The development of advanced materials using novel powder metallurgy processes

使用新型粉末冶金工艺开发先进材料

• 批准号: RGPIN-2021-02421
• 负责人: Corbin, Stephen
• 金额: $ 2.4万
• 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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760152
• 关键词: development; advanced; materials; using; novel

Direct powder rolling (DPR) is a process where metallic powders are first compacted into a porous sheet or strip. This strip is then heated in a process known as sintering to allow the individual particles to bond and fuse together. The final step is to cold roll this porous, sintered strip to reduce its thickness and increase its density, ideally removing all the pores. In the case of Titanium and its alloys, the availability of a low-cost powder feedstock, in conjunction with the DPR process, is a potential way to produce lower cost Titanium sheet or foil for a range of industrial applications. However, to date the DPR process applied to Ti powder has not produced sheet with mechanical properties necessary for widespread commercial use. This has limited the use of Titanium in many applications. In this proposal, we will take advantage of unique roll compaction and cold rolling equipment to investigate and optimize the DPR method for producing Ti sheet from low cost powders. The cold rolling mill has the unique capability of measuring the roll force during cold rolling and thickness reduction. This will allow a quantitive study of roll mechanics and densification of porous metals to be completed. The individual rolls in the mill can be rotated at different speeds which allows asymmetric rolling to be performed. It is anticipated that asymmetric rolling will accelerate densification of the porous sheet and create a refined microstructure. Both these features acting together should produce sheets with improved mechanical properties. The fundamental understanding achieved through this research will lead to the development of the relationship between the DPR process, sheet microstructure and mechanical properties. In turn, the work has the potential to break through the current performance barrier of Ti sheet materials derived from low cost powders. This will increase the use of this light metal in the Canadian aerospace and automotive industries, facilitating weight reduction, lower fuel economy and ultimately a reduction in greenhouse gases.

直接粉末轧制（DPR）是一种将金属粉末首先压实成多孔片状或带材的工艺。然后在烧结过程中加热这条金属带，使单个颗粒结合并融合在一起。最后一步是冷轧这种多孔的烧结带材，以减少其厚度并增加其密度，理想情况下去除所有的孔隙。就钛及其合金而言，低成本粉末原料的可用性与DPR工艺相结合，是生产低成本钛片或箔的潜在方法，可用于一系列工业应用。然而，迄今为止，应用于钛粉的DPR工艺尚未生产出具有广泛商业用途所需的机械性能的板材。这限制了钛在许多应用中的使用。在本课题中，我们将利用独特的轧辊压实和冷轧设备，研究和优化DPR方法，以低成本的粉末生产钛板。冷轧机具有测量冷轧和减厚过程中轧制力的独特能力。这将允许完成对滚压力学和多孔金属致密化的定量研究。轧机中的单个轧辊可以以不同的速度旋转，从而可以进行非对称轧制。预计不对称轧制将加速多孔板的致密化，并产生精细的微观结构。这两种特性共同作用将产生具有更好机械性能的板材。通过本研究获得的基本理解将导致DPR工艺，板材微观结构和力学性能之间关系的发展。反过来，这项工作有可能突破目前由低成本粉末制成的钛片材料的性能障碍。这将增加这种轻金属在加拿大航空航天和汽车工业中的使用，有助于减轻重量，降低燃油经济性，最终减少温室气体排放。