scholarly journals Experimental modeling of technological stages of the formation of a high dimensional-geometric bimetallic casting

2020 ◽  
pp. 25-35
Author(s):  
Евгений Евгеньевич Абашкин ◽  
Нина Анатольевна Богданова ◽  
Сергей Геннадьевич Жилин ◽  
Олег Николаевич Комаров ◽  
Валерий Викторович Предеин
Keyword(s):  
Electrical Conductivity ◽  
Investment Casting ◽  
Mechanical Characteristics ◽  
Steel Frame ◽  
Elastic Response ◽  
High Dimensional ◽  
Geometric Accuracy ◽  
Technological Parameters ◽  
Casting Method ◽  
Ferrous Alloys

Изготовление биметаллических деталей позволяет реализовать в них комплекс эксплутационных и механических характеристик, присущих железоуглеродистым и цветным сплавам. Реализация процесса разрабатываемой технологии формирования биметаллического литья с жестким стальным каркасом и поверхностью из цветных сплавов, обладающих большими, чем материал каркаса пластичностью и электропроводностью, возможна за счет применения модернизированного метода литья по выплавляемым моделям. Изменению подвергается стадия изготовления поверхности выплавляемой модели отливки, которая формируется запрессовкой воскообразного порошка в зазор между пресс-формой и стальным каркасом, что позволяет повысить размерно-геометрическую точность литья за счет устранения теплофизических дефектов. Проблемой в реализации такого подхода является упругий отклик материала. В работе решается задача определения технологических параметров формирования воскообразной поверхности выплавляемой модели биметаллической отливки. The production of bimetallic parts makes it possible to realize in them a set of operational and mechanical characteristics inherent in iron-carbon and non-ferrous alloys. The implementation of the process of the developed technology for the formation of bimetallic casting with a rigid steel frame and a surface made of non-ferrous alloys, which have greater plasticity and electrical conductivity than the frame material, is possible through the use of a modernized investment casting method. The stage of manufacturing the surface of the investment casting model, which is formed by pressing the wax powder into the gap between the mold and the steel frame, is subject to change, which makes it possible to increase the dimensional and geometric accuracy of casting by eliminating thermophysical defects. The problem in implementing this approach is the elastic response of the material. This work solves the problem of determining the technological parameters of the formation of the waxy surface of the melted model of a bimetallic casting.

scholarly journals FORMULATION, CHARACTERIZATION AND STABILITY STUDY OF FAST DISSOLVING THIN FILM CONTAINING ASTAXANTHIN NANOEMULSION USING HYDROXYPROPYLMETHYL CELLULOSE POLYMER

2021 ◽  
pp. 17-22
Author(s):  
LUSI NURDIANTI ◽  
IYAN SOPYAN ◽  
TAOFIK RUSDIANA
Keyword(s):  
Thin Film ◽  
Mechanical Characteristics ◽  
Storage Conditions ◽  
Stability Study ◽  
Matrix System ◽  
Stability Studies ◽  
Casting Method ◽  
Hydroxypropylmethyl Cellulose ◽  
The Stability ◽  
Physical And Mechanical Characteristics

Objective: The present study was conducted to formulate and characterize the thin film containing astaxanthin nanoemulsion (TF-ASN) using Hydroxypropylmethyl Cellulose (HPMC) polymer as a film matrix system. The stability studies in different storage conditions were also performed. Methods: Astaxanthin nanoemulsion (As-NE) was prepared by using self-nanoemulsifying method, followed by incorporation into the HPMC matrix system by solvent casting method to forming TF-ASN. Evaluation of TF-ASN was performed by physical and mechanical characterizations. Stability study was carried out in both of accelerated (temperature of 40±2 °C/75±5% RH) and non-accelerated (at ambient temperature) conditions. Assay of astaxanthin in individual TF-ASN was determined compared to pure astaxanthin. Results: TF-ASN had good physical and mechanical characteristics that suitable for intraoral administration. Conclusion: For the study of stability under different storage conditions, it was proven that nanoemulsion form was packed in a HPMC matrix could enhance the stability of the astaxanthin.

scholarly journals Heat transfer in the mold during vertical continuous casting of steel

2018 ◽  
pp. 26-30
Author(s):  
E. I. Marukovich ◽  
E. B. Demchenko
Keyword(s):  
Heat Transfer ◽  
Temperature Regime ◽  
Thermal State ◽  
Effective Means ◽  
Experimental Studies ◽  
Casting Process ◽  
Continuous Casting Of Steel ◽  
Technological Parameters ◽  
Casting Method ◽  
Calculation Technique

The analysis of the performed researches has shown that the offered calculation technique is an effective means of management of formation process in casting. The found dependences and experimental data allow to calculate the specific value of the exactм heat flux in a given range of technological parameters obtained during a series of successful experiments for a particular casting method.Having the results of studies of the temperature regime of the mold during casting of a certain size and profile, it is possible to calculate the thermal state of the mold for the same casting process, but for the production of castings of any other size and profile.Having a certain amount of information on the temperature regime of the mold at different casting methods, you can use the solutions obtained to become the owner of a database containing the necessary information for solving the problems of solidification of the casting. In the subsequent design of equipment and equipment there is no need for additional experimental studies and analysis of the results.

Effect the Ratio and Particle Size of Glass Powder from Fluorescent Tubes Waste on Electrical Properties of PVA-Glass Composites

2021 ◽  
Vol 19 (10) ◽  
pp. 106-114
Author(s):  
Hani M Hussien
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Dielectric Constant ◽  
Glass Powder ◽  
Dissipation Factor ◽  
Powder Particle Size ◽  
Casting Method ◽  
Glass Composites ◽  
Mixing Ratios ◽  
Solution Casting Method

The polymer composites used in the present study were made of polyvinyl alcohol (PVA) as a matrix and glass powder as a filler. The glass powder was obtained from fluorescent tubes waste. The solution casting method was used to fabricate PVA/glass powder composite. Three groups of samples were prepared. The first was prepared by using PVA with the addition of glass powder (sieved less than 20 μm) in proportions 10, 20, 30, 40, and 50 %. The second: the mixing ratios of PVA and glass powder were 80% and 20%, respectively. The third: The mixing ratios of PVA and glass powder were 60% and 40%, respectively. In Both previous groups, the added glass powder used was sieved with sizes less than 20, 45, 105, and 125 μm. For all samples, the following properties were measured at room temperature: DC electrical conductivity, dielectric constant, electrical conductivity, and dissipation factor. The last three properties were measured with a range of frequencies from 1kHz to 5MHz. DC conductivity increases with increasing of glass powder. It was found that the highest conductivity values are for samples composed of glass powder with a particle size of less than 45 μm for both ratios of glass 20% and 40%. It is also noticed that within most frequencies, the sample with 30% glass has the largest dissipation factor. At 20% filler of glass powder, it is noted that the highest values of the dielectric constant are for samples composed of glass powder with a particle size of less than 45 μm and 125 μm. Below 1 MHz, the effect of glass powder particle size on the AC conductivity is minimal. It is found that the samples containing glass powder (less than 125 μm and 105 μm), have similar and lowest dissipation factor. At 40% filler of glass powder, it is noted that the lowest values of the dielectric constant are for samples composed of glass powder with a particle size little than 105 μm.

scholarly journals Fabrication of Silk Fibroin/Graphene Film with High Electrical Conductivity and Humidity Sensitivity

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1774 ◽  
Author(s):  
Haoran Zhang ◽  
Juntao Zhao ◽  
Tieling Xing ◽  
Shenzhou Lu ◽  
Guoqiang Chen
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Wearable Sensors ◽  
Graphene Film ◽  
Natural Material ◽  
Casting Method ◽  
Good Biocompatibility ◽  
Minimum Resistance

Silk fibroin (SF) is a natural material with good biocompatibility and excellent mechanical properties, which are complementary to graphene with ultrahigh electrical conductivity. In this study, to maximally combine graphene and silk fibroin, a well-dispersed silk fibroin/graphene suspension was successfully prepared in a simple and effective way. Then we prepared a flexible conductive SF/graphene film with a minimum resistance of 72.1 ± 4.7 Ω/sq by the casting method. It was found that the electrical conductivity of the SF/graphene film was related to the water content of the film, and the variation was more than 200 times. Therefore, it will play an important role in the field of humidity sensors. It also has excellent mechanical properties in both wet and dry states. These unique features make this material a promising future in the fields of biomedical applications, wearable sensors, and implantable internal sensors.

Nondestructive testing of mechanical characteristics of aluminum alloys on the basis of their electrical conductivity

2006 ◽  
Vol 42 (7) ◽  
pp. 425-432
Author(s):  
A. N. Khailov ◽  
T. N. Pen’kova ◽  
A. S. Bakunov ◽  
V. F. Muzhitskii ◽  
N. D. Presnov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Aluminum Alloys ◽  
Nondestructive Testing ◽  
Mechanical Characteristics

Numerical Simulation of Solidification Process for Impeller Investment Casting

2011 ◽  
Vol 80-81 ◽  
pp. 961-964
Author(s):  
Jie Zhang ◽  
Kang Wen Li ◽  
Hai Wei Ye ◽  
Dong Qi Zhang ◽  
Peng Wei Wu
Keyword(s):  
Numerical Simulation ◽  
Effective Stress ◽  
Investment Casting ◽  
Strong Influence ◽  
Initial Temperature ◽  
Solidification Process ◽  
Uniform Thickness ◽  
Casting Method ◽  
Pouring Temperature

Investment casting method can fabricate the impeller slots with non-uniform thickness and distorted surface. The process of investment casting can be simulated by employing ProCAST software. The mesh of the casting was introduced in the article. The influence about the initial temperature of shell on the defects of the casting and the pouring temperature and the pouring speed on the effective stress of the casting was studied in this article. When the initial temperature of shell was 400°C,there was no defect in the casting. The pouring temperature of the casting, will produce a very strong influence on the effective stress. When the pouring temperature in this article was 800°C, the maximum effective stress of the casting was 108MPa.

scholarly journals OPTIMIZATION OF RECEPTURAL-TECHNOLOGICAL PARAMETERS OF MANUFACTURE OF CELLULAR CONCRETE MIXTURE

2020 ◽  
pp. 30-36 ◽  
Author(s):  
Nataliya Alfimova ◽  
Sevda Pirieva ◽  
D. Gudov ◽  
I. Shurakov ◽  
Elena Korbut
Keyword(s):  
Production Efficiency ◽  
Mechanical Characteristics ◽  
Average Density ◽  
Concrete Mixture ◽  
Technological Parameters ◽  
Number Of Factors ◽  
Aerated Concrete ◽  
The Moment ◽  
The Impact ◽  
Cellular Concrete

aerated concrete at the moment is one of the perspective thermal insulation materials. However, the production of high-quality aerated concrete products is associated with a number of difficulties, primarily related to the features of the manufacturing technology and, in particular, to the formation of its structure during the period of gas evolution and the impact on this process of a large number of factors. The best conditions for the formation of cellular concrete are created when the maximum gas release and the optimum values of the plasticity-viscous characteristics of the aerated concrete mixture are found. Achieving optimal conditions is extremely difficult, which leads to a deterioration in the physico-mechanical characteristics of the final products. One of the ways to solve this problem is to increase the amount of mixing water, however, along with a positive effect (reducing the viscosity of the system), this leads to a decrease in the gas-holding capacity of the mixture. In this connection, the possibility of increasing the production efficiency of the cellular concrete mixture by optimizing the recipe-technological parameters was considered. With the help of the method of mathematical planning, a three-factor experiment was carried out, as the factors of variation were: the duration of the preliminary aging of the mixture, the dosage of the blowing agent and the water-hard ratio, the output parameters were the compressive strength and the average density of the final products. The obtained results made it possible to reveal the regularities of the change in the output parameters from the variable factors and to establish that the preliminary aging of the mixture before the introduction of the gassing agent positively affects the structure and, as a consequence, the physico-mechanical characteristics of the final products.

scholarly journals Experimental analysis of microstructure and mechanical characteristics of LM6 & fly ash composite through stir casting method

2021 ◽  
Vol 2070 (1) ◽  
pp. 012177
Author(s):  
A K Dhar ◽  
G Sutradhar
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Mechanical Characteristics ◽  
Stir Casting ◽  
Optical Microscope ◽  
Production Costs ◽  
Al Alloy ◽  
Casting Method ◽  
Needle Structure ◽  
Semi Solid

Abstract Fly ash has received a lot of attention as a possible support for aluminium alloy composites (AMCs) to improve characteristics while lowering production costs. Al alloy MMC was made with different amounts of fly ash (2, 5, and 8%). The semi-solid state mould was gradually filled with reinforced particles. The optical microscope investigation of the microstructure of AMCs reveals homogenous fly ash dispensation. With the increase in fly ash particulate, the microstructure with refined composition displays reducing Si-needle structure and extending space of eutectic-Al grid space. While hardness increases by 88 percent, tensile strength increases by 57 percent and yield strength by 17 % of the AMCs with the increment of fly ash. The addition of fly ash particles improved the AMCs’ physical and mechanical qualities. As a result, it leads to upgrade the energy utilisation.

scholarly journals The electrical and mechanical properties of Cadmium chloride reinforced PVA:PVP blend films

2020 ◽  
Vol 12 ◽  
pp. 120006
Author(s):  
Rana S. Mahmood ◽  
Sabah A. Salman ◽  
Nabeel Ali Bakr
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Polymer Blend ◽  
Weight Ratio ◽  
Experimental Results ◽  
Casting Method ◽  
Ac Electrical Conductivity ◽  
Elongation At Break ◽  
Blend Films ◽  
Reinforced Polymer

In this study, pure polymer blend (PVA:PVP) film and salt (CdCl2·H2O) reinforced polymer blend films were prepared at different weight ratios (10 wt%, 20 wt%, 40 wt%) using the casting method. The effect of the salt weight ratio on the dielectric properties of the polymer blend films reinforced by CdCl2·H2O salt were investigated, and the experimental results showed that the dielectric constant and the dielectric loss factor decreased as the frequency increased for all polymer blend films. Moreover, the above-mentioned properties increased with increasing salt weight ratios at the same frequency. The experimental results also showed an increase in AC electrical conductivity with increasing frequency, for all polymer blend films, and the AC electrical conductivity also increased with an increase in the weight ratio of the salt at the same frequency. The effect of the salt weight ratio on the mechanical properties of the salt-reinforced PVA:PVP polymer blend films was also studied. The experimental results obtained from the tensile test of the salt-reinforced polymer blend films show significant change in the values of tensile strength, elongation at break, and Young’s modulus with increasing salt weight ratios; the hardness value first increases then decreases with increasing salt weight ratios, and the fracture energy value increases with increasing salt weight ratios, thus they could be good candidates for hard adhesives with low flexibility.

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