Effect of wetting on the incorporation behavior of powder particles in laser melt injection at high processing speed

高加工速度激光熔体注射中润湿对粉末颗粒掺入行为的影响

• 批准号: 495532447
• 金额: --
• 依托单位: BIAS - Bremer Institut für Angewandte Strahltechnik GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/495532447?language=en
• 关键词: Effect; wetting; incorporation; behavior; powder

Although laser melt injection offers clear technological advantages over other processes for producing functional component surfaces, this process has not yet been widely accepted in industry due to low process speeds and the associated low productivity. Current investigations however indicate that high speed melt injection can be feasible. Moreover, at this point the process is limited to the use of metallic hard materials with good wettability, while oxide particles cannot be processed due to poor wettability. Therefore, the overall goal of the project is to better understand the process of laser melt injection at high process speeds. This understanding should enable an extension of the current process limits in terms of maximal process speed, achievable hard particle content at high process speed, and also in terms of feasibility of using oxide particles.In particular, the project aims to generate an understanding of the incorporation behavior of powder particles in the melt pool during laser melt injection. Differences between a process at low speed and a process at high speed are to be identified. The incorporation behavior of powder particles is to be correlated with the input factors wettability of the hard materials by the substrate melt, density ratio of particles and substrate melt and kinetic energy of the powder particles. Through identification of the main influencing parameters, a high speed laser melt injection process shall be developed that still allows for the incorporation of a high hard particle content. To improve the wettability of the hard materials, titanium coated hard particles shall be investigated for the first time in laser melt injection. In particular, this should enable the use of oxidic hard materials in laser melt injection. In addition, the improved wettability should ensure that sufficient particles incorporate into the melt pool even at very high process speeds in order to achieve a high hard particle content in the MMC coatings.

尽管激光熔体注射与生产功能部件表面的其他工艺相比具有明显的技术优势，但由于工艺速度慢且生产率低，该工艺尚未在工业中得到广泛接受。然而，目前的研究表明高速熔体注射是可行的。而且，此时该工艺仅限于使用润湿性好的金属硬质材料，而氧化物颗粒则因润湿性差而无法加工。因此，该项目的总体目标是更好地了解高加工速度下的激光熔体注射过程。这种理解应该能够在最大加工速度、高加工速度下可实现的硬颗粒含量以及使用氧化物颗粒的可行性方面扩展当前的工艺限制。特别是，该项目旨在了解激光熔体注射过程中粉末颗粒在熔池中的结合行为。需要识别低速过程和高速过程之间的差异。粉末颗粒的掺入行为与输入因素基体熔体对硬质材料的润湿性、颗粒与基体熔体的密度比以及粉末颗粒的动能相关。通过识别主要影响参数，应开发出仍允许掺入高硬质颗粒含量的高速激光熔融注射工艺。为了提高硬质材料的润湿性，应首次在激光熔融注射中研究钛涂层硬质颗粒。特别是，这应该能够在激光熔融注射中使用氧化硬质材料。此外，改进的润湿性应确保即使在非常高的加工速度下也有足够的颗粒融入熔池中，以便在 MMC 涂层中实现高硬颗粒含量。