CAJ | 학술논문

采用真空加压浸渍法，在C/C多孔体中浸渍TaF5溶液制备TaC晶须。通过扫描电镜(SEM)观察TaC形貌，发现晶须呈单根或束状，且晶须光滑、平直，直径小于1μm。晶须头部的球状液滴表明其生长机理为气-液-固(V-L-S)机制，但反应过程中的球状液滴不是由催化剂与反应体系形成的共融球，而是生成TaC晶须的反应组元Ta2O5液滴，由TaF5高温水解生成。热解炭原子在单个或团簇的Ta2O5液滴中扩散生长出单根或束状的TaC晶须。
채용진공가압침지법，재C/C다공체중침지TaF5용액제비TaC정수。통과소묘전경(SEM)관찰TaC형모，발현정수정단근혹속상，차정수광활、평직，직경소우1μm。정수두부적구상액적표명기생장궤리위기-액-고(V-L-S)궤제，단반응과정중적구상액적불시유최화제여반응체계형성적공융구，이시생성TaC정수적반응조원Ta2O5액적，유TaF5고온수해생성。열해탄원자재단개혹단족적Ta2O5액적중확산생장출단근혹속상적TaC정수。
Tantalum carbide (TaC) whiskers were successfully synthesized by impregnating TaF5 solution into porous carbon/carbon (C/C) preform. Morphological observation shows that TaC whiskers are fairly smooth and straight, and their diameters are less than 1 μm. The spherical liquid droplets at the tips indicate TaC whiskers are developed by vapour-liquid-solid (VLS) growth mechanism. The liquid droplets are not the melt sphere resulted from the catalyzer and reactant but the spherical Ta2O5 liquid droplets, which hydrolyzed from TaF5. The formation of single or bundle TaC whiskers is involved with the diffusion of carbon atom in single or conglomeration of Ta2O5 liquid droplets.