Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics

Obradović, Nina; Filipović, Suzana; Đorđević, Nataša; Kosanović, Darko; Marković, Smilja; Pavlović, Vladimir B.; Olćan, Dragan I.; Djordjević, A.R.; Kachlík, Martin; Maca, Karel

doi:10.1016/j.ceramint.2016.05.201

Cited by 32 publications

(15 citation statements)

References 34 publications

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“…Detailed phase analysis of the starting powders obtained by means of XRD, is explained and discussed in our previous paper [10]. Based on those results, starting nonactivated mixture is consisted of MgO, SiO 2 and Al 2 O 3 peaks.…”

Section: Resultsmentioning

confidence: 95%

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Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique

Obradović¹,

Filipović²,

Đorđević³

et al. 2016

SCI SINTER

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Cordierite-based ceramic materials are attracting much interest for their various applications in industry, for manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. In this study, microstructural and electrical properties of mechanically activated MgO-Al 2 O 3 -SiO 2 system have been analyzed. The mixtures of MgO-Al 2 O 3 -SiO 2 powders were mechanically activated in a planetary ball mill for the time periods from 0 to 160 min. Morphological investigations have been performed on the obtained powders. The effects of activation and two-step sintering process on microstructure were investigated by scanning electron microscopy (SEM). Electrical measurements showed variations of the dielectric constant (ε r ) and loss tangent (tan δ) as a function of time of mechanical treatment.

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Section: Resultsmentioning

confidence: 95%

“…Finally, with prolonged sintering time (from 4 to 10 h), the increase of relative permittivity for approx. 10 % was measured [10].…”

Section: Resultsmentioning

confidence: 99%

Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique

Obradović¹,

Filipović²,

Đorđević³

et al. 2016

SCI SINTER

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“…The sample Al S -Al F _MnO 2 _SiO-65 was an exception probably due to the higher granulometry and then change to the lower SSA. The mass loss of the reference material is (again) related to the presence of manganese dioxide [20]. In relation to the milling time, all activated powders exhibit a significant reactivity enhancement according to the baseline.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mechanical Activation on the Reactivity of Composites for Flameless Heaters

Kaliyeva

Galfetti

Ongarbayev

2020

Eurasian Chem. Tech. J.

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The work is devoted to the activation of metal powder mixtures suitable for use in flameless food heaters. Four activated powders have been manufactured starting from the reference material using a standard technique. Activated powders exhibited a significant increment of the reactivity for the reference mixture. Experimental tests were carried out to characterize the resulting composites in terms of the combustion rate. The oxidation reaction at a low heating rate was monitored using a SEIKO EXTAR II thermal analysis machine and its tests were carried out at open air in temperature range starting from room temperature up to 1150 °C at the heating rate of 10 °C/min. Powders activated by mechanical activations and the initial mixture of materials were characterized in terms of apparent density, absorbed surfactant with the mass of sizing, i.e. granulometry, oxidation properties at a low heating rate. With increase the grinding time, the color of the powder switches to dark tones. Powder granulometry was performed on a MALVERN laser granulometer MASTERSIZER 2000 using dry block SCIROCCO. Three measurements for each sample were performed and the results were averaged. The tests were recorded and processed by digital technology to make the combustion rate of the powders, also the experimental setup used for investigations was presented. The sample AlS-AlF_MnO2_SiO-150 is characterized by the lowest metal content, and by the most regular combustion propagation. The powder AlS-AlF_MnO2_SiO-50 features the highest metal content, but the less regular combustion propagation. The use of mechanical activation allows increasing the number of nanoscale materials, which contributes to the synthesis of highly effective flameless food heaters.

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“…Kordijerit (2MgO+2Al2O3+5SiO2) je keramički materijal koji se primenjuje u uslovima temperaturnih šokova [9][10][11][12][13][14][15][16][17][18][19]. Ima nisku dielektričnu konstantu (~5), nizak koeficijent širenja (20·10 -7 o C -1 ), i koristi se kao nosač električnih komponenti.…”

Section: Uvodunclassified

Influence of mechanical activation on MgO-Al2O3-SiO2 system in the presence of TeO2 additive

Filipovic¹,

Obradović²,

Djordjevic³

et al. 2016

Tehnika

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Effects of mechanical activation and two-step sintering on the structure and electrical properties of cordierite-based ceramics

Cited by 32 publications

References 34 publications

Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique

Microstructural and electrical properties of cordierite-based ceramics obtained after two-step sintering technique

Effect of Mechanical Activation on the Reactivity of Composites for Flameless Heaters

Influence of mechanical activation on MgO-Al2O3-SiO2 system in the presence of TeO2 additive

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