Introduction
In the modern industry, the demand for filtered fluids and gases has increased. The proper function of the machines required cleansed fluids and gases for their adequate running. Sintered bronze filters have a variety of shapes, can be used repeatedly, and provide robust performance.
The equipment used in different industries, like automotive, hydraulic systems, and fluid pipelines, requires filtration to extend the life span of the equipment and reduce wear and tear.
In this article, you will learn about how sintered bronze filters are made and their advantages.
Sintered Bronze Filter Manufacturing Process
Before getting into the details of the process of manufacturing the sintered bronze filters, it is essential to know the chemical composition of the filter. The metals used during the manufacturing process are bronze, 85–90% copper, and 10–15% tin, and all these metals are sintered together to form filters. Sometimes, to increase the strength, nickel and zinc could be added as well.
- The first step in the sintering process of the sintered bronze filters is the powder selection. All the metal powders are added together.
- The size of the particles that are compressed into a filter form determines the filter’s porosity. The metal powder is placed inside a mold and compressed at 100-400MPa.
- The material mixture is heated at 750-850 degreesbelow the melting point of the bronze for sintering.
- The pores are very precise and provide outstanding filtration by 5-100 micronsof pore size.
- The filters formed by the sintering process have mechanical strength up to 5-10 barand can bear temperatures up to 250-450 °C.
Advantages of Sintered Bronze Filters
The use of sintered bronze filters has many advantages, such as mechanical strength, heat and corrosion resistance, and long service life. Let’s get into the details of the benefits of using sintered bronze filters.
Mechanical Strength
Different industries are using sintered bronze filters because of their high mechanical strength.
- The tensile strength of the filter is around 3 to 5 Kg/mm²(approximately 30 to 50 MPa.
- The filters that could be in discs, tubes, plates, and cup shapes, the pore density of the filter decides the rigidity of the filter. The density of the sintered bronze filter is almost 5 to 6.5 g/cm³.
- High mechanical stability makes the filter withstand high temperature and pressure without getting deformed or cracked.
- The mechanical strength of the sintered bronze filters has made them chemically resistant and allows them to be used for chemical filtration.
Heat and High-Temperature Resistance
Many industries are using sintered bronze filters for their filtration process because of the feature that they can withstand heat and have high temperature resistance.
- The temperature resistance of the sintered bronze filters depends on the environment in which they are used.
- If filters are in use in an oxidizing environment, then the temperature resistance could be 250 °C or 392 °F.
- While in a reducing environment, the temperature resistance is higher, that is, 450°C.
Corrosion Resistance
The composition of the sintered bronze filter has bronze, copper, tin, and sometimes zinc or nickel. All these metals have inherited corrosion resistance. So, the sintered bronze filters have high corrosion resistance, which makes them suitable for use with corrosive materials. These filters have high resistance to chemical and environmental corrosion because of the alloy combination used in the manufacturing process.
High Porosity and Permeability
The manufacturing of sintered bronze filters has created a network of interconnected pores on the surface.
- The interconnection of the pores has created the permeability in the filters. This provides a greater surface area for the filtration.
- The benefit of using uniformly distributed sintered bronze filters is that the fluid maintains its pressure during the filtration.
- You can filter large amounts of material using these filters.
Long Service Life
The thermal and mechanical strength of the filters has enabled them to be used in harsh environments. The average life span of a sintered bronze filter is around 10 years in a hydraulic system if appropriately maintained. Plastic or ceramic filters cannot be used for an extended period and suffer wear and tear.
Economical and Efficient
The sintered bronze filters can be reused after the cleansing process. The process can cleanse these filters of:
- Backlashing
- Ultrasonic filtration
- Chemical filtration
The filters have the filtration efficiency of around 0.1μm to 250μm, which allows them to filter silicon dioxide, rust, and sediment. The approximated efficiency of the sintered bronze filter is around 98%.
Applications
Sintered bronze filters have applications in many industries.
· Compressed Air System
In a compressed air system, sintered bronze filters are used to remove water, particles, and oil mist. That will help prevent the different parts of the system, such as valves and regulators, from getting damaged.
· Hydraulic system
In a hydraulic system, the sintered bronze filters are used to protect the pumps and control valves from being contaminated with foreign particles and dust. It will help the system to maintain the integrity of its parts.
· Medical and Food Equipment
In the medical and food industry, the filters are used to make the air sterile. As they are easy to clean and sanitize, they can be used in nozzles and precision dispensers.
· Chemical Industries
Sintered bronze filters have chemical resistance, and they can be used in chemical industries for filtering chemicals. The flow of the chemical is maintained during the process, and the controlled reaction is executed.
· Automotive Industry
The automotive industry uses the sintered bronze filters for making the vents more breathable, fuel and oil filtration, and maintaining a controlled emission system.
Sintered Bronze Filters vs. Sintered Stainless Steel
| Features | Sintered Stainless Steel | Sintered Bronze Filters |
| Material | Stainless steel powder 316L or 304L | Copper alloy and bronze powder |
| Mechanical strength | Very high | Moderate |
| Filtration accuracy | 2–200 µm precise | High accuracy |
| Corrosion resistance | Excellent | Good |
| Temperature resistance | up to 600°C | up to 450°C |
| Chemical resistance | Weak | High |
| Durability | Very long and can be reused | Long and reused |
| Cost | Higher | Lower |
Conclusion
Sintered bronze filters are dependable, economical, and long-lasting options for filtration in numerous industries. In high-demand industries such as hydraulic systems, compressed air units, and chemical processing plants, and for severe environments. Their great mechanical strength, corrosion resistance, and high-temperature withstanding are helpful. Uniform porosity guarantees effective filtration at consistent flow rates.
Their reusability makes them more valuable economically. Sintered bronze filters are also a cheaper alternative to stainless steel filters and have considerably longer service lives and high chemical resistance. In general, sintered bronze filters are necessary for protecting equipment, providing cleaner and more efficient operation, and improving operational efficiency.