Plain bearing and method of manufacturing the same

Abstract

A plain bearing is provided which has an Sn-and-Si-rich layer formed of an Al alloy containing Sn and Si, and a base material which does not contain Sn. The Sn-and-Si-rich layer have the sliding surface having an area ratio of Sn phase grains in a range of 6 to 40% and that of Si phase grains in a range of 5 to 25%.

1 . A plain bearing comprising: 
 a base material formed of an Al alloy which does not contain Sn; and    an Sn-and-Si-rich layer formed of an Al alloy containing Sn and Si, the Sn-and-Si-rich layer being adjacent to the base material and having a sliding surface,    wherein the sliding surface has an area ratio of Sn phase in a range of 6 to 40%, and an area ratio of Si phase in a range of 5 to 25%.    
     
     
         2 . The plain bearing according to  claim 1 , wherein the base material contains 0.1 to 1.5 mass % of Si, 0.2 to 5.0 mass % of Cu, and a total amount of 0.01 to 7.0 mass % of one or more selected from a group consisting of Mn, Cr, Mg, Zn, Ti, Zr, V and B.  
     
     
         3 . A method of manufacturing the plain bearing according to  claim 1 , comprising steps of: 
 providing a base material formed of an Al alloy which does not contain Sn;    bombarding the surface of the base material with powder of Sn and/or powder of an Al—Sn alloy and powder of Si and/or powder of an Al—Si alloy, so as to form a layer containing Sn and Si; and    rolling and annealing to form the Sn-and-Si-rich layer in which Sn phase and Si phase are crystallized and distributed in an Al alloy matrix.    
     
     
         4 . A method of manufacturing the plain bearing according to  claim 1 , comprising steps of: 
 providing a base material formed of an Al alloy which does not contain Sn;    scattering powder of Sn and/or powder of an Al—Sn alloy and powder of Si and/or powder of an Al—Si alloy on a surface of the base material formed of an Al alloy which does not contain Sn;    melting and alloying the powders by laser beam so as to form a layer containing Sn and Si; and    rolling and annealing to form a Sn-and-Si-rich layer in which Sn phase and Si phase are crystallized and distributed in an Al alloy matrix.    
     
     
         5 . A method of manufacturing the plain bearing according to  claim 2 , comprising steps of: 
 providing a base material formed of an Al alloy which does not contain Sn;    bombarding the surface of the base material with powder of Sn and/or powder of an Al—Sn alloy and powder of Si and/or powder of an Al—Si alloy, so as to form a layer containing Sn and Si; and    rolling and annealing to form the Sn-and-Si-rich layer in which Sn phase and Si phase are crystallized and distributed in an Al alloy matrix.    
     
     
         6 . A method of manufacturing the plain bearing according to  claim 2 , comprising steps of: 
 providing a base material formed of an Al alloy which does not contain Sn;    scattering powder of Sn and/or powder of an Al—Sn alloy and powder of Si and/or powder of an Al—Si alloy on a surface of the base material formed of an Al alloy which does not contain Sn;    melting and alloying the powders by laser beam so as to form a layer containing Sn and Si; and    rolling and annealing to form a Sn-and-Si-rich layer in which Sn phase and Si phase are crystallized and distributed in an Al alloy matrix.