Preparation of dense SiHf(B)CN-based ceramic nanocomposites via rapid spark plasma sintering
Preparation of dense SiHf(B)CN-based ceramic nanocomposites via rapid spark plasma sintering
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DOI：
10.1016/j.jeurceramsoc.2017.04.066
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发表时间：
2017-12
影响因子：
5.7
通讯作者：
Jia-Jia Yuan-Jia;Duan Li;K. Johanns;C. Fasel;K. Durst;H. Kleebe;Z. Shen;R. Riedel;E. Ionescu
中科院分区：
文献类型：
--
作者：
Jia-Jia Yuan-Jia;Duan Li;K. Johanns;C. Fasel;K. Durst;H. Kleebe;Z. Shen;R. Riedel;E. Ionescu
采用放电等离子烧结技术，采用高升温速率(∼450℃/m in)制备了致密的SiHf(B)CN基纳米陶瓷复合材料。和高压(≥100兆帕)。用X射线衍射仪、拉曼光谱和电子显微镜对所得纳米复合材料的相组成和微观结构进行了研究，得到致密的SiHfCN纳米复合材料的硬度和弹性模量分别为26.8和367 GPa.而SiHfBCN样品的硬度为24.6 GPA，弹性模数为284 GPA。对所制备的致密陶瓷纳米复合材料的高温氧化研究表明，SiHfCN的抛物线氧化速率与超高温陶瓷(如HFC-20体积分数的碳化硅)相当，而SiHfBCN的抛物线氧化速率比UHTCs低几个数量级。这项研究的结果表明，SPS快速制备致密的纳米级含Hf陶瓷纳米复合材料是可行的，这些复合材料有望在恶劣环境下的高温应用中应用。
Dense SiHf(B)CN-based ceramic nanocomposites were prepared by spark plasma sintering (SPS) using high heating rates (∼450°C/min.) and high pressures (≥100 MPa). The obtained nanocomposites were investigated by X-ray diffraction, Raman spectroscopy and electron microscopy concerning their phase evolution and microstructure.The hardness and the elastic modulus of dense SiHfCN were found to be 26.8 and 367 GPa, respectively. Whereas the SiHfBCN samples exhibited a hardness of 24.6 GPa and an elastic modulus of 284 GPa. The investigation of the oxidation of the prepared dense ceramic nanocomposites at high temperature revealed that the parabolic oxidation rates of SiHfCN were comparable to those of ultra-high temperature ceramics (UHTCs, e.g. HfC-20 vol% SiC); whereas the parabolic oxidation rates of SiHfBCN were several orders of magnitude lower than those. The results obtained within this study indicate the feasibility of SPS for rapid preparation of dense though nano-scaled Hf-containing ceramic nanocomposites that are promising candidates for high-temperature applications in harsh environments.