Opportunities of porous ceramics fabricated by gelcasting in mitigating environmental issues

Takahashi, Minoru; Menchavez, Ruben L.; Fuji, Masayoshi; Takegami, Hiroaki

doi:10.1016/j.jeurceramsoc.2008.07.030

Cited by 57 publications

(29 citation statements)

References 15 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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“…One of the main stages in the preparation of ceramic elements is forming process including an appropriate selection of organic additives. Literature data concerning shaping methods show that ceramic materials are recently willingly fabricated by colloidal processes [6,7]: gelcasting [8], slip casting [9], tape casting [10,11] mechanical foaming [12], direct coagulation casting [13], dip coating [14], etc.…”

Section: Introductionmentioning

confidence: 99%

Colloidal processing of Al2O3 and BST materials

Pietrzak

Wiecińska

Pawlikowska

et al. 2017

J Therm Anal Calorim

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The paper presents the analysis of thermal stability and decomposition of Al 2 O 3 and (Ba,Sr)TiO 3 green bodies as well as commercially available organic additives which are used in shaping of ceramics by colloidal processing. The first analyzed ceramic material was Al 2 O 3 green body obtained by gelcasting. The second examined material was elastic ceramic-polymer composite based on ferroelectric powder Ba 0.8 Sr 0.2 TiO 3 with NiO obtained by tape casting method. This flexible and durable material is characterized by high value of dielectric constant and finds the application in devices operating at very high frequencies up to sub-THz. Most organic additives are indispensable just in forming step but must be then eliminated in order to obtain pure ceramic phase, additionally some of them have to be stable in a wide temperature range. The analyzed organic substances were as follows: 2-carboxyethyl acrylate, SYNTRAN 8250, DURAMAX D-3005, DURAMAX B-1000. The DTA/TG measurements coupled with mass spectrometry allowed to gain new knowledge concerning degradation of selected organic additives, thermal stability of ceramic-polymer composite and type of gases released from samples during thermal treatment.

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“…Nowadays the use of curing and gelation processes allow to obtain both dense ceramics, from large three-dimensional samples to thin tapes [6][7][8] and porous samples [9,10]. The most popular shaping methods based on in situ polymerization are for example: gel-tape casting [11], gel-electrophoresis [12], aqueous injection moulding [13] or mechanical foaming coupled with gelcasting [14]. Polymerization process is also widely used in freeform fabrication techniques based on UV-curing [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Organic additives in gel-tape casting of ceramic powders – A novel approach to the problem of elasticity and cracking of thin tapes

Wiecińska

Graule

Bachonko

2015

Journal of the European Ceramic Society

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Opportunities of porous ceramics fabricated by gelcasting in mitigating environmental issues

Cited by 57 publications

References 15 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

Colloidal processing of Al2O3 and BST materials

Organic additives in gel-tape casting of ceramic powders – A novel approach to the problem of elasticity and cracking of thin tapes

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