3D Printing Powder: What Is It and How Is It Used?

3D printing, the commercial term commonly used for additive manufacturing (AM), was first mentioned by Murray Leinster in the 1940s. Although 3D printing still represents less than 1% of the global manufacturing market, its advantages over traditional manufacturing have helped the market nearly double in size every three years. The global 3D printing market was expected to grow at an annual rate of 20.8% from 2022 to 2030 [1]. With broad applications in healthcare, automotive, aerospace, and other industries, 3D printing is widely regarded as one of the most promising manufacturing methods for the future.

3D printing is generally divided into seven categories: Vat Photopolymerization, Material Jetting, Material Extrusion, Binder Jetting, Powder Bed Fusion, Sheet Lamination, and Directed Energy Deposition. The last four categories use 3D printing powder as feedstock.

What Is 3D Printing Powder?

3D printing powder refers to powder materials used as feedstock in 3D printing. These powders are typically made from metals, alloys, ceramics, or polymers.

Based on particle shape, 3D printing powder can be divided into two main groups: spherical powder and irregular powder. Spherical powder generally provides better flowability, allowing it to spread more evenly and form more homogeneous layers. This can contribute to stronger printed components. The trade-off is cost: spherical 3D printing powder is usually more expensive than irregular powder.

How Is 3D Printing Powder Produced?

Most 3D printing powders are produced through atomization. Common atomization routes include water atomization and gas atomization, while specialized methods such as electrode induction melting gas atomization (EIGA) and plasma atomization (PA) are also used for specific materials and powder requirements.

Water Atomization (WA)

Water atomization begins by melting the feedstock alloy or metal in a furnace; the feedstock can be supplied in almost any shape. The molten material is held long enough to ensure a homogeneous melt, then transferred into a crucible fitted with a refractory nozzle that controls the flow rate. When the nozzle is opened, the molten stream enters the atomization chamber, falls freely, and is cooled, atomized, and consolidated by high-speed water jets. The resulting powder is collected at the bottom of the chamber and must then be dried.

Powder produced by water atomization is usually irregular in shape and is generally not used for 3D printing.

Gas Atomization (GA)

Gas atomization follows a process similar to water atomization, but the atomization medium is different. Instead of high-speed water, the process uses a high-pressure gas stream, usually an inert gas, to break the molten metal into droplets. Because gas has a lower specific heat capacity than water, the droplets take longer to cool and consolidate. This slower solidification helps produce powder with a more spherical shape.

The particle diameter produced by gas atomization can be difficult to control precisely and may range from 0 to 500 μm. Even when inert gas is used throughout the atomization process, contamination can still occur during transfer of the molten metal from the furnace to the crucible or during other handling steps.

Electrode Induction Melting Gas Atomization (EIGA)

Electrode induction melting gas atomization (EIGA) was developed from conventional gas atomization. Instead of melting metal in a crucible, EIGA uses rotating metal rods as feedstock. The rods are melted by induction heating, and the molten metal can fall directly into the atomization chamber, reducing contact with crucible materials.

EIGA can produce powder within a narrower and smaller particle-size range. It has gradually become a major method for producing active alloy powders such as Ti-6Al-4V.

Plasma Atomization (PA)

Plasma atomization (PA) uses plasma as the heat source to melt feedstock supplied in powder or wire form. When the feedstock reaches the plasma, it is melted and atomized at the same time by inert-gas jets. The downstream collection steps are similar to those used in gas atomization.

Plasma atomization can produce powders with higher sphericity and smaller particle sizes.

Table 1. Characteristic Summary for Atomization

How Is 3D Printing Powder Used?

3D printing powder is mainly used in powder-bed-based 3D printing technologies such as powder bed fusion and binder jetting. The core principle of these processes is to build a component layer by layer from powder. This layer-by-layer approach makes it possible to manufacture more complex and customized products than many traditional manufacturing technologies.

In powder bed fusion, a roller or recoater takes powder from the delivery system—typically spherical metal or polymer powder, such as spherical titanium powder—and spreads it into a thin, even layer across the base plate. A laser beam then selectively fuses the powder. After one layer is completed, the build platform moves downward by the distance of one layer while the powder delivery system moves upward by the same distance. The recoating and fusion steps are repeated until the part is complete. This process is known as powder bed fusion.

Another technology uses a binder to join the powder particles together. The other process steps are broadly similar to powder bed fusion. This method is called binder jetting.

Because powder serves as the feedstock that must spread across the plate to form a thin layer, its characteristics strongly influence the toughness, detail, and consistency of the printed component. Irregular powder does not form homogeneous, high-density, low-porosity layers as effectively, which can result in lower-density parts and may even contribute to printing failures. Spherical powder generally performs better, but it is also more expensive.

Smaller particles can be used to create thinner layers. This means more powder is consumed to build a layer of the same overall thickness, but the resulting layer can be finer and more delicate than one produced with larger particles. Extra care is required when using powder smaller than 20 μm because it can cake easily and form an uneven layer. Special processing technologies are required for powders in this size range.

FAQs: 3D Printing Powders

Q1: What are the most common 3D printing powders?

The most common types include titanium alloys (for example, Ti6Al4V), stainless steel (such as 316L), aluminum alloys (such as AlSi10Mg), nickel-based superalloys (including Inconel 718 and 625), and cobalt-chrome.

Q2: Why is powder shape so important in additive manufacturing?

Powder shape directly affects flowability and packing density. Spherical powders flow more smoothly and pack more densely, helping create more uniform layers, higher part density, and better final mechanical properties than irregular powders.

Q3: What does powder flowability mean?

Flowability describes how easily a powder spreads into a thin, consistent layer during printing. Good flowability reduces the risk of voids, defects, and failed prints.

Q4: How is the particle size distribution (PSD) selected?

PSD is selected according to the printing technology. Fine powders in the 15-45 μm range are typical for Laser Powder Bed Fusion (LPBF), where high-resolution detail is important. Coarser powders in the 45-100 μm range are often used for Direct Energy Deposition (DED) or Binder Jetting.

Q5: Can 3D printing metal powder be reused?

Yes. Unused powder is often sieved and blended with fresh powder for reuse. However, repeated reuse can cause oxidation and changes in particle size distribution, so the powder must be monitored to confirm that it continues to meet the required specifications.

Q6: What is the main difference between water- and gas-atomized metal powder?

Gas atomization typically produces more spherical powder with lower oxygen content, making it ideal for LPBF and EBM processes. Water atomization produces more irregular powder, which is often used in processes such as Binder Jetting or Metal Injection Molding (MIM).

JINGYE 3D Printing Metal Powder Products

For additive manufacturing projects that require controlled particle size, stable powder flow, and consistent alloy chemistry, JINGYE supplies industrial metal powders for 3D printing and related manufacturing processes. The company’s additive manufacturing portfolio includes stainless steels, mold steels, Invar alloys, and nickel-based high-temperature alloys.

JINGYE manufacturing and quality capabilities:

24 metal powder production lines, including 17 ultra-high-pressure water-gas co-atomization lines, 4 gas atomization lines, and 3 titanium-alloy powder production lines.

Annual metal powder production capacity of 10,000 metric tons and a customer base of more than 300 companies.

Control and testing of alloy chemistry, particle size distribution, morphology, oxygen/nitrogen/hydrogen content, flowability, apparent density, and tap density as applicable.

Support for additive manufacturing, MIM, laser cladding, and soft magnetic powder applications, including standard grades and customized powder specifications.

Explore JINGYE’s complete metal powder portfolio: https://www.jingyepowder.com/products/

Browse 3D printing powders: https://www.jingyepowder.com/3d-printing-powder/

For material selection, particle-size requirements, or a custom powder specification, contact JINGYE with your target alloy, printing process, equipment model, required particle size, estimated volume, and applicable material standard.