Sintering of bimodal micrometre/nanometre iron powder compacts - A master sintering curve approach
Artikel i vetenskaplig tidskrift, 2021

Though press and sinter powder metallurgy (PM) steel offers cost-effective solutions for structural applications, there is a constant drive for improvement in their density. Addition of nanopowder to the conventional micrometre-sized metal powder is explored to improve the sinter density. In this study, the effect of nanopowder addition in varying amounts has been studied. Carbonyl iron powder (<5 μm) and water atomized iron powder (<45 μm) were used as the base powder to which varying amounts of iron nanopowder (<100 nm) was added. Dilatometric sintering studies under pure hydrogen atmosphere were carried out to analyze the densification behavior. The results revealed that the bimodal powder mixture containing 25% nanopowder exhibited the highest green density for both carbonyl and ASC 300 compacts. Master sinter curve for compacts was developed based on the dilatometer data. The apparent activation energy for sintering decreased with an increase in nanopowder content. This is reflected in the values of work of sintering.

NanopowderWater atomized ferrous powderCompactionSinteringDilatometerMaster sintering curve

Författare

Swathi Kiranmayee Manchili

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Johan Wendel

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Lars Nyborg

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Powder Technology

0032-5910 (ISSN)

Vol. 391 557-568

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Nanoteknik

Styrkeområden

Produktion

Fundament

Grundläggande vetenskaper

DOI

10.1016/j.powtec.2021.06.052

Mer information

Senast uppdaterat

2021-07-22