Method for coating a cylinder sleeve

Abstract

The invention relates to a method for coating a cylinder sleeve consisting of an iron-based material. A first layer and a second layer made of a zinc alloy are injected onto the outer surface using a thermal injection method. A good metallic connection between the cylinder sleeve and the cylinder crankcase, wherein the cylinder sleeve is poured, is produced by using alloyed or unalloyed copper for the first layer and by using a zinc-aluminum-alloy for the second layer.

1 . Method for coating a cylinder sleeve made of an iron-based material, whereby a first layer and a second layer of a zinc alloy are sprayed onto the outer surface of the cylinder sleeve, using a thermal spraying method, comprising the following method steps, copper or a copper-based alloy is sprayed onto the outer surface of the cylinder sleeve as a first layer, and a zinc-aluminum alloy is sprayed onto the first layer as a second layer. 
   
   
       2 . Method according to  claim 1 , wherein 99.9% copper is sprayed on as the first layer. 
   
   
       3 . Method according to  claim 1 , wherein a CuAl8 alloy is sprayed on as the first layer. 
   
   
       4 . Method according to  claim 1 , wherein a CuAl8Ni2 alloy is sprayed on as the first layer. 
   
   
       5 . Method according to  claim 1 , wherein a CuP8 alloy is sprayed on as the first layer. 
   
   
       6 . Method according to  claim 1 , wherein a CuSi3 alloy is sprayed on as the first layer. 
   
   
       7 . Method according to  claim 1 , wherein a CuZn alloy having up to 45 wt.-% zinc is sprayed on as the first layer. 
   
   
       8 . Method according to  claim 7 , wherein a CuZn37 alloy is sprayed on as the first layer. 
   
   
       9 . Method according to  claim 1 , wherein the first layer has a thickness between 60 μm and 130 μm. 
   
   
       10 . Method according to  claim 1 , wherein a ZnAl alloy having 3 to 20 wt.-% aluminum is sprayed on as the 2 nd  layer. 
   
   
       11 . Method according to  claim 10 , wherein a Zn85Al15 alloy is sprayed on as the 2 nd  layer. 
   
   
       12 . Method according to  claim 10 , wherein copper is alloyed into the 2 nd  layer. 
   
   
       13 . Method according to  claim 1 , wherein the cold gas spraying method is used for spraying on the 1 st  and/or the 2 nd  layer. 
   
   
       14 . Use of copper or of a copper-based alloy as a first layer to be applied to a cylinder sleeve made of gray cast iron, and use of a zinc-aluminum alloy as the second layer to be applied to the first layer.