SU1590470A1 - Composition for producing heat-insulating coating - Google Patents

Abstract

The invention relates to masses for the manufacture of thermal insulation coatings. The purpose of the invention is to reduce the bulk density and improve the thermal insulation properties while maintaining high strength. Mass contains, wt%: sintered periclase 55-65

chromite 20-30

foam-coke breeze with a specific surface area of 2000-3000 cm 2 / g 6-8

a blowing agent from gypsum powder with a specific surface area of 2000-3000 cm 2 / g 1-2 and a binder 5-8. After firing at 1550 ° C, the bulk density was 1.27-1.34 g / cm 3, thermal conductivity 1.12-1.16 W / mK, compressive strength 9.2-10.6 N / mm 2. 2 tab.

Description

The invention relates to masses for the manufacture of heat insulating coatings on the lining of a metal casting device.

The purpose of the invention is to reduce the volumetric mass and improve the thermal insulation properties while maintaining high strength.

The preparation of the heat insulating mass is carried out by mixing sintered magnesite, chromite, pekokske coke breeze and gypsum powder in a paddle batch mixer. Periclase and chromite are loaded, mixed for 3-4 minutes, then peck-coke breeze and gypsum are added and mixed for another 4-5 minutes. The total mixing time is at least 8-9 minutes. Introduction

the binder in a mixture of an aqueous solution of liquid glass with a density of 1.15-1.17 g / cm is carried out during shotcrete at the exit of the gun nozzle, i.e. directly during coating.

Specific mass compositions are given in Table. 1, and their properties - in table.2.

Table 1

ate

with about

four

31590470

Continued table. one -

... to

Continued table. one

Components

The content of components wt;% in the composition

FUR e-11

costly

2

5 6

60 25

7.5

55 30

65 20

Bulk mass after calcination at 1550 C, g / cm3 Thermal conductivity after calcination at 1550 C, W / cm-K) Strength limit - during compression after calcination at f550 c, N / mm2

As can be seen from Table 2., the proposed mass is characterized by better thermal insulation properties, lower bulk density, lower thermal conductivity and provides sufficiently durable coatings that prevents the possibility of contamination of the metal with additional non-metallic inclusions, forming in the event of destruction of the coatings.

Claims (1)

Formula  A mass for the manufacture of a heat insulating coating, including sintered periclase, chromite, a burnable carbonaceous additive and a binder, characterized in that. The content of components, wt.%, In the composition Known - 1 1 I 2 I 3 Gas generator from. gypsum powder with a specific surface of 2000–3000 Aqueous solution of liquid glass with a density of 1.15–1.17 g / cm 1.5 t a b l and c a 2 1.27 1.34 1.28 1.12 1.16 1.13 9.7. 10.6 9.2 With the aim of reducing the bulk density and improving the thermal insulation properties while maintaining high strength, it contains as a burnable carbon-containing additive pecocox fines with a specific surface area of 2000–3000 and, additionally, a gas generator made of gypsum powder, with a specific surface area of 2000–3000 with the following ratio of components , wt.%: five Sintered periclase Chromite Pekokoksova trifle with a specific surface 2000-3000 Binder 55-65 20-30 6-8 5-8 Gypsum powder blowing agent with 2000-3000 narrow surface 1-2