Shu, Q., Li, Q., & Fabritius, T. (2019). Effects of MoO3 + C on Crystallization and Radiative Heat Transfer of CaO–SiO2–B2O3-Based Glassy Fluoride-Free Mold Fluxes. Metals, 9(5), 516. https://doi.org/10.3390/met9050516
Eﬀects of MoO₃ + C on crystallization and radiative heat transfer of CaO–SiO₂–B₂O₃-based glassy fluoride free mold fluxes
|Author:||Shu, Qifeng1,2; Li, Qiangqi2; Fabritius, Timo1|
1Process Metallurgy Research Unit, University of Oulu, FI-90014 Oulu, Finland
2University of Science and Technology Beijing, Beijing 100083, China
|Online Access:||PDF Full Text (PDF, 3.6 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019091828655
Multidisciplinary Digital Publishing Institute,
|Publish Date:|| 2019-09-18
The ﬂuorine in traditional mold ﬂuxes could be harmful in steel-plant environments. Accordingly, ﬂuoride-free mold ﬂuxes have received great attention in recent years. In this work, a method to adjust the crystallization and radiative heat transfer of ﬂuoride-free mold ﬂuxes is proposed. MoO₃ and C mixtures (mass ratio: 4:1) were added into CaO–SiO₂–B₂O₃-based mold ﬂuxes and produced MoB, Mo₂CB and Mo₂C foreign particles. The inﬂuences of foreign particles on the radiation of glassy CaO–SiO₂–B₂O₃-based mold ﬂuxes were investigated measuring the transmissivity of a glassy disk for light in the wavenumber range of 300 to 2500 nm. It was found that transmissivity in all wavenumber ranges were reduced and extinction coefficients were enhanced by the scattering of foreign particles. The effect of foreign particles on crystallization (devitrification) of bulk glassy CaO–SiO₂–B₂O₃-based mold fluxes was also investigated. The crystallization mechanism of glassy mold fluxes disks is mainly surface crystallization. The introduction of foreign particles induced heterogeneous nucleation and the crystallization mechanism of the bulk sample with MoO₃% = 2% changed into bulk crystallization.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
216 Materials engineering
Financial support from the Academy of Finland for Genome of steel grant (No. 311934) and Natural Science Foundation of China (NSFC contract no.51774026) is gratefully acknowledged.
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).