Controlling the shear thinning property of calcium silicate melts by addition of Si3N4

Shin, Seung-Ho; Cho, Jung‐Wook; Kim, Seon-Hyo

doi:10.1016/j.jnoncrysol.2015.04.043

Cited by 17 publications

(14 citation statements)

References 13 publications

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“…[17][18][19] Recently, silicon nitride (Si 3 N 4 ) is also considered as an additive to the mold fluxes in order to vary the melt viscosity and their rheological behavior. Non-Newtonian behavior has been observed in oxynitride melts, [20][21][22] however, the detailed mechanism of its variations remains unresolved. Si 3 N 4 has also been used to improve the properties of glass materials 23) where nitrogen concertation is commonly altered at a fixed cationic composition to compare the glass properties.…”

Section: Viscosity Of Na-si-o-n-f Melts: Mixing Effect Of Oxygen Nitmentioning

confidence: 99%

“…Overall, the present Na-Si-O-N-F system did not show a clear non-Newtonian behavior, which has been reported in some of the multi-anion containing systems. [20][21][22]40) The viscosity measurements for a wider shear rate range (e.g., 1-40 s -1 ) will be required to precisely clarify the rheological behavior of the present fluoroxynitride system. Fig.…”

Section: Viscosities and Rheological Behavior Of Na-si-o-n-f Systemmentioning

confidence: 99%

“…57) Shiraishi and Harada 20) reported this non-Newtonian behavior in an oxynitride melts (Ca-Si-Al-O-N system with ca., 15 eq%N). Shin et al 22,40) demonstrated the non-Newtonian behavior for some of the oxyfluoride system (Ca-Na-Mg-Si-Al-O-F melt with ca., 6-7 eq% F). However, this viscosity variation was not observed for either the oxyfluoride nor oxynitride system in the present study in the given shear rate range of 11-17 s -1 .…”

Section: Rheological Behaviormentioning

confidence: 99%

“…Our conclusion for oxyfluoride system agrees with that by Dingwell,58) in which a Newtonian behavior was observed for Ca-Mg-Si-O-F melts (0-13 eq% F). Watanabe et al 21) and Shin et al 22) reported the non-Newtonian behavior in fluoroxynitride (Ca-Li-Na-Mg-Si-Al-O-F-N system with ca., 3.8 eq% F and 0.9 eq% N, 21) Ca-Na-Mg-Si-Al-O-F-N system with ca., 6 eq% F and 0-23 eq% N 22) ) systems. The viscosities of these liquid drastically decrease by increasing the shear rate of less than 50 s -1 whereas the rheological behavior was not clearly detected for the present fluoroxynitride (i.e., Na-Si-O-N-F) melts.…”

Section: Rheological Behaviormentioning

confidence: 99%

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Viscosity of Na–Si–O–N–F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine

et al. 2020

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Section: Viscosity Of Na-si-o-n-f Melts: Mixing Effect Of Oxygen Nitmentioning

confidence: 99%

Section: Viscosities and Rheological Behavior Of Na-si-o-n-f Systemmentioning

confidence: 99%

Section: Rheological Behaviormentioning

confidence: 99%

Section: Rheological Behaviormentioning

confidence: 99%

See 2 more Smart Citations

Viscosity of Na–Si–O–N–F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine

et al. 2020

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“…During the continuous casting process of steel, mold fluxes infiltrating into the shell-mold gap are subjected to shear stress from the mold oscillation and the slab movement [7,8,9,10,11,12,13], as shown in Figure 1. The crystallization of mold fluxes is affected by the shear stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al2O3-SiO2-Na2O-CaF2 Slags

Wen

Ding

et al. 2018

Materials

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How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement, which affects the crystallization performance of slags. The quantitative effect of slags’ crystallization performance by shear stress is studied to develop a low-basicity and high-crystallization mold flux to solve the above problem. The results show that the crystallization kinetic condition is promoted, and the crystallization activation energy is reduced by the shear stress, which leads to an increase in the crystallization temperature. Concurrently, the crystal size is reduced. However, the shear stress has no effect on the crystalline phase. The influence of different shear stresses on the crystallization ability of molten slags is related to the crystal nucleation and growth mechanisms. The crystalline fraction of the slag films at 300 rpm (69 s−1) is 44.7%, which is an increase of 17.7% compared with the crystalline fraction of the slag films at 200 rpm (46 s−1). Moreover, the shear stress has little effect on the lubricating properties of the mold fluxes, although the crystallization ability is promoted by the agitation.

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