Rapid sintering of nano-diamond compacts

Osipov, A. S.; Nauyoks, S.; Żerda, T. W.; Zaporozhets, O. I.

doi:10.1016/j.diamond.2009.01.041

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…The pore size varies from 30 nm to 130 nm. There are reports of PCD sintered at 5-10 GPa and 1300-1800 ℃ during 5-60 min [52,53]. The appearance of this nanosieve structure suggests that under MPCVD growth environment, there may exist a pressure-temperature regime where diamond particles are melted/sintered, forming a granular network with open pores.…”

Section: 3 Diamond Nanostructurementioning

confidence: 99%

Property mapping of polycrystalline diamond coatings over large area

et al. 2014

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Large-area polycrystalline diamond (PCD) coatings are important for fields such as thermal management, optical windows, tribological moving mechanical assemblies, harsh chemical environments, biological sensors, etc. Microwave plasma chemical vapor deposition (MPCVD) is a standard technique to grow high-quality PCD films over large area due to the absence of contact between the reactive species and the filament or the chamber wall. However, the existence of temperature gradients during growth may compromise the desired uniformity of the final diamond coatings. In the present work, a thick PCD coating was deposited on a 100-mm silicon substrate inside a 915-MHz reactor; the temperature gradient resulted in a non-uniform diamond coating. An attempt was made to relate the local temperature variation during deposition and the different properties of the final coating. It was found that there was large instability inside the system, in terms of substrate temperature (as high as ΔT = 212 ℃), that resulted in a large dispersion of the diamond coating's final properties: residual stress (15.8 GPa to +6.2 GPa), surface morphology (octahedral pyramids with (111) planes to cubo-octahedrals with (100) flat top surfaces), thickness (190 µm to 245 µm), columnar growth of diamond (with appearance of variety of nanostructures), nucleation side hardness (17 GPa to 48 GPa), quality (Raman peak FWHM varying from 5.1 cm 1 to 12.4 cm 1 with occasional splitting). This random variation in properties over large-area PCD coating may hamper reproducible diamond growth for any meaningful technological application.

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Section: 3 Diamond Nanostructurementioning

confidence: 99%

Property mapping of polycrystalline diamond coatings over large area

et al. 2014

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“…The electrical conductivity values reported by Kidalov et al [5] are 10 -3 and 10 -1 S·cm -1 for compacts sintered at 7 GPa from microdiamond powders at 1200 °C and 1500 °C, respectively. An increase in conductivity was due to surface graphitization of the diamond particles.…”

mentioning

confidence: 92%

“…This puts forward a question whether the consolidated nanodiamonds can approach the quality of single crystal diamonds having the same size. Indeed, several studies have demonstrated attractive properties of the consolidated nanodiamonds [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…It is interesting to compare the electrical conductivity of the compacts produced in this work with those previously reported for sintered microdiamonds [5] and nanodiamond-derived powders produced by annealing. The electrical conductivity values reported by Kidalov et al [5] are 10 -3 and 10 -1 S·cm -1 for compacts sintered at 7 GPa from microdiamond powders at 1200 °C and 1500 °C, respectively.…”

mentioning

confidence: 94%

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Porous electrically conductive materials produced by Spark Plasma Sintering and hot pressing of nanodiamonds

Ukhina

Dudina

Анисимов

et al. 2015

Ceramics International

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“…The ultrasonic measurements were executed on frequencies of 10-30 MHz at T 20 1 С by automated device [23,24]. Ultrasonic velocity was measured by the time interval between trips through a zero value of identical periods (not distorted through inhomogeneity of a specimen) of high-frequency filling of the specified pair of the reflected ultrasonic radio pulses.…”

Section: Methodsmentioning

confidence: 99%

Mössbauer and Ultrasonic Study of the As-Cast High-Entropy Al$_x$CuCrCoNiFe Alloys

Надутов¹,

Zaporozhets²,

Makarenko³

et al. 2017

Metallofiz. Noveishie Tekhnol.

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Determination of the hyperfine-interaction parameters, acoustic and elastic properties of the high-entropy Al x CuCrCoNiFe alloys (HEAs) (x 1, 1.8) in the as-cast state is carried out with the use of Mössbauer spectroscopy, x-ray diffractometry and high-precision ultrasonic techniques. Wide distributions of both the hyperfine-magnetic fields on iron nuclei (5.0-36.3 T) and the isomer shifts ( 0.15-0.28 mm/s) are detected in the HEAs that is result of multiphase state and inhomogeneous short-range order in the phases. As shown, the as-cast Al x CuCrCoNiFe HEAs are acoustically and elastically inhomogeneous systems. Mean elastic moduli of the as-cast equimolar HEAs ( E 172.8 GPa, G 65.3 GPa, B 161.8 GPa) Ключевые слова: высокоэнтропийный сплав, ультразвук, упругие свой-ства, анизотропия упругости, эффект Мёссбауэра.

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Rapid sintering of nano-diamond compacts

Cited by 16 publications

References 14 publications

Property mapping of polycrystalline diamond coatings over large area

Property mapping of polycrystalline diamond coatings over large area

Porous electrically conductive materials produced by Spark Plasma Sintering and hot pressing of nanodiamonds

Mössbauer and Ultrasonic Study of the As-Cast High-Entropy Al$_x$CuCrCoNiFe Alloys

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