A new concept for thermal protection of all-mullite composites in combustion chambers

Steinhauser, U.; Braue, W.; Göring, J.; Kanka, B.; Schneider, Hartmut

doi:10.1016/s0955-2219(99)00265-4

Cited by 21 publications

(7 citation statements)

References 6 publications

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“…Ceramic Matrix Composites (CMC) are usually used as a porous material with controlled permeability 6,7,8,9 to sustain large heat load compared to metallic materials, while operating at much higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Najmi

El-Tabach

Chetehouna

et al. 2016

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Najmi

El-Tabach

Chetehouna

et al. 2016

International Journal of Hydrogen Energy

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“…It has several desirable qualities such as high-temperature stability and oxidation resistance that give it potential for use in many applications 1 such as gas turbine engines. 2 Because of the long-term use of mullite and its technological importance, 3 many measurements have been made of its mechanical properties, including its elastic properties at ambient and elevated temperatures. 4 -10 For the most part, these studies have focused on bulk polycrystalline materials, and have revealed significant discrepancies in the measured elastic properties.…”

Section: Introductionmentioning

confidence: 99%

Complete Elastic Tensor for Mullite (∼2.5Al₂O₃·SiO₂) to High Temperatures Measured from Textured Fibers

Palko¹,

Sayir²,

Sinogeikin³

et al. 2002

Journal of the American Ceramic Society

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Directionally solidified mullite fibers have been grown by the laser‐heated, float‐zone method from starting materials with a nominal composition of 3Al2O3·2SiO2. The fibers used in this study have large single‐crystal regions with composition 2.5Al2O3·SiO2 and (001) fiber axis orientation. The complete elastic tensor of these samples has been determined by Brillouin spectroscopy at room temperature and elevated temperatures up to 1200°C. Isotropic moduli (bulk, shear, and Young's) have been calculated using the Voigt–Reuss–Hill averaging scheme. The room‐temperature values obtained are KVRH= 173.5 ± 6.9 GPa, GVRH= 88.0 ± 3.5 GPa, EVRH= 225.9 ± 9.0 GPa. All moduli show gradual, linear decreases with temperature. The temperature derivatives obtained for the equivalent, isotropic moduli are dKVRH/dT=−17.5 ± 2.5 MPa/°C, dGVRH/dT=−8.8 ± 1.4 MPa/°C, dEVRH/dT=−22.6 ± 2.8 MPa/°C. Substantial differences between bulk properties calculated from the single–crystal measurements in this study and the properties reported in the literature for polycrystalline sintered mullite are identified, indicating the importance of factors such as microstructure, intergranular phases, and composition to the elasticity of mullite ceramics.

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“…A similar manufacturing approach was previously introduced in the authors' laboratory, where stacked woven mullite-based, Nextel ® 720 type fiber fabrics were employed to fabricate "matrix-free" composites by uniaxial hot-pressing [18]. In the present work we explore a processing window by taking advantage of the semi-crystalline, diphasic fiber microstructure of MAFTEC MLS-2…”

Section: Introductionmentioning

confidence: 98%

Manufacturing of porous mullite fiber compacts by uniaxial hot pressing of semicrystalline MAFTEC® MLS-2 organic bound mats

2017

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Highly porous and fully crystalline mullite fiber compacts were fabricated by uniaxial hot-pressing of stacked short-fiber mats without binders or sintering aids. The special feature of this new fabrication method is the use of MAFTEC ® OBM type fiber mats consisting of semi-crystalline "MLS-2" short fibers. In contrast to conventional, polycrystalline mullite fibers semi-crystalline MLS-2 fibers are consisting of amorphous silica and nanoscale transitional alumina. Due to this special microstructure MLS-2 fibers are less prone to fiber breakage upon shear load, therefore are well withstanding pressure-assisted consolidation. Hot-pressing of stacked OBM to highly porous fiber compacts is facilitated by the thermally driven softening of amorphous silica above 900°C, favorable deformation and consolidation rates are achieved above 1050°C. Above 1250°C mullite is crystallizing at the expense of amorphous silica, simultaneously deformation and consolidation comes to an end. Obtained MAFTEC OBM-derived fiber compacts only consist of crystalline mullite, therefore mechanical properties are favorably retained at high temperatures.

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A new concept for thermal protection of all-mullite composites in combustion chambers

Cited by 21 publications

References 6 publications

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Complete Elastic Tensor for Mullite (∼2.5Al₂O₃·SiO₂) to High Temperatures Measured from Textured Fibers

Manufacturing of porous mullite fiber compacts by uniaxial hot pressing of semicrystalline MAFTEC® MLS-2 organic bound mats

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A new concept for thermal protection of all-mullite composites in combustion chambers

Cited by 21 publications

References 6 publications

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Effect of flow configuration on Darcian and Forchheimer permeabilities determination in a porous composite tube

Complete Elastic Tensor for Mullite (∼2.5Al2O3·SiO2) to High Temperatures Measured from Textured Fibers

Manufacturing of porous mullite fiber compacts by uniaxial hot pressing of semicrystalline MAFTEC® MLS-2 organic bound mats

Contact Info

Product

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About

Complete Elastic Tensor for Mullite (∼2.5Al₂O₃·SiO₂) to High Temperatures Measured from Textured Fibers