采用座滴法研究了4种钎料Pd60-Ni40, PdNi-(3-6)V, PdNi-(7-15)V 和PdNi-(16-24)Cr-(6-15)V(质量分数, %)在Si3N4陶瓷上的润湿性. 结果表明, 在1250℃/30 min的真空加热条件下, 4种钎料均在Si3N4母材上润湿铺展, PdNi-(16-24)Cr-(6-15)V钎料不但润湿角小, 而且形成了无缺陷的润湿界面. 该钎料与Si3N4形成的扩散反应层中, Cr和V优先与从母材扩散出的N反应生成相应的Cr-N和V-N相;只有少量的Si参与反应生成相应的Cr-Si和V-Si相; 钎料基体区中主要是溶有少量Si的Pd-Ni固溶体以及Pd-Si和Ni-Si相. Cr相对于V更容易向界面扩散.
Abstract: The wetting behavior of Pd60-Ni40，PdNi-(3~6)V，PdNi-(7~15)V and PdNi-(16~24)Cr-(6~15)V on Si3N4 was studied by the sessile drop method. The results show that on the condition heating at 1250℃ for 30 min in vacuum, small contact angle and excellent interface are obtained using PdNi-(16~24)Cr-(6~15)V brazing filler. In the interfacial layer with this brazing filler, elements Cr and V preferentially diffused to Si3N4 and resulted in the reaction products of Cr-N phase and V-N phase. A small amount of element Si reacted with elements Cr and V and formed Cr-Si phase and V-Si phase. The matrix of filler metal was composed of Pd-Ni solid solution with some element Si, Pd-Si phase and Ni-Si phase. When the elements Cr and V were added concurrently in the brazing filler, the former diffused to the reaction layer more strongly than the latter.
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