Influence of Different Oxides on the Viscosity of Fluorine-Free Mold Fluxes

Benavídez, Edgardo; Santini, Leandro; Valentini, Marcelo; Brandaleze, Elena

doi:10.1016/j.mspro.2012.06.052

Cited by 21 publications

(10 citation statements)

References 13 publications

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“…Besides the experimental research works above, mathematical models have also been developed to study the viscosity of F-free mold flux. 17,18) In the respect of crystallization of F-free mold flux, Choi et al, 19) have investigated the influence of basicity on the crystallization behavior, and the results showed that the basicity tends to enhance the crystallization of the F-free glass mold flux. Fox et al,20) chose the combination of B 2 O 3 and Na 2 O as alternative substitutes for CaF 2 in billet fluxes and found that the crystallinity decreased with the increase of B 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

2015

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Viscosity and crystallization are essential properties to characterize the lubrication and heat transfer performances of mold flux. Therefore, in this paper, the viscosity and crystallization behaviors of conventional F-containing commercial mold flux and newly designed F-free mold fluxes were investigated by using rotating cylinder method and Single/Double Hot Thermocouple Technique (SHTT/DHTT). Results shows that the viscosities of designed F-free mold fluxes are close to the F-containing mold flux; and the crystallization temperatures of F-free mold fluxes increases with the increase of basicity and Na 2 O/Li 2 O content; while it decreases with the increase of cooling rate and the addition of B 2 O 3 . The final steady state structure of F-free mold fluxes during the DHTT tests shows it is composed of a major crystalline and a thin liquid layer (5.42-7.2%) without glass phase. The results of XRD indicate that the main crystalline phases formed in designed F-free mold fluxes were calcium borosilicate (Ca 11

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Section: Introductionmentioning

confidence: 99%

Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

2015

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“…(2) Using oxides like Na 2 O, K 2 O, Li 2 O, MgO, MnO, B 2 O 3 , BaO and rare earth elements oxides to compensate the negative effects of the mold flux properties caused by the absence of fluorides [9][10][11]. Although lots of works have been carried out, most of them are limited to the low carbon steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of basicity and B2O3 on viscosity, melting and crystallization behaviors of low fluorine mold fluxes for casting medium carbon steels

Zhou

Wang

et al. 2015

Met. Mater. Int.

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As potential substitutes for fluorides, the influences of basicity and B2O3 content on viscosity, melting and crystallization behaviors of low fluorine mold fluxes for casting medium carbon steels were investigated by using Brookfield viscometer and Single Hot Thermocouple Technique in this study. Results suggested that, the break temperature, crystallization temperature and critical cooling rate of low fluorine mold fluxes were increased with the increase of basicity; while they were decreased with the further addition of B2O3. Meantime, the viscosity and melting temperature range were first attenuated, and then increased greatly with the increase of basicity; however, they would tend to be reduced with the addition of B2O3 content. Also, it was found that the viscosity of mold flux is not only decided by the degree of polymerization of silicate structure, but also greatly affected by its crystallization behavior.

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“…[11][12][13][14][15] However, recently published paper from Q. Wang and K. C. Mills 16) pointed out that those fluorine free mold fluxes containing TiO2 have the risk to increase the rate of breakout due to the possible formation of high melting point Ti(C, N) and CaTiO4 that tends to deteriorate the heat transfer behavior in the mold. (2) Using oxides like Na2O, K2O, Li2O, MgO, MnO, B2O3, BaO and rare earth elements oxides to modify the negative effects of the mold flux properties caused by the absence of fluorides; [17][18][19][20][21][22] however, there is no specific crystalline phase, which shows similar properties as cuspidine, has been reported.…”

Section: Introductionmentioning

confidence: 99%

Melting and Heat Transfer Behavior of Fluorine-Free Mold Fluxes for Casting Medium Carbon Steels

et al. 2015

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As fluxing agent, fluorine is important to the properties of mold flux; however, it tends to cause serious environment and health problems. In this paper, the melting and heat transfer behaviors have been studied by using Single Hot Thermocouple Technique (SHTT) and Infrared Emitter Technique (IET). The results show that the melting temperature range of F-free mold flux decreases with the addition of Na2O/Li2O and B2O3 contents; and the heat flux decreases with the increase of basicity and Na2O/Li2O, as well as the decrease of B2O3 contents. The analysis of EDS and XRD show that Ca11Si4B2O22 and Ca14Mg2(SiO4)8 are the two main precipitated crystalline phases in F-free mold fluxes, and the Ca11Si4B2O22 is common and stable crystalline phase in the designed F-free mold fluxes system that shows the potential to replace Ca4Si2O7F2 in the conventional F-containing mold fluxes. Besides, through the comprehensive comparison, Sample E (Basicity 1.15, Na2O 7.92, Li2O 1.97 and B2O3 5.98) shows the closest performances with the benchmark conventional commercial mold flux and has the potential to be used for casting medium carbon steels.

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Influence of Different Oxides on the Viscosity of Fluorine-Free Mold Fluxes

Cited by 21 publications

References 13 publications

Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

Effect of basicity and B2O3 on viscosity, melting and crystallization behaviors of low fluorine mold fluxes for casting medium carbon steels

Melting and Heat Transfer Behavior of Fluorine-Free Mold Fluxes for Casting Medium Carbon Steels

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