SU578283A1 - Raw mixture for manufacturing refractory cellular concrete - Google Patents

Description

concretes in a wide temperature range.

Introduction as a pore-forming samytiltriciklosilazana

(SNS) 2

Si /

OT1 NH

1 I

Si Si

 } i

or octamethyltetracyclosilazane (H3C) 2-H1-H-81- (CH3) g

t well

(NzS) g-81- H-81- (CH3) 2

It will be possible to obtain a porous structure under conditions of normal temperature as a result of the reaction of these compounds with solutions of acidic phosphates. The compound with a highly porous structure does not occur in the raw material, irichem does not require high-temperature calcination of the products to remove the organic blowing agent, as is done in the known raw mix.

Example 1. In a mixture consisting of 50 wt. % fine grinding and technical aluminum oxide with a specific surface area of at least 8500, 25 weight. % fine grind at the technical aluminum oxide unification with a specific surface area of at least 10,000, 3 wt. % hexamethyltricylosilazane-a and 22 wt. % phosphoric acid 5. The composition is carefully transferred, the resulting bee mass is placed into molds and heat treated.

Example 2. In a mixture consisting of 20 wt. % to grind cs-modification of technical alumina with a specific surface of at least 8500, 40 weight. % to ground grinding technical alumina with a specific surface area of not less than 10,000, enter 1 weight. % octamethyltetra5 cyclosilazane and 39 weight. % phosphoric acid. The composition is carefully moved. The resulting concrete mass is placed in the form and heat treated. Example 3. In a mixture consisting of

0 3 weight % fine a-grade technical alumina with a specific surface ne less than 8500, 55 weight. % to the ground Y-modification of technical alumina with specific surface not less

10,000, add 0.5 weight. % octamethyltetracyclosilazane and 41.5 wt. % phosphoric acid. All components are thoroughly mixed. The resulting concrete mass is placed in the form and heat treated.

0 In the table. Table 1 shows the known and proposed formulations of concretes, taken in percentages, corresponding to the claims, and in Table. 2 - their comparative characteristics.

Table 1

T a b l II c a 2

Based on the data in the table, the proposed composition in comparison with the known one can significantly increase the strength of heat-resistant cellular concrete and refuse high-temperature firing in the manufacture of light-concrete refractory products.

The proposed composition makes it possible to improve the quality of cellular concrete and its performance properties, increase service life, reduce energy consumption during its production.

Claims (2)

1. USSR Author's Certificate No. 512194, cl. From September 29/02, 1974. 2. Authors certificate of the USSR .Up 308989, cl. From 04:30 to 35/10. 1968.