Ana Sofia Clímaco Monteiro de Oliveira
Universidade Federal do Paraná
Palestra / Lecture:
Aluminização de ligas de Ni
Aluminization of Ni based alloys
Resumo da palestra / Summary of the lecture:
Pack aluminizing is a very competitive coating process being used in small component with a wide range of
geometries. It is particularly attractive to protect components exposed to high temperature oxidation or carburizing
environments. However, applications that require protection against hydrogen permeation and corrosion in
hydrocarbons and sulphurous atmospheres have also been mentioned in the literature. Pack aluminizing is a
thermochemical treatment involving the substitutional diffusion of Al so that the surface is enriched in Al. The
aluminizing procedure involves a cementation treatment followed by oxidation above 1100ºC. To accomplish the
required performance an oxide layer of alpha-alumina has to be formed and all other allotropic forms of alumina
avoided. Pack aluminizing processing parameters and the role of the activity of Al are presented. The microstructural
architecture and subsequent performance of components, depends on the inward diffusion of Al or outward diffusion
of Ni. Also, the chemical composition of the Ni alloy has an important role on the formation of the main
microstructural features, including the inter-NiAl aluminide layer and should always be
addressed during the design of the processing procedures. The microstructure is a key factor to obtain a high
performance seeing that coatings are continuously reacting with the atmosphere and with the alloy therefore an Al
reserve is require to maintain the Al2O3 layer.
Currículo / Summary resume:
Engenheira Metalúrgica e de Materiais (IST-Lisboa/Portugal), PhD (The University of Birmingham/UK). Professor
Titular da UFPR desde 1995, atualmente é coordenadora da Pós-graduação me Engenharia e Ciência dos Materiais.
Pesquisadora Visitante na UCSB/US em 2009 e 2012. Vice Diretora e Diretora da Regional da ABM/PR no período de
2005-2009. Editora-Chefe da Revista Soldagem&Inspeção desde 2012. Suas pesquisas se destacam no
processamento de superfícies, deposição de revestimentos e difusão, para altas temperaturas de trabalho.
Metallurgy and Materials Science (The University of Birmingham/UK). Full professor at UFPR since 1995 is the head of
the Graduation program on Materials Science and Engineering. Visiting Researcher at UCSB/US in 2009 and 20012.
Vice-director and Director of ABM/PR from 2005 to 2009. Ediotr inChief od REvista Soldagem&Inspeção since 2012.
Her research focus on the surface processing, hardfacing and pack cementaion, for high temperature applications.