scholarly journals Study of phase composition on resorption glass-ceramic соatings for titanium

2014 ◽  
Vol 1 (6(67)) ◽  
pp. 49
Author(s):  
Галина Миколаївна Шадріна ◽  
Оксана Вікторівна Саввова ◽  
Дарина Юріївна Шемет
Keyword(s):  
Phase Composition ◽  
Glass Ceramic

scholarly journals Influence of SiO2/Al2O3 Molar Ratio on Phase Composition and Surfaces Quality of Aluminum Silicate Sanitary Glazes in the SiO2-Al2O3-CaO-Na2O System

2016 ◽  
Vol 61 (4) ◽  
pp. 1739-1746 ◽  
Author(s):  
M. Leśniak ◽  
J. Partyka ◽  
M. Sitarz
Keyword(s):  
Surface Roughness ◽  
Phase Composition ◽  
Surface Quality ◽  
Glass Ceramic ◽  
Glass Phase ◽  
Molar Ratio ◽  
Aluminum Silicate

Abstract This paper presents the results of research on aluminum silicate sanitary glazes in the SiO2-Al2O3-CaO-Na2O system with different SiO2/Al2O3 molar ratio. XRD, SEM-EDS and FITR measurement indicated that SiO2/Al2O3 molar ratio has a significant impact on the phase composition of the obtained glazes. Glass-ceramic glazes were obtained that consisted of both the glass phase and pseudowollastonite (Ca3[SiO3]3) or anorthite (Ca[Al2Si2O8]) crystals. Subsequently, the influence of phase composition on surface quality (roughness) was examined for the obtained samples. On the basis of the conducted examination of glaze surface roughness was observed that glazes of extreme SiO2/Al2O3 molar ratio are characterized with greatest surface roughness when compared to other glazes.

scholarly journals Alumina silicate glass-ceramic materials for electrical purposes

2020 ◽  
Vol 120 ◽  
pp. 174-185
Author(s):  
O. V. Savvova ◽  
G. K. Voronov ◽  
S. A. Ryabinin ◽  
E. Yu. Fedorenko ◽  
V. D. Timofeev
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Electrical Properties ◽  
Silicate Glass ◽  
Glass Ceramic ◽  
Breakdown Strength ◽  
Chemical Properties ◽  
Ceramic Materials ◽  
Silicate System ◽  
Glass Ceramic Materials

The prospects for use of glass-ceramic materials as electrical products were analyzed. The priority of a self-organized macro- and nanostructure formation of the glass-ceramic materials under conditions of low-temperature heat treatment to ensure their high physical and chemical properties was shown. The choice of an alumina silicate system of materials for obtaining high-strength glass-ceramic materials with improved electrical properties was substantiated, taking into account the aspects of energy saving. The technological modes of cooking, forming and heat treatment of glass-ceramic materials were determined. Resistance, dielectric constant and dielectric loss tangent at 106 Hz were measured using an E6-13A teraometer on a trielectrode system at a temperature of +29 °C and a DE-5000 RLC meter. Electric strength (Em) and cold crushing strength were determined according to GOST 24409-80. Tensile strength according to GOST 32281.1-2013 (EN 1288-1: 2000). The decisive influence on the electrical properties of glass-ceramic materials the crystalline phases of α-cordierite, β-spodumene or lithium disilicate, as well as the residual glass phase composition has been established. The structure influence of the alumina silicate glass-ceramic materials on the provision of their electrical (tgδ∙104 = 70 ÷ 80; ε = 8.0 ÷ 9.3 (at f = 106 Hz); lg ρv = 12.9 ÷ 15.0 (ρv, Ohm·cm at Т = 20 °C) and mechanical (K1C = 3.15 ÷ 4.3 МPа∙м1/2; σ comp = 630 ÷ 700 МPа, σbend = 300 ÷ 350 МPа; KCU = 4.8 ÷ 5.9 kJ/m2) properties. It was found that, the defining condition for the developed glass-ceramic materials use as insulating materials under repeated exposure to high-temperature operations is their high breakdown strength Em = 37 ÷ 42 MV/m and thermal shock resistance due to low TCLE (α∙107 = 21.5 ÷ 31.8 deg-1). The influence of phase composition and structure of the alumina silicate glass-ceramic materials on their electrical and mechanical properties was analyzed. A comparative assessment of the known ceramic and glass-ceramic materials for electrical purposes has made it possible to establish the feasibility of using the developed materials as substrates in the design of a hybrid integrated circuit, vacuum-tight shell and capacitor dielectrics.

Preparation and Characterization of Bioactive and Magnetic Biphasic Thermo-Seeds Material

2013 ◽  
Vol 834-836 ◽  
pp. 301-304
Author(s):  
Jian An Liu ◽  
Xue Na Yang ◽  
Mei Mei Zhang
Keyword(s):  
Magnetic Property ◽  
Phase Composition ◽  
Glass Ceramic ◽  
Body Fluid ◽  
Glass Ceramics ◽  
Magnetic Behavior ◽  
In Vitro Bioactivity ◽  
Magnetic Glass

A novel biphasic material has been synthesized from a melt-derived bioactive glass (45S5) and a glass-ceramic obtained from a melt-derived magnetic glass-ceramics for hyperthermia application. The biphasic material obtained from a mixture 1:1 of these components. The phase composition was investigated by XRD. The magnetic property was measured by VSM. The in vitro bioactivity was investigated by simulated body fluid (SBF) soaking experiment. The glass-ceramic shows magnetic behavior and bioactive, useful for hyperthermia.

scholarly journals Glass-ceramics obtained by the crystallization of basalt

2010 ◽  
Vol 42 (3) ◽  
pp. 383-388 ◽  
Author(s):  
M. Cocic ◽  
M. Logar ◽  
B. Matovic ◽  
V. Poharc-Logar
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Ceramic Material ◽  
Glass Ceramic ◽  
Dynamic Modulus ◽  
Glass Ceramics ◽  
Glass Ceramic Material ◽  
Time Interval ◽  
Approximate Relationship ◽  
Two Phases

The possibility to obtain glass-ceramics from basalt from the locality on Vrelo (Kopaonik mt.) is shown in this paper. The parent rock was ground to fraction -0.4 +0.1 mm, and then melted at 1250 - 1300?C. The crystallization melted bazaltic glass at 950?C during the time interval of 3 hours caused synthesis of a glass-ceramic material with a microstructure that has excellent mechanical properties according to the determined dynamic modulus of elasticity and uniaxial compresive strength. The phase composition of the obtained glass ceramic material was determined by XRPD using Rietveld refinement and SEM. Two phases were found: pyroxene which corresponds to omphacite of the composition (Na0.199 K0.180 Ca0.471 Mg0.249)1.1(Mg0.271Fe0.299Al0.430)1.0(Si1.704Ti0.046Al0.250)2.0O6 and glass with an approximate relationship 69:31.

Glass–ceramic frits for porcelain stoneware bodies: Effects on sintering, phase composition and technological properties

2008 ◽  
Vol 34 (3) ◽  
pp. 455-465 ◽  
Author(s):  
C. Zanelli ◽  
G. Baldi ◽  
M. Dondi ◽  
G. Ercolani ◽  
G. Guarini ◽  
...  
Keyword(s):  
Phase Composition ◽  
Glass Ceramic ◽  
Technological Properties

scholarly journals Fine Biocompatible Powders Synthesized from Calcium Lactate and Ammonium Sulfate

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 391-396
Author(s):  
Maksim Kaimonov ◽  
Tatiana Shatalova ◽  
Yaroslav Filippov ◽  
Tatiana Safronova
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Ammonium Sulfate ◽  
Calcium Oxide ◽  
Glass Ceramic ◽  
Calcium Sulfate ◽  
Calcium Lactate ◽  
Inorganic Glass ◽  
Heat Treated ◽  
Tiny Amount

Fine biocompatible powders with different phase compositions were obtained from a 0.5 M solution of ammonium sulfate (NH4)2SO4 and calcium lactate Ca(C3H5O3)2. The powder after synthesis and drying at 40 °C included calcium sulfate dehydrate CaSO4·2H2O and calcite CaCO3. The powder after heat treatment at 350 °C included β-hemihydrate calcium sulfate β-CaSO4·0.5H2O, γ-anhydrite calcium sulfate γ-CaSO4 and calcite CaCO3. The phase composition of powder heat-treated at 600 °C was presented as β-anhydrate calcium sulfate β-CaSO4 and calcite CaCO3. Increasing the temperature up to 800 °C leads to the sintering of a calcium sulfate powder consisting of β-anhydrite calcium sulfate β-CaSO4 main phase and a tiny amount of calcium oxide CaO. The obtained fine biocompatible powders of calcium sulfate both after synthesis and after heat treatment at temperature not above 600 °C can be recommended as a filler for producing unique composites with inorganic (glass, ceramic, cement) or polymer matrices.

Crystallization sequence of an A1N-Y2O3-SiO2 glass-ceramic

1986 ◽  
Vol 44 ◽  
pp. 446-447
Author(s):  
T.R. Dinger ◽  
G. Thomas
Keyword(s):  
High Temperature ◽  
Glass Ceramic ◽  
Crystallization Behavior ◽  
High Stress ◽  
Crystallization Sequence ◽  
Sio2 Glass ◽  
Structural Applications ◽  
Ceramic Precursors

The use of Si3N4, alloys for high temperature, high stress structural applications has prompted numerous studies of the oxynitride glasses which exist as intergranular phases in their microstructures. Oxynitride glasses have been investigated recently in their bulk form in order to understand their crystallization behavior for subsequent Si3N4 applications and to investigate their worth as glass-ceramic precursors. This research investigates the crystallization sequence of a glass having a normalized composition of Y26Si30Al11 ON11 and lying in the A1N-Y2O3-SiO2 section of the Y-Si-Al-O-N system. Such glasses exist as intergranular phases in the technologically important Y2O3/Al2O3-fluxed Si3N4 alloys.

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