SU1019015A1 - Composition for producing boride coatings on steel products - Google Patents

Abstract

COMPOSITION FOR PRODUCING COATINGS ON STEEL PRODUCTS containing boron and sodium fluoride, characterized in that, in order to increase the activity of the saturating medium, it additionally contains bentonite in the following ratio, wt .: Boron carbide 60-80 Sodium fluoride 5-20 Bentonite 10 -25

Description

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About 01

Ieobretienis refers to metallurgy, namely to chemical-thermal production, -; can be used to improve the properties of the surface layers of iron-based alloys,

The boron izdesten composition containing the following components, wt.%: Sodium fluoride 0-60; boron carbide - (OH fl.

About / However, this composition is not designed for use in the conditions of long-term temperature-freezing {ek and, therefore, can not be used for diffusion hardening of large-sized products,. requiring prolonged heating of the furnace environment.

The closest in technical terms; Nost -1 is achieved. The effect of bororssania is related to the effect of Brazil, which includes the following components:

Boron carbide 5-60

5orn th anhydride 2-10

F orist th

matry5 5

Iron oxide25- 46 The known composition allows for boring at oxidative conditions, without securing equipment under conditions of high temperature exposures. However, upon saturation of this composition, relatively shallow borated spi

The aim of the invention is to increase the ac: t of the inherent saturation of the

The goal is achieved by the fact that the composition fi.nft of obtaining of the sixth coatings on steel products x containing boron carbide and

Sostaae cf: ecH - boron carbide I sodium fluoride

Bentonite

sodium fluoride, additionally contains bentonite in the following ratio of components, masd: Boron carbide 60-80

Sodium fluoride 5-20 Bentonite 10-25 Bentonite is a clay, consisting of 5, mainly of the minerals of the montmorillonite group (CnlO) and bitdellite 510lP). Ledlochny composition allows to carry out the boribrganization process in a conventional furnace environment with long high-temperature exposures and to obtain boride layers of greater thickness than in the case of using the known composition

Example. Diffusion saturation of steel samples with 5 sizes of 10x10x10 mm is carried out, Coasters are prepared by mixing powder components (fraction size 0.05 0, 25 mm), 8ODOD is introduced into the prepared mixture in quantities that provide dough consistency, and apply samples with a layer of at least 5 mm. The sample tray is placed in an electric furnace at a temperature of 900 ° C. The duration of the diffusion saturation is h. After that, the samples are subjected to research. The research results are presented in the table.

Boron carbide (GOST (}, sodium fluoride NaF (GOST 4463-76 and bentonite (a powder component widely used in foundry)) is used for diffusion saturation.

The data in the table show that the sizes of diffusion layers obtained from the proposed compositions in, 3, 5 are larger.

Boride layer thickness, micron

Claims (1)

COMPOSITION FOR PRODUCING BORIDE COATINGS ON STEEL PRODUCTS, containing boron carbide and sodium fluoride, characterized in that, in order to increase the activity of the saturating medium, it additionally contains bentonite in the following ratio of nents, wt.%: Boron carbide 60-80 Fluoride sodium 5-20 Bentonite 10-25 10190V;