摘要
使用 Ag-Cu-Ti 合金粉、SiC 粉和 Zr 粉组成的混合粉末钎料,真空无压钎焊再结晶 SiC 陶瓷与 Ti 合金,观察 Zr 加入前后接头连接层组织结构的变化,研究了 Zr 的作用．结果表明,Zr 加入前,连接层主要由 Ag、SiC、Cu-Ti、Ti_3SiC_2、和 Ti-Si 相组成．Zr 加入后,连接层主要由 SiC、Ti_(1-x)C、Ti-Si、AgTi 和 AgCu_4Zr 相组成．Zr 的加入提高了连接层中 Ti 的活度,使 SiC 颗粒表面反应层 Ti_3SiC_2转变,生成了 Ti_(1-x)C 和 Ti-Si 相；提高了 Ti 与 SiC 颗粒的反应速度,使 SiC 颗粒减少；促进 Ti 与 Ag 的反应,生成了 AgTi．Zr 的加入导致连接层流动性的改善、连接层与 SiC 陶瓷界面结合强度的提高和接头热应力的降低,适量 Zr 的加入使接头剪切强度明显提高(达23．6MPa)．
T The recrystallized SiC ceramic was brazed to Ti-alloy with no pressure by using the mixed powder of alloying Ag-Cu-Ti, SiC and Zr powders as interlayer. The influence of the addition of Zr on the microstructure of the joining layer was investigated. Before Zr addition the joining layer mainly consists of Ag phase, Cu-Ti, Ti3SiC2 and Ti-Si phases. After Zr addition the joining layer mainly consists of Ti1-xC, Ti-Si, AgTi and AgCuaZr phases. The activity of Ti in the joining layer is enhanced by the Zr addition, resulting in the transition of Ti3SiC2 into Ti1-xC and Ti-Si phases, increase of the reaction speed of Ti with SiC, decrease of SiC particles and formation of AgTi phase; Zr addition improves the fluidity of the joining layer, increases the bond strengths of the joining layer to SiC ceramic particles, decreases thermal stress in joint and increases the joint strength to 23.5 MPa.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第2期176-180,共5页
Chinese Journal of Materials Research
基金
武器装备预研基金51418050503QT0203
高等学校博士学科点专项科研基金~~
