Effect of boron doping on the thermal properties of carbon fibers reinforced lithium aluminosilicate matrix composites
Effect of boron doping on the thermal properties of carbon fibers reinforced lithium aluminosilicate matrix composites
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DOI：
10.1016/j.jeurceramsoc.2015.03.010
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发表时间：
2015-09
影响因子：
5.7
通讯作者：
L. Xia;B. Zhong;Tao Zhang;X. Hu;Songsong Wu;Jiao Yang;G. Wen
中科院分区：
文献类型：
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作者：
L. Xia;B. Zhong;Tao Zhang;X. Hu;Songsong Wu;Jiao Yang;G. Wen
采用料浆浸渍-热压工艺制备了掺硼碳纤维增强锂铝硅酸盐复合材料(CF/LAS)，并用TG-DTA、X射线衍射仪和透射电子显微镜对其进行了表征。研究了它们在不同温度下的热膨胀行为和导热性能。致密的复合材料样品(>；99%)在1350℃下烧结0.5h，X射线衍射数据表明，在掺硼的CF/LAS复合材料中存在单相的β锂辉石。B掺杂提高了CF/LAS复合材料在氧化条件下的热稳定性，且随着B含量的增加，复合材料的失重率降低。在室温至720℃的温度范围内，掺硼的CF/LAS复合材料的热膨胀几乎为零，其导热系数也高于无硼的CF/LAS复合材料。这些性能与纤维与基体之间的界面微观结构有关，这是由透射电子显微镜结果确定的。
Boron doped carbon fibers reinforced lithium aluminosilicate matrix composites (Cf/LAS) were prepared via slurry infiltration following by hot pressing procedure, and characterized by TG-DTA, XRD analysis and TEM. Their thermal expansion behavior and thermal conductivity properties were investigated across various temperatures. Dense composites samples (>99%) were sintered at 1350 °C for 0.5 h. The XRD data revealed an occurrence of single-phase β-spodumene in boron doped Cf/LAS composites. Boron doping increased the thermal stability of Cf/LAS composites in oxidizing condition, where the weight loss of Cf/LAS composites decreased with increasing boron content. Boron doped Cf/LAS composites exhibited nearly zero thermal expansion at the temperature range from room temperature to 720 °C. The thermal conductivity of boron doped Cf/LAS composites was also higher than that of boron free Cf/LAS composites. These properties were correlated with the interfacial microstructure between the fiber and the matrix as determined by TEM results.