Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Dong, Duo; Zhu, Dongdong; Wang, Ye; Wang, Gang; Wu, Peng; He, Qing

doi:10.3390/met8110896

Cited by 8 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Phase B contained 24.13% Ni, 5.54% Cr, 7.51% Fe, 1.09% Ag, 10.78% Cu and 50.95% Ti. The ratio of Ti to Ni is about 2:1, which would be regarded as Ti 2 Ni phase [24,25]. Phase C incorporating 95.74% Cu, which is determined to be Cu(s, s).…”

Section: Microstructure Of the Gh4169/si 3 N 4 Jointsmentioning

confidence: 99%

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

et al. 2022

View full text Add to dashboard Cite

GH4169 superalloy and Si3N4 ceramics were vacuum-brazed with AgCuTi+Cu foam composite filler. The effect of brazing temperature on the microstructure and mechanical properties of the GH4169/Si3N4 joint was studied. The results show that the interface microstructure of the GH4169/Si3N4 joint is the GH4169 superalloy/TiCu+Ti2Ni+TiCu2+Ag(s, s)+TiCu4+Cu(s, s)+TiN+Ti5Si3/Si3N4 ceramics. With the increase in brazing temperature, the element diffusion between the base metal and the brazing filler intensifies, and the interfacial reaction layer thickens, which is conducive to the improvement of shear strength. At 850 °C, the maximum shear strength of the joint is 196.85 MPa. After further increases in the brazing temperature, Cu foam dissolves completely, and the Ti-Cu intermetallic compounds increase, which is harmful to the shear strength due to the increases in the brittle phase. However, when the brazing temperature reaches 910 °C, the shear strength of the brazing joint slightly increases under the combined effect of the Ti-Cu intermetallic compounds and the thickness of the reaction layer.

show abstract

Section: Microstructure Of the Gh4169/si 3 N 4 Jointsmentioning

confidence: 99%

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The commercial active brazing fillers used are often based on the Ag-Cu eutectic, with small additions of Ti which acts as an active element. However, joints resulting from brazing with Ag-based fillers usually present extensive segregation of (Ag) at the center of the interface [19], which limits the service temperature of joints to around 350 • C [20].…”

Section: Introductionmentioning

confidence: 99%

Joining Alumina to Titanium Alloys Using Ag-Cu Sputter-Coated Ti Brazing Filler

et al. 2020

View full text Add to dashboard Cite

The joining of alumina (Al2O3) to γ-TiAl and Ti6Al4V alloys, using Ag-Cu sputter-coated Ti brazing filler foil, was investigated. Brazing experiments were performed at 980 °C for 30 min in vacuum. The microstructure and chemical composition of the brazed interfaces were analyzed by scanning electron microscopy and by energy dispersive X-ray spectroscopy, respectively. A microstructural characterization of joints revealed that sound multilayered interfaces were produced using this novel brazing filler. Both interfaces are composed mainly of α-Ti, along with Ti2(Ag,Cu) and TiAg intermetallics. In the case of the brazing of γ-TiAl alloys, α2-Ti3Al and γ-TiAl intermetallics are also detected at the interface. Bonding to Al2O3 is promoted by the formation of a quite hard Ti-rich layer, which may reach a hardness up to 1872 HV 0.01 and is possibly composed of a mixture of α-Ti and Ti oxides. Hardness distribution maps indicate that no segregation of either soft or brittle phases occurs at the central regions of the interfaces or near the base Ti alloys. In addition, a smooth hardness transition was established between the interface of Al2O3 to either γ-TiAl or Ti6Al4V alloys.

show abstract

“…So far, the TiAl alloys have been welded via several methods, such as fusion joining [4,5], diffusion bonding [6][7][8] and brazing [9][10][11][12]. Among them, brazing is considered as an effective and superior method thanks to its convenience, low cost and high-quality brazed joints in the metal-ceramic connection technologies.…”

Section: Introductionmentioning

confidence: 99%

Effect of brazing temperature on microstructure and mechanical properties of TiAl/ZrB2 joint brazed with CuTiZrNi filler

Wang

Yang

et al. 2019

Journal of Manufacturing Processes

Self Cite

View full text Add to dashboard Cite

The TiAl alloy and ZrB2-SiC ceramic are promising materials used at high temperatures. One route to extend their unique applications under extreme conditions relies on successful brazing them together with proper fillers. In this work, brazing temperature influences on microstructural, mechanical, and fractural properties were systemically studied for brazed joints after brazing the TiAl to the ZrB2-SiC with amorphous CuTiZrNi fillers. An optimized brazing was found at 1183 K for 1200 s, yielding a high shear strength of 187 MPa. The joints were mainly consisted of AlCuTi, Ti2Al, (Ti,Zr)2(Cu,Ni), TiB,TiB2, TiCu Ti5Si3, and TiC phases. Brazing temperature substantially changed joint composites. It is found that lower temperature lead to insufficient reaction and remained filler and higher ones to large stress-induced microcracks. Based on element diffusion, a formation mechanism of brazed joint was also proposed.

show abstract

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Cited by 8 publications

References 27 publications

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

Joining Alumina to Titanium Alloys Using Ag-Cu Sputter-Coated Ti Brazing Filler

Effect of brazing temperature on microstructure and mechanical properties of TiAl/ZrB2 joint brazed with CuTiZrNi filler

Contact Info

Product

Resources

About