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Filled aluminosiloxane polymer-based coatings thermal stability and heat resistance improvement

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Category: Solid-state physics, mineral processing

Last Updated on 11 July 2014

Published on 11 May 2014

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Authors:

O.I. Peredriy, Cand. Sci. (Tech.), Associate Professor, Lutsk National Technical University, Senior Lecturer of the Department of Commodity Science, Lutsk, Ukraine.

Abstract:

Purpose. Determination of the thermal performance and heat resistance of new protective coatings based on filled aluminosiloxane polymer and installation the influence of the initial composition on the heat resistance and corrosion resistance of the coatings.

Methodology. Provided acting standard methods were used at study. These methods allow studying physical-mechanical characteristic defensive covering. Heat resistance was determined from the change of corrosion penetration under the certain conditions. Corrosion resistance was evaluated from the change of roughness parameters and the area damaged coating. Thermal stability was determined at periodic heating and subsequent cooling in water.

Findings. The positive results of increasing thermal and heat resistance metal surfaces protected from aluminosiloxane coatings have been received. The heat resistance of protective coatings for steel reduces by 20–30% at temperatures exceeding 753 K and if the kaolin introduced into composition, due to its degradation and partial destruction of the inner layers.

The thermal resistance increases by 30–40% when the kaolin fibre is added. The heat resistance of coatings increase by 20 ... 25% if the kaolin and kaolin fibre are introduced into composition.

The corrosion depth of protected metal decreases of 2.2–3.5 times, thereby durability of the material increases 2.5–3.2-fold, respectively. The integrity of the coating decreases monotonically with the increase of temperature due to heat oxidative degradation of aluminosiloxane polymer at temperatures 1123–1473 K (80–88%).

The uniformity of the covering increases by 3–4% if two mass fractions TiO₂ (%) are incorporated in the coating. The continuity increases 5% when kaolin administered in the composition.

Originality. It is set, that to improve the heat resistance of steel structures it is expedient to use appropriate coatings based on filled aluminosiloxane polymer and Al₂O₃, ZrO₂, kaolin, kaolin fibre and modifier TiO₂ are used as fillers. The influence of feed composition on the thermal properties and corrosion resistance of these coatings has been established.

Practical value. Developed heat-resistant protective coating based on filled aluminosiloxane polymer can be used in the steel and mining industries. The purposeful control performance property of coatings is possible in a wide temperature range because the influence of oxide and silicate fillers comprising coatings has been established.

References:

1. Мережко Н.В. Властивості та структура наповнених кремнійорганічних покриттів : монографія / Мережко Н.В. – К.: Київ. держ. торг.-екон. ун-т., 2000. – 257 с.

Merezhko, N.V. (2000), Vlastyvosti ta struktura napovnenukh kremniiorganichnykh pokrutiv [Properties and Sructure of Filled Silicone Coatings], KNCEU, Kiev, Ukraine.

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Brok, T. (2007), Evropeyskoe rukovdstvo po lakokrasochnym materialam i pokrytiam [European Guidance for Paints and Paint Coatings], Stroiizdat, Moscow, Russia.

3. Ємченко І.В. Композиційні захисні покриття / І.В. Ємченко // Вісник ЛКА (серія товарознавча). – 2004. – Вип. 6. –
С. 158–163.

Yemchenko, I.V. (2004), “Composite protective coatings”, Visnyk LKA, no.6, pp. 158–163.

4. Передрій О.І. Дослідження фізичних властивостей наповнених силіційорганічних покриттів / О.І. Передрій // Вісник Хмельницького національного університету. – 2010. – № 5. – C. 44–48.

Peredriy, O.I. (2010), “The study of the physical properties of filled surfaces based on full silicate”, Visnyk Khmelnytskogo Natsionalnogo Tekhnichnogo Universitetu, no. 5, pp. 44–48.

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