Sliding member and method for manufacturing same

Abstract

A sliding member in which a sliding layer is capable of exhibiting excellent sliding characteristics in terms of seizure resistance, wear resistance and heat resistance.A method for manufacturing the sliding member of the present teachings is a method for manufacturing a sliding member to manufacture a sliding member sliding with a mating material. The manufacturing method includes irradiating particulate ultra high molecular weight polyethylene with radiation rays in a sealed state, and crosslinking the ultra high molecular weight polyethylene, preparing a composition for a sliding layer containing a solid lubricant and a binder resin, and forming a sliding layer sliding with the mating material by providing the composition for a sliding layer on a base material, and obtaining the sliding member. The solid lubricant includes the ultra high molecular weight polyethylene crosslinked during the irradiating and the crosslinking.

1 . A method for manufacturing a sliding member to manufacture a sliding member sliding with a mating material, comprising:
 irradiating particulate ultra high molecular weight polyethylene with radiation rays in a sealed state, and crosslinking the ultra high molecular weight polyethylene;   preparing a composition for a sliding layer containing a solid lubricant including the ultra high molecular weight polyethylene crosslinked during the irradiating and the crosslinking, and a binder resin; and   forming a sliding layer sliding with the mating material by providing the composition for a sliding layer on a base material, and obtaining the sliding member.   
     
     
         2 . The method for manufacturing a sliding member according to  claim 1 , wherein the irradiating and the crosslinking is performed under a condition that an absorbed dose of electron beams as the radiation rays is more than or equal to 60 kGy and less than 500 kGy. 
     
     
         3 . A sliding member comprising a base material, and a sliding layer formed on the base material, and containing a binder resin and a solid lubricant, the sliding layer sliding with a mating material,
 wherein the solid lubricant includes crosslinked ultra high molecular weight polyethylene that is particulate, and has a melting point that is more than 126.4° C. and less than or equal to 132.0° C.   
     
     
         4 . The sliding member according to  claim 3 , wherein the ultra high molecular weight polyethylene has a gel fraction of more than or equal to 26%. 
     
     
         5 . The sliding member according to  claim 3 ,
 wherein in the sliding layer, the solid lubricant is more than or equal to 25% by volume and less than or equal to 100% by volume with respect to the binder resin,   in the sliding layer, the binder resin is polyamide-imide, and   the ultra high molecular weight polyethylene is more than or equal to 5% by volume and less than or equal to 35% by volume with respect to all solid components in the sliding layer.   
     
     
         6 . The sliding member according to  claim 5 ,
 wherein the solid lubricant further includes molybdenum disulfide, and   in the sliding layer, the molybdenum disulfide is less than or equal to 26% by volume with respect to all solid components in the sliding layer.   
     
     
         7 . The sliding member according to  claim 6 , wherein in the sliding layer, the ultra high molecular weight polyethylene is more than or equal to 23% by volume and less than or equal to 35% by volume with respect to all solid components in the sliding layer, and the molybdenum disulfide is less than or equal to 15% by volume with respect to all solid components in the sliding layer. 
     
     
         8 . The sliding member according to  claim 5 ,
 wherein the solid lubricant further includes graphite, and   in the sliding layer, the graphite is more than or equal to 5% by volume and less than or equal to 30% by volume with respect to all solid components in the sliding layer.   
     
     
         9 . The sliding member according to  claim 3 ,
 wherein the ultra high molecular weight polyethylene has a gel fraction of more than or equal to 26%,   wherein in the sliding layer, the solid lubricant is more than or equal to 25% by volume and less than or equal to 100% by volume with respect to the binder resin,   in the sliding layer, the binder resin is polyamide-imide, and   the ultra high molecular weight polyethylene is more than or equal to 5% by volume and less than or equal to 35% by volume with respect to all solid components in the sliding layer.   
     
     
         10 . The sliding member according to  claim 9 ,
 wherein the solid lubricant further includes molybdenum disulfide, and   in the sliding layer, the molybdenum disulfide is less than or equal to 26% by volume with respect to all solid components in the sliding layer.   
     
     
         11 . The sliding member according to  claim 10 , wherein in the sliding layer, the ultra high molecular weight polyethylene is more than or equal to 23% by volume and less than or equal to 35% by volume with respect to all solid components in the sliding layer, and the molybdenum disulfide is less than or equal to 15% by volume with respect to all solid components in the sliding layer. 
     
     
         12 . The sliding member according to  claim 9 ,
 wherein the solid lubricant further includes graphite, and   in the sliding layer, the graphite is more than or equal to 5% by volume and less than or equal to 30% by volume with respect to all solid components in the sliding layer.   
     
     
         13 . The sliding member according to  claim 6 ,
 wherein the solid lubricant further includes graphite, and   in the sliding layer, the graphite is more than or equal to 5% by volume and less than or equal to 30% by volume with respect to all solid components in the sliding layer.