Constant temperature device for electrical property test

Abstract

The utility model discloses a constant temperature device for an electrical property test, which relates to the field of material test equipment and comprises a constant temperature chamber with a top opening and an interface sealing plug. The interface sealing plug is arranged at the opening of the constant-temperature chamber and is detachably connected with the constant-temperature chamber; the constant-temperature chamber and the interface sealing plug jointly form a closed cavity for accommodating a sample to be tested; the interface sealing plug is provided with at least one first cable passage, one end of the temperature measuring cable penetrates through the first cable passage to be connected with the temperature sensing element in the constant-temperature chamber, and the other end of the temperature measuring cable is connected with external temperature monitoring equipment and used for monitoring the temperature in the constant-temperature chamber in real time; the temperature measuring cable is of a coaxial double-layer insulation structure and sequentially comprises a first silver-plated copper wire main core, an inner insulation layer and an outer insulation layer from inside to outside. The constant-temperature cavity and the interface sealing plug are both of a multi-layer composite structure, and are sequentially provided with a heat-conducting metal layer and an insulating heat-insulating layer from outside to inside; the temperature fluctuation rate is low, the size is small, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to material testing device technical field, concretely relates to a constant temperature device for electrical performance test. BACKGROUND

[0002] In the field of material science, especially in the research of electronic ceramic materials, electrical performance test is a key link for evaluating material performance. At present, more and more researchers pay attention to electrical performance at different temperatures, and low temperature fluctuation rate constant temperature device is the key to obtain reliable electrical performance data.

[0003] In the related art, ordinary temperature control equipment such as high-low temperature box, oven, water bath, sand bath and the like is mostly used, or high-precision constant temperature equipment is used for material electrical performance test. However, the temperature fluctuation rate of ordinary temperature control equipment is high, generally more than ±1℃, and it is difficult to meet the high-precision test requirement. Moreover, the high-precision constant temperature equipment is not only large in size, occupies a large amount of laboratory space, and has poor adaptability, but also is high in cost, and is difficult to be widely applied in the field of scientific research.

[0004] Therefore, there is an urgent need for a temperature control device with high precision, small size and low cost. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides a constant temperature device for electrical performance test to solve the technical problem of high temperature fluctuation rate, large size and high cost in the related art.

[0006] The utility model provides a constant temperature device for electrical performance test, which comprises a constant temperature chamber with an opening at the top and an interface sealing plug, the interface sealing plug is arranged at the opening of the constant temperature chamber and detachably connected with the constant temperature chamber, and the constant temperature chamber and the interface sealing plug jointly form a closed cavity for accommodating a sample to be tested.

[0007] At least one first cable passage is arranged on the interface sealing plug, a temperature measuring cable is arranged in the first cable passage, one end of the temperature measuring cable is connected with a temperature sensing element in the constant temperature chamber through the first cable passage, and the other end is connected with an external temperature monitoring device for real-time monitoring of the temperature in the constant temperature chamber.

[0008] The temperature measuring cable adopts a coaxial double-layer insulation structure, and the first silver-plated copper wire main core, the inner insulation layer and the outer insulation layer are sequentially arranged from the axis.

[0009] The constant temperature chamber and the interface sealing plug both adopt a multilayer composite structure, and the heat-conducting metal layer and the insulation heat insulation layer are sequentially arranged from the outside to the inside.

[0010] In an alternative embodiment, at least one second cable passage is arranged on the interface sealing plug, a high-voltage cable is arranged through the second cable passage, one end of the high-voltage cable is connected with the surface of the sample to be tested through the second cable passage, and the other end is connected with an external pressure applying device for applying voltage to the sample to be tested.

[0011] The high-voltage cable adopts a coaxial double-layer shielding structure, and from the axis, the inside to the outside are sequentially arranged with a second silver-plated copper wire main core, a main insulation layer, a silver-plated copper wire shielding net and an insulation protective layer.

[0012] In an alternative embodiment, at least one gas passage is arranged on the interface sealing plug, and a needle valve is arranged in the gas passage.

[0013] In an alternative embodiment, the first cable passage, the second cable passage and the gas passage are all arranged with a plurality of, and the temperature measuring cable, the high-voltage cable and the needle valve are also arranged with a plurality of.

[0014] In an alternative embodiment, the thermostatic chamber adopts an integrated T-shaped structure, and comprises a communicating upper vertical pipe cavity and a lower cylindrical cavity, the outer diameter of the upper vertical pipe cavity is smaller than the outer diameter of the lower cylindrical cavity, and the length of the upper vertical pipe cavity is greater than the length of the lower cylindrical cavity.

[0015] In an alternative embodiment, the volume of the upper vertical pipe cavity is 0.005-0.03 L, and the volume of the lower cylindrical cavity is 0.05-0.4 L.

[0016] In an alternative embodiment, a heat-resistant elastic disc is further arranged, and a limiting structure is arranged on the inner wall of the thermostatic chamber close to the opening, and the limiting structure is used for placing the heat-resistant elastic disc.

[0017] In an alternative embodiment, dimethyl silicone oil is injected into the cavity in the thermostatic chamber, and the liquid height of the dimethyl silicone oil does not exceed the height of the upper surface of the lower cylindrical cavity.

[0018] In an alternative embodiment, a threaded structure is arranged on the inner wall of the thermostatic chamber close to the opening, and the interface sealing plug is threadedly connected with the thermostatic chamber.

[0019] In an alternative embodiment, the thickness of the heat-conducting metal layer of the thermostatic chamber is 0.5-5 mm, and the thickness of the insulation heat insulation layer of the thermostatic chamber is 1-10 mm.

[0020] The utility model has the following beneficial effects:

[0021] (1) The constant temperature device of the utility model adopts movable design, and is small, strong in adaptability and convenient to operate, and can be conveniently used in various laboratory environments.

[0022] (2) The constant temperature device of the utility model is low in cost and can be widely applied to the auxiliary test of the electrical properties of electronic ceramics, thin film materials and semiconductor devices.

[0023] (3) The constant temperature device of the utility model has low temperature fluctuation rate, high temperature stability in a wide temperature range, guarantees the reliability of test results, and can meet the strict requirements of electronic ceramic materials and the like on constant temperature environment in electrical property test. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a constant temperature device structure schematic view for electrical property test according to the utility model embodiment;

[0026] Figure 2 It is a temperature measuring cable structure schematic view according to the utility model embodiment;

[0027] Figure 3 It is a constant temperature chamber structure schematic view according to the utility model embodiment;

[0028] Figure 4 It is an interface sealing plug structure schematic view according to the utility model embodiment;

[0029] Figure 5 It is another constant temperature device structure schematic view for electrical property test according to the utility model embodiment;

[0030] Figure 6 It is a high-voltage cable structure schematic view according to the utility model embodiment;

[0031] Figure 7 It is a curve graph of sample temperature change with time in the constant temperature device according to the utility model embodiment.

[0032] Reference signs:

[0033] 1, constant temperature chamber; 101, upper vertical tube cavity; 102, lower cylindrical cavity; 103, limiting structure; 104, threaded structure; 2, interface sealing plug; 3, sample to be tested; 4, first cable passage; 5, temperature measuring cable; 501, first silver-plated copper wire main core; 502, inner insulation layer; 503, outer insulation layer; 6, temperature sensing element; 7, second cable passage; 8, high-voltage cable; 801, second silver-plated copper wire main core; 802, main insulation layer; 803, silver-plated copper wire shielding net; 804, insulation protective layer; 9, gas passage; 10, needle valve; 11, heat-resistant elastic disc. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be pointed out that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application for simplified description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements, it can be wireless connection, or it can be wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0038] Figure 1The utility model discloses a structure schematic drawing of constant temperature device for electrical property test, including the constant temperature chamber 1 of top opening and interface seal plug 2, interface seal plug 2 is located at the opening of constant temperature chamber 1, and with constant temperature chamber 1 detachable connection, constant temperature chamber 1 and interface seal plug 2 form the cavity of closed together, for accommodating the sample 3 of waiting test.

[0039] Interface seal plug 2 is provided with at least one first cable passage 4, and the temperature measuring cable 5 is arranged in the first cable passage 4, one end of the temperature measuring cable 5 is connected with the temperature sensing element 6 on the surface of the sample 3 to be tested, and the other end is connected with an external temperature monitoring device (not shown in the drawings) for real-time monitoring of the surface temperature of the sample 3 to be tested.

[0040] It should be noted that the temperature measuring cable 5 and the first cable passage 4 can be fixedly connected or detachably connected.

[0041] As shown in Figure 2 The temperature measuring cable 5 adopts a coaxial double-layer insulation structure, and from the axis center, the inside to the outside is sequentially a first silver-plated copper wire main core 501, an inner insulation layer 502 and an outer insulation layer 503.

[0042] Specifically, the internal wire of the temperature measuring cable 5 adopts a coaxial double-layer insulation structure, including a plurality of silver-plated copper wire main cores and double-layer insulation layers, which can adapt to temperature sensing elements such as thermocouples, thermistors and platinum resistors, meet different temperature measurement requirements, have high temperature measurement accuracy and fast response speed. The inner insulation layer 502 and the outer insulation layer 503 are preferably silica gel or alumina.

[0043] As shown in Figure 3 and Figure 4 The constant temperature chamber 1 and the interface seal plug 2 both adopt a multilayer composite structure, and from the outside to the inside, there are sequentially a heat-conducting metal layer and an insulation heat-insulating layer.

[0044] Specifically, the outer layer of the constant temperature chamber 1 can adopt a metal material with high heat conductivity, and preferably is red copper; the inner layer of the constant temperature chamber 1 is compounded with a heat-insulating material, and preferably is silica gel. The outer layer of the constant temperature chamber 1 in the utility model embodiment adopts a metal material with high heat conductivity, which can quickly respond to temperature changes and ensure the uniformity of the temperature inside the constant temperature chamber 1, and the inner layer adopts a heat-insulating material, which can ensure the stability of the temperature inside the constant temperature chamber 1 and reduce the temperature fluctuation rate.

[0045] In an alternative embodiment, the thickness of the heat-conducting metal layer of the constant temperature chamber 1 is 0.5-5 mm, and the thickness of the insulation heat-insulating layer of the constant temperature chamber 1 is 1-10 mm.

[0046] Similarly, the outer layer of the interface sealing plug 2 can also be made of a metal material with high thermal conductivity, preferably red copper, and the thickness is preferably 0.5-5 mm; the inner layer of the interface sealing plug 2 is filled with a heat insulation material, preferably silica gel.

[0047] In an alternative embodiment, as shown in Figure 4 and Figure 5 , at least one second cable passage 7 is arranged on the interface sealing plug 2, the high-voltage cable 8 is arranged in the second cable passage 7, one end of the high-voltage cable 8 is connected to the surface of the sample 3 to be tested through the second cable passage 7, and the other end is connected to an external pressure device (not shown in the drawings) for applying voltage to the sample 3 to be tested.

[0048] It should be noted that the high-voltage cable 8 and the second cable passage 7 can be fixedly connected or detachably connected.

[0049] As shown in Figure 6 , the high-voltage cable 8 adopts a coaxial double-layer shielding structure, and from the axis center, the inside to the outside is sequentially arranged with a second silver-plated copper wire main core 801, a main insulation layer 802, a silver-plated copper wire shielding net 803, and an insulation protection layer 804.

[0050] Specifically, the internal wire of the high-voltage cable 8 adopts a coaxial double-layer shielding structure, and the withstand voltage performance can reach 10 kV, which ensures the safety and reliability under high-voltage test conditions. Among them, the main insulation layer 802 and the insulation protection layer 804 are preferably silica gel or aluminum oxide.

[0051] In an alternative embodiment, as shown in Figure 4 and Figure 5 , at least one gas passage 9 is arranged on the interface sealing plug 2, and a needle valve 10 is arranged in the gas passage 9.

[0052] Specifically, the needle valve 10 can be used to control the vacuum degree or gas flow in the constant-temperature chamber 1, so as to realize accurate control of the gas environment in the constant-temperature chamber 1 and meet the needs of electrical performance testing under different gas atmospheres.

[0053] It should be noted that the needle valve 10 and the gas passage 9 can be fixedly connected or detachably connected.

[0054] Specifically, the combination of the first cable passage 4 and the temperature measurement cable 5 can be referred to as a temperature measurement interface, the combination of the second cable passage 7 and the high-voltage cable 8 can be referred to as a high-voltage interface, and the combination of the gas passage 9 and the needle valve 10 can be referred to as a gas path interface. The utility model can provide multifunctional electrical performance testing by additionally arranging the temperature measurement interface, the high-voltage interface, and the gas path interface, and the three can work together to ensure the accuracy, reliability, and diversity of the test.

[0055] In an alternative embodiment, a plurality of first cable passages 4, second cable passages 7 and gas passages 9 are provided, and a plurality of temperature measuring cables 5, high voltage cables 8 and needle valves 10 are also provided accordingly.

[0056] The utility model discloses through the temperature measuring interface of adding, can monitor the position of the inside multiple position of constant temperature chamber, make the monitoring result more accurate, improve the accuracy and reliability of electrical performance test, through the high pressure interface of adding, can carry out multiple high voltage electrical experiment simultaneously, need not frequently change interface or connecting equipment, improve the experiment efficiency greatly, and different experiment can need different high pressure interface configuration, add multiple high pressure interface can be selected and used according to the experiment demand flexibly, increase the flexibility and adaptability of experiment, through the gas path interface of adding, can allow the introduction of different gas in constant temperature chamber, carries out the electrical performance test of gas related, such as gas sensor test, gas reaction kinetics research etc., expands the application range of experiment.

[0057] In an alternative embodiment, as shown in Figure 3 The constant temperature chamber 1 adopts an integrated T-shaped structure, including a communicating upper vertical tube cavity 101 and a lower cylindrical cavity 102, the outer diameter of the upper vertical tube cavity 101 is smaller than that of the lower cylindrical cavity 102, and the length of the upper vertical tube cavity 101 is greater than that of the lower cylindrical cavity 102.

[0058] In an alternative embodiment, the volume of the upper vertical tube cavity 101 is 0.005-0.03 L, and the volume of the lower cylindrical cavity 102 is 0.05-0.4 L.

[0059] Specifically, the size of the upper vertical tube cavity 101 can be Φ15*80mm or any other size of a long cylinder with a volume in the range of 0.005-0.03 L, and the size of the lower cylindrical cavity 102 can be Φ70*50mm or any other size of a short cylinder with a volume in the range of 0.05-0.4 L. The overall structure of the constant temperature chamber 1 is compact and small in size, which is suitable for different general temperature control equipment such as high-low temperature boxes, ovens, water baths and sand baths, and has strong flexibility and applicability.

[0060] In an alternative embodiment, as shown in Figure 5 The device further includes a heat-resistant elastic disc 11, and the constant temperature chamber 1 is provided with a limiting structure 103 on the inner wall close to the opening, and the limiting structure 103 is used to place the heat-resistant elastic disc 11.

[0061] Specifically, the heat-resistant elastic disc 11 is placed near the opening of the constant temperature chamber 1 and is limited to a certain height on the inner wall of the upper vertical pipe cavity 101 through the limiting structure 103, so that when the interface sealing plug 2 is connected with the constant temperature chamber 1, the heat-resistant elastic disc 11 can be in interference fit with the bottom of the interface sealing plug 1, thereby guaranteeing the airtightness of the constant temperature chamber 1 and the stability of the internal temperature; and the heat-resistant elastic disc 11 is preferably made of silica gel.

[0062] It should be noted that the heat-resistant elastic disc 11 is adaptively provided with through holes corresponding to the first cable passage 4, the second cable passage 7 and the air passage 9 on the interface sealing plug 2.

[0063] In an alternative embodiment, dimethyl silicone oil is injected into the cavity in the constant temperature chamber 1, and the liquid level of the dimethyl silicone oil does not exceed the upper surface height of the lower cylindrical cavity 102. The dimethyl silicone oil injected into the cavity in the constant temperature chamber 1 can further improve the temperature uniformity in the constant temperature chamber 1 and prevent air breakdown during high-voltage performance testing.

[0064] In an alternative embodiment, the constant temperature chamber 1 is provided with a threaded structure 104 on the inner wall near the opening, and the interface sealing plug 2 is threadedly connected with the constant temperature chamber 1.

[0065] The device of the utility model is convenient to install and disassemble and easy to operate.

[0066] In summary, (1) the constant temperature device of the utility model adopts a movable design, is small in size, strong in adaptability and convenient to operate, and can be conveniently used in various laboratory environments.

[0067] (2) The constant temperature device of the utility model is low in cost and can be widely applied to the auxiliary testing of the electrical properties of electronic ceramics, thin film materials and semiconductor devices.

[0068] (3) The constant temperature device of the utility model has a low temperature fluctuation rate, has extremely high temperature stability in a wide temperature range, guarantees the reliability of the test results, and can meet the stringent requirements of electronic ceramic materials and the like on the constant temperature environment in electrical property testing.

[0069] In order to verify the technical effect of the utility model, the utility model takes the testing process of the ferroelectric ceramic electric card effect as an example for description.

[0070] The constant temperature device is placed in the oven, one end of the high-temperature resistant enameled wire is connected with the high-voltage cable in the second cable channel, the other end is directly connected on the surface silver-plated ferroelectric ceramic, the lead wire interface (namely the lead wire end outside the constant temperature chamber) of the high-voltage cable is connected with the Trek 677B high-voltage power amplifier. The sensor part of the two-wire platinum resistance surface temperature sensor is adhered on the surface of the ferroelectric ceramic through the heat-conducting silicone grease, the lead wire part is connected with the temperature measuring cable in the first cable channel, the lead wire interface (namely the lead wire end outside the constant temperature chamber) of the temperature measuring cable is connected with the Agilent 34420A nanovolt microampere meter.

[0071] During the test, the oven is set at a certain temperature, and the real-time data of the surface temperature of the ferroelectric ceramic is recorded by using the nanovolt microampere meter. After the temperature is stable, the high-voltage power amplifier generates different amplitude rectangular wave voltages, and the obtained data results are as shown in Figure 7 It can be known that the temperature baseline fluctuates very little within 30 minutes, and the temperature change of 0.024 ℃ generated by the electrocaloric effect can be obviously distinguished.

[0072] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A thermostat device for electrical performance testing, characterized by: The constant temperature chamber comprises an opening at the top and an interface sealing plug; the interface sealing plug is arranged at the opening of the constant temperature chamber and detachably connected with the constant temperature chamber; the constant temperature chamber and the interface sealing plug jointly form a closed cavity for accommodating a sample to be tested; The interface sealing plug is provided with at least one first cable passage, the first cable passage is provided with a temperature measuring cable, one end of the temperature measuring cable is connected with a temperature sensing element inside the constant temperature chamber through the first cable passage, and the other end is connected with an external temperature monitoring device for real-time monitoring of the temperature inside the constant temperature chamber to be tested. The temperature measuring cable adopts a coaxial double-layer insulation structure, and from the axis center, the temperature measuring cable is sequentially provided with a first silver-plated copper wire main core, an inner insulation layer and an outer insulation layer from inside to outside. The constant temperature chamber and the interface sealing plug both adopt a multi-layer composite structure, and from outside to inside, the constant temperature chamber and the interface sealing plug are sequentially provided with a heat-conducting metal layer and an insulation heat insulation layer.

2. The apparatus of claim 1, wherein: The interface sealing plug is provided with at least one second cable passage, the second cable passage is provided with a high-voltage cable, one end of the high-voltage cable is connected with two surfaces of the sample to be tested through the second cable passage, and the other end is connected with an external pressure applying device for applying voltage to the sample to be tested. The high-voltage cable adopts a coaxial double-layer shielding structure, and from the axis center, the high-voltage cable is sequentially provided with a second silver-plated copper wire main core, a main insulation layer, a silver-plated copper wire shielding net and an insulation protective layer from inside to outside.

3. The apparatus of claim 2, wherein: The interface sealing plug is provided with at least one gas passage, and the gas passage is provided with a needle valve.

4. The apparatus of claim 3, wherein: The first cable passage, the second cable passage and the gas passage are all provided with a plurality of temperature measuring cables, high-voltage cables and needle valves.

5. The apparatus of claim 1, wherein: The constant temperature chamber adopts an integrated T-shaped structure, comprising a communicating upper vertical pipe cavity and a lower cylindrical cavity, the outer diameter of the upper vertical pipe cavity is smaller than the outer diameter of the lower cylindrical cavity, and the length of the upper vertical pipe cavity is greater than the length of the lower cylindrical cavity.

6. The apparatus of claim 5, wherein: The volume of the upper vertical pipe cavity is 0.005-0.03 L, and the volume of the lower cylindrical cavity is 0.05-0.4 L.

7. The apparatus of claim 1, wherein: Further comprising a heat-resistant elastic disc; the constant temperature chamber is provided with a limiting structure on the inner wall close to the opening, and the limiting structure is used for placing the heat-resistant elastic disc.

8. The apparatus of claim 5, wherein: The cavity inside the constant temperature chamber is filled with dimethyl silicone oil, and the liquid height of the dimethyl silicone oil does not exceed the upper surface height of the lower cylindrical cavity.

9. The apparatus of claim 1, wherein: The constant temperature chamber is provided with a threaded structure on the inner wall close to the opening, and the interface sealing plug is threadedly connected with the constant temperature chamber.

10. The apparatus of claim 1, wherein: The thickness of the heat-conducting metal layer of the constant temperature chamber is 0.5-5 mm, and the thickness of the insulation heat insulation layer of the constant temperature chamber is 1-10 mm.

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