CS198744B1 - Metallic-ceramic friction material - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to copper-based metal-ceramic friction material for increased thermal loads, particularly when dry.

The existing metal-ceramic friction materials are used especially where demanding operating conditions do not allow the use of now classic asbestos materials. They are characterized by a sufficient coefficient of friction, good thermal conductivity, relatively high abrasion resistance. They usually contain a number of components, many of which do not react during technological processing, so that the resulting product is a heterogeneous mixture of non-metallic particles firmly anchored in the matrix. In general, the individual components of the metal-ceramic friction materials are divided into three groups, and the components forming a solid metal skeleton, the components acting as glidants to prevent seizure of the contact surfaces of the friction knot and the abrasive components. Harmonization of the ratio of individual components affects both the basic properties of these materials, namely the coefficient of friction, the amount of specific abrasion and, in particular, the thermal stability of these materials. These materials are used both for dry friction, for example in brakes or for oil bath friction, for example clutch lining and the like.

The disadvantage of existing friction metal-ceramic materials is the relatively low coefficient of friction and, in particular, the course of the coefficient of friction, which is highly temperature-dependent. In the application of »8 743 2 <I, and in the case of the material, a coefficient of friction in the case of material aa bal kelesa has an increase in the coefficient of friction and the coefficients of friction in the aévialoati and three ual, respectively oelého and machine.

The above-mentioned drawbacks are remedied by the metal-ceramic copper-on-white material for increased lipophilicity when used in the present invention, the composition of which is based on the amount of copper. 1 to 6% by weight of graphite, 1 to 6% by weight of molybdenum disulphide and 7 to 15% by weight of molybdenum.

The basic advantage of this material is the stability of the coefficient of friction in a wide range of working conditions, high ottorrvadornoat and increased values of the coefficient of friction. These properties can also be maintained at elevated temperatures, for example a specific pressure difference of 0.98 and 1.96 MPa at a velocity of up to 20 m / a, water to slight differences in the size and friction of the friction.

The material according to this invention is manufactured as follows. The powdered eraser is preferably pressed in a metallic material and sintered loosely or under external pressure in a protective atmosphere, i.e. by powder metallurgy techniques, after perfect hoaogenesis.

Example 1

A co-ordinated selection of stanzas and base metal skeleton, metal stanchions, and glides include the following example of the stanchions (given in her weight),

It eats graphite, 5 eats MoSr, ie, sliding blocks and

Eat oulllt, 3 Eat Po, ie, shake verse.

Claims (1)

of the invention Copper-base copper-based rubbing material for increased thermal loads, especially in the case of auohole, characterized in that it contains 65 to 60 wt% copper, 4 to 8 wt% iron, 1 to 10 wt% iron, 1 to 6 wt% graphite, 1 to 6 wt.% Molybdenum disulfide and 7 to 15 wt.