Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering

Processing and properties of dense cordierite ceramics obtained through solid-state reaction and pressure-less sintering

WoS Article

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 solidstate 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.

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 solidstate 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.

Mechanical activation; sintering; electrical properties; cordierite; TeO2

Mechanical activation; sintering; electrical properties; cordierite; TeO2

OBRADOVIĆ, N.; PAVLOVIĆ, V.; KACHLÍK, M.; MACA, K.; OLĆAN, D.; DORDEVIĆ, A.; TSHANTSHAPANYAN, A.; VLAHOVIĆ, B.; PAVLOVIĆ, V.

2020

04.07.2019

1743-6753

Advances in Applied Ceramics

118

5

United Kingdom of Great Britain and Northern Ireland

241

248

8

https://www.tandfonline.com/doi/full/10.1080/17436753.2018.1548150