liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Filling induced density variations in metal powder
Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Department of Quality Technology, Luleå University of Technology, Luleå, Sweden.
2002 (English)In: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 45, no 2, 146-153 p.Article in journal (Refereed) Published
Abstract [en]

Filling induced density variations is a problem that has long been overlooked by powder metallurgy scientists. In this paper,densityvariations are addressed, both why they occur and what problems they may cause. A test method, including a test rig, is presented that is able to link several different factors to resulting powder densities. The relations are analysed and several density affecting mechanisms are suggested. These mechanisms could be used either to minimise density differences within parts or to control density by directing powder to critical areas.

Place, publisher, year, edition, pages
2002. Vol. 45, no 2, 146-153 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-30012DOI: 10.1179/003258902225002578ISI: 000176949500025Local ID: 15456OAI: oai:DiVA.org:liu-30012DiVA: diva2:250831
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
In thesis
1. Studies of density variations in iron powder caused by the filling operation
Open this publication in new window or tab >>Studies of density variations in iron powder caused by the filling operation
2001 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Detailed information about the density within a part produced by compression of a granular material is perhaps the most important piece of information you need if you are to predict its properties. Nearly all mechanical properties are strongly dependent on the density and the density of a very small region within the part can potentially be disastrous if it has a density level considerably lower then the rest of the part. Filling induced density variations is a problem that long has been overlooked by powder metallurgy scientists. One of the factors that are making investigations difficult is the lack of methods to make experimental data available. In this work four different methods for this purpose have been evaluated.

Metallographic examinations

Has proven to be a reliable method to provide information about the density variations in cut, 2 dimensional cross sections of PM samples. To produce the amount of data necessary to study the filling operation is however considered too labour intensive.

Bulk densitv measurements of compressed samples

A simple and reliable method, perfect for thorough investigations of densityvariations in industrially produced PM components.

Density measurements of filled powder

Although not as accurate as bulk density measurements the increased flexibility of this method can be an advantage when investigating filling behaviour. A novel test rig was constructed that was able to identify and link several different factors to the resulting density variations.

Computerised Tomography

This method has the potential to deliver the same information as metallographic examinations in a much faster and more reliable way. It has however not yet been established if the accuracy ofthe method is sufficient to provide information about the density variation in PM samples caused by the filling operation.

With the bulk density and the filled powder methods deeper studies were also performed to increase the knowledge of powder filling behaviour. It has been established that the filling operation causes density variations within PM parts and that these variations are highly systematic. With the construction of the test rig it was possible to determine several aspects of the feed shoe cycle as responsible for these variations.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2001. 18 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 905
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-30050 (URN)15510 (Local ID)91-7373-122-6 (ISBN)15510 (Archive number)15510 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-11-28

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
Engineering MaterialsThe Institute of Technology
In the same journal
Powder Metallurgy
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 493 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf