Effects of glass on densification and interfacial bonding of LTCC co-fired Ag electrode

A cylindrical indenter was designed to simulate the roller and 304 stainless steel / Q235A carbon steel plate with different roughness were bonded together. The interfacial bonding behavior was investigated by SEM, ultrasonic “C” scanning detection and nanoindentation test. The result reveal that with the increase of contact pressure between interfaces, the atoms of dissimilar metals begin to diffuse across interfaces in some regions, then form island-like bonding regions, and eventually extend to the whole interface. There are no obvious cracks on the surface of stainless steel and carbon steel after deformation. The cold roll-bonding mechanism of stainless steel and carbon steel is that elements on both sides of the interface diffuse and form a shallow diffusion layer under pressure to ensure the joint strength, and the joint bonding strength is greater than the strength of carbon steel matrix. In addition, the surface morphology of base metal has a great influence on the interfacial bonding quality. The higher surface roughness values increases the hardening degree of rough peak, which makes real contact area difficult to increase and reduce the interfacial bonding quality.

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Interfacial bonding effect on nonlinear magnetoelectric response of multiferroic composites

Mechanics of Materials ◽

10.1016/j.mechmat.2020.103660 ◽

2021 ◽

Vol 153 ◽

pp. 103660

Author(s):

Zhi Ming Hu ◽

Jackie Li

Keyword(s):

Interfacial Bonding ◽

Bonding Effect ◽

Magnetoelectric Response

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Effect of interfacial bonding on dislocation strengthening in graphene nanosheet reinforced iron composite: A molecular dynamics study

Computational Materials Science ◽

10.1016/j.commatsci.2021.110309 ◽

2021 ◽

Vol 191 ◽

pp. 110309

Author(s):

Lu Wang ◽

Jianfeng Jin ◽

Peijun Yang ◽

Shaojie Li ◽

Shuai Tang ◽

...

Keyword(s):

Molecular Dynamics ◽

Interfacial Bonding ◽

Graphene Nanosheet ◽

Dislocation Strengthening

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Vacancy-mediated effects for simultaneously enhancing the Cu/graphene/Al interfacial bonding strength and thermal conductance: a first-principles study

Journal of Materials Science ◽

10.1007/s10853-020-05624-0 ◽

2021 ◽

Vol 56 (9) ◽

pp. 5697-5707

Author(s):

Pei Liu ◽

Jingpei Xie ◽

Ruiyao Hei ◽

Aiqin Wang ◽

Douqin Ma ◽

...

Keyword(s):

First Principles ◽

Bonding Strength ◽

Thermal Conductance ◽

Interfacial Bonding ◽

First Principles Study ◽

Mediated Effects ◽

Interfacial Bonding Strength

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Interfacial Strengthening of Graphene/Aluminum Composites through Point Defects: A First-Principles Study

Nanomaterials ◽

10.3390/nano11030738 ◽

2021 ◽

Vol 11 (3) ◽

pp. 738

Author(s):

Xin Zhang ◽

Shaoqing Wang

Keyword(s):

Mechanical Properties ◽

Metal Matrix Composites ◽

Point Defects ◽

Metal Matrix ◽

Interfacial Bonding ◽

Theoretical Research ◽

Matrix Composites ◽

Aluminum Composites ◽

Single Vacancy ◽

Design Guideline

The relationship between point defects and mechanical properties has not been fully understood yet from a theoretical perspective. This study systematically investigated how the Stone–Wales (SW) defect, the single vacancy (SV), and the double vacancy (DV) affect the mechanical properties of graphene/aluminum composites. The interfacial bonding energies containing the SW and DV defects were about twice that of the pristine graphene. Surprisingly, the interfacial bonding energy of the composites with single vacancy was almost four times that of without defect in graphene. These results indicate that point defects enhance the interfacial bonding strength significantly and thus improve the mechanical properties of graphene/aluminum composites, especially the SV defect. The differential charge density elucidates that the formation of strong Al–C covalent bonds at the defects is the most fundamental reason for improving the mechanical properties of graphene/aluminum composites. The theoretical research results show the defective graphene as the reinforcing phase is more promising to be used in the metal matrix composites, which will provide a novel design guideline for graphene reinforced metal matrix composites. Furthermore, the sp3-hybridized C dangling bonds increase the chemical activity of the SV graphene, making it possible for the SV graphene/aluminum composites to be used in the catalysis field.

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