Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/tmm.2014.029
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

MICROSTRUCTURAL CHARACTERIZATION OF TiN/ZrN MULTILAYER COATINGS ON TITANIUM ALLOY PRODUCED BY POWDER METALLURGY

CARACTERIZAÇÃO MICROESTRUTURAL DE RECOBRIMENTOS MULTICAMADAS TiN/ZrN EM LIGA DE TITÂNIO PRODUZIDA POR METALURGIA DO PÓ

Henriques, Vinicius André Rodrigues; Schichi, Octávio Camargo; Galvani, Eduardo Tavares

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Abstract

The development of multilayered structures has attracted attention from scientific community during recent years. TiN/ZrN coatings with a number of alternate layers have high potential for use in optical, electromagnetism and wear areas. In this work, three sets of multilayered TiN/ZrN coatings presenting variable thickness were designed and deposited by electron beam-physical vapor deposition (EB-PVD). Ti-35Nb-7Zr-5Ta substrates were produced by powder metallurgy from a mixture of hydrided powders with subsequent cold pressing steps and sintering at 1400°C, in high vacuum. TiN/ZrN coatings were obtained by evaporation of alternating Ti and Zr cylindrical targets under a nitrogen flow. The multilayer coatings were characterized by means of scanning electron microscopy (SEM), chemical analysis via energy dispersive spectrometry (EDS) and Vickers indentation. The multilayer produced showed homogeneous thickness and a consistent columnar structure.

Keywords

Multilayer coatings, Powder metallurgy, EB-PVD, Titanium alloys.

Resumo

O desenvolvimento de estruturas multicamadas tem atraído a atenção da comunidade científica nos últimos anos. Recobrimentos de TiN/ZrN com camadas alternadas apresentam um elevado potencial para uso nas áreas de resistência ao desgaste e magnetismo. Neste trabalho, três seqüencias de recobrimentos multicamadas TiN/ZrN com espessuras variáveis foram obtidas por deposição física de vapores via feixe de elétrons (EB-PVD). Substratos da liga Ti-35Nb-7Zr-5Ta foram produzidos por metalurgia do pó a partir de pós hidrogenados com etapas de prensagem a frio e sinterização a 1400°C, em alto vácuo. Os recobrimentos de TiN/ZrN foram obtidos pela evaporação alternada de alvos cilíndricos de Ti e Zr sob um fluxo de nitrogênio. Os recobrimentos foram caracterizados por meio de microscopia eletrônica de varredura (MEV), análise química via espectrometria de energia dispersiva (EDS) e indentação Vickers. As multicamadas produzidas apresentaram espessuras homogêneas e uma estrutura colunar consistente.

Palavras-chave

Recobrimentos multicamadas, Metalurgia do pó, EB-PVD, Ligas de Titânio.

Referências



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