Origin, state of the art and some prospects of the diamond CVD

Спицын, Б. В.; Bouilov, L.L.; Alexenko, A.E.

doi:10.1590/s0103-97332000000300002

Cited by 20 publications

(8 citation statements)

References 16 publications

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“…The transport reactions with hydrogen are very important for CVD growth of diamond and diamondlike films [10,11]. The transport reactions, involving transfer of carbon with such participants as CH 4 , CO, CO 2 , and CS 2 , can be proposed to take part in synthesis of diamonds in the carbon-carbonate [12], carbonoxalate [13], and carbon-sulfide fluid systems [14].…”

Section: Discussionmentioning

confidence: 99%

Carbon redistribution processes in nanocarbons

Кузнецов

Butenko

Zaikovskii

2004

Carbon

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Section: Discussionmentioning

confidence: 99%

Carbon redistribution processes in nanocarbons

Кузнецов

Butenko

Zaikovskii

2004

Carbon

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“…In [1] it was assumed that the decrease in the diamond UC parameter could be explained by vacancies, imperfections of vacancy type or impurity atoms with a smaller atomic weight than carbon. Later during investigation of diamond film synthesis processes it was noticed that their UC parameter values are less (0.356 64 nm [3] and 0.356 42-0.356 59 nm this work) than for type IIa diamonds.…”

Section: Introductionmentioning

confidence: 68%

“…Samples of the first group were synthesized in our laboratory from a gas environment on Si substrates without introduction of admixtures by a high-gradient chemical transport reaction method [3]. Synthesis took place at substrate temperatures from 1073 up to 1273 K and gas mixture pressures from 5.33 up to 31.99 kPa.…”

Section: Diamond Samplesmentioning

confidence: 99%

Investigation of the unit cell parameter and dislocation structure of polycrystalline diamond films

Samsonenko¹,

Samsonenko²,

Varyukhin³

et al. 2006

J. Phys.: Condens. Matter

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The values of the unit cell (UC) parameter were measured and elements of the internal structure were determined in polycrystalline diamond films (PDFs) using x-ray diffraction. It was established that the values of the UC parameter were connected with the dislocation densities in mosaic PDF crystallites. The dislocation density was calculated from measured microdistortions and dispersion in the blocks based on the surface stretch forces that arise on the boundaries between blocks. This allowed more precise computing of the dislocation density. A similar connection between the UC parameter and dislocation density also exists in epitaxial diamond films and in plastic deformed natural type IIb and Ic diamonds. A regular relationship between physical values of the UC parameter and dislocation density in mosaic diamond materials was determined using mathematical modelling. An increase in the dislocation density results in a decrease in the UC parameter from 0.356 689 nm in more pure and perfect type IIa diamonds to a limiting value of 0.356 42 nm in PDF samples.

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“…Currently, there are three sources from which diamond can be obtained: natural deposits, high pressure and high temperature techniques (HPHT), and chemical vapor deposition (CVD) [15]. This last method was the one used in this study, as it uses low pressures and low temperatures.…”

Section: Coatings 2018 8 X For Peer Review 2 Of 13mentioning

confidence: 99%

“…The CVD diamond films retain similar properties to natural diamond and, when applied to the face of the seals, can significantly increase their performance and lifetime, desirable characteristics for this type of device [15].…”

Section: Coatings 2018 8 X For Peer Review 2 Of 13mentioning

confidence: 99%

HFCVD Diamond-Coated Mechanical Seals

et al. 2018

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A mechanical seal promotes the connection between systems or mechanisms, preventing the escape of fluids to the exterior. Nonetheless, due to extreme working conditions, premature failure can occur. Diamond, due to its excellent properties, is heralded as an excellent choice to cover the surface of these devices and extend their lifetime. Therefore, the main objective of this work was to deposit diamond films over mechanical seals and test the coated seals on a water pump, under real working conditions. The coatings were created by hot filament chemical vapor deposition (HFCVD) and two consecutive layers of micro-and nanocrystalline diamond were deposited. One of the main difficulties is the attainment of a good adhesion between the diamond films and the mechanical seal material (WC-Co). Nucleation, deposition conditions, and pre-treatments were studied to enhance the coating. Superficial wear or delamination of the film was investigated using SEM and Raman characterization techniques, in order to draw conclusions about the feasibility of these coatings in the WC-Co mechanical seals with the purpose of increasing their performance and life time. The results obtained gave a good indication about the feasibility of this process and the deposition conditions used, with the mechanical seals showing no wear and no film delamination after a real work environment test.

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Origin, state of the art and some prospects of the diamond CVD

Cited by 20 publications

References 16 publications

Carbon redistribution processes in nanocarbons

Carbon redistribution processes in nanocarbons

Investigation of the unit cell parameter and dislocation structure of polycrystalline diamond films

HFCVD Diamond-Coated Mechanical Seals

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