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Metal & Ceramic Science

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Metal powders, metal oxides and the precursors ceramics are made from. Chemistry is the easy part of this specification: two lots of identical assay and identical mean particle size can sinter differently, flow differently and pack differently, because what governs behaviour is the distribution and the particle shape rather than the average.

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Specifying it

What decides the purchase

The compound is usually fixed by the route. These are the things that vary between suppliers and between lots.

  1. Distribution, not mean particle size

    A d50 alone describes very little. Two powders with the same d50 and different spans behave differently in packing density, sintering shrinkage and flow. Ask for d10, d50 and d90 with the measurement method — laser diffraction and sieve analysis do not give the same numbers, and comparing across methods is comparing different quantities.

  2. Surface oxide is present whether or not it is specified

    Most metal powders carry an oxide layer, and on fine powders that layer is a significant fraction of the mass. It changes the effective metal content, the sintering behaviour and the reactivity. Oxygen content is the figure that captures it, and it belongs on the certificate for anything below a few microns.

  3. Morphology governs flow and packing

    Spherical, flake and irregular powders of the same composition and size distribution behave very differently: spherical powders flow and pack predictably, flake powders bridge and interlock. For additive manufacturing, pressing or any metered feed, morphology is a functional specification rather than a description.

  4. Fine metal powders are a hazard class of their own

    Several fine metal powders are pyrophoric or form explosible dust clouds, which constrains shipping, storage and how the material can be handled on site. Aluminium, magnesium, titanium and zirconium powders all fall into this territory at fine particle sizes. Establish the receiving site's capability before the order, not on arrival.

Questions

Why does particle size distribution matter more than the average?
Because behaviour is driven by the extremes as much as by the middle. Fines dominate surface area and therefore reactivity and sintering rate; coarse particles control packing and can leave voids. Two powders with the same d50 and different distribution widths sinter to different densities and flow differently through a hopper. The d10 and d90 are what describe that, and the method has to be stated because different techniques give different values.
How is purity quoted for a metal powder?
Usually as metals-basis purity, which excludes gases and non-metallic elements — so a powder quoted at 99.9% metals basis may still carry appreciable oxygen as surface oxide. For fine powders that distinction is significant, because the oxide can be a meaningful fraction of the mass. Ask for the oxygen content alongside the metals-basis figure rather than assuming the purity covers it.
What handling constraints come with fine metal powders?
At fine particle sizes many metals become pyrophoric or capable of forming an explosible dust cloud, which brings transport classification, inert-atmosphere storage and controlled handling into scope. Some ship wetted or under argon for this reason. The practical consequence is that the receiving site's capability should be confirmed before ordering, because a consignment that cannot be safely accepted is worse than a delayed one.