The influence of compaction pressure on the density and electrical properties of cordierite-based ceramics

Obradović, Nina; Đorđević, Nataša; Peleš, Adriana; Filipović, Suzana; Mitrić, Miodrag; Pavlović, Vladimir B.

doi:10.2298/sos1501015o

Cited by 10 publications

(13 citation statements)

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“…The process of mechanical activation as a pre-sintering powder preparation, in order to produce homogeneous mixtures, with uniform distribution of powder particles, to increase specific surface areas of particles, to make them more reactive and capable of new phase formation, and, finally, to decrease the sintering temperatures, is commonly used in ceramic processing [8]. Furthermore, this low-cost method has more advantages compared to other powder processing routes, such as shorter time of preparation, simplicity of method itself, and possibility of obtaining large quantities of the powder.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…Refractory coatings and their production processes were designed according to the works [3,8,22], our works [24,26] and domestic norms [43,44]. Based on the analysis of the mechanical activation influence on the filler grain size and shape [27,[28][29][30][31][32][33] as well as of the filler grain size influence on coating suspension sedimentation stability [3,7], cordierite-based, mechanically activated fillers were chosen: first filler C 2 (100% -20 x10 -6 m) and the second combination of fillers C 2 (100% -20x 10 -6 m) and C 3 (100% -12 x10 -6 m). In reference to the filler grain size chosen, two series of the Lost Foam refractory coatings were designed as follows: coating with filler C 2 (marked: A) and coating with combination of fillers C 2 + C 3 (marked: B), which were corrected according to test results for the coating suspensions obtained.…”

Section: Synthesis Of Lost Foam Refractory Coatings With Activated Fimentioning

confidence: 99%

“…Design of cordierite-based refractory coatings and choice of production method were carried out in accordance with the analysis of the influence of mechanical activation of non-metallic mineral raw materials on the filler's quality, i.e. on the grain size and shape of the filler, according to the works [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical activation of a cordierite -based filler on sedimentation stability of lost foam refractory coatings

Pavlović¹,

Andrić

Radulović

et al. 2019

Sci Sintering

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For the development of the Lost Foam refractory coatings with controlled rheologic properties, the influence of the mechanical activation process on the cordierite-based filler's properties change was examined. First of all, the test referred to the change of filler particles' size and shape, as well as to dispersion ability and stability of the coating suspension. Cordierite was obtained by synthesis in a solid state, out of the mass consisting of kaoline, alumina, quartz, sepiolite. For characterization purposes, the following methods were used: X-ray diffraction, differential thermal analysis, SEM and optical microscopy. Mechanical activation of filler was performed in a vibrating mill. The upper boundary of the grain size was 100%-30 x 10-6 m, the times were (min): 15; 30; 60. The new composition of Lost foam refractory coatings has been developed with a change of the coating production process, as well. These newly synthesized coatings proved to be effective in terms of a positive influence on a surface quality, structural and mechanical properties of aluminium castings. Test results may be useful to have the Lost Foam refractory coatings specified together with other process parameters used for the production of castings according to this casting method.

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“…Besides J.H. Lee [23]; mention that solid loading, sintering temperature; but also compaction and molding pressure [24][25] are processing variables to determine the characteristics as microstructure, porosity and mechanical properties; of sintered porous ceramic materials.…”

Section: Microstructure Of Green Bodiesmentioning

confidence: 99%

Influence of corn flour as pore forming agent on porous ceramic material based mullite: Morphology and mechanical properties

et al. 2016

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Porous material was processed by the mixing, molding and pressing the ceramic material, afterward burnout and sintering; through the forming porous, using corn flour at different concentration (10, 15 and 20 wt.%) as a pore forming agent; in order to determinate the influence of porous on the mechanical, morphological and structural properties. The effect of the volume fraction of corn flour in the mullite matrix, at various sintering temperature from 1100, 1200, 1300 and 1500 o C were tested by Diffraction X ray, showing changes in crystalline phases of mullite (3Al 2 O 3-2SiO 2), as result of sintered temperatures. Presence of talcum powder in formula, also cause the formation of the cordierite and cristobalite crystalline phases, giving stability and adhesion to the structure of ceramic material. When sintering at temperatures between 1300 to 1500 o C, and it was used the concentration of corn flour 15-20 wt.% as forming agent porous, it was found the better mechanical properties. The scanning electron microscopy analysis shows the presence of open porosity and anisotropy.

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The influence of compaction pressure on the density and electrical properties of cordierite-based ceramics

Cited by 10 publications

References 0 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

Influence of mechanical activation of a cordierite -based filler on sedimentation stability of lost foam refractory coatings

Influence of corn flour as pore forming agent on porous ceramic material based mullite: Morphology and mechanical properties

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