MoO3和C对无氟保护渣辐射传热及结晶影响
首发时间:2018-11-21
摘要:在连铸过程中,保护渣对于铸坯与结晶器之间的传热与润滑有重要意义。本文研究了不同含量的三氧化钼和碳对于无氟保护渣辐射传热和结晶性能的影响。通过紫外-可见-近红外分光光度计测得保护渣透射率,分析可得三氧化钼和碳在高温条件下生成的一系列钼化合物对光有很好的吸收作用,有利于提高保护渣消光系数,降低铸坯与结晶器之间辐射热流密度。通过DSC、XRD和SEM-EDS等方法研究表明,在无氟保护渣中加入一定量的三氧化钼和碳能够使保护渣的形核过程由表面形核变为体形核,同时促进硅酸钙晶体的析出。
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Effect of MoO3 and C on radiative heat transfer and crystallization performance of fluoride free mold fluxes
Abstract:In continuous casting process, mold fluxes are important for heat transfer and lubrication between billet and mould. The effects of molybdenum trioxide and carbon on fluorine-free mold fluxes\' radiative heat transfer and crystallization properties were studied in this paper. The transmissivity of mold fluxes can be measured by ultraviolet-visible-near infrared spectrophotometer. The change of transmittance curve showed that molybdenum compounds formed by molybdenum trioxide and carbon at high temperature can effectively absorb light. The molybdenum compounds can improve the extinction coefficient of mould fluxes and reduce the radiation heat flux between slab and mould. The results of DSC, XRD and SEM-EDS showed that the addition of molybdenum trioxide and carbon in fluorine-free mold fluxes can change the nucleation mode from surface nucleation into body nucleation and can promote the precipitation of calcium silicate crystals.
Keywords: Fluorine-free mold flux Radiation heat transfer Transmittance Crystallization
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MoO3和C对无氟保护渣辐射传热及结晶影响
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