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The gas‐dynamic synthesis of diamond by thermal activation
Author(s) -
Emelyanov Alexei,
Rebrov Aleksey,
Yudin Ivan
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431175
Subject(s) - diamond , nozzle , materials science , hydrogen , synthetic diamond , torr , chemical vapor deposition , volumetric flow rate , thermal , substrate (aquarium) , chemical engineering , chemistry , nanotechnology , composite material , mechanics , thermodynamics , physics , organic chemistry , oceanography , geology , engineering
The study presents results on deposition of diamond structures from high‐velocity flows of carbon‐containing a gas mixture activated by hot surfaces. Important problems were solved by creation of the reactor using a spiral of heat‐resistant material, inserted into the chamber with an inlet nozzle. The possibilities of diamond synthesis in wide parameters ranges (pressure from 10 −4 to 100 Torr, flow rates from 500 to 3000 sccm, substrate temperature from 1100 to 1600 K) have been studied experimentally. For analysis of the hydrogen flow, the direct simulation Monte Carlo (DSMC) method was used. The activation–deactivation influence of reactor surfaces has been taken into account. The results of diamond crystal synthesis are presented for the cases of joint and separated H 2 and CH 4 gas delivery. Due to retaining the catalytic tungsten properties in the case of separated gas delivery, an increasing growth rate of diamond crystals was discovered.