Effects of composition and sintering time on liquid phase sintered Co-Cu samples in microgravity

Yubin He, Saiyin Ye, J. Naser, J. Chiang, J. E. Smith

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Twelve Co-Cu powder compact samples with different liquid volume fractions were processed during microgravity liquid phase sintering on a suborbital sounding rocket and three Space Shuttle missions. The processing times ranged from 2.5 minutes to 66 minutes. The samples exhibited dimension stability after sintering. Microstructural evolutions such as densification, dihedral angle, contact per grain and grain growth rates, indicated a dependency on Cu composition and sintering time. Grain growth analysis showed a diffusion-controlled grain growth mechanism. The diffusional layer was found in a microgravity processed 70vol%Co-Cu sample. A mechanism that explains the transient nature of this diffusion layer is proposed and used to explain the results at other processing times. Agglomeration and coalescence of particles were observed in this study, and the grain size distributions were in agreement with LSEM model, which incorporates the effect of higher solid volume fraction and particle coalescence. Analysis of the samples also revealed considerable pore formation and metamorphosis. Unlike the Fe-Cu samples, in which pore breakup was found, pore filling and coarsening dominate in all Co-Cu samples. The evolution of these parameters has been used to enhance the understanding of driving forces that contribute to the pore metamorphosis during liquid phase sintering in the Co-Cu system under microgravity.

Original languageEnglish
Pages (from-to)5973-5980
Number of pages8
JournalJournal of Materials Science
Volume35
Issue number23
DOIs
Publication statusPublished - Dec 2000

Fingerprint

Microgravity
Grain growth
Liquid phase sintering
Sintering
Coalescence
Particles (particulate matter)
Volume fraction
Liquids
Chemical analysis
Sounding rockets
Microstructural evolution
Space shuttles
Coarsening
Dihedral angle
Processing
Densification
Powders
Agglomeration

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Effects of composition and sintering time on liquid phase sintered Co-Cu samples in microgravity. / He, Yubin; Ye, Saiyin; Naser, J.; Chiang, J.; Smith, J. E.

In: Journal of Materials Science, Vol. 35, No. 23, 12.2000, p. 5973-5980.

Research output: Contribution to journalArticle

He, Yubin ; Ye, Saiyin ; Naser, J. ; Chiang, J. ; Smith, J. E. / Effects of composition and sintering time on liquid phase sintered Co-Cu samples in microgravity. In: Journal of Materials Science. 2000 ; Vol. 35, No. 23. pp. 5973-5980.
@article{887fd8a111ee41d3917ede9fdd53f9f4,
title = "Effects of composition and sintering time on liquid phase sintered Co-Cu samples in microgravity",
abstract = "Twelve Co-Cu powder compact samples with different liquid volume fractions were processed during microgravity liquid phase sintering on a suborbital sounding rocket and three Space Shuttle missions. The processing times ranged from 2.5 minutes to 66 minutes. The samples exhibited dimension stability after sintering. Microstructural evolutions such as densification, dihedral angle, contact per grain and grain growth rates, indicated a dependency on Cu composition and sintering time. Grain growth analysis showed a diffusion-controlled grain growth mechanism. The diffusional layer was found in a microgravity processed 70vol{\%}Co-Cu sample. A mechanism that explains the transient nature of this diffusion layer is proposed and used to explain the results at other processing times. Agglomeration and coalescence of particles were observed in this study, and the grain size distributions were in agreement with LSEM model, which incorporates the effect of higher solid volume fraction and particle coalescence. Analysis of the samples also revealed considerable pore formation and metamorphosis. Unlike the Fe-Cu samples, in which pore breakup was found, pore filling and coarsening dominate in all Co-Cu samples. The evolution of these parameters has been used to enhance the understanding of driving forces that contribute to the pore metamorphosis during liquid phase sintering in the Co-Cu system under microgravity.",
author = "Yubin He and Saiyin Ye and J. Naser and J. Chiang and Smith, {J. E.}",
year = "2000",
month = "12",
doi = "10.1023/A:1026790710015",
language = "English",
volume = "35",
pages = "5973--5980",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer Netherlands",
number = "23",

}

TY - JOUR

T1 - Effects of composition and sintering time on liquid phase sintered Co-Cu samples in microgravity

AU - He, Yubin

AU - Ye, Saiyin

AU - Naser, J.

AU - Chiang, J.

AU - Smith, J. E.

PY - 2000/12

Y1 - 2000/12

N2 - Twelve Co-Cu powder compact samples with different liquid volume fractions were processed during microgravity liquid phase sintering on a suborbital sounding rocket and three Space Shuttle missions. The processing times ranged from 2.5 minutes to 66 minutes. The samples exhibited dimension stability after sintering. Microstructural evolutions such as densification, dihedral angle, contact per grain and grain growth rates, indicated a dependency on Cu composition and sintering time. Grain growth analysis showed a diffusion-controlled grain growth mechanism. The diffusional layer was found in a microgravity processed 70vol%Co-Cu sample. A mechanism that explains the transient nature of this diffusion layer is proposed and used to explain the results at other processing times. Agglomeration and coalescence of particles were observed in this study, and the grain size distributions were in agreement with LSEM model, which incorporates the effect of higher solid volume fraction and particle coalescence. Analysis of the samples also revealed considerable pore formation and metamorphosis. Unlike the Fe-Cu samples, in which pore breakup was found, pore filling and coarsening dominate in all Co-Cu samples. The evolution of these parameters has been used to enhance the understanding of driving forces that contribute to the pore metamorphosis during liquid phase sintering in the Co-Cu system under microgravity.

AB - Twelve Co-Cu powder compact samples with different liquid volume fractions were processed during microgravity liquid phase sintering on a suborbital sounding rocket and three Space Shuttle missions. The processing times ranged from 2.5 minutes to 66 minutes. The samples exhibited dimension stability after sintering. Microstructural evolutions such as densification, dihedral angle, contact per grain and grain growth rates, indicated a dependency on Cu composition and sintering time. Grain growth analysis showed a diffusion-controlled grain growth mechanism. The diffusional layer was found in a microgravity processed 70vol%Co-Cu sample. A mechanism that explains the transient nature of this diffusion layer is proposed and used to explain the results at other processing times. Agglomeration and coalescence of particles were observed in this study, and the grain size distributions were in agreement with LSEM model, which incorporates the effect of higher solid volume fraction and particle coalescence. Analysis of the samples also revealed considerable pore formation and metamorphosis. Unlike the Fe-Cu samples, in which pore breakup was found, pore filling and coarsening dominate in all Co-Cu samples. The evolution of these parameters has been used to enhance the understanding of driving forces that contribute to the pore metamorphosis during liquid phase sintering in the Co-Cu system under microgravity.

UR - http://www.scopus.com/inward/record.url?scp=0034499417&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034499417&partnerID=8YFLogxK

U2 - 10.1023/A:1026790710015

DO - 10.1023/A:1026790710015

M3 - Article

AN - SCOPUS:0034499417

VL - 35

SP - 5973

EP - 5980

JO - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 23

ER -