Interface evolution and bond strength when diffusion bonding materials with stable oxide films

2001 ◽  
Vol 31 (7) ◽  
pp. 609-618 ◽  
Author(s):  
A. A. Shirzadi ◽  
H. Assadi ◽  
E. R. Wallach
Keyword(s):  
Bond Strength ◽  
Diffusion Bonding ◽  
Oxide Films ◽  
Interface Evolution ◽  
Stable Oxide

Formation of stable oxide films on the surface of chromium-nickel steel in a coolant based on N2O4

1981 ◽  
Vol 51 (5) ◽  
pp. 733-735
Author(s):  
A. G. Akimov ◽  
A. N. Khodan ◽  
V. N. Vechkanov ◽  
V. S. Zotikov ◽  
P. P. Stanishevskii ◽  
...  
Keyword(s):  
Oxide Films ◽  
Nickel Steel ◽  
Stable Oxide

Comparison of Nickel Nanoparticle-Assisted Diffusion Brazing of Stainless Steel to Conventional Diffusion Brazing and Bonding Processes

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
S. K. Tiwari ◽  
B. K. Paul
Keyword(s):  
Stainless Steel ◽  
Bond Strength ◽  
Diffusion Bonding ◽  
Transient Liquid Phase ◽  
Bond Line ◽  
Scanning Electron Micrographs ◽  
Secondary Phases ◽  
Bonding Pressure ◽  
Nickel Nanoparticle ◽  
Diffusion Brazing

Transient liquid phase diffusion brazing is used in precision, hermetic joining applications as a replacement for diffusion bonding to reduce cycle times, reduce bonding pressure, and improve yields. In the present study, stainless steel 316L laminae are diffusion brazed with an interlayer of nickel nanoparticles and compared with samples joined by conventional diffusion bonding and electroplated nickel-phosphorous diffusion brazing. Comparison is made with regard to microstructural evolution, diffusional profile, and bond strength. All bonding was carried out in a uni-axial vacuum hot press at 1000°C with a heating rate of 10°C/min, a dwell time of 2 h and a bonding pressure of 10 MPa. Bond strength measurements show that the sample brazed with a nickel nanoparticle interlayer has the lowest void fraction at 4.8±0.9% and highest shear strength at 141.3±7.0 MPa. Wavelength dispersive spectroscopic analysis of sample cross-sections shows substantial diffusion of Ni and Fe across the nickel nanoparticle bond line. Scanning electron micrographs show no secondary phases along the nickel nanoparticle bond line.

Diffusion bonding of nickel and zirconia: Mechanical properties and interfacial microstructures

1992 ◽  
Vol 7 (6) ◽  
pp. 1480-1488 ◽  
Author(s):  
C-D. Qin ◽  
B. Derby
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Bond Strength ◽  
Grain Boundaries ◽  
Oxide Layer ◽  
Diffusion Bonding ◽  
Bonding Interface ◽  
Subsequent Annealing ◽  
Bending Tests ◽  
Diffusion Bonds

Diffusion bonds of Ni/ZrO2 and Ni/NiO/ZrO2 fabricated in vacuum have been investigated using flexural 4-point bending tests and optical and electron microscopy. It is found that subsequent annealing in air after bonding improves bond strength, and annealing in vacuum reduces strength. This is attributed to the formation of a thin oxide layer during annealing in air which enhances adhesion to the ceramic, whereas annealing in vacuum creates debonding voids at the specimen edges. The transformation of NiO in vacuum to Ni explains why the strength of bonds using preoxidized Ni foil does not show any increase, as it is essentially still the diffusion bonding of Ni to ZrO2 in the configuration of Ni/NiO/Ni/ZrO2. The presence of extensive void necklaces on grain boundaries in the metal where they intersect the bonding interface shows the importance of the metal grain boundaries acting as vacancy sinks during diffusion bonding.

scholarly journals Gallium-assisted diffusion bonding of stainless steel to titanium; microstructural evolution and bond strength

Materialia ◽  
2018 ◽  
Vol 4 ◽  
pp. 115-126 ◽  
Author(s):  
Amir A. Shirzadi ◽  
Arijit Laik ◽  
Raghvendra Tewari ◽  
Jonathan Orsborn ◽  
Gautam K. Dey
Keyword(s):  
Stainless Steel ◽  
Bond Strength ◽  
Microstructural Evolution ◽  
Diffusion Bonding

scholarly journals Effects of Copper Surface Oxidation and Reduction on Shear-Bond Strength Using Functional Monomers

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1753
Author(s):  
Haruto Hiraba ◽  
Hiroyasu Koizumi ◽  
Akihisa Kodaira ◽  
Kosuke Takehana ◽  
Takayuki Yoneyama ◽  
...  
Keyword(s):  
Bond Strength ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Shear Bond Strength ◽  
Oxide Films ◽  
Surface Oxidation ◽  
Acrylic Resin ◽  
Copper Surface ◽  
Dihydrogen Phosphate ◽  
Functional Monomers

This study was conducted to clarify the influence of the copper surface oxidation and reduction on the shear-bond strength with functional monomers. Unheated copper specimens (UH; n = 88) were wet-ground. Three-quarters of the UH were then heated (HT). Two-thirds of the HT was then immersed in a hydrochloric acid solution (AC). Half of the AC was then reheated (RH). Each group was further divided into two groups (n = 11), which were primed by either 6-methacryloyloxyhexyl 2-thiouracil-5-carboxylate (MTU-6) or 10-methacryloyloxydecyl dihydrogen phosphate (MDP). The shear-bond strength tests were used for bonding with an acrylic resin. The surface roughness values and chemical states of the four groups were analyzed using a confocal scanning laser microscope and X-ray photoelectron spectroscopy (XPS). The shear-bond strengths of HT and RH were the lowest in the MTU-6-primed groups. The result of AC was significantly lower than others in the MDP-primed groups. The XPS results showed that the surfaces of UH and AC consisted of Cu2O and Cu. The surface changed to CuO upon heating. The presence or absence of copper-oxide films showed the opposite trends in the effectiveness of MTU-6 and MDP to improve bond strength. The results could elucidate the effects of functional monomers on copper-oxide films.

Interface microstructure and bond strength of 1420/7B04 composite sheets prepared by diffusion bonding

Rare Metals ◽  
2018 ◽  
Vol 37 (7) ◽  
pp. 613-620 ◽  
Author(s):  
Fan Wu ◽  
Wen-Long Zhou ◽  
Bing Zhao ◽  
Hong-Liang Hou
Keyword(s):  
Bond Strength ◽  
Diffusion Bonding ◽  
Interface Microstructure

Resolving Crystallites in Zirconium Oxide Films

1969 ◽  
Vol 27 ◽  
pp. 140-141
Author(s):  
R.A. Ploc
Keyword(s):  
Electron Microscope ◽  
Inelastic Scattering ◽  
Zirconium Oxide ◽  
Oxide Films ◽  
Optic Axis ◽  
Objective Lens ◽  
Microscope Objective ◽  
Linear Optic ◽  
A Current ◽  
Microscope Objective Lens

The optic axis of an electron microscope objective lens is usually assumed to be straight and co-linear with the mechanical center. No reason exists to assume such perfection and, indeed, simple reasoning suggests that it is a complicated curve. A current centered objective lens with a non-linear optic axis when used in conjunction with other lenses, leads to serious image errors if the nature of the specimen is such as to produce intense inelastic scattering.

Analysis of Sputtered Zinc Oxide Films

1980 ◽  
Vol 38 ◽  
pp. 416-417
Author(s):  
T. A. Emma ◽  
M. P. Singh
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Piezoelectric Materials ◽  
Oxide Films ◽  
Optical Quality ◽  
Zno Films ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Sputtered Films ◽  
Zinc Oxide Films

Optical quality zinc oxide films have been characterized using reflection electron diffraction (RED), replication electron microscopy (REM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Significant microstructural differences were observed between rf sputtered films and planar magnetron rf sputtered films. Piezoelectric materials have been attractive for applications to integrated optics since they provide an active medium for signal processing. Among the desirable physical characteristics of sputtered ZnO films used for this and related applications are a highly preferred crystallographic texture and relatively smooth surfaces. It has been found that these characteristics are very sensitive to the type and condition of the substrate and to the several sputtering parameters: target, rf power, gas composition and substrate temperature.

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