Detonation Nanodiamond Seeding Technique for Nucleation Enhancement of CVD Diamond – Some Experimental Insights

Mallik, Asok K.; Mendes, Joana Catarina; Rotter, Shlomo; Bysakh, Sandip

doi:10.14355/acse.2014.03.005

Cited by 17 publications

(16 citation statements)

References 30 publications

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“…In dry environment W11 and W13 samples show comparatively almost similar COF values, although the roughness of W13 sample was higher than W11 and also its quality (figure 1) was much inferior. Mallik et al [48] observed that Si is present in the intergranular region, as well as Si may be bonded with carbon atoms present on the PCD backside. In effect, the nucleation side of W11 is not a pure diamond, rather it is a microstructure with agglomerated nano-crystalline diamond having many non-diamond phases present (more detailed elemental analysis is done in sub-section 3.2d).…”

Section: 2a Wear and Friction Datamentioning

confidence: 99%

Severe wear behaviour of alumina balls sliding against diamond ceramic coatings

et al. 2016

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At present alumina is the most widely used bio-ceramic material for implants. However, diamond surface offers very good solid lubricant for different machinery, equipment including biomedical implants (hip implants, knee implants, etc.), since the coefficient of friction (COF) of diamond is lower than alumina. In this tribological study, alumina ball was chosen as the counter body material to show better performance of the polycrystalline diamond (PCD) coatings in biomedical load-bearing applications. Wear and friction data were recorded for microwave plasma chemical vapour deposition (MWCVD) grown PCD coatings of four different types, out of which two samples were as-deposited coatings, one was chemo-mechanically polished and the other diamond sample was made free standing by wet-chemical etching of the silicon wafer. The coefficient of friction of the MWCVD grown PCD against Al 2 O 3 ball under dry ambient condition was found in the range of 0.29-0.7, but in the presence of simulated body fluid, the COF reduces significantly, in the range of 0.03-0.36. The samples were then characterized by Raman spectroscopy for their quality, by coherence scanning profilometer for surface roughness and by electron microscopy for their microstructural properties. Alumina balls worn out (14.2 × 10 −1 mm 3 ) very rapidly with zero wear for diamond ceramic coatings. Since the generation of wear particle is the main problem for load-bearing prosthetic joints, it was concluded that the PCD material can potentially replace existing alumina bio-ceramic for their better tribological properties.

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Section: 2a Wear and Friction Datamentioning

confidence: 99%

Severe wear behaviour of alumina balls sliding against diamond ceramic coatings

et al. 2016

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“…3.1 Physical characterisations-DND seed particle size, PCD crystallinity, porosity, growth defects and thermal stability Detonation nanodiamond (DND) suspension in dimethyl sulfoxide (DMSO) by 0.5 wt% is used as seeding slurry for CVD growth of polycrystalline diamond material [118]. Nucleation density determines the faster grain coalescence phenomenon during chemical vapour deposition.…”

Section: Resultsmentioning

confidence: 99%

“…In order to explain this apparent anomaly, it was necessary to know the hardness of Si 3 N 4 from commercial supplier's database and it was found to be 10-12 GPa. Such comparable hardness values of diamond nucleation surface and Si 3 N 4 counterbody might have caused nanodiamonds that are present in loosely held colonies [118] on the nucleation side to come out under abrasive wear action of silicon nitride. Such nanodiamonds that come out from the soft nucleation side under abrasive wear action may cause the Si 3 N 4 counterbody to further wear out severely, since nanodiamonds are very hard particles.…”

Section: Tribological Propertiesmentioning

confidence: 99%

Some Aspects of Diamonds in Scientific Research and High Technology

Lipatov¹

2020

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The electrical properties of diamond are significantly affected by the charge of the surface states of the sample. Depending on the type of chemisorbed elements, the electronic affinity of the diamond surface is changeable [36, 37]. The detection of negative electron affinity of the diamond surface (downward bending of zones, the absence of a potential barrier) determined the studies on the creation of cold cathodes and electron emitters based on diamond coatings [38].Due to the strong covalent bonds, diamond is a chemically inert material and is suitable for medical and biotechnological applications [10]. In this case, such diamond properties as low cost of nanoparticles, the possibility of surface activation by photochemical methods, high photoluminescence yield and its resistance to photobleaching, low cytotoxicity, and, as a consequence, environmental safety are used.The collection of scientific chapters proposed to the reader reflects some of the aspects, mentioned above. This collection will be useful to students, graduate students, and researchers who are interested in such disciplines as the synthesis of carbon and superhard materials, carbon electronics and photonics, surface chemistry, etc.

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“…Detonation nanodiamond (DND) suspension in dimethyl sulfoxide (DMSO) by 0.5 wt% is used as seeding slurry for CVD growth of polycrystalline diamond material [118]. Nucleation density determines the faster grain coalescence phenomenon during chemical vapour deposition.…”

Section: Physical Characterisations-dnd Seed Particle Size Pcd Crystallinity Porosity Growth Defects and Thermal Stabilitymentioning

confidence: 99%

Polycrystalline Diamond Characterisations for High End Technologies

Mallik¹

2020

Some Aspects of Diamonds in Scientific Research and High Technology

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Characterisations of polycrystalline diamond (PCD) coatings have routinely been done over the past three decades of diamond research, but there is less number of reports on some of its very unique properties. For example, diamond is the hardest known material and, in probing such hard surfaces with any indenter tip, it may lead to damage of the instrument. Due to such chances of experimental accidents, researchers have performed very few attempts in evaluating the mechanical properties of PCDs. In the present work, some of these very special properties of diamond that are less reported in the literature are being re-investigated. PCDs were characterised by photoluminescence (PL), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscope (TEM), and X-ray diffraction (XRD) techniques. The diamond surface was also polished to bring the as-grown micron level of surface roughness (detrimental for wear application) down to few hundreds of nanometer. The tribological properties of such polished and smooth surfaces were found to be appropriate for wear protective coating application. This chapter revisits some of the unreported issues in the synthesis and characterisation of PCD coatings grown on Si wafer by the innovative 915 MHz microwave plasma chemical vapour deposition (MPCVD) technique.

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Detonation Nanodiamond Seeding Technique for Nucleation Enhancement of CVD Diamond – Some Experimental Insights

Cited by 17 publications

References 30 publications

Severe wear behaviour of alumina balls sliding against diamond ceramic coatings

Severe wear behaviour of alumina balls sliding against diamond ceramic coatings

Some Aspects of Diamonds in Scientific Research and High Technology

Polycrystalline Diamond Characterisations for High End Technologies

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