scholarly journals Influence of pH liquid for mixing gypsum binders on the strength of gypsum composites

2020 ◽  
Vol 315 ◽  
pp. 10001
Author(s):  
Victoria Petropavlovskaya ◽  
Maria Zavadko ◽  
Tatiana Novichenkova
Keyword(s):  
Chemical Composition ◽  
Structure Formation ◽  
Pore Fluid ◽  
High Density ◽  
Material Composition ◽  
Natural Minerals ◽  
Influence Of Ph ◽  
Properties Of Composites

The influence of fluid acidity on the processes of hardness, mechanism, kinetics, properties of gypsum stone are of great interest.Studies of these processes for modified composites based on gypsum and heavy high density and basalt additives can improve the modifier's effectiveness. The influence of the pH of a liquid on the processes of structure formation and the properties of composites is determined in this work. It is shown that the pH should be shared by other structure-forming factors. This is the chemical composition of basalt waste, its percentage, the interaction of its oxides with pore fluid and natural minerals are the products of their reaction. The regulation of the material composition of composites can enhance the properties and also lead to degradation of structures.

scholarly journals Reaction extrusion of organic-inorganic hybrid gels based on modified polyolefins and dressed mineral fillers

2021 ◽  
pp. 57-61
Author(s):  
N. T. Kakhramanov ◽  
R. V. Kurbanova ◽  
A. D. Quliyev ◽  
V. S. Osipchik
Keyword(s):  
High Density Polyethylene ◽  
Physicomechanical Properties ◽  
High Density ◽  
Dicumyl Peroxide ◽  
Hybrid Gels ◽  
Inorganic Hybrid ◽  
Natural Minerals ◽  
Mineral Fillers ◽  
Technological Mode

The article discusses the technological features of the reaction extrusion of nanocomposites based on dressed natural minerals and high density polyethylene modified with compatibilizer and polypropylene. Clinoptilolite, vesuviane, bentonite and talc were used as natural minerals. The optimal technological mode of reaction extrusion was selected. Dicumyl peroxide in the amount of 0.25 and 0.5 wt.% was used as a vulcanization agent. The influence of technological features of reaction extrusion on the basic physicomechanical properties of nanocomposites based on polyolefins is considered.

Physicomechanical properties of composites based on various types of polyethylene and aluminum

2020 ◽  
Vol 10 ◽  
pp. 48-55
Author(s):  
H. V. Allakhverdiyeva ◽  
◽  
N. T. Kakhramanov ◽  
I. I. Ismayilov ◽  
◽  
...  
Keyword(s):  
Tensile Stress ◽  
High Density Polyethylene ◽  
Ultimate Tensile Stress ◽  
High Density ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Aluminum Particles ◽  
Elongation At Break ◽  
Elastic Module ◽  
Properties Of Composites

The paper presents the results of a study of the effect of aluminum content on the physic-mechanical properties of composites based on high density polyethylene and low density polyethylene. The properties of metal-filled composites, such as ultimate tensile stress, elongation at break, elastic module, melt flow rate, and heat resistance, were studied. According to the data obtained, the loading of aluminum into the composition of low density polyethylene contributes to a monotonic increase in the ultimate tensile stress and the elastic module. When aluminum is loading into the composition of high density polyethylene, on the contrary, a natural decrease in the ultimate tensile stress and elongation at break of the composites is observed. It is shown that when using a compatibilizer, which is polyethylene modified with maleic anhydride, a significant increase in the ultimate tensile stress of high-density polyethylene composites is observed. A schematic representation of the structure of composites with an interpretation of the probable mechanism of hardening of the material in the presence of a compatibilizer is given. It is shown that the crystallinity of the initial polyethylene has a significant effect on the hardening effect of composites. Electron microscopic micrographs of the structure of a filled composite without and with compatibilizer are given. A comparative assessment shows that in the presence of a compatibilizer, aluminum particles are in the bulk of the polymer matrix, i.e. are not in an isolated state. It is assumed that HDPE macrochains free of maleic anhydride (MA) are involved in the formation of crystalline formations, and small sections of macrosegments containing polar groups of MA are concentrated mainly in amorphous regions and in defects in crystalline structures in the form of passage chains. The concentration of PEMA macrosegments containing MA in the narrow amorphous space of HDPE favorably affects the increase in the adhesive forces of interaction on the surface of aluminum particles, which affects the preservation of the ultimate tensile stress at a relatively high level over a wide range of aluminum concentrations.

Effect of Technical Carbon the Deformation-Strength Properties of Low Pressure Polyethylene

2020 ◽  
Vol 869 ◽  
pp. 229-233
Author(s):  
Timur A. Borukaev ◽  
Abubekir Kh. Shaov ◽  
Raisa D. Archakova ◽  
Zakhirat Kh. Sultigova
Keyword(s):  
Carbon Black ◽  
Polymer Matrix ◽  
High Density Polyethylene ◽  
Entire Range ◽  
Filler Content ◽  
Strength Properties ◽  
Optimal Combination ◽  
High Density ◽  
Strength And Ductility ◽  
Properties Of Composites

The influence of carbon black on the deformation-strength properties of high density polyethylene is considered. It was found that the deformation-strength properties of the polymer matrix change over the entire range of the filler content. The amount of carbon black that can be introduced into high-density polyethylene and obtained a composite material with the optimal combination of stiffness, strength and ductility is established. It was shown that the change in the deformation-strength properties of composites is due to the behavior and influence of carbon black particles on the structure of the polymer matrix.

Conceptual Approach to Development, Structure Formation and Hardening Micro-Alloyed by Steels for the Metallurgical Tool

2020 ◽  
Vol 299 ◽  
pp. 658-663
Author(s):  
S.E. Krylova ◽  
Sergey V. Gladkovskii ◽  
E.V. Romashkov
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Chemical Composition ◽  
Structure Formation ◽  
Structural Parameters ◽  
Structural Transformations ◽  
Conceptual Approach ◽  
Phase And Structural Transformations ◽  
Technological Cycle ◽  
Development Structure

The scientific bases for the development of rational compositions and methods for hardening a large-sized metallurgical tool from micro-alloyed steels are stated. Based on the generalization of the experimental data, the regularities of phase and structural transformations at various stages of the technological cycle are revealed; the relationships between structural parameters, chemical composition and mechanical properties have been studied and described.

Surfactant Influence on the Tribological Properties of Bentonite-Based Greases

2005 ◽  
Author(s):  
A. K. Pogosian ◽  
T. R. Martirosyan
Keyword(s):  
Tribological Properties ◽  
High Pressures ◽  
Nano Particles ◽  
Ammonium Salts ◽  
Quaternary Amine ◽  
Wear Properties ◽  
Natural Minerals ◽  
New Type ◽  
Plastic Lubricants ◽  
Properties Of Composites

Development of new type plastic lubricants capable of sustaining high pressures is thus important by using natural minerals. The effect of surfactant ration and structure of thickener nano-particles surfaces on the tribological properties of bentonite-based greases was studied. The best anti-friction and anti-wear properties of plastic lubricants were revealed at the particles modified by quaternary amine and urotropine type ammonium salts, and the necessary ratio for the bentonite particles surface modification by quarterly ammonium salts was revealed, which provide the best tribological properties of composites.

Research of Effect of the Powder Material Quality in the Structure Formation of the DLD Inconel 718 Samples

2019 ◽  
Vol 822 ◽  
pp. 404-409
Author(s):  
S.S. Silchonok ◽  
G.G. Zadykyan ◽  
Oleg G. Zotov ◽  
Iuliia N. Morozova
Keyword(s):  
Chemical Composition ◽  
Nickel Alloy ◽  
Structure Formation ◽  
Powder Material ◽  
Inconel 718 ◽  
High Speed ◽  
Laser Deposition ◽  
Structure And Properties ◽  
Direct Laser ◽  
Deposition Technology

This article is devoted to Inconel 718 heat-resistant nickel alloy. Comparison of samples obtained by high-speed direct laser deposition technology of powders from different manufacturers on their structure and properties was carried out. The dependence of the influence of the chemical composition of the powders on the formation of defects in the studied samples was established

Formation of detrital clay grain coats by dewatering of deep-water sands and significance for reservoir quality

2019 ◽  
Vol 89 (12) ◽  
pp. 1231-1249 ◽  
Author(s):  
Kristin W. Porten ◽  
Michał J. Warchoł ◽  
Ian A. Kane
Keyword(s):  
Pore Space ◽  
Pore Fluid ◽  
High Density ◽  
Seafloor Topography ◽  
Abrupt Decrease ◽  
Norwegian Sea ◽  
Seabed Topography ◽  
Gravity Flows ◽  
Rapid Deceleration ◽  
Hybrid Event

ABSTRACT Well-developed detrital clay grain coats are observed in deep-marine sandstones of the Upper Cretaceous Springar Formation of the Vøring Basin in the Norwegian Sea. The detrital clay coats form thin and compact rims on individual sand grains and meniscus-shaped bridges between grains. These well-developed coats are found in high-density turbidites and proximal hybrid event beds with common to pervasive dewatering structures deposited in proximity to the base of a syndepositionally active basin high. Here, in one exploration well, detrital clay grain coats are common throughout a sandstone package 100 m thick. High-density turbidites and proximal and distal hybrid event beds drilled in mid- to distal-fan settings unaffected by seismically resolved seafloor topography show common dewatering features, but have only scattered detrital clay coats confined to individual dewatering pipes or dish structures. Hence, we propose that intense sediment dewatering has the potential to form detrital clay coats in deep-marine sandstones by a combination of elutriation and reorganization of clays during fluid escape from sediment bodies with pore fluid pressures significantly higher than the hydrostatic pressure. In submarine fan systems, deposition of sediment with coeval trapping of large volumes of interstitial pore fluid is most likely to occur where gravity flows undergo rapid deceleration in response to an abrupt decrease in confinement or gradient. Such environments include the channel–lobe transition and settings in proximity to seabed topography. The investigated sandstones are quartz arenites and subarkoses, with minor to moderate volumes of quartz cement (up to 6%). However, strongly to completely quartz-cemented intergranular pore space is observed where detrital clay coats or matrix does not cover quartz grains in the deepest part of the studied formation. Modeling of quartz cementation predicts that most intergranular macroporosity in the lower part of the Springar Formation would be quartz cemented if the sandstones were free of detrital clays. Based on our observations and modeling results we propose that intense sediment dewatering has the potential to form detrital clay coats, which can be important for retaining porosity in deeply buried sandstones and in basins with high present or past heat flow.

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