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HE Lei, WANG Renfu, CHENG Yingjin, XUE Gang, MA Xiaoyang, ZHANG Huajun. Effect of TiO2 and Al2O3 on melting characteristics of CaO-SiO2-CaF2 base welding slag[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(5): 7-13, 61. DOI: 10.12073/j.hjxb.20220616003
Citation: HE Lei, WANG Renfu, CHENG Yingjin, XUE Gang, MA Xiaoyang, ZHANG Huajun. Effect of TiO2 and Al2O3 on melting characteristics of CaO-SiO2-CaF2 base welding slag[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(5): 7-13, 61. DOI: 10.12073/j.hjxb.20220616003

Effect of TiO2 and Al2O3 on melting characteristics of CaO-SiO2-CaF2 base welding slag

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  • Received Date: June 15, 2022
  • Available Online: April 20, 2023
  • The effects of TiO2 and Al2O3 on the viscosity, melting temperature, and surface tension of CaO-SiO2-CaF2 base welding slag were studied. The phase and structure characteristics of quaternary slag were analyzed using XRD and Raman spectroscopy. The results show that increasing the TiO2 content can significantly decrease the viscosity, melting temperature, and surface tension of the welding slag, thereby improving the fluidity. With increasing Al2O3 content, the viscosity, melting temperature, and surface tension of the welding slag increase slightly at first and then decrease markedly. The viscosity of CaO-SiO2-CaF2-TiO2 and CaO-SiO2-CaF2-Al2O3 quaternary welding slag is below 0.2 Pa·s after complete melting, with no significant effect from increasing temperature. Below the melting temperature, the slag solidifies rapidly with decreasing temperature, exhibiting obvious short-slag characteristics. XRD and Raman spectroscopy results show that the quaternary welding slag mainly contains Ca4Si2O7F2, a high melting point phase with a silicate network structure. Adding TiO2 and Al2O3 can transform the silicate network structure into [SiO4]4− with a simple tetrahedral structure. CaTiO3 forms in slag containing TiO2. CaF2 phase and a small amount of Ca2Al(AlSiO7) form in slag containing Al2O3. Some sensitive ranges of TiO2 and Al2O3 content that greatly influence the melting characteristics of slag were found. This has certain reference significance for the formulation design of high-strength welding materials.
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