Study of metallic powder flow in discrete coaxial nozzles

• Published in: Journal of physics. Conference series Vol. 1109; no. 1; pp. 12008 - 12016
• Main Authors: Stankevich, S L, Topalov, I K, Golovin, P A, Valdaytseva, E A
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.11.2018
• Subjects: Carrier gases; Coaxial nozzles; Flow distribution; Flow stability; Laser deposition; Metal powders; Parameters
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1109/1/012008

Additive technologies are gradually introducing into modern manufacturing, complementing or dislodging conventional material processing technologies. This is because of they have a unique advantage in the manufacture of products. Currently, among the popular additive laser technologies the most promising and productive technology is the direct laser deposition (DLD). The distribution of powder particles in a gas-powder flow is an important parameter that determines the powder capture coefficient (PCC) and, as a consequence, the efficiency of the DLD process. The powder flow distribution depends on the shape of the particles, the stability and the parameters of supply of the carrier gas and powder. When above conditions are fulfilled, gas-powder flow becomes stationary, which allows to determine PCC. The measurements of the PCC for different amounts and cases of nozzle positions were conducted. Having analysed the experimental and calculated results we can conclude that the model of the powder stream satisfactory describes one tube nozzle.