نتایج جستجو برای: andalusite
تعداد نتایج: 131 فیلتر نتایج به سال:
The quartz-aluminosilicate veins in the Hamadan region consist of quartz with one, two or three polymorphs of aluminum silicate )andalusite, kyanite and sillimanite(. In some veins other accessory minerals (i.e. garnet, chlorite, muscovite, staurolite, biotite and plagioclase) are present. The petrogenesis of these veins and their country rocks have been previously described; this paper studies...
Mullite and alumina are common in high-temperature applications because of their low thermal expansion coefficient and good thermal shock resistance. Evolution of SiC in the matrix and using it as reinforcing phase can improve thermo-mechanical properties of these materials. Also, in-situ formation of the reinforcing phases by using inorganic materials is an economical process. In this work, cr...
A very high sensitivity continuous wave NQR spectrometer was developed to detect pure NQR transitions at low frequencies (down to 200 kHz). A signal-to-noise ratio of more than 100 to 1 has been achieved at about 1.36 MHz for crystalline B 2 0 3 . Two large n B responses have been found in vitreous B 2 0 3 (NMR detected only one site) with linewidths of less than 30 kHz. A1 NQR spectra were obt...
The main problem affecting the life of refractory linings in furnaces is alkaline corrosion formed during biomass combustion, especially systems with SiO2–Al2O3. This effect very intensive compared to using conventional technologies designed for burning traditional fuels. study focuses on development a new type andalusite material higher resistance K2CO3 and fly ash after combustion. original l...
Introduction: Chemical interactions between Venus’ atmosphere and surface rocks may be crucial to understanding the atmosphere’s composition [1-3], and to interpreting surface geology and physical properties [2,4,5]. Most studies have emphasized the atmosphere – its composition and ‘chemical sediments,’ and few have focused on what happens to basalts and their minerals in reaction with the atmo...
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