Metal 3D printing adhesive spraying process

Metal 3D printing adhesive spraying process

Common processes: MJF (multi jet fusion), npj (nano particle jet)


Description: this technique uses inkjet to selectively drop an adhesive onto a flat powder bed. The area receiving the droplets will be solidified and the remaining powder will remain loose. Perform the above steps layer by layer until the entire object is generated. This process can be used to treat metals, sand, ceramics and other materials. Since the metal adhesive sprayer operates at room temperature, it will not warp and does not need support. Therefore, the adhesive ejector can be much larger than the powder bed fusion machine, and can stack objects and make full use of the whole construction room. It is a popular choice for small batch production and on-demand manufacturing.


Technical advantage: it can print in large volume, and the parts do not need to be connected to the construction board, so it can be nested to take advantage of all available construction volumes. There are few restrictions on geometry and usually no support is required. Warpage does not occur, so larger parts can be made. The printing speed is very fast and the printing cost is lower than that of powder bed molten metal.


Technical disadvantages: after printing, the parts must go through the time-consuming degreasing and furnace sintering process, and the cost of machine and materials is high. The porosity is higher than that of powder bed fusion, so the mechanical properties are not so good, and there are few optional materials.