Piezoelectric ceramic curie temperature testing device

Abstract

The utility model discloses a piezoelectric ceramic curie temperature testing device, it belongs to piezoelectric ceramic field, and its simple structure, low in cost, and the worker can be very convenient to test when one line production, and test record mutation point in the closed environment, and the consistency of the result of repeated test is good. It mainly includes furnace body and digital bridge, is equipped with the heating pipe in the furnace body, and the heating pipe outside is wound with the heating wire, and the heating wire is connected with the voltage regulator, and the digital bridge is connected with the measured piece through the mica high temperature line, and the measured piece is located in the heating pipe, and the furnace body detects the temperature in the furnace in real time through the temperature measuring device, and is equipped with the apron on the furnace body. The utility model is mainly used for piezoelectric ceramic curie temperature testing.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric ceramics, and more specifically, to a piezoelectric ceramic Curie temperature testing device. Background Technology

[0002] Piezoelectric ceramics, as a core functional material capable of converting mechanical energy into electrical energy, occupy a pivotal position in modern technology due to their unique piezoelectric effect. From everyday electronic products to precision instruments in industrial production and advanced equipment in medical diagnosis, the applications of piezoelectric ceramics are ubiquitous, demonstrating extremely broad development prospects. Among the many parameters that determine the performance and application range of piezoelectric ceramics, the Curie temperature is undoubtedly one of the most critical. The Curie temperature, also known as the Curie point, refers to the critical temperature at which a piezoelectric ceramic transitions from the ferroelectric phase to the paraelectric phase. This temperature is not simply a physical indicator, but directly relates to the upper limit of the maximum operating temperature of the piezoelectric ceramic material. Like a ruler, it precisely guides the selection, safety control, and reliable design of piezoelectric ceramics in different environments. For example, in the aerospace field, aircraft face extreme temperature changes during high-altitude flight. The piezoelectric ceramics selected in this situation need to have a high Curie temperature to ensure stable operation in high-temperature environments, providing reliable support for the aircraft's navigation, communication, and other systems. In automotive electronics, the temperature around the engine is high, and the piezoelectric ceramics used in automotive sensors, fuel injectors, and other components must also meet corresponding Curie temperature requirements to ensure the normal operation of the vehicle. Currently, there is no simple, reliably tested, and stable piezoelectric ceramic Curie temperature testing device. Utility Model Content

[0003] The purpose of this invention is to provide a piezoelectric ceramic Curie temperature testing device, which has a simple structure, low cost, and can be easily tested by workers in the production line; and it records abrupt change points in a closed environment, with good consistency in the results of repeated tests.

[0004] This utility model is achieved through the following technical solution: A piezoelectric ceramic Curie temperature testing device includes a furnace body and a digital bridge. The furnace body is equipped with a heating tube, and an electric heating wire is wound around the outside of the heating tube. The electric heating wire is connected to a voltage regulator, which is connected to a power supply. The digital bridge is connected to the test piece through a mica high-temperature wire. The test piece is located inside the heating tube and is uniformly heated. The furnace body detects the furnace temperature in real time through a temperature measuring device. A cover plate is provided on the top of the furnace body.

[0005] Furthermore, the heating tube is an alumina ceramic tube.

[0006] Furthermore, the temperature measuring device is a thermometer, with the front temperature probe of the thermometer suspended inside the alumina ceramic tube to detect the furnace temperature in real time.

[0007] Furthermore, the test piece is a polarized piezoelectric ceramic disc, with the positive and negative poles of the piezoelectric ceramic disc short-circuited to the mica high-temperature wire, which passes through the cover plate and is connected to the digital bridge.

[0008] Compared with the prior art, the beneficial effects of this utility model are: When in use, the voltage regulator is rotated to heat the device. The capacitance value of the digital bridge increases as the temperature of the thermometer rises. When the capacitance value of the digital bridge drops sharply, the temperature of the thermometer at this time is the Curie temperature of the piezoelectric ceramic material. It has a simple structure and low cost, and workers can easily conduct tests during production. Furthermore, the abrupt change points are recorded in a closed environment, and the results of repeated tests are consistent. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] In the diagram: 1. Furnace body; 2. Heating wire; 3. Heating tube; 4. Voltage regulator; 5. Temperature measuring instrument; 6. Mica high-temperature wire; 7. Digital bridge; 8. Cover plate; 9. Component to be tested. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] like Figure 1 As shown in the embodiment, a piezoelectric ceramic Curie temperature testing device includes a furnace body 1 and a digital bridge 7. The furnace body 1 is provided with a heating tube 3, and an electric heating wire 2 is wound around the outside of the heating tube 3. The electric heating wire 2 is connected to a voltage regulator 4, and the voltage regulator 4 is connected to a power supply. The digital bridge 7 is connected to the test piece 9 through a mica high-temperature wire 6. The test piece 9 is located inside the heating tube 3 and is uniformly heated. The furnace body 1 detects the temperature inside the furnace in real time through a temperature measuring device. A cover plate 8 is provided on the top of the furnace body 1.

[0013] Specifically, the furnace body 1 is a kiln, with small holes at the bottom for the heating wire 2 to pass through. Similarly, the cover plate 8 has holes for the mica high-temperature wire 6 and temperature probe wiring. After the wiring is routed through these holes, they are sealed with a heat-resistant and low-thermal-conductivity ceramic material. The cover plate 8 is also made of a heat-resistant and low-thermal-conductivity ceramic material, and it has a certain weight. When the cover plate 8 is placed on the kiln, heat loss is negligible, resulting in good heat preservation.

[0014] The heating tube 33 is an alumina ceramic tube.

[0015] The temperature measuring device is a thermometer 5. The temperature probe at the front end of the thermometer 5 is suspended inside the alumina ceramic tube to monitor the furnace temperature in real time. The connecting wire of the temperature probe is also heat-resistant.

[0016] The test piece 9 is a polarized piezoelectric ceramic disc. The positive and negative poles of the piezoelectric ceramic disc are shorted to the mica high-temperature wire 6, respectively. The mica high-temperature wire 6 passes through the cover plate 8 and is connected to the digital bridge 7.

[0017] Specifically, the piezoelectric ceramic discs selected are standard polarized piezoelectric ceramic discs with a specification of Ø20×2.

[0018] Before the Curie temperature, piezoelectric ceramics are in the ferroelectric phase and contain spontaneously polarized "domains". When the temperature increases, the domain walls inside the ceramic move more actively, the polarization response is enhanced, and thus the dielectric constant increases. When the temperature exceeds the Curie temperature, the material turns into the paraelectric phase, the spontaneous polarization disappears, the domain structure collapses, and the dielectric constant drops significantly. The Curie temperature of piezoelectric ceramics can be found by measuring the changes in the values.

[0019] After polarizing the piezoelectric ceramic standard disc, its positive and negative terminals are shorted to the mica high-temperature wire 6, respectively. The other end of the mica high-temperature wire 6 is connected to the digital bridge 7. The piezoelectric ceramic standard disc and the front probe of the thermometer 5 are suspended and placed inside the alumina ceramic tube. The cover plate 8 is then placed on top. The voltage regulator 4 is rotated to start heating the heating wire 2. At the same time, the temperature of the thermometer 5 and the capacitance value of the digital bridge 7 are observed to change. The capacitance value of the digital bridge 7 will increase as the temperature of the thermometer 5 rises. When the capacitance value of the digital bridge 7 drops sharply, the temperature of the thermometer 5 at this time is the Curie temperature of the piezoelectric ceramic material. After the test, wait for the temperature to drop to room temperature and then remove the piezoelectric ceramic standard disc.

Claims

1. A piezoelectric ceramic Curie temperature testing device, comprising a furnace body (1) and a digital bridge (7), characterized in that: The furnace body (1) is equipped with a heating tube (3), and an electric heating wire (2) is wound around the outside of the heating tube (3). The electric heating wire (2) is connected to the voltage regulator (4). The digital bridge (7) is connected to the test piece (9) through the mica high temperature wire (6). The test piece (9) is located inside the heating tube (3). The furnace body (1) detects the furnace temperature in real time through a temperature measuring device. A cover plate (8) is provided on the top of the furnace body (1).

2. The piezoelectric ceramic Curie temperature testing device according to claim 1, characterized in that: The heating tube (3) is an alumina ceramic tube.

3. The piezoelectric ceramic Curie temperature testing device according to claim 2, characterized in that: The temperature measuring device is a thermometer (5), and the front temperature probe of the thermometer (5) is suspended in the alumina ceramic tube.

4. The piezoelectric ceramic Curie temperature testing device according to claim 1, characterized in that: The test piece (9) is a polarized piezoelectric ceramic disc. The positive and negative poles of the piezoelectric ceramic disc are short-circuited with the mica high-temperature wire (6) respectively. The mica high-temperature wire (6) passes through the cover plate (8) and is connected to the digital bridge (7).

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