발간논문

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Vol.36, No.1, 84 ~ 93, 1998
Title
Effects of Inert Filler and Si Contents on Kinetics of Pack Siliconizing of Mo
윤진국 , 변지영 , 김재수 , 최종술 Jin Kook Yoon , Ji Young Byun , Jae Soo Kim , Chong Sool Choi
Abstract
The effect of inert fillers and Si contents on pack siliconizing kinetics of pure molybdenum was investigated in the range of 1273K-1473K. Si contents were varied from 1wt%Si to 40wt.%Si. Al₂O₃, and SiC powders were used as inert fillers. Similar coating microstructures were obtained and the growth rate of MoSi₂ coatings was observed to be proportional to the square root of time regardless of whether inert filler was Al₂O₃, or SiC. The dependence of parabolic growth rate constant of MoSi₂ coatings on the square root of Si contents was changed at the standard of 10wt.%Si. Apparent activation energy for the growth of MoSi₂ coatings was obtained to be 193 KJ/mole. Under the quasi steady state assumption, if the transport rate of Si containing gases in the pack is varied with Si contents and inert fillers, the surface composition of coatings tends to shift to another value which will re-satisfy the requirement of zero Si transport rate difference between gas diffusion and solid diffusion on the coating surface Therefore, pack siliconizing kinetics of pure molybdenum was controlled by a self-adjusted mechanism which combined the Si transport capability of gas diffusion in the pack and solid diffusion in the Mo substrate.
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