Journal ArticleDOI
Relationship between the microstructure of boehmite gels and their transformation to alpha-alumina
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In this paper, the gelation of aluminium hydroxide sols from aluminium propoxide and aluminium sec-butoxide has been studied at high temperature and high molar ratio of water under acidic conditions, up to 1.1 molar ratios of nitric acid per aluminium alkoxide.About:
This article is published in Materials Chemistry and Physics.The article was published on 1993-03-01. It has received 11 citations till now. The article focuses on the topics: Boehmite & Aluminium hydroxide.read more
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Effects of PVA content and calcination temperature on the properties of PVA/boehmite composite film
TL;DR: In this paper, composite films of polyvinyl alcohol (PVA) /boehmite with thicknesses of about 180 μm were studied for samples with different PVA contents at different calcination temperatures.
Journal ArticleDOI
Improving the surface hardness of zirconia toughened alumina (ZTA) composites by surface treatment with a boehmite sol
TL;DR: In this article, the hardness of a zirconia-toughened alumina (ZTA) composite was improved by surface treatments with a boehmite sol, which led to a significant increase in the surface hardness of the ZTA composite.
Journal ArticleDOI
Preparation and characterization of multilayer mesoporous alumina nano membrane via sol–gel method using new precursors
TL;DR: In this paper, a mesoporous γ-alumina layer was coated on a macroporous α alumina support via sol-gel method to produce a multilayer mesophorous alumina membrane with high performance Different parameters like homogeneity of colloidal solution, additive, working temperature, roughness of the membrane surface, membrane thickness and porosity were analyzed.
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Reuse of UK alum water treatment sludge in cement-based materials
TL;DR: In this article, heat-treated alum sludge was used as an additive in cement and was calcined at 475-1100°C and then characterized to correlate physical and mineralogical changes with cementitious activity and engineering performance.
Journal ArticleDOI
Interactions in the sol-gel processing of aluminazirconia composites
V. Srdić,L. Radonjić +1 more
TL;DR: In this article, the combined effect of alumina and zirconia on the phase transformation and microstructure development of heat-treated alumina composites has been studied.
References
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Journal ArticleDOI
Ultrastructure processing of ceramics, glasses, and composites
D.R. Uhlmann,Donald R. Ulrich +1 more
TL;DR: In this paper, the state of the science of producing ceramic, glass, and composite materials using the new methods of chemical micromorphology, and transformation based processing, along with practical applications is examined.
Journal ArticleDOI
Alumina gels that form porous transparent Al2O3
TL;DR: In this paper, the authors discuss the requirements for a porous transparent Al2O3 from aluminium alkoxides to retain its integrity during drying and pyrolysis, and show that there is a critical electrolyte concentration at which the gelling volume goes through a pronounced minimum.
Book
Science of ceramic chemical processing
Larry L. Hench,Donald R. Ulrich +1 more
TL;DR: In this article, the relationship between Sol to Gel to Glass Conversions: Structure of Gels During Densification (C. R. Uhlmann, et al., 2013) is discussed.
Journal ArticleDOI
Controlled Transformation and Sintering of a Boehmite Sol-Gel by α-Alumina Seeding
Masato Kumagai,Gary L. Messing +1 more
TL;DR: In this article, the transformation, microstructural development, and densification of an α-alumina-seeded boehmite sol-gel was studied, and α-Alumina particles are shown to act as nuclei for the trans-formation of θ- to α- alumina and to result in an increase in the transformation kinetics and lowering of the transformation temperature by as much as 170°C.
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Alpha Alumina Formation in Alum‐Derived Gamma Alumina
F. W. Dynys,John W. Halloran +1 more
TL;DR: In this paper, the formation of alpha alumina in gamma alumina obtained from ammonium alum was studied at 1150°C, where the transformation occurs by a nucleation and growth process, preceded by an incubation time.