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Phase evolution and properties of (VNbTaMoW)C high entropy carbide prepared by reaction synthesis
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2020-03-19 , DOI: 10.1016/j.jeurceramsoc.2020.03.020
Diqiang Liu , Aijun Zhang , Jiangang Jia , Junhu Meng , Bo Su

(VNbTaMoW)C high entropy carbide was fabricated by reaction synthesis using the constituent metal and graphite powders as raw materials. Phase formation and composition uniformity are analyzed using XRD, EDS and SEM. The phase composition for samples sintered at 1600℃ includes TaC, NbC, WC, MoC and VC according to XRD peak fitting and deconvolution. Samples sintered at 1850℃ form a single phase high entropy carbides, which exhibit high microhardness and relatively lower thermal conductivity of 9.2 W/m.K-1 at room temperature compared with binary carbides. Severe lattice distortion and high concentration of point defects are responsible for the low thermal conductivity of the high entropy (VNbTaMoW)C.



中文翻译:

反应合成法制备(VNbTaMoW)C高熵碳化物的相变和性能

(VNbTaMoW)C高熵碳化物是以金属成分和石墨粉为原料,通过反应合成法制备的。使用XRD,EDS和SEM分析相形成和组成均匀性。根据XRD峰拟合和去卷积,在1600℃烧结的样品的相组成包括TaC,NbC,WC,MoC和VC。在1850℃烧结的样品形成单相高熵碳化物,与二元碳化物相比,它们在室温下具有较高的显微硬度和相对较低的9.2 W / mK -1导热系数。严重的晶格畸变和高点缺陷浓度是造成高熵(VNbTaMoW)C导热系数低的原因。

更新日期:2020-03-19
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