A Kinetic Study of the Effect of Basicity on the Mold Fluxes Crystallization |
| |
Authors: | Lejun Zhou Wanlin Wang Fanjun Ma Jin Li Juan Wei Hiroyuki Matsuura Fumitaka Tsukihashi |
| |
Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, P. R. China;(2) Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa Chiba, 277-8561, Japan; |
| |
Abstract: | The effect of basicity on the mold fluxes crystallization was investigated in this article. The time-temperature-transformation
(TTT) diagrams and continuous-cooling-transformation (CCT) diagrams of mold fluxes with different basicity were constructed
by using single, hot thermocouple technology (SHTT). The results showed that with the increase of basicity, the incubation
time of isothermal crystallization became shorter, the crystallization temperature was getting higher, and the critical cooling
rate of continuous cooling crystallization became faster. The X-ray diffraction analysis suggested that calcium silicate (CaO·SiO2) was precipitated at the upper part of the TTT diagram and cuspidine (Ca4Si2O7F2) was formed at the lower part, when the basicity of mold fluxes was within 1.0 to 1.2. However, when basicity was 0.8, only
the cuspidine phase was formed. A kinetic study of isothermal crystallization process indicated that the increase of the basicity
tended to enhance the mold flux crystallization, and the crystallization activation energy became smaller. The crystallization
mechanism of cupsidine was changing from one-dimensional growth to three-dimensional growth with a constant number of nuclei,
when the basicity of mold fluxes varied from 0.8 to 1.2. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|