Joining and mechanical testing of oxide/oxide (Nextel ™610/alumina-zirconia) ceramic composites

Akram, Muhammad Yasir; Casalegno, Valentina; Ferraris, Monica; Puchas, Georg; Krenkel, Walter; Roszeitis, Sven

doi:10.1016/j.jeurceramsoc.2019.02.020

Cited by 10 publications

(13 citation statements)

References 41 publications

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“…Focusing on oxide/oxide CMCs, namely alumina fiber reinforced oxide matrix composites, two silica‐based glass compositions (SACM and GOX) were designed and successfully tested to join different Ox/Ox using the glass‐ceramic method . Table summarizes SACM and GOX parent glasses and derived glass‐ceramics compositions, characteristic temperatures, CTE, crystalline phases, and joining process temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Glass as a joining material for ceramic matrix composites: 25 years of research at Politecnico di Torino

Ferraris

Casalegno

Smeacetto

et al. 2020

Int J of Appl Glass Sci

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A revision and update about the research activity done in the past 25 years at Politecnico di Torino (Italy) on design and testing of glasses and glass-ceramics for the joining of Ceramic Matrix Composites (CMCs) will be presented and discussed.The "glass-ceramic method" to obtain a thermo-mechanically stable joint starting from a glass will be detailed with some examples. Several new glass compositions will be presented together with their characterization and behavior as joining materials for oxide-based and nonoxide-based CMC. K E Y W O R D SCMC, glass-ceramics, joining 570 | FERRARIS Et Al.

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Section: Resultsmentioning

confidence: 99%

“…However, both SACM and GOX gave excellent mechanical strength for the joined Ox/Ox. In the case of GOX, the mechanical strength at 850°C was about 80% of the unjoined composite tested for reference …”

Section: Resultsmentioning

confidence: 99%

Glass as a joining material for ceramic matrix composites: 25 years of research at Politecnico di Torino

Ferraris

Casalegno

Smeacetto

et al. 2020

Int J of Appl Glass Sci

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“…12 Glass-ceramic joints like SACM 12 and GOX 6 show possibly higher shear strength than the joints presented here. In the works from Akram et al 6,12 the shear strength of these glass-ceramic joints could not be measured since the used Ox-CMCs plates failed due to delamination before the joint. During our experiments, it was identified that the failure was indeed in the joint area.…”

Section: Shear Strengthmentioning

confidence: 99%

“…Nevertheless, the thermal stability of these joints is still lower than commercial Ox‐CMCs. Blazing alloys oxidize at 550°C, 12 whereas the softening temperature of these glasses is around 800°C‐900°C 6 …”

Section: Introductionmentioning

confidence: 99%

“…Considering the current processing methods for Ox‐CMCs, it is clear that joining techniques are required to reliably produce components with higher complexity such as the ones present in turbine engines, for instance. Furthermore, joining can also decrease the production cost of such components as it is cheaper to produce simpler shapes that can be later joined together 6 …”

Section: Introductionmentioning

confidence: 99%

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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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