Inflection and its porosity effect on elastic limit of graphite at ultra-high temperature

被引：0

作者：

Liu Z. ^{[1
]}

Bao Y. ^{[1
]}

Wan D. ^{[1
]}

机构：

[1] State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2018年 / 46卷 / 04期

关键词：

Elastic limit; Graphite; Porosity; Ultra-high temperature; Young's modulus;

D O I：

10.14062/j.issn.0454-5648.2018.04.12

中图分类号：

学科分类号：

摘要：

It was supposed that the Young's modulus of the isostatically pressed graphite could go up with the increase of temperature until a critical value. This conjecture has not been verified yet, especially for the peak value of graphite elastic limit and the corresponding affecting factors. Although three-point bending method is effective to estimate the Young's modulus of ceramics, it is unavailable to be used at ultra-high temperature due to the difficulties of obtaining a precise deflection at such high temperature. This paper was to measure the varying modulus of graphite at different temperatures (up to 2 000 °C) by the modified three-point method and investigate the effect of porosity on the elastic limit of graphite at ultra-high temperature. The results indicate that the inflection point for increasing graphite modulus with temperature occurs at 1 700-1 800 °C, and graphite with a porosity of 16.5% possesses the optimized modulus over 1 500 °C, representing the elastic limit of graphite at ultra-high temperature. ©2018, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：537 / 540

页数：3

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