SU954487A1 - Sintered iron-based frictional material - Google Patents

Description

The invention relates to powder metallurgy, in particular to sintered materials that can be used in friction devices.

Known sintered friction material based on iron, 1 having the following composition, wt.%:

Iron64

Copper10

Graphite8

Ferrous sulphate 5 Silicon carbide 5

Boron carbide5

Asbestos3

The disadvantage of this material is low frictional and strength characteristics: low coefficient of friction, high wear and low strength. Thus, the coefficient of friction of a known material is 0.28–0.37, linear wear 6–13 μm / brake, tensile strength at bending 10–14 kg / mm.

The closest to the present invention is a sintered friction material based on iron 2, having the following composition, weight. %:

Copper 4-15

Nickel sulphate 2-8 Graphite4-10

Sitall2-10

Lead2-8

IronErest

The disadvantage of this material is not enough high wear resistance, coefficient of friction and strength properties.

The purpose of the invention is to improve the Q-resistance and the coefficient of friction and strength properties of an iron-based friction material.

The goal is achieved by the fact that the sintered friction material based on iron additionally contains asbestos, calcium disilicide, silicon, silicon carbide and iron disilicide in the following ratio of components, weight. %:

Copper 1-5

20

Nickel sulfate 3-6 Graphite4-8

(italtl1-3

Calcium Disilicide 3-10 Silicon Carbide 0.2-1

25 Silicon 0.4-2

Iron Disilicide 0.4-5 Asbestos 0.5-5

IronErest

Claims (2)

Calcium disilicide, silicon, silicon carbide and iron disilicide (leboit) make up the silicocalcium alloy, the presence of which in the composition of the proposed material contributes to an increase in the coefficient of friction wear resistance. In addition, the presence of iron disilicide provides strong adhesion of the alloy to the base material, which also contributes to improving the wear resistance. Example. The powders of graphite, silicocalcium, are dried at a temperature of 150 ° C. Then all the initial powders are taken in the following ratio, wt%: copper 5, nickel sulphate graphite 8, sitalall 3, disilicide calcium, 3, silicon 0.4, silicon carbide 0.2, iron disilicide 0.4; iron asbestos 72, sift and mix in a mixer in the presence of oil (0.5% by weight of the mixture) for 10 hours. The prepared mixture is pressed in a mold at a specific pressure of 4 tons / mm, and the resulting products in friction the linings are sintered with a modern sintering to a steel base at a pressure of 20 kg / cm and a temperature of 1030 ° C for 3 hours. The material obtained has the following characteristics: Impact strength 0.7 kg / Tensile strength 12.5 kg / m Friction coefficient 0.38 without lubricant with lubricant 0,13 Material wear per 100 brake without lubricant 18 microns with lubricant 8 m km P R i m e p 2. The material obtained according to the technology given in example 1, from powders taken in relation Weight ratio,%: copper 2, nickel sulphate 4; graphite b; Sitall 2; calcium disilicide 7, silicon 1.5; silicon carbide 0.5; Iron disilicide 1, asbestos 3, iron 73, has the following characteristics: Impact strength 0.7 kgm / cm Tensile strength .13 kg / mm Friction coefficient without lubricant0.40 with lubricant0.14 Material wear per 100 braking without lubrication15 μm with lubricant5 µm PRI me R 3. The material obtained according to the technology given in example 1, from powders taken, wt.%: copper 1; Nickel sulfate b, graphite 4, sitall 1; calcium disilicide 10; silicon 2, silicon carbide 1; iron disilicide 2; asbestos 0.5; iron 72.5, has the following characteristics: Impact viscosity 0.7 kgm / cm Tensile strength 12.3 kg / mm Friction coefficient without lubrication0.38 with lubricant0.13 Material wear per 100 braking without lubrication17 μm with lubricant. 7 microns. Thus, in the proposed material, the strength properties are 12.3 kg / mm, the coefficient of friction with lubrication is 0.13-0.14 when worn 4-8, without lubricant 0.38-40 when worn 15-18. The main characteristics of the proposed iioro and famous friction materials are presented in the table. As can be seen from the table, the material offered has a higher coefficient of friction, wear resistance and strength properties than the material is known. Claims Sintered friction material based on iron, containing copper, nickel sulphate, graphite, sitall, in order to improve wear resistance, friction coefficient and strength properties, it additionally contains asbestos, calcium disilicide, silicon silicon carbide and iron disilicide. the ratio of components, wt.%: Nickel sulphate Graphite Sitall Calcium disilicide Silicon carbide Silicon Iron disilicide Asbestos Iron Rest Sources of information, taken into account during the examination 1. Powders and metallurgists, Collection. Materials of the IX All-Union Conference on Powder Metallurgy. a, 1968, pp. 169-173. 2. USSR author's certificate 03927, cl. C 22 C 33/02, 1974.