SU1473902A1 - Method of producing friction articles - Google Patents

Abstract

The invention relates to the field of powder metallurgy, in particular to the production of friction discs by sintering powder linings to the steel frame, and can be used in mechanical engineering. The aim of the invention is to increase the strength of the connection of the friction lining to the steel frame. This is achieved by isothermal spraying of the intermediate powder layer of the following composition, wt.% 25-35 nickel, the rest is copper, and subsequent sintering of the friction layer to the steel frame. Moreover, the thickness of the intermediate sprayed layer is determined from the specified ratio, taking into account the diameter of the powder fraction of the sprayed layer. 2 tab.

Description

one

The invention relates to powder metallurgy, in particular to the production of friction discs by sintering powder linings, materials to stable supporting frameworks, and can be used in mechanical engineering.

The aim of the invention is to increase the strength of the joint between the friction lining and the steel frame.

For this purpose, a powder layer containing 25-35% nickel, the rest copper, is applied to the steel frame by thermal spray coating, and after joining with the friction linings, the latter are baked to the steel frame.

Example 1. Steel frame is subjected to abrasive treatment with electrocorundum. Using a gas-thermal spraying method, a layer containing 25 May% nickel, the rest copper, is deposited on the steel frame on both sides. The thickness of the sprayed layer is determined according to the ratio

where b is the thickness of the sprayed layer;

d is the diameter of the fraction of the sprayed layer;

n - coefficient depending on size

particles and spraying modes and equal to 0.9-1.5.

The thickness of the sprayed layer is 60-65 µm with a fraction of copper and nickel powders of 40-50 µm. Spray mode: A, B, plasma gas - nitrogen, gas consumption 6. For uniform distribution of nickel and copper powders, they are fed into the plasma powder from two independent feeders. The friction linings of the brand MK-5 are welded to the steel frame in hydrogen furnaces at 750 ° C with a pressure of 2.94 MPa for 12 hours

Example 2. The method is carried out as in Example 1, but the sprayed powder layer contains 30 May% nickel, the rest is copper.

Example 3. The method is carried out as in Example 1, but the sprayed powder layer contains 35 May. % nickel, the rest is copper

In tab. 1 shows the results of testing the strength of the connection of the friction lining with a steel frame in the manufacture of friction products known (soldering) and the proposed (thermal coating) methods.

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four

WITH

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Table 1

Intermediate-Composition Force of the open layer, kN

10% Sn, the rest

copper4,8

25% NI, the rest is copper

30% Ni, the rest

copper7.1

the rest

copper

7.1

7.0

In tab. Figure 2 shows the results of testing the strength of the joint between the friction lining and the frame, depending on the thickness of the coating, calculated from the ratio, where b is the thickness of the coating, µm; d is the diameter of the powder fraction, μm; n is the coefficient depending on the spray mode and the powder fraction.

table 2

Thickness of the inter-force of the ejection layer of the coating, kN ti, μm, with the fraction of the powder 40-50 μm

As follows from the table. 1 and 2, the proposed method allows a 1.5-fold increase in the strength of the joint between the friction lining and the steel frame in comparison with the known.

Claims (1)

Invention Formula A method of manufacturing friction products, including pretreatment of a steel frame, coating a copper-based powder layer on its surface, joining it with a friction lining and subsequent sintering, characterized in that, in order to increase the strength of the friction lining to the steel frame, the powder layer additionally contains Nickel, with the following content of ingredients, May. %: Nickel25-35 Copper Rest the powder layer is applied by thermal spraying, and its thickness is determined from the ratio , where b is the thickness of the powder layer, microns; d is the diameter of the sprayed layer fraction, um; n is a coefficient depending on the particle size and sputtering regimes and is equal to 0.9-1.5.