SU1219670A1 - Compound for boron-copper plating of steel articles - Google Patents

Description

The invention relates to metallurgy, namely, to chemical heat treatment, and can be used in the manufacture of solder for soldering cutting tools.

The goal of the acquisition is to increase the working life of the composition and improve the plasticity of the products.

A composition for boron-reducing steel products, containing boron carbide, a copper-containing substance and alumina, contains copper chloride as a copper-containing substance.

Excessing the concentration of chloric copper over 35 wt.% And a decrease in the concentration of boron carbide less than 50 wt leads to a decrease in the mechanical properties of the solder compound due to the presence of an excess amount of copper with separate inclusions of boride eutetics, and a decrease in the concentration of copper less than 12 wt .% and, accordingly, an increase in the boron carbide content of more than 70 wt.% significantly reduces the plasticity of the boro-deposited layer and the mechanical properties of the solder joint.

Chlorine copper, having several decomposition (boiling) temperatures

Q

500 С, forms at the saturation temperature (800-1000 С) active copper atoms penetrating along the grain boundaries to a considerable depth.

Chlorine, which is formed during dissociation, is an activator of the boromide process and a carrier of boron and copper to the formed surface. At the same time, not only the speed of formation of the boron-deposited layer increases, but also the ulcerous destruction of the surface under formation is eliminated.

Chlorne copper, lowering the activation energy of the saturation process, contributes to obtaining deeper boron copper layers, characterized by high plastic characteristics

The use of the boro-deposited layer obtained from the mixture of the proposed composition, as a solder, improves the properties of the solder joint primarily by improving the ductility of the strength and reducing the tendency of the weld to brittle fracture.

ten

ts

2196702

Chlorine copper more fully carries: copper pz oxides, which forms in the mixture itself, which increases the working life of the mixture. 5 After five treatment cycles, the saturating mixture is updated with a regenerating additive — 3-4 wt.% Copper chloride and 5-6 wt.% Of boron carbide from the nepBOP initial mass of the mixture.

The introduction of the regenerating additive keeps the saturability of the mixture at the same level, allowing it to be used at least 30 times.

Example, In order to select the optimal composition of the mixture, eight compositions were used (see table), in which the content of components is, in%;

Boron carbide 70-50

Chlorine copper 8-40

Aluminum oxide 10-22

The proposed blend compositions are obtained by simple mechanical mixing of the dried components under normal conditions.

The proposed composition is used to apply a boron-deposited layer with a thickness of 0.3 mm to Pastin of steel 12X18H10T.

The powder mixture is poured into a container with a sand shutter, plates are placed so that the distance between them is at least 6 mm and the container is placed in an electric furnace.

Boromine regime: temperature

3 h, cooling - on

20

25

thirty

35

Y50 L ;, exposure to air.

Mechanical testing of solder joints was carried out on samples of the type T. (for high-speed steel-tensile testing) and type V — tests on the shear (for carbide),

B. The ratio of the mixture components to the plasticity of the products (the beginning of spallation) 5 working life and the tensile strength of the paired samples is shown in the table. I

Thus, as can be seen from the table, the working life of the proposed composition is increased compared with the known 10 times, the plasticity of products 5 times.

The known composition contains the following components, wt%: Boron carbide 9.5 Ammonium chloride 2.5 Aluminum oxide 2.5 Copper2.4 (in addition to the total mass).

Claims (1)

COMPOSITION FOR BORINNING OF Steel products containing boron carbide, a copper-containing substance and aluminum oxide, characterized in that, in order to increase the working life of the composition and to improve the ductility of products, it contains chlorine copper as a copper-containing substance in the following ratio of components, wt.%: Boron carbide 50-70 Chlorine Copper 12-35 Alumina Rest