Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering
Pavlović, Vera P.
Pavlović, Vladimir B.
Article (Accepted Version)
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Sintering of pure cordierite 2MgO:2Al2O3:5SiO2, and cordierite with the addition of 5 mass % TeO2 was studied. Green bodies were prepared from powder mixtures mechanically activated in a high-energy planetary mill, shaped by uniaxial (20 MPa) and cold isostatic pressing (1000 MPa). The pressure-less sintering of these specimens was performed at 1350°C for 1 h. High relative density over 95% of the theoretical value was obtained through solid-state reaction and pressure-less sintering of powder activated for 40 min, and for the first time reported in the literature. Phase composition and microstructures of sintered samples were determined by XRD and SEM, coupled with EDS mapping. The real part of the complex relative permittivity of the samples was measured at 200 MHz. The loss tangent of all samples was below the resolution of the measurement setup. A strong correlation between the relative permittivity and the density agrees with previously published data.
Keywords:cordierite / electrical properties / mechanical activation / sintering / TeO2
Source:Advances in Applied Ceramics, 2019, 118, 5, 241-248
- Taylor and Francis
- Directed synthesis, structure and properties of multifunctional materials (RS-172057)
- National Science Foundation, North Carolina State University, Project No. HRD-1345219
- United States National Science Foundation (NSF) / Partnerships for Research and Education in Materials (PREM), Grant 1523617
- United States National Aeronautics and Space Administration (NASA), Grant NNX09AV07A
- Czech Science Foundation (GACR) - 17-05620S
- Ministry of Education, Youth and Sports (MEYS) of Czech Republic - CEITEC 2020 [LQ1601]
- This is the peer-reviewed version of the article: Obradović, N., Pavlović, Vera, Kachlik, M., Maca, K., Olćan, D., Đorđević, A., Tshantshapanyan, A., Vlahović, B., Pavlović, Vladimir, 2018. Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering. Advances in Applied Ceramics. https://doi.org/10.1080/17436753.2018.1548150