Optimization of mechanical strength of titania fibers fabricated by direct drawing

Kelli Hanschmidt, Tanel Tätte, Irina Hussainova, Marko Part, Hugo Mändar, Kaspar Roosalu, Ioannis Chasiotis

Research output: Contribution to journalArticlepeer-review

Abstract

Nanostructured polycrystalline titania (TiO2) microfibers were produced by direct drawing from visco-elastic alkoxide precursors. The fiber crystallinity and grain size were shown to depend on post-treatment calcination temperature. Tensile tests with individual fibers showed strong sensitivity of the elastic modulus and the tensile strength to microstructural details of the fibers. The elastic modulus of as-fabricated fibers increased about 10 times after calcination at 700 â̂̃C, while the strain at failure remained almost the same at ∼1.4 %. The highest tensile strength of more than 800 MPa was exhibited by nanoscale grained fibers with a bimodal grain size distribution consisting of rutile grains embedded into an anatase matrix. This structure is believed to have reduced the critical defect size, and thus increased the tensile strength. The resultant fibers showed properties that were appropriate for reinforcement of different matrixes.

Original languageEnglish (US)
Pages (from-to)663-671
Number of pages9
JournalApplied Physics A: Materials Science and Processing
Volume113
Issue number3
DOIs
StatePublished - Nov 2013

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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