Microstructure evolution of diamond with molybdenum coating and thermal conductivity of diamond/copper composites fabricated by spark plasma sintering

Li, Hongzhao; Wang, Changrui; Ding, Wei; Wu, Lianmei; Wang, Junbo; Tian, Wenxi; Hu, Junshan; Wu, Chao; Chen, Minghe; Zhang, Hao; Lin, Tiesong; Liao, Wenhe

doi:10.1007/s10854-022-08441-0

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…One of the promising metals for coating diamond crystals to be further used in the copper–diamond composites with a high thermal conductivity is molybdenum [ 10 ]. In order to deposit molybdenum-containing coatings on the diamond surface, the molten salt method [ 10 , 11 ], magnetron sputtering [ 12 ], chemical vapor deposition [ 13 ], or vacuum micro-vapor deposition can be used [ 14 ]. Recently, a new method for obtaining coatings on powder particles (crystals) based on annealing of the powder mixtures (the substrate mixed with a coating precursor) in a spark plasma sintering (SPS) facility (coating of diamond by Ti) [ 15 ] or a hot press (HP) (coating of diamond by W) [ 16 ] has been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the intrinsic differences between the {100} and {111} facets, the interactions of these facets with an external reactant may be expected to proceed differently. The effect of selective deposition of coatings on certain facets of the diamond crystals has been observed for silver [ 19 ], tungsten [ 16 ], and molybdenum [ 14 ]. As suggested in [ 16 ], oxides present on the surface of metallic particles can play a significant role in the process of the coating formation, if they are the volatile and enable the gas-phase transport of the coating precursor material to the diamond surface.…”

Section: Introductionmentioning

confidence: 99%

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Selective Deposition of Mo2C-Containing Coatings on {100} Facets of Synthetic Diamond Crystals

Ukhina

Bokhonov

Dudina

2022

IJMS

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An efficient way to improve the properties of metal–diamond composites (mechanical strength, wear resistance, thermal conductivity) is the preliminary modification of the diamond surface to improve its wettability by the metal matrix. In the present work, Mo2C-containing coatings were deposited on the diamond crystals under different conditions: hot pressing (atmosphere of argon), spark plasma sintering (forevacuum), and annealing in air. The influence of the sintering parameters on the morphology and phase composition of the coatings deposited on diamond was studied. Mo2C-containing coatings were selectively deposited on the facets of synthetic diamond microcrystals by annealing of the latter with a molybdenum powder. Experiments were carried out to deposit coatings under different conditions: during hot pressing (argon atmosphere), spark plasma sintering (forevacuum), and annealing in air. The process parameters were the temperature, holding time, and concentration of molybdenum in the initial mixture. Experiments with a pre-oxidized molybdenum powder were also conducted. The coated diamond crystals were investigated by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. The deposition was enabled by the gas phase transport of molybdenum dioxide, MoO2, contained in the starting powder. The following sequence of the coating formation stages was proposed. First, MoO2 sublimes and is adsorbed mainly on the {100} facets of diamond. Then, it is reduced to metallic molybdenum by carbon of the diamond, which further reacts with carbon to form the Mo2C carbide phase. These processes occurred during treatment of the mixtures in the hot press and the spark plasma sintering facility. When the mixture was annealed in air, no selective deposition was observed. During annealing, MoO3 particles adhered to the diamond surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective Deposition of Mo2C-Containing Coatings on {100} Facets of Synthetic Diamond Crystals

Ukhina

Bokhonov

Dudina

2022

IJMS

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Double layer interfacial structure of Cr3C2–Cr7C3 in copper/diamond composites for thermal management applications

Chen,

Wang,

Fan

et al. 2024

Applied Thermal Engineering

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Microstructure Characteristics and Tribological Properties of Gradient Cu-MoS2 Self-Lubricating Coating Fabricated by Selective Laser Melting of Ink-Printed Metal Nanoparticles

Guo¹,

Run²,

Guan³

et al. 2023

Journal of Tribology

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Self-lubricating coating has been used in industrial applications with severe conditions, such as high temperatures, vacuum, radiation, etc. In this paper, a selective laser melting based ink-printed metal nanoparticles (SLM-IP metal NPs) rapid manufacturing method was applied to fabricate Cu-MoS2 self-lubricating coating. A tailored ink consisting metal NPs, reductant and dispersant was deposited on a stainless steel substrate, forming the laminated gradient Cu-MoS2 coating. The microstructure and mechanical properties of the composite coating were characterized. The friction and wear behavior were experimentally investigated by dry sliding wear test at room and higher temperature (>200°C). The results indicated that the upper copper sulfur molybdenum compounds layer with homogeneously distributed MoS2 provided a significant friction reduction and wear resistance. The SLM-IP Cu-MoS2 coatings showed reduced friction coefficient by 54% compare to the pure Cu coating. The transitional Cu layer mitigated the abrupt changes in physical properties and enhanced the bonding strength between the coating and substrate. Especially, under the test condition of 200°C, the Cu-40 vol% MoS2 coating also presented an excellent resistance to oxidation and had a lower friction coefficient of 0.24. This research provided a feasibility of fabricating self-lubricating coatings by the SLM-IP metal NPs method for surface engineering technologies.

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Microstructure evolution of diamond with molybdenum coating and thermal conductivity of diamond/copper composites fabricated by spark plasma sintering

Cited by 4 publications

References 42 publications

Selective Deposition of Mo2C-Containing Coatings on {100} Facets of Synthetic Diamond Crystals

Selective Deposition of Mo2C-Containing Coatings on {100} Facets of Synthetic Diamond Crystals

Double layer interfacial structure of Cr3C2–Cr7C3 in copper/diamond composites for thermal management applications

Microstructure Characteristics and Tribological Properties of Gradient Cu-MoS2 Self-Lubricating Coating Fabricated by Selective Laser Melting of Ink-Printed Metal Nanoparticles

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