摘要
由于陶瓷的线膨胀系数与金属的线膨胀系数相差很大,因此在通过焊接连接陶瓷与金属时,热作用势必会在接头区域会产生幅值较大的残余应力,进而降低接头的力学性能,严重时甚至会导致连接陶瓷接头的断裂。这使得陶瓷与金属的连接是一个广受关注但又未能得到很好解决的科学问题。采用非晶钎料实现ZrO2陶瓷与Ti-6Al-4V合金的钎焊连接,研究焊接工艺参数对接头的组织与性能的影响。结果表明接头界面组织结构为ZrO2陶瓷/Cu2Ti4O+(Ti,Zr)2Cu/TiO+Ti2O/CuTi2+(Ti,Zr)2Cu/CuTi2/Ti-6Al-4V合金。钎焊温度、保温时间和冷却速度对界面组织结构有最大的影响,主要体现在反应层的厚度和脆性(Ti,Zr)2Cu相的变化。接头的剪切强度随钎焊温度、加热时间和冷却速度的增加而降低。最佳工艺参数为焊温度1 173 K,保温时间10 min,冷却速度5 K/min,其钎焊接头剪切强度可以达到165 MPa。
Because difference of the linear thermal expansion coefficient of ceramic and metal, when ceramic and metal is joined there is a mass of the residual stress in the joint, which leads to decrease the strength. The joining of ceramic and metal is attention subject. In this composition, ceramic ZrO2 and metallic Ti-6A1-4V alloy are jointed by using a amorphous Ti33ZrlTCUs0 （at.%） solder. The microstructure and the properties of the joint are investigated. The results show that the microstructure and mechanical properties are significantly influenced by the brazing temperature, the heat time and the cooling rate. The brazing seam is composed of ZrO2/Cu2Ti40＋（Ti,Zr）2Cu/TiO＋Ti20/CuTi2＋（Ti,Zr）2Cu/CuTi2/Ti-6A1-4V alloy. The shear strength of the joint decreases as the brazing temperature, the heat time the cooling rate increase. The maximum shear strength of the brazing joints reaches 165 MPa with the optimal technical parameters： The brazing temperature of 1 173 K, the heat time of 10 min and the cooling rate of 5 K/min.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第22期121-127,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(10972122
11102099)
高等学校博士学科点专项科研基金(20090002110082)
中国博士后基金
清华大学汽车安全与节能国家重点实验室自主科研课题(ZZ2011-112)资助项目
