SU997953A1 - Core production method - Google Patents

Description

(54) WAY OF MANUFACTURING RODS

The invention relates to a foundry, in particular, to the manufacture of ceramic rods - cast ceramic masses. A known method of making ceramic rods from ceramics with ceramic material, in which the hardened rods in the equipment are heated for 5-60 minutes, in the temperature range of 50-200 ° C, after which they are ignited to remove volatile products of hydrolyzed ethyl silicate C13. The disadvantage of this method is the elimination of the possibility of core shrinkage by impregnation of salts, acids or bases with aqueous solutions, since these aqueous solutions do not penetrate into the core. In addition, the heating of the rods before burning off volatile products leads to increased cracking of the rods. The closest to the invention nq technical essence and. Achieved effect is a method of making ceramic rods, including the molding of rods in a snap, the burning of volatile products, and the roasting of the rod with aqueous solutions of acids, bases, or salts of a PSC plant. The disadvantage of this method is the elimination of the possibility of impregnation of solid rods, since during the burnout process of volatile products of the bonding agent they cannot heat 9 to 300 ° C and the output, i.e. to those temperatures at which the process of impregnation of the rods with aqueous solutions is fully carried out. The aim of the invention is to increase the strength of the rods after procuring due to the intensification of the impregnation of the rods with aqueous solutions of acids, salts, or bases. This goal is achieved by the fact that according to the method of manufacturing rods, mainly up to 0.125 dm from olerizable ceramic mixtures, including pouring the mixture into production equipment, hardening the mixture, burning off easily volatile products, impregnating with water solutions of acids, salts or bases, high temperature. Before calcining with the above-mentioned solutions, the rods are dried at 280–400 ° C. With such a drying, the unburned binder products are removed, the pores are enlarged in the capriceum, and the aqueous solutions freely fill them in the whole volume.

PRI me R. Ceramic mixture containing hydrolyzed ethyl silicate, a refractory filler in the epode of microcorundum electrocorundum and schlefsern electrocorundum d with a ratio of 7: 3, an alkaline hardener, make sample rods 25x25x200 mm in size. After hardening in the equipment, the volatile volatility of these products is burned out. The cooled rods are dried at different temperatures, then impregnated, for example, in an aqueous solution of phosphoric acid

without drying

Not penetrating 270 Not penetrating

5-6 280 350

9-10

9-10 400

From Table 1 it can be seen that for rods dried at a temperature of less than 280 ° C, no penetration of solutions by volume of the rod occurs. It is not necessary to dry the form, since the penetration rate of the solutions is stabilized at 350,400 ° C. With an increase in the viscosity of the processors, it is advisable to increase the drying temperature to the expected

Sample drying temperature, С

Without drying 270 280 350 400

Strength tests of rods treated with a reinforcement. 65

35% constant concentration. In addition to this solution, any aqueous solutions of acids, bases, salts can be used for impregnation, depending on the achievement of the required goals. Table 1 summarizes the effects of the drying temperature on the penetration of an aqueous solution. The drying time depends on the thickness of the rods and can be 0.5-2 hours; the greater the thickness of the rod, the longer it warms up to the required temperature. For these sample rods, the drying time is 0.5 hours. The depth of penetration of the solution is controlled by tinting the methylenism blue.

Table 1

Does not penetrate Does not penetrate Impregnated completely Impregnated completely Impregnated completely

 Drying at the proposed temperature limits also contributes to achieving uniform strength of the rods by volume after calcination, when using heat-impregnated solutions.

In .2 shows the data on the hardening of the ceramic mass after processing, processing rods on the proposed method after calcination at.

Table 2

The bending strength of the processed and calcined samples, kg / cm

9

11 62

70 70

also indicate that the penetration of aqueous solutions into small rods

occurs after drying the rods with and more.

For the impregnation of small rods from ogluable ceramic masses, solutions with organic solvents (alcohol, ajtsToH, etc.) are usually used, which have a low jQpTkoe tension compared to and therefore penetrate well into the microcores of kerashiki and without drying the rods.

 The proposed method allows high-quality impregnation of small rods from gelated ceramic masses with cheaper vodtal solutions instead of using solutions with organic solution gels. The method is recommended for small rods weighing up to 0.2 kg. A: The expected economic effect of using the method under the conditions of the enterprise as compared with the known one will be about 100 rubles per 1 ton of usable.

Claims (2)

1. Authors certificate of the USSR 287241, cl. B 22 C 9/04, 1970. 2.IVBTOpCKoe certificate of the USSR 833365, cl. B 22 C 9/12, 1980.