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

Abstract

By coating active titanium, Sn0.3Ag0.7Cu (SAC) filler wetted SiC effectively, as the contact angle decreased significantly from ~145° to ~10°. Ti3SiC2 and TiOx (x ≤ 1) reaction layers were formed at the droplet/SiC interface, leading to the reduction of contact angle. Reliable brazing of SiC was achieved using titanium deposition at 900°C for 10 minutes, and the typical interfacial microstructure of Ti‐coated SiC/SAC was SiC/TiOx + Ti3SiC2/Sn(s,s). Comparing to direct brazing, Ti–Sn compounds in the brazing seam were effectively reduced and the mechanical property of joints was dramatically improved by titanium coating. The optimal average shear strength of SiC joints reached 25.3 MPa using titanium coating‐ assisted brazing, which was ∼62% higher than that of SiC brazed joints using SAC‐Ti filler directly.

Effect of metallization temperature on brazing joints of SiC ceramics and 2219 aluminum alloy

“…Properties parameters of SiC ceramic Cu alloy on SiC ceramics by coating Ti layer on the surface of SiC. The shear strength of the joint increased by 62% compared with that of the joint brazed without coating 20. Song et al metallized SiC with 100 μm Ag-Cu-Ti foil at 980 • C/30 min, which improved the wettability of SiC and contributed to the joint shear strength of GH99 alloy and SiC ceramics to reach 26.4 MPa 21.…”

Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal

“…The shear strength of brazed joint was lower than other research, which was because SiC ceramics were manufactured by different sintering additives and synthesis process 37 . When SiC ceramics was precoated by titanium then brazed using Sn‐based alloy, the shear strength of brazed joint was 25.3 MPa, while 15.6 MPa was obtained for SiC/SiC joint brazed using Sn‐Ti‐based filler directly 38 . Compared with the above results, the shear strength of Cr‐coated SiC/AgCu/Cr‐coated SiC in this work was improved.…”

“…The brazed joints entirely fractured in SiC substrate with intergranular fracture characteristic shown in Figure 7. It is different from the joints fractured at the thick reaction layer of substrate/brazing seam interface when brazed using conventional active filler metal directly 38,39 . This shows that active element coating‐assisted brazing is a feasible method for effective bonding of ceramics.…”

Effect of interfacial microstructure evolution on the peeling strength and fracture of AMB Cu‐metalized AlN substrate

“…Available experiment results indicate that excess Ti promote the rapid formation of joints via violent interfacial reactions, increasing the formation of brittle intermetallic compounds (IMCs). [21][22][23] Pressure tends to decrease the demand for the liquid phase that prevents the formation of voids. 24,25 On the basis of these findings, we attempted to bond the AlN substrates sandwiched between copper with low Ag concentration under high pressure, which is aimed to narrowing or even eliminating the brazing seam, and efficiently utilize the active element Ti.…”

“…(A) CLSM 3D image of the fracture and profile of the marked red line; (B) SEM image of the cross-section of the fracture; and (C) Schematic of the peeling test and peeling force-displacement curveA survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD,17,18 CVI,[19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”