3D printing makes it much less likely that traditional manufacturing techniques for material reduction to waste metal materials. Furthermore, 3D printers have the ability to directly form the product, which reduces the chances of equipment failures. For metal 3D printers, the basic material is metal powder. This basic property has a strong relationship with final product quality. It is important to consider the following requirements in metal 3D printer for powder: chemical composition, particle form, particle size and distribution, fluidity, recycling, etc.
There are two main types of chemical elements in raw materials: metal elements, and impurities. Fe, Ti. The most commonly used metal elements are N,A, Cu. Co. Cl and precious metals Ag, Au. Si, Mn.C, S.P.O. in reduced-iron, other impurities, raw materials, powder production water, gases, etc. are examples of impure substances.
Impurities in the matrix can interact with it, alter its properties and have negative consequences for product quality. Powders that contain dopants could also melt unevenly, causing internal defects. The high oxygen content in metal powders makes it easy for them to oxidize, form oxide films, and also leads to spheroidization. This can affect the product’s density and quality.
For quality products it is important to monitor all raw material powders for impurities or doping. 3D printing requires metal powders of high purity.
Particle Shape Particle Size Particle Size Distribution
1.Shape requirements. Common shapes include spherical (subspherical), flaky, needle, and other irregular forms. It is easier to increase the sintering speed if irregular particles have greater surface areas. However, powder with high-sphericity features good fluidity. Powder feeding is uniform and smooth. These characteristics are conducive for improving density and uniformity. 3D printing requires powder particles to be spherical and near-spherical.
2. The particle size distribution and the particle size distribution in powders. Results show that powders can be melted or sintered through direct absorption of energy from laser or electron East scanning. It is important to note that smaller particles have a greater surface area. This means more energy can be absorbed direct. Also, higher temperatures will facilitate sintering. Also, the particle size is smaller, there’s less space between them, so the loss of density and density are high after the forming process. All of this is good for improving product strength and appearance. Too small particles can cause powder to adhere or agglomerate. This results in a decreased powder fluidity that affects both the flow and the uniformity of the powder.
In order to obtain the desired forming effect, both fine powder and coarse should be mixed in a proportion.
Processing Power Requirements for the Powder
Technologies include powders with bulk density, compacting strength, fluidity, and the ability to recycle.
1. Loose packing densities is the natural powder density. Vibrating Density is the result of vibrating. Powders with good sphericity have high bulk and low porosity. Parts after forming are high-density and of good quality.
2. Liquidity. Liquidity. This directly affects how uniform powder spreading is or whether powder feeding can be stable. Low powder fluidity leads to uneven product thicknesses and uneven metal melting. It also affects the form quality and internal structure. A powder of high fluidity will be easy to dissolve, deposit uniformly and has high utilization rates. This can help improve the quality and dimensional accuracy as well the surface uniformity and compactness for 3D-printed parts.
3. Performance in the cylinder. The unmelted powder in the powder bed that remains after 3D printing is complete can be recovered via screening. Under long-term high heat environments, however, some performance characteristics of the powder bed may change.
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