Abstract
An apparatus has been constructed for measuring the static Young's modulus of carbons in bending at high temperature. The specimen is heated in a graphite tube furnace and its deflection under load is determined by measuring the deflection at three points with Linear Variable Differential Transformers and appropriate electronic circuits. The force-deflection curves are recorded on an X–Y recorder. Four basic types of carbons were measured, namely, those prepared from (1) soft filler–soft binder, (2) soft filler–hard binder, (3) hard filler–soft binder, and (4) hard filler–hard binder. The usual maximum at about 1800°C was observed for graphitized soft filler bodies; bodies with hard filler showed only a continuous decrease in modulus with increase of temperature. A system of temperature curves was obtained for soft filler–soft binder and for hard filler–hard binder rods as they were heat treated to successively higher temperatures. All the Young's modulus curves show maxima shifting in position with heat treatment except for the graphitized hard filler material.
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