Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa

Irifune, Tetsuo; Ueda, Chiaki; Ohshita, Shohei; Ohfuji, Hiroaki; Kunimoto, Takehiro; Shinmei, Toru

doi:10.1080/08957959.2019.1700981

Cited by 11 publications

(13 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on previous studies [10][11][12][13][14] and our present experimental results, the pressure-temperature (P-T) phase diagram of GC is shown in Fig. 1c.…”

supporting

confidence: 54%

“…The fullerene C 60 undergoes crystal-to-amorphous and amorphous-to-amorphous transitions when heated during compression and transforms into C 60 polymers with different dimensionalities as well as distinct amorphous phases before transforming into diamond 8,9 . Likewise, GC undergoes amorphous-to-amorphous and amorphous-to-diamond transitions under different pressure and temperature conditions [10][11][12][13][14][15] . This is because carbon has a complex energy landscape, and metastable phases with local energy minima may be formed due to a preferable kinetic transformation.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Ultrastrong conductive in situ composite composed of nanodiamond incoherently embedded in disordered multilayer graphene

Wang

et al. 2022

Nat. Mater.

View full text Add to dashboard Cite

Traditional ceramics or metals cannot simultaneously achieve ultrahigh strength and high electrical conductivity. The elemental carbon can form a variety of allotropes with entirely different physical properties, providing versatility for tuning mechanical and electrical properties in a wide range. Here, by precisely controlling the extent of transformation of amorphous carbon into diamond within a narrow temperature–pressure range, we synthesize an in situ composite consisting of ultrafine nanodiamond homogeneously dispersed in disordered multilayer graphene with incoherent interfaces, which demonstrates a Knoop hardness of up to ~53 GPa, a compressive strength of up to ~54 GPa and an electrical conductivity of 670–1,240 S m–1 at room temperature. With atomically resolving interface structures and molecular dynamics simulations, we reveal that amorphous carbon transforms into diamond through a nucleation process via a local rearrangement of carbon atoms and diffusion-driven growth, different from the transformation of graphite into diamond. The complex bonding between the diamond-like and graphite-like components greatly improves the mechanical properties of the composite. This superhard, ultrastrong, conductive elemental carbon composite has comprehensive properties that are superior to those of the known conductive ceramics and C/C composites. The intermediate hybridization state at the interfaces also provides insights into the amorphous-to-crystalline phase transition of carbon.

show abstract

“…Based on previous studies [10][11][12][13][14] and our present experimental results, the pressure-temperature (P-T) phase diagram of GC is shown in Fig. 1c.…”

supporting

confidence: 54%

mentioning

confidence: 99%

Ultrastrong conductive in situ composite composed of nanodiamond incoherently embedded in disordered multilayer graphene

Wang

et al. 2022

Nat. Mater.

View full text Add to dashboard Cite

show abstract

“…However, TEM observations did not show the presence of lamellar as in diamonds obtained from graphite (first bullet of this section, [ 123 ]). Finally, a recent study based exclusively on GC constrained grain size evolution of NPD as a function of P–T conditions and discussed related mechanical properties [ 140 ]. It was shown that full transformation temperature increases from 1700 to 1900 °C with the increasing of pressure, from 15 to 25 GPa ( Table 2 , Figure 8 b).…”

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

confidence: 99%

“…References: ( a ) [ 5 ], Irifune et al, 2003; [ 56 ], Bundy, 1963; [ 102 ], Irifune et al, 2014; [ 110 ], Naka et al, 1976; [ 122 ], Sumiya et al, 2004; [ 123 ], Sumiya & Irifune, 2007; [ 124 ], Sumiya & Irifune, 2008; [ 125 ], Le Guillou et al, 2007; [ 126 ], Isobe et al, 2010; [ 127 ], Xu et al, 2013; [ 128 ], Sumiya, 2012; [ 129 ], Sumiya, 2017; [ 130 ], Sumiya& Harano, 2016; [ 131 ], Couvy et al, 2011; [ 132 ], Chang et al, 2014; [ 133 ], Sumiya et al, 2009. (b) [ 134 ], Lu et al, 2017; [ 135 ], Liu et al, 2018; [ 136 ], Li et al, 2020; [ 137 ], Osipov et al, 2020; [ 138 , 139 ], Dubrovinskaia et al, 2005a,b; [ 140 ], Irifune et al, 2020; [ 141 ], Merlen et al, 2009; [ 142 ], Solopova et al, 2015; [ 143 ], Dubrovinsky et al, 2012. (c) [ 144 ], Davydov et al, 2004; [ 145 ], Kawamura et al, 2020; [ 146 ], Park et al, 2020.…”

Section: Figurementioning

confidence: 99%

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

2022

View full text Add to dashboard Cite

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.

show abstract

“…The first method was jointly developed in Japan by Geodynamics Research Center (GRC) and Sumitomo Electric Industry (SEI), represented by Pr. T. Irifune and Dr. H. Sumiya, respectively, and consists of Direct Conversion Sintering (DCS) of graphite [ 46 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ] or other pure carbon sources [ 49 , 51 , 56 ] to diamond objects. In order to obtain an object of ~ 1 cm 3 , dedicated Kawaï multi-anvil press was developed [ 57 ].…”

Section: Application To Binderless Diamond Sinteringmentioning

confidence: 99%

High Pressure (HP) in Spark Plasma Sintering (SPS) Processes: Application to the Polycrystalline Diamond

2022

View full text Add to dashboard Cite

High-Pressure (HP) technology allows new possibilities of processing by Spark Plasma Synthesis (SPS). This process is mainly involved in the sintering process and for bonding, growing and reaction. High-Pressure tools combined with SPS is applied for processing polycrystalline diamond without binder (binderless PCD) in this current work. Our described innovative Ultra High Pressure Spark Plasma Sintering (UHP-SPS) equipment shows the combination of our high-pressure apparatus (Belt-type) with conventional pulse electric current generator (Fuji). Our UHP-SPS equipment allows the processing up to 6 GPa, higher pressure than HP-SPS equipment, based on a conventional SPS equipment in which a non-graphite mold (metals, ceramics, composite and hybrid) with better mechanical properties (capable of 1 GPa) than graphite. The equipment of UHP-SPS and HP-SPS elements (pistons + die) conductivity of the non-graphite mold define a Hot-Pressing process. This study presents the results showing the ability of sintering diamond powder without additives at 4–5 GPa and 1300–1400 °C for duration between 5 and 30 min. Our described UHP-SPS innovative cell design allows the consolidation of diamond particles validated by the formation of grain boundaries on two different grain size powders, i.e., 0.75–1.25 μm and 8–12 μm. The phenomena explanation is proposed by comparison with the High Pressure High Temperature (HP-HT) (Belt, toroidal-Bridgman, multi-anvils (cubic)) process conventionally used for processing binderless polycrystalline diamond (binderless PCD). It is shown that using UHP-SPS, binderless diamond can be sintered at very unexpected P-T conditions, typically ~10 GPa and 500–1000 °C lower in typical HP-HT setups. This makes UHP-SPS a promising tool for the sintering of other high-pressure materials at non-equilibrium conditions and a potential industrial transfer with low environmental fingerprints could be considered.

show abstract

Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa

Cited by 11 publications

References 27 publications

Ultrastrong conductive in situ composite composed of nanodiamond incoherently embedded in disordered multilayer graphene

Ultrastrong conductive in situ composite composed of nanodiamond incoherently embedded in disordered multilayer graphene

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

High Pressure (HP) in Spark Plasma Sintering (SPS) Processes: Application to the Polycrystalline Diamond

Contact Info

Product

Resources

About