Growth kinetics of titanium carbide coating by molten salt synthesis process on graphite sheet surface  

作　　者：Xiaoyu Shi Chongxiao Guo Jiamiao Ni Songsong Yao Liqiang Wang Yue Liu Tongxiang Fan 

机构地区：[1]State Key Lab of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1858-1864,共7页矿物冶金与材料学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.52171144);the Fundamental Research Special Zone Program of Shanghai Jiao Tong University(No.21TQ1400215).

摘　　要：The synthesis of carbide coatings on graphite substrates using molten salt synthesis(MSS),has garnered significant interest due to its cost-effective nature.This study investigates the reaction process and growth kinetics involved in MSS,shedding light on key aspects of the process.The involvement of Ti powder through liquid-phase mass transfer is revealed,where the diffusion distance and quantity of Ti powder play a crucial role in determining the reaction rate by influencing the C content gradient on both sides of the carbide.Furthermore,the growth kinetics of the carbide coating are predominantly governed by the diffusion behavior of C within the carbide layer,rather than the chemical reaction rate.To analyze the kinetics,the thickness of the carbide layer is measured with respect to heat treatment time and temperature,unveiling a parabolic relationship within the temperature range of 700-1300℃.The estimated activation energy for the reaction is determined to be 179283 J·mol^(-1).These findings offer valuable insights into the synthesis of carbide coatings via MSS,facilitating their optimization and enhancing our understanding of their growth mechanisms and properties for various applications.

关 键 词：titanium carbide GRAPHITE molten salt kinetic analysis 

分 类 号：TB306[一般工业技术—材料科学与工程]