Metal-ceramic composites for tribological uses and defined sliding/friction pairs based on said materials

Abstract

The friction heat generated between both sliding pairs and friction pairs has to be swiftly dissipated in older to maintain a lubricant film or ensure constant coefficients of friction. The invention consequently relates to metal-ceramic composites for friction/sliding uses, which are characterized by basic compositions containing 30 to 75 percent by volume of one or several metallic phases, preferably aluminum and the alloys thereof, and 25 to 70 percent by volume of one or several non-metallic inorganic component/s as ceramic materials, preferably silicon carbide, aluminum oxide, titanium oxide, and silicates.

1 - 18 . (canceled)  
     
     
         19 . A metal-ceramic composite for friction/slide application, comprising a base composition comprising at least one metallic phase in a proportion of 30 to 75 vol. % and at least one non-metallic inorganic component in a proportion of 25 to 70 vol. % as a ceramic material the composite having a thermal conductivity greater than 50 W/mK, a flexural strength of about 300 MPa and a modulas of elasticity of at least 160 GPa.  
     
     
         20 . A metal-ceramic composite according to  claim 19 , wherein the composition contains 40 to 60 vol. % of Al 2 O 3  and 60 to 40 vol. % of Al.  
     
     
         21 . A metal-ceramic composite according to  claim 20 , wherein the thermal conductivity is greater than 50 W/mK, the flexural strength is about 300 MPa and the modulus of elasticity is about 160 GPa.  
     
     
         22 . A metal-ceramic composite according to  claim 19 , wherein the composition contains 60 to 80 vol. % of SiC and 40 to 20 vol. % of Al.  
     
     
         23 . A metal-ceramic composite according to  claim 22 , wherein the thermal conductivity is at least 180 W/mK, the flexural strength is about 300 MPa and the modulus of elasticity is about 200 GPa.  
     
     
         24 . A metal-ceramic composite according to  claim 19 , wherein the surfaces in contact with a friction/slide partner have an Ra value below 1 μm.  
     
     
         25 . A sliding ring comprising a metal-ceramic composite of  claim 19 .  
     
     
         26 . A slide/friction pairing comprising a metal-ceramic composites according to claim  1 , wherein the pairings comprise one partner consisting of a metal-ceramic composite (MCC) and one partner consisting of MCC, carbon, Al 2 O 3 , SSiC, hard metal (HM), ZTA (Al 2 O 3  and ZrO 2 ) or plastic, optionally fibre-reinforced.  
     
     
         27 . A slide/friction pairing according to  claim 26 , selected from the group consisting of MCC/carbon, MCC/Al 2 O 3 , MCC/SSiC, MCC/MCC, MCC/HM and MCC/ZTA (Al 2 O 3 +ZrO 2 ).  
     
     
         28 . A slide/friction pairing according to  claim 26 , selected from the group consisting of MCC/carbon, MCC/Al 2 O 3 , MCC/SSiC, MCC/MCC, MCC/HM and MCC/plastic, optionally fibre-reinforced.  
     
     
         29 . A slide/friction pairing according to  claim 26 , selected from the group consisting of MCC/carbon, MCC/SSiC, MCC/Al 2 O 3 , MCC/MCC, MCC/HM and MCC/ZTA.  
     
     
         30 . A slide/friction pairing according to  claim 26 , selected from the group consisting of MCC/SSiC, MCC/Al 2 O 3 , MCC/MCC, MCC/HM and MCC/ZTA.  
     
     
         31 . The metal-ceramic composite of  claim 19 , wherein said at least one metallic phase comprises aluminum or an aluminum alloy.  
     
     
         32 . The metal-ceramic composite of  claim 19 , wherein said ceramic material is selected from the group consisting of silicon carnie, aluminum oxide, titanium oxide and a silicate.