CN203881849U - System for measuring surface resistivity of material under high-temperature condition - Google Patents

Abstract

The utility model discloses a material surface resistivity test system under high temperature conditions, which is composed of a positioning and transmission system and a resistance test system. The high-temperature environment is realized by a high-temperature heating furnace. The infrared thermometer is used to monitor the temperature change of the material surface, and the high-temperature-resistant test electrode is designed according to the two-electrode method. The high-temperature electrode adopts a high-temperature resistant graphite electrode, and the high-temperature transmission line adopts a graphite wire. During the test, the test material is first heated to a certain temperature in a high-temperature furnace, and then the material is quickly taken out, placed on a high-temperature insulating base, and the surface resistivity of the material under high-temperature conditions is continuously monitored during the natural cooling process. The utility model has a simple overall structure and is convenient in operation and control. After the material is heated, the surface resistivity of the material is tested outside the high-temperature furnace. The high-temperature-resistant graphite electrode is in contact with the high-temperature material. At the same time, the graphite wire is connected to the test instrument to avoid the impact of high temperature on the test system and ensure the operability of the measurement. sex.

Description

A material surface resistivity test system under high temperature conditions

technical field

The utility model relates to a test system for the surface resistivity of materials under high temperature conditions, in particular to the surface resistivity of aircraft surface heat insulation materials under high temperature environments.

Background technique

When the aircraft is flying in the air, the electrostatic discharge due to various reasons may cause the fuel tank to catch fire and explode. The radiation generated by the electrostatic discharge will also interfere with the communication and navigation system of the aircraft. This requires the surface material of the aircraft to have certain anti-static properties. performance. At the same time, during the high-speed movement of the aircraft in the air, high heat will be generated due to friction with the atmosphere, especially in the environment near space, the surface temperature of the aircraft can reach thousands of degrees, so the surface of the aircraft will be covered with a heat insulation layer. For the antistatic performance of the heat insulation layer, especially whether the antistatic performance under high temperature conditions is up to standard, this requires an important parameter to measure, that is, the surface resistivity of the material. However, the surface resistivity of materials will change with the change of temperature, so it is particularly important to measure the surface resistivity of materials and the surface resistivity of materials under high temperature conditions.

At present, there are three-electrode method, two-electrode method and other test methods for testing the surface resistivity of materials at normal temperature. However, due to the limitations of the heating conditions and the testing instrument itself, there is no good testing method for testing the surface resistivity of materials under high temperature conditions.

Utility model content

The technical problem to be solved by the utility model is to provide a material surface resistivity testing system under high temperature conditions with simple structure, practical operation and accurate measurement results.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a material surface resistivity test system under high temperature conditions, the key technology of which is: including positioning and transmission system and resistance test system;

The positioning and transmission system includes an insulating base, a test sample is placed on the insulating base, two high-temperature electrodes are arranged above the test sample, and a weight is arranged on each high-temperature electrode;

The resistance testing system includes a static resistance tester, and the high-temperature electrode is connected to a conversion joint of the static resistance tester through a high-temperature transmission line.

Preferably, the high-temperature electrode is a graphite electrode, and its shape is elongated.

Further preferably, the length of the electrode is 12 cm, and the height and width are both 1 cm.

Preferably, the insulating base is composed of high-temperature bricks and polytetrafluoroethylene plates for increasing insulation performance, the polytetrafluoroethylene plates are arranged below, the high-temperature bricks are arranged on the top of the polytetrafluoroethylene plates, and the Two high-temperature bricks are arranged with a certain distance between them; the test sample is located on the high-temperature bricks.

Preferably, the weight is a steel cylinder, and a groove with the same size as the high-temperature electrode is arranged on the cylinder, and the high-temperature electrode is stuck in the groove.

Preferably, the high-temperature transmission line is a graphite line.

Also included is an infrared thermometer for measuring the temperature of the test sample and/or a high temperature furnace for heating the test sample.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

1. The overall structure of the utility model is simple, and the operation and control are convenient. After the material is heated, the surface resistivity of the material is tested outside the high-temperature furnace, and the high-temperature-resistant graphite electrode is in contact with the high-temperature material. At the same time, the graphite wire is connected to the test instrument to avoid the impact of high temperature on the test system and ensure the operability of the measurement. sex.

2. The utility model uses an infrared thermometer to monitor the surface temperature of the material, and at the same time uses a heavy hammer to press the electrode to increase the contact between the electrode and the material, ensuring the accuracy of the measurement result.

3. The utility model can be flexibly used for testing the surface resistivity of various insulating materials under high temperature conditions.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Referring to accompanying drawing 1, the utility model is made up of positioning and transmission system and normal temperature resistance test system. The instruments such as the high-temperature furnace, the infrared thermometer and the electrostatic resistance tester involved in the utility model all adopt existing commercially available products. Among them, the resistance test system consists of a conversion joint and an ACL800 surface resistance tester.

The heating temperature of the high-temperature furnace can reach 1000°C; the high-temperature transmission line is made of graphite wire with a length of 1m to ensure that the high temperature is not transmitted to the test instrument; the high-temperature electrode is made of graphite material and is made into a long strip with a length of 12cm and a height and width of 1cm; the pressing weight is made of steel into a cylinder with a diameter of 10cm and a height of 10cm. A groove of the same size as the electrode is dug out at the bottom, so that the electrode is just stuck in the groove; the insulating base is made of high-temperature bricks and polytetrafluoroethylene Two high-temperature bricks are placed on the Teflon board, and a certain distance is kept between the two high-temperature bricks, but the material can be placed on the bricks, so as to ensure the resistance of the insulating base in contact with the material to be tested. High temperature performance and its high insulation performance; the conversion joint is used to connect the high temperature transmission line and the electrostatic resistance testing instrument to ensure convenient testing.

During the test, heat the material to be tested in a high-temperature furnace for half an hour to ensure that the material is fully heated and heated to the specified temperature; then quickly take out the material and place it on the high-temperature brick on the insulating base that has been placed in advance; place the graphite electrode on the On the edge of the insulating material, use a heavy hammer to press the graphite electrode, the groove clamps the electrode, the graphite transmission line connects the test electrode and connects to the surface resistance tester through the conversion joint; at the same time, the infrared thermometer is used to monitor the temperature of the material surface, and the The surface resistivity of the material under different temperature conditions is continuously monitored during natural cooling.

The utility model realizes the test of material surface resistivity under high temperature conditions, uses a high-temperature heating furnace to heat the material to a specified temperature, uses an infrared thermometer to monitor the temperature change of the material surface, and designs a high-temperature-resistant graphite test electrode according to the two-electrode method , use a heavy hammer with a groove to make the electrode fully contact with the surface of the material, the bottom of the weight is provided with a groove, the size of the groove is consistent with the size of the electrode, so that the electrode is just stuck in the groove. A graphite wire is used as the high temperature transmission line. During the test, first heat the test material to a certain temperature in a high-temperature furnace, then quickly take out the material, place it on a high-temperature-resistant insulating base, and continuously monitor the surface resistivity of the material under high-temperature conditions during its natural cooling process. The surface temperature of the material is monitored with an infrared thermometer.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. a material surface resistivity test macro under hot conditions, is characterized in that: comprise location and transmission system and resistance test system;

Described location and transmission system comprise insulator foot, are placed with test sample on described insulator foot, and described test sample top is provided with two high temperature electrodes, above each high temperature electrode, is provided with weight;

Described resistance test system comprises static resistance meter, and described high temperature electrode connects the X-over of static resistance meter through high temperature transmission line.

2. material surface resistivity test macro under hot conditions according to claim 1, is characterized in that: described high temperature electrode is graphite electrode, and it is shaped as strip.

3. material surface resistivity test macro under hot conditions according to claim 2, is characterized in that: described electrode length is 12cm, and height and width are 1cm.

4. material surface resistivity test macro under hot conditions according to claim 1, it is characterized in that: described insulator foot forms by high temperature brick with for increasing the polyfluortetraethylene plate of insulating property, described polyfluortetraethylene plate is arranged at below, described high temperature brick is located at above polyfluortetraethylene plate, and described high temperature brick arranges between two and two separated by a distance; Described test specimens product are positioned on high temperature brick.

5. material surface resistivity test macro under hot conditions according to claim 1, is characterized in that: described weight is steel cylinder, is provided with one and high temperature electrode groove of the same size on this right cylinder, and described high temperature electrode is stuck in groove.

6. material surface resistivity test macro under hot conditions according to claim 1, is characterized in that: described high temperature transmission line is graphite line.

7. according to material surface resistivity test macro under the hot conditions described in claim 1-6 any one, it is characterized in that: also comprise for measure test sample temperature infrared thermometer and/or for heat test sample high temperature furnace.