Bronze (Br) is mainly composed of copper and tin. In addition, phosphorus, zinc, lead and other elements are often added. Bronze materials are corrosion-resistant, wear-resistant, have good mechanical properties and casting properties, and are very resistant to corrosion in the atmosphere, sea water, fresh water or steam.
Advantages
- Extremely wear-resistant material
- Very heavy-high specific gravity
- Conductive
- The best wear resistance of any filled PTFE
- Large deformation strength
- Good thermal conductivity
Weakness
- Not suitable for electrical applications
- Poor chemical resistance
Bronze Filled PTFE
- Br/PTFE composite material has good comprehensive performance, bronze powder can improve the wear resistance, thermal conductivity, dimensional stability of PTFE composite material, reduce expansion coefficient, increase material strength and hardness, creep resistance and heat resistance.
Table 1. Comparison of performance parameters of bronze powder filled PTFE and pure PTFE
| | Pure PTFE | High-filled Br/PTFE |
|---|
| Color | Milky white | Copper or dark brown |
| Density (g/cm3) | 2.2 | 3.9 |
| Shore hardness D | 64 | 71 |
| Insulation | Non-conductive | Conductive |
| Chemical property | Almost resistant to any chemical corrosion | Not resistant to sulfide, liquid ammonia, acidic media, etc. |
| Tensile strength (MPa) | 238 | 101 |
| Elongation at break (%) | 27.6 | 12.7 |
| Compression set rate (%) | 8.12 | 1.90 |
| Compression 5% deformation rate (MPa) | 12.9 | 21.3 |
| Bending strength (MPa) | 20.7 | 28.0 |
| Coefficient of friction | 0.13 | 0.20 |
Note: The above data is for reference only. The actual product in use may vary due to different parts size, raw material batch type, and mechanical working conditions. In addition, the filled PTFE is a multi-element composite material, and the proportioning composition can be adjusted according to the actual working conditions of the customer, which is not fixed.
- Br/PTFE composite material has good comprehensive performance and can be widely used in hydraulic oil cylinders, cylinder sealing components, machine tool guides, bushings and other fields.
- Humidity and heat aging will affect the tribological behavior of PTFE polymer composites. In the aging time range, the abrasion resistance of the fiber-filled samples is reduced compared with the unaged samples. However, the friction and wear resistance of bronze-filled PTFE are enhanced by damp heat aging.
Figure 2. The results of dynamic friction and specific wear rate of samples with different aging time under two different temperatures under dry and water-lubricated sliding contact. Bronze PTFE (PB), Black glass fiber PTFE (PGF), MoS2+Black glass fiber PTFE (PGFM). [2]
References
- M. Trabelsi, M. Kharrat, M. Dammak, Trans Indian Inst Met 69 (2016) 1119–1128.
- Mohammad-Reza Homayoun, Arash Golchin, Nazanin Emami, Lubricants 6 (2018) 103.
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Figure 1. Optical micrographs of bronze-filled PTFE with different bronze content [1]
