Porous Metal Filter

A porous metal filter is a type of filtration device made from metal materials with interconnected pores or channels that allow the passage of fluids while retaining particles and contaminants. These filters are commonly used in various industries and applications where high-temperature resistance, chemical compatibility, and durability are essential.

Types of Porous Metal Filter

  • Sintered Metal Powder Filters: These filters are created by compacting metal powders and sintering them at high temperatures to form a rigid structure with interconnected pores.
  • Sintered metal mesh filters: Made by sintering multiple layers of metal meshes with varying porosities, resulting in a robust and versatile filtration structure. The stacked layers of mesh create a tortuous path for fluids, effectively trapping particles while allowing the fluid to pass through.
  • Metal Fiber Filters: Constructed from fine metal fibers, these filters offer high porosity and are suitable for applications requiring fine filtration.
  • Metal Foam Filters: Made from metallic foams with open-cell structures, these filters offer unique advantages like low pressure drop and high flow rates.

Materials Used

  • Stainless Steel: Offers excellent corrosion resistance and mechanical strength.
  • Bronze: Provides good chemical resistance and is often used for applications involving harsh environments.
  • Nickel: Known for its high-temperature resistance and resistance to many corrosive substances.
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Filter Fineness / Filter Rating

Different porous metal filters have different filter ratings, which are chosen based on the intended application and the size of particles that need to be removed from the fluid or gas being filtered. Lower filter ratings indicate finer filtration, as the filter can capture smaller particles, while higher filter ratings mean coarser filtration, allowing larger particles to pass through the filter.

The filter rating is often specified as an “absolute” or “nominal” rating:

  • Absolute Filter Rating: This indicates the largest size particle that the filter will capture with high efficiency. For example, a filter with an absolute rating of 5 μm will capture at least 99.9% of particles that are 5 micrometers or larger.
  • Nominal Filter Rating: This is a more general rating and indicates the approximate particle size range the filter can capture. However, it does not guarantee a specific efficiency level. For example, a filter with a nominal rating of 20 μm might capture a range of particles, including some larger and smaller than 20 μm, but its efficiency for particles of exactly 20 μm is not specified.

The choice of filter rating depends on the application requirements. For critical applications where very fine filtration is necessary, filters with absolute ratings are preferred. In other cases where a general level of filtration is sufficient, nominal ratings may be suitable.

When selecting a porous metal filter, it’s important to consider the filter rating in conjunction with other factors such as porosity, permeability, and material compatibility to ensure the filter meets the specific needs of the intended application. Manufacturers or suppliers of porous metal filters can provide detailed information about the filter ratings available for their products.

Features:

  • High-temperature resistance.
  • Chemical compatibility with a wide range of substances.
  • Excellent mechanical strength and durability.
  • Can be easily cleaned and reused in some applications.
  • Low pressure drop for efficient fluid flow.

Uses/Application

Sintered porous filters find applications in various industries, including:

  • Oil and gas filtration: Including well completion, hydraulic fracturing, and produced water treatment.
  • Aerospace: Hydraulic systems and engine filtration in aircraft.
  • Chemical processing: Filtration of corrosive chemicals and catalyst recovery.
  • Water treatment: Filtration in wastewater treatment and water purification processes.
  • Pharmaceutical: Filtration of gases and liquids in pharmaceutical manufacturing.

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