摘要
传统陶瓷材料的刚性结构变形能力非常有限, 通常在很小的应变下就发生断裂. 具有层状原子结构的陶瓷, 原子层间存在较弱的相互作用, 因而具有大的变形潜力. 我们以氮化硼(BN)为例, 研究了该类陶瓷的室温压缩行为. 分别以洋葱结构BN纳米颗粒和石墨状六方BN纳米片为原料, 采用放电等离子烧结(SPS)技术分别制备了BN-I和BN-II陶瓷材料. 在BN-I中, 随机取向的BN纳米薄片构成三维互锁的结构, 而在BN-II中, BN纳米薄片表现出垂直于SPS压缩方向的择优取向. BN-I的压缩强度为343 MPa, 断裂应变为4.2%. 相比之下, BN-II的强度和应变分别为112 MPa和2.2%. 不同的微观组织结构导致了BN-I和BN-II压缩性能的差异. 此外, 这两种陶瓷材料均表现出1.1%的塑性变形. 该研究表明, 对于具有层状原子结构的陶瓷, 其纳米片作为结构基元构筑成无(或低)择优取向的三维互锁结构, 有望同时提高其强度和变形能力.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC, 91963203, 51672238, 51772260, 51722209 and 51525205). Zhao Z acknowledges the 100 Talents Plan of Hebei Province (E2016100013), the NSF for the Distinguished Young Scholars of Hebei Province (E2018203349).
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Author contributions Tian Y and Zhao Z conceived the project. Wu Y, Zhang Y, Zhang S, Zhao Z, and Tian Y designed the experiments. Wu Y prepared the oBN nanoparticles. Wu Y, Zhang Y and Zhang S conducted the SPS experiments. Wang X, Liang Z, and Hu W performed the SEM characterization. Wu Y, Zhang Y and Zhang S conducted the XRD measurements and uniaxial compression tests. Wu Y, Zhang Y, Zhao Z, Tian Y, Yu D, He J, Xu B and Liu Z analyzed the data. Wu Y, Zhang Y, Zhao Z, Xu B and Tian Y co-wrote the paper. All authors discussed the results and commented on the manuscript.
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Yingju Wu is currently a PhD candidate in the Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University. He obtained his bachelor degree in the School of Materials Science and Engineering, Shandong University of Technology in 2014. His current research focuses on the structure and property regulation of advanced structural ceramics.
Yang Zhang received his PhD degree from Yanshan University in 2017. Then, he worked as a postdoctoral fellow at the School of Science, Yanshan University. His current research interests focus on the advanced structural ceramics, and the design and synthesis of novel metastable materials.
Shuangshuang Zhang is currently a PhD candidate in CHiPS, State Key Laboratory of Matestable Materials Science and Technology, Yanshan University. She obtained her bachelor degree in the School of Materials Science and Engineering, Anhui University of Science and Technology in 2015. Her current research focuses on the design and synthesis of new metastable carbon materials.
Zhisheng Zhao graduated from Jiamusi University with a bachelor’s degree in 2007, and received his PhD degree in materials physics and chemistry from Yanshan University in 2012. Currently, he works as a professor in CHiPS, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University. His research focuses on the theoretical design, high-pressure synthesis, and performance regulation of new metastable materials.
Yongjun Tian is a professor at CHiPS, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University. He received his PhD degree from the Institute of Physics, Chinese Academy of Sciences in 1994, and worked as a postdoctoral fellow at the Universitat Jena supported by Humboldt Research Fellowships from 1996 to 1998. His research interests include the design and synthesis of superhard materials and novel metastable materials.
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Wu, Y., Zhang, Y., Zhang, S. et al. The rise of plastic deformation in boron nitride ceramics. Sci. China Mater. 64, 46–51 (2021). https://doi.org/10.1007/s40843-020-1466-0
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DOI: https://doi.org/10.1007/s40843-020-1466-0