摘要
提出了与纯扩散、反应扩散及混合扩散控制相关联的Biot数表征方法用来表征样品的厚度,建立了真空渗碳/渗氮过程体扩散系数D和界面传递系数β的阻抗谱模型,用于过程的原位表征。仿真与实验结果表明:阻抗谱形状特点与Biot数关联,可判断扩散机制,并且能准确获得体扩散系数D和表面传递系数β的数值。
Biot number characterization methods associated with pure diffusion,reaction diffusion,and mixed diffusion control were proposed to characterize the thickness of the sample.Impedance spectroscopy models of the bulk diffusion coefficient(D)and surface transfer coefficient(β)of vacuum carburizing/nitriding process were established for in-situ characterization of the kinetic process.The simulation and experimental results show that the impedance spectrum correlates to the Biot number,and clearly shows the reaction-diffusion mechanism,,and the values of the bulk diffusion coefficient and the surface transfer coefficient can be obtained accurately.
作者
王一亨
闫扶摇
张雁祥
徐跃明
闫牧夫
WANG Yi-heng;YAN Fu-yao;ZHANG Yan-xiang;XU Yue-ming;YAN Mu-fu(National Key Laboratory for Precision Hot Processing of Metals,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Beijing Research Institute of Mechanical&Electrical Technology Ltd,Beijing 100083,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第12期129-134,共6页
Transactions of Materials and Heat Treatment
基金
科技部重点研发项目课题(2018YFB2001901)。
关键词
真空热扩渗
阻抗谱模型
扩散系数
传递系数
vacuum thermal diffusion
impedance model
diffusion coefficient
surface transfer coefficient
