Pd-Ni基高温钎料对Si_3N_4陶瓷的润湿与界面连接

Wettability of Pd-Ni Based Brazing Fillers on Si_3N_4 Ceramic and Interfacial Bonding

采用座滴法研究了三种钎料Pd-Ni、PdNi-（5-14）Cr（wt％，下同）和PdNi-（15-26）Cr在Si3N4陶瓷上的润湿情况。结果表明，在1250℃／30min的真空加热条件下，随着Cr元素的加入钎料润湿性逐渐改善。Pd-Ni钎料中未加入Cr的情况下，反应层中主要是Pd参与反应，生成相应的Pd-Si等相，Ni也参与反应生成Ni-Si等相；当钎料中加入活性元素Cr以后，反应层中主要为Cr参与反应，同时生成相应的Cr-N和Cr-Si等相，另外反应层中也有一部分Ni参与反应。在PdNi-（5-14）Cr/Si3N4的界面反应层中出现了薄的黑色Cr-N层，对于Cr含量更高的PdNi-（15-26）Cr钎料，在靠近Si3N4的界面即形成Cr-N反应层。

The wetting behavior of PdNi, PdNi-（5-14）Cr and PdNi-（ 15-26 ）Cr on Si3N4 was studied by the sessile drop method. The results show that on the heating condition at 1250℃ for 30 min in vacuum, the filler metal＇s wettability of the filler metal on Si3N4 is improved by increasing the Cr content. For Pd60-Ni40 brazing filler, mainly Pd-Si and Ni-Si phases were formed as the reaction products with Si3N4. When active element Cr was added into Pd-Ni filler, Cr also participated in the interfacial reaction, that is, for PdNi-（5-14） Cr brazing filler, a black and thin Cr-N layer was visible in the reaction layer. In the case of PdNi-（15-26） Cr filler, the Cr-N layer was formed just at the interface close to the Si3N4.