Corrosion study of plasma sintered unalloyed iron: The influence of porosity sealing and Ni surface enrichment

Marchiori, R.; Maliska, A.M.; Borges, Paulo César; Klein, Aloı́sio Nelmo; Muzart, J.L.R.

doi:10.1016/j.msea.2007.02.090

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…Important results relating the surface porosity of the PM parts to the mechanical and chemical characteristics can be found in different studies [18,19] . MAR-CHIORI et al [18] provided evidence that the effect of surface porosity on the corrosion resistance of the PM part is more important than the Ni surface alloying effect. PAVANATI et al [19] verified that the nitriding treatment improved the wear resistance of the sintered samples by one order of magnitude.…”

Section: Metallurgical Characteristics Of the Plasma Nitrided Layermentioning

confidence: 99%

DC Plasma Technology Applied to Powder Metallurgy: an Overview

Klein¹,

Cardoso²,

Pavanati³

et al. 2013

Plasma Sci. Technol.

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DC plasma is a very promising technology for processing different materials, and is becoming especially interesting when low environmental impact and high-performance treatments are needed. Some of the intrinsic characteristics of DC plasma technology, which make it suitable for powder metallurgy (PM) and powder injection molding (PIM) parts production, are lowpressure processing and plasma environment high reactivity. Moreover it can be considered as a highly competitive green technology. In this work, an overview of some of the important DC plasma techniques applied to PM and PIM parts processing is presented. Emphasis is given to the descriptions of the main characteristics and the technique potentials of plasma-assisted nitriding, plasma-assisted thermal debinding, plasma-assisted sintering, and simultaneously plasma-assisted sintering and surface alloying. The aspects presented and discussed in this paper indicate that DC plasma processes are promising and competitive techniques for PM and PIM parts processing.

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Section: Metallurgical Characteristics Of the Plasma Nitrided Layermentioning

confidence: 99%

DC Plasma Technology Applied to Powder Metallurgy: an Overview

Klein¹,

Cardoso²,

Pavanati³

et al. 2013

Plasma Sci. Technol.

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“…Torr (1333-3999 Pa), considering pulse voltages of 600-700 V [11][12][13][14][15][16]. This condition, i.e., for parts acting as the cathode of the plasma device, is illustrated in Figure 3…”

Section: The Different Techniques Of DC Plasma Sinteringmentioning

confidence: 99%

“…If the cathode configuration is considered only, in the absence of the hollow cathode effect, the use of pressures around 10-30 Torr is necessary to attain sintering temperatures for iron components, as confirmed in [11][12][13][14][15][16], whereas pressures around 3-10 Torr are enough in the HCD, as shown in Figure 7(a, b and c).…”

Section: Application Of Direct Current Plasma Sintering Process In Pomentioning

confidence: 99%

Application of Direct Current Plasma Sintering Process in Powder Metallurgy

Brunatto¹,

Cardoso²,

NelmoKlein³

2017

Powder Metallurgy - Fundamentals and Case Studies

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Direct current (dc) plasma-assisted sintering of metal parts is a promising and relatively new research and development field in powder metallurgy (PM). In the present entry, it is intended to introduce the reader to the main applications of the dc plasma sintering process in PM. To achieve this goal, the present entry is divided in a brief introduction and sections in which the bases of the dc plasma abnormal glow discharge regime and its influence in the sintering process are carefully treated. In this case, a clear language is purposely used to didactically introduce the reader to this "fascinating glow world", the dc plasma-assisted sintering of metal parts, aiming to put in evidence the main points on physicochemical aspects of the plasma environment, basic knowledge of the plasma heating, and surface-related phenomena during dc plasma sintering of parts.All these aspects are treated considering the main techniques of the dc plasma-assisted sintering process applied to PM. Finally, some results on DC plasma heating, sintering and surface modification are presented.

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“…Exemplo disso é o elemento molibdênio que ao ser misturado ao ferro requer altas temperaturas de sinterização devido ao seu baixo coeficiente de difusão, ou ainda altas pressões de compactação quando utilizado através de pós portadores de liga. A utilização da tecnologia a plasma para o enriquecimento superficial de componentes sinterizados com elementos de liga é algo conhecido e consolidado [4][5][6]. Nessa técnica, os átomos do elemento de liga são provenientes de um cátodo e pulverizados por bombardeamento de íons e neutros rápidos advindos do mesmo cátodo.…”

Section: Introductionunclassified

Enriquecimento Superficial Com Molibdênio E Cementação a Plasma De Ferro Puro Sinterizado

Bendo¹,

Hermann²,

Lamim³

et al. 2018

ABM Proceedings

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ResumoAmostras de ferro puro sinterizadas foram enriquecidas superficialmente com molibdênio e em seguida foram cementadas. Todos os tratamentos térmicos foram realizados utilizando descarga luminescente anormal. Durante o processo de sinterização e de enriquecimento superficial as amostras são colocadas sobre o ânodo da descarga, na configuração cátodo-ânodo confinado. O bombardeamento da superfície do cátodo por espécies energéticas produz a pulverização de átomos do cátodo que se depositam na superfície da amostra e se difundem até certa profundidade. Foi observado que a espessura da camada superficial enriquecida está relacionada à energia de bombardeamento das espécies. Durante o processo de cementação, a presença de Mo na região superficial favorece a estabilização da fase α-Fe alterando a cinética de precipitação da cementita nessa região. A cementação das amostras enriquecidas com molibdênio elevou os valores de dureza obtidos para a região superficial. Palavras-chave: Enriquecimento superficial com Mo; Descarga luminescente anormal; Cementação. SURFACE Mo-ENRICHMENT AND PLASMA CARBURIZING ON UNALLOYED SINTERED IRON AbstractUnalloyed iron samples produced by powder metallurgy were surface alloying with molybdenum followed by carburizing using abnormal glow discharge. During the sintering and Mo-enrichment process, the samples are placed on the anode of the discharge, in the confined anode-cathode configuration. The bombardment of the cathode by energetic particles produces sputtering of atoms, which by diffusion in the gas phase deposit on the sample surface and diffuses into the sample until a certain depth. It was observed that the thickness of the Mo-enriched layer is related to the ion energy bombardment of the Mo-cathode. During the carburizing process, the presence of Mo into the surface region promotes the stabilization of the α-Fe phase, changing the kinetics of precipitation of Fe3C in this region. The carburization of Mo-enriched samples increased the hardness in the surface region of the samples.

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Corrosion study of plasma sintered unalloyed iron: The influence of porosity sealing and Ni surface enrichment

Cited by 10 publications

References 14 publications

DC Plasma Technology Applied to Powder Metallurgy: an Overview

DC Plasma Technology Applied to Powder Metallurgy: an Overview

Application of Direct Current Plasma Sintering Process in Powder Metallurgy

Enriquecimento Superficial Com Molibdênio E Cementação a Plasma De Ferro Puro Sinterizado

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