Combustion Flowfield Prediction for CVD Diamond Synthesis

1992 ◽  
Author(s):  
Mingchun Dong ◽  
David G. Lilley
Keyword(s):  
Computer Code ◽  
Cvd Diamond ◽  
Separation Distance ◽  
Diamond Growth ◽  
Diamond Synthesis ◽  
Jet Flame ◽  
Axisymmetric Jet ◽  
Jet Nozzle ◽  
Combustion Flow ◽  
Oxygen Ratio

Abstract A computer code has been developed to simulate the combustion flowfield of an axisymmetric jet flame impinging normally on to a flat plate. Premixed oxygen and acetylene emerges from the jet nozzle, and complexities include turbulence and high temperature chemical kinetics. In CVD diamond synthesis, parameters of interest include the fuel-oxygen ratio and the distance from the heat nozzle to the surface. Combustion flow field predictions are given for acetylene and oxygen flames (all fuel rich), axisymmetric-vertical impingement on an adiabatic surface to show the effects of varying the nozzle-substrate separation distance, nozzle size, overall equivalence ratio and flow rate on the flowfield and substrate temperature. These have been shown to have dramatic effects on the rate of diamond growth on the surface.

Impinging Flame Prediction for CVD Diamond Synthesis

1993 ◽  
Author(s):  
Mingchun Dong ◽  
David G. Lilley
Keyword(s):  
Surface Temperature ◽  
Substrate Surface ◽  
Synthesis Method ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Separation Distance ◽  
Diamond Growth ◽  
Chemical Vapor Deposition Diamond ◽  
Diamond Synthesis ◽  
Complex Chemistry

Abstract High-temperature flames impinging normally onto adiabatic surfaces are considered. These are important in the CVD (chemical vapor deposition) diamond synthesis method for diamond growth on surfaces. Problems of complex chemistry and the mechanism of diamond growth are discussed. The present paper has illustrated the effects of several key parameters on the substrate surface temperature and flowfield for CVD diamond synthesis by impinging oxy-acetylene jet flames. The studies were concerned with combustion flowfield predictions, oxy-acetylene flames, axisymmetric-vertical impingement on an adiabatic surface, and the effects of varying the nozzle-substrate separation distance, nozzle size, overall equivalence ratio and flow rate on the substrate surface temperature and flowfield. This investigation provides a key to linking the flame with diamond growth rate on the substrate surface, complements the other facets of the project, and shows that the parametric influences can be predicted with relative ease, thereby extending the range of previously found experimental data.

Implementation of CVD Diamond Growth Methods for Selective and Efficient Formation of Color-Centers in Diamond

2015 ◽  
Vol 1728 ◽  
Author(s):  
Stefano Gay ◽  
Giacomo Reina ◽  
Ilaria Cianchetta ◽  
Emanuela Tamburri ◽  
Mariglen Angjellari ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Structural Features ◽  
Diamond Growth ◽  
Color Centers ◽  
Diamond Synthesis ◽  
Substrate Preparation ◽  
Photoluminescence Emission ◽  
Diamond Phase ◽  
Growth Methods

ABSTRACTWe report here on the chemical methodologies that are being settled in our labs for the insertion in diamond of foreign atoms and consequent creation of fluorescent defects. The inclusion of Si, Cr, Ge, able to produce color centers, is directly obtained during the process of diamond synthesis by means of a CVD technique. The deposition of the diamond films takes place on substrates of different nature, treated following procedures specifically settled to control the insertion of the different species. The photoluminescence emission from a series of diamond samples grown on different substrates (Si, Ge and Ti) has been investigated and is discussed with reference to the morphological/structural features of the diamond phase and to the experimental procedures adopted for substrate preparation.

Metastable nanosized diamond formation from a C-H-O fluid system

2010 ◽  
Vol 25 (12) ◽  
pp. 2336-2340 ◽  
Author(s):  
S.K. Simakov
Keyword(s):  
Experimental Data ◽  
Chemical Vapor Deposition ◽  
Synthesis Gas ◽  
Vapor Deposition ◽  
Present Model ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Diamond Synthesis ◽  
Diamond Formation ◽  
Fluid System

The model of nanosized diamond particles formation at metastable P-T parameters from a C-H-O fluid system is presented. It explains the hydrothermal formation and growth of diamond and the specifics of chemical vapor deposition (CVD) diamond synthesis gas mixtures at low P-T parameters. Further, the model explains the genesis of interstellar nanodiamond formations in space and the genesis of metamorphic microdiamonds in shallow depth Earth rocks. In contrast to models where many possible reactions are considered, the present model makes the simplest possible assumptions about the key processes, and is then able to account for various tendencies seen in experimental data.

scholarly journals The Transformation from (111) to (100): A Routine to Large-Scale Epitaxial Diamond

2020 ◽  
Author(s):  
Yang Wang ◽  
Weihua Wang ◽  
Shilin Yang ◽  
Jiaqi Zhu
Keyword(s):  
Large Scale ◽  
Diamond Films ◽  
Diamond Growth ◽  
Nucleation Density ◽  
Diamond Synthesis ◽  
First Principle ◽  
High Quality ◽  
First Principle Calculations ◽  
Large Size ◽  
Experimental Researches

Diamond is a material with excellent performances which attracts the attention from researchers for decades. Pt (111), owing to its catalytic activity on diamond synthesis, is regarded to be a candidate for diamond hetero-epitaxity, which can enhance nucleation density. Molten surface at diamond growth temperature can also improve mobility and aggregation capability of primitive nuclei. Generally, (100)-oriented is welcomed for the achivement of high quality and large size diamond, since the formation of defects and twins are prevented. First-principle calculations and experimental researches were carried out for the study of transformation of orientation. The transformation from {111} to {100}-oriented diamond has been observed on Pt (111) substrate, which can be promoted by the increase of carbon source concentration and substrate temperature. The process is energetic favorable, which may provides a way towards large-scale (100) diamond films.

Investigation of silicon-vacancy centers formation during the CVD diamond growth of thin and delta doped layers

2021 ◽  
Author(s):  
Mikhail Lobaev ◽  
Alexey Gorbachev ◽  
Dmitry Radishev ◽  
Anatoly Vikharev ◽  
Sergey Bogdanov ◽  
...  
Keyword(s):  
Cvd Diamond ◽  
Diamond Growth ◽  
Color Centers ◽  
Silicon Vacancy ◽  
Silicon Doped ◽  
The Relationship

The results of a study of the deposition of silicon-doped epitaxial diamond layers in a microwave CVD reactor to create silicon-vacancy color centers are presented. The relationship between the optical...

scholarly journals Analytical TEM study of CVD diamond growth on TiO2 sol–gel layers

2012 ◽  
Vol 23 ◽  
pp. 93-99 ◽  
Author(s):  
Ying-Gang Lu ◽  
Johan Verbeeck ◽  
Stuart Turner ◽  
An Hardy ◽  
Stoffel D. Janssens ◽  
...  
Keyword(s):  
Sol Gel ◽  
Cvd Diamond ◽  
Diamond Growth ◽  
Analytical Tem ◽  
Tio2 Sol

OES study of the plasma during CVD diamond growth using CCl 4 /H 2 /O 2 mixtures

2000 ◽  
Vol 9 (3-6) ◽  
pp. 368-372 ◽  
Author(s):  
N.G. Ferreira ◽  
E.J. Corat ◽  
V.J. Trava-Airoldi ◽  
N.F. Leite
Keyword(s):  
Cvd Diamond ◽  
Diamond Growth

Developments in CVD-Diamond Synthesis During the Past Decade

MRS Bulletin ◽  
1998 ◽  
Vol 23 (9) ◽  
pp. 22-27 ◽  
Author(s):  
James E. Butler ◽  
Henry Windischmann
Keyword(s):  
Thermal Management ◽  
Technological Progress ◽  
Radiation Detection ◽  
Hard Coatings ◽  
Diamond Growth ◽  
Diamond Synthesis ◽  
The Past ◽  
Scientific Curiosity ◽  
Wide Range ◽  
The Cost

The last decade and a half has seen an explosive growth in the synthesis of diamond materials by a variety of chemicalvapor-deposition (CVD) processes driven by both scientific curiosity and technological exploitation for diverse applications in the fields of hard coatings, tools, optics, passive and active electronics, thermal management, corrosion protection, and radiation detection. Beginning in the 1980s, micron-sized diamond particles were reported by a few groups using hot filaments and a seemingly magical (alchemical) recipe of hydrocarbons and hydrogen. Now near the end of the 1990s, the basic science of diamond growth by CVD is well-understood. Diverse plasma- and thermal-based techniques have been developed for deposition of diamond. Polycrystalline films several mm thick and over 12 in. (30 cm) in diameter are a reality. Many companies are commercializing a wide range of products, and the cost of deposition has dropped by over three orders of magnitude. This article reviews these developments and highlights challenges for the future. It is organized along two themes: scientific advances and technological progress.

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