ZnO陶瓷/金属Cu钎焊接头残余应力计算  

Calculation on Residual Stress of ZnO Ceramic / Copper Brazed Joints

作　　者：刘宇阳[1] 王星明[1] 白雪[1] 李思钦 孙静[1] 石志霞[1] 

机构地区：[1]北京有色金属研究总院稀有金属冶金材料研究所,北京100088

出　　处：《稀有金属》2015年第11期1004-1009,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51171029)资助

摘　　要：采用热弹塑性有限元分析方法,计算了方形ZnO陶瓷与金属Cu钎焊接头中残余应力的大小和分布。发现结果如下:ZnO陶瓷与金属Cu钎焊后会在接头中产生残余应力,其中ZnO陶瓷侧垂直于钎焊界面方向的轴向拉应力是影响ZnO/Cu接头性能的主要因素,轴向拉应力的最大值出现在ZnO陶瓷表面边缘靠近钎焊界面处,当钎料层厚度为0.3 mm时,拉应力在ZnO陶瓷表面边缘距ZnO/钎料层界面0.6 mm处有最大值69.75 MPa。通过钎料层不同厚度的比较计算得出,合适的钎料层厚度能降低ZnO/Cu接头的残余应力,钎料层厚度为0.1 mm时,ZnO陶瓷侧拉应力峰值最小,为30.82 MPa。此外,采用单一缺陷模型计算了钎料层中气孔缺陷的存在对ZnO陶瓷与金属Cu钎焊接头残余应力的影响。计算结果显示,气孔缺陷位于ZnO/钎料层界面时残余拉应力峰值为95.5 MPa,气孔缺陷位于Cu/钎料层界面时残余拉应力峰值为107.2 MPa,拉应力峰值相对无缺陷模型均有大幅升高。Using thermal elastic plastic finite element method, the size and the distribution of residual stress in square ZnO ceramic/ copper brazed joints were calculated. The results showed that residual stress existed in ZnO ceramic/copper brazed joints. The axial tensile stress of ZnO ceramic perpendicular to the brazed interface was the dominating factor that affects the performance of ZnO/Cu joints. The maximum axial tensile stress appeared at the edge of ZnO ceramic surface near the brazing interface. When the thickness of the filler metal was 0.3 mm, the maximum value of tensile stress （69.75 MPa） appeared at the edge of ZnO ceramic surface, 0. 6 mm away from the ZnO/brazing interface. Comparison and calculation of brazing filler with different thicknesses showed that suitable filler metal thickness could reduce the residual stress of ZnO/Cu joints. Optimal thickness of the filler metal was 0.1 mm, while the peak tensile stress at ZnO ceramic side got a minimum value of 30.82 MPa. In addition, the influence of porosity defect at filler metal layers on residual stress of ZnO/Cu joints was studied using a single defect model. The simulation results showed that the maximum residual tensile stresses of ZnO/Cu joints were 95.5 and 107.2 MPa, respectively, when porosity defect existed in ZnO/In and Cu/In interface. Besides, the presence of porosity defect at filler metal layers caused a dramatic rise of tensile stress peak value. Key words： ZnO ceramic; copper; residual stress; finite element method

关 键 词：ZnO陶瓷 铜 残余应力 有限元分析方法 

分 类 号：TG404[金属学及工艺—焊接]