Oct 28, 2023

Sintered metallic filters


Sintered porous metallic filters and components are sintered stainless steel or bronze parts with high porosity (between 25% and 60% by volume).

They are produced by the powder metallurgy technology, which consists of shaping a mixture of metal powders in a mould or tool that has the negative shape of the part and then sintering the resulting preform. The preform may be created by gravity filling, by uniaxial or isostatic pressing or by extrusion, depending on the material to be shaped, the desired porosity and the component geometry.

Sintering consists in heating the preform to a temperature lower than the melting point of the base metal (between 700ºC and 1300ºC) under carefully controlled conditions of atmosphere and time. The temperature causes the powder particles to weld together.
The result of this process is a structurally functional metallic part with a controlled microporosity level.

Our sintered porous tubes are made of 316L stainless steel. They are made by isostatic compaction of powder in a flexible mould with the negative shape of the part, and then sintered. The pore size is adjusted by changing the compaction pressure and/or the particle size of the powder.

These filters are commonly used for dead-end microfiltration of gases at high temperature or pressure and of liquids in a cross-flow filtration regime. Connections of different geometries are often incorporated at the ends ( as BSP or NPT standards or to customer specifications ).