CONTACT DEVICE TO DETERMINE ELECTRIC RESISTANCE OF POWDER MATERIAL UPON ITS COMPRESSION

摘要

FIELD: instrumentation.SUBSTANCE: invention relates to area of determination of the electro-physical parameters of the powder materials, and to area of determination of the parameter values characterizing physical and chemical properties of materials according to electrical resistance. Contact device to determine the electric resistance of the powder material upon its compression contains the measuring cell with isolating bush to locate in it the studied material sample, movable and fixed cylindrical electrodes for the sample compression and registration of its resistance change, they are made with lead-in part for locating in the bush; assemblies for creation and measuring of the movable electrode movement. The device novelty is that assemblies for creation and measuring of the movable electrode movement are separated by design. At that the sensitive element of the measuring assembly is kinematically connected with the movement making assembly. The lead-in part of each electrode is made stepped. Step looking to the specimen has lesser diameter and is made with unloading groove on the outside surface, and step with greater diameter is made to interface with the insulating bush. At that bush length L, lead-in part length lof the electrodes, and length lof the interfaced step of the electrodes in the initial state are selected from the definite geometrical conditions. To ensure possibility of measurements of the powder material specimen being in the inert environments the measuring cell is installed in the tight pipe. To ensure operation characteristics of the contact device linked with possibility of visualization of the specimen and process of its sealing the tight pipe and insulation bush are made transparent.EFFECT: increased accuracy and expansion pf density measurements range, and hence increased accuracy of electric resistance determination for the studied powder material.3 cl, 4 dwg