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
Spark Plasma Sintered 3Y-TZP/CNT composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Composites of 3 mol% yttria-doped tetragonal zirconia (3Y-TZP) reinforced with multiwalled carbon nanotubes (MWCNT) up to 2 wt% have been produced using spark plasma sintering (SPS). The theoretical densities of the studied composites were found to be between 99.4 and 97.4 %. The average grain size of the composites was decreasing with addition of MWCNT content from 174 to 148 nm. The effect of MWCNTs on the mechanical properties of 3Y-TZP has been investigated. A novel method was used for the calculation of the true fracture toughness and reported for the first time in this type of composites. It was based on producing a shallow surface sharp notch machined by ultra-short pulsed laser ablation on single edge V-notch beam specimens. Indentation fracture toughness was measured using Vickers indentation and it was found to be increasing with the addition of MWCNT content while the true fracture toughness is hardly increasing. It was concluded that the increase in the resistance to indentation cracking of the composites cannot be associated to higher true fracture toughness. Moreover, nanoindentation was measured using Berkovich nanoindenter where the contact hardness and elastic modulus were determined by Oliver-Pharr method. It was found that both properties decrease with the addition of MWCNTs.Additionally, the effect of MWCNT on the tribological properties of 3Y-TZP was also investigated. The friction coefficient (COF) was studied by performing nano- and macro-scratches using diamond Berkovich and Rockwell indenters, respectively. Furthermore, the COF and the wear rate were determined in reciprocating sliding where a zirconia ball was used as a counterpart under dry conditions using a load of 5 N and sliding distance of 100 m. The COF was found to be decreasing with increasing MWCNT content. However, in macro-scratch testing, there was a critical load over which brittle fracture sets in and its value decreases as the MWCNT content increases. The wear resistance was found to be decreasing slightly for less than 1 wt% MWCNT, while it increased strongly for the addition of 2 wt. % MWCNT under the conditions studied.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2014. , p. 99
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-18752Local ID: a27d8198-b59b-457d-a6f2-1805ad4f56ccISBN: 978-91-7583-029-2 (print)ISBN: 978-91-7583-030-8 (electronic)OAI: oai:DiVA.org:ltu-18752DiVA, id: diva2:991763
Presentation
2014-11-17, E632, Luleå tekniska universitet, Luleå, 10:15
Opponent
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-11-29Bibliographically approved

Open Access in DiVA

fulltext(10780 kB)220 downloads
File information
File name FULLTEXT01.pdfFile size 10780 kBChecksum SHA-512
c23461ff5ee5cfc2c3bb983f345ea69ffa6e463aab0e403c003c19217abe7f230f73fcff7706c0cec227ec338fa46c09cebe671c7cf310b2bfe30154368f8560
Type fulltextMimetype application/pdf

Authority records

Melk, Latifa

Search in DiVA

By author/editor
Melk, Latifa
By organisation
Material Science
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 220 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

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 369 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