Comparison of aqueous and non-aqueous tape casting of fully stabilized ZrO2 suspensions

Michálek, Martin; Blugan, Gurdial; Graule, Thomas; Kuebler, Jakob

doi:10.1016/j.powtec.2015.01.036

Cited by 29 publications

(15 citation statements)

References 21 publications

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“…The number of different organics needed in a shaping process ranges from two to eight. The organic substances can play the role of dispersing agents which stabilize suspensions [7][8][9], binders which hold particles together [10], plasticizers which give elasticity [11], foaming agents which allow to obtain porous materials [12], monomers [13] together with activators [14] and initiators of polymerization [15] which allow to create polymeric network around non-plastic particles, etc. Organic additives are subsequently burned out during sintering process.…”

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 casting thicknesses. Compared with non-reactive aqueous and non-aqueous tape casting systems, which have a shrinkage of around 20% [9]. This represents an amelioration of 65% in the shrinkage reduction.…”

Section: Macro and Micro Propertiesmentioning

confidence: 98%

“…These negative consequences include longer drying time, higher crack sensitivity and that some raw materials can react adversely with the water [7]. In addition, the replacement of organic solvents by water has a strong influence on the rheological behavior of the slurry due to higher surface tension [8,9].…”

Section: Introductionmentioning

confidence: 99%

Aquacasting—A new shaping concept for water based reactive tape casting

Durif

Frömder

Affolter

et al. 2015

Journal of the European Ceramic Society

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“…Due to environmental and safety issues, the use of water‐based systems is increasing in importance . Nevertheless, the replacement of organic solvents by water presents some challenges in controlling the rheological and drying behavior of the slurry . In addition, some raw materials, particularly nonoxides, can react adversely with water .…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18] Nevertheless, the replacement of organic solvents by water presents some challenges in controlling the rheological and drying behavior of the slurry. 19,20 In addition, some raw materials, particularly nonoxides, can react adversely with water. 21 Thus, organic solvent-based tape casting remains used in the industrial shaping process for producing thin, flat ceramics.…”

Section: Introductionmentioning

confidence: 99%

Tape casting of preceramic polymers toward advanced ceramics: A review

Hotza

Nishihora

Machado

et al. 2019

Int J Ceramic Engine & Sci

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In the last 20 years, tape casting, a standard wet‐shaping process to produce thin ceramics, has been applied to manufacture polymer‐derived ceramics (PDCs). Si‐based polymers, such as polysiloxanes and polysilazanes, also known as preceramic polymers (PCPs), have been used as precursors/binders replacing conventional raw materials and additives for tape casting process. Thermal processing of PCPs is carried out at lower temperatures in comparison with classical ceramic sintering, particularly of carbides and nitrides. Furthermore, polymeric precursors can be converted into hybrid or composite ceramics, when parts of the polymers remain unreacted. Inert or reactive fillers might be used to reduce both shrinkage and porosity inherently caused by the weight loss occurring during polymer pyrolysis while forming new ceramic phases in the final materials. Alternatively, pore formers might also be added to tailor pore shape, connectivity, and volume (macroporosity). Nevertheless, current equipment and process parameters for tape casting‐based products must be eventually adjusted to fit the characteristics of ceramic precursors. Therefore, the aim of this review is focused on listing and discussing the efforts to produce PDCs using tape casting as a shaping technique. Interactions of system components and effects of treatment, particularly thermal stages, on final microstructure and properties are stressed out. Gaps in the literature concerning processing optimization are pointed out, and suggestions are given for further development of PDCs produced by tape casting.

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Comparison of aqueous and non-aqueous tape casting of fully stabilized ZrO2 suspensions

Cited by 29 publications

References 21 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

Aquacasting—A new shaping concept for water based reactive tape casting

Tape casting of preceramic polymers toward advanced ceramics: A review

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