scholarly journals Effect investigation of a thinning additive on the physical and mechanical properties of celsian ceramics obtained by slip casting

2020 ◽  
Vol 120 ◽  
pp. 144-150
Author(s):  
G. V. Lisachuk ◽  
Ya. М. Pitak ◽  
R. V. Krivobok ◽  
A. V. Zakharov ◽  
V. V. Voloshchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Slip Casting ◽  
Physical And Mechanical Properties ◽  
Planetary Mill ◽  
Maximum Temperature ◽  
Muffle Furnace ◽  
Technological Parameters ◽  
Optimal Amount ◽  
Second Stage ◽  
Casting Slip

The article discusses the physical and mechanical regularities of ceramics formation based on the BaO—Al2O3—SiO2 system by slip casting into gypsum molds, and also investigates the rheological properties of a slip based on сelsian and the physicochemical properties of products made from it. The samples were made according to the following technology: the first stage is synthesis of celsian in a muffle furnace at a temperature of 1200 °C with a maximum temperature holding for 2 hours. The synthesis products were ground in a planetary mill to a residue on the № 0063 sieve of no more than 0.2 %. Then, slips with different moisture content without additives and with the addition of 0.10, 0.15 and 0.20 wt. % thinning additive Dolapix PC 67 were made. The second stage is to obtain samples by casting slip into gypsum molds. Firing of products took place in a muffle furnace at a temperature of 1350 °C with a two-hour holding. The optimal amount of thinning additive in the celsian slip was determined, which corresponds to 0.10 wt. %. It was found that, in the studied area of technological parameters, the material acquires the best properties at a sample firing temperature of 1350 °C and is characterized by the following indicators: water absorption — 10.20 %, apparent density — 2.15 g/cm3, open porosity — 21.04 %.

scholarly journals Influence investigation of technological parameters on the properties of celsian­slavsonite ceramics

2019 ◽  
Vol 119 ◽  
pp. 82-88
Author(s):  
Ya. М. Pitak ◽  
G. V. Lisachuk ◽  
R. V. Krivobok ◽  
A. V. Zakharov ◽  
V. V. Voloshchuk ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Phase Composition ◽  
Planetary Mill ◽  
Maximum Temperature ◽  
Technological Parameters ◽  
Second Stage ◽  
Stage Synthesis ◽  
Two Stages ◽  
The Relationship

The article discusses the manufacturing technological parameters of a radiotransparent ceramic celsian­slavsonite material Ba0.5Sr0.5Al2Si2O8 in a ratio of their crystalline phases of 50:50. The technology for creating the prototype took place in two stages. The first stage — synthesis of combined celsian­slavsonote briquette was carried out in a silica furnace with an accelerated mode: the temperature set speed was 15 deg/min, the maximum firing temperature was 1300  C with holding for 1 hour. Then the synthesized briquette was ground in a planetary mill for 10 minutes (< 0.063 mm). The second stage took place at temperatures of 1300, 1350 and 1400  C with holding at a maximum temperature of 1, 2 and 3 hours. Studies of samples on dielectric properties, water absorption and open porosity were carried out. The phase composition of obtained materials and their microstructure were investigated. The relationship between a dielectric constant and a grain size of the crystalline phase (Ba0.5Sr0.5Al2Si2O8) was established. The best indicators had the samples burned at a temperature of 1300—1350  C in an oxidized environment, with holding at a maximum temperature of 1—2 hours (ε = 4.264.52, W = 1.842.31  %, Pоpen = 4.355.43  %).

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS

2020 ◽  
pp. 451-457
Author(s):  
Aleksandr Yur'yevich Vititnev ◽  
Yuriy Davydovich Alashkevich ◽  
Natal'ya Geral'dovna Chistova ◽  
Roman Aleksandrovich Marchenko ◽  
Venera Nurullovna Matygullina
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Production Method ◽  
Strength Properties ◽  
Grinding Process ◽  
Technological Parameters ◽  
Fiber Materials ◽  
Traditional Construction

This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established  parameters process. A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF BLENDED BRICKS WİTH FLY ASH BASED, BLAST FURNACE SLAG ADDITION

2019 ◽  
Vol 7 (1) ◽  
pp. 126-136
Author(s):  
Hakan Çağlar ◽  
Arzu Çağlar
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Physical And Mechanical Properties ◽  
Industrial Wastes ◽  
Second Stage ◽  
Volume Weight ◽  
History Of ◽  
Furnace Slag

In this study, it is aimed to make improvements on blended brick (1) which is the first building material has a history of at least 10,000 years. To the blended brick which is a traditional material was kept constant at 5% the addition of fly ash which is industrial waste. It was aim of determine of the effect on the physical and mechanical properties of the blended brick using different ratios (5%, 10%, 15% and 20%) blast furnace slag. In the first stage, the production of fly ash-based blast furnace slag doped sample of blended brick was performed. In the second stage, a variety of experiments were applied to determine the physical and mechanical properties of the blended brick sample. As a result; It has been determined that unit volume weight and compressive strength decreases with the use of industrial wastes in blended brick production. They have occured an increase in porosity and capillary water absorption values. The use of industrial wastes in the production of blended bricks will contribute both improve the properties of the bricks and   the reduction of wastes left to the environment.

scholarly journals METHOD OF SAMPLE MANUFACTURING FROM MULTILAYER COMPOSITE MATERIALS FOR STUDYING THEIR MECHANICAL PROPERTIES

2018 ◽  
pp. 16-23
Author(s):  
Alsaid Mazen ◽  
Ali Salamekh
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Polymer Composite ◽  
Testing Machine ◽  
Physical And Mechanical Properties ◽  
Polymer Composite Materials ◽  
Technological Parameters ◽  
Cutting Out ◽  
Method Of Production ◽  
Economic Considerations

In the last decades there is increasing the need to apply polymer composite materials in different industries, particularly in shipbuilding. There are developing single structures made from polymer composite materials to be used on board ships. The article focuses on technology of manufacturing slabs from polymer composite materials to carry out mechanical testing in the laboratory special standard units. Mechanical properties of polymer composite materials depend on molding technologies. There has been described a technology of sample manufacturing from polymer composite materials reinforced with glass fiber mat with fiberglass plastics. The technique of testing the specified samples for tensile strength has been considered. The sizes and shapes of the samples as well as the technological parameters of the manufacturing process have been validated, depending on the standard requirements and the technological features of the testing machine. The physical and mechanical properties of the components that make up the composite materials are considered. The sequence of stacking layers for preparation of plates from composite materials is indicated. The dimensions of the plates for cutting out finished samples are determined, depending on the method of production. The way of laying plates from composite materials has been chosen on the base of economic considerations and conditions of accessibility. The obtained results of mechanical properties can be used in solving problems of application of polymer composite materials in shipbuilding, for example, in manufacturing superstructures of some dry cargo vessels.

scholarly journals Acrylic Bone Cements Modified with Graphene Oxide: Mechanical, Physical, and Antibacterial Properties

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1773 ◽  
Author(s):  
Mayra Eliana Valencia Zapata ◽  
Lina Marcela Ruiz Rojas ◽  
José Herminsul Mina Hernández ◽  
Johannes Delgado-Ospina ◽  
Carlos David Grande Tovar
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Bacterial Infections ◽  
Setting Time ◽  
Antibacterial Properties ◽  
Physical And Mechanical Properties ◽  
Maximum Temperature ◽  
Bone Cements ◽  
Gram Negative ◽  
Total Joint Replacements

Bacterial infections are a common complication after total joint replacements (TJRs), the treatment of which is usually based on the application of antibiotic-loaded cements; however, owing to the increase in antibiotic-resistant microorganisms, the possibility of studying new antibacterial agents in acrylic bone cements (ABCs) is open. In this study, the antibacterial effect of formulations of ABCs loaded with graphene oxide (GO) between 0 and 0.5 wt.% was evaluated against Gram-positive bacteria: Bacillus cereus and Staphylococcus aureus, and Gram-negative ones: Salmonella enterica and Escherichia coli. It was found that the effect of GO was dependent on the concentration and type of bacteria: GO loadings ≥0.2 wt.% presented total inhibition of Gram-negative bacteria, while GO loadings ≥0.3 wt.% was necessary to achieve the same effect with Gram-positives bacteria. Additionally, the evaluation of some physical and mechanical properties showed that the presence of GO in cement formulations increased wettability by 17%, reduced maximum temperature during polymerization by 19%, increased setting time by 40%, and increased compressive and flexural mechanical properties by up to 17%, all of which are desirable behaviors in ABCs. The formulation of ABC loading with 0.3 wt.% GO showed great potential for use as a bone cement with antibacterial properties.

scholarly journals REGULATION OF PROCESS AND RECIPE PARAMETERS ON THE BASIS OF MODELING PHYSICAL AND MECHANICAL PROPERTIES OF AUTOCLAVED AERATED CONCRETE

2019 ◽  
Vol 4 (5) ◽  
pp. 36-41
Author(s):  
Роман Шорстов ◽  
Roman Shorstov
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Maximum Temperature ◽  
Molding Sand ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Set Up ◽  
Favorable Conditions ◽  
Mixing Water

The article discusses the possibility of regulation by changing the amount of aluminum paste, the temperature of the mixing water and the sides of mold for the expansion of molding sand of autoclaved aerated concrete. Also, the achievement of a given maximum temperature of the array, which determines the nature of the pore structure and physico-mechanical properties of products. Mathematical models for optimizing the physicomechanical properties of autoclaved aerated concrete by regulating technological and prescription parameters are obtained using the method of mathematical planning of an experiment. It is established, optimal parameters are the mixing water temperature of 40 ... 45 ° C, the amount of aluminum paste - 0.6% of the binder mass, the temperature of the sides of the form 85 ... 90 ° C, which creates favorable conditions for the expansion of the gas-concrete mixture and the combination of pore formation and set-up structural strength of the array, allowing to obtain an optimal porous structure with smaller and uniform porosity with a sufficiently low density and high strength

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