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何磊, 王任甫, 成应晋, 薛钢, 马晓阳, 张华军. TiO2和Al2O3对CaO-SiO2-CaF2基础焊接渣系熔化特性的影响[J]. 焊接学报, 2023, 44(5): 7-13, 61. DOI: 10.12073/j.hjxb.20220616003
引用本文: 何磊, 王任甫, 成应晋, 薛钢, 马晓阳, 张华军. TiO2和Al2O3对CaO-SiO2-CaF2基础焊接渣系熔化特性的影响[J]. 焊接学报, 2023, 44(5): 7-13, 61. DOI: 10.12073/j.hjxb.20220616003
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

TiO2和Al2O3对CaO-SiO2-CaF2基础焊接渣系熔化特性的影响

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

  • 摘要: 研究了TiO2和Al2O3对CaO-SiO2-CaF2基础焊接渣系黏度、熔化温度、表面张力等熔化特性的影响,并利用XRD和拉曼光谱分析四元焊渣的物相和结构特征. 结果表明,TiO2含量增加会显著降低焊接熔渣黏度、熔化温度及表面张力,提升熔渣流动性;Al2O3含量增加会使焊接熔渣黏度、熔化温度及表面张力先略有升高后明显降低. CaO-SiO2-CaF2-TiO2和CaO-SiO2-CaF2-Al2O3四元焊渣完全熔化后,其黏度均在0.2 Pa·s以下,继续升温对黏度无显著影响,低于熔化温度后,焊渣随温度降低迅速凝固,呈明显的短渣特性. 经XRD和拉曼光谱分析可知,四元焊接熔渣中主要含具有硅酸盐网络结构的Ca4Si2O7F2高熔点相. TiO2 和Al2O3的加入均能使硅酸盐网络结构转变成简单四面体结构的SiO44−,且含TiO2渣中生成了CaTiO3新相,含Al2O3渣中产生CaF2相和少量Ca2Al(Al SiO7)新相. 发现了对渣系熔化特性影响较大的TiO2和Al2O3含量敏感区间,对高强钢焊材配方设计具有一定参考意义.

     

    Abstract: 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 SiO44− 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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