Effect of Powder Processing on the Sintering Mechanisms of Carbonyl and Water-atomized Iron Powders
Paper i proceeding, 2016

Metal injection molding (MIM) is an attractive alternative for net-shape manufacturing of components with high demands on shape complexity. Spherical powders with small particle sizes and a wide size distribution are generally preferred for MIM parts. In this study, the sintering behavior of an annealed spherical carbonyl iron powder, a standard carbonyl iron, and a sieved (-45 µm) water-atomized iron powder was investigated. Injection molded compacts made from the respective powders were sintered in a dilatometer in a hydrogen atmosphere to study the shrinkage behavior. The shrinkage of the powder during heating stage was related to the surface area, morphology and surface chemistry of the powders. Surface composition of the powders was studied by X-ray photoelectron spectroscopy (XPS) and high-resolution scanning electron microscopy (HR SEM) combined with energy dispersive X-ray analysis (EDX). Results show strong correlation between the sintering activity to the surface chemical composition of the powder and surface area.

carbonyl iron powder

surface composition

water-atomized iron powder

sintering

powder morphology

densification

Författare

Johan Wendel

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Ruslan Shvab

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Seshendra Karamchedu

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Dmitri Riabov

Hoganas

Sigurd Berg

Hoganas

World Powder Metallurgy 2016 Congress and Exhibition, World PM 2016; Hamburg; Germany; 9 October 2016 through 13 October 2016

Styrkeområden

Produktion

Materialvetenskap

Ämneskategorier

Metallurgi och metalliska material

ISBN

978-189907248-4