Bearing material and method of producing same

A method of producing powdered and extruded composite bearing material containing Al as its main component comprising the steps of:

• mixing powdered materials to form a second powder mixture containing 0.5-40 wt% in total of at least one type of lubricant additive selected from the group consisting of low melting-point metal lubricants, solid lubricants, and plastics, and the balance Al and inevitable impurities;
• mixing powdered materials to form a first powder mixture containing primarily Al and lubricant additives in an amount smaller than that of the lubricant additive of the second powder mixture;
• forming a first bearing layer from the first powder mixture and a second bearing layer from the second powder mixture
• compacting said first bearing layer and said second bearing layer into a desired shape or each into an individual shape;
• subjecting the shaped material to a first heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• extruding the heat-treated, shaped material;
• subjecting the extruded material to a second heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• and
• rolling the heat-treated material, when necessary.

A method of producing powdered and extruded composite bearing material containing Al as its main component for producing a bearing, comprising the steps of:

• mixing powdered materials to form a second powdered mixture comprising 0.5-40 wt% in total of at least one type of lubricant additive selected from the group consisting of low melting-point metal lubricants, solid lubricants, and plastics, and the balance Al and inevitable impurities;
• mixing powdered materials to form a first powdered mixture containing a lubricant additive in an amount smaller than that of the lubricant additive of the second powdered mixture
• forming a first bearing layer form the first powdered mixture a second bearing layer from the second powdered mixture;
• arranging a powdered Al or Al alloy layer as a bonding or adhesive layer in such a manner that said adhesive layer is in contact with the other face of said first bearing layer;
• compacting said arranged three layers into a desired shape;
• subjecting the shaped material to a first heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• extruding the heat-treated, shaped material;
• subjecting the extruded material to a second heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• and
• rolling the heat-treated material, when necessary.

A method of producing powdered and extruded composite bearing material containing Al as its main component comprising the steps of:

• mixing powdered materials to form a bearing metal layer comprising 0.5-40 wt% in total of at least one type of lubricant additive selected from the group consisting of low melting-point metal lubricants, solid lubricants, and plastics, and the balance Al and incidental impurities;
• preparing powdered Al or Al alloy layer;
• compacting said two layers into a desired shape or each individually into a desired shape;
• subjecting the thus shaped material to a first heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• extruding the heat-treated, shaped material;
• subjecting the extruded material to a second heat treatment at a temperature below the temperature for initiating solidification of the bearing material;
• and
• rolling the extruded material, when necessary.