TiO_(2)和Al_(2)O_(3)对CaO-SiO_(2)-CaF_(2)基础焊接渣系熔化特性的影响  

Effect of TiO_(2) and Al_(2)O_(3) on melting characteristics of CaOSiO_(2)-CaF_(2) base welding slag

作　　者：何磊[1,2] 王任甫 成应晋 薛钢 马晓阳 张华军 HE Lei;WANG Renfu;CHENG Yingjin;XUE Gang;MA Xiaoyang;ZHANG Huajun(Shanghai Jiao Tong University,Shanghai,200240,China;Luoyang Ship Material Research Institute,Luoyang,471023,China)

机构地区：[1]上海交通大学,上海200240 [2]中国船舶集团有限公司第七二五研究所,洛阳471023

出　　处：《焊接学报》2023年第5期7-13,61,I0003,共9页Transactions of The China Welding Institution

基　　金：国家重点研发计划项目(2022YFB4601904)。

摘　　要：研究了TiO_(2)和Al_(2)O_(3)对CaO-SiO_(2)-CaF_(2)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,TiO_(2)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;Al_(2)O_(3)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-SiO_(2)-CaF_(2)-TiO_(2)和CaO-SiO_(2)-CaF_(2)-Al_(2)O_(3)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Ca_(4)Si_(2)O_(7)F_(2)高熔点相.TiO_(2)和Al_(2)O_(3)的加入均能使硅酸盐网络结构转变成简单四面体结构的[SiO_(4)]_(4−),且含TiO_(2)渣中生成了CaTiO_(3)新相,含Al_(2)O_(3)渣中产生CaF_(2)相和少量Ca_(2)Al(Al SiO_(7))新相.发现了对渣系熔化特性影响较大的TiO_(2)和Al_(2)O_(3)含量敏感区间,对高强钢焊材配方设计具有一定参考意义.创新点:(1)从焊接熔渣的物相和微观结构角度分析了其熔化特性变化的根本原因.(2)发现船用高强钢焊材渣系的TiO_(2)和Al_(2)O_(3)含量敏感区间,为高强钢焊材产品研发提供重要技术支撑.The effects of TiO_(2) and Al_(2)O_(3) on the viscosity,melting temperature,and surface tension of CaO-SiO_(2)-CaF_(2) 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 TiO_(2) content can significantly decrease the viscosity,melting temperature,and surface tension of the welding slag,thereby improving the fluidity.With increasing Al_(2)O_(3) content,the viscosity,melting temperature,and surface tension of the welding slag increase slightly at first and then decrease markedly.The viscosity of CaO-SiO_(2)-CaF_(2)-TiO_(2) and CaO-SiO_(2)-CaF_(2)-Al_(2)O_(3) 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 Ca_(4)Si_(2)O_(7)F_(2),a high melting point phase with a silicate network structure.Adding TiO_(2) and Al_(2)O_(3) can transform the silicate network structure into[SiO_(4)]_(4−)with a simple tetrahedral structure.CaTiO_(3) forms in slag containing TiO_(2).CaF_(2) phase and a small amount of Ca_(2)Al(AlSiO_(7))form in slag containing Al_(2)O_(3).Some sensitive ranges of TiO_(2) and Al_(2)O_(3) 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.Highlights:(1)The root cause of the change of melting characteristics was analyzed from the perspective of phase and microstructure of welding slag.(2)The sensitive range of TiO_(2) and Al_(2)O_(3) content in the slag system of marine high-strength welding material was found,which provides important technical support for the research and development of high-strength welding material products.

关 键 词：焊接渣系 熔化特性 拉曼光谱 熔渣结构 

分 类 号：TG422.1[金属学及工艺—焊接]