Studies on Young's Modulus of Graphites (II)
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概要
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Further studies of the in-vacuum Young's modulus as a function of temperature ranging from room temperature up to 1000®C have been examined on various artificial and natural graphites. The modulus (E) vs. temperature (T) relationship when temperature is elevated up has been found to satisfy the following empirical formular;<BR>E<SUB>T</SUB>/E<SUB>50</SUB>=a+bT+cT<SUP>2</SUP>, <BR>where E<SUB>50</SUB> denotes the modulus at 50®C. The minimum value of Young's modulus for porous graphites is indicated at about 400®C, while that for dense specimens appears around 250®C. Also in the increasing rate of modulus, the porous ones definitely predominate the dense ones. As to the effect of heat treatment temperature (HT), the characteristic hysteresis in the E vs. T curve tends to diminish with decreasing HT. The coefficient c in the above formular is found to increase as HT is elevated. The temperature dependency of E for natural graphite compacts is strongly affected by the apparent density as well as by the presence of binder materials.
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