Effect of diamond surface chemistry and structure on the interfacial microstructure and properties of Al/diamond composites

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 67252-67259 ◽  
Author(s):  
Zifan Che ◽  
Jianwei Li ◽  
Luhua Wang ◽  
Yingxu Qi ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Interfacial Reaction ◽  
Interfacial Microstructure ◽  
Interfacial Bonding ◽  
Diamond Surface ◽  
Diamond Surfaces ◽  
Microstructure And Properties ◽  
Surface Chemistry And Structure

Modification of diamond surfaces affects the interfacial reaction in Al/diamond composites, which promotes the interfacial bonding and properties of the composites.

scholarly journals The Interface and Fabrication Process of Diamond/Cu Composites with Nanocoated Diamond for Heat Sink Applications

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 196
Author(s):  
Yaqiang Li ◽  
Hongyu Zhou ◽  
Chunjing Wu ◽  
Zheng Yin ◽  
Chang Liu ◽  
...  
Keyword(s):  
Heat Sink ◽  
Copper Matrix ◽  
Interfacial Bonding ◽  
Diamond Surface ◽  
Interfacial Thermal Resistance ◽  
Titanium Layer ◽  
High Tc ◽  
Interface Reactions ◽  
Diamond Particles ◽  
Measurement Results

The coefficients of thermal expansion (CTE) and thermal conductivity (TC) are important for heat sink applications, as they can minimize stress between heat sink substrates and chips and prevent failure from thermal accumulation in electronics. We investigated the interface behavior and manufacturing of diamond/Cu composites and found that they have much lower TCs than copper due to their low densities. Most defects, such as cavities, form around diamond particles, substantially decreasing the high TC of diamond reinforcements. However, the measurement results for the Cu-coated diamond/Cu composites are unsatisfactory because the nanosized copper layer on the diamond surface grew and spheroidized at elevated sintering temperatures. Realizing ideal interfacial bonding between a copper matrix and diamond particles is difficult. The TC of the 40 vol.% Ti-coated diamond/Cu composite is 475.01 W m−1 K−1, much higher than that of diamond/Cu and Cu-coated diamond/Cu composites under equivalent manufacturing conditions. The minimally grown titanium layer retained its nanosized and was consistent with the sintering temperature. Depositing a nanosized titanium layer on a diamond surface will strengthen interfacial bonding through interface reactions among the copper matrix, nanosized titanium layer and diamond particles, reducing the interfacial thermal resistance and exploiting the high TC of diamond particles, even if defects from powder metallurgy remain. These results provide an important experimental and theoretical basis for manufacturing diamond/Cu composites for heat sink applications.

The Influence of Diamond Surface Perfection on the Preferential Nucleation of SP2 Carbon During Methane Pyrolysis

1992 ◽  
Vol 280 ◽  
Author(s):  
B. Y. Lin ◽  
C. P. Beetz ◽  
D. W. Brown ◽  
B. A. Lincoln
Keyword(s):  
Natural Diamond ◽  
High Energy ◽  
Diamond Surface ◽  
Structural Defects ◽  
High Energy Electron ◽  
Diamond Surfaces ◽  
Preferential Nucleation ◽  
Cvd Diamond Film ◽  
Surface Morphologies ◽  
Methane Pyrolysis

ABSTRACTWe report a set of CH4 pyrolysis experiments in a UHV system on diamond surfaces having varying degrees of surface roughness or perfection. Scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and reflection high energy electron diffraction (RHEED) were used to examine the formation of graphite and the resulting surface morphologies. A (100) type Ha natural diamond having 3 sputtered craters on the surface was used as the substrate, sp2 carbon was formed preferentially on the structurally defective crater surfaces after ∼3×1010 L of CH4 exposure at 900°C, whereas essentially no sp2 carbon was found on the flat portions of the diamond surface. Similar experiments were also carried out on a polycrystalline CVD diamond film and sp2 carbon was formed on that surface afte ∼4×109 L of CH4 exposure at 900°C. These results indicate that structural defects on diamond surfaces are a crucial factor in the preferential nucleation of sp2 carbon during CH4 pyrolysis.

Unraveling the Surface Chemistry and Structure in Highly Active Sputtered Pt3Y Catalyst Films for the Oxygen Reduction Reaction

2019 ◽  
Vol 12 (4) ◽  
pp. 4454-4462 ◽  
Author(s):  
Rosemary Brown ◽  
Mykhailo Vorokhta ◽  
Ivan Khalakhan ◽  
Milan Dopita ◽  
Thomas Vonderach ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Highly Active ◽  
Surface Chemistry And Structure

Surface Chemistry and Structure of Purified, Ozonized, Multiwalled Carbon Nanotubes Probed by NEXAFS and Vibrational Spectroscopies

ChemPhysChem ◽  
2004 ◽  
Vol 5 (9) ◽  
pp. 1416-1422 ◽  
Author(s):  
Sarbajit Banerjee ◽  
Tirandai Hemraj-Benny ◽  
Mahalingam Balasubramanian ◽  
Daniel A. Fischer ◽  
James A. Misewich ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Vibrational Spectroscopies ◽  
Surface Chemistry And Structure

Molecular-Dynamics Simulations of Collisions of Buckminsterfullerene with Diamond Surfaces

1990 ◽  
Vol 206 ◽  
Author(s):  
R.C. Mowrey ◽  
D.W. Brenner ◽  
B.I. Dunlap ◽  
J.W. Mintmire ◽  
C.T. White
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Center Of Mass ◽  
Potential Energy Function ◽  
Diamond Surface ◽  
Many Body ◽  
Diamond Surfaces ◽  
Gas Phase Dissociation ◽  
Dynamics Simulations ◽  
Body Potential

ABSTRACTWe have performed molecular dynamics simulations using a recently developed empirical many-body potential energy function to study the collision of the C60 isomer buckmin-sterfullerene with a hydrogen-terminated diamond surface. The simulations indicate that the cluster can react with the surface and has a larger probability of gaining atoms from the surface than of losing atoms to the surface. We have investigated the dependence of the reaction probability on the initial center-of-mass translational velocity of the cluster. The structures and energy distributions of the product clusters have been determined. Both inelastically and reactively scattered clusters have large amounts of internal energy which suggests that gas-phase dissociation is likely.

scholarly journals Expanding the Scope of Diamond Surface Chemistry: Stille and Sonogashira Cross-Coupling Reactions

2017 ◽  
Vol 121 (42) ◽  
pp. 23446-23454 ◽  
Author(s):  
Jorne Raymakers ◽  
Anna Artemenko ◽  
Shannon S. Nicley ◽  
Pavla Štenclová ◽  
Alexander Kromka ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Cross Coupling ◽  
Diamond Surface ◽  
Coupling Reactions ◽  
Cross Coupling Reactions
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