New Chemistries for Metal Matrix Composites

金属基复合材料的新化学物质

• 批准号: RGPIN-2021-02386
• 负责人: Obrovac, Mark
• 金额: $ 2.62万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741947
• 关键词: New; Chemistries; Metal; Matrix; Composites

In this research program new synthesis methods will be used to enable new bulk and surface chemistries of alloys and metal matrix composites (MMCs) made by laser powder bed fusion (LPBF). In the LPBF method, metal parts are essentially 3D printed with a laser from metal powders, allowing the creation of metal parts with complex shapes and with properties not otherwise attainable. However, the composition of LPBF parts is limited by the spray atomization method used to make metal powders. In addition, although highly desirable, the surface chemistry of Al makes Al-based alloys amongst the most difficult to process by LPBF. New chemistries are required to solve these issues. It would also be highly desirable to make LPBF parts from metal matrix composites (MMCs), in which reinforcing ceramic particles are incorporated in the alloy. MMCs are highly useful for lightweight structural components to increase fuel economy in aircraft and automobiles. However, MMCs are generally incompatible with LPBF methods. In this research program new synthesis methods will be used to significantly increase the chemical compositions of alloys obtainable by the LPBF method. This research is enabled by dry particle microgranulation, recently developed in the Obrovac lab, which can convert ball milled powders into smooth, spherical powders with morphologies that are compatible with LPBF. In addition, surface coatings, internal composition gradients and even ceramic reinforcing particles may be introduced into the particles. This enables a wide variety of alloy matrix chemistries, surface chemistries and reinforcing chemistries to be used in LPBF, further enabling new MMCs to be made by this process. The precise control of particle morphology, independent of particle composition, also allows fundamental studies of the chemistry of the LPBF process. These new methods have never been applied to the synthesis of alloys. This research program will combine bulk alloy chemistry, surface chemistry, alloy synthesis, and nano-scale particle design, giving students a rich and valuable training experience. Outcomes of this research program are the production of new alloy parts using compositions and microstructures that have been otherwise hindered because of cost, poor particle flow characteristics or safety issues. This could greatly benefit the environment and Canadian automotive and aerospace industries by providing inexpensive and lightweight high strength parts; thereby reducing cost, improving fuel economy and improving the range of EVs.

在这项研究计划中，将使用新的合成方法来实现新的块体和表面化学，通过激光粉末床熔合(LPBF)制备合金和金属基复合材料(MMC)。在LPBF方法中，金属零件基本上是用激光从金属粉末中进行3D打印，从而可以制造出形状复杂、具有其他方式无法获得的性能的金属零件。然而，LPBF零件的成分受到用于制备金属粉末的喷雾雾化方法的限制。此外，虽然铝的表面化学成分非常理想，但它使铝基合金成为LPBF最难加工的合金之一。解决这些问题需要新的化学方法。由金属基复合材料(MMCs)制造LPBF部件也是非常必要的，在MMCs中加入增强陶瓷颗粒。在飞机和汽车中，金属基复合材料对于提高飞机和汽车的燃油经济性是非常有用的轻质结构部件。然而，MMC通常与LPBF方法不兼容。在这项研究计划中，将使用新的合成方法来显着提高LPBF方法可获得的合金的化学成分。这项研究是由Obrovac实验室最近开发的干颗粒微粒化实现的，它可以将球磨粉末转化为光滑的球形粉末，其形貌与LPBF兼容。此外，还可以在颗粒中引入表面涂层、内部组成梯度甚至陶瓷增强颗粒。这使得可以在LPBF中使用各种合金基化学成分、表面化学成分和增强化学成分，从而进一步能够通过该工艺制造新的金属基复合材料。对颗粒形态的精确控制与颗粒组成无关，也允许对LPBF过程的化学进行基础研究。这些新方法从未被应用于合金的合成。该研究项目将结合块体合金化学、表面化学、合金合成和纳米颗粒设计，为学生提供丰富而宝贵的培训经验。这项研究计划的成果是使用成分和显微组织生产新的合金部件，这些成分和组织因成本、较差的颗粒流动特性或安全问题而受到阻碍。通过提供廉价、轻便的高强度零部件，这将极大地有利于环境和加拿大的汽车和航空航天行业；从而降低成本，提高燃油经济性，并扩大电动汽车的续航里程。