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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

  • Effects of the Nozzle Tip Clogging and the Scanning Direction on the Deposition Process During Laser Metal Deposition of Alloy 718 Using a Four-Stream Discrete Nozzle

    摘要： Depending on the configuration of the LMD system, the nozzle tilting is necessary to be able to manufacture parts with complex geometry. In these cases, the use of discrete coaxial nozzles is recommended. With this type of nozzle, the powder can clog the internal tips of the nozzle streams due to an inappropriate shape, size distribution, humidity or temperature conditions of the powder particles during the deposition process. This undesired effect can be an opportunity depending on the combination of the activated powder tips for coating complex surfaces when the geometry of the substrate acts as a barrier for the powder stream. This work presents for first time the effect of the scanning direction and the stream clogging on the deposition process in terms of powder efficiency, Material Deposition Rate (MDR) and clad geometry and dimensions, when Alloy 718 is deposited by LMD using a four-stream discrete coaxial nozzle.

    关键词： Alloy 718,coatings,Laser metal deposition,geometrical characteristics,stream clogging,discrete nozzle

    更新于2025-09-23 15:21:01

  • Design and optimization of discrete powder nozzle for laser metal deposition

    摘要： For design and optimization of discrete powder nozzle for laser metal deposition the experimental research was completed. Influence of powder jet geometry, of powder streams interaction and influence of shield gas at powder efficiency was investigated. The prototype of discrete powder nozzle was designed. Experimentally defined, that powder jet with inner diameter 1.4 mm and length 60 mm provide the highest powder efficiency for discrete powder nozzle. Interaction of gas-powder streams causes a decrease of powder efficiency. Shield gas using doesn’t affect powder efficiency of discrete powder nozzle.

    关键词： laser metal deposition,powder efficiency,interaction of powder stream,coaxial discrete nozzle,powder nozzles,Additive manufacturing

    更新于2025-09-16 10:30:52