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Archiv2014-4-5



REFRACTORIES AND TECHNICAL CERAMICS №4-5 2014

SCIENTIFIC RESEARCH

Kand. tehn. S.N Perevislov *, PhD. tehn. D.D Nesmelov **

* JSC "Central Research Institute for Materials"

** St. Petersburg State Technological Institute (Technical University), St. Petersburg, Russia

UDC 666.31 Liquid-Phase silicon carbide sintering, structure, mechanical properties

A review of the literature over the past 10 years by a liquid phase sintered silicon carbide materials with different activating sintering additives. The microstructure and the laws of its formation. The dependence of the coefficient of fracture toughness, strength and hardness of the material from its structure. Keywords: silicon carbide, liquid-phase sintering, adjuvants factor crack resistance, strength, hardness.

 

S.Y Prilipko, AA Novohatskaya, Y.F Revenko, PhD. Sci. G.Y Akimov, PhD. Sci. V.V Burhovetsky

Donetsk Physical-Technical Institute of Ukraine,. Donetsk, Ukraine

UDC 666.7 FORMATION of structure and properties during sintering NANOPOWDERS MANGANATES (La0,65Sr0,35) 0,8Mn1,2O3 ± D AND La0,7Mn1,3O3 ± D

In the manganite sintered ceramic nanopowders of various sizes (from 6 to 200 nm) obtained samples with different degree of disorder in the area of ​​grain boundaries. The dependence of the resistivity of the magnetoresistive and dynamic magnetic susceptibility of the original size powders. Based on the analysis of density and resistivity of samples concluded that significant effects impurity beans ceramics. Keywords: lanthanum manganite ceramics, size effect, colossal magnetoresistance, electrical resistance, sintering.

 

Dr. Sci. S.A Suvorov, M.N Zastrozhnov

St. Petersburg State Technological Institute (Technical University), St. Petersburg, Russia

UDC 666.6OPTIMIZATSIYA CONCRETE based on the composition of corundum and silicon carbide

Optimization of concrete simplex method has improved the mechanical compressive strength from 110 to 135 MPa; lower open porosity of the samples, after drying at 125 ° C and 9.8% after sintering at 1400 ° C - 11%, to improve the fluidity of concrete in a mixing a water content of 3.8%. Deformation under load in an oxidizing environment at T = 1590 ° C is not detected. Concrete has high heat resistance - more than 30 thermal cycles on the treatment of 1000 ° C - water. Microstructure this concrete as well as concrete and microstructure of silicon carbide is resistant to extreme temperatures - after 30 thermal cycles compressive strength of the samples and the open porosity is not changing. The values ​​of the physical and technical characteristics are virtually identical to before test. Keywords: cementless concrete, silicon carbide, fused alumina, porosity, mechanical strength, heat resistance, chemical resistance.

 

Y. Pimco, PhD chem. Sciences N.V Filatov, Dr. Sc. N.F Kosenko, R.M. Bezrukov

VPO "Ivanovo State University of Chemistry and Technology", Ivanovo, Russia

UDC 666.762.14: 544,463: 543.4: 543.57 PHYSICS-CHEMICAL ANALYSIS OF mehanoaktivirovannyh mullitization

The results of the complex physico-chemical studies of the formation of mullite based mechanochemically activated aluminosilicate compounds and silicon-containing components. Analyzed the effectiveness of different types of machining pre-mixtures and subsequent firing, leading to the formation of mullite phase. Keywords: mullite mullitization, mechanical activation, high-temperature synthesis.

 

G.N Safronov, Dr. Sc. Sciences N.N Safronov, Ph. tehn. L.R Sciences Kharisov

Naberezhnye Chelny Institute (branch) of Kazan (Volga) Federal University, Naberezhnye Chelny, Russia

UDC 666.6 MODEL of  TECHNOLOGICAL properties of the refractory moldable mixture

The results of studies of the properties of refractory molding compounds on the link received in the process of recycling waste dispersed engineering enterprises by SHS. The mathematical model of dependence of the properties of the input-controlled factors. The analysis of the significance of the regression coefficients of the objective function, identifying the most significant input parameters. Keywords: molding sand, cement binder, slag, aluminous cement, strength, scale, chips, SHS process.

 

AA Hort, PhD. tehn. EM Sciences Dyatlov, AL Nikolskaya

Educational establishment "Belarusian State Technological University" (Belarusian State Technological University), Minsk, Republic of Belarus

UDC 666.7 INVESTIGATION of  ceramic ferroelectric materials BASED BaTi1-xFexO3

The synthesis and study of ferroelectric ceramic materials on the basis of BaTi1-xFexO3. It has been found that the introduction of the Fe3 + ions leads to an increase in the degree of tetragonal perovskite barium titanate crystal lattice, enhances the true density of material, and also leads to the appearance of abnormally high values ​​of dielectric constant. It also emerged that there is a saturation point BaTiO3 crystal lattice of Fe3 + ions in the values ​​of x> 0,08. Keywords: synthesis, grille, BaTiO3

 

Dr. Sc. U.Sh. Shayakhmetov, PhD. tehn. A.R  Murzakova

Bashkir State University, Ufa, Russia

UDC 666,777: 620.173.25 Produce of  the carbon-ceramic composite refractories

The article describes the technology of carbon-ceramic composite materials inorganic. Keywords: carbon-ceramic materials, composite materials, Tauren, carbon black.

 

Dr. Sc. LG Sciences Znamensky, PhD. tehn. Science AS Varlamov

Federal State Educational Institution of Higher Professional Education "South Ural State University" (National Research University), Chelyabinsk, Russia

UDC 621.74.045  LOW-TEMPERATURE synthesis mullite ceramic of the sol-gel process electropulse IN ACTION ON colloids

The article is devoted to improve the properties of technical ceramics in foundry processes. It has been established that the increase of the thermal strength of ceramic forms can be attained by performing the hydrolysis EFV aqueous solutions of aluminum salts (AlCl3 • 6H2O and Al (NO3) 3 • 9N2O) when exposed NEMI. Said electric pulse treatment ensures dispersion of colloidal particles and leads GRETS upon subsequent heating ETS binder with aluminum salts to accelerate the solid state reaction between SiO2 and Al2O3 colloid and reducing the temperature mullitoobrazovaniya. By IR spectroscopy, and X-ray analysis derivatografic found that the crystallization temperature of mullite in the gels obtained in this manner is lowered to 850-900 ° C. In investment casting, these values ​​correspond to the temperature ceramic baking forms. Therefore, in their phase composition appears mullite providing thermal linear expansion factor reduction, improved accuracy and thermal strength in forming. Based on these studies established generalize regularities structuring ceramics under low-temperature synthesis of mullite with nanosecond electromagnetic impuls. Keywords: ceramic molds, investment casting, ethyl silicate binder, a low-temperature synthesis of mullite, the hydrolysis of aluminum salts, heat-resistant nickel alloy, electromagnetic nanosecond pulses.

 

Refractories for glass industry

 

Dr. Sc. Sciences V.Y Dzyuzer

Ural Federal University. First Russian President B.N Yeltsin, Yekaterinburg, Russia

UDC 66.041 ENERGY LINING forehearth glass forming machine

The requirements to the thermal homogeneity of the glass in front of elaboration. The results of the calculation of the geometric parameters of the feeder channel. Developed energy-efficient thermal insulation structure of the bath channel, providing almost two-fold reduction of heat loss to the environment and the formation of a relatively uniform temperature field in the cross section of flow of the glass in channal. Keywords: glass furnace, the feeder channel, the structure of masonry, thermal insulation, heat transfer parameters.

 

PRODUCTION

 

PhD. tehn. Sciences A.A Sandulyak, PhD. tehn. Sciences V.A Yershov, Dr. Sc. A.V Sandulyak, PhD. tehn. Sciences SF Mirsaitov, D.A. Sandulyak, E.P Kurenkov

Moscow State Construction University, Moscow, Russia

Moscow State Engineering University, Moscow, Russia

Moscow State University of Instrument Engineering and Computer Science, Moscow, Russia

UDC 666.7 HIGH ACCURACY MAGNIT-CONTROL FERROMIX (as alternative raw materials) in conditions of forced suspending SAMPLE

Test method implemented operationally extrapolated  originally intended to suspend the sample to be analyzed, operating (sectional) recovering (including ferroparticles  and subsequent magnetic separation. It was found that the implementation of this method it is necessary to carry out additional methods of enrichment (enrichment) of rain to produce reliable (to objective monitoring) concentrate. Keywords: magnetic separation, enrichment and re-enrichment.

 

International Review

 

H. Manar A. Kumar

Padmaja Inc., Totale Refractories Division, Chennai, India

NEW GENERATION insulating concrete average density FOR A hot cyclone boilers burning fuel in circulating fluidized bed

The article presents the results of the creation of insulating concrete average density based on the system CaO-Al2O3-SiO2 to form double bonds (3Al2O3 • 2SiO2) Referring generally in the high-alumina cement phase insulating concrete begins to react with the other components at a temperature of 1100-1500 ° C, which It is the temperature at which they operate. In this regard, it is important to ensure high durability concretes in that said range of operating temperature. In recent shortage of electric power is a limiting factor in the growth of many economies. This article introduces the concept of the creation of insulating concrete medium density, and compares its properties with existing analogues. The article also discusses the features of the practical application of the created material and high efficiency of its use in cyclone boilers hot combustion circulating fluidized pie. Keywords: concrete, cement, insulation

 

Zimmat R., K. Dannert, P. Kvirmbah

Association for Research of refractory materials, Bonn, Germany

German Institute of refractory materials and ceramics, Bonn, Germany

COMBINED OVENS TESTING refractories for aluminum smelting by the corrosion and erosion resistance

Currently refractories used for lining furnaces secondary aluminum melting are subjected to degradation by the corrosive molten aluminum as well as high mechanical stress. The article describes the method of combined testing of refractories for the account of the joint action of the factors influencing the wear of refractories, in order to more accurately simulate operating conditions in laboratory tests. The proposed test methods allow us to investigate the interaction between corrosion and mechanical wear at different temperatures. The authors have developed two types of tests. In the first experiment refractories exposed to the combined effects of erosion and corrosion loads. In the second experiment, samples of cylindrical shape were tested under the combined effect of corrosion and thermal shock in a modified induction furnace. Tests were conducted at a temperature of 850 ° C. Performing both experiments allows more accurate assessment of the performance of refractories production Keywords: refractory secondary, aluminum corrosion.

 

D. Shmidtmayer, R. Lorenz Kokegi

Almatis GmbH, Lyudvighafen, Germany

NEW refractory concrete with synthetic placeholder

The article presents the refractory concrete compositions based on synthetic alyuminatnokaltsievyh aggregates (CA6) SLA-92 (light) and Bonite (tight). Fillers may be used either individually or in combination. Test results for strength and thermal conductivity. Concretes have low thermal conductivity, density and strength can vary widely. The creation of such concretes with special properties for specific production by combining materials SLA-92 and in one part of Bonite can let go of the multilayered lining to one pie. Keywords: concrete, alyuminatnokaltsievy properties.

 

A. Luz V. Pandolfelli

Federal University of Sao Carlos, Brazil

Research Institute of Materials Science and Technology, Mar de Plata, Argentina

Thermodynamic analysis of chemical corrosion of refractory concrete OF AL2O3-MgO

The results of thermodynamic calculations of chemical corrosion two refractory concretes of AL2O3-MgO (as a binder containing alumina and hydrating cement). In addition, a critical analysis is made of three design models that take into account: 1) the interaction of slag-concrete as a function of the reaction rate A; 2) changes in the composition of the slag as a result of its reaction with the components of concrete considering the direct contact between the liquid and all components of the concrete; 3) reacting slag and slag matrix filler were evaluated separately. The calculation results are compared with data on the corrosion test (cup tests). Although the thermodynamic calculations of concrete as a whole enabled the correct identification of phase transformations, it is recommended to perform a two-step analysis of the interaction of the liquid matrix and filler for the prediction of different corrosion resistance of these two concrets. Keywords: corrosion, concrete system AL2O3-MgO.

 

RAW MATERIALS

 

Dr. chem. Z.R Kadyrova, BC PIRMATOV * A.A Eminem, V.A Bugaenko ** PhD. tehn. H.L Usmanov

Institute of General and Inorganic Chemistry of the Academy of Sciences of Uzbekistan, Tashkent, Uzbekistan

* OAO "Uzmetkombinat"

** JV "Bekabad-refractory"

UDC. 666.76.1.3.14 INFLUNCE OF  TEMPERATURE FOR PHYSICAL AND FIRING thermomechanical properties of refractory materials

The results of studies of the effect of the firing temperature on the physicochemical and thermomechanical properties of mullite refractories. It was found that the performance of prototypes at a burning temperature 1600 ° C are in normalized limits. Keywords: firing temperature, physico-chemical, thermomechanical, mullite, refractories, mullite bunch, kaolin AKF-78, spent catalyst, fireclay, charge, strength , porosity and density.

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