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Understanding the phase transformation mechanism of metastable amorphous boron nitride

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Title
Understanding the phase transformation mechanism of metastable amorphous boron nitride
Name (type = personal)
NamePart (type = family)
Örnek
NamePart (type = given)
Metin
NamePart (type = date)
1988-
DisplayForm
Metin Örnek
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Haber
NamePart (type = given)
Richard A.
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Richard A. Haber
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Lehman
NamePart (type = given)
Richard L.
DisplayForm
Richard L. Lehman
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Matthewson
NamePart (type = given)
M. John
DisplayForm
M. John Matthewson
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Miller
NamePart (type = given)
Steven L.
DisplayForm
Steven L. Miller
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
School of Graduate Studies
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (qualifier = exact)
2018
DateOther (qualifier = exact); (type = degree)
2018-10
CopyrightDate (encoding = w3cdtf)
2018
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Boron nitride (BN) is an attractive ceramic material existing in various polymorphic structures such as low-density amorphous, turbostratic, explosive, hexagonal, rhombohedral phases, and high-density wurtzite and cubic phases. Among these, hexagonal (h-BN) and cubic (c-BN) forms of BN have been widely used for various industrial applications thanks to their superior properties. For instance, h-BN possesses high thermal conductivity, high oxidation resistance, and low friction coefficient in air. On the other hand, c-BN is a super hard structural ceramic with a hardness value of ~ 45-70 GPa, second only to diamond. Its superior chemical stability and oxidation resistance, as compared to diamond, makes it the material of choice in cutting and grinding tools, where diamond fails.
The chemical and structural characteristics of h-BN or c-BN strongly depend on the starting material used for their synthesis. Among the starting materials, BCNO compounds are the most common and widely used precursors for h-BN and c-BN synthesis. However, there is lack of understanding on how the chemical and microstructural characteristics of the BCNO precursors impact the formation of BNs and the chemical and microstructural characteristics of the BN formed.
To this end, first BCNO compounds with various chemical/structural characteristics have been synthesized by systematically varying starting composition (boric acid (H3BO3) - melamine (C3H6N6) ratio) and synthesis temperature. Synthesized BCNOs were then subjected to post heat or heat-pressure treatments under equilibrium or non-equilibrium environments to study the relationship between the chemical and microstructural characteristics of the BCNO compounds and their impacts on the formation and structural ordering of h-BN and c-BN. It was found that higher H3BO3 content in the starting composition promotes h-BN formation and its structural ordering. In addition, post heat and heat-pressure treatments also confirmed the above phenomena. The possible mechanisms leading to these phenomena are discussed within the framework of thermodynamic and kinetic principles.
It was also found that plasma spraying metastable BCNO compounds results in c-BN formation without applying external pressure, which, typically higher than 6 GPa, is essential for c-BN formation. Moreover, formation of metastable explosive (e-BN) and wurtzite (w-BN) phases of BN was achieved, for the first time, by emulsion detonation synthesis (EDS) method at the pressures of 5 and 7 GPa, respectively. The results suggest that EDS method has a potential to synthesis metastable and high-density phases of BN.
Subject (authority = RUETD)
Topic
Materials Science and Engineering
Subject (authority = LCSH)
Topic
Boron nitride
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_9146
PhysicalDescription
Form (authority = gmd)
electronic resource
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application/pdf
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text/xml
Extent
1 online resource (171 pages: illustrations)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Metin Örnek
RelatedItem (type = host)
TitleInfo
Title
School of Graduate Studies Electronic Theses and Dissertations
Identifier (type = local)
rucore10001600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/t3-6qpk-ty94
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Örnek
GivenName
Metin
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2018-08-15 14:45:07
AssociatedEntity
Name
Metin Örnek
Role
Copyright holder
Affiliation
Rutgers University. School of Graduate Studies
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
Type
Embargo
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2018-10-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2019-05-02
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 2nd, 2019.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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2018-08-15T13:21:11
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2018-08-15T13:21:11
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