Fabrication of textured alumina by magnetic alignment via gelcasting based on low-toxic system

Szudarska, Agnieszka; Mizerski, Tadeusz; Sakka, Yoshio; Suzuki, Tohru; Szafran, M.

doi:10.1016/j.jeurceramsoc.2014.05.017

Cited by 19 publications

(8 citation statements)

References 33 publications

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“…The appropriate selection of additives is especially important in case of colloidal processing [1], in methods like: slip casting [2], gelcasting [3,4], tape casting [5], and mechanical foaming [6]. The number of different organics needed in a shaping process ranges from two to eight.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of organic additives used in colloidal shaping of ceramics investigated by the coupled DTA/TG/MS analysis

Wiecińska

2015

J Therm Anal Calorim

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The paper presents the analysis of thermal decomposition of selected organic additives, which are commonly used in shaping of ceramic materials by colloidal methods. Shaping of ceramics requires using different additives which then are burned out during sintering process. For this reason, the knowledge about thermal degradation of organics used, as well as decomposition products, seems to be very important from the application point of view. The analyzed substances were as follows: diammonium hydrocitrate, citric acid, ammonium salt of acrylic polymer, L-ascorbic acid, N,N,N 0 ,N 0 -tetramethylethylenediamine, and ammonium persulfate. The thermal analysis has been done on the apparatus coupled with mass spectrometer what allowed to observe what types of gasses are released to the atmosphere during heating. The obtained results showed important differences in thermal degradation of organic additives. It was possible to determine at what temperature regions harmful gases like N 2 O, NO 2 , or SO 2 are released from the organics and which additives can be treated as environmentally friendly.

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Section: Introductionmentioning

confidence: 99%

Thermal degradation of organic additives used in colloidal shaping of ceramics investigated by the coupled DTA/TG/MS analysis

Wiecińska

2015

J Therm Anal Calorim

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“…The energy of the magnetic anisotropy for submicron spherical alumina particles in a 10 T field exceeds the energy of thermal motion at room temperature by about an order of magnitude. This approach allows relatively high degrees of crystalline orientation [7][8][9][10], but it is not truly practical because a 10 T field can only be applied over small volumes, thus severely limiting sample sizes.…”

Section: Conventional Magnetic Alignmentmentioning

confidence: 99%

3D crystallographic alignment of alumina ceramics by application of low magnetic fields

Соколов

Harris

2018

Journal of the European Ceramic Society

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A B S T R A C TNon-cubic crystals exhibit anisotropic physical and functional properties. Microscopic crystallites as constituents of polycrystalline materials are randomly oriented, thus polycrystalline ceramics lack the anisotropic properties of their monocrystalline counterparts. We propose a technology that exploits the synergy between magnetic alignment and colloidal ceramics processing, and enables to independently tune the orientation of grains in different sample regions by infinitesimal magnetic fields (< 10 mT). The grain pivot mechanism enables the emulation of single crystals, as well as the creation of large complex-shaped ceramic elements with designed crystallographic landscapes and spatially and directionally tuned properties. Ultra-high magnetic response arises from magnetic shape anisotropy of platelet-shaped seed crystallites coated with small amounts of iron oxide nanoparticles. To control crystallographic growth directions during subsequent annealing procedures, the seeds are dispersed and aligned in a matrix of chemically identical, but much finer spherical particles. This technology opens an avenue to remarkably improve structural and functional properties of ceramic elements employed in numerous industrial applications.

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“…Texturing of ceramic materials by colloidal processing is one of these techniques. Colloidal processing has been extensively investigated for net shaping methods such as gel casting [1][2][3], electrophoretic deposition [4,5] and slip casting [4,[6][7][8][9]. Controlled conditions of the starting powder, slurry preparation, organic additive removal and sintering resulted in high-quality dense ceramic materials for industrial, medical and commercial use.…”

Section: Introductionmentioning

confidence: 99%

“…Texture of ceramic materials with interesting properties in a strong magnetic field has gained much attention recently. [2,3,5,8,9,12] The very low diamagnetic susceptibilities ( ) of ceramic materials did not make them very attractive for magnetic studies. However, the development of magnets with strong fields by the use of superconducting materials made the study of feeble diamagnetic ceramics much more appealing.…”

Section: Introductionmentioning

confidence: 99%

Texturing of hydrothermally synthesized BaTiO3 in a strong magnetic field by slip casting

Özen

Mertens

Snijkers

et al. 2016

Ceramics International

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Barium titanate powder was processed by slip casting in a rotating strong magnetic field of 9.4 tesla. The orientation factor of the sintered compact was analyzed by the X-ray diffraction technique and the microstructure (grain-size) was analyzed by scanning electron microscope. The hydrothermally prepared barium titanate was used as matrix material and the molten-salt synthesized barium titanate, with a larger particle-size, was used as template for the templated grain-growth process. Addition of large template particles was observed to increase the orientation factor of the sintered cast (5 vol% loading). Template particles acted as starting grains for the abnormal grain-growth process and the average grain-size was increased after sintering. Increasing the solid loading (15 vol%) resulted in a similar orientation factor with a decrease of the average grain-size by more than half. However, addition of templates to the 15 vol% cast had a negative effect on the orientation factor. The impingement of growing particles was stated as the primary cause of particle misorientation resulting in a low orientation factor after sintering. Different heating conditions were tested and it was determined that a slow heating rate gave the highest orientation factor, the smallest average grain-size and the highest relative density.

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Fabrication of textured alumina by magnetic alignment via gelcasting based on low-toxic system

Cited by 19 publications

References 33 publications

Thermal degradation of organic additives used in colloidal shaping of ceramics investigated by the coupled DTA/TG/MS analysis

Thermal degradation of organic additives used in colloidal shaping of ceramics investigated by the coupled DTA/TG/MS analysis

3D crystallographic alignment of alumina ceramics by application of low magnetic fields

Texturing of hydrothermally synthesized BaTiO3 in a strong magnetic field by slip casting

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