工程科学学报，第41卷，第1期：12-21,2019年1月 Chinese Joural of Engineering,Vol.41,No.I:12-21,January 2019 DOI:10.13374/j.issn2095-9389.2019.01.002;http://journals.ustb.edu.cn 连铸结晶器内渣膜形成及传热的研究现状 文光华四，杨昌霖，唐萍 重庆大学材料科学与工程学院，重庆400044 ☒通信作者，E-mail:wenh@cgu.cd.cm 摘要介绍了模拟结晶器内渣膜形成的实验方法，综述了国内外学者在保护渣传热方面所做的研究工作，包括固态渣膜的 界面热阻、保护渣的导热系数、辐射传热以及渣膜的光学性质，并提出了今后在渣膜形成及传热研究中有待进一步完善的内 容和方向.现有的研究结果表明利用热丝法可以对渣膜的形成过程进行原位观察，采用水冷铜探头法可以获取用于研究渣膜 微观组织的固态渣膜样品.渣膜的界面热阻在0.0002~0.002m2.KW之间.在800℃以下，保护渣的导热系数在1.0-2.0 W·m·,K范围内，且随温度的升高而逐渐增加.渣膜中的晶体一方面可以增加渣膜的界面热阻，另一方面可以提高固态渣 膜的反射率，起到降低辐射热流的作用.此外，过渡族金属氧化物的加人以及固态渣膜中弥散分布的微小颗粒也能改变渣膜 的光学性质，从而影响通过渣膜的辐射传热 关键词连铸：保护渣：渣膜：界面热阻：辐射 分类号TF777.1 Research overview of formation and heat transfer of slag film in mold during continuous casting WEN Guang-hua,YANG Chang-lin,TANG Ping College of Materials Science and Engineering,Chongqing University,Chongqing 400044.China Corresponding author,E-mail:wengh@cqu.edu.cn ABSTRACT Mold flux,which plays an important role in continuous casting,occurs when liquid slag on top of the molten steel infil- trates the gap between the shell and mold.During this process,a liquid slag film forms on the shell side,whereas a solid slag film forms on the mold side.The behavior of the slag film between the shell and mold has a significant effect on the sequence casting and quality of the slab surface.To investigate the in-mold behavior and heat transfer of slag film,researchers have simulated the formation of slag film in the laboratory.Measurements and theoretical calculations have been performed to study the heat transfer of slag film.In this paper,the experimental methods used to simulate the formation of slag film were described and the research related to heat transfer in slag film was summarized,including the interfacial thermal resistance,the thermal conductivity of the mold flux,radiative heat transfer,and optical properties of the slag film.The issues related to the formation and heat transfer of slag film were also identified, that require further investigation.The results of recent studies indicate that the hot thermocouple technique could be applied to observe the formation of slag film,and the copper-finger dig test could be used to obtain samples for investigations related to the microstructure of solid slag film.The interfacial heat resistance is reported to be between 0.0002 and 0.002 m2.K.W-.The thermal conductivity of mold flux at 800C ranges from 1.0-2.0m2.K.W,and increases with increased temperature.Crystals in the solid slag film not only increase the interfacial heat resistance,but also decrease the radiative heat flux by reducing the reflectivity of slag film.Furthermore, due to the resulting change in optical properties,the addition of transition metal oxides and fine particles dispersed in slag film may also influence the radiative heat transfer through slag film. 收稿日期：2017-12-28 基金项目：国家自然科学基金资助项目(51574050)：宝武钢铁联合研究基金资助项目(U1760103)工程科学学报,第 41 卷,第 1 期:12鄄鄄21,2019 年 1 月 Chinese Journal of Engineering, Vol. 41, No. 1: 12鄄鄄21, January 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 01. 002; http: / / journals. ustb. edu. cn 连铸结晶器内渣膜形成及传热的研究现状 文光华苣 , 杨昌霖, 唐 萍 重庆大学材料科学与工程学院, 重庆 400044 苣 通信作者, E鄄mail: wengh@ cqu. edu. cn 摘 要 介绍了模拟结晶器内渣膜形成的实验方法,综述了国内外学者在保护渣传热方面所做的研究工作,包括固态渣膜的 界面热阻、保护渣的导热系数、辐射传热以及渣膜的光学性质,并提出了今后在渣膜形成及传热研究中有待进一步完善的内 容和方向. 现有的研究结果表明利用热丝法可以对渣膜的形成过程进行原位观察,采用水冷铜探头法可以获取用于研究渣膜 微观组织的固态渣膜样品. 渣膜的界面热阻在 0郾 0002 ~ 0郾 002 m 2·K·W - 1之间. 在 800 益以下,保护渣的导热系数在 1郾 0 ~ 2郾 0 W·m - 1·K - 1范围内,且随温度的升高而逐渐增加. 渣膜中的晶体一方面可以增加渣膜的界面热阻,另一方面可以提高固态渣 膜的反射率,起到降低辐射热流的作用. 此外,过渡族金属氧化物的加入以及固态渣膜中弥散分布的微小颗粒也能改变渣膜 的光学性质,从而影响通过渣膜的辐射传热. 关键词 连铸; 保护渣; 渣膜; 界面热阻; 辐射 分类号 TF777郾 1 收稿日期: 2017鄄鄄12鄄鄄28 基金项目: 国家自然科学基金资助项目(51574050);宝武钢铁联合研究基金资助项目(U1760103) Research overview of formation and heat transfer of slag film in mold during continuous casting WEN Guang鄄hua 苣 , YANG Chang鄄lin, TANG Ping College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 苣 Corresponding author, E鄄mail: wengh@ cqu. edu. cn ABSTRACT Mold flux, which plays an important role in continuous casting, occurs when liquid slag on top of the molten steel infil鄄 trates the gap between the shell and mold. During this process, a liquid slag film forms on the shell side, whereas a solid slag film forms on the mold side. The behavior of the slag film between the shell and mold has a significant effect on the sequence casting and quality of the slab surface. To investigate the in鄄mold behavior and heat transfer of slag film, researchers have simulated the formation of slag film in the laboratory. Measurements and theoretical calculations have been performed to study the heat transfer of slag film. In this paper, the experimental methods used to simulate the formation of slag film were described and the research related to heat transfer in slag film was summarized, including the interfacial thermal resistance, the thermal conductivity of the mold flux, radiative heat transfer, and optical properties of the slag film. The issues related to the formation and heat transfer of slag film were also identified, that require further investigation. The results of recent studies indicate that the hot thermocouple technique could be applied to observe the formation of slag film, and the copper鄄finger dig test could be used to obtain samples for investigations related to the microstructure of solid slag film. The interfacial heat resistance is reported to be between 0郾 0002 and 0郾 002 m 2·K·W - 1 . The thermal conductivity of mold flux at 800 益 ranges from 1郾 0鄄鄄2郾 0 m 2·K·W - 1 , and increases with increased temperature. Crystals in the solid slag film not only increase the interfacial heat resistance, but also decrease the radiative heat flux by reducing the reflectivity of slag film. Furthermore, due to the resulting change in optical properties, the addition of transition metal oxides and fine particles dispersed in slag film may also influence the radiative heat transfer through slag film