Gas Phase And Surface Modeling Of Chemical Vapor Deposition Of Pyrolytic Carbon On Silicon Carbide Fibers Using A Pure Methane Precursor

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Gas Phase and Surface Modeling of Chemical Vapor Deposition of Pyrolytic Carbon on Silicon Carbide Fibers Using a Pure Methane Precursor

Author : Rajesh Balachandran
Publisher :
ISBN 13 :
Total Pages : 115 pages
Book Rating : 4.:/5 (895 download)

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Book Synopsis Gas Phase and Surface Modeling of Chemical Vapor Deposition of Pyrolytic Carbon on Silicon Carbide Fibers Using a Pure Methane Precursor by : Rajesh Balachandran

Download or read book Gas Phase and Surface Modeling of Chemical Vapor Deposition of Pyrolytic Carbon on Silicon Carbide Fibers Using a Pure Methane Precursor written by Rajesh Balachandran and published by . This book was released on 2011 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ceramic matrix composites (CMC) constitute a category of composite materials widely used in the aerospace industry as they satisfy the thermal, chemical and mechanical requirements of a good composite material with the drawback being in the high processing costs. Chemical vapor deposition is a process long known for its importance in aerospace and structural applications. Chemical vapor deposition can be used to develop thin interfacial coatings on fibers, which are reinforced in to a matrix according to the application. The interfacial layers are useful for preventing reactions between the fibers and the matrix material at high temperatures. Interfacial coatings can also deflect crack propagation once the composite is put into service. This work focuses on developing a suitable gas phase and surface kinetics model for obtaining the deposition profiles in the chemical vapor deposition of pyrocarbon on silicon carbide fibers at the given conditions of temperature, pressure and feed rate. The model uses an existing gas phase mechanism (National Institute for Standards and Technology and Gas Research Institute). There are combinations of species in the gas phase, but all of them do not lead to the deposition of pyrocarbon. This raises a question as to which of them would affect the rate of deposition and why. For the given conditions of temperature, pressure and flow rate and from the information available in different literature sources acetylene is assumed to be the major depositing specie of pyrocarbon Also, the gas phase mechanism was modified to simplify and suit the needs of the given conditions. The importance behind modeling the surface kinetics is that it could help understand the actual process in the formation of pyrolytic carbon. The mechanism of the pyrocarbon deposition could be important in knowing the type of carbon being deposited, which is of utmost importance in its applications. The modeling data is validated by means of using data obtained from experiments.

Precursor Gas Comparison for the Growth of Silicon Carbide Fibers Via Laser Chemical Vapor Deposition

Author : Mia Catherine Matt
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Precursor Gas Comparison for the Growth of Silicon Carbide Fibers Via Laser Chemical Vapor Deposition by : Mia Catherine Matt

Download or read book Precursor Gas Comparison for the Growth of Silicon Carbide Fibers Via Laser Chemical Vapor Deposition written by Mia Catherine Matt and published by . This book was released on 2020 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser chemical vapor deposition (LCVD) is a processing technique that can be used to grow fibers. In this study, the relationships between deposited SiC fiber composition, fiber microstructure, and fiber mechanical properties (ambient temperature failure stress in tension) were compared using two different precursor gases - Tetramethylsilane (TMS) and Dimethylsilane (DMS) 0́3 using laser chemical vapor deposition (LCVD). Each set of fibers was grown at 2, 4 and 6 bar at a growth rate of 50 um/s. Furthermore, each set of fibers contained a nanocrystalline core. In some cases, the presence of nodular structures were noted, but these features were comprised of nanocrystalline grains. The crystalline structure for both fibers were indexed by X-ray diffraction as the 3C-SiC cubic phase. The fibers were carbon-rich. In general, the TMS fibers had generally higher average stress at failures that were 2280 MPa as compared to the average DMS fibers being 1150 MPa. Considerable spread in the tensile strength at failure was noted for the DMS fibers and is contributed to residual stresses, as they fibers were qualitatively more delicate to handle. A Weibull analysis revealed that the fibers had a low Weibull modulus, which is an indication of a large and unpredictable variation of flaws within the fibers.

A Kinetic and Equilibrium Analysis of Silicon Carbide Chemical Vapor Deposition on Monofilaments

Author : Suleyman Akif Gokoglu
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Kinetic and Equilibrium Analysis of Silicon Carbide Chemical Vapor Deposition on Monofilaments by : Suleyman Akif Gokoglu

Download or read book A Kinetic and Equilibrium Analysis of Silicon Carbide Chemical Vapor Deposition on Monofilaments written by Suleyman Akif Gokoglu and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Aerospace Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 944 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Graded Pyrolytic Graphite/Silicon Carbide Coating Deposition Studies

Author : Joseph P. Copeland
Publisher :
ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Graded Pyrolytic Graphite/Silicon Carbide Coating Deposition Studies by : Joseph P. Copeland

Download or read book Graded Pyrolytic Graphite/Silicon Carbide Coating Deposition Studies written by Joseph P. Copeland and published by . This book was released on 1977 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Codeposited coatings of pyrolytic graphite/silicon carbide were fabricated by chemical vapor deposition at temperatures ranging from 3000 F to 3800 F using methane and methyltrichlorosilane as precursors and nitrogen as a diluent and carrier. The effect of temperature and methyltrichlorosilane concentration on coating composition (SiC content) and morphology were determined. Specimens of codeposited coatings were fabricated to determine the physical properties, thermal stress state and erosion characteristics of various PG/SiC compositions. Coating samples were examined and characterized microscopically, by X-ray diffraction and by electron microprobe. (Author).

Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume II. The Channel Flow Deposition Furnace

Download Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume II. The Channel Flow Deposition Furnace PDF Online Free

Author : T. C. Wallace
Publisher :
ISBN 13 :
Total Pages : 201 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume II. The Channel Flow Deposition Furnace by : T. C. Wallace

Download or read book Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume II. The Channel Flow Deposition Furnace written by T. C. Wallace and published by . This book was released on 1978 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of instrumented engineering tests is described in which a 'channel flow' chemical vapor deposition furnace was used to prepare pyrolytic graphite/silicon carbide (PG/SiC) codeposited material for rocket-nozzle applications. The nozzle section and a water cooled center body formed a vertical annular flow passage for the coating gases. The nozzle section was inductively heated and was coated on the i.d. only. Well-mixed process gas entered the flow annulus with uniform velocity, temperature, and species concentrations from a plenum below the heated substrate. The flow could be either laminar or turbulent, but did not contain recirculating regions. An analytical model of the furnace and deposition process was developed to simulate the heat transfer in the solid components and the flow, chemical kinetics, and heat and mass transport associated with the process gas. Model predictions and test results on temperatures and PG/SiC deposition rates agreed very well. The coating microstructure and inferred quality were characterized by metallography and correlated with the process variables. The report includes detailed descriptions of the furnace, instrumentation, and test procedures in addition to plots of all reduced data. (Author).

Mechanisms of Chemical Vapor Deposition on Carbon Fibers

Author :
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Mechanisms of Chemical Vapor Deposition on Carbon Fibers by :

Download or read book Mechanisms of Chemical Vapor Deposition on Carbon Fibers written by and published by . This book was released on 1990 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deposition of pyrolytic carbon on the surface of carbon substrates, including carbon fibers, was studied at 1000-1100 C using two different systems, a static reactor operating at subambient pressures and a flow reactor operating at atmospheric pressure. The experimental parameters that affect the deposition rates and mechanism are substrate temperature, type of reactor used, total and partial pressure of methane in the static reactor, partial pressure of methane in the flow reactor, flow rate of hydrocarbon above substrate, presence of hydrogen in the deposition medium, and the type of substrate, as well as its surface area. The two main differences between the deposition under flow and static conditions are rates of deposition and characteristics of deposits. While the rate under flow conditions is considerably higher than under static conditions, the deposits in the flow reactor are intact and less porous than those prepared in the static reactor. This is attributed essentially to the presence of hydrogen in the static reactor which lowers the rates of deposition, prevents the growth of intermediate species to large planar molecules, and attacks the carbon deposits.

Handbook of Manufacturing Engineering and Technology

Author : Andrew Y. C. Nee
Publisher : Springer
ISBN 13 : 9781447146698
Total Pages : 0 pages
Book Rating : 4.1/5 (466 download)

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Book Synopsis Handbook of Manufacturing Engineering and Technology by : Andrew Y. C. Nee

Download or read book Handbook of Manufacturing Engineering and Technology written by Andrew Y. C. Nee and published by Springer. This book was released on 2014-10-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Reference Work Handbook of Manufacturing Engineering and Technology provides overviews and in-depth and authoritative analyses on the basic and cutting-edge manufacturing technologies and sciences across a broad spectrum of areas. These topics are commonly encountered in industries as well as in academia. Manufacturing engineering curricula across universities are now essential topics covered in major universities worldwide.

Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume I. The Injector Deposition Furnace

Download Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume I. The Injector Deposition Furnace PDF Online Free

Author : T. C. Wallace
Publisher :
ISBN 13 :
Total Pages : 213 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume I. The Injector Deposition Furnace by : T. C. Wallace

Download or read book Development of Pyrolytic Graphite/Silicon Carbide Composite Materials for Rocket-Nozzle Applications. Volume I. The Injector Deposition Furnace written by T. C. Wallace and published by . This book was released on 1978 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of instrumented engineering tests with a chemical vapor deposition furnace used to prepare pyrographite/silicon carbide codeposited material for rocket nozzle applications is described. Flow into the furnace is an axisymmetric confined jet with high Reynolds and low Mach number. The gas flow within the furnace is characterized by a large separated flow region with associated hot spot and a high level of turbulence. Methods of instrumenting and collecting data, methods for defining the furnace and process characteristics, test procedures, recording and reducing data, data analysis, and model development are documented. Analytical models of the furnace during transient and steady state operation were developed and the results compared with the data obtained. Characterization of the coatings obtained and the associated deposition kinetics are also presented. (Author).

Chemical Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 2616 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Chemical Abstracts by :

Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Surface-Controlled Chemical Vapor Deposition of Silicon Carbide

Author : Jing-Jia Huang
Publisher :
ISBN 13 : 9789179295035
Total Pages : 0 pages
Book Rating : 4.2/5 (95 download)

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Book Synopsis Surface-Controlled Chemical Vapor Deposition of Silicon Carbide by : Jing-Jia Huang

Download or read book Surface-Controlled Chemical Vapor Deposition of Silicon Carbide written by Jing-Jia Huang and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ceramics and Composites Processing Methods

Author : Narottam P. Bansal
Publisher : John Wiley & Sons
ISBN 13 : 0470553448
Total Pages : 598 pages
Book Rating : 4.4/5 (75 download)

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Book Synopsis Ceramics and Composites Processing Methods by : Narottam P. Bansal

Download or read book Ceramics and Composites Processing Methods written by Narottam P. Bansal and published by John Wiley & Sons. This book was released on 2012-04-17 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the latest processing and fabrication methods There is increasing interest in the application of advanced ceramic materials in diverse areas such as transportation, energy, environmental protection and remediation, communications, health, and aerospace. This book guides readers through a broad selection of key processing techniques for ceramics and their composites, enabling them to manufacture ceramic products and components with the properties needed for various industrial applications. With chapters contributed by internationally recognized experts in the field of ceramics, the book includes traditional fabrication routes as well as new and emerging approaches in order to meet the increasing demand for more reliable ceramic materials. Ceramics and Composites Processing Methods is divided into three sections: * Densification, covering the fundamentals and practice of sintering, pulsed electric current sintering, and viscous phase silicate processing * Chemical Methods, examining colloidal methods, sol-gel, gel casting, polymer processing, chemical vapor deposition, chemical vapor infiltration, reactive melt infiltration, and combustion synthesis * Physical Methods, including directional solidification, solid free-form fabrication, microwave processing, electrophoretic deposition, and plasma spraying Each chapter focuses on a particular processing method or approach. Collectively, these chapters offer readers comprehensive, state-of-the-science information on the many approaches, techniques, and methods for the processing and fabrication of advanced ceramics and ceramic composites. With its coverage of the latest processing methods, Ceramics and Composites Processing Methods is recommended for researchers and students in ceramics, materials science, structural materials, biomedical engineering, and nanotechnology.

Hyperbaric Growth of Carbon Fibers by Laser Chemical Vapor Deposition

Author : Justin Lee Rife
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Hyperbaric Growth of Carbon Fibers by Laser Chemical Vapor Deposition by : Justin Lee Rife

Download or read book Hyperbaric Growth of Carbon Fibers by Laser Chemical Vapor Deposition written by Justin Lee Rife and published by . This book was released on 2019 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser Chemical Vapor Deposition (LCVD) is a promising new processing technique by which freestanding structures, such as fibers, can be deposited. The deposition of carbon fibers by use of ethylene as a precursor gas can be easily achieved and has been investigated as a way to complement or even replace current carbon fiber production techniques. The properties of carbon fibers deposited from ethylene via LCVD have been investigated for low precursor pressures thus far. However, deposition rates for low precursor pressures are limited and rates that are orders of magnitude faster can be achieved by use of higher precursor pressures. No detailed studies on properties of fibers processed at these higher pressures have been conducted. This thesis fills this knowledge gap by exploring the relationships between processing conditions, growth behavior, microstructure and mechanical properties of carbon fibers deposited from ethylene at hyperbaric pressures. It is found that the fiber growth rates are limited by surface reaction kinetics at low temperatures, while they are mass transport limited or gas phase nucleation limited at high temperatures. When grown under mass transport limited conditions, fibers exhibit drastic changes in morphology and microstructure. The tensile strengths of the carbon fibers grown by LCVD are generally found to be poor due to the nature of graphitic carbon deposits. However, the Weibull modulus among the LCVD grown carbon fibers is found to be high. Trends in mechanical properties with processing conditions and microstructure are observed.

Chemical Vapor Deposition of Silicon Carbide on Graphite and Titanium Using a Combined Hot Wall and Heated Substrate Reactor

Author : Robert M. Galasso
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (368 download)

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Book Synopsis Chemical Vapor Deposition of Silicon Carbide on Graphite and Titanium Using a Combined Hot Wall and Heated Substrate Reactor by : Robert M. Galasso

Download or read book Chemical Vapor Deposition of Silicon Carbide on Graphite and Titanium Using a Combined Hot Wall and Heated Substrate Reactor written by Robert M. Galasso and published by . This book was released on 1994 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Foundations of Vacuum Coating Technology

Author : Donald M. Mattox
Publisher : William Andrew
ISBN 13 : 0128130857
Total Pages : 383 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis The Foundations of Vacuum Coating Technology by : Donald M. Mattox

Download or read book The Foundations of Vacuum Coating Technology written by Donald M. Mattox and published by William Andrew. This book was released on 2018-08-21 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Foundations of Vacuum Coating Technology, Second Edition, is a revised and expanded version of the first edition, which was published in 2003. The book reviews the histories of the various vacuum coating technologies and expands on the history of the enabling technologies of vacuum technology, plasma technology, power supplies, and low-pressure plasma-enhanced chemical vapor deposition. The melding of these technologies has resulted in new processes and products that have greatly expanded the application of vacuum coatings for use in our everyday lives. The book is unique in that it makes extensive reference to the patent literature (mostly US) and how it relates to the history of vacuum coating. The book includes a Historical Timeline of Vacuum Coating Technology and a Historical Timeline of Vacuum/Plasma Technology, as well as a Glossary of Terms used in the vacuum coating and surface engineering industries. History and detailed descriptions of Vacuum Deposition Technologies Review of Enabling Technologies and their importance to current applications Extensively referenced text Patents are referenced as part of the history Historical Timelines for Vacuum Coating Technology and Vacuum/Plasma Technology Glossary of Terms for vacuum coating

Handbook of Chemical Vapor Deposition

Author : Hugh O. Pierson
Publisher : William Andrew
ISBN 13 : 0815517432
Total Pages : 507 pages
Book Rating : 4.8/5 (155 download)

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Book Synopsis Handbook of Chemical Vapor Deposition by : Hugh O. Pierson

Download or read book Handbook of Chemical Vapor Deposition written by Hugh O. Pierson and published by William Andrew. This book was released on 1999-09-01 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turn to this new second edition for an understanding of the latest advances in the chemical vapor deposition (CVD) process. CVD technology has recently grown at a rapid rate, and the number and scope of its applications and their impact on the market have increased considerably. The market is now estimated to be at least double that of a mere seven years ago when the first edition of this book was published. The second edition is an update with a considerably expanded and revised scope. Plasma CVD and metallo-organic CVD are two major factors in this rapid growth. Readers will find the latest data on both processes in this volume. Likewise, the book explains the growing importance of CVD in production of semiconductor and related applications.

Handbook of Carbon, Graphite, Diamonds and Fullerenes

Author : Hugh O. Pierson
Publisher : William Andrew
ISBN 13 : 0815517394
Total Pages : 420 pages
Book Rating : 4.8/5 (155 download)

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Book Synopsis Handbook of Carbon, Graphite, Diamonds and Fullerenes by : Hugh O. Pierson

Download or read book Handbook of Carbon, Graphite, Diamonds and Fullerenes written by Hugh O. Pierson and published by William Andrew. This book was released on 2012-12-02 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a review of the science and technology of the element carbon and its allotropes: graphite, diamond and the fullerenes. This field has expanded greatly in the last three decades stimulated by many major discoveries such as carbon fibers, low-pressure diamond, and the fullerenes. The need for such a book has been felt for some time. These carbon materials are very different in structure and properties. Some are very old (charcoal), others brand new (the fullerenes). They have different applications and markets and are produced by different segments of the industry.Few studies are available that attempt to review the entire field of carbon as a whole discipline. Moreover these studies were written several decades ago and a generally outdated since the development of the technology is moving very rapidly and scope of applications is constantly expanding and reaching into new fields such as aerospace, automotive, semiconductors, optics, and electronics. In this book the author provides a valuable, up-to-date account of both the newer and traditional forms of carbon, both naturally occurring and man-made. This volume will be a valuable resource for both specialists in, and occasional users of carbon materials.