Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno

Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Aplicada. Fecha de lectura: 16-06-2014

Detalles Bibliográficos
Autor: Ramírez Maglione, María Cristina
Tipo de recurso: tesis doctoral
Fecha de publicación:2014
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:español
OAI Identifier:oai:repositorio.uam.es:10486/662461
Acceso en línea:http://hdl.handle.net/10486/662461
Access Level:acceso abierto
Palabra clave:Nanoestructuras - Tesis doctorales
Nanotecnología - Tesis doctorales
Física
id ES_c094c0803d09abf94995ea0cd095f2c6
oai_identifier_str oai:repositorio.uam.es:10486/662461
network_acronym_str ES
network_name_str España
repository_id_str
spelling Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafenoRamírez Maglione, María CristinaNanoestructuras - Tesis doctoralesNanotecnología - Tesis doctoralesFísicaTesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Aplicada. Fecha de lectura: 16-06-2014This work examines the fabrication and properties of silicon nitride / graphene based nanostructures composites densified by the spark plasma sintering technique with the aim of proving the mechanical reinforcement effect expected by the excellent properties of the graphene fillers. Dense and homogeneous Si3N4 composites containing different type of carbon nanofillers were processed by dispersion of pristine graphene nanoplatelets, graphene oxide and unzipped multiwall carbon nanotubes into the ceramic slurry containing the ceramic matrix powders and sintering additives. Spark plasma sintering was selected as consolidation technique due to the lower temperatures and shorter times required for densification, compared to conventional sintering methods, preventing the damage of the carbon nanostructures. Scanning and transmission microscopy combined with construction of Raman intensity maps revealed differences in the exfoliation degree of the nanofillers, which also influenced ceramic grain growth, and evidenced the orientation effect in the nanofillers due to uniaxial pressure applied during sintering stage. The strong orientation clearly differentiates the electrical and thermal behavior of the materials in the directions parallel and perpendicular to the graphene plane having also a significant role in these properties the crystalline quality of carbon lattice. The low shear resistance between graphene layers in the nanostructures affects elastic modulus and hardness of the materials compared to monolithic Si3N4 producing a certain softening, however, the toughening effect of the three types of nanostructures was demonstrated for crack propagating perpendicular to the nanofiller aligment direction, being the bridging mechanism the main responsible of the toughness increase. Reduced graphene oxide nanosheets were the most effective reinforcements achieving 135% higher fracture toughness than Si3N4 under the same sintering and testing conditions. On the top of that, the nanofillers induce an electrical response of the composites once they form a connected network for small concentrations indeed, therefore, being quite dependent of the exfoliation and again on the nanofiller orientation. Very similar behavior is observed for the thermal conductivity of the composites, and with a heat flow rate for the orientations matching the graphene plane. These results have shown that graphene nanoplatelets and nanoribbons can be used as effective fillers for ceramic composites with tailored properties intended not only for applications that require good mechanical performance but wear resistance, good heat conduction and electrical conductivity.Osendi Miranda, María IsabelPoza Gómez, PedroDepartamento de Física AplicadaFacultad de Ciencias20142014-06-16doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesisapplication/pdfhttp://hdl.handle.net/10486/662461reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridEspañolspaopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6624612026-06-23T12:46:27Z
dc.title.none.fl_str_mv Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
title Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
spellingShingle Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
Ramírez Maglione, María Cristina
Nanoestructuras - Tesis doctorales
Nanotecnología - Tesis doctorales
Física
title_short Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
title_full Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
title_fullStr Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
title_full_unstemmed Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
title_sort Materiales multifuncionales de nitruro de silicio con nanoestructuras reforzanters basadas en grafeno
dc.creator.none.fl_str_mv Ramírez Maglione, María Cristina
author Ramírez Maglione, María Cristina
author_facet Ramírez Maglione, María Cristina
author_role author
dc.contributor.none.fl_str_mv Osendi Miranda, María Isabel
Poza Gómez, Pedro
Departamento de Física Aplicada
Facultad de Ciencias
dc.subject.none.fl_str_mv Nanoestructuras - Tesis doctorales
Nanotecnología - Tesis doctorales
Física
topic Nanoestructuras - Tesis doctorales
Nanotecnología - Tesis doctorales
Física
description Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Aplicada. Fecha de lectura: 16-06-2014
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-06-16
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/662461
url http://hdl.handle.net/10486/662461
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418489575374848
score 15,300724

Similares en LA Referencia