The gas-dynamic synthesis of diamond by thermal activation

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. T...

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Bibliographic Details
Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2014-10, Vol.211 (10), p.2279-2283
Main Authors: Emelyanov, Alexei, Rebrov, Aleksey, Yudin, Ivan
Format: Article
Language:English
Subjects:
Activation
Computer simulation
Crystals
diamond
Diamonds
gas dynamics
Hot surfaces
Monte Carlo methods
Reactors
Synthesis
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Summary: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 H2 and CH4 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.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201431175