Tecnologia em Metalurgia, Materiais e Mineração
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Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

SÍNTESE DO INTERMETÁLICO NiAl POR MOAGEM DE ALTA ENERGIA EM MOINHO ATTRITOR

SYNTHESIS OF NiAl INTERMETALLIC USING HIGH-ENERGY MILLING IN AN ATTR ITOR MILL

Kubaski, Evaldo Toniolo; Cintho, Osvaldo Mitsuyuki; Capocchi, José Deodoro T.

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Resumo

Pós de Ni e Al foram misturados na composição Ni50Al50 (% atômica). As misturas de pós foram submetidas à moagem de alta energia em moinho Attritor e Spex por diversos tempos. No Attritor, moagens adicionais foram realizadas seguindo um planejamento fatorial em dois níveis e três variáveis. Monitorou-se a evolução da temperatura do jarro durante as moagens. Os produtos foram caracterizados utilizando-se difratometria de raios X e microscopia eletrônica de varredura. A análise dos difratogramas de raios X, em conjunto com as curvas da temperatura do jarro em função do tempo de moagem, indica a formação do composto NiAl tanto em pós processados em moinho Spex quanto Attritor. No entanto, no Spex a formação ocorre para tempos inferiores de moagem. O planejamento fatorial indica que menores poderes de moagem levam a um maior aproveitamento do pó de entrada no Attritor. As micrografias eletrônicas de varredura indicam que as amostras processadas no Attritor produziram partículas na forma de flakes e de menor tamanho em relação àquelas processadas no Spex

Palavras-chave

Moagem de alta energia, Intermetálico NiAl, Planejamento fatorial

Abstract

Ni and Al powders were mixed at Ni50Al50 composition (%at). These mixtures were processed by high-energy milling using Attritor and Spex mills at several milling times. In the Attritor mill, additional millings following a 23 factorial design were performed. Vial temperature during milling was measured. The milling products were characterized by X-ray diffraction (DRX) and scanning electron microscopy (SEM). Analysis of X-ray diffraction patterns, in addition to the evolution of vial temperature during milling, indicate NiAl intermetallic formation either in Spex or Attritor. However, in Spex this compound appears in lower milling times. The factorial design suggests that, when using an Attritor mill, lower ball-to-powder ratios promotes greater values of η. Observing SEM images, the Attritor samples show a flake-like morphology with finer particles as compared to those produced in the Spex mill.

Keywords

High-energy milling, NiAl intermetallic compound, Factorial design

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