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Industrial powder technology: complete guide

Industrial Powder Technology

Powder technology covers all processes for the production and processing of fine solids. From pharmaceutical APIs to metallurgical powders — each powder requires specific production, characterisation and processing technology.

Key points

The production method (milling, precipitation, spray drying, atomisation) determines the morphology and processability of the final powder
Compaction (pressing) forms loose powder particles into a green compact; sintering heats it below the melting point into a dense, cohesive product
Pharmaceutical, ceramic and metallurgical applications each place different demands on purity, particle shape and compressibility
Flowability (Carr index, Hausner ratio) determines whether a powder flows through hoppers and dosing equipment without bridging

Powder production methods

Powder is produced via milling (top-down), precipitation, spray drying, atomisation or chemical precipitation. Each method yields a specific particle size distribution, morphology and surface chemistry that determine processability and final product properties.

Characterisation of industrial powders

Critical characterisation parameters: PSD (laser diffraction), BET surface area, bulk density, tapped density and flowability (Carr index, Hausner ratio). Hecht Technology is a specialist in powder bulk handling: hecht-technology.nl.

Compaction and sintering

In powder metallurgy and technical ceramics, powder is first compacted (uniaxial or isostatic pressing) into a "green compact" with sufficient mechanical strength to handle, but still porous. Sintering then heats this green compact below the melting temperature, causing particles to bond together (diffusion) and the part to shrink into a dense, cohesive structure. The consistency of the powder characteristics before pressing — particle size, shape, flowability — directly determines the density and dimensional stability of the final product after sintering.

Applications by industry

In the pharmaceutical industry, powder characterisation directly determines the tabletability and dose uniformity of APIs. In technical ceramics, it determines the sintered density of final products such as insulators and cutting tools. In metallurgy (powder metallurgy, PM), precision characterisation makes it possible to produce near-net-shape parts with minimal post-processing.

FAQ — Industrial powder technology

What is the difference between compaction and sintering?

Compaction is the mechanical pressing of powder into a shape-stable green compact. Sintering is a thermal process in which this green compact is heated below the melting point, causing particles to bond through diffusion and the product to gain its final density and strength.

Which powder property is most decisive for compressibility?

Particle shape and size distribution are generally most decisive: irregularly shaped particles interlock mechanically and give higher green strength than spherical particles, which flow better but compress less well without a binder.