coating (6).
5. The system of claim 4, further comprising:
the two ends of the moving part (23) are provided with two parallel supporting parts which are positioned on the same side; the support is in abutment with the thermal barrier coating (6);
a groove (213) for accommodating the movable piece (23) is reserved between the two convex parts (2121); in the radial direction of the support rod (212), the length of the groove (213) is greater than the length of the movable piece (23).
6. System according to claim 5, characterized in that the axis of the strut (22), the centre of the thermal barrier coating (6), the axis of the mobile element (23), the axis of the support (21) are collinear.
7. The system according to any one of claims 1 to 6, characterized in that the acoustic emission detector (4) comprises a waveguide rod (41), an acoustic emission probe (42), a signal amplifier (43) and an acoustic emission host (44) which are connected in sequence;
the waveguide rod (41) is further connected with the substrate (61), preferably, the waveguide rod (41) is connected with the substrate (61) in a welding mode, further preferably, the diameter of the waveguide rod (41) is 2-3mm, and further preferably, the waveguide rod (41) is made of nickel;
the control device (44) is used for acquiring the change of the number of acoustic emission events of the thermal barrier coating along with time on the basis of the stress wave signal acquired by the waveguide rod (41);
and determining the time for generating cracks on the interface of the thermal barrier coating based on the change of the load of the thermal barrier coating along with the time and the change of the number of acoustic emission events of the thermal barrier coating along with the time.
8. The system of claim 7, wherein the system is a portable electronic device
The inner wall of the heating furnace is provided with a heating rod; and/or the heating temperature of the heating rod is between room temperature and 1200 ℃; preferably, the support (21), the pressure lever (22) and the mobile element (23) are made of silicon carbide material; and/or;
the heating furnace is of a cuboid structure and is provided with a furnace door, one side opposite to the furnace door is provided with a through hole for the waveguide rod to pass through, and the other side opposite to the furnace door is provided with a window for observation.
9. The system according to any one of claims 1 to 8,
the diameter of the first through hole is larger than that of the pressure rod (22), and the diameter of the second through hole is larger than that of the support piece (21);
the difference between the diameter of the first through hole and the diameter of the pressure lever (22) is equal to the difference between the diameter of the second through hole and the diameter of the support (21);
preferably, the difference between the diameter of the first through hole and the diameter of the pressure rod (22) is less than or equal to 5mm and less than or equal to 10 mm.
10. A method for testing fracture toughness of a thermal barrier coating is characterized by comprising the following steps:
disposing a thermal barrier coating within the system of any of claims 1-9;
setting a heating program of the heating furnace according to preset test requirements;
setting the bending test rate of the universal material testing machine and the system threshold value of the acoustic emission instrument, the amplification frequency and the sampling frequency of the preamplifier according to preset test requirements;
synchronously operating the universal material testing machine and the acoustic emission detector;
and obtaining the fracture toughness based on the data acquired by the universal material testing machine and the data acquired by the acoustic emission detector.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697629A (en) * | 2020-12-08 | 2021-04-23 | 武汉理工大学 | Device and method for measuring reliability of thermal barrier coating of piston |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10143679C1 (en) * | 2001-08-30 | 2002-10-10 | Dresden Ev Inst Festkoerper | Determining mechanical properties of thin coatings involves measuring force-displacement profile of coating on two-part bearer body stuck onto one-piece bearer body with gap |
| CN101614635A (en) * | 2009-04-17 | 2009-12-30 | 中国科学院上海硅酸盐研究所 | Multiphysics fatigue property test macro and method of testing |
| CN103091189A (en) * | 2013-01-10 | 2013-05-08 | 湘潭大学 | Tester for simulating service environment of thermal barrier coating and detecting failure of thermal barrier coating in real time |
| CN103439413A (en) * | 2013-08-07 | 2013-12-11 | 湘潭大学 | Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating |
| CN103728186A (en) * | 2013-12-26 | 2014-04-16 | 清华大学 | On-line observable high-temperature three-point bend test system |
| CN104075941A (en) * | 2014-06-12 | 2014-10-01 | 湘潭大学 | In-situ synchronous test method and device for fracture toughness and residual stress of fragile material |
| CN109459286A (en) * | 2018-12-10 | 2019-03-12 | 湘潭大学 | Real-time detection method is damaged in a kind of thermal barrier coating of turbine blade simulation test procedure |
| CN109781761A (en) * | 2018-12-27 | 2019-05-21 | 西安交通大学 | A kind of superhigh temperature under scanning electron microscope is broken in-situ observation device |
| CN109883871A (en) * | 2019-03-21 | 2019-06-14 | 湘潭大学 | A kind of detection method of thermal barrier coating high temperature corrosion |
| CN110031330A (en) * | 2019-03-07 | 2019-07-19 | 航天科工防御技术研究试验中心 | A kind of test sample, preparation method and the test method of ceramic coating bond strength |
-
2019
- 2019-11-22 CN CN201911157727.XA patent/CN110823715A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10143679C1 (en) * | 2001-08-30 | 2002-10-10 | Dresden Ev Inst Festkoerper | Determining mechanical properties of thin coatings involves measuring force-displacement profile of coating on two-part bearer body stuck onto one-piece bearer body with gap |
| CN101614635A (en) * | 2009-04-17 | 2009-12-30 | 中国科学院上海硅酸盐研究所 | Multiphysics fatigue property test macro and method of testing |
| CN103091189A (en) * | 2013-01-10 | 2013-05-08 | 湘潭大学 | Tester for simulating service environment of thermal barrier coating and detecting failure of thermal barrier coating in real time |
| CN103439413A (en) * | 2013-08-07 | 2013-12-11 | 湘潭大学 | Acoustic emission signal analytical method for automatically identifying damage mode of thermal barrier coating |
| CN103728186A (en) * | 2013-12-26 | 2014-04-16 | 清华大学 | On-line observable high-temperature three-point bend test system |
| CN104075941A (en) * | 2014-06-12 | 2014-10-01 | 湘潭大学 | In-situ synchronous test method and device for fracture toughness and residual stress of fragile material |
| CN109459286A (en) * | 2018-12-10 | 2019-03-12 | 湘潭大学 | Real-time detection method is damaged in a kind of thermal barrier coating of turbine blade simulation test procedure |
| CN109781761A (en) * | 2018-12-27 | 2019-05-21 | 西安交通大学 | A kind of superhigh temperature under scanning electron microscope is broken in-situ observation device |
| CN110031330A (en) * | 2019-03-07 | 2019-07-19 | 航天科工防御技术研究试验中心 | A kind of test sample, preparation method and the test method of ceramic coating bond strength |
| CN109883871A (en) * | 2019-03-21 | 2019-06-14 | 湘潭大学 | A kind of detection method of thermal barrier coating high temperature corrosion |
Non-Patent Citations (1)
| Title |
|---|
| WEIGUO MAO 等: "In situ characterizations of mechanical behaviors of freestanding (Gd0.9Yb0.1)2Zr2O7 coatings by bending tests under different temperatures based on digital image correlation", 《JOURNAL OF THE EUROPEAN CERAMIC SOCIETY》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697629A (en) * | 2020-12-08 | 2021-04-23 | 武汉理工大学 | Device and method for measuring reliability of thermal barrier coating of piston |
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