Advanced surface modification agents and modification technologies for powder metallurgy

这项工作的目标是开发和测试先进的表面改性剂和 粉末冶金的改性技术。该项目将专注于积极的合作 力拓公司和麦克马斯特大学。力拓是高质量的主要制造商之一 按粉末冶金技术生产的产品。粉末冶金加工涉及金属粉末混合物的制造，包括 粘结剂和润滑剂，并将其压实成特定形状，然后进行烧结。罚金的使用 添加剂对最终的显微组织、成分和功能性能至关重要 产品。然而，精细添加剂在加工过程中容易在混合物中偏析。罚金刑的分离 添加剂对粉末流动性有不利影响，这是粉末流动性的关键特征之一。 压实。混合物流动不良通常会导致模腔充填性能差，从而导致密度增加。 梯度、机械应变、成分梯度、烧结后尺寸一致性降低、应变 形成的产品和较低的生产率。粉末冶金混合料中的相分离问题及劣化 在拟议的研究中，将解决烧结前产品压制过程中的粉末流动性问题。 力拓对新的表面改性技术和材料感兴趣，目前正在 麦克马斯特大学的发展。该方法的基础是使用新的润滑剂和粘结剂 粉末冶金混合料的制造。新型润滑剂和粘结剂的独特之处在于它们具有很强的螯合作用。 性能，这使它们成为不同材料的通用表面改性剂。在这种方法中， 将避免细小颗粒的分离，增强混合物的流动性将导致改善 单个组件的分布，增强了最终产品的功能特性，并增强了 生产率。该项目满足了加拿大工业对先进粉末冶金技术的需求。好处是 该项目将包括向力拓转让技术和加拿大HQP项目经理培训，材料 加工、表面工程和纳米技术以及粉末冶金等领域的新基础知识。

The objective of this work is the development and testing of advanced surface modification agents and modification technologies for powder metallurgy (PM). The project will be focused on active collaboration of Rio Tinto company and McMaster University. Rio Tinto is one of the major manufacturers of high quality products by PM technologies. PM processing involves the fabrication of mixes of metal powders, containing binders and lubricants, and their compaction into specific shapes, followed by sintering. The use of fine additives is of critical importance for the final microstructure, composition and functional properties of the products. However, fine additives are prone to segregation in mixes during processing. The segregation of fine additives has detrimental effect on powder flowability, which is one of the key characteristics during compaction. Poor flow of mixes usually results in poor die cavity filling performance, which leads to density gradients, mechanical strain, composition gradients, reduced dimensional consistency after sintering, stain formation in products and lower production rates. The problem of phase segregation in the PM mixes and poor powder flowability during compaction of products before sintering will be addressed in the proposed research. Rio Tinto is interested in new surface modification technologies and materials, which are currently under development at McMaster University. The approach is based in the use of new lubricants and binders for the fabrication of PM mixes. The unique feature of new lubricants and binders is related to their strong chelating properties, which makes them universal surface modification agents for different materials. In this approach the segregation of fine particles will be avoided and enhanced flowability of the mixes will result in improved distribution of individual components, enhanced functional properties of final products and enhanced production rate. The project meets the needs of Canadian industry in advanced PM technologies. The benefits of this project will include technology transfer to Rio Tinto and Canadian HQP training in PM, materials processing, surface engineering and nanotechnology and new fundamental knowledge in PM and other fields.