Shape distortion induced by gravity in the initial stage of solid phase sintering

Liu, Jianxin; Liu, Yang; Lal, Anand; German, Randall M.

doi:10.1016/s1359-6462(99)00079-2

Cited by 9 publications

(2 citation statements)

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“…Thus the observed difference in particle growth rates during CS under terrestrial and microgravity conditions can be attributed to the contribution of natural convection. It is worth noting that the nature of gravity effect on the mechanism of particle growth during CS is different as compared to that reported by German et al 25,26 for liquid-phase sintering.…”

Section: Kinetics Of Tib 2 Particles Growth In Intermetallic Matrixmentioning

confidence: 62%

Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity

et al. 2001

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Combustion synthesis (CS) of NiAl-based materials reinforced by TiB 2 particles was investigated under both terrestrial and microgravity conditions. The synthesized metal matrix composites (MMC) are characterized by very fine (<1 m) reinforced particulates, which have strong bonding along their entire surface with matrix (NiAl) and are distributed uniformly in it. It was found that microgravity leads to a decrease in the average TiB 2 particle size, while higher volume fraction of NiAl component in the material leads to the formation of coarser reinforced particulates. The mechanism of structure formation of different MMCs during CS was identified by using the quenching technique. For example, it was shown that TiB 2 grains appear due to crystallization from the complex (Ni-Al-Ti-B) liquid solution formed in the combustion front. An overall decrease of microstructural transformation rates was observed under microgravity.

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Section: Kinetics Of Tib 2 Particles Growth In Intermetallic Matrixmentioning

confidence: 62%

Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity

et al. 2001

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“…On the other hand, the so‐called “validation” of a simulation is important for its use in technical applications like optimizing sintering schedules, compensating of costly distortions due to inhomogeneous density distributions after compacting, or the prediction of large pores or cracks. Successful work has been reported, for example, by German and colleagues, 64,65 by Olevsky and colleagues, 66–69 and particularly by Riedel and colleagues, 70–78 among others. Although simplifying assumptions on the geometry and the transport processes have been used, this approach was shown to be of high value in sintering technology.…”

Section: Numerical Modellingmentioning

confidence: 95%

Particle Rearrangement and Pore Space Coarsening During Solid‐State Sintering

Exner

Müller

2009

Journal of the American Ceramic Society

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Coarsening of porosity during sintering has been observed in powder compacts of metallic, ceramic, and amorphous materials. Monitoring and modelling of the growth of individual (closed) pores in the late sintering stages are well established. Porosity is interconnected up to very high densities. Coarsening of the continuous pore space takes place during the initial and intermediate sintering stages. This coarsening is caused by localized transport of atoms or molecules (diffusion or viscous flow) as well as by bulk particle movement (rearrangement). Its quantitative exploration poses problems both experimentally and theoretically. Ways to characterize the geometry of the interconnected pore space and of closed pores are discussed with emphasis on stereological parameters. Recent and classical approaches, experimental findings with 2D model arrangements (as the formation and opening up of particle contacts, pore coarsening, and particle rearrangement) and some advances of computer simulations are discussed together with open questions.

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Coupled Densification—Shape Distortion Analysis of Liquid Phase Sintering Affected By Gravity

Alvarado-Contreras

German

Maximenko³

et al. 2013

Metall Mater Trans A

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Shape distortion induced by gravity in the initial stage of solid phase sintering

Cited by 9 publications

References 1 publication

Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity

Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity

Particle Rearrangement and Pore Space Coarsening During Solid‐State Sintering

Coupled Densification—Shape Distortion Analysis of Liquid Phase Sintering Affected By Gravity

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Shape distortion induced by gravity in the initial stage of solid phase sintering

Cited by 9 publications

References 1 publication

Mechanistic studies in combustion synthesis of NiAl–TiB2 composites: Effects of gravity

Mechanistic studies in combustion synthesis of NiAl–TiB2 composites: Effects of gravity

Particle Rearrangement and Pore Space Coarsening During Solid‐State Sintering

Coupled Densification—Shape Distortion Analysis of Liquid Phase Sintering Affected By Gravity

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Product

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Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity

Mechanistic studies in combustion synthesis of NiAl–TiB₂ composites: Effects of gravity