Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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
Ageing tests of cemented carbide powders: An investigation for increased quality of metal cutting inserts
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Åldringstester av hårdmetallpulver (Swedish)
Abstract [en]

In this study, the ageing effects on powder used for cemented carbide insert production are examined. Ageing is throughout this study, defined as the time dependent change of the magnetic properties: coercive field strength and saturation magnetization. Testing is done using eight different powder compositions stored in both air and in an argon cabinet for 10 weeks, where sampling is done at specific intervals. Samples are stored in vacuum sealed bags for a combined sintering at the last phase of the test. Magnetic properties are assumed to be dependent on the amount of oxides needed to be reduced by taking carbon from the material itself during the vacuum stage of the sintering. To achieve interpretive results, this study also tested available sintering furnaces (DMK and DEK) by sintering trays with patterns of test pieces. This shows that DEK furnaces are much better for the ageing tests performed in this study, since less variation of the magnetic properties are measured because of the symmetrical heat gradient over each tray. Ageing tests strongly suggest that the cause of ageing comes from water absorbed by the PEG in the powder composition. Changing the molecular weight of the PEG seems to have an effect on the powder's ageing sensitivity. Measurements performed in this study show less ageing for Cr-rich DA-powders than for cubic carbide rich DQ-powders.

Place, publisher, year, edition, pages
2018. , p. 42
Series
UPTEC Q, ISSN 1401-5773 ; 18022
Keywords [en]
cemented carbide, ageing, PEG, water absorption, sintering, DEK, DMK, coercivity, saturation magnetization
Keywords [sv]
Hårdmetall, åldring
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-355320OAI: oai:DiVA.org:uu-355320DiVA, id: diva2:1228542
External cooperation
SANDVIK Coromant
Subject / course
Material
Educational program
Master Programme in Materials Engineering
Supervisors
Examiners
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved

Open Access in DiVA

fulltext(2045 kB)48 downloads
File information
File name FULLTEXT01.pdfFile size 2045 kBChecksum SHA-512
a02d367f2454b3a19b46ba6da891759a24dd28e5be17884eb7197bde006c82755372fe3173feba0b4d63da6b84c84e94b0859c82d4f07c604a5d763afba284d3
Type fulltextMimetype application/pdf

By organisation
Applied Materials Sciences
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 48 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 201 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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