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Research Article | Open Access

Super-thermal insulating and high-strength ceramic film assembled by Si3N4 nanowire-BN nanosheet dual-phase intertwined structure

Haiyang Li, Leilei Zhang( ), Yeye Liu, Mengjiao Li, Hejun Li
Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China
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Graphical Abstract

We employed a precursor pyrolysis and vacuum filtration strategy to construct a film with dual-phase intertwined structure that exhibits exceptional mechanical and thermal insulating properties. The film with intertwined structure is designed to reduce thermal conduction and decrease thermal convection, thereby achieving efficient thermal insulating.

Abstract

In the thriving fields of thermal management fields, ceramic films with superior thermal insulation and excellent mechanical properties are in high demand. Nevertheless, the fabrication of ceramic films that combine both mechanical performance and low thermal conductivity remains highly challenging. Herein, we report a dual-phase Si3N4 nanowire-boron nitride (BN) nanosheet (SNB) with an intertwined structure, where BN nanosheets are firmly intertwined on the surface of Si3N4 nanowires. The results demonstrate that the SNB film possesses exceptional mechanical properties, with a tensile strength of 5.25 MPa, representing a 127% improvement over the Si3N4 nanowire film (SN) without BN nanosheets incorporation. Simultaneously, benefiting from the interface and cross-linking nodes formed between Si3N4 nanowires and BN nanosheets, the thermal conductivity of the SNB film is as low as 0.043 W·m–1·K–1, marking a 23% reduction compared to the SN film without BN nanosheets. Furthermore, the all-ceramic component characteristic endows the SNB film with high temperature resistance up to 1200 °C. The combination of high strength, low thermal conductivity, and high-temperature resistance enables the SNB film a promising candidate for applications in high temperature environments.

Keywords

Si3N4 nanowireboron nitride (BN) nanosheetintertwined structurethermal insulatinghigh-strength

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Nano Research
Volume 18 Issue 2,
February 2025
Article number: 94907090
DOI: 10.26599/NR.2025.94907090
Cite this article:
Li H, Zhang L, Liu Y, et al. Super-thermal insulating and high-strength ceramic film assembled by Si3N4 nanowire-BN nanosheet dual-phase intertwined structure. Nano Research, 2025, 18(2): 94907090. https://doi.org/10.26599/NR.2025.94907090
Topics:
NanosheetsNanostructuresNanowiresThin films

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Received: 08 September 2024
Revised: 20 October 2024
Accepted: 22 October 2024
Published: 03 January 2025
© The Author(s) 2025. Published by Tsinghua University Press.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/).
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