Super-thermal insulating and high-strength ceramic film assembled by Si_(3)N_(4) nanowire-BN nanosheet dual-phase intertwined structure  

作　　者：Haiyang Li Leilei Zhang Yeye Liu Mengjiao Li Hejun Li 

机构地区：[1]Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Nano Research》2025年第2期796-805,共10页纳米研究(英文版)

基　　金：This work was supported by the Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China(No.136 QP-2015);the Key Scientific and Technological Innovation Research Team of Shaanxi Province(No.2022TD-31);the Key R&D Program of Shaanxi Province(No.2021ZDLGY14-04);the National Training Program of Innovation and Entrepreneurship for Undergraduates(No.XN2022023);the Joint Funds of the National Natural Science Foundation of China(No.U21B2067).

摘　　要：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 Si_(3)N_(4) nanowire-boron nitride(BN)nanosheet(SNB)with an intertwined structure,where BN nanosheets are firmly intertwined on the surface of Si_(3)N_(4) 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 Si_(3)N_(4) nanowire film(SN)without BN nanosheets incorporation.Simultaneously,benefiting from the interface and cross-linking nodes formed between Si_(3)N_(4) 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℃.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.

关 键 词：Si_(3)N_(4)nanowire boron nitride(BN)nanosheet intertwined structure thermal insulating HIGH-STRENGTH 

分 类 号：TB383[一般工业技术—材料科学与工程] TB33