On the nonlinear behavior of Young's modulus of carbon-bonded alumina at high temperatures

被引：11

作者：

Luchini, Bruno ^{[1
]}

Grabenhorst, Joern ^{[1
]}

Fruhstorfer, Jens ^{[1
]}

Pandolfelli, Victor C. ^{[2
]}

Aneziris, Christos G. ^{[1
]}

机构：

[1] TU Bergakad Freiberg, Inst Ceram Glass & Construct Mat, Freiberg, Germany

[2] Univ Fed Sao Carlos, Mat Microstruct Engn Grp GEMM, Dept Mat Engn, Sao Carlos, SP, Brazil

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2018年 / 101卷 / 09期

关键词：

carbon materials; carbon-bonded alumina; refractory; thermal expansion mismatch; young's modulus;

D O I：

10.1111/jace.15575

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The origin of the nonlinear behavior of the Young's modulus (E) of carbon-bonded alumina at high temperatures was addressed, based on the microstructural changes observed during processing and their thermo-mechanical properties. Impulse excitation technique, thermogravimetric analysis, porosity measurement, and scanning electron microscopy were conducted in order to highlight and explain the E behavior. The finite element model of a virtual microstructure was simulated and the results attained are in good agreement with the experimental data. The tests revealed that the Young's modulus of a cured sample heated from room temperature up to 500 degrees C was governed by the release of volatiles. Above this temperature, the thermal expansion mismatch among alumina, graphite, and the carbon matrix is dominant resulting in an increase in the effective Young's modulus. During cooling, crack networks and gaps between alumina particles and the carbon matrix were developed. The former were induced by volatile release and by the graphite's highly anisotropic thermal expansion. The latter was derived by the thermal expansion mismatch between the alumina and the carbon matrix. The closure of the gaps and cracks governed the expansion behavior during the second heating cycle and a nonlinear effective Young's modulus increase as a function of temperature was observed.

引用

页码：4171 / 4183

页数：13

共 46 条

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