(PDF) Enhancing the mechanical properties of porcelain
This paper focuses on the complexities of the microstructure and phase development in porcelain stoneware tiles produced following industrial fast single firing cycles. A microstructural investigation was conducted to determine if the addition of
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Preparation and Performance Study of Mullite/Al2O3
· For lowering sintering temperature of mullite/Al2O3 composite ceramics for solar thermal transmission pipeline kaolin potassium feldspar quartz and γ‐Al2O3 were used as raw materials to in situ synthesize the composite ceramics with pressureless sintering method. Densification mechanical properties thermal expansion coefficient thermal shock resistance phase composition and
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Topotactic growth of α-alumina platelets on 2/1 mullite
· Annealing experiments of Czochralski-grown 2/1 mullite single crystal coupons oriented parallel to (1 0 0) (0 1 0) and (0 0 1) were performed in the temperature range 1200–1650 °C for 4–16 h in different atmospheres (dry versus wet air) at normal pressure.Upon thermal decomposition of the Al 2 O 3-supersaturated 2/1 mullite metastable in the two-phase region "mullite plus Al 2 O 3
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(IUCr) Characterizing modulated structures with first
Quantitative parameters of modulated crystal structures are determined from density functional theory calculations applied to superstructures obtained using the superspace formalism. The example of mullite is used to demonstrate that with this approach versatile aspects ranging from ordering phenomena to phase diagrams can be understood on a new level.
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Toughening Mechanism of Mullite Matrix Composites A Review
Mullite and mullite matrix ceramics exhibit a variety of appearance such as Czochralski-grown single crystals polycrystalline and multiphase ceramics. As Shown in Figure 3 a this is a large uniform non-inclusion and optically transparent mullite single crystal grown by Czochralski method by Berlin Crystal Growth Research Institute 13 .
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Cold isostatic pressing as a method for fabricating
The experimental results published by the author and his co-workers in 24 earlier works and novel original data are analyzed. It is shown that the process of cold isostatic pressing (CIP) occurs with mechanical activation of the powder particles due to their self-deformation with a simultaneous self-compaction of the semiproduct. The CIP process of powders or traditionally shaped preforms is
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Topotactic growth of α-alumina platelets on 2/1 mullite
· Single crystal 2/1 mullite starting material2/1-mullite single crystals employed in this study comprise a chemical composition of 76.7 wt Al 2 O 3 and 23.3 wt SiO 2 corresponding to x = 0.385 in the general structural formula Al 2 Al 2 2x ·Si 2−2x O 10−x.
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Mullite-corundum-spinel-cordierite-plagioclase xenoliths
· Some corundum crystals are in contact with mullite and/or spinel whereas some corundum and some spinel crystals are surrounded by an about 0.5-mm-wide rim of clear plagioclase with only very few or even no mullite needles at all (Fig. 3A). In summary the cores of the xenoliths contain the early assemblage corundum plagioclase rutile
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Effect of Alumina Substitution on Porosity and Thermal
December 2014 Effect of Alumina Substitution on Triaxial Porcelain-Like Bodies 289 Fig.4 The state of samples at 1400°C on mineralogical basis. P D and G denote like Fig.2. Fig.5 Linear shrinkage ( ) of samples at 1230°C on mineralogical basis. This observation can be observed at samples fired at 1400°C (Fig.6). Samples with low clay and moderate flux
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(PDF) Experimental deformation of muscovite shear zones at
Also no microstructural evidence was observed that could be attributed to deformation by diffusive mass transfer.HarpereDorn creep has been reported in the low stress (s < 10 À6 G in polycrystalline materials and flow stress <10 À4 G in single crystals where G is the shear modulus) high temperature (T 0.9 T m ) deformation of aluminium
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Toughening Mechanism of Mullite Matrix Composites A Review
Mullite and mullite matrix ceramics exhibit a variety of appearance such as Czochralski-grown single crystals polycrystalline and multiphase ceramics. As Shown in Figure 3 a this is a large uniform non-inclusion and optically transparent mullite single crystal grown by Czochralski method by Berlin Crystal Growth Research Institute 13 .
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Heat-Resistant Corundum Concrete Reinforced with Aluminum
· Work is well known for reinforcing high-temperature materials with metal fibers 1 2 and other materials mullite whisker single crystals 3–5 silicon carbide mullite acicular single crystals chromium oxide lamellar crystals and also fibers whiskers or wire of iron steel tungsten nickel molybdenum titanium and other metals
Get PricePreparation and Performance Study of Mullite/Al2O3
· For lowering sintering temperature of mullite/Al2O3 composite ceramics for solar thermal transmission pipeline kaolin potassium feldspar quartz and γ‐Al2O3 were used as raw materials to in situ synthesize the composite ceramics with pressureless sintering method. Densification mechanical properties thermal expansion coefficient thermal shock resistance phase composition and
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Kinetics of the thermal decomposition of kyanite
· The decomposition of sillimanite to corundum and glass observed by Gyepesova and Durovic was possibly influenced by traces of alcali single crystal diffraction studies on the high-temperature transformation of the AIzSiO silicates to 3 2-mullite and silica were published by Sadanaga et al. (andalusite and sillimanite) Saalfeld (kyanite
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Preparation Microstructure and Mechanical Properties of
The solid wastes fly ash and aluminum dross were used to prepare the low cost high added-value product spinel-corundum-Sialon with an in situ aluminothermic reduction-nitridation reaction. The effects of varying raw material components and heating temperatures on the phase compositions microstructure bulk density apparent porosity and bending strength of products were investigated.
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Heat-Resistant Corundum Concrete Reinforced with Aluminum
· Work is well known for reinforcing high-temperature materials with metal fibers 1 2 and other materials mullite whisker single crystals 3–5 silicon carbide mullite acicular single crystals chromium oxide lamellar crystals and also fibers whiskers or wire of iron steel tungsten nickel molybdenum titanium and other metals
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Mullite-corundum-spinel-cordierite-plagioclase xenoliths
· Some corundum crystals are in contact with mullite and/or spinel whereas some corundum and some spinel crystals are surrounded by an about 0.5-mm-wide rim of clear plagioclase with only very few or even no mullite needles at all (Fig. 3A). In summary the cores of the xenoliths contain the early assemblage corundum plagioclase rutile mullite sillimanite ± spinel.
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A Review on Synthesis of Mullite Ceramics from Industrial
Some industrial wastes are shown to be useful in the production of mullite ceramics. These industrial wastes are rich in certain metal oxides such as silica (SiO2) and alumina (Al2O3). This gives wastes the potential to be used as a starting material source for mullite ceramics preparation. The purpose of this review paper is to compile and review various mullite ceramics preparation methods
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Preparation and Performance Study of Mullite/Al2O3
· For lowering sintering temperature of mullite/Al2O3 composite ceramics for solar thermal transmission pipeline kaolin potassium feldspar quartz and γ‐Al2O3 were used as raw materials to in situ synthesize the composite ceramics with pressureless sintering method. Densification mechanical properties thermal expansion coefficient thermal shock resistance phase composition and
Get Price(IUCr) Characterizing modulated structures with first
Quantitative parameters of modulated crystal structures are determined from density functional theory calculations applied to superstructures obtained using the superspace formalism. The example of mullite is used to demonstrate that with this approach versatile aspects ranging from ordering phenomena to phase diagrams can be understood on a new level.
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Shock deformation of sillimanite from the Ries crater
· EARTH AND PLANETARY SCIENCE LETTERS 10 (1970) NORTH-HOLLAND PUBLISHING COMPANY SHOCK DEFORMATION OF SILLIMANITE FROM THE RIES CRATER GERMANY D. STFLER Mtneralogisch-petrographesches Institut der Universitat Tubingen Received 29 September 1970 Shocked sillimanite was found as a man constituent of fragmental garnet-sillnnamte
Get PricePetrologic evolution of gneissic xenoliths in the Voisey s
Hercynite and plagioclase are ubiquitous in all xenoliths. Corundum is typically acicular or skeletal and is commonly replaced by acicular hercynite (Figures 7a–7c). Needles of corundum on the surfaces of plagioclase are found in the cores of some xenoliths . Three
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Topotactic growth of α-alumina platelets on 2/1 mullite
· The corrosive effects of high water vapor pressures were studied for a variety of polycrystalline mullite20 21 22 23 and single-crystal mullite materials.18 24 25 The corrosion mechanism of polycrystalline 3/2 mullite in a wet atmosphere is attributed to the formation of Si- and Al-hydroxides with Si(OH) 4 as the dominant volatile species following the simplified net reaction (2) 3Al
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The crystalline-to-amorphous transition in shock-loaded
· The 2/1 mullite crystals of the fused mullite brick some 10 μm in grain size were located between large porous corundum laths and a continuous siliceous glassy phase holding numerous zirconia particles. The non-crystalline phase acted as a sink
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SiO2NIST Ceramics Data Portal
· The present compilation of elastic moduli data for polycrystalline oxide ceramics includes Young s modulus shear modulus bulk modulus and Poisson s ratio. The data have been collected from the technical literature either as reported in textual or tabular formats or
Get PriceHeat-Resistant Corundum Concrete Reinforced with Aluminum
· Work is well known for reinforcing high-temperature materials with metal fibers 1 2 and other materials mullite whisker single crystals 3–5 silicon carbide mullite acicular single crystals chromium oxide lamellar crystals and also fibers whiskers or wire of iron steel tungsten nickel molybdenum titanium and other metals
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Mullite in Libyan Desert Glass Evidence for high
· Infrared and Raman spectroscopy investigations of dickite heated to 1000–1300 °C identify first mullite crystals along with Al-spinel corundum and cristobalite at 1100 °C (Shoval et al. 2002). The slightly higher formation temperature is likely due to different dehydroxylation processes of dickite (and halloysite) compared to kaolinite
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Issue No. 3 December
Depending on the concentration of the caustic soda used (in the range g/l) the proportion of mullite silica and hematite range between 49-53 42-44 and 5-7 respectively. The mullite agglomerated crystals are of mixed acicular and equiaxed morphology.
Get PriceEffect of Alumina Substitution on Porosity and Thermal
December 2014 Effect of Alumina Substitution on Triaxial Porcelain-Like Bodies 289 Fig.4 The state of samples at 1400°C on mineralogical basis. P D and G denote like Fig.2. Fig.5 Linear shrinkage ( ) of samples at 1230°C on mineralogical basis. This observation can be observed at samples fired at 1400°C (Fig.6). Samples with low clay and moderate flux
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