Alumina region of ternary aluminosilicate systems Communication 4. The system Li2O-Al2O3-SiO2

Galakhov, F. Ya.

doi:10.1007/bf00915844

Cited by 3 publications

(6 citation statements)

References 3 publications

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“…5, it can be observed that no reaction occurred between the LAS phase and alumina, avoiding the formation of third phases such as mullite or lithium aluminate, as could be expected from the Li 2 O-Al 2 O 3 -SiO 2 equilibrium phase diagrams. [18][19][20] This was confirmed for all the composites tested, either with different LAS-alumina contents or for different LAS compositions synthesized ad hoc (Table 2). Moreover, an additional LAS-alumina composite was tested using a different alumina powder and once more no reaction between alumina and the LAS phase was observed, at least for the for- …”

Section: Pressureless Conventional Sinteringsupporting

confidence: 61%

Alumina reinforced eucryptite ceramics: Very low thermal expansion material with improved mechanical properties

Moreno

Borrell

Bittmann

et al. 2011

Journal of the European Ceramic Society

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Composite materials formed by a LAS matrix reinforced with second phases are promising materials in many applications where better mechanical properties than those corresponding to conventional low thermal expansion coefficient materials are required. In this study we will show the capability of the design of a LAS-alumina submicron composite. The main scope of this work is to test the sinterability of the composites and to design a composition for a very low thermal expansion submicron composite. For this purpose, Taimei alumina (TM-DAR) powders and an ad hoc synthesized ␤-eucryptite phase were used to fabricate the composite. XRD phase compositions and microstructures are discussed together with data from dilatometries in a wide temperature range. The results obtained show the possibility of designing a submicron composite with a very low thermal expansion coefficient and improved mechanical properties that can be used in oxidizing conditions.

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Section: Pressureless Conventional Sinteringsupporting

confidence: 61%

Alumina reinforced eucryptite ceramics: Very low thermal expansion material with improved mechanical properties

Moreno

Borrell

Bittmann

et al. 2011

Journal of the European Ceramic Society

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“…A different tactic could be adopted with metastable phase relations using nonconventional sintering methods . On the basis of the phase diagrams of Hatcht, Roy, and mainly Galakhov, and far from the scope of drawing a complete phase diagram, we have performed a series of experiments trying to constrain the solid‐state phase relations of the alumina‐rich phases in the diagram.…”

Section: Introductionsupporting

confidence: 90%

“…(a) Galakhov's lithium aluminosilicate phase diagram; (b) Alkemade's lines drawn from Galakhov phase relations; (c) new alternative Alkemade lines which explain the experimental results of this study at 1400°C. Eu = β‐eucryptite; LA = Li 2 O·Al 2 O 3 ; LA 5 = Li 2 O·5Al 2 O 3 ; Co = Alumina; Mu = Mullite.…”

Section: Resultssupporting

confidence: 70%

“…This result was not expected if we consider the published equilibrium phase diagram by Galakhov . Neither was it predicted by the MTDATA calculations, which are again based on a database built from the published phase diagram in the LAS system.…”

Section: Resultsmentioning

confidence: 69%

“…These works were focused on the silica‐rich region of the phase diagram where all of the thermally interesting phases are located. The work of Galakhov is, as far as we know, the only deep approach to the alumina corner of the diagram, and although thoroughly studied there are some uncertainties in the phase relations as some parts of the diagram are drawn as tentative lines and have to be interpreted.…”

Section: Introductionmentioning

confidence: 99%

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Alumina Region of the Lithium Aluminosilicate System: A New Window for Temperature Ultrastable Materials Design

et al. 2013

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Revisiting classic phase diagrams and chemical phase relations in the solid state of a very well‐studied oxide system, such as the lithium aluminosilicate (LAS) system, can open a new window for the design of new advanced materials with improved properties. Crystal chemistry and phase equilibria are used to demonstrate the ability to design materials with particular desired properties in the alumina‐rich corner of the LAS phase diagram. The experimental results demonstrate the alumina and β‐eucryptite solid‐state compatibility.

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Design of alumina/β-eucryptite composite from alum sludge waste: physical properties, phase composition and coefficient of thermal expansion

Hegazy

Khattab

almaged

et al. 2023

Frontiers in Scientific Research and Technology

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The main objective of this research is to design alumina/β-eucryptite composite with a low coefficient of thermal expansion (CTE) and then test its sinterability using alum sludge from water treatment plants as an alumina source. A suitable chemical method is used to extract alumina from alum sludge waste. In addition to extracted alumina, silica fume waste and lithium carbonate were used to prepare β-eucryptite. In order to prepare β-eucryptite, the phase formation is first to be adjusted. The prepared samples were fired at 800, 1000, and 1200 ºC, respectively.XRD, SEM, physical properties, and thermal expansion are used to characterize these samples. The results indicate that 1000ºC is the optimum temperature for eucryptite formation. The samples of alumina/βeucryptite containing 10, 20, 30, and 40% eucryptite are then prepared, and the influence of the heat treatment on the prepared composites is studied at temperature ranges of 1300, 1400, and 1500ºC. XRD analysis, microstructure, physical, and mechanical properties of alumina/β-eucryptite composites are investigated. The coefficient of thermal expansion (CTE) for various alumina/β-eucryptite samples at 1500ºC reduces with increasing β-eucryptite content, reaching 0.8098 x 10 -6 o C -1 . The results demonstrate that a composite with good mechanical properties and a low thermal expansion coefficient can be formed and utilized in a variety of different applications.

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Alumina region of ternary aluminosilicate systems Communication 4. The system Li2O-Al2O3-SiO2

Cited by 3 publications

References 3 publications

Alumina reinforced eucryptite ceramics: Very low thermal expansion material with improved mechanical properties

Alumina reinforced eucryptite ceramics: Very low thermal expansion material with improved mechanical properties

Alumina Region of the Lithium Aluminosilicate System: A New Window for Temperature Ultrastable Materials Design

Design of alumina/β-eucryptite composite from alum sludge waste: physical properties, phase composition and coefficient of thermal expansion

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