Assessment of three oxide/oxide ceramic matrix composites: Mechanical performance and effects of heat treatments

Volkmann, Eike; Tushtev, Kamen; Koch, Dietmar; Wilhelmi, Christian; Göring, J.; Rezwan, Kurosch

doi:10.1016/j.compositesa.2014.09.013

Cited by 87 publications

(51 citation statements)

References 59 publications

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“…They are prone to degradation of their strength and embrittlement when subjected to high-thermal loads, which is normally associated with the degradation of the fibers [10][11][12]. Early studies by Wilson [13] showed that the aforementioned fibers present strength loss when tested at temperatures above 1000°C.…”

Section: Introductionmentioning

confidence: 97%

Tensile and creep performance of a novel mullite fiber at high temperatures

Almeida

Tushtev

Clauß

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Section: Introductionmentioning

confidence: 97%

Tensile and creep performance of a novel mullite fiber at high temperatures

Almeida

Tushtev

Clauß

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…5) for each material. This trend between strength and toughness was found for several CMCs [11,35], but a general theory for ceramic matrix composites is still missing.…”

Section: Discussionmentioning

confidence: 93%

“…8 % after exposure to 1200°C for 50 h. In contrast, the N610 45 composites exhibited an increased stiffness, which was about 20 % higher compared to its as-received state. Previous studies [9,11] regarding the influence of heat treatments on the performance of SiOC containing composites, indicates that both, strength and fracture toughness are affected. The relation between fracture toughness and flexural strength is shown in Fig.…”

Section: Flexural Performancementioning

confidence: 97%

“…However, small residual amounts of carbon in the SiOC matrices make them susceptible to oxidation at high temperatures. As a consequence, unprotected composites suffer from a partial or complete closure of the often used fugitive interface between fiber and matrix due to the formation of silica bridges [9][10][11]. The increased interfacial adhesion decreases the fracture toughness and strength of the material [9,11].…”

Section: Introductionmentioning

confidence: 98%

“…As a consequence, unprotected composites suffer from a partial or complete closure of the often used fugitive interface between fiber and matrix due to the formation of silica bridges [9][10][11]. The increased interfacial adhesion decreases the fracture toughness and strength of the material [9,11]. It is important to improve the structural design, and calculation, of not only the toughness, strength and stiffness changes of these materials, but also the fracture behavior [12] which is likely to be affected by oxidation as well.…”

Section: Introductionmentioning

confidence: 99%

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Influence of heat treatment and fiber orientation on the damage threshold and the fracture behavior of Nextel fiber-reinforced Mullite-SiOC matrix composites analysed by acoustic emission monitoring

et al. 2014

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In the present study, we elucidate the influence of oxidative heat exposures at 1000 and 1200°C on an alumina fiber-reinforced polymer-derived ceramic matrix composite containing small residual amounts of carbon. Therefore, we investigated the flexural performance and fracture toughness of on-(0°/90°) and off-axis (45°) reinforced samples. Acoustic emission was used to monitor the internal damage and its progression during loading. At 1000°C, a moderate reduction of strength and fracture toughness is found while after exposure to 1200°C a dramatic decrease down to 50 % is observed. For all composites, a reduction of the damaged volume was found after heat treatments indicating a decrease of crack deflection. However, especially at 1000°C, composites reinforced in 0°/90°direction seemed to be more affected, as no detrimental effect on the mechanical performance was found for the 45°composites. Remarkably, the oxidation-induced silica formation increases the absolute and relative damage thresholds of all composites. A Griffithlike linear relationship between strength and toughness is found. These findings are pivotal for designing and engineering next generation CMCs toward long-term applications.

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