CN108088867B - Method for testing shape memory performance of surface microstructure - Google Patents
Method for testing shape memory performance of surface microstructure Download PDFInfo
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- CN108088867B CN108088867B CN201711246321.XA CN201711246321A CN108088867B CN 108088867 B CN108088867 B CN 108088867B CN 201711246321 A CN201711246321 A CN 201711246321A CN 108088867 B CN108088867 B CN 108088867B
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- 238000012360 testing method Methods 0.000 title claims abstract description 75
- 230000007334 memory performance Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 16
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- 239000000463 material Substances 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 229920000642 polymer Polymers 0.000 claims abstract description 64
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 239000000112 cooling gas Substances 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 11
- 238000010998 test method Methods 0.000 claims description 11
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- 238000003825 pressing Methods 0.000 claims description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Natural products CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims 2
- 229920001577 copolymer Polymers 0.000 claims 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 claims 1
- 230000005674 electromagnetic induction Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000009530 blood pressure measurement Methods 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
Abstract
According to the method for testing the shape memory performance of the surface microstructure, the objective table, the upper flat rod, the guide rail and the electromagnetic heating assembly are organically fused, the electromagnetic heating assembly generates an alternating magnetic field to heat the high-molecular magnetic nanocomposite material, the upper flat rod applies pressure to the high-molecular magnetic nanocomposite material, and the measurement equipment compares data before and after testing, so that the shape memory performance test of the surface microstructure of the high-molecular magnetic nanocomposite material can be completed. The method for testing the shape memory performance of the surface microstructure can test the shape memory performance of the surface microstructure of the polymer magnetic nano composite material, can study the relation between pressure and the deformation quantity of the microstructure, study the relation between electromagnetic induction heating time and the shape recovery rate of the microstructure, and carry out integrated study on the processes of electromagnetic induction heating, pressure application, pressure measurement, abrasion, shape recovery and the like of the surface microstructure.
Description
Technical Field
The invention relates to the technical field of testing of shape memory performance of a surface microstructure of a polymer magnetic nano composite material, in particular to a method for testing the shape memory performance of the surface microstructure.
Background
The polymer magnetic nano composite material is a magnetic body prepared by mixing, bonding, filling and compounding, surface compounding, laminating and compounding a polymer material and various inorganic magnetic substances, and has a good practical application value and a wide prospect at present. The shape memory property refers to the phenomenon that after a solid material with a certain shape is subjected to certain plastic deformation under certain conditions and is heated to a certain temperature, the material is completely restored to the shape before deformation. The micro-structure formed on the surface of the shape memory material can deform in an external proper temperature environment and fix the shape at low temperature, and the wettability, the optical property and the like of the surface of the material are changed along with the deformation.
However, the existing device for testing the memory property of the polymer magnetic nanocomposite material can only test the macroscopic shape memory property of the material, but cannot test the shape memory property of the microstructure.
Therefore, it is an urgent need to solve the problem of the art to provide a testing apparatus capable of testing the shape memory performance of the surface microstructure of the polymer magnetic nanocomposite.
Disclosure of Invention
The invention provides a device and a method for testing the shape memory performance of a surface microstructure, which can test the shape memory performance of the surface microstructure of a high-molecular magnetic nano composite material.
In order to solve the above technical problem, the present invention provides a device for testing shape memory performance of a surface microstructure, comprising:
an outer casing for providing an internal test space;
the object stage is arranged in the outer box body and used for placing the polymer magnetic nano composite material;
the device comprises a guide rail arranged above an objective table, an upper flat rod connected with the guide rail and used for applying pressure to the polymer magnetic nano composite material, and a pressure sensor arranged on the upper flat rod;
the electromagnetic heating component is arranged on the lower surface of the objective table and is used for electromagnetically heating the macromolecular magnetic nano composite material;
the temperature sensor is arranged on the electromagnetic heating assembly;
the cooling gas nozzle is used for spraying cooling gas to the polymer magnetic nano composite material, and the gas cylinder is communicated with the cooling gas nozzle.
Preferably, in the above testing apparatus, the stage includes a sample fixing position for placing the polymer magnetic nanocomposite, and a latch disposed at an edge of the sample fixing position and used for clamping the polymer magnetic nanocomposite.
Preferably, in the testing apparatus, the electromagnetic heating assembly includes an electromagnetic coil, an insulating layer sleeved outside the electromagnetic coil, and a shielding layer sleeved outside the insulating layer.
Preferably, in the above test apparatus, an exhaust fan disposed in the outer box body is further included.
Preferably, in the above test apparatus, the gas in the gas cylinder is supercritical carbon dioxide or compressed air.
Preferably, in the testing apparatus, the polymer magnetic nanocomposite is a thermoplastic polyurethane/ferroferric oxide composite or an ethylene-ethyl acrylate copolymer/ferroferric oxide composite.
Preferably, in the above test apparatus, further comprising:
the rotary table is arranged below the objective table and used for driving the objective table to rotate;
and the servo motor drives the rotary table to rotate.
The invention also provides a test method of the shape memory performance of the surface microstructure, which applies the test device and comprises the following steps:
step 1) measuring the height h1 of the surface microstructure of the macromolecular magnetic nano composite material through a super-depth-of-field microscope, and placing the macromolecular magnetic nano composite material on the objective table;
step 2) electrifying the electromagnetic heating assembly, and powering off the electromagnetic heating assembly when the temperature of the polymer magnetic nano composite material reaches a preset temperature value;
step 3) the upper flat rod descends to be in contact with the polymer magnetic nanocomposite, and when the pressure in the testing device reaches a preset pressure value, the upper flat rod stops descending;
step 4), opening the gas cylinder, spraying cooling gas by the cooling gas nozzle, and cooling and shaping the polymer magnetic nano composite material; the upper flat rod rises, and the macromolecular magnetic nano composite material is taken out;
step 5) measuring the height h2 of the surface microstructure of the macromolecular magnetic nano composite material by using a super-depth-of-field microscope;
and 6) researching the relation between the pressure and the deformation quantity of the surface microstructure of the polymer magnetic nano composite material by comparing the data of the height h1, the height h2 and a preset pressure value.
The invention also provides a test method of the shape memory performance of the surface microstructure, which applies the test device and comprises the following steps:
step 1) measuring the height h3 of the surface microstructure of the macromolecular magnetic nano composite material through a super-depth-of-field microscope, and placing the macromolecular magnetic nano composite material on the objective table;
step 2) electrifying the electromagnetic heating assembly, setting the heating time of the polymer magnetic nano composite material to be a preset heating time according to a preset step temperature, powering off the electromagnetic heating assembly, simultaneously opening the gas cylinder, spraying cooling gas by the cooling gas nozzle, and cooling and shaping the polymer magnetic nano composite material;
step 3) measuring the height h4 of the surface microstructure of the macromolecular magnetic nano composite material by using a super-depth-of-field microscope;
and 4) researching the relationship between the heating time and the shape recovery rate of the surface microstructure of the polymer magnetic nanocomposite through comparison of the height h3, the height h4 and data of preset heating time.
The invention also provides a test method of the shape memory performance of the surface microstructure, which applies the test device and comprises the following steps:
step 1) measuring a contact angle theta 1 of a surface microstructure of the macromolecular magnetic nanocomposite through a contact angle measuring instrument, and placing the macromolecular magnetic nanocomposite on the objective table;
step 2) electrifying the electromagnetic heating assembly, and powering off the electromagnetic heating assembly when the temperature of the polymer magnetic nano composite material reaches a preset temperature value;
step 3) the upper flat rod descends to be in contact with the polymer magnetic nanocomposite, and when the pressure in the testing device reaches a preset pressure value, the upper flat rod stops descending;
step 4) driving the rotary table to rotate for a preset number of turns by the servo motor, opening the gas cylinder, spraying cooling gas by the cooling gas nozzle, and cooling and shaping the polymer magnetic nano composite material; the upper flat rod rises, and the macromolecular magnetic nano composite material is taken out;
step 5), measuring a contact angle theta 2 of the surface microstructure of the macromolecular magnetic nano composite material by using a contact angle measuring instrument;
and 6) researching the relationship between the number of turns of rotation and the durability of the surface microstructure of the polymer magnetic nanocomposite material by comparing the contact angle theta 1, the contact angle theta 2, the number of turns and data of a preset pressure value.
According to the device for testing the shape memory performance of the surface microstructure, provided by the invention, the objective table, the upper flat rod, the guide rail and the electromagnetic heating assembly are organically fused, an alternating magnetic field generated by the electromagnetic heating assembly is used for heating the high-molecular magnetic nanocomposite, the upper flat rod is used for applying pressure to the high-molecular magnetic nanocomposite, and data before and after testing are compared through the measuring equipment, so that the shape memory performance test of the surface microstructure of the high-molecular magnetic nanocomposite can be completed.
The method for testing the shape memory performance of the surface microstructure can test the shape memory performance of the surface microstructure of the polymer magnetic nano composite material, and can research the relation between pressure and the deformation quantity of the microstructure, the relation between electromagnetic induction heating time and the shape recovery rate of the microstructure and the integration of the processes of electromagnetic induction heating, pressure application, pressure measurement, abrasion, shape recovery and the like of the surface microstructure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a testing apparatus provided in the present embodiment;
FIG. 2 is a schematic structural diagram of an electromagnetic induction heating assembly according to the present embodiment;
FIG. 3 is a schematic view of the structure of the objective table in the present embodiment;
fig. 4 is a schematic structural diagram of the turntable in the present scheme.
In the figure: 1. the automatic detection device comprises an outer box body, a rotary table, a notch 21, an electromagnetic heating assembly 3, a shielding layer 31, an insulating layer 32, an electromagnetic coil 33, a wiring hole 4, a wiring hole insulating layer 5, an objective table 6, a lock catch 61, a sample fixing position 62, a guide rail 7, a pressure sensor 8, an exhaust fan 9, an upper flat rod 10, a cooling air nozzle 12, an air guide pipe 13 and an air bottle 14.
Detailed Description
The invention provides a device and a method for testing the shape memory performance of a surface microstructure, which can test the shape memory performance of the surface microstructure of a high-molecular magnetic nano composite material.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the present disclosure provides an apparatus for testing shape memory performance of a surface microstructure, which includes an outer case 1, a stage 6, an upper flat bar 10, a guide rail 7, an electromagnetic heating assembly 3, a cooling air nozzle 12, an air bottle 14, a pressure sensor, and a temperature sensor.
The outer casing 1 is used to provide an internal testing space, and divides the environment into the outside and the inside of the device. The object stage 6 is arranged in the outer box body 1 and used for placing the polymer magnetic nano composite material. The guide rail 7 is provided above the stage 6. The upper flat bar 10 is connected to the guide rail 7 and is used for pressing the polymer magnetic nanocomposite. The pressure sensor is arranged on the upper flat bar 10. The electromagnetic heating component 3 is arranged on the lower surface of the objective table 6 and used for electromagnetically heating the polymer magnetic nano composite material. The temperature sensor is arranged on the electromagnetic heating component 3. The gas cylinder 14 is used for storing cooling gas with a certain pressure, and is communicated with the cooling gas nozzle 12, and the cooling gas nozzle 12 sprays the cooling gas in the gas cylinder 14 to the polymer magnetic nanocomposite material for cooling the polymer magnetic nanocomposite material.
According to the device for testing the shape memory performance of the surface microstructure, provided by the invention, the objective table, the upper flat rod, the guide rail and the electromagnetic heating assembly are organically fused, an alternating magnetic field generated by the electromagnetic heating assembly is used for heating the high-molecular magnetic nanocomposite, the upper flat rod is used for applying pressure to the high-molecular magnetic nanocomposite, and data before and after testing are compared through the measuring equipment, so that the shape memory performance test of the surface microstructure of the high-molecular magnetic nanocomposite can be completed.
The stage 6 includes a sample fixing position 62 for placing the polymer magnetic nanocomposite material, and a latch 61 disposed at an edge of the sample fixing position 62 and used for clamping the polymer magnetic nanocomposite material. The lock 61 is used for locking the sample and preventing the sample from being displaced in the friction process and the pressurization process.
The electromagnetic heating component 3 is adopted to heat the polymer magnetic nano composite material, the processing process is stable and reliable, the operation is convenient, the electric heating energy conversion efficiency is high, the heating speed is high, and the heat distribution is uniform. Specifically, the electromagnetic heating element 3 includes an electromagnetic coil 33, an insulating layer 32 covering the electromagnetic coil 33, and a shielding layer 31 covering the insulating layer 32. The shielding layer 31 is intended to prevent the magnetic flux leakage phenomenon, thereby avoiding heating of the non-heating component and achieving the full utilization of electromagnetism. The purpose of the insulating layer 32 is to prevent electrical leakage from injuring a person. The electromagnetic heating component is pollution-free, environment-friendly, high in heating speed and good in heating effect.
Electromagnetic heating subassembly 3 is still including the wiring hole 4 of connecting solenoid 33, and wiring hole skin parcel has wiring hole insulating layer, prevents that the electric leakage from hindering the people.
Preferably, the scheme further comprises an exhaust fan 9 arranged in the outer box body 1, and the exhaust fan exhausts the ejected cooling gas out of the outer box body to the external environment.
The gas in the cylinder 14 is supercritical carbon dioxide or compressed air.
The polymer magnetic nano composite material is a thermoplastic polyurethane/ferroferric oxide composite material or an ethylene-ethyl acrylate copolymer/ferroferric oxide composite material.
This scheme still includes revolving stage 2 and servo motor, and revolving stage 2 sets up in objective table 6 below for it is rotatory to drive objective table 6. The servo motor drives the turntable 2 to rotate.
In one embodiment, as shown in fig. 3 and 4, the turntable 2 is provided with a groove which can prevent the object stage 6, and the groove is provided with a wiring hole 4 through which the power line is connected to an external ac power supply. The edge of objective table 6 is provided with rings, conveniently takes. Correspondingly, a notch 21 is arranged at the position corresponding to the position of the hanging ring of the object stage 6 on the turntable 2, and the notch 21 is used for being clamped into the hanging ring to play a role in positioning the object stage 6.
The scheme also provides a test method of the shape memory performance of the surface microstructure, the test method is applied to the test device and comprises the following steps:
step 1, measuring the height h1 of the surface microstructure of the polymer magnetic nano composite material by using a super field depth microscope, and placing the polymer magnetic nano composite material on an objective table 6;
step 2, the electromagnetic heating component 3 is powered on, and when the temperature of the polymer magnetic nano composite material reaches a preset temperature value, the electromagnetic heating component 3 is powered off;
step 3, the upper flat rod 10 descends to be in contact with the polymer magnetic nano composite material, and when the pressure in the testing device reaches a preset pressure value, the upper flat rod 10 stops descending;
step 5, measuring the height h2 of the surface microstructure of the polymer magnetic nano composite material by using a super-depth-of-field microscope;
and 6, researching the relation between the pressure and the deformation quantity of the surface microstructure of the polymer magnetic nano composite material by comparing the data of the height h1, the height h2 and a preset pressure value.
The scheme also provides a test method of the shape memory performance of the surface microstructure, the test method is applied to the test device and comprises the following steps:
step 1, measuring the height h3 of the surface microstructure of the polymer magnetic nano composite material by using a super field depth microscope, and placing the polymer magnetic nano composite material on an objective table 6;
step 2, the electromagnetic heating component 3 is powered on, the polymer magnetic nano composite material is heated to a preset heating time length according to a preset step temperature, the electromagnetic heating component 3 is powered off, meanwhile, the gas cylinder 14 is started, the cooling gas nozzle 12 sprays cooling gas, and the polymer magnetic nano composite material is cooled and shaped;
step 3, measuring the height h4 of the surface microstructure of the polymer magnetic nano composite material by using a super-depth-of-field microscope;
and 4, researching the relation between the heating time and the shape recovery rate of the surface microstructure of the polymer magnetic nano composite material by comparing the height h3, the height h4 and the data of the preset heating time.
The scheme also provides a test method for the shape memory performance of the surface microstructure, which applies the test device and comprises the following steps:
step 1, measuring a contact angle theta 1 of a surface microstructure of the macromolecular magnetic nanocomposite through a contact angle measuring instrument, and placing the macromolecular magnetic nanocomposite on an objective table 6;
step 2, the electromagnetic heating component 3 is powered on, and when the temperature of the polymer magnetic nano composite material reaches a preset temperature value, the electromagnetic heating component 3 is powered off;
step 3, the upper flat rod 10 descends to be in contact with the polymer magnetic nano composite material, and when the pressure in the testing device reaches a preset pressure value, the upper flat rod 10 stops descending;
step 5, measuring a contact angle theta 2 of the surface microstructure of the macromolecular magnetic nano composite material by using a contact angle measuring instrument;
and 6, researching the relation between the number of turns of rotation and the durability of the surface microstructure of the polymer magnetic nano composite material by comparing the contact angle theta 1, the contact angle theta 2, the number of turns and data of a preset pressure value.
Specifically, the invention provides the following technical scheme:
the first embodiment is as follows:
the polymer magnetic nano composite material adopts thermoplastic polyurethane/ferroferric oxide composite material as a test sample. Before testing, the height h1 of the microstructure of the sample surface was observed by an ultradepth-of-field microscope. An electromagnetic induction coil 33 in the box body generates a magnetic field after being introduced with 100MHz alternating current, magnetic ferroferric oxide nano particles in a sample cut magnetic lines to generate heat, when the preset temperature value of the sample is increased to 150 ℃, the heating is stopped, the upper flat rod 10 starts to slowly descend along the guide rails 7 at two sides under the control of signals until the upper flat rod is contacted with the sample, and the upper flat rod 10 stops descending when the pressure reaches the preset pressure value by observing the data fed back by the pressure sensor 8; and opening a valve of the supercritical carbon dioxide gas cylinder 14, and rapidly cooling and shaping the test sample by supercritical carbon dioxide which is sprayed out from the cooling gas nozzle 12 and has the temperature of 4 ℃ and the pressure of 3.87 MPa. At the same time, the exhaust fan 9 is turned on to exhaust the gas. After the sample is fully cooled and shaped, the upper flat rod 10 begins to rise, the sample is taken out, the height h2 of the microstructure on the surface of the test sample is observed by the test sample with the fixed shape under a super-depth-of-field microscope, and the relation between the pressure and the deformation amount of the microstructure is researched through data processing before and after the test sample is taken. And then the sample is put back to the testing device for electromagnetic induction heating, at the moment, the heating is stopped when the set heating time is reached by setting the step temperature with the preset heating time duration of 1-2 minutes, and simultaneously, the valve of the cooling device is opened, and the testing sample is rapidly cooled and shaped by supercritical carbon dioxide which is sprayed out from the cooling air nozzle 12 and has the temperature of 4 ℃ and the pressure of 3.87 MPa. And taking out the shaped test sample, observing the height of the microstructure on the surface of the test sample under a super-depth-of-field microscope, and researching the relationship between the heating time and the shape recovery rate of the microstructure through data processing before and after.
Example two:
in the embodiment, the polymer magnetic nanocomposite material adopts an ethylene-ethyl acrylate copolymer/ferroferric oxide sample as a test sample. Before the test, the contact angle of the sample surface was measured at room temperature using a contact angle measuring instrument. An electromagnetic induction coil 33 in the box body generates a magnetic field after 100MHz alternating current is introduced, magnetic ferroferric oxide nano particles in a sample cut magnetic lines of force to generate heat, when the temperature of the sample rises to 68 ℃, heating is stopped, through signal control, an upper flat rod 10 starts to slowly descend along a guide rail 7 until the sample is contacted with a thermoplastic polyurethane sample, through observing data fed back by a pressure sensor 8, when the pressure reaches a preset pressure value, the upper flat rod 10 stops descending, at the moment, a rotary table 2 is driven to rotate by a servo motor, an objective table 7 starts to rotate under the drive of the rotary table 2 and the upper flat rod 10 is fixed, after the objective table 7 rotates for a set number of turns, a valve of a supercritical carbon dioxide gas cylinder 14 is opened, and the test sample is rapidly cooled and shaped through supercritical carbon dioxide which is sprayed by a cooling gas nozzle 12 and has the temperature of 4 ℃ and the pressure of. And (3) testing the worn contact angle by using a contact angle measuring instrument at room temperature, and researching the durability of the ethylene-ethyl acrylate copolymer/ferroferric oxide sample by processing the data before and after the wear.
The scheme has the advantages that:
(1) the testing device and the testing method provided by the scheme can be used for testing the shape memory performance of the surface microstructure of the polymer magnetic nano composite material.
(2) The testing device and the testing method provided by the scheme can be used for researching the relation between the pressure and the deformation quantity of the microstructure.
(3) The testing device and the testing method provided by the scheme can be used for researching the relation between the electromagnetic induction heating time and the shape recovery rate of the microstructure.
(4) The testing device and the testing method provided by the scheme can be used for researching integration of processes of electromagnetic induction heating, pressure application, pressure measurement, abrasion, shape recovery and the like of the surface microstructure.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A method for testing the shape memory performance of a surface microstructure is characterized in that a testing device of the shape memory performance of the surface microstructure is applied, and the testing device of the shape memory performance of the surface microstructure comprises an outer box body (1) for providing an inner testing space; the object stage (6) is arranged in the outer box body (1) and is used for placing the polymer magnetic nano composite material; the device comprises a guide rail (7) arranged above the objective table (6), an upper flat rod (10) connected with the guide rail (7) and used for applying pressure to the polymer magnetic nano composite material, and a pressure sensor (8) arranged on the upper flat rod (10); the electromagnetic heating component (3) is arranged on the lower surface of the objective table (6) and is used for electromagnetically heating the polymer magnetic nano composite material; a temperature sensor arranged on the electromagnetic heating component (3); the cooling gas nozzle (12) is used for spraying cooling gas to the polymer magnetic nano composite material, and the gas cylinder (14) is communicated with the cooling gas nozzle (12);
the test method comprises the following steps:
step 1) measuring the height h3 of the surface microstructure of the polymer magnetic nano composite material through a super field depth microscope, and placing the polymer magnetic nano composite material on the objective table (6);
step 2), the electromagnetic heating component (3) is powered on, when the polymer magnetic nano composite material is heated to a preset heating time length according to a preset step temperature, the electromagnetic heating component (3) is powered off, the gas cylinder (14) is opened, the cooling gas nozzle (12) sprays cooling gas, and the polymer magnetic nano composite material is cooled and shaped;
step 3) measuring the height h4 of the surface microstructure of the macromolecular magnetic nano composite material by using a super-depth-of-field microscope;
and 4) researching the relationship between the heating time and the shape recovery rate of the surface microstructure of the polymer magnetic nanocomposite through comparison of the height h3, the height h4 and data of preset heating time.
2. The testing method according to claim 1, wherein the stage (6) comprises a sample holding position (62) for placing the polymer magnetic nanocomposite material, and a latch (61) disposed at an edge of the sample holding position (62) for holding the polymer magnetic nanocomposite material.
3. The testing method according to claim 1, wherein the electromagnetic heating element (3) comprises an electromagnetic coil (33), an insulating layer (32) sleeved outside the electromagnetic coil (33), and a shielding layer (31) sleeved outside the insulating layer (32).
4. The test method according to claim 1, further comprising a suction fan (9) disposed within the outer housing (1).
5. Testing method according to claim 1, characterized in that the gas inside the cylinder (14) is supercritical carbon dioxide or compressed air.
6. The testing method according to claim 1, wherein the polymer magnetic nanocomposite is a thermoplastic polyurethane/ferroferric oxide composite or an ethylene-acrylic acid ethyl acetate copolymer/ferroferric oxide composite.
7. The test method of any one of claims 1-6, further comprising:
the rotary table (2) is arranged below the objective table (6) and used for driving the objective table (6) to rotate;
and the servo motor drives the rotary table (2) to rotate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711246321.XA CN108088867B (en) | 2017-12-01 | 2017-12-01 | Method for testing shape memory performance of surface microstructure |
| CN202011239784.5A CN112461882B (en) | 2017-12-01 | 2017-12-01 | Method for testing shape memory performance of surface microstructure |
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| CN201711246321.XA CN108088867B (en) | 2017-12-01 | 2017-12-01 | Method for testing shape memory performance of surface microstructure |
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| CN108088867A CN108088867A (en) | 2018-05-29 |
| CN108088867B true CN108088867B (en) | 2021-01-26 |
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| CN112461882A (en) | 2021-03-09 |
| CN112461882B (en) | 2023-12-29 |
| CN108088867A (en) | 2018-05-29 |
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