Shaanxi Key Laboratory of Macromolecular Science and Technology, MOE Key Laboratory of Materials Physics and Chemistry in Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an710072, P.R. China.
ACS Appl Mater Interfaces. 2023 Jan 25;15(3):4234-4245. doi: 10.1021/acsami.2c20397. Epub 2023 Jan 17.
Precursor-derived silicoboron carbonitride ceramic (PDC-SiBCN) has attracted significant attention as an advanced electromagnetic (EM) wave-absorbing material. However, the inherent porous and brittle characteristics limit its application as a structural load component in an EM interference environment. In this study, phase-transformation HfO nanoparticles were incorporated into PDC-SiBCN to reduce volume shrinkage, improve bonding interactions, and control structural defects, simultaneously boosting the plastic deformation and EM performance of brittle ceramics. The obtained HfO/SiBCN ceramic showed enhanced flexural strength of up to 430.1% compared with that of the pure SiBCN ceramic. Furthermore, the HfO/SiBCN ceramic also demonstrated excellent high-temperature EM absorption. The minimum reflection coefficient (RC) could reach -45.26 dB, and the effective absorption bandwidth (EAB) covered 2.80 GHz of the X band at 2.28 mm thickness at room temperature. Furthermore, the RC can still reach -44.83 dB, and the EAB can cover 2.4 GHz at 1.58 mm even at 1073 K. This work shows that phase-transformation nanoparticles could simultaneously improve the deformation ability and EM wave absorption properties of SiBCN ceramics. The results could guide the design and preparation of PDCs with strong carrying capacity and excellent EM absorption, even in harsh environments.
先驱体衍生的硅硼碳氮陶瓷（PDC-SiBCN）作为一种先进的电磁波（EM）吸收材料引起了广泛关注。然而，其固有的多孔和脆性特征限制了它在电磁干扰环境中作为结构承载部件的应用。在本研究中，将相变 HfO 纳米颗粒掺入 PDC-SiBCN 中，以减少体积收缩，改善键合相互作用，并控制结构缺陷，同时提高脆性陶瓷的塑性变形和 EM 性能。与纯 SiBCN 陶瓷相比，所获得的 HfO/SiBCN 陶瓷的抗弯强度提高了 430.1%。此外，HfO/SiBCN 陶瓷还表现出优异的高温吸波性能。最小反射系数（RC）可达-45.26 dB，在室温下 2.28mm 厚度下，X 波段的有效吸收带宽（EAB）可覆盖 2.80GHz。此外，在 1073K 时，RC 仍可达-44.83 dB，EAB 可覆盖 2.4GHz，厚度为 1.58mm。这项工作表明，相变纳米颗粒可以同时提高 SiBCN 陶瓷的变形能力和电磁波吸收性能。研究结果可以为具有强承载能力和优异吸波性能的 PDC 设计和制备提供指导，即使在恶劣环境下也是如此。
