Apparent viscosity of W–Cu powder compacts during sintering

The apparent rigidity of W–Cu (35 vol.%) powder compacts during sintering is characterised from the determination of axial viscosity by dilatometry under sequential loading. The study is carried out on composite powders containing submicron size phases, in the temperature range 1020–1100 °C in which...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2004-10, Vol.383 (2), p.390-398
Main Authors: Doré, F., Martin, C.L., Allibert, C.H.
Format: Article
Language:English
Subjects:
Apparent viscosity
Applied sciences
Densification
Exact sciences and technology
Metal powders
Metals. Metallurgy
Powder metallurgy. Composite materials
Processes
Production techniques
W–Cu
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The apparent rigidity of W–Cu (35 vol.%) powder compacts during sintering is characterised from the determination of axial viscosity by dilatometry under sequential loading. The study is carried out on composite powders containing submicron size phases, in the temperature range 1020–1100 °C in which a significant shrinkage is evidenced by conventional dilatometry. When the sintering bodies density increases from 0.5 to 0.74 d th, the axial viscosity increases from 10 3 to 13 × 10 3 MPa s in solid state and from 0.5 × 10 3 to 4 × 10 3 MPa s when Cu is liquid. These rather low values do not indicate the formation of a rigid W particle network. From about 1060 to 1100 °C, the rapid shrinkage, the low axial viscosity and the significant microstructure change support a densification process by rearrangement by viscous flow.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2004.05.050