CN113777026A

CN113777026A - High-flux multi-target rapid testing device and method for material bonding strength and structure

Info

Publication number: CN113777026A
Application number: CN202111008961.3A
Authority: CN
Inventors: 明平文; 董帆; 杨代军; 肖强凤; 李冰; 张存满
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-12-10

Abstract

The invention relates to a high-flux multi-target rapid testing device and method for material bonding strength and structure, wherein the device comprises: a clamp (16): the device is used for clamping and packaging a plurality of tested pieces (5), and the tested pieces (5) are dispersedly packaged in a sealed space of the clamp (16); the test system comprises: and the sealed space is communicated with the clamp (16) and is used for providing high and low temperature or dry and wet cycle impact to the tested piece (5). Compared with the prior art, the method can quickly evaluate the durability of the adhesive with different structures after high and low temperature impact and dry and wet circulation.

Description

High-flux multi-target rapid testing device and method for material bonding strength and structure

Technical Field

The invention relates to the technical field of bonding material testing, in particular to a high-flux multi-target rapid testing device and method for material bonding strength and structure.

Background

The adhesive is used for bonding different components, so that the relative positions of the components are fixed, and meanwhile, the air tightness and the water tightness between the components are ensured. In Proton Exchange Membrane Fuel Cells (PEMFC), a large amount of binder is required, and its function is to ensure firm adhesion of the proton exchange membrane, frame, carbon paper or electrode plate to each other in each fuel cell. The vehicle PEMFC needs to work under various working conditions, such as working temperature of-30-90 ℃, humidity of 0-100% RH, alternating potential, certain pressure, fluoride ions and acidity; in this case, the adhesive still needs to maintain excellent durability in various severe environments such as high and low temperature impact or alternation of dry and wet, and still ensure certain bonding strength, air tightness and water tightness after high cycle number of cycle impact. Of course, the excellent adhesive performance can depend on the material properties and durability of the adhesive itself, and also depends on the structure of the various members to be adhered. By changing the cross-sectional shape of the substrate in the bonding region, different bonding agent structures (as shown in fig. 5) can be obtained, and the sealing performance between the components can be changed differently, so that the sealing performance and the durability under the specific environment of the fuel cell are also required to be evaluated quickly by establishing a set of methods. In view of the above, the present invention provides a device capable of rapidly evaluating the durability of the adhesive and the adhesive structure thereof in the high and low temperature and alternating dry and wet environments of PEMFC.

Chinese patent CN211586648U discloses a high and low temperature damp and heat test chamber, which is composed of a chamber body and a chamber door, wherein a multi-layer supporting plate is arranged in the chamber for placing a test piece, and a sliding block, a sliding rail and a limiting component are arranged on the inner wall of the chamber for adjusting the distance between the inner layers of the chamber and testing products with different heights. The product is not designed for testing the adhesive material, and cannot realize the function of quickly switching between high and low temperature and dry and wet, so that the durability of the adhesive material cannot be quickly evaluated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a high-flux multi-target rapid testing device and method for material bonding strength and structure.

The purpose of the invention can be realized by the following technical scheme:

a high-flux multi-target rapid testing device for material bonding strength and structure comprises:

a clamp: the device comprises a clamp, a plurality of clamping pieces and a plurality of clamping pieces, wherein the plurality of clamping pieces are used for clamping and packaging a plurality of tested pieces which are packaged in a sealing space of the clamp in a dispersed manner;

the test system comprises: and the sealing space is communicated with the clamp and is used for providing high and low temperature or dry and wet cycle impact to the tested piece.

Preferably, the fixture comprises a box body and a cover plate, the side surface of the box body is provided with an opening, the cover plate is fixed on the opening surface of the box body through a sealing ring in a sealing manner, the box body and the cover plate are provided with a plurality of fixing structures used for clamping a tested piece, the fixing structures fix the tested piece along the vertical direction, and the box body is provided with a pipeline interface used for communicating the testing system.

Preferably, fixed knot construct including set up in the box with the relative one side lateral wall of apron on the joint spare, the joint spare be used for to be surveyed four angles joint of piece fixed, fixed knot construct still including the support column that sets up on the apron, the apron install the back in place, the support column contradict by survey the piece.

Preferably, the fixture further comprises a supporting foot frame, and the box body is fixed on the test table top through the supporting foot frame.

Preferably, the test system comprises an air source, an air inlet adjusting component, an air regulator, a safety protection component and an output feedback component, wherein the input end of the wet and dry device is connected with the air source through the air inlet adjusting component, the output end of the wet and dry device is connected with the air inlet pipeline interface of the clamp through the safety protection component, the wet and dry device is provided with a temperature sensor, and the output feedback component is connected with the exhaust pipeline interface of the clamp.

Preferably, the gas regulator is configured as one of a dehumidifier or a temperature regulator.

Preferably, the air inlet adjusting assembly comprises a pressure reducing valve, a pressure sensor and a normally closed solenoid valve which are connected in sequence.

Preferably, the safety includes components including a pressure sensor and a safety valve.

Preferably, the output feedback assembly comprises a sensor and a back pressure valve which are connected in sequence, and the sensor comprises a pressure sensor, a humidity sensor and a temperature sensor.

A high-flux multi-target rapid test method for material bonding strength and structure is based on the device and comprises the following steps:

the tested piece is packaged in the sealing space of the clamp in a dispersed mode;

the test system provides high and low temperature or dry and wet cycle impact to the tested piece;

and taking down the tested piece to perform a shear strength test.

Compared with the prior art, the invention has the following advantages:

(1) the clamp can quickly evaluate the durability of the adhesive with different structures after high and low temperature impact and dry and wet circulation.

(2) The invention can be equipped with a plurality of batches of tested pieces to carry out high-throughput testing, thereby saving testing time.

(3) The volume of the sealed space cavity in the clamp is small, so that the switching frequency of temperature and humidity is convenient to increase.

(4) The test system can be used for cycling in a large temperature and humidity range and is suitable for various objects and working conditions.

Drawings

FIG. 1 is a front view of the clamp of the present invention;

FIG. 2 is a side view of the clamp of the present invention;

FIG. 3 is a schematic view of a snap-fit member in the case of the present invention;

FIG. 4 is a schematic view of the support posts in the cover plate of the fixture of the present invention;

FIG. 5 is another adhesive (interlayer) structure formed after the substrate has been altered in cross-sectional shape;

FIG. 6 is a schematic piping diagram of the test system;

FIG. 7 is a graph showing the results of the switching test of temperature 80 ℃ and humidity 0% RH and 80% RH.

In the figure, 1 is a box body, 2 is a cover plate, 3 is a pipeline interface, 4 is a supporting foot stand, 5 is a measured piece, 6 is a clamping piece, 7 is a pressure reducing valve, 8 and 9 are first pressure sensors, 10 and 11 are normally closed electromagnetic valves, 12 is a humidifier, 13 is a first humidity sensor, 14 is a second pressure sensor, 15 is a safety valve, 16 is a clamp, 17 is a third pressure sensor, 18 is a second humidity sensor, 19 is a temperature sensor, 20 is a back pressure valve, and 21 is a supporting column.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.

Examples

The embodiment provides a material bonding strength and structure high flux multi-target rapid test device, which comprises:

a clamp 16: the device is used for clamping and packaging a plurality of tested pieces 5, and the tested pieces 5 are dispersedly packaged in the sealed space of the clamp 16;

the test system comprises: and the sealed space of the clamp 16 is communicated, and is used for providing high and low temperature or dry and wet cycle impact to the tested piece 5.

As shown in fig. 1 and 2, the fixture 16 includes a box body 1 and a cover plate 2, the side surface of the box body 1 is open, the cover plate 2 is fixed on the open surface of the box body 1 through a sealing ring, a plurality of fixing structures for clamping the tested piece 5 are arranged on the box body 1 and the cover plate 2, the fixing structures fix the tested piece 5 along the vertical direction, and a pipeline interface 3 for communicating with a testing system is arranged on the box body 1. The fixture 16 further comprises support foot frames 4, the box body 1 is fixed on the test table through the support foot frames 4, and the number of the support foot frames 4 is 2 in the embodiment, so that the box body 1 is fixed on the test table.

As shown in fig. 3 and 4, the fixing structure comprises a clamping piece 6 arranged on the side wall of the box body 1 opposite to the cover plate 2, the clamping piece 6 is used for clamping and fixing four corners of the tested piece 5, the fixing structure further comprises a supporting column 21 arranged on the cover plate 2, and after the cover plate 2 is installed in place, the supporting column 21 is abutted to the tested piece 5.

The testing system comprises an air source, an air inlet adjusting component, an air regulator, a safety protection component and an output feedback component, wherein the input end of the dry-wet device 12 is connected with the air source through the air inlet adjusting component, the output end of the dry-wet device 12 is connected with the air inlet pipeline interface 3 of the clamp 16 through the safety protection component, the dry-wet device 12 is provided with a temperature sensor, and the output feedback component is connected with the exhaust pipeline interface 3 of the clamp 16. The air inlet adjusting assembly comprises a pressure reducing valve 7, a pressure sensor and normally closed

solenoid valves

10 and 11 which are connected in sequence, and the air inlet adjusting assembly comprises a pressure sensor and a safety valve 15. The output feedback assembly comprises a sensor and a back pressure valve 20 which are connected in sequence, and the sensor comprises a pressure sensor, a humidity sensor and a temperature sensor. A pressure sensor: pressure data in the pipeline is collected, the model MIK-P300G is obtained, and the test range is 0-0.6 bar. A temperature sensor: temperature data in the pipeline, model PT100, test range-200 ~ 200 ℃. A humidity sensor: humidity data in a pipeline is collected, the model HMM100 is adopted, the temperature range is-70-180 ℃, and the humidity range is 0-100% RH. Pressure reducing valve 7: and reducing the inlet pressure and maintaining the stable outlet pressure, wherein the model AW 20N 02BG is 0-0.8 bar. Back pressure valve 20: the gas backpressure is regulated. The gas regulator is configured as one of a dry-wet device 12 or a temperature regulator, and is connected into the test system when high and low temperature cycle impact tests are required, and is connected into the dry-wet device 12 when the dry-wet cycle impact tests are required. Fig. 6 is a schematic pipeline diagram of a testing system for providing a dry-wet cycle impact test, in which a dry-wet device 12 is configured, and when the testing system needs to provide a high-low temperature cycle impact test, only the dry-wet device 12 needs to be replaced by a temperature regulator, and the pipeline composition structure is the same as that in fig. 6.

The high-flux multi-target rapid testing device for the material bonding strength and the structure, provided by the invention, is a complete set of adhesive developed by taking an off-line testing clamp 16 as a core and a rapid evaluation system for the bonding structure of the adhesive, is used for evaluating the shearing strength of the adhesive after high and low temperature or dry and wet cycle impact, and can also be used for researching the change of the shearing resistance of different adhesive structures after a durability test. Wherein, the shape and the size of the tested piece 5 are manufactured according to the single-piece specification in GB/T7124-. The fixture 16 shown in fig. 1 can accommodate 10 tested parts 5 in total, so as to ensure the test result to be accurate (at least 5 tested parts are one group according to the requirements of GB/T7124 and 2008), and also to simultaneously test a plurality of groups of samples, thereby saving the test time. A plurality of fixed structures have been arranged in anchor clamps 16 box 1 and the inboard of apron 2 for confirm the 5 positions of measured, disperse simultaneously measured 5, make measured 5 fully expose in the test atmosphere, guarantee that gas unobstructed flow in box 1 among the test process, temperature or humidity are evenly distributed in box 1. The fixing structure is provided with sufficient clearance, and if the measured part 5 changes in the thickness direction due to the change of the structure of the adhesive in the fixing structure, the clamp 16 can still be used for clamping the measured part 5.

The cycle test system can perform high and low temperature cycle impact or dry and wet cycle tests, taking a dry and wet switching process as an example, the schematic diagram of the test system is shown in fig. 6, air is compressed and introduced into the filter, and is introduced into the humidifier through the pressure reducing valve 7; the humidifier adjusts the air to a certain temperature and humidity in a bubbling humidification mode and then introduces the air into the inlet of the clamp 16; after exiting the outlet of the fixture 16, the temperature, humidity and pressure therein are sensed and vented to the atmosphere. And data such as humidity, temperature and the like are transmitted to an electric control device of the humidifier as negative feedback information, so that the stability of the target temperature and humidity is maintained. Wherein the temperature testing range is-40 ℃ to 180 ℃, the humidity is 0-100% RH at the corresponding temperature, and the gas introducing time and the back pressure can be adjusted.

The specific process of dry-wet switching comprises the following steps: if set to target moisture humidification 100% RH; the temperature of the dry gas is 5 ℃ higher than the room temperature, and the humidity is not controlled. 1) When the air path is dry gas, the two normally closed

electromagnetic valves

10 and 11 are opened, the electromagnetic valve in the humidifier is switched to output the dry gas by inputting a set value (the humidity is 100% RH, the temperature is room temperature +5 ℃), and the temperature of the dry gas path is raised and kept for 59 s; 2) when the air path is wet, the two normally closed

solenoid valves

10 and 11 are opened, the solenoid valves switch to output the wet, and the wet reaches a set value and then continues to output for 3 s. And the durability of the adhesive is quickly evaluated by the quick cycle switching of the dry and wet gas paths.

This example illustrates a specific implementation process of a high throughput multi-objective rapid test method for material adhesion strength and structure by taking a test of the durability of the binder in PEMFC in a dry-wet alternating environment as an example. And (3) loading 10 tested pieces 5 into the clamp 16 shown in FIG. 1, wherein the sizes of the 10 tested pieces 5 are all manufactured according to the single-piece specification in GB/T7124-2008. The fixed structure in the clamp 16 dispersedly fixes the tested piece 5 in the box body 11, and is connected with the cover plate 2 by using bolts, and the box body 1 and the cover plate 2 are sealed by using sealing rings. The pipeline interface 3 on the box body 1 is connected with the pipeline of the test system, and the clamp 16 is fixed on the test table surface through the supporting foot rest 4. Taking a dry-wet switching test as an example, the gas used for the test is air, the test temperature is set to be 80 ℃, the humidity is changed back and forth between 0% RH and 80% RH, the gas backpressure is 0.5MPa, and the flow is 5 slpm. In a test system gas circuit, the normally closed

solenoid valves

10 and 11 are kept in an open state in a test process; the compressed air is decompressed by the decompression valve 7 and then the air pressure of the inlet is detected by the first pressure sensors 8 and 9; the humidifier in the humidifier 12 can humidify the gas, the electromagnetic valve controls the dry-wet gas to be switched, and the first humidity sensor 13 detects the gas humidity in the gas path; the second pressure sensor 14 detects the gas pressure after the wet-dry device 12, if the gas pressure exceeds a certain value, the safety valve 15 discharges the gas, and then the gas is introduced into the clamp 16; after the gas flows out of the jig 16, the third pressure sensor 17, the second humidity sensor 18, and the temperature sensor 19 detect the pressure, humidity, and temperature of the exhaust gas, respectively, and control the stabilization of the pressure, humidity, and temperature of the gas path as negative feedback information. The dry-wet cycle period is 3 minutes, the cycle is firstly carried out for 2000 times, and after the cycle is finished, 5 tested pieces 5 are taken down for carrying out the shear strength test; and (5) continuing to circulate 4000 times, taking off the remaining 5 tested pieces 5 after the circulation is finished, and carrying out a shear strength test. The binder strength changes in the two sets of samples were compared. The results of the test part are shown in fig. 7, where the test time is 1 hour, it can be seen that the switching time of the device is stable and the humidity can meet the setting requirement.

The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.

Claims

1. A high-flux multi-target rapid testing device for material bonding strength and structure is characterized by comprising:

a clamp (16): the device is used for clamping and packaging a plurality of tested pieces (5), and the tested pieces (5) are dispersedly packaged in a sealed space of the clamp (16);

the test system comprises: and the sealed space is communicated with the clamp (16) and is used for providing high and low temperature or dry and wet cycle impact to the tested piece (5).

2. The high-flux multi-target rapid testing device for the material bonding strength and the structure according to claim 1, wherein the clamp (16) comprises a box body (1) and a cover plate (2), the side surface of the box body (1) is open, the cover plate (2) is fixed on the opening surface of the box body (1) through a sealing ring in a sealing manner, a plurality of fixing structures used for clamping the tested piece (5) are arranged on the box body (1) and the cover plate (2), the fixed structures fix the tested piece (5) in the vertical direction, and a pipeline interface (3) used for communicating the testing system is arranged on the box body (1).

3. The high-throughput multi-target rapid testing device for the material bonding strength and the structure according to claim 2, wherein the fixing structure comprises a clamping piece (6) arranged on the side wall of the opposite side of the cover plate (2) in the box body (1), the clamping piece (6) is used for clamping and fixing four corners of the tested piece (5), the fixing structure further comprises a supporting column (21) arranged on the cover plate (2), and after the cover plate (2) is installed in place, the supporting column (21) abuts against the tested piece (5).

4. The high-flux multi-target rapid testing device for the material bonding strength and the structure according to claim 2, characterized in that the clamp (16) further comprises a supporting foot stand (4), and the box body (1) is fixed on a testing table through the supporting foot stand (4).

5. The device for high-flux multi-target rapid test of material bonding strength and structure according to claim 1, wherein the test system comprises an air source, an air inlet adjusting component, an air regulator, a safety protection component and an output feedback component, the input end of the dry-wet device is connected with the air source through the air inlet adjusting component, the output end of the dry-wet device is connected with the air inlet pipeline interface of the clamp (16) through the safety protection component, the dry-wet device is provided with a temperature sensor, and the output feedback component is connected with the exhaust pipeline interface of the clamp (16).

6. The apparatus for high throughput multi-object rapid testing of material bond strength and structure according to claim 5, wherein the gas conditioner is configured as one of a desiccator (12) or a temperature conditioner.

7. The high-flux multi-target rapid testing device for the material bonding strength and the structure according to claim 5, wherein the air inlet adjusting assembly comprises a pressure reducing valve (7), a pressure sensor and normally closed solenoid valves (10, 11) which are connected in sequence.

8. The device for high throughput multi-object rapid testing of material bond strength and structure according to claim 5, wherein the safety-comprising components comprise a pressure sensor and a safety valve (15).

9. The high-flux multi-target rapid test device for the material bonding strength and structure according to claim 1, wherein the output feedback assembly comprises a sensor and a back pressure valve (20) which are connected in sequence, and the sensor comprises a pressure sensor, a humidity sensor and a temperature sensor.

10. A method for high-throughput multi-target rapid test of material bonding strength and structure, which is based on the device of any one of claims 1 to 9, and comprises the following steps:

the tested piece (5) is dispersedly packaged in the sealed space of the clamp (16);

the test system provides high and low temperature or dry and wet cycle impact to the tested piece (5);

and taking down the tested piece (5) for shear strength test.