The Features Of Stainless Steel Sintered Felt - Industry News - News ...

• Application range of stainless steel sintered felt

  Dashang are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

Stainless steel sintered felt can be used for catalyst recovery. The filter made of sintered felt is small in size, long in service life and low in pressure difference, so it is widely used in various petrochemical processing fields and has important value in waste pickling solution. The catalyst has a recycling effect.

Stainless steel sintered felt can also be used for filtration of hydraulic systems: sintered felt can be used for any high, low and medium pressure filters, so it is widely used in various aviation, marine, aerospace, machine tool, metallurgical, pharmaceutical and chemical industries. In China, most of the hydraulic systems of civil aircraft are filter materials made of sintered felt.

Stainless steel sintered felts can also be used for tight filtration in the semiconductor industry: in the semiconductor industry, various high-density processors and memory chips are used to process air cleaning gases. Filters made from filters are more effective and easier to use.

The comparative advantages of stainless steel sintered mesh filter element and stainless steel sintered felt filter element

First, you need to learn more about the features of various brands and models of water purifiers. Any type of water purifier has its pros and cons, and different filters work differently. You also need to know the water quality of the daily tap water in the city, and then buy it according to your own meals and eating habits. The best choice is for your talents.

At this stage, there are various types of household water purifiers in various types of well-known brands. There are many filters, single core ultrafilters, ultrafilters that can be used without electricity, and reverse osmosis equipment filters that require a propulsion to be used safely. There are also many export trades with ultrapure water export trades. There is clean water export trade and more. Pure water can be drunk directly, but there are no nutrients, only to continue to supplement the water content. Purification of water requires boiling after drinking, especially for cooking and washing food in the kitchen. In addition, the need to use electricity to use reverse osmosis water purifiers will also produce wastewater, especially in winter, the wastewater rate is as high as about 70%, and reverse osmosis water purifiers filter out harmful and beneficial substances in the water.

The service life of multi-filter elements is also very different. For example, the service life of PP cotton filter element is only 3≤6 months, the service life of activated carbon filter element is 6≤12 months, and the service life of ultrafiltration or reverse osmosis filter element is generally 24 months. months or so. If changing filters on a schedule is too much of a hassle, there is no need to buy a long-life water purifier that doesn't require frequent replacement, and if the local water quality is good, there is no need to buy a water purifier. If the local water quality is too poor and the quality of drinking water is problematic, you can consider purchasing a reverse osmosis water purifier, also known as a pure water machine. Now the manufacturer has also introduced some water outlet water purifiers, which have pure water outlets, which can be drunk directly, and a clean water outlet, which is suitable for boiling water for cooking.

Also purchase a pre-filter to install the water purifier to extend the life of the water purifier filter. Fit 3M, buy by size. It's more expensive, but the quality is there.

The function of adding sintering agent in the production of sintered felt polyester melt filter element

1. Strengthen the pelletizing and granulation, improve the air permeability of the material layer, increase the vertical sintering speed and the utilization factor of the sintering machine.

2. Improve the reactivity and combustion efficiency of sintered fuel, and reduce the consumption of FeO and solid fuel.

3. Enhance the oxidizing atmosphere of the combustion zone and promote the low temperature sintering of the thick material layer.

4. Increase the content of calcium ferrite in the binder phase, improve the metallurgical properties of the sinter, and promote the increase of iron and coke in the blast furnace.

5. Reduce the amount of SO2 generated in the sintering waste gas and reduce environmental pollution.

Influence of sintering temperature on fiber sintered felt

The sintering process is a key process that affects the microstructure of the metal fiber sintered felt, and the sintering temperature is the most important parameter of the metal fiber sintered felt process. This paper takes the 6 μm fiber felt as an example for analysis. The 6 μm fiber mat has obvious sintering necks at these three temperatures, but the fiber sintered mat exhibits three different morphologies at the three temperatures. a is the sintering neck formed by 6 μm fibers after sintering at 1 200 ℃, the upper and lower vertical fibers form a sintering neck at the tangent, and the diameter of the sintered felt is larger than the fiber diameter, but the two fibers have no tendency to fuse; when sintered When the temperature is 1 250 ℃, the diameter of the sintered felt of the two vertical fibers is larger than that at 1 200 ℃, and the fibers near the sintered felt tend to fuse, which reflects that the new grain boundary formed at the sintered felt diffuses through the grain boundary at the same time. The two fibers are pushed up and down, and the diameter of the fibers near the sintered felt shrinks. This may be because with the increase of the sintering temperature, the metal atoms diffuse to the sintered felt along the length of the fiber, resulting in the shrinkage of the fiber diameter, while 1 200 The fiber sintered felt at ℃ does not have this phenomenon; when the sintering temperature is 1 300 ℃, the fibers near the sintered felt have obvious fusion, which is because the sintering temperature continues to increase, the grain boundary diffusion is faster, and the substances in the fibers near the sintered felt diffuse. At this time, the fibers at the sintered felt also shrunk significantly, and the 6 μm fiber felt did not melt at 1 300 ℃.

The welding of the lap joints of the fiber sintered felt is carried out by diffusion. In the early stage of sintering, the overlapping points of the fibers in contact with each other gradually form the connection of the sintered felt. At this time, the overlapping points are discontinuous and have a large number of pores. The main mechanism of diffusion is surface diffusion; Grain boundaries are gradually formed in the sintered felt, and the main diffusion mechanism at this time is grain boundary diffusion; in the later stage of sintering, the grains near the sintered felt begin to grow, and the bulk diffusion of grain growth is the main mechanism at this time. The essence of diffusion is the thermal motion of atoms, and temperature significantly affects the rate of atomic diffusion. For surface diffusion, sintered felt can only be formed when the sintering temperature is sufficient for the thermal motion of atoms on the fiber surface to overcome the surface energy barrier, so fiber sintered felt. should exceed a certain temperature. Similarly, the sintering temperature affects the diffusion speed of fiber atomic grain boundaries. The higher the sintering temperature, the faster the grain boundary diffusion speed and the faster the fiber sintering felt; but too high sintering temperature will cause the fiber to have too large grains and shrinkage of the wire diameter. And defects such as over-melting, which need to be avoided in the fiber sintered felt process.

• Influence of fiber diameter on fiber sintered felt

When the sintering temperature is constant, the fiber diameter has a great influence on the morphology of the fiber lap joint. This paper takes 1 250 ℃ as an example to analyze. It can be seen from the above analysis that at 1 250 ℃, the 4 μm fibers are completely fused together at the sintering neck, the 6 μm fibers are partially fused at the sintering neck, and the 8 μm fibers are not fused at the sintering neck and the diameter of the sintering neck is larger than the fiber diameter. , 12 μm fiber sintering neck diameter is smaller than the fiber wire diameter, 22 μm fiber mat sintering neck diameter is smaller, and it is not easy to find the sintering neck in electron microscope detection, only in some special positions of the fiber. In addition, under the same conditions, the finer the fiber diameter, the faster the sintering speed.

The influence of the fiber diameter on the fiber sintered felt mainly has the following two aspects: 1) The smaller the fiber diameter, the larger the specific surface area of the fiber, the lower the surface energy barrier of the atoms on the fiber surface, and the reduction of the atomic diffusion distance, under the same conditions The lower filament diameter fiber takes the lead in surface diffusion and completes the 3 processes of sintering, while the sintering speed of the coarse diameter fiber is slower, and even the surface diffusion of the fiber lap joint has not been completed; 2) Due to the special production process of metal fibers, fine The metal fiber with the wire diameter stores more deformation energy. When the sintering enters the middle and late stage, grain boundary diffusion and bulk diffusion mainly occur. At this time, the deformation energy will act as the driving force for sintering to increase the speed of grain boundary diffusion and bulk diffusion. The wire diameter is For the 4 and 6 μm fiber mats, the fibers began to shrink near the sintering neck due to atomic diffusion along the long direction.

Metal fiber sintered felt is used as a filter material. Before sintering, its fibers are randomly arranged and in contact with each other. At this time, the fiber sintered felt is not a whole, and a certain pore structure cannot be maintained between the fibers; after sintering, the fiber sintered felt Has a certain strength and structure. Diffusion welding of fiber lap joints has a great influence on the properties of fiber sintered mats. If the fibers are over-melted, the average pore size of fiber mats will be affected, and even leakage points will appear. The state of the sintered fiber felt will affect the toughness and strength of the sintered fiber felt, and the grain size of the sintered fiber felt will affect the corrosion resistance of the sintered fiber felt.

Stainless steel fiber sintered felt is a high-performance filtration medium composed of randomly laid stainless steel fibers that are sintered (fused) together in a high-temperature vacuum furnace. This process forms a porous, three-dimensional network structure that offers excellent filtration properties.

In the petroleum industry, where harsh conditions, high pressures, corrosive fluids, and fine particle contaminants are common, stainless steel fiber sintered felt provides significant advantages over traditional filtration materials like woven wire mesh or paper filters. Below are the key benefits of using stainless steel fiber sintered felt in petroleum applications:

High Filtration Efficiency and Precision

One of the most notable advantages is its excellent filtration accuracy. Stainless steel fiber sintered felt is capable of filtering particles as small as 3–30 microns with high efficiency. Its gradient pore structure, typically designed with multiple layers of varying pore sizes, enables depth filtration, which means particles are trapped throughout the media's thickness rather than just on the surface. This leads to:

Higher dirt-holding capacity

Longer service life

Lower risk of clogging

This is particularly important in the petroleum industry, where fluids often contain suspended particles like sand, rust, scale, and chemical residues that can damage sensitive equipment.

Outstanding Thermal and Chemical Resistance

For more information, please visit dutch weave wire mesh.

Petroleum refining and extraction processes often involve extremely high temperatures and exposure to corrosive chemicals such as hydrogen sulfide, hydrocarbons, and acids. Stainless steel fiber sintered felt, typically made from 316L or 304 stainless steel, can withstand:

Temperatures up to 600°C (°F)

High-pressure differentials

Strong acids and bases

This makes it suitable for use in harsh environments like:

Oil drilling mud filtration

Catalyst recovery

Refining processes involving hydrocrackers or desulfurization units

Its chemical and thermal stability ensures durability and minimal degradation, which reduces maintenance frequency and operational downtime.

Mechanical Strength and Durability

Unlike paper or polymer filters, stainless steel sintered felt offers superior mechanical strength due to its sintered construction and metallic composition. It is resistant to:

Collapse under high pressure

Deformation under high flow rates

Abrasion from hard particles

This durability makes it ideal for deep well filtration, subsurface pumping systems, and high-flow refinery applications, where filter integrity is crucial for safety and operational efficiency.

Backwashability and Reusability

One of the major operational advantages is the ability to clean and reuse the filter multiple times. The open, three-dimensional fiber structure allows for:

Backflushing to remove accumulated debris

Ultrasonic cleaning for finer particles

Thermal or chemical regeneration for extreme fouling

Reusability significantly reduces the lifetime operating costs and minimizes waste generation, aligning with environmental sustainability goals and lowering the total cost of ownership.

Customizability and Design Flexibility

Stainless steel fiber sintered felt can be fabricated into a wide range of shapes and sizes:

Cartridges

Discs

Tubes

Pleated elements

It can be engineered with multi-layer structures tailored to specific applications, allowing for precise control over pressure drop, flow rate, and filtration efficiency. This makes it a versatile solution for the petroleum industry's upstream, midstream, and downstream processes.

Improved Safety and Equipment Protection

Using stainless steel fiber sintered felt helps protect critical equipment like compressors, pumps, valves, and turbines from abrasive wear or fouling by ensuring that only clean fluids pass through. This reduces the likelihood of unplanned shutdowns, expensive repairs, and safety hazards associated with system failures.