Towards high strength SrTiO3-based composites fabricated at room temperature
Jabr, Abdullah; Kuzmić, Nina; Škapin, Srečo Davor; Jantunen, Heli; Nelo, Mikko; Spreitzer, Matjaž; Bermejo, Raul (2024-07-24)
Elsevier
24.07.2024
Jabr, A., Kuzmić, N., Škapin, S. D., Jantunen, H., Nelo, M., Spreitzer, M., & Bermejo, R. (2024). Towards high strength SrTiO3-based composites fabricated at room temperature. Journal of the European Ceramic Society, 44(15), 116782. https://doi.org/10.1016/j.jeurceramsoc.2024.116782.
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© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202408095289
https://urn.fi/URN:NBN:fi:oulu-202408095289
Tiivistelmä
Abstract
This paper explores the effect of the binder phase on the mechanical strength of room temperature fabricated (RTF) SrTiO3 ceramic composites. Lithium molybdate-strontium titanate (Li2MoO4-SrTiO3) and sodium silicate-strontium titanate (Na2SiO3-SrTiO3), along with their corresponding single-phase materials, were investigated. A comparison with single-phase high temperature sintered counterparts was also conducted. The biaxial strength of RTF Na2SiO3-SrTiO3 was seven times higher than that of Li2MoO4-SrTiO3 composites (i.e. 77 MPa to 11 MPa), resulting in ca. 40 % of the strength of single-phase SrTiO3 sintered at high temperature (i.e. ∼200 MPa). The relatively high strength of RTF Na2SiO3-SrTiO3 is related to the polycondensation of (SiO4)4- monomers in Na2SiO3 aqueous solution. This yields stronger bonding of Na2SiO3 with SrTiO3, as evidenced by wettability tests, supported by spectroscopy and fractographic analyses. The understanding of how the binder phase affects densification of ceramics fabricated at room temperature may lead to functional ceramic composites with enhanced structural integrity.
This paper explores the effect of the binder phase on the mechanical strength of room temperature fabricated (RTF) SrTiO3 ceramic composites. Lithium molybdate-strontium titanate (Li2MoO4-SrTiO3) and sodium silicate-strontium titanate (Na2SiO3-SrTiO3), along with their corresponding single-phase materials, were investigated. A comparison with single-phase high temperature sintered counterparts was also conducted. The biaxial strength of RTF Na2SiO3-SrTiO3 was seven times higher than that of Li2MoO4-SrTiO3 composites (i.e. 77 MPa to 11 MPa), resulting in ca. 40 % of the strength of single-phase SrTiO3 sintered at high temperature (i.e. ∼200 MPa). The relatively high strength of RTF Na2SiO3-SrTiO3 is related to the polycondensation of (SiO4)4- monomers in Na2SiO3 aqueous solution. This yields stronger bonding of Na2SiO3 with SrTiO3, as evidenced by wettability tests, supported by spectroscopy and fractographic analyses. The understanding of how the binder phase affects densification of ceramics fabricated at room temperature may lead to functional ceramic composites with enhanced structural integrity.
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