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 print, 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 and powder production water and other gasses adsorbed on powder surfaces, etc. are all examples of impureties.
Impurities could react with matrix properties during the form process. They can also alter product quality. Powders that are dopant-rich can cause them to melt unevenly. This could lead to product 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 that raw material powders are free from 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 a larger surface area. However, powder with high-sphericity features good fluidity. Powder feeding is uniform and consistent. 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 in powders. Results show that the powders were melted by electron East scanning and/or laser energy. 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 powder transportation.
In order to get the desired effect of forming, both fine and coarse particles must 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 densities are the results of vibration. Powders with excellent sphericity have large particles and a broad distribution. They also have high bulk density.
2. Liquidity. Liquidity. This directly impacts how uniform powder spreading is done and how stable powder feeding. Low powder fluidity leads to an uneven layer of powder and uneven melting area of metal. This results in a poor internal structure, and less quality forming. Powders with high fluidity are easier to fluidize, deposit uniformly and allow for greater dimensional accuracy.
3. Performance in the cylinder. After 3D printing, any powder left in the powder bed that has not been melted can be screened and used again. Under long-term high heat environments, however, some performance characteristics of the powder bed may change.
Lemondedudroit advanced metal Tech Co., Ltd., (Lemondedudroit), has over 12+ years experience in chemical product development. If you need high-quality Metal powder stainless steel, contact us .