Mechanism of infiltration of porous powder-metallurgy parts

Goetzel, C.G.; Shaler, A. J.

doi:10.1007/bf03378307

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Excessive quantities of liquid may produce slumping and separation of the solid skeleton. 24 The fact that brittle failure across the particles is more favourable than ductile fracture in necks is seen when the yield strength is compared with the percentage brittle fracture of particles (Fig. 11).…”

Section: Fracture Modesmentioning

confidence: 99%

Effect of copper infiltration on fracture mode in sintered steels

Campos¹,

Torralba²,

Menapace³

et al. 2008

Powder Metallurgy

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The fracture mode of PM steels depends on features, such as pores, densification, diffusion of any added alloying elements, contact area between particles, microstructural homogeneity, and applied load conditions. Consequently, when a sintered steel is infiltrated, several factors that determine the fracture behaviour are affected. The density is raised (in absolute terms, because the infiltrant is usually of higher density, and in relative terms, because activated sintering is promoted by permanent liquid phase sintering). The liquid phase promotes a rounding of the pores which enhances stress transmission from the necks to the particles. Sintered steel with 0?6%C was infiltrated with three amounts of copper to study the influences of the amount of infiltration and the resultant final density on the fracture mode. Specimens were first uniaxially pressed to 7?0 g cm 23 green density, then sintered and infiltrated simultaneously at 1120uC in a 90N 2 -10H 2 atmosphere. The mechanical results and microstructures were analysed to evaluate the fracture behaviour and fracture surfaces. The mechanical behaviour was characterised by hardness, tensile and three point bending tests.

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Section: Fracture Modesmentioning

confidence: 99%

Effect of copper infiltration on fracture mode in sintered steels

Campos¹,

Torralba²,

Menapace³

et al. 2008

Powder Metallurgy

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“…Spontaneous infiltration of molten metals into metal powder skeletons has been a successful technique in powder metallurgy. 7 During past decades, spontaneous infiltration has been used to prepare ceramic-reinforced metal-matrix composites (MMC). 8 For a solid-liquid-phase system with suitable surface free energy, infiltration can be used to attain full density, precise and complex shapes, and good bonding of composites.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Infiltration of Iron Silicides into Silicon Carbide Powder Preforms

Pan

Baptista

2000

Journal of the American Ceramic Society

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The infiltration of liquid Fe 3 Si (mp of ϳ1300°C), Fe 5 Si 3 (mp of ϳ1210°C), and FeSi (mp of ϳ1410°C) into SiC powder preforms was performed at various infiltration temperatures for 60 min under either argon flow or dynamic vacuum. The amount of infiltration under various infiltration conditions was studied as a function of infiltration temperature. For the preforms as-pressed from raw SiC powder, the amount of infiltration of the three silicides under argon flow was independent of their melting points, but suddenly increased within a common temperature range from 1450°to 1550°C. Thermodynamic analyses indicated that the common temperature range corresponded to the temperature at which the SiO 2 on the surface of the SiC particles was decreased under argon flow. Infrared spectroscopy showed SiO 2 on the surfaces of as-received SiC powder particles, but not on the surfaces of the SiC powder particles fired under argon at 1600°C. The amount of infiltration of the as-pressed SiC under vacuum and of fired SiC under argon and vacuum exhibited an obvious dependence on the silicide melting points. This was attributed to the SiO 2 reduction taking place at temperatures lower than the melting points of the silicides. The amount of infiltration was then controlled by the melt viscosity.

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Mechanical properties of some composite materials

Golovin¹,

Zuev²

1976

Strength Mater

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Mechanism of infiltration of porous powder-metallurgy parts

Cited by 7 publications

References 3 publications

Effect of copper infiltration on fracture mode in sintered steels

Effect of copper infiltration on fracture mode in sintered steels

Spontaneous Infiltration of Iron Silicides into Silicon Carbide Powder Preforms

Mechanical properties of some composite materials

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