Ductile behavior of fine-grained, carbon-bonded materials at elevated temperatures

Ductile behavior of fine-grained, carbon-bonded materials at elevated temperatures
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细晶碳粘合材料在高温下的延展行为

DOI:
10.1016/j.carbon.2017.06.041
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发表时间:
2017
期刊:
影响因子:
10.9
通讯作者:
Biermann
Biermann
中科院分区:
材料科学2区
文献类型:
--
作者:
Solarek;Himcinschi;Aneziris;Biermann

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碳基材料在高温下具有独特的化学、物理和机械性能,广泛应用于耐火材料领域。然而,它们的高温变形机制尚不清楚。本研究揭示了在惰性气氛中观察到的温度高达1500°C的细晶碳结氧化铝和石墨(ISEM 8)的机械测试的新结果。这些结果是通过扫描电子显微镜的微观结构研究来获得的。对于Al_2O_3-C,在1300-1400℃之间出现了一个明显的最大强度-试验温度,并从脆性行为转变为延性行为。相比之下,石墨在1500℃之前强度有所增加,没有韧性变形的证据。为了解释这一现象,提出了基于部件热膨胀系数差异的模型。此外,拉曼光谱显示,由于在1500℃测试,形成了石墨化结构。
Carbon-bonded materials are widely used in refractory applications because of their unique chemical, physical, and mechanical properties at high temperatures. The mechanisms of their high-temperature deformation are, however, unclear. The present study reveals new results from mechanical testing of both fine-grained, carbon-bonded alumina and graphite (ISEM 8) observed at temperatures of up to 1500 °C in an inert atmosphere. The results were achieved by means of microstructural investigations by scanning electron microscopy. For Al2O3-C, a pronounced maximum strength vs. testing temperature occurred at 1300–1400 °C, with a change from brittle to ductile behavior. In contrast, graphite showed an increase in strength until 1500 °C and no evidence of ductile deformation. A model based on the differences in the coefficients of thermal expansion of the components is presented to explain this phenomenon. In addition, Raman spectroscopy revealed the formation of graphitic structures due to testing at 1500 °C.
DOI: --
发表时间: 1958
期刊:
影响因子: --
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