Temperature-induced fibre/matrix interactions in porous alumino silicate ceramic matrix composites

Schmücker, Martin; Kanka, B.; Schneider, Hartmut

doi:10.1016/s0955-2219(00)00150-3

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…It was ≈30 nm in thickness, and was in a polycrystalline structure. Similar interfacial reaction has been also observed in other AS fiber reinforced Al 2 O 3 matrix composite system, and is possibly dominated by the reaction between the SiO 2 phase at the AS fiber surface and the remaining γ‐Al 2 O 3 phase in the Al 2 O 3 matrix …”

Section: Resultssupporting

confidence: 80%

“…Similar interfacial reaction has been also observed in other AS fiber reinforced Al 2 O 3 matrix composite system, and is possibly dominated by the reaction between the SiO 2 phase at the AS fiber surface and the remaining c-Al 2 O 3 phase in the Al 2 O 3 matrix. 36 interface, as listed in Table 1. Figure 9 plots the predicted stress-strain curves of the RVE under transverse tensile loading as a function of sintering temperature.…”

Section: Micro-mechanical Properties Of Fiber Matrix and Interfacementioning

confidence: 99%

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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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A novel methodology combining multiscale mechanical testing and finite element modeling is proposed to quantify the sintering temperature‐dependent mechanical properties of oxide matrix composites, like aluminosilicate (AS) fiber reinforced Al2O3 matrix (ASf/Al2O3) composite in this work. The results showed a high‐temperature sensitivity in the modulus/strength of AS fiber and Al2O3 matrix due to their phase transitions at 1200°C, as revealed by instrumented nanoindentation technique. The interfacial strength, as measured by a novel fiber push‐in technique, was also temperature‐dependent. Specially at 1200°C, an interfacial phase reaction was observed, which bonded the interface tightly, as a result, the interfacial shear strength was up to ≈450 MPa. Employing the measured micro‐mechanical parameters of the composite constituents enabled the prediction of deformation mechanism of the composite in microscale, which suggested a dominant role of interface on the ductile/brittle behavior of the composite in tension and shear. Accordingly, the ASf/Al2O3 composite exhibited a ductile‐to‐brittle transition as the sintering temperature increased from 800 to 1200°C, due to the prohibition of interfacial debonding at higher temperatures, in good agreement with numerical predictions. The proposed multiscale methodology provides a powerful tool to study the mechanical properties of oxide matrix composites qualitatively and quantitatively.

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Section: Resultssupporting

confidence: 80%

Section: Micro-mechanical Properties Of Fiber Matrix and Interfacementioning

confidence: 99%

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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“…The influence of matrix composition on microstructural stability and fracture behavior after short-term firing (1 h) was investigated in detail for WHIPOX oxide/oxide CMCs, consisting of Nextel 720 fibers and an aluminosilicate matrix (68wt.% Al 2 O 3 , 32% SiO 2 ) corresponding to phase composition of mullite plus minor amounts of silica-rich glass, or, alternatively with an alumino-rich matrix with 95wt.% Al 2 O 3 , 5% SiO 2 (␣-alumina plus minor amounts of mullite). It turned out that the silica-rich matrix reacts with the (aluminarich) Nextel 720 fibers, thus leading to a new generation of mullite formed at the fibers' outer peripheries (Figure 9) [11]. The silica-rich matrices of these heat-treated materials show significant pore agglomeration and densification effects.…”

Section: Effects Of Thermal Agingmentioning

confidence: 99%

WHIPOX All Oxide Ceramic Matrix Composites

Schmücker

Schneider

Handbook of Ceramic Composites

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WHIPOX is a fiber-reinforced porous matrix CMC developed at the German Aerospace Center (DLR). The composite consists of commercial alumina or alumino silicate fibers and mullite, mullite/alumina, or alumina matrices. WHIPOX manufacturing is based on a continuous fiber bundle infiltration and winding process. After shaping in the moist stage, green bodies of WHIPOX are sintered pressureless in air. WHIPOX CMCs display quasi-ductile deformation and excellent thermal shock resistance. Depending on fiber and matrix compositions, interlaminate shear strength values of 10 MPa and Young's moduli of ≈150 GPa can be obtained. Thermal conductivity perpendicular to fiber orientation is about 1W/mK. The simple winding and sintering techniques and the fact that no fiber coating is required makes WHIPOX an inexpensive CMC material.

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“…When nanotechnology was introduced in the production of CMCs and analysis went from micro to nanoscale (composites to nanocomposites), some of the previously existing 2 Journal of Nanomaterials [9] Fibres Nonoxide Carbon [10] Silicon carbide [11][12][13] Alumina [8] Mullite [14] Zirconia [15] materials lost impact and others arose. For example, the introduction of CNTs [16,17] and graphene nanosheets [18,19] in CMCs led to great interest of the research community due to the outstanding inherent mechanical, thermal, and electrical properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites

Silvestre

Brito

2015

Journal of Nanomaterials

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Due to their prominent properties (mechanical, stiffness, strength, thermal stability), ceramic composite materials (CMC) have been widely applied in automotive, industrial and aerospace engineering, as well as in biomedical and electronic devices. Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity, CMCs have been greatly improved in the last decade. CMCs are produced from ceramic fibres embedded in a ceramic matrix, for which several ceramic materials (oxide or non-oxide) are used for the fibres and the matrix. Due to the large diversity of available fibres, the properties of CMCs can be adapted to achieve structural targets. They are especially valuable for structural components with demanding mechanical and thermal requirements. However, with the advent of nanoparticles in this century, the research interests in CMCs are now changing from classical reinforcement (e.g., microscale fibres) to new types of reinforcement at nanoscale. This review paper presents the current state of knowledge on processing and mechanical properties of a new generation of CMCs: Ceramics Nanocomposites (CNCs).

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Temperature-induced fibre/matrix interactions in porous alumino silicate ceramic matrix composites

Cited by 16 publications

References 13 publications

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

WHIPOX All Oxide Ceramic Matrix Composites

An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites

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