Test principle and method of resistivity According to the reported method of measuring the resistivity or conductivity of some conductive refractories, the foreign related carbon and graphite resistivity test standards and the Japanese Shinagawa company's refractories resistance measurement method, combined with conductive refractories The characteristics of the use of DC dual-arm bridge to measure the resistance of the sample, and then according to the size of the sample according to the formula Q = R # S / L to calculate the resistivity of the sample, where: Q is the resistance of the sample Rate, 8 # m; R is the measured resistance of the sample; S is the average cross-sectional area of ​​the sample, m2; L is the length of the sample, the tester can only measure the resistance value of the conductive refractory sample at room temperature. The structure and characteristics of the resistivity tester The structure of the conductive refractory material at room temperature resistivity tester. Compression device test proves that the first condition for accurately measuring the resistivity of the refractory material is that the contact between the pressure plate and the surface of the sample to be tested must be good and stable, and therefore there are certain requirements for the pressure plate and the sample. In addition, the resistance measurement is closely related to the pressure on the sample. A number of tests have shown that after applying a pressure of >3.0 MPa on the sample, the change in the resistivity value tends to zero.
When determining the resistivity of the refractories, it was determined that the pressure applied on the tested samples was 3.3 MPa. Considering the specific characteristics of the refractories, careful consideration was taken in the structure of the tester to make it practical, convenient and accurate. . 1. Hydraulic station 2. Intake and return tubing 3. Cylinder 4. Upper and lower platens 5. Pressure sensor 6. Slide rail 7. Smart digital display controller 8. DC dual-arm bridge 9. Control button The tester adopts hydraulic pressure The pressurization system exerts the advantages of large hydraulic system pressure, compact structure, stable operation, stepless speed regulation, and continuous display. Pressure and flow control valves are used during operation to gradually increase the pressure on the specimen. When approaching the predetermined value, the supercharging speed becomes very slow. In this way, the end face of the sample can be brought into contact with the pressure head to be stable and the measurement result is accurate.
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