High-aspect-ratio ZrC whiskers:Synthesis,growth mechanism and electromagnetic wave absorption properties  

作　　者：Yao Guo Qiang Song Leilei Zhang Xu Yang Wei Li Fei Zhao Shouyang Zhang Lehua Qi 

机构地区：[1]State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Northwestern Polytechnical University,Xi'an,710072,China [2]School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an,710072,China

出　　处：《Journal of Materiomics》2023年第2期235-243,共9页无机材料学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51872234,51872232 and 52231004);the Joint Funds of the National Natural Science Foundation of China(Grant No.U21B2067);the Key R&D Program of Shaanxi Province(Grant Nos.2019ZDLGY04-02 and 2021ZDLGY14-04)and Natural Science Basic Research Plan in Shaanxi(2022JC-25).

摘　　要：Stealth materials with high dependability at elevated temperatures and outstanding mechanical properties are urgently needed for practical applications.As one-dimensional ultrahigh temperature ceramic(UHTC)materials,zirconium carbide whiskers(ZrCw)have attracted a great deal of attention due to their desirable mechanical and ablation resistance performance in high-temperature environments.We have successfully synthesized ZrCw using a carbothermal reduction technique without the introduction of metal catalytic in this paper.ZrCw shows a typically prismatic structure with the diameter of 1e2 mm and the aspect ratio of up to 250.The growth of ZrCw is controlled by a solid-liquid-solid(SLS)and vaporsolid(VS)compound mechanism in conjunction with the auxiliary action of mesophase Na3ZrF7.The ZrCw/paraffin hybrids achieve the minimum reflection loss(RL(min))of
25.77 dB at 13.28 GHz under the thickness of 1.25 mm,and reach an effective absorption bandwidth(EAB)of 3.04 GHz(14.96 e18.00 GHz)with a thickness of only 1.0 mm.This work presents a promising approach for large-scale producing high-purity whiskers,and verifies that ZrCw has extensive application prospects in the field of stealth materials.

关 键 词：ZrC whiskers MICROSTRUCTURE Carbothermal reduction Growth mechanism Electromagnetic wave absorption 

分 类 号：TB33[一般工业技术—材料科学与工程]