SU833606A1 - Stone casting material - Google Patents

Description

 (5D) STONE CASTING yield melts need to be heated to higher temperatures. This leads to the complication of technology requires additional costs, which affects the cost of the finished product. The cost of stone casting is also increased by the use of expensive zinc oxide additive. The purpose of the invention is to increase the fluidity and to ensure the possibility of hardening the surface of the layer of casting in the glassy distance. The goal is achieved by the fact that stone casting comprising 5102, Ae20,, Fei, 0, FeO, MhO, CotO, CaF2 contains the indicated components in the following amounts. wt.%: S-iOa. 47.6-53.9 ARaO, 3.2-3.6 Fe20: j 0.7-1.0 Feo 8.5-9.5 MviO 7.4-8.4 Co O 7.6-8, 6 CdFj 15-25 The table shows the composition of the proposed stone cast. Table 1

With an increase in the content of 51О2И AEgO above these limits, the viscosity of the melt increases. The same phenomenon is observed when CaFs are administered. less than 15%. A decrease in the amount of 35 below the limiting values, and the introduction of calcium fluoride by more than 25% causes a decrease in the yield of usable products as a result of obtaining a material of a crystalline friable structure 40 due to an increase in the basicity of the melt.

Improving the casting properties contributes to the introduction of cast iron oxide and manganese. Exceeding the amount of these components above 45 35.5 8.5 12 17 23 30 50 430 54 85 126 210 363 680

4.2 6.9 8.8 12.3 16 21 36

limits also leads to an increase in the basicity of the melt and deterioration of the properties of the obtained castings. A decrease in the content of FeO and MpO below 8.5 and 7.4% leads to a deterioration in the casting and crystallization properties of the melts. Viscosity increases, fluidity decreases and the ability to perform complex casting configurations. At the same time, the amount of free glassy phase in the material increases, which reduces its strength properties. Casting with the optimum content of these components is given in tab (part 2).

Table 2

50

130 software 80

60

60 80 125 100 80 .60 1220 50 40 25

To obtain the material of the proposed composition using the mixture on the basis of acid electric steel slag. 15-25% of fluorspar or technical calcium fluoride is added to 75-85% of slag.

The mixture is melted in electric arc furnaces at 1500-600 s. The melt is poured into sand, metal, ceramic and combined forms, where, at d simultaneous solidification, it crystallizes. The obtained castings are subjected to annealing. The forming material has a uniform structure. The mineral composition is represented by tS calcium fluoride crystals, which serve as the centers of crystallization of the main phase, pyroxene, of a complex composition of augite type.

The proposed melts have a reduced viscosity and a pJ-enhanced flowability (Table 2). The melts of the preformed compositions still have sufficient (40-80 mm) fluidity to fill the mold. As a result of a decrease in viscosity and an increase in fluidity, the temperature of the pouring of the melt during the preparation of the shaped casting is reduced.

Products of the proposed formulations are obtained by filling the molten ceramic, metal, closed forms with a temperature of 1150-1200 ° C, since they have a high (ca 80 mm) fluidity, providing an accurate configuration and relief pattern on the surface of castings.

Such castings are used in construction and local industry as decorative and artistic casting. In addition, in the production of decorative and artistic products, the melts of the proposed compositions have another advantage related to their ability to harden the surface layer in a glassy state. Therefore, the resulting castings have a shiny smooth surface, which significantly improves their marketable appearance.

Claims (2)

1. USSR author's certificate number 423641, cl. C 03 C 3/22, 1972. 2. Lipovskiy I. Ye. I. Dorofeev V., The Foundations of Petrurgia M., Metallurgists, 1972, p. 123-124.