Phase composition, microstructure and properties of aluminosilicate lightweight materials obtained by the method of burnable additives

2020 ◽  
pp. 3-9
Author(s):  
M. Kh. Rumi ◽  
Sh. K. Irmatova ◽  
Sh. A. Fayziev ◽  
M. A. Zufarov ◽  
E. P. Mansurova ◽  
...  
Keyword(s):  
Phase Composition ◽  
Phase Formation ◽  
Fractional Composition ◽  
Raw Materials ◽  
Lightweight Materials ◽  
Microstructure And Properties ◽  
Fine Grained ◽  
Black Clay ◽  
Fine Grained Structure ◽  
Alkaline Oxides

The nature of phase formation and the properties of aluminosilicate lightweight materials created from raw materials from the Angren and Samarkand deposits of Uzbekistan are studied. The phase composition, microstructure, and physicotechnical properties of the compositions with the addition of plastic black clay and a burnable additive in the form of coke of various fractional composition were determined. It is shown that the materials of the Angrenskoye deposit are more prone to cristobalitization, which is due to the low content of alkaline oxides and a fine-grained structure. The optimum complex of properties is possessed by lightweights based on cracked clay with a burnable additive in the form of polyfraction coke. Ill. 3. Ref. 13. Tab. 2.

scholarly journals Properties Comparison of Ti-Al-Si Alloys Produced by Various Metallurgy Methods

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3084 ◽  
Author(s):  
Anna Knaislová ◽  
Pavel Novák ◽  
Jaromír Kopeček ◽  
Filip Průša
Keyword(s):  
Fracture Toughness ◽  
Phase Composition ◽  
Powder Metallurgy ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Compression Tests ◽  
Large Area ◽  
Fine Grained ◽  
Central Porosity ◽  
Fine Grained Structure

Melting metallurgy is still the most frequently used and simplest method for the processing of metallic materials. Some of the materials (especially intermetallics) are very difficult to prepare by this method due to the high melting points, poor fluidity, or formation of cracks and pores after casting. This article describes the processing of Ti-Al-Si alloys by arc melting, and shows the microstructure, phase composition, hardness, fracture toughness, and compression tests of these alloys. These results are compared with the same alloys prepared by powder metallurgy by the means of a combination of mechanical alloying and spark plasma sintering. Ti-Al-Si alloys processed by melting metallurgy are characterized by a very coarse structure with central porosity. The phase composition is formed by titanium aluminides and titanium silicides, which are full of cracks. Ti-Al-Si alloys processed by the powder metallurgy route have a relatively homogeneous fine-grained structure with higher hardness. However, these alloys are very brittle. On the other hand, the fracture toughness of arc-melted samples is immeasurable using Palmqvist’s method because the crack is stopped by a large area of titanium aluminide matrix.

The phase formation processes into a short-circuited galvanic couple iron (St3)-carbon (coke) system in water medium

2020 ◽  
Author(s):  
Olena Lavrynenko ◽  
◽  
Keyword(s):  
Phase Composition ◽  
Phase Formation ◽  
Raw Materials ◽  
Current Model ◽  
Operating Time ◽  
Liquid Waste ◽  
Water Medium ◽  
Chemical Mechanisms ◽  
Formed Precipitate

The monograph presents the results of an experimental study of the galvanic coagulation phase formation process in the system of short-circuited galvanic contacts iron - carbon (coke) that was carried out on the current model of industrial galvanocoagulator, water permeability and model solutions of inorganic salts hydroxide structures in situ. The influence of the galvanocoagulation parameters on the phase composition and mass of the formed precipitate, the value of the hydrogen index and the chemical composition of the dispersion medium are established. The conditions of the galvanic contact system transition to the steady state are discovered and the influence of the operating time of the iron component on the chemical and phase composition of the formed pulp is determined. Physicochemical and colloid-chemical mechanisms of phase formation in the system of short-circuited galvanic pair steel-3 - coke are revealed. The separation possibility of dispersed products of galvanic coagulation process by adaptation of traditional methods of natural raw materials separation is shown. Examples of electrolysis, galvanocoagulation and cementation in technological schemes of liquid waste disposal of galvanic productions are given it the monograph.

The Patterns of Phase Composition and Properties of High-Calcium Low-Density Ceramics Formation Based on Argillous Raw Materials of Various Chemical and Mineralogical Composition

2021 ◽  
Vol 1037 ◽  
pp. 167-173
Author(s):  
Natalia Yatsenko ◽  
Aleksandr I. Yatsenko ◽  
Natalia A. Vil'bitskaya ◽  
Olga I. Sazonova ◽  
Rimma V. Savanchuk
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Raw Materials ◽  
High Strength ◽  
Mineralogical Composition ◽  
Strength Properties ◽  
Low Density ◽  
High Calcium ◽  
Sintering Properties ◽  
Alkaline Oxides

The post-sintering properties of walling high-calcium ceramics based on clay-containing raw materials in low-temperature roasting depend on the chemical-mineralogical composition of clay with different contents of iron, calcium-containing and alkaline oxides that contribute to the formation of new crystalline phases, which provide for the production of low-density ceramic material with high-strength properties.

scholarly journals Regularities of the formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy

2020 ◽  
pp. 55-63
Author(s):  
E. F. Volkova ◽  
V. A. Duyunova ◽  
I. V. Mostyaev ◽  
M. V. Akinina
Keyword(s):  
Fine Structure ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
High Strength ◽  
Fine Grained ◽  
Long Period ◽  
Noticeable Improvement ◽  
Fine Grained Structure ◽  
New Generation

An approach to creating high-strength deformable magnesium alloys for developing a fine-grained structure and a favourable phase composition is considered. The possibility of a noticeable improvement in the characteristics of magnesium alloys by introducing REEs in certain ratios for the formation of long-period phases (LPSO phases) is considered. The regularities of formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy of the VMD16 brand are studied.

Experimental Research on the Qualitative Characteristics of Iron Ores and Ferrous Waste That Can Be Used in Blast Furnace Mixt Injection Technology

2019 ◽  
Vol 70 (11) ◽  
pp. 3835-3842
Author(s):  
Mihai Dumitru Tudor ◽  
Mircea Hritac ◽  
Nicolae Constantin ◽  
Mihai Butu ◽  
Valeriu Rucai ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Experimental Research ◽  
Raw Materials ◽  
Coal Dust ◽  
Production Costs ◽  
Iron Ores ◽  
Fine Grained ◽  
Experimental Laboratory ◽  
Injection Technology ◽  
Direct Use

Direct use of iron ores in blast furnaces, without prior sintering leads to a reduction in production costs and energy consumption [1,2]. Fine-grained iron ores and iron oxides from ferrous wastes can be used together with coal dust and limestone in mixed injection technology through the furnace tuyeres. In this paper are presented the results of experimental laboratory investigations for establishing the physic-chemical characteristics of fine materials (iron ore, limestone, pulverized coal) susceptible to be used for mixed injection in blast furnace. [1,4]. The results of the experimental research have shown that all the raw materials analyzed can be used for mixt injection in blast furnace.

scholarly journals Disintegration process in disc crushers

2013 ◽  
Vol 59 (No. 3) ◽  
pp. 98-104 ◽  
Author(s):  
P. Vaculík ◽  
J. Maloun ◽  
L. Chládek ◽  
M. Přikryl
Keyword(s):  
Food Industry ◽  
Fractional Composition ◽  
Animal Feed ◽  
Raw Materials ◽  
Specific Energy Consumption ◽  
Low Noise ◽  
Main Process ◽  
Industrial Sectors ◽  
The Subject

Grinding or crushing hard raw materials is usually a primary operation which precedes the follow-up technological processes in a number of industrial sectors. A great variety of machines using different principles of fragmentation are employed in the technology of pulverization. The food industry uses roller mills, in which the main process is the shear grinding. In the animal feed industry impact machines known as hammer mills are often used. In recent years, mills have been employed that use their frontal edges for grinding or crushing during the rotation of one of two adjacent discs. The modern design disc machines used for grinding grain have resulted from long development and their operation has a relatively low noise level with reduced dust. The separation process that occurs in the gap between the active edges of the discs can be described as shear grinding and is currently the subject of attention which is focused on the specific energy consumption and fractional composition of the product of grinding.  

scholarly journals Effect of Microstructure and Notches on the Fracture Toughness of Medium Carbon Steel

1970 ◽  
Vol 3 (1) ◽  
pp. 15-22 ◽  
Author(s):  
SK Nath ◽  
Uttam Kr Das
Keyword(s):  
Fracture Toughness ◽  
Carbon Steel ◽  
Tensile Specimen ◽  
Medium Carbon Steel ◽  
Notch Angle ◽  
Medium Carbon ◽  
Fine Grained ◽  
Keywords Fracture ◽  
Fine Grained Structure ◽  
Marine Engineering

Fracture toughness (K1C) of medium carbon steel (0.5% C) has been determined by round notched tensile specimen. Two notch diameters (5.6mm and 4.2mm) and three notch angles (α) namely 45°, 60° and 75° have been used to observe the effect of notch diameters and notch angle on fracture toughness of the steel. By heat treatment the microstructure of the steel is also varied and its effect on the fracture toughness is also observed. It has been found that fine grained structure improves fracture toughness. Lower notch diameter and higher notch angle show higher value of K1C. Keywords: Fracture toughness, microstructure, notch, heat treatmentDOI: 10.3329/jname.v3i1.925 Journal of Naval Architecture and Marine Engineering 3(2006) 15-22

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