5.5 Oxide/Oxide CMCs – Porous Matrix Composite Systems; Composites With Interface Coatings

Tushtev, Kamen; Almeida, Renato S.M.

doi:10.1016/b978-0-12-803581-8.09990-2

Cited by 7 publications

(11 citation statements)

References 205 publications

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“…Hence, the occasional presence of big pores in the stacked plates resulted in lower shear strength. It should be highlighted that the mechanical properties of the obtained composites lie within the range of commercially available composite plates: nominal K IC of 8.9‐12 MPa m 0.5 and bending strengths of 160‐340 MPa . Nevertheless, the developed composites show lower fiber contents, ie, 24 vol% for stacked samples and 37 vol% for samples pressed with 0.4 MPa.…”

Section: Resultsmentioning

confidence: 66%

“…For such composites, damage tolerance is normally achieved by producing a weak matrix with a finely distributed porosity . Nowadays, Ox‐CMCs have reached enough maturity to be applied in different industrial fields like: gas turbine engines, thermal protection systems and hot gas filters . However, an even broader range of applications is still restricted by their current processing methods and the thermal stability of the available oxide fibers.…”

Section: Introductionmentioning

confidence: 99%

“…The production of Ox‐CMCs normally involves the infiltration of fiber fabrics by a pre‐ceramic fluid, followed by the densification of the matrix at high temperatures. For the infiltration step, the most common approaches seen in the literature are based on the use of aqueous slurries or sols . In order to properly infiltrate fiber bundles/fabrics and fill all the spaces between the fiber filaments, a suspension with low viscosity is generally desired.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that there are other processing methods applicable to Ox‐CMCs such as: electrophoretic deposition, polymer infiltration and reaction bonding. Nevertheless, these processes are either limited in regard to matrix chemical composition, are time consuming or lead to composites with lower mechanical properties than composites produced by slurry infiltration or colloidal route …”

Section: Introductionmentioning

confidence: 99%

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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: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

et al. 2018

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“…This fiber was chosen since it is the strongest oxide fiber commercially available, as well as being the most used reinforcement for Ox-CMCs. 2 The matrix composition was 80 wt% alumina and 20 wt% yttria-stabilized zirconia. The ceramic powders used were: alumina CT 1200 (d 50 = 1200 nm; Almatis GmbH), alumina TM-DAR (d 50 = 200 nm; Taimei Chemicals), and zirconia TZ-3YS-E (d 50 = 40 nm; Tosoh Corporation).…”

Section: Composite Processingmentioning

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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Microstructure and Mechanical Properties of a Three‐Dimensional Oxide/Oxide Composite after Long‐Term Thermal Exposure

Sun,

Tian,

Liu

et al. 2024

Adv Eng Mater

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Herein, a three‐dimensional (3D) oxide fiber reinforced oxide matrix (oxide/oxide) composite is fabricated via slurry infiltration and sintering process. Subsequently, the effects of thermal aging on the microstructure and mechanical properties of the 3D oxide/oxide composite at 900 and 1100 °C are investigated. Experimental results indicate that the thermal aging affects the matrix microstructures and fiber/matrix interface. The elastic modulus of the matrix and interfacial shear strength increases with aging temperature and time. Aging treatment at 900 °C for 100 and 300 h results in a moderate decrease in the flexural strength and fracture toughness but improves the delamination resistance, whereas that at 1100 °C for 100 h lead to a significant decrease in the flexural strength and fracture toughness. The changes in mechanical properties might be attributed to matrix densification and enhanced interfacial bonding.

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5.5 Oxide/Oxide CMCs – Porous Matrix Composite Systems; Composites With Interface Coatings

Cited by 7 publications

References 205 publications

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

Obtaining complex‐shaped oxide ceramic composites via ionotropic gelation

Joining oxide ceramic matrix composites by ionotropic gelation

Microstructure and Mechanical Properties of a Three‐Dimensional Oxide/Oxide Composite after Long‐Term Thermal Exposure

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