In this study, iron tailings were used as raw materials mixing with Al2O3, SiO2, and/or CaO sintered at 950–1400 °C to produce glass ceramics. Al2O3/tailing and Al2O3/SiO2/tailing systems, the newly formed crystalline mullite (3Al2O3·2SiO2) reached its maximum content of 83.7 wt% for sample mass ratio 6/2/2. Al2O3/SiO2/CaO/tailing system, anorthite (CaAl2Si2O8) increased 72.9 7/8/4/6 1450 °C. T...

OBJECTIVES This study evaluated the influence of air-particle abrasion protocols on the surface roughness (SR) of zirconia and the shear bond strength (SBS) of dual-polymerized resin cement to this ceramic. MATERIALS AND METHODS Sintered zirconia blocks (n = 115) (Lava, 3M ESPE) were embedded in acrylic resin and polished. The specimens were divided according to the 'particle type' (Al: 110 µ...

BaO -SiO2-Al2O3 glass ceramics containing K2O and B2O3 were prepared using conventional melting of powered batches, quenching in water and crystallization of sintered glass. XRD patterns introducehexacelsian and celsian as two major crystallized phases in sintered glass-ceramics. Presence of K2O enhances crystallization of hexacelsianin comparison withB2O3.Observations showed sintering temperat...

B2O–SiO2 borosilicate glasses in a specific composition range show spinodal-type phase separation by heat-treatment at around those glass transition temperatures, and porous or glass-ceramics can be easily obtained via an acid treatment after the separation. We have studied preparation conditions of SrTiO3-precipitated for photocatalyst hydrogen generation using solar energy. It was found that ...

The controlled precipitation of strontium fluoroapatite crystals was studied in four base glass compositions derived from the SiO2-Al2O3-Y2O3-SrO-Na2O-K2O/Rb2O/Cs2O-P2O5-F system. The crystal phase formation of these glasses and the main properties of the glass-ceramics, such as thermal and optical properties and radiopacity were compared with a fifth, a reference glass-ceramic. The reference g...

On the basis of RO–Al2O3–SiO2 system, radiotransparent ceramic materials cordierite, celsian, and anorthite composition, which have low dielectric characteristics, are obtained. These requirements met by one main phases BaO–Al2O3–SiO2 system – celsian (BaAl2Si2O8), melting point is 1740 °C, beginning active phase formation occurs at a processing temperature 1300 as well SrO–Al2O3–SiO2 slavsonit...

Abstract The major issue studied in this paper is a natural mineral aggregate of quartz, calcite, and fluorapatite (the raw material originated from Bulgaria) before after high energy milling thermal treatment, the order to investigate properties CaO-SiO2-P2O5 ceramic system. activation effects are monitored by chemical analysis, X-ray powder diffraction, Fourier transformed infrared spectrosco...