A study of the corrosion resistance of refractory concretes to a melt of borosilicate glass under dynamic conditions

Abstract

Studies of the corrosion resistance of samples of low-cement concrete of differing compositions to a melt of borosilicate glass under dynamic conditions at 1350EC are performed. Laws governing the variation in the degree of corrosion as a function of the chemical and phase composition of refractory concretes are discovered.Keywords: low-cement concrete, borosilicate glass, degree of corrosion degree of impregnation, dynamic testing conditionsThe quality of refractory materials that are in direct contact with working media in the glass making furnace, i.e., situated in the glass boiling zone (crown, walls, floor of boiling area, etc.) is of great importance for ensuring that the glass product will be of high quality. In addition to refractory material located in the boiling zone, the quality of the glass is greatly affected by articles that are situated in the manufacturing section (elements of the feeders, glass-molding machines), which is of a complex configuration and which, depending on their purpose, are subject to stringent constraints in terms of both operating characteristics and in terms of form and dimension. In the course of use these refractory components are subjected to the intensive action of glass melts and experience significant thermal and mechanical stresses, and therefore must possess high glass resistance and thermal stability and strength and must also maintain constant specified glass melt feed parameters and temperature homogeneity of the melt [1].A number of requirements are imposed on the refractory materials used in glass making furnaces, the most important of which is corrosion resistance to the glass melt (glass resistance [2 -4]. It has been noted previously [5] that a contact layer characterized by substantially higher viscosity by comparison with the viscosity of the glass melt is formed in the interaction of refractory materials with a glass melt. A dynamic method of testing for corrosion resistance is therefore used. The method is based on rotation of a sample of refractory material in the glass melt at a specified rate, as a result of which a physical simulation of the nature of the action of the glass on the refractory material under industrial conditions is achieved.Tests of samples of low-cement refractory concrete produced by the OAO Semiluk Refractory Plant under dynamic conditions were carried out by the Department of Technology and Design of Ceramics and Refractory Materials, Shukhov State Technological University of Belgograd. Beginning in 2003 the enterprise has also marketed these types of concrete in the refractory materials market for the glass industry [6]. Tests were performed on samples measuring 20´20´250 mm in a melt of borosilicate glass from the firm of OAO Tver'steklo and ZAO Borosovsk Glass. The samples were tested at 1350°C with the use of a special high-temperature plant according to the technique described in [5].Diagrams that display the degree of corrosion of the samples and the depth to which the glass melt penetrated samples of refractory concrete of d...

Luminescence Properties of Samarium Ion‐Doped Silicoborate Glasses for Application in Optoelectronic Material

“…They show low thermal expansion coefficient (%50 Â 10 À7 °C), less thermal stress, and high corrosion resistance. [14][15][16][17] Other important aspects of glasses are their network modifiers and intermediates. Not only these aspects do involve in building the glass network but also it facilitates to reduce the melting temperature, thereby modifying their properties.…”