SU551392A1 - Sintered antifriction material - Google Patents

Description

one

The invention relates to powder metallurgy, in particular, to sintered antifriction nickel-based materials, operating in friction units without lubrication in the temperature range 20-7OOO C.5

Known sintered friction material based on Nickel, having the following composition, wt.%:

Iron5-ZO

Bor0.1-0.15 10

Barium fluoride1-30

Nickel The Rest.

The disadvantages of this material are low antifriction properties in the 15 temperature range of 20-700 o, insufficient mechanical strength and heat resistance.

The purpose of the invention is the creation of a sintered antifriction material based on nickel, capable of ensuring stable operation of the node-20 pa under conditions of dry friction in the temperature range 20-700 ° C, which has higher antifriction properties, mechanical strength and heat resistance.

For this, a sintered anti-

friction material, which differs from the known one in that it additionally contains copper oxide, lead oxide and silicon dioxide in the following ratio of components, wt.%:

Copper oxide 10-20

Lead oxide1-6

Silicon dioxide 1-5

Nickel The Rest.

Copper and lead oxides improve anti-friction and mechanical properties. Silicon dioxide is introduced into the alloy to increase the heat resistance.

The proposed material is manufactured by powder metallurgy, which includes the following operations: mixing powders, pressing blanks, sintering in a protective atmosphere.

In order to impart mechanical penetration to the material, re-pressing with annealing is allowed.

For the preparation of the alloy, the mixtures prepared in Table 1 were prepared. one.

For friction tests, annular specimens were manufactured according to the indicated technology, the size of: internal diameter-20 mm, external diameter 28 mm, height 8-10 mm.

The resulting alloys had the characteristics given in table. 2

As can be seen from the table, the antifriction properties of the proposed material in the temperature range 20-700 ° C are at a high level.

In addition, the proposed material has high mechanical strength.

when compressed (ce hedgehog. 65-68 kg / mm

about.

has high heat resistance at limited liability partnership C. The weight gain from oxidation of samples at this temperature in air for 200 hours is 96 g / m,

Table 1

Claims (1)

Claims Sintered antifriction material based on nickel, characterized in that, in order to improve antifriction properties at temperatures up to 7OO C, mechanical strength and heat resistance, it Table 2 50 additionally contains copper oxide, lead oxide and silicon dioxide in the following ratio of components, wt.%: Copper oxide O-2O Lead oxide 1-6 Silicon dioxide 1-5 Nickel Ostal.