Role of grain boundaries in sintering

Ichinose, Hiroyuki; Kuczynski, G.G

doi:10.1016/0001-6160(62)90118-9

Cited by 43 publications

(8 citation statements)

References 9 publications

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“…The stress gradient and the difference in gradient in vacancy concentration make the material transfer easier by the phe- nomena of diffusion along the surface and grain boundaries or volume diffusion. The predominant role of grain boundaries as sinks for vacancies arriving from the neck surface was reported in literature [11]. This assumption of cermets' formation is strengthened by the lack of dislocation in molybdenum phase which can be explained by this phenomenon of recrystallisation.…”

Section: Resultsmentioning

confidence: 77%

Microstructural characterization of a composite Mo reinforced by 25at.% TiC

Cédat

Rey

Clavel

et al. 2009

Journal of Nuclear Materials

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Section: Resultsmentioning

confidence: 77%

Microstructural characterization of a composite Mo reinforced by 25at.% TiC

Cédat

Rey

Clavel

et al. 2009

Journal of Nuclear Materials

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“…Powder samples were compacted at two different pressures: 220 and 1500 MPa for the Fe powders and 500 and 1500 MPa for the Cu ones. The sintering behavior of samples was studied using three different dilatometric techniques: constant heating rate (CHR), [12,13] isothermal annealing (IA) [14,15] and the Dorn method. [16] Dilatometric experiments were performed with an ADAMEL DHT60 dilatometer and carried out in vacuum (10 Ϫ5 torr), He (N55, H 2 O Ͻ 2.2 Vpm, O 2 Ͻ 0.5 Vpm, and N 2 Ͻ 1 Vpm), and H 2 (N55) with the same purity.…”

Section: Methodsmentioning

confidence: 99%

Liquidlike sintering behavior of nanometric Fe and Cu powders: Experimental approach

Domínguez

Champion

Bigot

1998

Metall Mater Trans A

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Nanometric Fe and Cu powders were sintered in vacuum, He, and H 2 atmospheres after uniaxial cold pressing. The shrinkage behavior of samples was studied using three different dilatometric techniques: constant heating rate, isothermal annealing, and the Dorn method. Density greater than 90 pct was obtained at sintering temperatures of 900 ЊC. In nanometric powders, densification and grain coarsening occurred in a narrow temperature interval. Despite the low oxide content in the starting powders (1.5 to 4 wt pct), the reducing atmosphere plays a relevant role in the sintering process. The self-diffusion activation energies obtained for nanometric Fe were 116 and 60 kJ/mole in vacuum and H 2 , and those obtained for nanometric Cu were 70 and 43 kJ/mole in He and H 2 . According to the present results, the activation energies obtained from both nanometric powders in H 2 could be associated with those for self-diffusion in liquid Fe (65 kJ/mole) and Cu (41 kJ/mole).

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“…The relationship between the neck radius, x (μm), and time, t (h), is expressed as [13][14][15] . (1) where a is the radius of the particle.…”

Section: Equation For Neck Growth Of Alumina Balls Undermentioning

confidence: 99%

Effects of Interfacial Properties between Molten Iron and Alumina on Neck Growth of Alumina Balls at Sintering in Molten Iron

et al. 2014

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The effects of interfacial properties such as interfacial tension and wettability on the adhesion, agglomeration, and coalescence of inclusions on the immersion nozzle in a continuous casting process have not yet been evaluated quantitatively. In the present work, we focused on the neck growth of alumina balls at sintering because the adhesion, agglomeration, and coalescence of inclusions are regarded as being the consequence of sintering of oxides. We compared the neck growth of alumina balls at sintering in molten iron with that under an Ar gas atmosphere in order to clarify the effects of interfacial properties between alumina balls and molten iron on the sintering of alumina balls in molten iron. We found that neck growth in molten iron proceeds much faster than that under an Ar gas atmosphere. In addition, an equation for the neck growth of alumina balls in molten iron was formulated by evaluating the interfacial properties, i.e., the interfacial tension and wettability, between alumina balls and molten iron. The calculated results derived by considering the capillary phenomena of molten iron at the gap between alumina balls as the effect of wettability were in reasonable agreement with the experimental results in molten iron. These findings show that the non-wetting by molten iron of alumina balls promotes neck growth of alumina balls at sintering in molten iron.

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Role of grain boundaries in sintering

Cited by 43 publications

References 9 publications

Microstructural characterization of a composite Mo reinforced by 25at.% TiC

Microstructural characterization of a composite Mo reinforced by 25at.% TiC

Liquidlike sintering behavior of nanometric Fe and Cu powders: Experimental approach

Effects of Interfacial Properties between Molten Iron and Alumina on Neck Growth of Alumina Balls at Sintering in Molten Iron

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