Environmental effects on the strength and impact damage resistance of alumina based oxide/oxide ceramic matrix composites

Singh, Abhendra K.; Kahle, Kaitlyn; James, Hannah; Horner, Allison; Villaflor, Daniel; Benedict, Zach

doi:10.1016/j.ceramint.2021.03.038

Cited by 12 publications

(4 citation statements)

References 9 publications

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“…give continuous alumina ceramic fibers many competitive advantages in high-temperature applications [10][11][12][13][14] , such as aerospace applications 15,16 , although they exhibit slightly lower mechanical properties compared to the popular SiC fibers 17,18 . However, current commercial continuous alumina fibers with fine-grained microstructures cannot meet the growing demand in markets and aerospace, such as long-term use in higher temperatures, steam, and other environments 19,20 . In fact, one commonly retorts to adding the second phase to improve the high-temperature stability of alumina fibers 8,[20][21][22][23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

Liu

et al. 2023

Preprint

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High-strength materials often rely on their fine crystal structure, but the tendency of these crystals to coarsen at high temperatures poses a significant challenge in cutting-edge fields. Enhancing thermal stability while maintaining mechanical properties has become a complex issue in material development. In alumina ceramic fibers, we had observed that the ordered superstructures induced by segregation at the grain boundary networks of α-Al2O3 significantly enhanced the thermal stability of alumina grains without compromising their tensile strength. This led to a remarkable increase in heat-resistant temperature for fine alumina grains, which could exceed 1250 °C and thus greatly expanded the upper limit of alumina materials in high-temperature fields. Simultaneously, the phase-field simulation revealed that ordered superstructures likely reduced alumina's grain boundary diffusion coefficient to nearly match its volume diffusion coefficient. It was foreseeable that these structures would become a promising strategy for enhancing the high-temperature stability of alumina ceramic materials in the future.

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Section: Introductionmentioning

confidence: 99%

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

Liu

et al. 2023

Preprint

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“…As a family of architectural ceramic products, traditional large-sized ceramic plates with dimensions of more than 800 × 800 mm are attractive and convenient for decoration and they have attracted research interest recently. However, the raw materials for traditional ceramic plates are mineral resources, which are limited and overexploited [1,2]. Thus, there is a significant tendency for ceramic plates to decrease the thickness to reduce energy consumption and improve the utilization rate of mineral raw materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of large-sized thin architectural ceramic plate enhanced by alumina fibres and in situ mullite whiskers

Zhong

Cao

Huang

et al. 2022

PAC

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The fibres reinforced thin architectural ceramic plates of 900?1800?2.5mm with excellent mechanical properties were prepared by fast-sintering method using a controllable fibre dispersion process. The effects of ball-milling time on dispersity, average length-to-diameter ratio and microstructure of alumina fibres were investigated. Meanwhile, the effects of alumina fibre contents on the bulk density, water absorption, phase transformation and microstructure of the thin ceramic plate were researched. It was found that the two-step ball-milling process can effectively control the average length-to-diameter ratio of alumina fibres, achieving a good dispersion mixture of fibres and ceramic powders. Ceramics bulk density and bending strength increase with fibre contents rise from 0 to 5 wt.% and then decrease with further fibre content addition from 5 to 15wt.%. The in situ formed mullite whiskers via fast-sintering method are beneficial for protecting fibres and fibre/matrix interfaces. The maximum value of bending strength and fracture toughness reach 147MPa for 5 wt.% fibre contents and 2.6MPa?m1/2 for 9 wt.%fibre contents, corresponding to the strengthening of alumina fibres and the formation of mullite whiskers in fibre/matrix interfaces and matrix via fast-sintering process.

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“…Ceramic matrix composites due to their quasi-ductile behavior provide greater resilience to impact damage in comparison to brittle monolithic ceramics. While a number of studies have previously focused on impact damage in CMCs under different environments, [17][18][19][20][21][22][23][24][25] only a single study looked at the effect of moisture ingression on the impact damage resistance of CMC. 17 The study focused on alumina based CMC with [0°/90°] 3s layup and did not extend to the post-impact compressive strength (damage tolerance) of the laminates.…”

Section: Introductionmentioning

confidence: 99%

“…While a number of studies have previously focused on impact damage in CMCs under different environments, [17][18][19][20][21][22][23][24][25] only a single study looked at the effect of moisture ingression on the impact damage resistance of CMC. 17 The study focused on alumina based CMC with [0°/90°] 3s layup and did not extend to the post-impact compressive strength (damage tolerance) of the laminates. Because of the possibility of foreign object damage due to low velocity impact events such as flying debris and tool drops, it is imperative that the structural implications of these unwanted events be fully evaluated and understood.…”

Section: Introductionmentioning

confidence: 99%

Effects of moisture ingression on the impact damage resistance and damage tolerance of alumina based oxide/oxide ceramic matrix composites

Ortega

Kitt

et al. 2022

Journal of Composite Materials

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In this study the effects of moisture ingression on the impact damage resistance and damage tolerance of NextelTM610/alumina-silicate ceramic matrix composites were experimentally evaluated. Thin and thick composite laminates with balanced and symmetric layups were placed inside an environmental chamber at 80°C and 85% relative humidity till moisture saturation was reached. The laminates were then subjected to low velocity impacts using a hemispherical steel impactor at energy levels of 2.5 J and 10 J for the thin and thick laminates, respectively. This resulted in similar damage depths on the impactor side between the two sets of laminates. The resultant damage was characterized non-destructively with the damage metrics of external dent area, dent depth and planar internal damage area quantitatively determined. Impacted laminates were subject to in-plane compression loading and the residual strengths were evaluated. Planar internal damage area was larger for the moisture exposed laminates in comparison to their pristine counterparts for both the thin and thick laminates. Also, larger internal damage area resulted in lower compression-after-impact strength and thus, less damage tolerant laminates. This was true for the pristine and moisture exposed cases for both the laminate thicknesses.

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Environmental effects on the strength and impact damage resistance of alumina based oxide/oxide ceramic matrix composites

Cited by 12 publications

References 9 publications

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

Mechanical properties of large-sized thin architectural ceramic plate enhanced by alumina fibres and in situ mullite whiskers

Effects of moisture ingression on the impact damage resistance and damage tolerance of alumina based oxide/oxide ceramic matrix composites

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