Enhanced pressure-free bonding using mixture of Cu and NiO nanoparticles
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Keywords:
Non-blocking I/O
Bonding strength
Diffusion bonding
Two types of joining specimens with and without Ni foil interlayer between 316L–SS bar have been prepared by diffusion bonding in a temperature range of 850- 1050°C, under a uniaxial pressure of 10MPa for 1hours. The relationship between the bonding parameters and the tensile strength of the joints at elevated temperature was studied. Optimized processing parameters were suggested based on the testing results. It was found that the introduction of the interlayer may reduce the room temperature strength but increase the high temperature strength. This was attributed to the transformation of Fe0.64Ni0.36 formed in bonding process into FeNi3 at high temperature.
Diffusion bonding
Bonding strength
Atmospheric temperature range
Bar (unit)
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Vacuum diffusion bonding characteristics of GH4169, interface bonding holes and mechanical properties of the joints were investigated. The experimental results without interlayer showed that, with the increasing of diffusion time and diffusion pressure in the range of 950-1150°C and 20-40MPa, the number and size of interface bonding holes decreased and the maximum tensile strength of the diffusion bonding joint was 658 MPa, but the discontinuous interface holes still existed. With the Cu interlayer, interfaces between the solid solution layer and the base metal were prone to intimate contact and the maximum tensile strength of the bonding joint was 745 MPa.
Diffusion bonding
Bonding strength
Base metal
Thermocompression bonding
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The main objective of this study is to investigate the bonding strength and the microstructure of Ti/Al joints bonded by diffusion bonding method. The bonding of Ti/A1 was performed at the temperature range of 560-630℃ for 3-300min under bonding pressure of 1㎫ in vacuum atmosphere. The intermetallic compound, Al₃Ti, was found to be formed into the titanium side at the Ti/Al interface. The thickness of Al₃Ti layer was increased almost linearly with increasing bonding time up to about 10㎛. Bonding strength increased with increasing bonding time up to 60min at 600℃ The thickness of Al₃Ti layer was about 4㎛ at 600℃/60min. However, bonding strength showed a equal value(100㎫) at the bonding time range of 60-300min at 600℃. The Ti/Al joints were fractured at the interface of Al/Al₃Ti layer in all bonding conditions, no fracture was observed in Al₃Ti layer. Particularly, the Ti/Al joints bonded for more than 60min at 600℃ were fractured at the aluminium base metal. Therefore, it is considered that bonding strength was not dependent upon thickness of Al₃Ti layer(4-10㎛) because of Ti/Al joints were fractured at the interface of Al/Al₃Ti layer regardless of Al₃Ti layer thickness.
Diffusion bonding
Bonding strength
Direct bonding
Base metal
Metallic bonding
Anodic bonding
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Diffusion bonding
Cermet
Bonding strength
High-strength low-alloy steel
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Diffusion bonding
Bonding strength
Thermocompression bonding
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A new method for the bonding of metals is proposed. The method includes thermal spray coatings of a self-fluxing alloy on the bonding surfaces. The bonding of mild steels, which had been spray-coated with nickel base alloy powders, was attempted at 1253-1333 K for 60 s-10.8 ks mainly in Ar gas without any bonding pressure except the dead load of test pieces themselves. The bonding region showed satisfactory metallographic structures, but only a few pores were observed. The tensile strength of the bonded joints was over 310 MPa for an optimum bonding condition. The similar tensile strength was also obtained in the bonding atmospheres of the air and a vacuum (1.33×10−2 Pa) as well as in Ar gas. Fractures occurred mostly in the diffusion zone in the bonding region where small voids were located. It is assumed that these voids might be the unbonded spots at the initial interface between the mild steel and the spray coatings.
Diffusion bonding
Bonding strength
Anodic bonding
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In diffusion-rolling bonding, bonding temperature is a key parameter influencing interface bonding strength. In this case, lab experiments were carried out in a vacuum furnace to simulate the diffusion-rolling bonding of steel sheet of polycrystal structures under different temperatures. Bonding strength and interlayer film thickness were measured. The relationship between bonding strength and “diffused interlayer” thickness λ was investigated. The effect of temperature on diffusion-rolling bonding was investigated. Diffusion mechanism was qualitatively discussed. Based on above diffusion mechanism, the transformation in phase structure and its effect on the diffusion coefficient under different temperature was also analyzed and compared with the experimental results.
Diffusion bonding
Thermocompression bonding
Bonding strength
Anodic bonding
Diffusion welding
Atomic diffusion
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In diffusion bonding of Ti alloy to stainless steel, brittle intermetallic compounds are formed at the bond interface, therefore strength of the joints obtained by a conventional technique were extremely low.In this research, possibility to obtain high strength joints preventing the formation of intermetallic rmmnnunds by diffusion bonding in a short time were examined experimentally.As the results of the experiments, it was clarified that high strength joints of Ti alloy to stainless steel were obtained by diffusion bonding in a short time (for example, 60 s at 1023 K) of the cleaned specimens by ion bombardment with fine surface roughness.
Diffusion bonding
Brittleness
Bonding strength
Thermocompression bonding
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In this research, diffusion bonding of the intermetallic compound TiAl containing Fe, V, B and SACM645 steel was investigated. Relationships between strength characteristics and bonding parameters were analyzed. Main results obtained are as follows, (1) Direct diffusion bonding of TiAl and SACM645 was possible, high strength joints were obtained by selecting short bonding time with the bonding temperature in the range of 1223-1283K.(2) In the bonding interface, two or three inter-layers were formed as diffusion process proceeded. Decarburized layer at the steel side, Fe-Al-Ti type layer and TiC layer at the TiAl side were formed.(3) High strength joints were obtained by suppressing the formation of TiC compound in the bonding interface and by controlling total width of inter-layers within 5μm.
Diffusion bonding
Bonding strength
Thermocompression bonding
Diffusion layer
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GH4169 superalloy was bonded to itself by vacuum diffusion bonding with Ni interlayer.The effect of process parameters on the interface structure and mechanical properties of the joints was investigated.The bonding holes in the interface were used as the evaluation indicator.The experimental results without Ni interlayer show that,with the increase of heating temperature,diffusion time and diffusion pressure,the number and size of bonding holes in the interface decreased.When the bonding temperature was 1 100 ℃,the bonding time was 90 min and the pressure was 40 MPa,the diffusion holes almost disappeared,and the average tensile strength reached 658 MPa.With Ni interlayer,the briquettability of the joint was improved and the average tensile strength apparently increased.When the bonding temperature was 990 ℃,the bonding time was 75 min and the pressure was 15 MPa,the average tensile strength reached 840 MPa.
Diffusion bonding
Bonding strength
Diffusion welding
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