High‐Temperature Mechanical Properties of Ceramic Materials: IV, Sintered Mullite Bodies

Fenstermacher, J. E.; Hummel, F. A.

doi:10.1111/j.1151-2916.1961.tb15379.x

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…5 The data of Wachtman and Lam show a distinct nonlinear softening above 600°C. Fenstermacher and Hummel report data which agree in general form with that of Wachtman and Lam although with much more scatter and lower absolute magnitude of E. 6 Our data support a linear fit within their accuracy, with no significant change in the rate of softening. The value of dG/dT based on the present study falls between that reported by Ledbetter et al (Ϫ3.3 MPa/°C) 10 and that suggested by a linear fit to Wygant's data (ϳϪ30 MPa/°C).…”

Section: (2) High-temperature Elasticitysupporting

confidence: 79%

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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Section: (2) High-temperature Elasticitysupporting

confidence: 79%

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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“…There are reported experimental data (see Table ) on the elastic stiffness constants of single crystal 2/1 mullite and 2.5/1 mullite . In the 2/1 mullite, the reported values for C 11 , C 33 , C 12 , and C 23 from the two sets of measurements are somewhat different.…”

Section: Mechanical Properties Of the Mullite Phasesmentioning

confidence: 99%

“…Because of its wide range of applications, mullites have received considerable attention over the years . A large number of works have covered processing, structure determination, characterization, thermodynamics, thermal, mechanical, and optical properties . Besides the popular monolithic use of mullites, mullite coatings, fibers, and matrix composites are also becoming increasingly popular in modern technology .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Electronic Structure of Mullite Phases Using First‐Principles Modeling

2012

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The alumino-silicate series (Al 4+2x Si 2À2x O 10-x , x = 0-1), is an important class of structural ceramics with many applications. Except for the end member (x = 0), which is the crystalline phase sillimanite, the reported crystal structures of the other phases, called mullites, all have partially occupied sites which makes any theoretical calculation a formidable task. In this article, we describe a systematic and detailed theoretical investigation of the structures and properties of the phases in this series. We constructed stoichiometric supercell models for the four well-known mullite phases 3Al 2 O 3 ·2SiO 2 , 2Al 2 O 3 ·SiO 2 , 4Al 2 O 3 ·SiO 2 , 9Al 2 O 3 ·SiO 2 , corresponding to x = 0.25, 0.40, 0.67, and 0.842. The construction of the models began with experimentally reported crystal structures followed by systematic removal of selected atoms at the partially occupied sites to maintain charge neutrality. A large number of models were built for each phase and fully relaxed to high accuracy using the Vienna ab initio simulation package program. The model with the lowest total energy for a given x was chosen as the representative structure for that phase. Together with sillimanite (x = 0) and the silica free ι-Al 2 O 3 (x = 1), this series' electronic structure and mechanical properties were studied via first-principles calculations. Their elastic coefficients and mechanical properties (bulk modulus, shear modulus, Young's modulus, and Poisson's ratio) were evaluated. The electronic structure, effective charges, bonding, and optical properties of these mullite phases were calculated using the orthogonalized linear combination of atomic orbitals method. These first-principles results provide the basis for an explanation of the experimentally observed structure and properties of mullite phases and their trends with x at the fundamental level.

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“…Close to the orthorhombic system, it has high melting point (1870°C), good high-temperature mechanical and thermal performances. 1–5 The mullite product with mullite as the main crystalline phase has high structural strength of high temperature, low creep rate of high temperature, and good chemical erosion resistance. Compared with aluminum silicate with corundum as the main crystalline phase, it has small coefficient of thermal expansion and better stability of thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Mechanical properties analysis and microstructure of ceramic materials of mullite ceramic material

2018

International Journal of Electrical Engineering & Education

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Two unique multiphase volume elements were developed in this paper against the mechanical performance analysis problem of mullite ceramic material. They realized consideration of multiple materials in an element domain using the local strain correction of material property on each integral point and used tensile modulus for evaluating the three-dimensional domain component of stiffness tensor alternatively on the basis of adjusting interpolation function on the Gaussian point using one-dimensional spring analog method. Finally, the valid analysis was made on mechanical property and microstructure of mullite ceramic material through analysis of phase and microstructure.

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High‐Temperature Mechanical Properties of Ceramic Materials: IV, Sintered Mullite Bodies

Cited by 15 publications

References 10 publications

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

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

Mechanical Properties and Electronic Structure of Mullite Phases Using First‐Principles Modeling

RETRACTED: Mechanical properties analysis and microstructure of ceramic materials of mullite ceramic material

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High‐Temperature Mechanical Properties of Ceramic Materials: IV, Sintered Mullite Bodies

Cited by 15 publications

References 10 publications

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

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

Mechanical Properties and Electronic Structure of Mullite Phases Using First‐Principles Modeling

RETRACTED: Mechanical properties analysis and microstructure of ceramic materials of mullite ceramic material

Contact Info

Product

Resources

About

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

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