Dimensional changes during liquid phase sintering of fe–cu compacts

Authors: Tabeshfar, K. and Chadwick, G.A.

Journal: Powder Metallurgy

Volume: 27

Issue: 1

Pages: 19-24

eISSN: 1743-2901

ISSN: 0032-5899

DOI: 10.1179/pom.1984.27.1.19

Abstract:

Three types of commercially used iron powder of different specific surfaces and compressibilities were cold compacted with 10wt-%Cu over a range of pressures before sintering at a temperature of 1140°C. A study of dimensional changes during sintering showed that swelling was inversely related to the specific surface of the powder, but directly proportional to the compacting pressure. Metallographie, dilatometric, and microprobe studies showed that the observed swelling in the compacts was almost totally due to grain boundary penetration by liquid Cu, while diffusion of Cu into grains made only a small contribution. However, analyses of the relevant experimental parameters have shown that the particle internal micropores are energetically more favourable for attracting and accommodating the liquid Cu than the grain boundaries, and therefore, when present, they inhibit volumetric growth. In support of the above, it has been shown that the vol.%, change for various powders compacted over the range of pressures can be represented, through a single curve, in terms of the volume of micropores within the particles that remain open after compaction. © 1984 Maney Publishing.

Source: Scopus

Preferred by: Kamran Tabeshf

DIMENSIONAL CHANGES DURING LIQUID-PHASE SINTERING OF FE-CU COMPACTS

Authors: TABESHFAR, K. and CHADWICK, G.A.

Journal: POWDER METALLURGY

Volume: 27

Issue: 1

Pages: 19-24

ISSN: 0032-5899

DOI: 10.1179/pom.1984.27.1.19

Source: Web of Science (Lite)