WETTABILITY AND INTERFACIAL REACTIONS OF Pd-Ni-(Cr,V) BASED BRAZING FILLERS ON Si3N4 CERAMIC

Acta Metall Sin

2008, Vol. 44

Issue (10): 1260-1264 DOI:

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WETTABILITY AND INTERFACIAL REACTIONS OF Pd-Ni-(Cr,V) BASED BRAZING FILLERS ON Si3N4 CERAMIC

北京航空材料研究院

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. WETTABILITY AND INTERFACIAL REACTIONS OF Pd-Ni-(Cr,V) BASED BRAZING FILLERS ON Si3N4 CERAMIC. Acta Metall Sin, 2008, 44(10): 1260-1264 .

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Abstract 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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Received: 12 September 2007

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