Alumina, mullite, and cordierite powder were added to a whiteware porcelain slurry sintered at 1280 °C investigate the correlation between composition strength. The X-ray diffraction patterns of bodies show that no new phase was formed, material remained intact. Except for sample group which added, strength increased as additive content increased. A Rietveld quantitative analysis indicated amor...

Since its discovery in 1959 as a transient nanocrystalline product of the thermal transformation aluminum-rich clays, so-called Al–Si spinel has been object numerous studies aimed at determining composition. In this work, samples obtained from fired kaolinite- and halloysite-containing clays were analyzed using X-ray diffraction, leading to conclude single cubic (space group Fd-3m) form, with a...

The superfluid transition of He-He mixture films adsorbed on alumina powder is studied, with a He superfluid coverage near one layer. With up to 1.3 layers of He added, the transition becomes strongly broadened, indicating a linear increase in the vortex core size for He coverages below one layer. Annealing of the sample mixture at 4.2 K is found to be critically important in ensuring a homogen...

The reaction-bonded aluminum oxide (RBAO) process utilizes the oxidation of attrition-milled Al/Al2O3/ZrO2 powder compacts, that are heat treated in air, to make alumina-based ceramics. A simultaneous mass and energy balance has been used to model the propagation of the ignition front that has been observed during reaction-bonding. The model is used to determine conditions under which ignition ...

Feature Article Segregation of anion (Cl−) impurities at transparent polycrystalline -alumina interfaces Abhishek Tewari a,∗, Farhang Nabiei b,c, Marco Cantoni b, Paul Bowen a, Cécile Hébert b,c a Laboratory of Powder Technology, École Polytechnique Federale de Lausanne, CH-1015, Switzerland b Centre Interdisciplinaire de Microscopie Electronique, École Polytechnique Federale de Lausanne, CH-10...