Journal ArticleDOI
High temperature thermal expansion of mullite: an in situ neutron diffraction study up to 1600°C
TLDR
In this article, the authors measured the thermal expansion of undoped and Cr-doped 3/2 mullites (10.8 wt.% Cr2O3) with in situ neutron and X-ray synchrotron (25-1000°C) diffraction techniques.Abstract:
Structural thermal expansions of undoped and Cr-doped 3/2 mullites (10.8 wt.% Cr2O3) were measured with in situ neutron (25–1600°C) and X-ray synchrotron (25–1000°C) diffraction techniques. Heat treatments between 25 and 300°C cause little and non-linear structural expansions. Above 300°C and up to 1000°C the mullites display linear and low increase of the lattice constants. The mean values of undoped mullite are slightly higher ( α av ≈ 5.45×10−6) than those of Cr-doped mullite ( α av ≈ 4.95×10−6), thus confirming earlier in situ high-temperature diffraction data. Above about 1000°C the expansion behaves discontinuously. Structural expansions of undoped and Cr-doped mullite strongly increase yielding similar mean expansion coefficients ( α av ≈ 7.50×10−6) for both materials. The highest increase of lattice constants has been determined in b axis direction throughout 1600°C in undoped and Cr-doped mullite. High temperature diffraction studies under heating-up and cooling-down conditions yielded reversible expansion effects, including the anomalous behaviour at about 1000°C.read more
Citations
More filters
Journal ArticleDOI
Cordierite synthesis. A time-resolved neutron diffraction study
TL;DR: In this paper, the authors present results obtained during the cordierite synthesis starting from talc, kaolin and hydromagnesite as reactants, and show that the presence of the μ-cordierite phase has been observed when the synthesis is carried out in solid state from non-submicronic natural raw materials.
Journal ArticleDOI
Refractories of Alumina-Silica System
TL;DR: In this article, a review covers different theoretical and practical aspects of refractories of aluminosilicate system spanning 30-100% alumina, highlighting the importance of microstructure in aluminosailicate refractory.
Journal ArticleDOI
Preparation of silver nanoparticle-containing ceramic filter by in-situ reduction and application for water disinfection
TL;DR: In this paper, the SNP-CF has been successfully prepared by an in-situ reduction method in which silver nitrate was first impregnated into activated carbon, which was then added into ceramic mixture for filter production.
Journal ArticleDOI
Evaluation of internal thermal barrier coatings for exhaust manifolds
TL;DR: In this paper, seven different thermal barrier coatings (TBC) intended for coating the inside of an exhaust manifold to reduce its material temperature were studied, which comprised five plasma-sprayed (mullite, f...
Journal ArticleDOI
Refinement of the real structures of 2:1 and 3:2 mullite
S. Freimann,S. Rahman +1 more
TL;DR: RahRahman et al. as discussed by the authors showed that the real structure of 2:1 mullite can be explained with intervacancy correlation vectors and a 3D ordering scheme for the oxygen vacancies was derived.
References
More filters
Journal ArticleDOI
Mullite for Structural, Electronic, and Optical Applications
TL;DR: Wiederhorn et al. as mentioned in this paper reviewed the current state of mullite-related research at a fundamental level, within the framework of phase equilibria, crystal structure, synthesis, processing, and properties.
Book
Mullite and mullite ceramics
TL;DR: Crystal Chemistry of Mullite Phase Equilibria of Mica and Mica-Ceramics Industrial Use of the Mullite as mentioned in this paper, and its Industrial Use in Mining and Mining.
Journal ArticleDOI
Thermal Expansion of Mullite
Hartmut Schneider,Emil Eberhard +1 more
TL;DR: The thermal expansion coefficients of transition-metal-free sinter mullite and fused mullite are measured between 25° and 900°C by high-temperature Guinier X-ray diffraction techniques as discussed by the authors.
Journal ArticleDOI
Development of Textured Mullite by Templated Grain Growth
Seong Hyeon Hong,Gary L. Messing +1 more
TL;DR: In this paper, high-textured mullite was obtained by enhancing anisotropic grain growth by TiO 2 doping and by templating grain growth on oriented acicular mullite seed particles in a mullite precursor.
Journal ArticleDOI
A mirror furnace for neutron diffraction up to 2300 K
TL;DR: In this paper, a mirror furnace was developed for neutron diffraction work at temperatures up to 2300 K. It is based on a reflecting rotational ellipsoid, in which the heating element, a halogen lamp, is placed at one focus and the sample at the other.