Interaction of diamond with ultrafine Fe powders prepared by different procedures

Chepurov, A. I.; Сонин, В. М.; Жимулев, Е. И.; Tolochko, B.P.; Eliseev, V. S.

doi:10.1134/s0020168511070077

Cited by 13 publications

(6 citation statements)

References 6 publications

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“…The interaction at the nickel/diamond interface is a key question in a variety of applications, such as epitaxial growth of diamond lms on nickel substrates, 1,2 catalytic etching of diamond surfaces, [3][4][5][6][7][8] and the design of diamond-metal composites with nickel-containing binders. [9][10][11] It is also of great interest from the fundamental point of view as the processes occurring at the nickel/diamond interface exemplify the interaction between two phases, one of which is metastable.…”

Section: Introductionmentioning

confidence: 99%

Towards a better understanding of nickel/diamond interactions: the interface formation at low temperatures

et al. 2015

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We report the formation and development of the interface between diamond and nickel in partially densified compacts obtained from powder mixtures by Spark Plasma Sintering, hot pressing and conventional sintering at 700 and 900 Ctemperatures, which are well below the melting point of nickel and even below that of the nickel-graphite eutectic. The nickel particles sintered among themselves and formed joints with facets of the diamond crystals. Most of these joints fractured cohesively leaving Ni-containing patches on the diamond facets. The microstructure of the patches adhered to the diamond surface in compacts sintered at 900 C and their geometry and orientation relative to the edges of the diamond facets suggest that the formation and development of the nickel/ diamond interface are associated with melting and solidification of the melt according to certain directions of the diamond crystalline lattice. A possible explanation of the formation of a liquid at such a low temperature is contact melting of a metastable eutectic between nickel and diamond.

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Section: Introductionmentioning

confidence: 99%

Towards a better understanding of nickel/diamond interactions: the interface formation at low temperatures

et al. 2015

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“…In order to treat the crystals, we used hydrogenation by Fe particles. This technique has already demonstrated high etching rates on other diamond types [24,[40][41][42], while the distribution of metal particles on the diamond and the characteristics of the etched surface depend mainly upon the method of preparation of the etchant [47]. Our recent study on synthetic diamond crystals confirmed that the size of the pits can be decreased significantly [26].…”

Section: Discussionmentioning

confidence: 78%

“…This process generally involves four steps: (1) diamond dissolution and incorporation of carbon atoms into the surface layer of the metallic catalyst, (2) carbon diffusion in the bulk of the metal, (3) gasification of the carbon dissolved in the metal via the formation of gaseous hydrocarbons, and (4) the removal of the gaseous carbon-containing compounds from the reaction zone [43][44][45]. The mechanism of catalytic hydrogenation of diamond is influenced by the diamond structure (crystallographic orientation of the faces on which the etching occurs), as well as the presence of defects in the form of dislocations, and the size of the catalyst particles [46,47]. After etching, the diamond crystals were cleaned in a mixture of HCl and HNO 3 to remove the metal, as well as in an oxidative mixture consisting of 10% aqueous solution of K 2 Cr 2 O 7 and concentrated H 2 SO 4 at a ratio of 1:3.…”

Section: Methodsmentioning

confidence: 99%

Surface Porosity of Natural Diamond Crystals after the Catalytic Hydrogenation

et al. 2021

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The study of diamond surfaces is traditionally undertaken in geology and materials science. As a sample material, two natural diamond crystals of type Ia were selected, and their luminescence and nitrogen state was characterized. In order to etch the surface catalytic hydrogenation was performed using Fe particles as an etchant. Micromorphology of the surface was investigated by scanning electron and laser confocal microscopy. It was demonstrated that etching occurred perpendicular to the crystal surface, with no signs of tangential etching. The average depth of caverns did not exceed 20–25 μm with a maximal depth of 40 μm. It is concluded that catalytic hydrogenation of natural type Ia diamonds is effective to produce a porous surface that can be used in composites or as a substrate material. Additionally, the comparison of results with porous microsculptures observed on natural impact diamond crystals from the Popigai astrobleme revealed a strong resemblance.

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“…1) also demonstrated the presence of narrow maxima that correspond to the diffraction on large iron particles (Fe) and iron-containing compounds, such as FeS, FeSO 4 , and FeSO 3 . It should be noted that the effects of interaction between iron particles and diamond that usually take place at high temperatures 21,22 could not be observed in the obtained run products. In samples annealed at high pressure, the X-ray line (111) of the diamond is located near the line of MgCO 3 , which does not show an anomalous broadening.…”

Section: Resultsmentioning

confidence: 86%