Results 191 to 200 of about 31,514 (255)

Formaldehyde Decomposition from -20 °C to Room Temperature on a Mn-Mullite YMn2O5 Catalyst.

Environmental Science and Technology, 2022
Large ambient temperature changes (-20->25 °C) bring great challenges to the purification of the indoor pollutant formaldehyde. Within such a large ambient temperature range, we herein report a manganese-based strategy, that is, a mullite catalyst ...
Fangxie Shen, Xiang Wan, Lijing Wang, Chunning Zhao, Shen Zhang, Anqi Dong, Kaiyu Shi, Haijun Zhang, Xiaomeng Zhou, Kunpeng He, Yinchang Feng, Weichao Wang   +11 more
semanticscholar   +1 more source

Mullite/molybdenum composites

Composite Interfaces, 1998
The possibility of fabricating continuous mullite/Mo FGMs with density closed to theoretical, by pressure slip casting of proof ethyl alcohol based slurries has been shown. Dense (> 98 th%) homogeneous mullite/Mo (32 vol%) composites with two Mo average grain sizes (1.5 and 3 μm) have been obtained at 1650°C in vacuum and under reducing conditions ...
J.S. Moya, J.F. Bartolomé, M. Díaz, J. Requena   +3 more
openaire   +1 more source

Mullite precursor phases

Journal of the European Ceramic Society, 1993
Abstract Admixtures of tetraethoxysilane (TEOS) and aluminium sec.-butylate (AlOBu) with stoichiometric 3Al2O3.2SiO2 mullite composition were used for the syntheses. Depending on the amount of H2O, the velocity of the hydrolysis process and the pH of the solvent, three different types of temperature-induced mullite formation processes are observed ...
Schneider, H., Saruhan, B., Voll, D., Merwin, L., Sebald, A.   +4 more
openaire   +2 more sources

Mullite and mullite-type crystal structures

International Journal of Materials Research, 2012
Abstract Synthetic mullites (Al4+2 x Si2 –2 x O10 – x ) belong to one of the most important groups of ceramic materials.
Reinhard X. Fischer, Andrea Gaede-Köhler, Johannes Birkenstock, Hartmut Schneider   +3 more
openaire   +1 more source

Mullite

2022
Abstract Mullite is an important material since it is a major component of all alumino-silicate ceramics. It has a stability field intermediate in composition between sillimanite Al2SiO5 and alumina Al2O3. Diffuse scattering data display a rich diversity of detail.
openaire   +1 more source

Porous mullite templated from hard mullite beads

Journal of the European Ceramic Society, 2011
Abstract Porous mullite bodies were developed by spark plasma sintering (SPS) amorphous mullite beads of about ∼30 μm in diameter at two temperatures, 950 and 1300 °C. Materials showed a close random stacking of solid spheres that retained their original packing but slightly flattened at the contacts in some cases.
E. Garcia, M.I. Osendi, P. Miranzo
openaire   +1 more source

In situ growth of the Y3Si2C2 interphase in SiCf‐reinforced mullite ceramics for enhanced electromagnetic wave absorption

Journal of The American Ceramic Society
To meet the rigorous demands placed on electromagnetic (EM) wave absorbing (EWA) materials by harsh service conditions and to reduce EM wave power density, the development of ceramic‐based EWA materials with high reliability and stability has become a ...
Lan Long, Yuting Zhang, Henghai Zhu, Yujia Nie, Wei Zhou, Yang Li   +5 more
semanticscholar   +1 more source

Nanocomposite Mullite/Mullite Powders by Spray Pyrolysis

Journal of Nanoparticle Research, 1999
A mullite/mullite nanocomposite powder has been synthesized, composed of nanometer-size 3Al2O3 2SiO2 (‘3 : 2’) mullite precipitates within a matrix of the high alumina 2Al 2O3 SiO2 (‘2 : 1’) mullite. Historically, the transition from the metastable high-alumina phase to the thermodynamically stable ‘3 : 2’ phase of mullite has been thought to be a ...
Daniel M. Dabbs, Nan Yao, Ilhan A. Aksay
openaire   +1 more source

Coprecipitation-derived mullite and mullite-zirconia composites

Journal of Materials Science, 1991
Precursor powders of mullite-zirconia (0–40 wt% ZrO2) were prepared by a hydroxide coprecipitation method and their behaviour during calcination between room temperature and 1500 °C was studied using thermal analysis, X-ray diffraction and electron microscopy.
S. Rajendran, H. J. Rossell
openaire   +1 more source

Interfacial Chemistry of Mullite-Mullite Composites

2008
Interfacial chemistry of mullite fiber reinforced-mullite matrix composites was examined using SEM/EDX and scanning AES. All the fibers bond strongly to the matrix and exhibit no sliding during afiber push-in test. Ex­cess Si over AI is found at the fiber-matrix interfaces. AES results show the carbon -layer is nonuniform and in some cases less than 30
Ori Yeheskel, Mari Lou Balmer, David C. Cranmer   +2 more
openaire   +1 more source