SU768532A1 - Fire-resistant paint for steel reinforcement - Google Patents

Description

(54) Refractory Ink The invention relates to foundry, in particular, refractory paints for steel fittings and steel parts cast iron. In practice, in a number of cases, it is necessary to obtain cast iron castings reinforced with an internal steel frame, for example, brake pads and other castings from highly phosphorous cast iron. When applied to steel reinforcement, the paint should provide strong adhesion to the surface of the reinforcement, the continuity of the coating and fast drying, and prevent carburization and dissolution of the steel reinforcement in the liquid iron. A known refractory paint is applied to the surface of the mold to reduce burns on steel and cast iron castings, including kyanite-sillimanite, water glass, ammonium chloride, DS hydrol and water. When applying such paint on the surface of steel reinforcement placed in the form with liquid iron, this reinforcement is carburized or even dissolved in the iron, resulting in ap. the maturum does not fulfill its direct purpose, i.e., the hardening of the iron casting due to the introduction of the framework does not occur. The closest to the invention of the STEEL REINFORCEMENT BATTERY of the essence and the achieved result is a refractory paint used to coat the produced models, which contains kyanite-sillimanite as a refractory filler and binder - hydrolyzed ethyl silicate 2. The paint is used in Ural Turbo engine them. KE Voroshilov. When this paint is applied to steel reinforcement and placed last in a mold with liquid iron, non-carburizing of steel reinforcement is observed. The aim of the invention is to prevent carburization of steel reinforcement or steel parts when casting with liquid iron. The goal is achieved by the fact that the known refractory paint based on kyanite-sillimanite and hydrolyzed ethyl silicate additionally contains titanium dioxide at the following ratio of ingredients, weight. %: Hydrolyzed ethyl silicate 40-50 Titanium dioxide 5-30 Distin-sillimanite The rest of the composition and properties of the firestone paint of the invention are given in Table. 1 and 2.

Steel reinforcement (CT-2) is painted by repacking. Drying is carried out in air for 20 minutes. The reinforcement is then placed in the mold and poured with molten iron at a temperature of 1350--1400 ° C.

The carburizing of the reinforcement was controlled by metallographic - the appearance of a pearlite structure in the steel on the cast iron – steel interface.

The content in the paint titanium dioxide from 5 to 30 weight. % provides a complete lack of carburizing steel reinforcement.

The decrease in the content of titanium dioxide (Ti02) in the paint is less than 5 wt. % leads to carburization of steel reinforcement. The increase in titanium dioxide content is above 30 wt. % in the paint causes it to peel off the reinforcement.

With a decrease in the content of hydrolyzed ethyl silicate in the paint less than 40 weight. % it is thickened, causing a thick layer of paint to be applied, peeling and high consumption.

With an increase in the content of hydrolyzed ethyl silicate in the paint above 50 weight. The applied paint layer loses its strength.

In the section of the casting with painted reinforcement, there is no fusion of reinforcement with cast iron, and there are also no gas shells, i.e. the continuity of the metal is not disturbed.

Table 1

table 2

Claims (1)

Claim Refractory paint for steel reinforcement, including distene sillimanite and hydrolyzed ethyl silicate, characterized in that, in order to prevent carbonization of steel reinforcement or 20 steel parts when cast iron, the paint additionally contains titanium dioxide in the following ratio of ingredients, weight. %: ₂₅ Hydrolyzed ethyl silicate 40-50 Titanium dioxide 5-30 Disten Sillimanite Else