Powder metallurgy involves several techniques : metal injection molding (MIM), hot isostatic pressing (HIP), additive manufacturing, etc.
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SINTERMAT industrializes a new and innovative powder metallurgy process : Spark Plasma Sintering (SPS), also known as FAST sintering or flash sintering.
Spark Plasma Sintering involves agglomerating powders under the simultaneous effect of a strong electrical pulse and uniaxial loading, thereby obtaining high strength and high-density parts.
Through this process, the densification of powders and materials can generally be achieved 10 to 100 times faster than by conventional sintering techniques.
It enables the synthesis of solid, innovative, original and controlled microstructure materials at moderate cost.
It is one of the only technologies capable of producing materials with microstructures without enlarging the grain and with a densification rate close to 100%.
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Feb 4,
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Did you know that ceramic materials need to be put into a furnace for heating when they are produced? We refer to this process as sintering. After sintering, the ceramic material will have a firm shape and a fine surface. The sintering process plays an important role in the manufacture of metals, ceramics and nanomaterials. HAOYUE shares with you the working process, advantages and applications of spark plasma sintering (SPS).
Sintering: The process whereby powdered material after pressing and forming is gradually transformed into a material with a certain geometry and strength by mutual bonding of particles between blanks and material transfer, resulting in the exclusion of pores, volume shrinkage and strength increase under the action of high temperatures below the melting point. The purpose of sintering is to transform the powdered material into a dense body and to give the material its characteristic properties.
Rapid Heating S4 Spark Plasma Sintering Furnace
Spark plasma sintering (SPS) is a sintering technique where materials are compressed and compressed to a higher density. Systems designed for spark plasma sintering use direct current pulses to generate spark energy between particles of material. The technology enables particle and, unlike other sintering processes that involve only metal processing, spark plasma sintering can be applied to ceramics, composites and nanostructures.
SPS furnance offers the possibility of manufacturing very special new materials, such as nanomaterials, functional gradient materials, composites, tungsten carbide or other hard materials, without significant grain growth.
The process is based on the principle of electric spark discharge, in which a high-energy pulsed current produces a spark plasma between the particles in the material. This spark plasma exists at an extremely high temperature of 10,000°C (°F), causing potential oxidation or evaporation of contaminants from the surface of the particles. The particle surfaces are also heated, causing these areas to melt and fuse together to form structures called necks. Over time, the necks develop into spaces, in some cases increasing the total solid density of the material to over 99%.
Advantages of the spark plasma sintering process include short completion times, low operating costs, a wide range of applications, and good structural and material results. Due to the nature of the process, spark plasma sintering typically takes less than 20 minutes to complete.
The cost of the technique is also typically low because the pulsating current does not require high voltages and the process does not take a long time to complete. This short cycle time, combined with the low cost, makes the process versatile.
Spark plasma sintering produces higher densities than many other sintering processes, which makes it ideal for materials requiring high solid densities. The process can be used for both insulators and conductors, opening up a wider range of materials that can be sintered.
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