SU1551697A1 - Charge for manufacturing refractory articles - Google Patents

Abstract

The invention relates to the production of refractories and can be used in high-temperature thermal units. The purpose of the invention is to reduce the firing temperature and increase the mechanical strength. The mixture for the manufacture of refractory products contains, wt%: silicon carbide 27.5-32.5, magnesium oxide 7.5-12.5, aluminum titanate the rest. Annealing temperature of 1180-1200 ° C, compressive strength of 250 MPa. 2 tab.

Description

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(21) 30272 / 31-33

(22) 26.U5.88

(6) 03/23/90. Bul R 11 (70 S.K. Kirov Belarusian Technological Institute (72) J1.M. Silich, AA Stepanchuk, S.A. Gaylevich and NI Lipnitska (53) 666.972 (088.8) (5 & ) USSR Author's Certificate No. 12783 1, “L. C V. 35L6, 1986.

USSR Author's Certificate No. Yu31952, cl. From 04 To 35 / U, 1983.

() CHARGE FOR PRODUCTION OF REFRACTORY PRODUCTS

(57) The invention relates to the production of refractories and can be used in high-temperature thermal units. The purpose of the invention is to reduce the firing temperature and increase the mechanical strength. The mixture for the manufacture of refractory products contains, in wt.%: Silicon carbide 27.5-32.5 magnesium oxide, magnesium oxide, 5, aluminum titanate the rest. Annealing temperature 1180-1200 C, compressive strength 250 MIA. 2 tab.

The invention relates to the production of refractories and can be used for the manufacture of refractory products used in high-temperature thermal units.

The purpose of the invention is to reduce the firing temperature and increase the mechanical strength.

The mixture for the manufacture of refractory products is prepared as follows.

Aluminum titanate is pre-synthesized from oxides A1203 and TiO2, taken in equimolar ratio, at 16 (JU ° C for 2 h.

Synthesized aluminum titanate, silicon carbide and magnesia are crushed and sulphide-alcohol barda (PRS) is mixed with moistening. The products are molded using the semi-dry pressing and roasting at 1180-1200 ° C for 1 m.

The composition of the mixture are given in table. 1 (compositions k and 5 with extreme values).

The properties of the proposed mixture for the manufacture of refractory products and the properties of the known are given in table. 2

As can be seen from the table, the proposed composition has high physico-chemical and thermal properties. The firing temperature is 70-904 lower compared to the prototype. The compressive strength of the material proposed is 60-87% higher than that known, which seems to be lower in 1, times, thermal expansion coefficient is lower by (9-th) 1 (G7, which determines a higher heat resistance by more than 15 cycles.)

The mixture for the manufacture of refractory products, including aluminum titanate, silicon carbide and magnesium oxide, characterized in that

(L

: l cd

5 with J

in order to reduce the firing temperature and increase the mechanical strength, it contains these components in the following ratio, wt.%:

Silicon Carbide Magnesium Tytanate Aluminum Oxide

Table 1

Claims (1)

The formula of the invention The mixture for the manufacture of refractory products, including aluminum titanate, silicon carbide and magnesium oxide ^: characterized in that, in order to reduce the firing temperature and increase mechanical strength, it contains these components in the following ratio, wt.%: Silicon Carbide Magnesium Oxide Aluminum Titanate 27.5-32.5 7.5-12.5 Rest Table 1 Components - Content, wt.%, In the composition 1 2 3 1 ------------------------ 1 eleven 1 -fc- 1 eleven eleven eleven eleven 5 Famous Aluminum Titanate Silicon Carbide Magnesium Oxide AljOj 65 60 55 70 fifty 27.5 thirty 32,5 25 ¹ 35 7.5 10 12.5 5 fifteen • - Table 2 Properties Indicators for composition ¹ 1 ² 1 ³ .l · ....... l · ..... | Famous Firing temperature, ”C 1180-1200 1180-1200 1180-1200 1270-1300 12 / 0-1300 Heat resistance (800 ° С - air) cycles > 45 > 45 > 45 > 45 35 TKLR, o (* "1 O ⁷ deg 25 27 31 thirty 42 Compressive strength, MPa 250 250 240 150 140 The apparent porosity,% 9,4 9.8 10,2 14.5 19.2 1270 150 15-19