摘要
采用Cu_(39.37)Ti_(32.19)Zr_(19.38)Ni_(9.06)(原子比)非晶态钎料对ZrB_2-SiC超高温陶瓷进行钎焊。通过X射线衍射、扫描电镜、万能试验机对钎料的微观结构以及钎焊接头形貌、析出相和室温力学性能进行系统分析。结果表明:在一定钎焊温度下,随钎焊时间的增加,接头剪切强度逐渐减小,且伴随裂纹的出现。在钎焊温度1183 K,钎焊时间30 min时获得的剪切强度最高,约为160 MPa。润湿性实验表明该非晶钎料在ZrB_2-SiC陶瓷表面的润湿性良好。接头剪切强度与钎料和母材之间的反应层厚度有关,通过计算得出反应层厚度形成的激活能Q和反应层生长速度A_0,建立了反应层生长规律的表达式。
Two pieces of ZrB_2-SiC ultra-high temperature ceramic（UHTC）,were jointed by blazing with a novel flux of amorphous Cu_（39.37）Ti_（32.19）Zr（I9.38）Ni（9.06）（at%） foil.The impact of the blazing conditions,including the brazing temperature and time,thickness and contents of reaction layer,on the microstructures,interface adhesion,shear strength,and wettability was investigated with X-ray diffraction,scanning electron microscopy and conventional mechanical probes.The results show that at a given brazing temperature,the brazing time and reaction layer thickness significantly affect the brazing.For example,as the brazing time increased,the shear strength at the joint decreased,accompanied by emerging cracks;blazed at 1183 K for 30 min,the highest shear strength at the interface reached160 MPa,depending strongly on the reaction layer diickness;and the liquid brazing-flux displayed excellent wettability on ZrB_2-SiC surfaces.In addition,the activation energy Q and growth rate of the reaction layer were theoretically evaluated to understand the blazing mechanism.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2016年第4期465-470,共6页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金资助(11402003)
安徽省自然科学基金资助(1508085SQE210)
