scholarly journals Effect of Brazing Parameters on the Microstructure and Properties of SiC Ceramic Joint with Zr-Cu Filler Metal

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 93
Author(s):  
Bofang Zhou ◽  
Jinfeng Wang ◽  
Keqin Feng ◽  
Yuchen Cai ◽  
Sitan Chen
Keyword(s):  
Shear Strength ◽  
Reaction Layer ◽  
Shear Test ◽  
Filler Metal ◽  
Interface Reaction ◽  
Fracture Morphology ◽  
Holding Time ◽  
Sic Ceramic ◽  
Maximum Shear Strength ◽  
Joint Reaction

The microstructure and mechanical properties of brazing SiC ceramic with Zr-Cu filler metal under different brazing parameters (brazing temperature, holding time) were investigated. The phase of the joint reaction interface between Zr-Cu filler metal and SiC ceramic was characterized by XRD, the microstructure and fracture morphology of the brazing SiC ceramic joint were analyzed by SEM with EDS, and the strength of the joint was evaluated by compression shear test. The results show that the brazing join between SiC ceramic and Zr-Cu filler metal can be realized at the brazing temperature of 1100 °C~1300 °C, and the main products of interface reaction are ZrC and Zr2Si. The shear strength of the joint increases with the brazing temperature, and reaches the highest at 1200 °C. The thickness of interface reaction layer increases with the increase of holding time at brazing temperature of 1200 °C. Thickness of the interface reaction layer is 2.9 μm when the joint is holding for 20 min, and the maximum shear strength of the corresponding brazed SiC ceramic joint is 57 MPa.

scholarly journals Interface Behavior of Brazing between Zr-Cu Filler Metal and SiC Ceramic

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 727
Author(s):  
Bofang Zhou ◽  
Taohua Li ◽  
Hongxia Zhang ◽  
Junliang Hou
Keyword(s):  
Interfacial Reaction ◽  
Reaction Layer ◽  
Chemical Potential ◽  
Filler Metal ◽  
Diffusion Constant ◽  
Interface Reaction ◽  
Diffusion Path ◽  
Interface Behavior ◽  
Interfacial Reaction Layer ◽  
Sic Ceramic

The interface behavior of brazing between Zr-Cu filler metal and SiC ceramic was investigated. Based on the brazing experiment, the formation of brazing interface products was analyzed using OM, SEM, XRD and other methods. The stable chemical potential phase diagram was established to analyze the possible diffusion path of interface elements, and then the growth behavior of the interface reaction layer was studied by establishing relevant models. The results show that the interface reaction between the active element Zr and SiC ceramic is the main reason in the brazing process the interface products are mainly ZrC and Zr2Si and the possible diffusion path of elements in the product formation process is explained. The kinetic equation of interfacial reaction layer growth is established, and the diffusion constant (2.1479 μm·s1/2) and activation energy (42.65 kJ·mol−1) are obtained. The growth kinetics equation of interfacial reaction layer thickness with holding time at different brazing temperatures is obtained.

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

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 896 ◽  
Author(s):  
Duo Dong ◽  
Dongdong Zhu ◽  
Ye Wang ◽  
Gang Wang ◽  
Peng Wu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Reaction Layer ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Intermetallic Alloy ◽  
Filler Alloy ◽  
Vacuum Brazing ◽  
Brazed Joints ◽  
Si3n4 Ceramics ◽  
Maximum Shear Strength

Vacuum brazing of TiAl intermetallic alloy to Si3N4 ceramics was performed using Ag-28Cu (wt.%) filler alloy. The brazing joints obtained at different brazing temperatures were studied in this work. The microstructure and the shear strength were analyzed in detail. The results show that the brazed joints could be divided into three regions: AlCu2Ti reaction layer near the Ti-48Al-2Cr-2Nb alloy, a typical Ag-Cu eutectic structure and a thin continuous TiN + Ti5Si3 reaction layer near the Si3N4 ceramics. The microstructure varied as the brazing temperature was increased from 1153 K/15 min to 1193 K/15 min. The shear strength of the joints first increased as the brazing temperature increased from 1153 K to 1173 K, and then decreased. The maximum shear strength reached 105.5 MPa at 1173 K/15 min and the mechanism was discussed.

scholarly journals Microstructure and properties of ZrO2 ceramic and Ti-6A-4V alloy vacuum brazed by Ti-28Ni filler metal

2019 ◽  
Vol 91 (10) ◽  
pp. 35-41 ◽  
Author(s):  
Li Hong ◽  
Liu Xuan ◽  
Huang Haixin
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Filler Metal ◽  
Interfacial Microstructure ◽  
Holding Time ◽  
Metal Interface ◽  
Ceramic Filler ◽  
Rich Phase ◽  
Brazed Joints ◽  
Maximum Shear Strength

Reliable ceramics/metal joints have an extensive application in the aerospace and biomedical area. However, ZrO2ceramic has not been investigated systematically compared to the Si3N4and Al2O3ceramic. Therefore, successful brazing of ZrO2ceramic and Ti-6A-4V alloy was achieved by using a binary active Ti-28Ni filler metal in this paper. The effect of holding time on the microstructure of ZrO2 ceramic/filler metal interface and mechanical properties of brazed joints was investigated. The results indicated that the representative interfacial microstructure was ZrO2ceramic/Ti2O/Ni2Ti4O/Ti-rich phase/Ti2Ni+α-Ti. With the increase of holding time, the thickness of Ti-rich layer in the interface of ZrO2/Ti-6Al-4Vjoint decreased obviously due to the diffusion of Ti atoms. Substantial brittle intermetallic compounds Ti2Ni and Ni2Ti4O were formed in the joint, which were detrimental to the mechanical properties of the brazed joints. The maximum shear strength of joint was 112.7 MPa when brazed at 1060 °C for 10 min.

Diffusion Barrier Effect of Carbide Layer on Bonding Characteristics of Ti/Steel Clad

1996 ◽  
Vol 458 ◽  
Author(s):  
Y. Morizono ◽  
M. Nishida ◽  
A. Chiba
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Reaction Layer ◽  
Holding Time ◽  
Barrier Effect ◽  
Parent Materials ◽  
Prolonged Annealing ◽  
Average Shear Strength ◽  
Average Shear ◽  
Bonding Characteristics

ABSTRACTBonding characteristics and interfacial microstructures in explosively welded Ti/stainless steel clad of the as-welded and annealed states were investigated. In case of Ti/SUS430 ferritic stainless steel combination, the average shear strength of an as-welded clad was 555 MPa, and metastable phases such as amorphous and fine crystalline phases were observed at the interface. These were considered to be the trace of melting and subsequently rapid solidification at the contact surface of both the parent materials. By annealing below 1173 K, the strength gradually decreased with increasing holding time. The average shear strength of the clad annealed at 1073 K for 360 ks was 242 MPa, while that of the clad annealed at 1273 K abruptly decreased down to 107 MPa with increasing holding time up to 360 ks. The reaction layer formed at the interface consisted only of TiC in the former. On the other hand, the coexistence of TiC, TiFe, TiFe2 and χ was observed at the interface in the latter. The TiC in the former was considered to serve as a barrier for diffusion of Ti, Fe and Cr across the interface and to suppress the formation of intermetallic compounds. As a result, the growth of reaction layer was inhibited and high bonding strength was preserved even after prolonged annealing. The results of the Combination of Ti and SUS304 austenitic stainless steel were also discussed.

Shear Strength and Fracture Behavior of SiCw/Al2O3 Composite-Carbon Steel Brazed Joints

2005 ◽  
Vol 297-300 ◽  
pp. 2441-2446 ◽  
Author(s):  
Shi Yao Qu ◽  
Zeng Da Zou ◽  
Xin Hong Wang
Keyword(s):  
Shear Strength ◽  
Carbon Steel ◽  
Reaction Layer ◽  
Fracture Behavior ◽  
Filler Metal ◽  
Testing Machine ◽  
Al2o3 Composite ◽  
Close Relationship ◽  
Brazed Joints ◽  
Composite Carbon

Shear strength and fracture behavior of Al2O3 matrix ceramic composite brazed joints to carbon steel with Ag-Cu-Ti brazing alloy in flow argon have been studied by means of SEM, EDX and all-purpose testing machine. Results have shown that there is a close relationship between the shear strength and the fracture form of brazed joints. The fracture occurring completely in the composite near the composite/filler metal interface corresponds to the low strength of a joint, and the strength of the joint fractured partially in the composite usually increases with decreasing the proportion of the composite on the fracture surface in the steel side. When the fracture occurs in the reaction layer between the composite and the filler metal, the closer the fractured position comes to the composite/reaction layer interface, the higher the joint strength. The maximum shear strength is obtained when the fracture occurs fully at the interface.

Vacuum Brazing of Aluminum Metal Matrix Composites (70 Vol.% SiCp/Al) Using Al-15Cu-8.5Si-4Ni-1.5Mg Filler Metal

2014 ◽  
Vol 633-634 ◽  
pp. 760-763
Author(s):  
Juan Li ◽  
Ke Hong Wang
Keyword(s):  
Filler Metal ◽  
Eutectic Silicon ◽  
Primary Silicon ◽  
Holding Time ◽  
Matrix Composites ◽  
Metallurgical Bonding ◽  
Brazed Joint ◽  
Aluminum Metal Matrix Composites ◽  
Maximum Shear Strength

This work aims at brazing 70 vol.% SiCp/Al composites using Al-15Cu-8.5Si-4Ni-1.5Mg alloy powder as filler metal. The microstructures and shear strengths of the joints made with 70 vol. % SiCp/Al composites at different brazing temperature and different holding time were examined. It is found that the brazing temperature has an apparent effect on the quality of the joints. The sample brazed at 580 °C, with the holding time of 90 min demonstrates the best metallurgical bonding. The joint mainly contains α-phase, flake-like eutectic silicon, small amounts of primary silicon and bright white θ (Al2Cu) phase. The maximum shear strength of the brazed joint is 49.7MPa, and the fracture surface shows the characteristic of brittle fracture.

scholarly journals Improvement for Interfacial Microstructure and Mechanical Properties of Ti3SiC2/Cu Joint Brazed by Ag-Cu-Ti Filler with Copper Mesh

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 401
Author(s):  
Haiyan Chen ◽  
Xin Nai ◽  
Shuai Zhao ◽  
Decai Lu ◽  
Zhikang Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Coefficient Of Thermal Expansion ◽  
Interfacial Microstructure ◽  
Holding Time ◽  
Interface Microstructure ◽  
Microstructure And Mechanical Properties ◽  
The Difference ◽  
Maximum Shear Strength ◽  
Copper Mesh

Ti3SiC2 ceramic and copper were successfully vacuum brazed using Ag-Cu-Ti filler and Ag-Cu-Ti filler with copper mesh, respectively. In this study, the effects of copper mesh and brazing parameters on the interface microstructure and mechanical properties of the joints were systematically studied. The results revealed that the typical interfacial microstructure of joint was Ti3SiC2 ceramic/Ti5Si3 + TiC + Ti2Cu + Ti3Cu/Ag (s, s) + Cu (s, s)/eutectic Ag-Cu + TiSiCu/Cu. A maximum shear strength of joint obtained at a brazing temperature of 870 °C and a holding time of 10 min can reached up to 66.3 ± 1.2 MPa, which was 34.7% higher than that without copper mesh. The improvement of mechanical property was attributed to the extraordinary plasticity of copper mesh, which reduced the residual stress caused by the difference in the coefficient of thermal expansion at the interface of joints. As the brazing temperature and holding time further increased, the shear strength of joints decreased due to the excessively thick reaction layer of intermetallic compounds.

scholarly journals Characterization of SiC Ceramic Joints Brazed Using Au–Ni–Pd–Ti High-Temperature Filler Alloy

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 931
Author(s):  
Huamin He ◽  
Chuanyang Lu ◽  
Yanming He ◽  
Wenjian Zheng ◽  
Jianguo Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Reaction Layer ◽  
Thermal Stresses ◽  
Fracture Morphology ◽  
Filler Alloy ◽  
Soaking Time ◽  
Sic Ceramics ◽  
Joint Fracture ◽  
Sic Ceramic

In this work, (Au79Ni17Pd4)96Ti4 (wt.%) filler alloy was designed and employed to join SiC ceramics. The effects of brazing temperature and soaking time on the microstructure and fracture morphology of joints were investigated. The results show that the joint obtained can be described as SiC/reaction layer/braze/reaction layer/SiC. The reaction layer was composed of TiC and Au (Si, Ti). The wettability of the filler alloy toward the SiC ceramics was analyzed. The braze zone was mainly constituted by Pd2Si, Ni2Si, and Au (Ni, Si). A large number of nano-sized TiC particles were distributed within the Au (Ni, Si) layer. The formation mechanism of the braze containing different phases was discussed. The brazing temperature and soaking time had a significant effect on the reaction layer at the SiC/braze interface and TiC particles within the Au (Ni, Si) layer, while they showed a negligible effect on the Pd2Si and Ni2Si within the braze. The inherent reason was also clarified in detail. The joint fractography indicated that a good bonding was achieved between the filler alloy and SiC, while joint fracture was primarily induced by the thermal stresses residing after the brazing cycle.

scholarly journals COMPARISON OF FAILURE CRITERIA FOR WOOD IN TENSILE-SHEAR STRESS STATE

2017 ◽  
Vol 13 ◽  
pp. 115 ◽  
Author(s):  
Eliška Šmídová ◽  
Petr Kabele
Keyword(s):  
Shear Strength ◽  
Pseudotsuga Menziesii ◽  
Shear Test ◽  
Failure Criteria ◽  
Shear Loading ◽  
Douglas Fir ◽  
Picea Sitchensis ◽  
Tensile Shear ◽  
Hill Criterion ◽  
Maximum Shear Strength

An orthotropic failure criterion enhancing the Lourenco's criterion by a shear strength multiplier and a maximum shear strength upper bound has been recently proposed and validated for timber under tensile and shear loading by the authors. The paper discusses its applicability for predicting strength in comparison with Tsai-Hill criterion, Hankinson's and Hyperbolic formula applying the two above mentioned enhancements of the Lourenco's criterion. Experimental data available in the literature for off-axis tensile and shear test of Sitka spruce (Picea sitchensis Carr.), Katsura (Cercidiphyllurn japonicurn Sieb. and Zucc.), Douglas fir (Pseudotsuga menziesii), Douglas fir laminated veneer and Cupiúba (Goupia glabra) are used for the purpose of this study.

scholarly journals Vacuum Brazing of C/C Composite and TiAl Intermetallic Alloy Using BNi-2 Brazing Filler Metal

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1844
Author(s):  
Shengnan Li ◽  
Dong Du ◽  
Lei Zhang ◽  
Qingle Hao ◽  
Weimin Long
Keyword(s):  
Shear Strength ◽  
Intermetallic Compound ◽  
Filler Metal ◽  
Holding Time ◽  
Joint Shear Strength ◽  
Vacuum Brazing ◽  
Tial Intermetallic Compound ◽  
Brazed Joint ◽  
Temperature Shear ◽  
Perfect Interface

C/C composite was brazed to TiAl intermetallic compound using a commercial BNi-2 brazing filler metal under vacuum brazing condition. The brazing temperature was 1030~1150 °C and the holding time was 20 min. The joint interfacial microstructures and mechanical properties were studied, and the fracture behavior and joining mechanism were also investigated. The effect of brazing temperature on the joint shear strength was explored. The results showed that a perfect interface joint can be obtained by using BNi-2 to braze C/C and TiAl. During brazing, Ti, Cr, and other carbide forming elements diffused to C/C composite side, forming Cr3C2, Cr7C3, TiC, and other carbides, and realizing metallurgical joining between the brazing filler metal and C/C composite. The microstructure of the interface of C/C composite and TiAl intermetallic compound joint is as follows: TiAl alloy → TiAl + AlNi3 → AlNi2Ti → Ni(s, s) + Ti3Al + Ni3Si → Ni(s, s) + Ni3(Si, B) + CrB → Ni(s, s) + Ni3Si + TiCr2 → (Ti, Cr)C → C/C composite. When the holding time is fixed, with the increase of brazing temperature, the shear strength of the joint increases first and then decreases. The maximum average room temperature shear strength of the brazed joint was 11.62 MPa, while the brazing temperature was 1060 °C and the holding time was 20 min.

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