SU482425A1 - Fireproof mass - Google Patents

Description

one

The invention is intended for use as refractory Tokens, high-temperature thermal protective coatings and glue for bonding ceramic and metallic materials, as well as for the manufacture of high-refractory products.

Known refractory masses contain refractory filler and various, including phosphate, binders. However, they do not have sufficient adhesion and stability under the conditions of high temperatures, plasma flows and sharp thermal shocks with temperature changes.

The purpose of the invention is to obtain high-strength refractory materials, coatings and adhesives with high adhesion to both metallic and non-metallic materials.

This is achieved in that the refractory mass contains 45-70 wt. % periclase-nlpinel eutectic (fraction less than 5 mm), 5-25 weight. % powdered refractory metal, such as nickel or chromium (fraction less than 10 mm) and 5-50 weight. % aqueous solution of monosodium phosphate aluminum density of 1650 kg / m Pre-synthesized periclase-spinel eutectic mixtures can contain 25-75 wt. % periclase and 25-75 weight. % spinel.

The highest adhesion properties are observed for masses that contain refractory aggregate and metal in a ratio of from 6: 1 to 4: 1. The oxidation of metals and the interaction with MgO leads to the formation of solid solutions and spinels, which is accompanied by an increase in the volume and compensation of shrinkage effects that occur during various heat treatments and sintering, and provides high strength properties of materials.

To ensure high strength properties of products, concrete, coatings and glued compositions, heat treatment is carried out by drying in air at temperatures

up to 250 ° C. Temperature rise from room temperature to 250 ° С should not exceed 1 ° С per minute. The higher the temperature of heat treatment or sintering, the higher the strength properties of the material or product

based on the proposed refractory mass. In tab. G shows some compositions of refractory masses, in table. 2 - strength properties of materials based on them after drying at 250 ° C for 1 hour.

After firing at 1500 ° C, adhesion strength exceeds 130-10 n / m for all compositions of refractory masses. The coefficient of thermal linear expansion in the range of 20-1500 ° C is (11-14) -10 degrees. After heat treatments above 250 ° C, the material is based on

Table I

table 2

The proposed refractory mass acquires high water resistance, heat resistance and resistance to high-temperature gas flows at temperatures up to 1990 ° C on the working side of the refractory.

Subject invention

Claims (2)

1. Refractory mass, including a refractory filler and aluminophosphate binder, characterized in that, in order to improve water resistance, temperature resistance and strength, it contains as a refractory filler periclase spinel eutectic to the metal from the group: nickel, chromium - with the following ratio of components, weight. %: Periclase-clamping eutectic fractions less than 5 mm45-70 Metal fractions less than 10 microns5-25 Binder - water monosodium phosphate solution density of 1650 kg / m 5-50 2. A mass according to claim 1, characterized in that the periclase-chipping eutectic contains, weight. %: Perclase25-75 Spinel25-75