Determination of pore mobility during sintering

Journal Article · Fri Dec 31 23:00:00 EST 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02646677· OSTI ID:5265455

Liu, Y; Patterson, B R ^[1]

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1. Univ. of Alabama, Birmingham, AL (United States). Dept. of Materials Science and Engineering

The mobility of pores being dragged by grain boundaries has been modeled in terms of shape-independent microstructural parameters measurable by stereological means. The derived mobility is expressed with respect to the amount of porosity per unit area of grain boundary and the driving pressure for grain boundary and pore motion, i.e., as velocity per unit driving pressure. The resultant mobility for pore surface diffusion-controlled motion is found to be inversely proportional to the mean-pore intercept, regardless of pore shape and volume fraction. Solutions for lattice and vapor transport yield mobilities independent of pore size but inversely proportional to pore volume fraction. Computed pore mobilities, assuming surface diffusion-controlled motion, during final-stage sintering of copper and tungsten are shown to decrease with densification. In one case, mobility was found to increase during early densification, prior to the final stage. These results are explained with reference to the simultaneous changes occurring in grain boundary and pore surface areas during densification.

• OSTI ID: 5265455
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:1; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
COPPER
DATA
ELEMENTS
FABRICATION
INFORMATION
MATHEMATICAL MODELS
METALS
MICROSTRUCTURE
NUMERICAL DATA
POROSITY
SINTERING
THEORETICAL DATA
TRANSITION ELEMENTS
TUNGSTEN