Submicron binderless polycrystalline diamond sintering under ultra-high pressure

Lu, Jingrui; Kou, Zili; Li, Teng; Yan, Xiaozhi; Liu, Fangming; Ding, Wei; Zhang, Qiang; Zhang, Leilei; Liu, Jin; He, Duanwei

doi:10.1016/j.diamond.2017.05.011

Cited by 16 publications

(12 citation statements)

References 21 publications

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“…Graphite formation will be prominent in areas where the pressure experienced by the BDD is lower than the nominal applied pressure, due to the microstructure of the compact. 25 A surface de-graphitization treatment was applied by annealing for 5 hours at 450°C in air, 26 before polishing one side of each compact to leave a smooth surface, rms roughness ca. 100-200 nm (measured by white light interferometry, Bruker ContourGT).…”

Section: Methodsmentioning

confidence: 99%

High pressure high temperature synthesis of highly boron doped diamond microparticles and porous electrodes for electrochemical applications

Wood

Zvoriste-Walters

Munday

et al. 2021

Carbon

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Section: Methodsmentioning

confidence: 99%

High pressure high temperature synthesis of highly boron doped diamond microparticles and porous electrodes for electrochemical applications

Wood

Zvoriste-Walters

Munday

et al. 2021

Carbon

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“…Indeed, as shown in the phase diagram of carbon ( Figure 5 ), there is an important gap between the synthesis/sintering of diamonds using CVD process (low-pressure–medium-temperature, LP–MT) and those sintered by multi-anvil press (HPHT). Thus, preliminary works were made on the direct sintering of diamond objects from micrometer-grain-size diamond powders, either natural or synthetic (e.g., [ 131 , 134 ]). In this way, the energy delivered by high pressure and high temperature is only devoted to the formation of grain boundaries instead of graphite-to-diamond transition and formation of grain boundaries in the DCS process.…”

Section: Discussionmentioning

confidence: 99%

“…The first study from this lab used high-purity commercial diamond powder with initial grain size of 0.5 mm, which was substantially re-purified. Sintering at 14 GPa and up to 2000 °C has shown that temperature is very critical regarding the diamonds back transformation to graphite, even for sintering time of 1 min ( Table 2 , Figure 8 a, [ 134 , 149 ]). With this patent [ 149 ] and first study [ 134 ], mm 3 diamond pieces have been achieved with very high hardness and grain size of 170 nm, showing the milling of diamond powders during compression.…”

Section: On the Way To Catalyst-free/binderless Synthetic Diamondsmentioning

confidence: 99%

A Review of Binderless Polycrystalline Diamonds: Focus on the High-Pressure–High-Temperature Sintering Process

2022

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Nowadays, synthetic diamonds are easy to fabricate industrially, and a wide range of methods were developed during the last century. Among them, the high-pressure–high-temperature (HP–HT) process is the most used to prepare diamond compacts for cutting or drilling applications. However, these diamond compacts contain binder, limiting their mechanical and optical properties and their substantial uses. Binderless diamond compacts were synthesized more recently, and important developments were made to optimize the P–T conditions of sintering. Resulting sintered compacts had mechanical and optical properties at least equivalent to that of natural single crystal and higher than that of binder-containing sintered compacts, offering a huge potential market. However, pressure–temperature (P–T) conditions to sinter such bodies remain too high for an industrial transfer, making this the next challenge to be accomplished. This review gives an overview of natural diamond formation and the main experimental techniques that are used to synthesize and/or sinter diamond powders and compact objects. The focus of this review is the HP–HT process, especially for the synthesis and sintering of binderless diamonds. P–T conditions of the formation and exceptional properties of such objects are discussed and compared with classic binder-diamonds objects and with natural single-crystal diamonds. Finally, the question of an industrial transfer is asked and outlooks related to this are proposed.

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“…Graphite formation will be prominent in areas where the pressure experienced by the BDD is lower than the nominal applied pressure, due to the microstructure of the compact. 25 A surface de-graphitization treatment was applied by annealing for 5 hours at 450°C in air, 26 27 Each compact was then placed on a Ti/Au coated glass slide with CircuitWorks conductive silver epoxy (Chemtronics) in contact with both the slide and the Ti/Au contact and left to dry in a 60°C oven for at least one hour.…”

Section: Methodsmentioning

confidence: 99%

High Pressure High Temperature Synthesis of Highly Boron Doped Diamond Microparticles and Porous Electrodes for Electrochemical Applications

Wood¹,

Newton²,

Shkirskiy³

et al. 2020

Preprint

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High pressure high temperature (HPHT) synthesis of crystallographically well-defined boron doped diamond (BDD) microparticles, suitable for electrochemical applications and using the lowest P and T (5.5 GPa and 1200°C) growth conditions to date, is reported. This is aided through the use of a metal (Fe-Ni) carbide forming catalyst and an aluminum dibromide (AlB2) boron source. The latter also acts as a nitrogen sequester, to reduce boron-nitrogen charge compensation effects. Raman microscopy and electrochemical measurements on individual microparticles reveal they are suitably doped to be considered metallic-like and contain negligible sp2 bonded carbon. A compaction process is used to create macroscopic porous electrodes from the BDD microparticles. Voltammetric analysis of the one-electron reduction of Ru(NH3)63+ reveals large capacitive and resistive components to the current-voltage curves, originating from solution trapped within the porous material. Scanning electrochemical cell microscopy (SECCM) is employed to map the local electrochemical activity and porosity at the micron scale. These electrodes retain the advantageous properties of polycrystalline BDD grown by chemical vapor deposition, such as large aqueous solvent window and resistance to corrosion, but with the additional benefits of a high, electrochemically accessible, surface area.

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Submicron binderless polycrystalline diamond sintering under ultra-high pressure

Cited by 16 publications

References 21 publications

High pressure high temperature synthesis of highly boron doped diamond microparticles and porous electrodes for electrochemical applications

High pressure high temperature synthesis of highly boron doped diamond microparticles and porous electrodes for electrochemical applications

A Review of Binderless Polycrystalline Diamonds: Focus on the High-Pressure–High-Temperature Sintering Process

High Pressure High Temperature Synthesis of Highly Boron Doped Diamond Microparticles and Porous Electrodes for Electrochemical Applications

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