The alumina-silica phase relations of samples annealed in oxygen and quenched were studied by optical microscopy, image analysis, X-ray diffraction, and the electron microprobe. The solid solution boundaries of mullite changed with increasing temperature and joined at 1890°C and a composition of ...
Mullite is rarely found in nature,is the only stable compound in the alumina-silica phase diagram and is an important constituent of refractory and enginee... M Hosseinzadeh,K Farahani,S Sahakian,... - Sixth International Symposium on Refractories 被引量: 0发表: 2012年 Influence of Grain Ph...
When substituting for silica, alumina makes the glass more ductile and elastic. -The ratio of SiO2 to Al2O3 is often referred to as an indicator of glaze matteness (low ratios are more matte). However if there are any other glasses (like B2O3) these have to be rationalized into the ...
The composite's largest component by weight is silica filler, added to provide control of thermal expansion coefficient, thermal conductivity and enhance the material toughness. The molding compound was also designed for moisture resistance and manufacturability. Intel optimizes the silica filler size ...
A method of making alumina-silica glass and other powders The green part is converted to a dense body at low temperatures, typically a couple of hundred degrees Celsius above the glass transition temperature. The treatment incorporates initial drying, sintering, nucleation, and crystal growth all.....
silica and alkalis (e.g. NaO) can segregate at grain boundaries, and their dissolution in physiologic liquids may lead to accelerated fatigue fracture.26For the same reason, the content in MgO added to alumina as a sintered additive to enhance densification while preventing discontinuous grain grow...
An example is given in the following two Figures, from which the ratio of sodium oxide to silica (N/S) for the precursor called 2NS. Fig. 1 shows a binary phase diagram of a sum of 2% of SiO2 and Na2O in an alumina system (i.e. 98 % of the total composition) generated using ...
(c) desilicating said separated first leach liquor and separating the precipitated silicates from said liquor; (d) precipitating Al(OH)3 crystals from the desilicated liquor of step (c) to recover the Al values therefrom; (e) calcining said Al(OH)3 crystals to produce alumina; (f) ...
There is provided a process for the preparation of spherical corundum particles having a bulk density between 1.5 kg / l and 2.5 kg / l, said alumina with the addition of 0.1 to 1% of silica sand is melted in an electric arc furnace, the... J Alary,S Sachse 被引量: 0发表: 2005年...
Phase equilibrium relations in the celsian-silica-alumina portion of the system BaO-Al 2 O 3 SiO 2 were revised on the basis of data obtained from isothermal firing and from the quenching method. These data verify the existence of a celsian-silica compatibility join by reducing the extent of...