Use of Differential Thermal Analysis and Dilatometric Measurements for Study of Phase-Separation Phenomena in Glasses

Usvitskii, M. B.

doi:10.1007/978-1-4757-0157-9_25

Phase-Separation Phenomena in Glasses / Likvatsionnye Yavleniya v Steklakh / Ликвационные Явления В Стеклах 1973

DOI: 10.1007/978-1-4757-0157-9_25

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Use of Differential Thermal Analysis and Dilatometric Measurements for Study of Phase-Separation Phenomena in Glasses

M. B. Usvitskii¹

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2006

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“…Differential-thermal analysis of the glasses indicated the presence of two endothermic effects extended in the temperature interval of 600 -730°C, whose presence is typical of liquating glasses. The inflections visible in the DTA curves are related to two temperatures, i.e., vitrification and softening, which indicates the presence of two vitreous phases [4]. Crystallization is indicated by the exothermic effects at temperatures of 815 -980°C observed in most compositions.…”

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Phase composition and structure of dull low-melting glazes

Moreva¹,

Levitskii²

2006

Glass Ceram

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The possibility of producing dull low-melting glazes for ceramic products to be fired according to a slow firing regime based on the system Na 2 O -MgO -CaO -B 2 O 3 -Al 2 O 3 -SiO 2 is demonstrated. The results of studying glaze glasses and coatings by x-ray phase analysis, electron microscopy, infrared microscopy, etc. are described. A correlation between the structure and the phase composition of coatings and their qualitative characteristics is established. The main properties of synthesized dull glazes are specified.Household majolica and pottery are becoming increasingly popular. Producers appreciate the possibility of using inexpensive local argillaceous materials, whereas consumers appreciate high artistic qualities reviving the traditions of folk crafts. Dull glazes used for decorating majolica products impart diverse types of textures to the majolica surface and conceal the heterogeneity in color tones that is typical of majolica. Furthermore, a glaze coating can improve the service properties of an article and decrease its disadvantages, such as high porosity, high water permeability, and low mechanical strength.One of the best methods for obtaining a dull glaze surface is based on inducing a crystalline phase in the coating, whose refractive index differs significantly from that of the matrix glass. The dullness of such coating is determined by the diffuse reflection of light from the faces of the emerging crystals, and the degree of dullness depends mainly on the size and quantity of crystals.The development of glazes not containing expensive or toxic components is of special interest. The research in the synthesis of opaque zirconium-free glazes performed at the NIIstroikeramika Institute [1] and at the Kharkov State Polytechnic University [2], as well as our studies [3], indicate that glaze coatings with a dull texture can be obtained in the system R 2 O -RO -B 2 O 3 -Al 2 O 3 -SiO 2 [R 2 O) Na 2 O, K 2 O; RO) MgO, CaO] due to the formation of opacifying phases represented by wollastonite and diopside under optimum temperatures. According to the authors of [1, 3], a silky-dull coating surface can be ensured by the formation of a finely dispersed structure with crystal sizes not more than 10 mm. However, the known compositions are intended for construction ceramics whose technology involves fast firing.The purpose of the present study is to obtain dull glazes based on the system Na 2 O -MgO -CaO -B 2 O 3 -Al 2 O 3 -SiO 2 by a slow-firing regime, which would be formed due to the crystallization processes.For our study we selected a range of compositions containing a constant quantity of Na 2 O and Al 2 O 3 equal to 10 and 3%, respectively (here and elsewhere mol.%, unless otherwise specified). The following contents of the components were studied (%): 0 -10.0 MgO, 2.5 -22.5 CaO, 4.5 -19.5 B 2 O 3 , and 50.0 -65.0 SiO 2 .Experimental glaze glasses were obtained by melting batches whose components included quartz sand, boric acid, soda ash, chalk, dolomite, alumina, and magnesia. Synthesis was performe...

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confidence: 98%

Phase composition and structure of dull low-melting glazes

Moreva¹,

Levitskii²

2006

Glass Ceram

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Use of Differential Thermal Analysis and Dilatometric Measurements for Study of Phase-Separation Phenomena in Glasses

Cited by 1 publication

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Phase composition and structure of dull low-melting glazes

Phase composition and structure of dull low-melting glazes

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