Aluminium acetate as alternative cross-linker for temperature controlled gel-casting and joining of ceramics

Brandes, Christoph; Antink, Marieke M. Hoog; Kroll, Stephen; Treccani, Laura; Rezwan, Kurosch

doi:10.1016/j.jeurceramsoc.2015.12.011

Cited by 4 publications

(4 citation statements)

References 38 publications

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“…The “‐” in the middle of the “A” was done separately by stacking gelled layers to form a shorter composite plate, which was later joined with the outer part of the “A” using additional slurry. This shows another very interesting feature of this processing method, as it demonstrates how ionotropic gelation can be used to join ceramics …”

Section: Resultsmentioning

confidence: 90%

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

et al. 2018

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In this communication, we present a new processing method for obtaining oxide ceramic composites based on the ionotropic gelation technique. Nextel 610 fiber fabrics were infiltrated by an alumina-zirconia suspension with a total solid content of 50 vol% and alginate as the binder. Subsequently, the suspension was slowly cross-linked by adding Al 3+ cations and transferred to a gel state. The gelled fabric layers could be easily cut, stacked and shaped, as well as joined to other ceramic materials and composites. Furthermore, the fiber content could be adjusted by pressing the layers together. In summary, the composites produced with this technique presented a very good fiber bundle infiltration, matrix with fine porosity and excellent mechanical properties. Nextel 610/alumina-zirconia composites sintered at 1200°C for 1 hour showed bending strength of 306 MPa, interlaminar shear strength of 9.8 MPa and nominal fracture toughness of 13.6 MPa m 0.5 .How to cite this article: Almeida RSM, Pereira TFS, Tushtev K, Rezwan K. Obtaining complex-shaped oxide ceramic composites via ionotropic gelation.

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Section: Resultsmentioning

confidence: 90%

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

et al. 2018

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“…The elongated grains are the most effective morphology to deflect the propagation cracks in the microspheres, by twisting the crack front in between the powder particles [48]. Highest crushing strength of 185 MPa was obtained for the AS-MS, despite the AGG of Al2O3 in the mullite and amorphous calcium aluminium silicate [49].…”

Section: Microsphere Propertiesmentioning

confidence: 99%

Versatile use of droplet coagulation: Shaping fine-grained SiO 2 and Al 2 O 3 waste streams into monodisperse microspheres

Pype

Michielsen

Mullens

et al. 2017

Sustainable Materials and Technologies

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The versatile use of droplet coagulation to recycle complex waste resources (fly ash FA, rice husk ash RHA and alum sludge AS) was investigated. Monodisperse microspheres were shaped, creating higher impact on the applicability of the waste resources. In order to obtain a suspension with appropriate rheological properties, pre-processing was required for the AS powder in contrast to the RHA and FA powders. Furthermore, the impact of the shaping process and waste stream properties on the calcination and sintering was determined and correlated to the microstructure of the sintered spheres. The porosity of the sintered AS microspheres was significantly lower (4%) as compared to the FA (50%) and RHA (67%) microspheres. Consequently, the crushing strength of the sintered microspheres varied for the different waste resources. Due to the enhanced densification, the highest crushing strength (185 MPa) was obtained for the AS microspheres.

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“…Ionotropic gelation presents several advantages over traditional slurry infiltration methods, such as: the control of the slurry viscosity with the gelling reaction, a relatively high ceramic particle content of the slurry, a low content of binder and flexible shaping possibilities 17 . Furthermore, previous works from our research group showed that this technique can be used to join monolithic ceramics in the green state 18 . Therefore, the focus of this work is to further develop this technique and to investigate its capabilities regarding the joining of Ox‐CMCs.…”

Section: Introductionmentioning

confidence: 99%

“…17 Furthermore, previous works from our research group showed that this technique can be used to join monolithic ceramics in the green state. 18 Therefore, the focus of this work is to further develop this technique and to investigate its capabilities regarding the joining of Ox-CMCs. For that, composite plates containing Nextel 610 fibers and alumina-zirconia matrix (N610/AZ) were produced.…”

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confidence: 99%

Joining oxide ceramic matrix composites by ionotropic gelation

Almeida

Farhandi

Tushtev

et al. 2020

Int J Applied Ceramic Tech

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The production of complex‐shaped all‐oxide ceramic matrix composites (Ox‐CMC) is somewhat restricted by their current processing methods, as well as by the lack of applicable joining techniques. Thus, we present a new method for joining Ox‐CMCs based on the gelation of slurries with the polysaccharide polymer alginate. For this investigation, Nextel 610/alumina‐zirconia composites were produced using alginate as binder and aluminum acetate as gelling agent. The joining capabilities of this technique were investigated with microstructural analyses and single‐lap compression shear tests. For that, a slurry‐containing alginate was used to join two composite plates at different stages of the processing: gel state, dried green body and after sintering. Joining composites plates in their gel or green state was successful as the joints showed shear strength values similar to the interlaminar shear strength of the composites plates. The quality of the joints was attributed to the interactions between the alginate chains of the composite plates and the joint. We also show that even the joining of already sintered Ox‐CMCs is feasible. However, densification cracks and lower shear strength are observed for such cases.

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Aluminium acetate as alternative cross-linker for temperature controlled gel-casting and joining of ceramics

Cited by 4 publications

References 38 publications

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

Versatile use of droplet coagulation: Shaping fine-grained SiO 2 and Al 2 O 3 waste streams into monodisperse microspheres

Joining oxide ceramic matrix composites by ionotropic gelation

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