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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2016.tde-24102016-115435
Document
Author
Full name
Raissa Lima de Oblitas
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Salvadori, Maria Cecilia Barbosa da Silveira (President)
Migliano, Antonio Carlos da Cunha
Tschiptschin, Andre Paulo
Title in Portuguese
Avaliação da composição elementar de filmes finos de ligas metálicas depositados por Arco Catódico Filtrado em Vácuo utilizando RBS e EDS quantitativo
Keywords in Portuguese
filmes finos; arco catódico; EDS
Abstract in Portuguese
Devido à relevância de filmes finos, as técnicas que são utilizadas para produzi-los e também para caracteriza-los tem se tornado importante. Neste contexto, foram analisados filmes finos de até 100 nm, de duas ligas metálicas (cromel e alumel), obtidos a partir da deposição por plasma de Arco Catódico Filtrado em Vácuo (Filtered Cathodic Vacuum Arc - FCVA). O objetivo deste projeto foi avaliar a similaridade em composição elementar entre os materiais utilizados para deposição, que operam como cátodos, e os filmes finos depositados, a partir de medições obtidas pela técnica de microanálise quantitativa Energy Dispersive Spectroscopy (EDS). Para comparação entre resultados e apreciação de compatibilidade, foi realizada avaliação estatística considerando o Teste t, no qual a estatística do teste é dada pela Distribuição t de Student, adotando nível de significância de 5%. Os valores obtidos por EDS Quantitativo para os cátodos foram de (em wt%) (90,3 ± 0,5)% de Ni e (9,72 ± 0,19)% de Cr para o cromel e (95,1 ± 0,8)% de Ni, (2,02 ± 0,14)% de Mn, (1,65 ± 0,04)% de Si e (1,15 ± 0,05)% de Al para o alumel. Já para os filmes finos, foram de (90,2 ± 0,5)% de Ni e (9,8 ± 0,5)% de Cr para o cromel e (95,2 ± 0,4)% de Ni, (2,8 ± 0,4)% de Mn, (0,77 ± 0,17)% de Si e (1,08 ± 0,09)% de Al para o Alumel, ambos apresentando compatibilidade com as medidas por Rutherford Backscattering Spectrometry (RBS) - técnica comumente utilizada para este tipo de espécime. Verificou-se que a composição elementar do filme fino de cromel não apresentou diferença significativa com o cátodo da mesma liga. Entretanto, para o filme fino de alumel, houve evidências de diferença significativa com relação ao cátodo, apontada pelo elemento silício.
Title in English
Evaluation of the elemental composition of alloy thin films deposited by Filtered Cathodic Vacuum Arc using RBS and quantitative EDS analysis
Keywords in English
thin films; Filtered Cathodic Vacuum Arc; EDS analysis
Abstract in English
Due the relevance of thin films, the techniques used to produce and also to characterize them has become important. In this context, it was analyzed thin films up to 100 nm of two alloys (Chromel and Alumel) obtained by plasma deposition using Filtered Cathodic Vacuum Arc (FCVA). The objective of this project was to evaluate the similarity in elemental concentration of the materials used for deposition, which act as cathodes, and the deposited thin films, through measurements obtained by quantitative microanalysis technique Energy Dispersive Spectroscopy (EDS). In order to compare results and compatibility assessment was performed statistical analysis considering the t-test in which the test statistic is given by the Student's t - distribution, adopting a significance level of 5%. The values obtained by Quantitative EDS for the cathodes were (in wt%) (90.3 ± 0.5)% of Ni and (9.72 ± 0.19)% of Cr for the Chromel and (95.1 ± 0.8)% of Ni, (2.02 ± 0.14)% of Mn, (1.65 ± 0.04)% of Si and (1.15 ± 0.05)% of Al for the Alumel. As for the thin films, they were (90.2 ± 0.5)% of Ni and (9.8 ± 0.5)% of Cr for the Chromel and (95.2 ± 0.4)% of Ni, (2.8 ± 0.4)% of Mn, (0.77 ± 0.17)% of Si and (1.08 ± 0.09)% for Al Alumel, both featuring compatibility with the measures by Rutherford Backscattering Spectrometry (RBS) - technique commonly used for this type of specimen. It was verified that the elemental concentration of the thin film of Chromel presented no significant difference with the cathode of the same alloy. However, for the Alumel thin film, there was evidence of a significant difference with respect to the cathode, appointed by element Silicon.
 
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Publishing Date
2016-10-25
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • LIMA DE OBLITAS, RAISSA; TEIXEIRA, FERNANDA; SALVADORI, MARIA CECÍLIA . Determination of the composition and thickness of chromel and alumel thin films on different substrates by quantitative energy dispersive spectroscopy analysis. MICROSCOPY RESEARCH AND TECHNIQUE, v. 85, p. 437-446, 2022.
All rights of the thesis/dissertation are from the authors
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