5 research outputs found
Features of crystallization of a bioactive alkali free glass
In this work, bioactive alkali free glass was synthesized in the RO-CaF2-P2O5-Al2O3-SiO2 system and the results of crystallization of glass in the temperature range 700-1000 °C were investigated. The glass microstructure, phase composition and structural changes of crystallized glass by powder X-ray diffraction and IR spectroscopy were studied. The effect of temperature on the phase composition of the resulting glass-ceramic material and their amount is established. At 700 °C, fluorapatite is formed with a small amount of anorthite. With an increase in the crystallization temperature, anortite and vitlocite become the main phases, and fluorapatite is present in smaller quantities
SYNTHESIS OF GLASSES IN THE SYSTEM R2O-RO-CaF2-P2O5-Al2O3-SiO2
The structure of glasses synthesized in the R2O-RO-CaF2-P2O5-Al2O3-SiO2 system was studied by scanning electron microscopy. Glasses have a complex heterogeneous structure associated with the formation of germinal or formed crystalline phases, as well as microheterogeneous glass stratification
Peculiarities of mullite formation during heat treatment of shale from the Jerdanak deposit
The chemical and mineralogical composition of the clay slate of the Dzherdanak deposit is determined. Four species were investigated in the natural and heat-treated state in the range of 800-1400 °C using the X-ray method. Established phase changes undergoing breed. The phase composition of the original rock, intermediate substances during roasting up to 1400 oC has been determined. The initial phases in all varieties are quartz and mica of different composition. One variety contains kaolinite. The main phases formed during high-temperature processing are mullite, quartz and cristobalite. The structure of natural and heat-treated samples was studied by scanning electron microscopy. The sizes of mullite crystals are in the range of 3.5 to 0.15 μm, depending on the type of rock. For the three varieties of shale C-1, C-2, and C-3, amorphous regions are separated, separated by a lighter bounded phas
Phase changes in crystallization of some glasses synthesized in the RO-CaF2-P2O5-Al2O3-SiO2 system
The aim of the relearn was to study the phase changes during crystallization of some compositions of biocompatible glasses obtained in the RO-CaF2-P2O5-Al2O3-SiO2 (R=Zn, Mg) system. For this purpose, crystallization of glasses in the range of 700-1000 °C was carried out and X-ray analysis was carried out. A change in the phase composition of crystallized glass with a change in crystallization temperature and composition has been established. During crystallization, the phases of whitlockite, zinc-substituted fluorapatite, fluorapatite, anorthite, and gahnite were identified
Study of phase formation in the system of graphite-kaolin during firing in the inert environment
Fireclay ceramic materials based on the graphite-kaolin system were synthesized using graphite concentrate of Zakhchakhona site and enriched kaolin AKF-78 of the Angren deposit with refractoriness more than 1750 оС. The phase formation of crystals in the part of the graphite-kaolin system were studied by performing a synthesis in a Nitrogen at 1400 ° C in a tube furnace. The main crystalline phases in all compositions are mullite, sillimanite and graphite, in small amounts anorthite, cristobalite and aluminum nitride are present