Sintered Copper and Copper Alloys
This family includes copper-based sintered materials intended for structural applications: pure copper, brass and structural or self-lubricating bronzes. These materials are selected when conductivity, appearance, corrosion resistance, machinability or friction-related properties become priorities.
A family focused on function and appearance
Sintered copper alloys are selected for functions where steel is not always the most suitable solution: electrical or thermal conductivity, decorative appearance, corrosion resistance, machinability or tribological behavior.
- Pure copper electrical or thermal conductive parts
- Mechanical and hardware components made from brass
- Self-lubricating bronze-graphite bushings for guiding and rotation
- Structural bronze for strength, corrosion resistance, appearance or moderate friction
Conductivity, machinability or appearance
Pure copper is primarily selected for its conductivity. Brass provides a good balance between appearance, strength and machinability. Self-lubricating bronze offers an integrated lubrication reserve and better corrosion resistance than brass. Bronze also remains relevant for certain structural or friction-related functions.
Application areas
This overview summarizes the typical uses of structural sintered copper materials, with a focus on function, appearance and manufacturing cost.
| Family | Typical applications | Main advantage |
|---|---|---|
| Sintered pure copper | Contacts, conductive parts, thermal or electrical components | Very good electrical and thermal conductivity |
| Sintered brass | Hardware, small mechanical parts, decorative components | Brass appearance, good machinability and acceptable mechanical strength |
| Self-lubricating graphite bronze | Bushings, sleeves, guides and parts operating with limited external lubrication | Integrated lubrication thanks to open porosity and oil impregnation |
| Structural sintered bronze | Dense structural parts, components subjected to moderate friction or corrosion | Good balance between strength, appearance, corrosion resistance and friction behavior |
Indicative mechanical properties
The ranges below summarize typical values for sintered copper materials in SI units. They are intended for preliminary design guidance; final selection depends on density, composition and any repressing or machining operations.
| Material family | Typical density | Apparent hardness | Tensile strength |
|---|---|---|---|
| Sintered pure copper | 8.0 – 8.3 g/cm³ | 25 – 30 HRH | 160 – 190 MPa |
| Sintered 90/10 brass | 7.6 – 8.1 g/cm³ | 65 – 80 HRH | 120 – 160 MPa |
| Self-lubricating graphite bronze | 6.1 – 7.0 g/cm³ | 27% – 15% open porosity | 110 – 180 MPa radial |
| Structural sintered bronze | 7.2 g/cm³ | 82 HRH | 150 MPa |
Economic approach to material selection
Copper alloys should be selected when their specific function justifies the material cost: conductivity, appearance, corrosion resistance, machinability or friction behavior. For purely structural parts, sintered steel often remains a more economical solution.
| Industrial requirement | Material orientation | Compromise to monitor |
|---|---|---|
| Electrical or thermal conductivity | Sintered pure copper | Excellent functional choice, but higher material cost than steels |
| Brass appearance and machinability | Sintered brass, possibly leaded depending on requirements | Good compromise between appearance, machining and strength, to be validated according to regulations |
| Self-lubricating function | Graphite bronze with controlled open porosity | The porosity required for impregnation reduces maximum mechanical strength |
| Friction or corrosion with moderate strength requirements | Dense sintered bronze | Relevant if the function justifies bronze rather than steel or a dedicated bearing solution |
Design considerations
For sintered copper materials, the primary function must be clearly defined: conductivity, appearance, machinability, corrosion resistance, self-lubrication or mechanical strength. Repressing can improve dimensional tolerances and certain mechanical properties, but may also reduce ductility.
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