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首页> 外文期刊>ISIJ international >Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels
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Viscosity and Crystallization Behavior of F-free Mold Flux for Casting Medium Carbon Steels

机译：铸造中碳钢的无氟铸模熔剂的粘度和结晶行为

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摘要

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_2O/Li_2O content; while it decreases with the increase of cooling rate and the addition of B2O_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)Si_4B_2O_22) and calcium magnesium silicate (Ca_(14)Mg_2(SiO_4)_8. Through the comprehensive comparison, the designed F-free mold fluxes flux Sample E (Basicity 1.15, Na_2O 7.92, Li_2O 1.97 and B_2O_3 5.98) has the closest performances to the benchmark conventional mold flux Sample A.
机译：粘度和结晶度是表征保护渣的润滑和传热性能的基本特性。因此，本文采用旋转圆筒法和单/双热电偶技术（SHTT / DHTT），研究了常规的含氟市售模具熔剂和新设计的无氟模具熔剂的粘度和结晶行为。结果表明，设计的无氟脱模剂的粘度接近含氟脱模剂；无F型保护渣的结晶温度随着碱度和Na_2O / Li_2O含量的增加而增加。而随着冷却速度的增加和B2O_3的添加而降低。在DHTT测试中，无F的保护渣的最终稳态结构表明，它由主要的晶体和薄的液体层（5.42-7.2％）组成，没有玻璃相。 X射线衍射结果表明，设计的无F型熔剂中形成的主要晶相为硼硅酸钙（Ca_（11）Si_4B_2O_22）和硅酸钙镁（Ca_（14）Mg_2（SiO_4）_8）。无氟的助焊剂样品E（碱度1.15，Na_2O 7.92，Li_2O 1.97和B_2O_3 5.98）具有与基准常规助焊剂样品A最接近的性能。

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  • 来源
    《ISIJ international》 |2015年第9期|1916-1924|共9页
  • 作者

    Lejun ZHOU; Wanlin WANG; Kechao ZHOU;

  • 作者单位

    State Key Laboratory of Power Metallurgy, Central South University, No. 932, South Lushan Road, Changsha, 410083 P. R. China,School of Metallurgy and Environment, Central South University, No. 932, South Lushan Road, Changsha, 410083 P. R.China;

    School of Metallurgy and Environment, Central South University, No. 932, South Lushan Road, Changsha, 410083 P. R.China;

    State Key Laboratory of Power Metallurgy, Central South University, No. 932, South Lushan Road, Changsha, 410083 P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    F-free mold fluxes; medium carbon steel; continuous casting; viscosity; crystallization;

    机译：无氟的保护渣;中碳钢连铸;粘度结晶;

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