Al2O3-SiO2 diphasic gel was synthesized by sol gel route from aluminium nitrate and silicic acid following aqueous phase colloidal interaction. The precursor gel powder was thoroughly characterized by chemical analysis, measurement of surface area and bulk density measurement. The gel powder was further characterized by thermogravimetry, XRD diffraction stud...

Alumina-Mullite-Zirconia ceramic composites were prepared by reaction sintering of alumina, zircon mixture and the sintering aids of magnesia and titania at temperatures of 1400 and 1600 C for 2 hours. The development of different phases and microstructures of the composites were analysed to assess the relative influence of the additives on the formation of alumina-zirconia-mullite compos...

The process of mullitization of kyanite concentrate was studied at different conditions of heat treatment (1400– 1600 °C and 0.5 – 3.5 hours) and particle size of raw materials (38-300 ?m). Kyanite concentrate was obtained fromore-dressing of kyanite deposits of Mishidowan-Bafgh region at 100 km northeastern part of Yazd. The results ofmicrostructure (shape, distribution and size of the grains)...

A slurry process was employed to develop advanced environmental barrier coatings (EBCs) for SiC based composites. Yb2Si2O7 and mullite (3 Al2O3?2 SiO2) were chosen as the base materials bond coat enable temperatures beyond melting point of current silicon (1414 °C). Various sintering aids, such mullite, Yb2Si2O7, Al2O3, enabled at 1500 °C – 1550 °C. used top provide water vapor recession resist...

The refractory materials used in the wall of furnaces for glass melting can be prepared from mullite-zirconia composite material. mullite/zirconia was synthesized Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were various ratios zirconia, compositions selected Al2O3-SiO2-ZrO2 phase diagram. different steps beginning milling...

A mullite-supported Rh catalyst with an unusual crystalline structure in favour of high-temperature reactions was applied for the first time to the catalytic decomposition of N(2)O propellants, and has shown a promising initial activity and thermal stability.

An optimized recipe for 3D printing of Mullite-based structures was used to investigate the effect MgO sintering additive on processing stages and final ceramic properties. To achieve dense 3:2 mullite, filaments were prepared based an alumina powder, a methyl silicone resin, EVA elastomeric binder powder. Using 1 wt% dwell time 5 h at 1600 °C, mullite structure could be obtained from with diam...

Fly ash is an aluminosilicate and the major by-product from coal combustion in power stations; its increasing volumes are economic environmental concerns, particularly since it one of largest mineral resources based on current estimates. Mullite (3Al2O3·2SiO2) only stable phase Al2O3-SiO2 system used numerous applications owing to high-temperature chemical mechanical stabilities. Hence, fly off...