Dry sliding of plasma-sintered iron—The influence of nitriding on wear resistance

Pavanati, Henrique Cezar; Straffelini, Giovanni; Maliska, A.M.; Klein, Aloı́sio Nelmo

doi:10.1016/j.wear.2007.10.014

Cited by 17 publications

(19 citation statements)

References 18 publications

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“…Comparando os valores de dureza obtidos para a camada superficial das amostras apenas enriquecidas com Mo (E700 e E500), um leve aumento pode ser observado para a amostra enriquecida à maior tensão. Valores de dureza entre 90 a 100 HV são comumente obtidos para amostras de ferro puro sinterizadas nas mesmas condições [8][9][10]14], o que está de acordo com os valores obtidos para o substrato das amostras enriquecidas. No caso dessas amostras, esse leve aumento da dureza na região da camada enriquecida pode ser atribuído à formação de solução sólida substitucional entre Fe e Mo.…”

Section: Figuraunclassified

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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Section: Figuraunclassified

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

Bendo¹,

Hermann²,

Lamim³

et al. 2018

ABM Proceedings

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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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“…The formation of a nitride layer inside the communicating pores is prevented when plasma-assisted nitriding is used [17][18][19]. Moreover, the use of plasma processes also enables the production of layers with specific structure and properties because of the large number of freely adjustable treatment parameters [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Nitrided layers have been used to improve the tribological behaviour of PM parts [20,21]. The variation of the nitriding process parameters results in different nitride layer characteristics: phase type, depth, hardness, hardness profile, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of nature of nitride phases on sliding wear of plasma nitrided sintered iron

Binder

Bendo

Hammes

et al. 2015

Wear

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Dry sliding of plasma-sintered iron—The influence of nitriding on wear resistance

Cited by 17 publications

References 18 publications

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

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

Application of Direct Current Plasma Sintering Process in Powder Metallurgy

Effect of nature of nitride phases on sliding wear of plasma nitrided sintered iron

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