A Cu–Pd–V System Filler Alloy for Silicon Nitride Ceramic Joining and the Interfacial Reactions

Abstract

A Cu–Pd–V brazing alloy with the composition of Cu–(38.0~42.0)Pd–(7.0~10.0)V (in wt.%) was designed as a filler for joining Si3N4. Its wettability on Si3N4 ceramic was measured with the sessile drop method. It was shown that the Cu–Pd–V alloy gave a contact angle of 71° at 1473 K. The filler alloy was fabricated into foils with a thickness of 0.15 mm. The Si3N4–Si3N4 joints brazed at 1443 K for 10 min exhibit average three‐point bend strength of 263 MPa at room temperature, and the joint strengths at 973 K and 1073 K are 277 MPa and 218 MPa, respectively. The analysis results of SEM, XRD, and TEM for the brazed joint indicate the presence of V2N at the surface of the Si3N4. The increase of the thickness of V2N reaction layer obeyed parabolic law, and the parabolic rate constant (k) can be described as k = 2.8739 × 10−9 exp(−162989.4/RT) m2/s. Pd2Si and Cu3Pd compounds as well as (Cu, Pd) solid solution were detected in the central part of the joints. The presence of (Cu, Pd) phases and especially refractory Pd2Si compounds within the joints should contribute to the stable high‐temperature property. The interfacial reaction mechanisms were discussed.

Microstructure and Property of AlN Joint Brazed with Au–Pd–Co–Ni–V Brazing Filler

“…Xiong et al [15] studied the reaction mechanism of Si 3 N 4 /Au38.0ePd28.0eCo18.0eNi7.0eV9.0/ Si 3 N 4 joint and detected that V 2 N formed at the interface close to Si 3 N 4 . Moreover, they also detected V 2 N in Si 3 N 4 /Si 3 N 4 joint brazed with a CuePdeV brazing alloy [20] . Therefore, in the present work, together with the ratio of V and N in microzone "4" (Table 1), it is deduced that the VeN compound should be V 2 N. The reaction for the formation of V 2 N at the interface can be expressed by the following equation:…”

Analysis of the brazing joints of tubular zirconia ceramics and 06Cr19Ni10 stainless steel tubes

“…Assembly clearance has a large impact on the reliability of the sleeve joint, where there is a certain contradiction with the uneven thickness of the metalised surface. Many effective solutions have been proposed to solve this problem, such as: solid phase diffusion bonding [10,11], partial transient liquid phase bonding [12], active brazing[13,14] and so on. Among them, active brazing has excellent adaptability in the shape and size of the joint and his process is also fairly simple, which is an attractive industrial application technology [15].…”

Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler

“…Brazing, owing to its simplicity and low cost, is suitable and widely used to join ceramics . Surface wettability plays an important role in brazing ceramics.…”