The Strength of Vacuum-Free Diffusion Bonding Joints of Ni-Bi Alloys and ZrO2 Ceramic

2010 ◽  
Vol 160-162 ◽  
pp. 231-234
Author(s):  
Hou Hong Pan ◽  
Ke Jun Wang ◽  
Isao Itoh
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Nickel Alloy ◽  
Diffusion Bonding ◽  
Bonding Strength ◽  
Room Temperature ◽  
Shear Fracture ◽  
Pure Nickel ◽  
Fracture Test ◽  
Free Diffusion

Ni-Bi alloys were selected to bond to ZrO2 ceramic by diffusion bonding at atmosphere for researching their bondability. The Ni-Bi alloys were Ni-xmass%Bi (x=0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0) and ZrO2 ceramic was Z201N. The bonding was carried out at 973 K, 1037 K and 1173 K for 3.6 ks, 5.4 ks, 7.2 ks, 9.0 ks and10.8 ks under the pressure of 2 MPa, 4 MPa, 6 MPa, 8 MPa, 10 MPa and 12 MPa. The bonding strength was examined by the shear fracture test from room temperature to high temperature. The results indicate that pure nickel could be bonded to ZrO2. Adding bismuth into nickel alloy could obviously improved shear strength at room temperature. The optimum content of bismuth was 2%. The shear strength of vacuum-free diffusion bonding joint was higher than that of vacuum diffusion bonding joint. ZrO2/Ni-2Bi joint was bonded at 1173 K for 7.2 ks under 8 MPa, which shear strength was up to 22 MPa until the test temperature of 873 K.

Diffusion Bonding of ZrB2 Ceramic and Al-Sn-Mg Alloys at Atmosphere

2011 ◽  
Vol 189-193 ◽  
pp. 3249-3252
Author(s):  
Hou Hong Pan ◽  
Keigo Iijima ◽  
Yong Jun Liu ◽  
Isao Itoh
Keyword(s):  
Shear Strength ◽  
Fracture Surface ◽  
Diffusion Bonding ◽  
Bonding Strength ◽  
Shear Fracture ◽  
Bonding Interface ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Fracture Test

Diffusion bonding of ZrB2 ceramic and Al-Sn-Mg alloys was carried out at atmosphere. The Al-Sn-Mg alloys were Al-xmass%Sn-ymass%Mg (x=0, 0.5, 1.0, 2.0; y=0, 0.5, 1.0, 2.0). ZrB2 ceramic was fine ZrB2 type. The bonding conditions were 873K for 3.6ks, 7.2ks and 14.4ks under the pressure of 1MPa, 2MPa and 4MPa. The microstructures of the bonding interface and the shear fracture surface were investigated by SEM and EPMA. The bonding strength was examined with the shear fracture test. The results show that ZrB2 ceramic could be joined to Al-Sn-Mg alloy with diffusion bonding. “Al-Sn” alloy can be used as an interlayer for diffusion bonding of ZrB2 ceramic. And the optimum “Al-Sn” alloy is Al-0.5Sn-0.5Mg. Shear strength of 42~44 MPa can been obtained for ZrB2/Al-0.5Sn-0.5Mg joint bonded at 873 K for 7.2 ks, 14.4 ks under 2 MPa, 4 MPa.

High Temperature Bonding Effect of the Room-Temperature-Curing Phosphate Adhesive for C/C Composites

2016 ◽  
Vol 680 ◽  
pp. 179-183 ◽  
Author(s):  
Ming Chao Wang ◽  
Meng Meng Zhuang ◽  
Xin Tao ◽  
Xi Qing Xu ◽  
Hai Tao Geng ◽  
...  
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Thermal Cycling ◽  
Bonding Strength ◽  
Room Temperature ◽  
Temperature Range ◽  
Heat Resistant ◽  
Bonding Effect ◽  
Temperature Shear

A heat-resistant phosphate adhesive was developed for joining and repairing of C/C composites. The high-temperature bonding effect for both cured adhesive and 1300°C-calcined adhesive had been evaluated through testing high-temperature shear strength of corresponding joints. The results showed that the bonding strength of cured adhesive decreased from 7.9 MPa at RT to 0.9 MPa at 1300°C, while that of 1300°C-calcined adhesive could maintain about 4 MPa at temperature range from RT to 700°C and then decreased to 1.7 MPa at 1300°C. Besides, with the increasing thermal cycling times at 1300°C, the high-temperature bonding strength at this temperature could maintain at about 2.3 MPa.

scholarly journals Shear strength behaviour of sand-bentonite mixtures with pumice additivite under high temperature

2020 ◽  
Vol 205 ◽  
pp. 04004
Author(s):  
Esra Güneri ◽  
Yeliz Yükselen Aksoy
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Room Temperature ◽  
Engineering Properties ◽  
Direct Shear ◽  
Test Results ◽  
Soil Behavior ◽  
Shear Tests ◽  
Volume Deformation ◽  
Direct Shear Tests

Depending on increase in the number and type of energy geostructures, studies on the change in soil behavior against heat increase becomes more important. The engineering properties such as permeability, volume deformation of surrounding soils around energy structures mustn’t alter in the presence of heat and thermal cycles. Pumice is a material used in many fields especially for thermal insulation. For that reason, pumice can be used for increasing the resistance of soils in the presence of heat. In this study, the shear strength behavior of sand-bentonite mixtures was investigated with pumice additive under high temperature. In the experiments, 10% and 20% pumice were added to 10% and 20% sand-bentonite mixtures and compaction, direct shear tests were conducted. The direct shear tests were performed both room temperature and under 80°C. The results have shown that the pumice additive increased the shear strength of sand-bentonite mixtures under high temperature when compared the test results under room temperature.

Microstructure and Mechanical Performance of Diffusion Bonding Joints of 316L Ss with Ni Interlayer

2013 ◽  
Vol 631-632 ◽  
pp. 254-259
Author(s):  
Zi Liang An ◽  
Fu Zhen Xuan ◽  
Shan Tung Tu
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Diffusion Bonding ◽  
Room Temperature ◽  
Mechanical Performance ◽  
Testing Temperature ◽  
Uniaxial Pressure ◽  
High Temperature Strength ◽  
Ni Interlayer ◽  
High Temperature Tensile

The diffusion bonding of 316L stainless steel with Ni interlayer in the temperature range of 850-1050°C, under a uniaxial pressure 10 MPa for 60 min is investigated. The diffusion bonds have been evaluated light microscopy, SEM, X-ray diffraction and tensile test. The main result is that the introduction of the interlayer may reduce the room temperature strength but increase the high temperature strength. This is attributed to the transformation of Fe0.64Ni0.36 formed in bonding process into FeNi3 at high temperature. Kirkendall voids are formed in the Ni interlayer near the interface where the specimen fractured. Fractographic study indicates that the fracture mode of the joints is strongly affected by the bonding and testing temperature. The fracture is a mixed mode of brittle and ductile fracture in high temperature tensile test, while it is brittle fracture at room temperature.

Effect of B4C and SiO2 on Bond Property for Phenolic Resin-Based Adhesive

2018 ◽  
Vol 281 ◽  
pp. 959-963
Author(s):  
Feng Zhang ◽  
Chuan Qi Hu ◽  
Shi Chao Zhang ◽  
Hao Ran Sun ◽  
Yuan Tian ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Bond Strength ◽  
Boron Carbide ◽  
Bonding Strength ◽  
Heat Treatment Temperature ◽  
Room Temperature ◽  
Phenolic Resin ◽  
Optical Microscope ◽  
Treatment Temperature

In this paper, the modified phenolic resin-based adhesive was prepared by dissolving different components. After low temperature curing, SiC samples were bonded by the binder. The samples were treated at different temperatures (400°C, 800°C, 1200°C, 1500°C) under an inert atmosphere. The bonding strength of samples was tested after heat treatment at room temperature. The results showed that the bonding strength of the B4C modified phenolic resin (PF) based adhesive is the highest. When the heat treatment temperature was above 1200°C, the bond strength increased with the additive amount of boron carbide at room temperature. The microstructures of the samples were observed by optical microscope and scanning electron microscope. The effects of the modified filler and heat treatment temperature on the bonding strength of the phenolic resin based adhesive were investigated. The bonding strength of boron carbide-modified phenolic resin-based binder was tested under high temperature. It was found that the bond strength at high temperature was lower than that at room temperature, and the bond strength decreased with the increase of temperature.

scholarly journals Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4339
Author(s):  
Guanqiang Wang ◽  
Mingsong Chen ◽  
Yongcheng Lin ◽  
Yumin Lou ◽  
Hongbin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Fracture Mode ◽  
Room Temperature ◽  
Shear Fracture ◽  
Annealing Treatment ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Water Cooling ◽  
Gh4169 Superalloy

This study takes large size samples after hot-upsetting as research objects and aims to investigate the optimization double-stage annealing parameters for improving the mechanical properties of hot-upsetting samples. The double-stage annealing treatments and uniaxial tensile tests for hot-upsetting GH4169 superalloy were finished firstly. Then, the fracture mode was also studied. The results show that the strength of hot-upsetting GH4169 superalloy can be improved by the double-stage annealing treatment, but the effect of annealing parameters on the elongation of GH4169 alloy at high temperature and room temperature is not significant. The fracture mode of annealed samples at high-temperature and room-temperature tensile tests is a mixture of shear fracture and quasi-cleavage fracture while that of hot-upsetting sample is a shear fracture. The macroscopic expressions for the two fracture modes belong to ductile fracture. Moreover, it is also found that the improvement of strength by the double-stage annealing treatment is greater than the single-stage annealing treatment. This is because the homogeneity of grains plays an important role in the improvement of strength for GH4169 superalloy when the average grain size is similar. Based on a comprehensive consideration, the optimal annealing route is determined as 900 °C × 9–12 h(water cooling) + 980 °C × 60 min(water cooling).

Diffusion Bonding of Duplex Stainless Steel and Ti Alloy with and without Interlayer

2014 ◽  
Vol 783-786 ◽  
pp. 9-14
Author(s):  
Subrata Chatterjee ◽  
S. Kundu ◽  
S. Sam ◽  
B. Mishra
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Shear Strength ◽  
Duplex Stainless Steel ◽  
Nickel Alloy ◽  
Diffusion Bonding ◽  
Base Alloy ◽  
Intermetallic Layer ◽  
Bonding Temperature ◽  
Ti Alloy

In the present study, the microstructure and strength properties of diffusion bonded joints of duplex stainless steel (SS) to Ti alloy (TiA) with and without nickel alloy (NiA) as an intermediate material was investigated in the temperature range of 800-950°C for 60 mins in vacuum. In the case of directly bonded stainless steel and titanium alloy, the layer wise σ phase and λ+FeTi phase mixture were observed at the bond interface. However, when nickel alloy was used as an interlayer, the interfaces indicate that Ni3Ti, NiTi and NiTi2 are formed at the nickel alloy-titanium alloy interface and the stainless steel-nickel alloy interface is free from intermetallics up to 875°C and above this temperature, Fe-Ti and Fe-Cr-Ti base intermetallics were formed. The irregular shaped particles have been observed within the Ni3Ti intermetallic layer. The joint tensile and shear strength were measured; a maximum tensile strength of ~519.2MPa and shear strength of ~398.3MPa were obtained for direct bonded joint when processed at 875°C. However, when nickel base alloy was used as an interlayer in the same materials at the bonding temperature of 900°C the bond tensile and shear strength increases to ~596.5MPa and ~434.4MPa, respectively. Keywords: Diffusion bonding, intermetallic compounds, interlayer, SEM, XRD

Microstructure and Properties of Fe–Al/Cr3C2RE Composite Coating Produced by HVFS

2011 ◽  
Vol 189-193 ◽  
pp. 286-291
Author(s):  
Xiao Ming Liu ◽  
Jun Hui Dong ◽  
Run Sheng Xu
Keyword(s):  
High Temperature ◽  
Composite Coating ◽  
Bonding Strength ◽  
Room Temperature ◽  
Composite Coatings ◽  
Surface Active Agent ◽  
Active Agent ◽  
Flame Spraying ◽  
High Temperature Properties ◽  
Microstructure And Properties

Fe–Al/Cr3C2composite coatings produced from high-velocity flame spraying (HVFS) are Fe–Al intermetallic composite coatings with remarkable room-temperature and high-temperature properties. However, Fe–Al/Cr3C2composite coatings have a Cr3C2content of 50%. This causes the coatings to become porous and limits its room-temperature and high-temperature properties. In order to improve microstructure and properties of Fe–Al/Cr3C2composite coatings, Fe–Al/Cr3C2RE, including Fe–Al/Cr3C2and CeO2, is sprayed by HVFS technology onto AISI 1020 steel. The properties including bonding strength and high-temperature corrosion-resistance of Fe–Al/Cr3C2RE composite coating are tested at 25°C and 650 °C. For comparison, two other materials, substrate AISI 1020 steel and Fe–Al/Cr3C2composite coating, are tested under the same experimental conditions. The microstructures of the coatings are analyzed by scanning electronic microscopy (SEM), the cross-section morphology of Fe–Al/Cr3C2RE composite coating is analyzed by energy-dispersive spectroscopy (EDS), and the existing states of oxides are analyzed by transmission electron microscopy (TEM). The phases of the composite coating after corrosion are analyzed by X-ray diffraction (XRD). The results demonstrate that the properties of Fe–Al/Cr3C2RE composite coatings is better than that of either AISI 1020 steel or the Fe–Al/Cr3C2composite coating. CeO2is a surface-active agent, and it significantly improves the microstructure and properties of Fe–Al/Cr3C2RE composite coating. CeO2improves the bonding strength of Fe–Al/Cr3C2RE composite coating by reducing the surface tension of droplet and enhancing its fluidity as well as wetting capacity on the surface of the substrate, decreasing the internal stress of coating.Adding CeO2to the coating produces Al2O3and Cr2O3oxide films, which protect the substrate AISI 1020 steel from corrosion more efficiently.

Evaluation of High Temperature Interfacial Bonding Strength of Ti3SiC2-Al2O3 Joint in Air

2013 ◽  
Vol 544 ◽  
pp. 321-325
Author(s):  
De Tian Wan ◽  
Yi Wang Bao ◽  
Xiao Gen Liu ◽  
Yuan Tian ◽  
Run Run Li
Keyword(s):  
High Temperature ◽  
Cross Section ◽  
Bonding Strength ◽  
Room Temperature ◽  
Interfacial Bonding ◽  
Bending Stress ◽  
Interfacial Bonding Strength ◽  
Cross Section Method ◽  
Shear Bonding Strength ◽  
Bonding Surface

Ti3SiC2-Al2O3joint with strong interface has potential high temperature applications because it combines with the merits of hard ceramics and soft ceramics. The safety is strongly dependent on the interfacial bonding strength between Ti3SiC2and Al2O3. In this work, the cross-section method was suggested to evaluate the tensile and shear bonding strength for Ti3SiC2-Al2O3joint from room temperature to 800 °C in air. A novel testing fixture made of SiC was designed and machined to avoid the bending stress at the bonding surface during the testing process. It is indicated that the measured shear bonding strength is usually higher than tensile bonding strength for Ti3SiC2-Al2O3joint. Both the tensile and shear bonding strength are decreased with the increment of testing temperatures. At 800 °C, the tensile and shear bonding strength are declined to be about 43.15% and 45.02% compared with those at room temperature, relatively. The mechanism for the strong interface between Ti3SiC2and Al2O3is also discussed.

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