SU1275281A1 - Device for finding specific resistance of bulk materials - Google Patents

Abstract

The invention relates to a technique for measuring the electrical properties of materials and can be used, in particular, to study the electrical resistivity of ferroalloy materials. The aim of the invention is to improve the accuracy of electrical resistivity measurements by reducing the effect on the measurement results of segregation of sample ingredients and various pressures at the contacts. The device contains a stationary relative to the furnace electrode and a movable relative to the furnace electrode-piston. Between them, the test material is poured into a crucible with potential electrodes with translation tags embedded in it. The crucible is mounted with the possibility of longitudinal movement relative to the stationary electr (L trod. 1 Cp f-crystals, 4 ill.

Description

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The invention relates to a technique for measuring the electrical properties of materials and, in particular, can be used for the dd1 study of the electrical resistivity of ferroalloy charges.

The purpose of the invention is to improve the accuracy of measuring the electrical resistivity of bulk materials,

FIG. 1 shows schematically the proposed sensor j in FIG. 2 — a potential electrode, section A-A in FIG. 1; FIG. 3 is a diagram of the distribution of forces in a known device; Fig, 4 - the same, in the proposed device.

A split crucible 1 made of a non-conductive refractory material consists of three parts, a flat-parallel mezvdu 1 K which: two potential electrodes 2 are fixed in the form of washers with a diametrically jumper 3 of a heat-resistant conductor, graphite current electrodes are installed at the ends of the crucible - the top 4 is connected to the mechanism (not shown), and the bottom 5, the volume of the crucible between the electrodes is filled with the material under study b, the top 4 and the bottom 5 electrodes are connected to the current leads 7, which are connected to the power source 8 , In the electric circuit between the power source 8 and the current lead 7. included ammeter 9 and to potential electrodes 2 connected voltmeter 10,

The determination of the specific electrical: l resistance is as follows,

Potential electrodes 2 are placed into the connectors of the crucible 1 and fastened to the structure with a high-temperature coating j, after which they are placed on the lower current electrode 5 and loaded with the test material 6, using

this is vibroplate. Then the assembly is placed in the heating zone and the lower electrode 5 is fixedly fixed to the structures of the furnace. In the upper part of the crucible 1, the second electrode 4, connected with the loading device, is lowered. Potential electrodes 2 are in contact with the loaded material 6, ensuring reliable contact with both the outer and the central part of the material 6.

The breakdown of contact between the lower electrode and the sample due to the increased current density in this link of the electrical circuit is restored by force F,

Claims (1)

Invention Formula 1, Device for determining bulk resistivity materials at high temperatures, containing placed at the ends of the crucible coaxial coaxially relative to the furnace electrode and a movable electrode-piston connected to the measuring system MB, characterized in that, in order to improve measurement accuracy, the crucible is installed in it with longitudinal movement relative to the placed in it with a gap of a fixed electrode, besides in it. potential electrodes are rigidly fixed. 2, the device according to claim 1, characterized in that the potential the electrodes are made with at least one diametrically-strut. jL figure 1 FIG. g 5 ff n- /:.: LB-A:. f; .6--. ./////////W7 //////// 7 i; t. / ;:. (;): /) a okshEva F 7 Fig.Z A Fy