PLASMOCHEMICAL MODIFICATION OF WALL BUILDING MATERIALS

the aim of the work is to study the effect of a high-temperature plasma torch on the processes of phase transformations and layer-by-layer modification of the protective and decorative coating on concrete using as a filler a mixture of quartz sand and hollow glass microspheres. The main tasks included: investigation of the processes of evaporation and thermal diffusion of oxides of plasma-coated coatings; study of phase transformations in the melt and its subsequent crystallization in the process of rapid spontaneous cooling of the fused protective and decorative coating; study of the effect of sodium liquid glass on the processes of polymorphic transformations of alumina and the formation of micro-wicks due to the intense diffusion of sodium oxide; study of operational characteristics of protective and decorative coatings. It was established that the initial phases in the protective-decorative coating are α-Al2O3 and CaO∙6Al2O3 (β-Al2O3), and the liquid sodium glass in the coating leads additionally to the formation of Na2O∙11Al2O3. The top layer of the protective and decorative coating is Na–Ca–Al–Si glass with regions of heterogeneities containing an increased content of sodium oxide. The content of aluminum oxide in the protective and decorative coating based on the battle of high-alumina refractory was 95.1 %. The introduction into the coating composition of sodium liquid glass minimizes the processes of dehydration of the binding component and changes the chemical composition of the protective and decorative coating. Reduction of the aluminum oxide content to 83.0 % affects the microhardness indicators. Microhardness of the concrete surface due to the introduction of liquid glass is reduced from 2510 HV to 887 HV.

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ChemInform Abstract: CRYSTALLIZATION AND METASTABLE PHASE TRANSFORMATIONS OF ZEOLITE ZSM-5 IN THE (TPA)2O-SODIUM OXIDE-POTASSIUM OXIDE-ALUMINUM OXIDE-SILICON DIOXIDE-WATER SYSTEM

Chemischer Informationsdienst ◽

10.1002/chin.198010015 ◽

1980 ◽

Vol 11 (10) ◽

Author(s):

A. ERDEM ◽

L. B. SAND

Keyword(s):

Aluminum Oxide ◽

Silicon Dioxide ◽

Phase Transformations ◽

Metastable Phase ◽

Water System ◽

Sodium Oxide ◽

Potassium Oxide

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MODIFIED COBALT CATALYSTS FOR HYDROGENATION OF HYDROCARBONS

ГОРЕНИЕ И ПЛАЗМОХИМИЯ ◽

10.18321/cpc364 ◽

2020 ◽

Vol 18 (3) ◽

pp. 156-161

Author(s):

A.N. Aitugan ◽

S.K. Tanirbergenova ◽

Ye. Tileuberdi ◽

D. Tugelbayeva

Keyword(s):

Catalytic Activity ◽

Aluminum Oxide ◽

Process Parameters ◽

Cobalt Catalyst ◽

Cobalt Catalysts ◽

Oxide Content ◽

Acetylene Hydrogenation ◽

Aluminum Oxides ◽

Selective Hydrogenation Of Acetylene ◽

Chemical Contents

This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated. The catalytic activity of 5 % Со /clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 , with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8 % in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1.5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со /clay 450 ℃ catalyst.

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ChemInform Abstract: THE SODIUM FLUORIDE-ALUMINUM FLUORIDE-ALUMINA-SODIUM OXIDE SYSTEM. I. STANDARD FREE ENERGY OF FORMATION OF α-ALUMINUM OXIDE FROM EMF. MEASUREMENTS

Chemischer Informationsdienst ◽

10.1002/chin.197644013 ◽

1976 ◽

Vol 7 (44) ◽

pp. no-no

Author(s):

A. STERTEN ◽

S. HAUGEN ◽

K. HAMBERG

Keyword(s):

Free Energy ◽

Aluminum Oxide ◽

Sodium Fluoride ◽

Standard Free Energy ◽

Oxide System ◽

Sodium Oxide ◽

Aluminum Fluoride ◽

Emf Measurements ◽

Free Energy Of Formation ◽

Energy Of Formation

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Chipboards with Plasma Protective Decorative Coatings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.974.90 ◽

2019 ◽

Vol 974 ◽

pp. 90-95 ◽

Cited By ~ 1

Author(s):

Nadezhda I. Bondarenko ◽

Sergey A. Chuev ◽

Ludmila A. Dogaeva ◽

Tatiana A. Jalovencko

Keyword(s):

Chemical Modification ◽

Sheet Glass ◽

Intermediate Layer ◽

Liquid Glass ◽

Front Surface ◽

Electric Arc ◽

Alkali Resistance ◽

Arc Plasma ◽

Plasma Chemical ◽

Decorative Coating

A plasma technology has been developed for the production of chipboard with vitreous protective decorative coatings. To prevent high temperatures of the plasma jet from being applied to the front surface of the chipboard, an intermediate layer was applied, which included a mixture of sodium liquid glass with colored glass powders based on profiled and sheet cullet. The technology of a two-stage deposition of an intermediate layer before plasma spraying of the main vitreous coating has been developed. The technology provides for the preliminary front surface preparation and the liquid glass application on a wood chipboard, the intermediate layer application and subsequent drying at 95 °C. The adhesion strength of the intermediate layer with the matrix was 1.6–1.8 MPa. The optimal technological parameters of plasma-chemical modification of a protective decorative coating based on fine powders of sheet and profiled glasses have been established: the power of an electric arc plasma installation operation is 8 kW, the flow rate of argon plasma gas - 2.0 m3 /hour. It is shown that the water resistance of protective decorative coatings based on profiled and sheet glass is III hydrolytic class. Vitreous coatings had high reliability and durability, in particular, acid resistance, alkali resistance and microhardness. Due to the electric arc plasma installations use for plasma-chemical modification of protective decorative coatings based on profiled and sheet glass cullet, the technology is resource and energy efficient, and is also recommended for introduction both in furniture industry and in the construction industry.

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