scholarly journals Sand-sodium-silicate mixtures structured in steam-microwave environment effective values of thermo-physical properties

2021 ◽  
pp. 66-71
Author(s):  
L.I Solonenko ◽  
S.I Repiakh ◽  
K.I Uzlov ◽  
A.V Dziubina ◽  
S.O Abramov
Keyword(s):  
Cast Iron ◽  
Physical Properties ◽  
Sodium Silicate ◽  
Apparent Density ◽  
Quartz Sand ◽  
Thermal Activity ◽  
Solute Content ◽  
Graphite Cast Iron ◽  
Pass Through ◽  
Thermo Physical Properties

Purpose. Sand-sodium-silicate mixtures, structured by steam-microwave solidification, thermo-physical properties integral-effective values during Al-Mg alloy and graphite cast iron pouring determination. Sand-sodium-silicate mixture apparent density changing according to quartz sand, cladded with sodium silicate solute, fractional composition and its influence on BrA9Zh3L bronze microstructure establishment. Methodology. Quartz sand with 0.23 mm average particle size, sodium silicate solute, aluminum alloy with 8.5% Mg, flake graphite cast iron SCh200 (DSTU 8833:2019), bronze BrA9Zh3L (GOST 493-79) were used. Mixtures structuring was carried out in 700 W magnetron power microwave furnace. Sand-sodium-silicate mixture thermo-physical properties integral-effective values were calculated by G.A.Anisovich method, using castings results and molds thermography. Structured mixtures apparent density was determined on samples 50 120 mm dimension. Metallographic studies were realized using Neophot-21 optical microscope. Findings. It was found that with sodium silicate solute, used for sand cladding, amount increasing from 0.5 to 3% mold material apparent density decreases and thermal activity lowers. This leads to castings grains size increasing. Mixture sodium silicate solute content was recommended limiting 1.5% for fine-grained microstructure castings obtaining and cladded sand using, which particles pass through mesh side less 0.315 mm sieve. Sands with sodium silicate solute content more than 1.5%, which dont pass through sieve 0.4 mm mesh side, were recommended as casting molds heat-insulating material using. Originality. For the first time, when aluminum-magnesium alloy and graphite cast iron pouring, quartz sand cladded with sodium silicate solute in amount from 0.5 to 3.0% (weight, over 100% quartz sand), steam-microwave radiation structured, thermo-physical properties integral-effective values were determined. Practical value. Data obtained using will improve castings solidification time and rate analytical calculations accuracy, forecast level and residual stresses sign in them, shrinkage defects locations. This will reduce casting technology developing time and costs and castings manufacturability.

Influence of High Temperature Heat Sources on the Moisture and Temperature Distribution in a Real/Virtual Foundry Sand Mould

2016 ◽  
Vol 7 ◽  
pp. 69-83
Author(s):  
Paweł Popielarski ◽  
Zenon Ignaszak
Keyword(s):  
Cast Iron ◽  
Physical Properties ◽  
Rapid Heating ◽  
Temperature Fields ◽  
Coupled Modeling ◽  
Molding Sand ◽  
Mould Material ◽  
Sand Mould ◽  
Thermal Phenomena ◽  
Thermo Physical Properties

The problem described in the paper concerns the thermo-physical properties of the green mould material to which the cast iron is most often poured. The study includes the experiment of pouring the cast iron plate into green bentonite-sand mould. The temperature fields of casting and in different zones of the mould were recorded. The goal of the study was to determine the substitute thermo-physical properties of mould sand containing the over-moisture zone by means of simulation tests (inverse problem). An originality of the related research is an attempt to take into account the effects of the global thermal phenomena occurring in the quartz sand bonded by bentonite-water binder, by application of the substitute thermal coefficients without using the coupled modeling. In the simulation tests in order to achieve the effect of rapid heating of the mould (below temperatures 100 °C) by poured cast iron (T>1300 °C), the function of the latent heat source and the modified values of substitute thermal conductivity and substitute specific heat of the molding sand were used. In order to facilitate the solution, the mould was divided into zones, in which different starting humidity of molding sand was assumed.

scholarly journals Sand-sodium-silicate mixtures grains composition optimization for structuring by steam-microwave solidification method

2021 ◽  
Vol 1,2021 (1,2021(126)) ◽  
pp. 28-38
Author(s):  
Solonenko Lyudmila ◽  
Repyakh Sergei ◽  
Uzlov Kostiantyn
Keyword(s):  
Sodium Silicate ◽  
Quartz Sand ◽  
Gas Permeability ◽  
Beam Deflection ◽  
Solute Content ◽  
Allowable Level ◽  
Process Manufacturing ◽  
Composition Optimization ◽  
Simplex Lattice ◽  
Process Composition

Abstract. Mixture sizes of sand-sodium-silicate conglomerates and sodium silicate solute content in them influences on the basic physical and technological indicators of molding and core mixtures structured in steam-microwave environment have been investigated. Sand-sodium-silicate mixture structured by steam-microwave environment (steam-microwave solidification method – SMS-process) composition has been optimized. Standard and generally accepted methods and techniques of molding mixtures investigation have beenused in this study. For mixtures manufacturing have been used: quartz sand brand 1K2O202; sodium silicate solute with silicate modulus of 2.8…3.0 and specific gravity of 1.42…1.44 g/cm3. Quartz sand cladding has been implemented with 0.5 and 2.5% sodium silicate solute (by weight, over 100% sand). Sand-sodium-silicate conglomerates have been scattered in sieves and conglomerates with sizes less than 0.315mm and with sizes from 0.315 to 0.63mm have been used for research. Mixture composition has been optimized according to results of simplex planning and experimental data by simplex triangles constructing and superimposing their formatted images on each other with darkened fields between isolines that do not meet of each parameters required level. To plot simplex lattices, model with simplex lattice plan of incomplete cube in Scheffe’s triple system has been used. For the first time, influence of mixture sand-sodium-silicate conglomerates sizes and sodium-silicate-solute content in them on basic indicators of mold and rod mixtures structured in steam-microwave environment has been established, and their composition has been optimized. Data obtained will be useful in molds and rods structured by SMS-process manufacturing. They will have predictable indicators of properties that correspond to their allowable level. Optimal composition of sand-sodium-silicate mixture, structured by SMS-process, is mixture of quartz sand, part of which passed through sieve with cell of 0.315 mm and have sodium silicate solute content (МSiO2=2.8…3.0, 2=1.42…1.44 g/сm3) in amount of 1.5% (by weight, over 100% quartz sand). Keywords.Sand, silicon silicate solute, steam-microwave solidification, optimization, conglomerates, strength, gas permeability, crushability, density, beam deflection, knockout energy.

scholarly journals The Effect of Vulcanization Accelerator on the Properties of Porous Rubber

2021 ◽  
pp. 215-221
Author(s):  
Kymbat S. Zhansakova ◽  
Gregory S. Russkikh ◽  
Evgeny N. Eremin
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Apparent Density ◽  
Molecular Mobility ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Maximum Torque ◽  
Styrene Butadiene ◽  
Vulcanization Accelerator ◽  
Thermo Physical Properties

This work is devoted to identifying the patterns of influence of the vulcanization accelerator N-cyclohexyl-benzothiazyl-sulfenamide (CBS) on the technological, physico-mechanical, and thermo-physical properties of vulcanizates based on styrene-butadiene rubber. It was found that a decrease in the content of the vulcanization accelerator decreases the maximum torque, and a noticeably longer time is required for optimum vulcanization in the absence of CBS. The thermal conductivity in vulcanizates increases with a decrease in the accelerator concentration due to changes in the structure and molecular mobility of kinetic units. Physico-mechanical indicators increase with a decrease in the concentration of CBS, this is due to a decrease in the apparent density of porous rubbers

MEEHANITE GF-20

Alloy Digest ◽  
1973 ◽  
Vol 22 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Cast Iron ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Gray Cast Iron ◽  
Heat Treating ◽  
Gray Cast

Abstract MEEHANITE GF-20 is a gray cast iron designed principally for high machinability and is used where strength is not an important factor. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, heat treating, machining, joining, and surface treatment. Filing Code: CI-39. Producer or source: Meehanite Metal Corporation.

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