Sintered Metal Fiber Felt

A sintered metal fiber felt is a specialized type of porous material used in various industrial applications. It is made by compressing and sintering layers of metal fibers to create a structure with interconnected pores. The sintering process involves heating the fibers to a temperature below their melting point, causing them to bond together.

The metal fibers used in sintered metal fiber felts are typically made of materials such as stainless steel, bronze, nickel, or other alloys. The choice of metal depends on the desired properties of the final product, such as corrosion resistance, temperature resistance, or chemical compatibility.

Materials of Sintered Metal Fiber Felt

Sintered metal fiber felts are made from various types of metal fibers, and the choice of materials depends on the specific requirements of the application. Some common materials used in the manufacturing of sintered metal fiber felts include:

  • Stainless Steel: Stainless steel is a popular choice due to its excellent corrosion resistance and durability, commonly used grades include 316L, 316, 304, etc. It can withstand exposure to various chemicals and high-temperature environments.
  • Pure Nickel: Nickel-based alloys are used when superior corrosion resistance is required, particularly in harsh chemical environments or applications with extreme temperatures.
  • Bronze: Bronze offers good mechanical strength, thermal conductivity, and corrosion resistance. It is often used in applications where stainless steel may not be suitable, such as situations involving highly acidic or alkaline environments.
  • Inconel: Inconel is a specific type of nickel-chromium-based superalloy that offers exceptional resistance to high temperatures, oxidation, and corrosion. It is commonly used in aerospace and high-temperature applications.
  • Hastelloy: Hastelloy is another nickel-based superalloy known for its outstanding corrosion resistance in highly corrosive environments containing acids, chlorides, and other aggressive substances.
  • Copper: Copper-based sintered metal fiber felts are used in applications requiring good electrical conductivity and thermal conductivity.
  • Titanium: Titanium offers excellent corrosion resistance and is often used in applications where weight is a critical factor, such as in aerospace or marine environments.
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Filter Fineness / Filter Rating

Sintered metal felts are available in a wide range of filter ratings, from coarse to fine. Some common filter ratings for sintered metal felt include 1 micron, 5 microns, 10 microns, 20 microns, and higher. Specialized applications may require even finer filter ratings, and manufacturers can provide customized solutions based on the desired level of filtration efficiency.

Specifications of Stainless Steel Sintered Felt
Model No. Absolute Rating, μm Bubble Point Pressure, Pa Average Air Permeability, l/dm2/min Thickness, mm Weight, g/m2 Porosity, % Dirt Holding Capacity, mg/cm2
SFF3 3 12300 9 0.35 975 65 6.4
SFF5 5 7600 34 0.34 600 78 5.47
SFF7 7 5045 57 0.27 600 72 6.47
SFF10 10 3700 100 0.32 600 77 7.56
SFF15 15 2470 175 0.37 600 80 7.92
SFF20 20 1850 255 0.49 750 81 12.44
SFF25 25 1480 320 0.61 1050 79 19.38
SFF30 30 1235 455 0.63 1050 79 23.07
SFF40 40 925 580 0.66 1200 77 25.96
SFF60 60 630 1000 0.7 750 87 33.97

Features:

  • High Porosity: Sintered metal fiber felt has a high porosity, typically ranging from 70% to 95%. This allows for efficient filtration and fluid distribution with minimal pressure drop.
  • Interconnected Pores: The sintering process creates a three-dimensional network of interconnected pores. This interconnected structure enhances the flow of fluids and gases through the material.
  • Uniform Pore Size Distribution: The manufacturing process ensures a uniform distribution of pore sizes throughout the material, providing consistent performance and filtration efficiency.
  • Wide Temperature Range: Sintered metal fiber felt can withstand a wide range of temperatures, depending on the materials used in its construction. Some variants can operate in extremely high-temperature environments.
  • Chemical Compatibility: The choice of metal fibers allows for excellent chemical compatibility, making sintered metal fiber felts suitable for use with a variety of corrosive substances.
  • High Filtration Efficiency: The small and uniform pore size of the material allows it to effectively capture and retain solid particles, making it a reliable filtration medium.
  • Mechanical Strength: Despite its high porosity, sintered metal fiber felt retains good mechanical strength, enabling it to withstand high pressures and mechanical stresses.

Uses:

  • Filtration: Sintered metal fiber felt is widely used as a filter medium in various applications, such as oil and gas filtration, air and gas purification, and liquid filtration in chemical processing and pharmaceutical industries.
  • Catalysis: The high surface area and porous structure of sintered metal fiber felt make it suitable for catalytic applications, such as in chemical reactors or exhaust gas treatment systems.
  • Heat and Mass Transfer: Due to its high porosity and interconnected pores, sintered metal fiber felt is used in heat exchangers, where it facilitates efficient heat and mass transfer between fluids.
  • Fluid Distribution: The uniform distribution of pores allows for even fluid distribution in various applications, including fuel cells and flow distributors in industrial processes.
  • Sound and Vibration Dampening: Sintered metal fiber felt can be used to dampen sound and vibrations in specific applications, such as in automotive or aerospace industries.
  • Battery Technology: In some advanced battery designs, sintered metal fiber felt can be utilized as a current collector and separator, enhancing battery performance.
  • High-Temperature Applications: Sintered metal fiber felt is employed in industries that require filtration, separation, or fluid management in extreme temperature environments.

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