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Previous issue date: 2007-11-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Plasma process like ionic nitriding and cathodic cage plasma nitriding are utilized in order to become hard surface of steels. The ionic nitriding is already accepted in the industry while cathodic cage plasma nitriding process is in industrial implementation stage. Those process depend of plasma parameters like electronic and ionic temperature (Te, Ti), species density (ne, ni) and of distribution function of
these species. In the present work, the plasma used to those two processes has been observed through Optical Emission Spectroscopy OES technique in order to identify presents species in the treatment ambient and relatively quantify them. So plasma of typical mixtures like N2 H2 has been monitored through in order to study evolution of those species during the process. Moreover, it has been realized a
systematic study about leaks, also thought OES, that accomplish the evolution of contaminant species arising because there is flux of atmosphere to inside nitriding
chamber and in what conditions the species are sufficiently reduced. Finally, to describe the physic mechanism that acts on both coating techniques ionic nitriding and cathodic cage plasma nitriding / Processos a plasma como nitreta??o i?nica e nitrteta??o por gaiola cat?dica s?o utilizados para endurecimento de superf?cies de a?os. A nitreta??o i?nica sendo j? consolidada em aplica??es industriais enquanto que o processo por gaiola
cat?dica ainda se encontra em est?gio de pesquisa. Esses processos dependem dos par?metros de plasma como temperatura eletr?nica e de ?ons (Te, Ti), densidade
de esp?cies (ne, ni,) e da fun??o de distribui??o das mesmas. No presente trabalho, o plasma utilizado para esses dois processos foi diagnosticado utilizando a t?cnica de Espectroscopia de Emiss?o ?ptica EEO para identificar as esp?cies presentes no ambiente de tratamento e quantifica-las relativamente. Assim, plasma de mistura gasosa t?pica como N2 H2 foi monitorado, com o intuito de estudar a evolu??o dessas esp?cies durante o processo. Al?m disso, foi realizado um estudo sistem?tico, tamb?m atrav?s de EEO, que acompanha a evolu??o das esp?cies contaminantes surgidas em vazamentos de modo a buscar condi??es onde as
mesmas s?o suficientemente reduzidas. Finalmente busca-se, atrav?s do diagn?stico de plasma por EEO, descrever o mecanismo f?sico de atua??o das duas t?cnicas de tratamento: nitreta??o i?nica e gaiola cat?dica
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12662 |
| Date | 14 November 2007 |
| Creators | Barbosa, J?lio C?sar Pereira |
| Contributors | CPF:09621199468, http://lattes.cnpq.br/7441669258580942, Lima, Francisco Jos? Santos, CPF:42429625415, http://lattes.cnpq.br/1295841954027018, Cinelli, Milton Jos?, CPF:61823040900, http://lattes.cnpq.br/8312452411021996, Alves J?nior, Clodomiro |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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