CZ9901709A3 - Metal-ceramic friction material - Google Patents

Abstract

In the present invention there is disclosed a metal-ceramic friction material containing 50 to 65 percent by weight copper (Cu), 3 to 7 percent by weight tin (Sn), 6 to 14 percent by weight iron (Fe), 8 to 13 percent by weight graphite (C), 2 to 6 percent by weight enstatite (MgSiOi3) and 5 to 15 percent by weight zirconium silicate (ZrSiOi4).

Description

Metal-ceramic friction material

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a bronze-based metal-ceramic friction material, in particular for dry friction, produced by powder metallurgy processes.

BACKGROUND OF THE INVENTION

Bronze-based friction materials operating in dry friction nodes must have sufficient durability, relatively high coefficient of friction and good fluidity include non-metal-based metal-ceramic friction materials that provide

For this reason, bronze metal and desirable properties (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ),

SiOJ.

(3 Al ₂ 0 ₃ .2 material. Metallic particles, copper (Cu) and tin (Sn)) form a basic metal skeleton in which sliding and abrasive non-metallic components such as carbon (C), silicon dioxide, silicon carbide (SiC) and mullite

The disadvantage of these materials is the dependence of the coefficient of friction on the operating temperatures, high thermal conductivity and, in particular, insufficient abrasion resistance in dependence on the temperature that arises in the friction process. Increased specific pressures and higher speeds often result in increased wear, resulting in more frequent replacement of the lining, which is undesirable from a working and functional point of view.

SUMMARY OF THE INVENTION

The above-mentioned disadvantages are overcome by a bronze-based metal-ceramic friction material, intended especially for working in dry friction nodes, produced by powder metallurgy processes according to the invention, which comprises 50 to 65 wt. % copper (Cu), 3 to 7 wt. tin (Sn), 6 to 14 wt. % iron (Fe), 8 to 13 wt. % of graphite (C), 5 to 15 wt. % zirconium silicate (ZrSiO ₄ ), 2 to 6 wt. enstatite (MgSiO ₃ ).

Výhaďy

The basic advantage of this material is increased abrasion resistance at a sufficiently high coefficient of friction of 0.450 to 0.650 and sufficient stability under different temperature conditions. A suitable combination of a basic metal skeleton with a sliding and friction abrasive component with a relatively high proportion of lubricants

material with sufficient temperature stability up to 600 ° C, friction coefficient, increased abrasion resistance and uniform smooth grip.

The material according to the invention can be made by conventional powder metallurgy processes, i.e. the starting powder components are mixed in the desired ratio in a mixer, the mixture is compressed at a pressure of 100 to 300 MPa and sintered at 400 to 800 kPa in furnaces with a protective atmosphere such as hydrogen. The sintered material can be pressed, calibrated or machined if necessary.

The benefit of the metal-ceramic friction material of the present invention can be seen in a suitable combination of the starting components copper (Cu), tin (Sn), iron (Fe), zirconium silicate (ZrSiCQ), graphite (C) and enstatite (MgSiO ₃ ).

The new friction material differs from the previously known compositions by the relatively high content of graphite and enstatite sliding components.

DETAILED DESCRIPTION OF THE INVENTION

1. The combination and content of ingredients is in accordance with the present invention:

% wt. % copper (Cu) = base metal skeleton component tin (Sn) = base metal skeleton component iron (Fe) = constituent metal backbone graphite (C) = sliding component wt. enstatite (MgSiO ₃ ) = sliding component wt. zirconium silicate (ZrSiO) = friction component

The material of this composition achieves a coefficient of friction of 0.60.

2. Combination and content of ingredients.

is in accordance with the present invention:

63.5 % wt 5 % wt 10 % wt 10 O. Ό wt 5 O. O wt 6.5 % wt

copper (Cu) = tin metal skeleton (Sn) = iron metal skeleton (Fe) = graphite metal skeleton (C) = sliding enstatite component (MgSiO ₃ ) = zirconium silicate sliding component (ZrSiO) = component frictional.

The material of this composition has a coefficient of friction of 0.55.

Industrial applicability

The material according to the invention is used for the production of brake linings, in particular for two-wheel motor vehicle brakes.

Claims (1)

Bronze-based metalloceramic friction material, preferably for use in dry friction knots, made by powder metallurgy processes, characterized in that it contains 50 to 65% by weight of copper (Cu), 3 to 7% by weight. tin (Sn), 6 to 14 wt. 8 to 13% by weight of graphite (C), 2 to 6% by weight of iron (Fe); % of enstatite (MgSiO ₃ ) and 5 to 15 wt. zirconium silicate (ZrSiO).