添加Zn对AgCu钎料在TiC金属陶瓷表面润湿性的影响

分别采用AgCu共晶钎料和AgCu共晶钎料中添加30%(质量分数)Zn的AgCuZn钎料在TiC金属陶瓷表面进行润湿试验.结果表明,Zn元素的添加显著改善了钎料在TiC金属陶瓷表面的润湿性;AgCu钎料润湿TiC金属陶瓷时,从近钎料外表面到钎料/陶瓷界面,组织依次为Ag(s.s)+Cu(s.s)/(Cu,Ni)+Ag(s.s)/TiC金属陶瓷+Ag(s.s)+Cu(s.s)/TiC金属陶瓷;而采用AgCuZn钎料润湿TiC金属陶瓷后,从近钎料外表面到钎料/陶瓷界面,组织依次为Ag(s.s)+Cu(s.s)+(Cu,Ni)/Ag(s.s)+Cu(s.s)/(Cu,Ni)/TiC金属陶瓷+Ag(s.s)+Cu(s.s)/TiC金属陶瓷.Zn元素在真空中挥发促进了界面处Ni原子的溶解和扩散,使钎料在陶瓷表面的润湿角由120.6°减小到33.9°.

Influence of Zn addition on wettability of AgCu brazing alloy on TiC cermet

Wetting experiments of AgCu eutectic brazing alloy and AgCuZn brazing alloy with 30wt.% Zn addition were performed on TiC cermet.Based on observation of wetting angles of the two brazing alloys on the cermet and interfacial microstructure,it is found that wettability of brazing alloy on TiC cermet is greatly improved by Zn addition.When AgCu brazing alloy was adopted,the microstructure was Ag(s.s)+Cu(s.s)/(Cu,Ni)+Ag(s.s)/TiC cermet+Ag(s.s)+Cu(s.s)/TiC cermet from the near exterior surface of the alloy to the cermet.However,when Zn was added into AgCu brazing alloy,the microstructure was Ag(s.s)+Cu(s.s)+(Cu,Ni)/Ag(s.s)+Cu(s.s)/(Cu,Ni)/TiC cermet+Ag(s.s)+Cu(s.s)/TiC cermet.And it''s shown that evaporation of Zn in the vacuum improves dissolution and diffusion of Ni at the interface and the wetting angle of the brazing alloy on the cermet decreases from 120.6° to 33.9°.