Metallurgical Chemistry of Liquid Alloys and Molten Slags

液态合金和熔渣的冶金化学

• 批准号: RGPIN-2015-05459
• 负责人: Mclean, Alexander
• 金额: $ 2.55万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=685581
• 关键词: Metallurgical; Chemistry; Liquid; Alloys; Molten

The following research activities have been designed with three objectives in mind: 1) Development of new fundamental knowledge that relates to the processing of liquid metal alloys and oxide melts; 2) Thematic topics that will fulfill the requirements for graduate and undergraduate thesis projects; and 3) Research that will provide students with hands-on training experience in experimental techniques and materials characterization procedures involving high temperature furnaces, advanced electron-optic facilities, XRD equipment and modern analytical systems. To achieve these objectives, research will be conducted based on two distinct themes: nitrogen dissolution in molten oxides, and solute interactions within iron alloys. ******1. The processes involved in iron and steelmaking are based directly or indirectly on the control of slag chemistry, which in turn has a profound influence on slag structure, and therefore slag properties and performance. In view of the importance of slag control there is an increasing need to generate information pertaining to the characterization, properties and performance of oxide melts and synthetic fluxes. The increasing demand for low nitrogen steel has prompted interest in the possibility of using custom-designed fluxes to remove nitrogen from steel melts. Nitrogen can dissolve in slags in two distinct forms, free nitride where the nitrogen replaces free oxygen ions; and incorporated nitride where the nitrogen replaces oxygen ions involved in the network of polymerized anions. The objective of the proposed research will be to conduct thermodynamic and kinetic studies using a thermo-gravimetric technique and a selective analytical method to quantify the different species of nitrides present in different oxide melts and synthetic fluxes and thus develop an improved understanding of how slag chemistry influences slag performance.******2. In recent years the need for alloy irons for critical applications within the automotive sector have required the production of materials with very low contents of non-metallic inclusions and carefully controlled amounts of the residual elements oxygen, sulphur and nitrogen. The nodularization and high temperature properties of these ductile irons are strongly influenced by silicon, aluminum, cerium and other rare earths. The objective of this project is to use levitated droplets to determine the effect of these alloying additives on the activity coefficients of oxygen, sulphur and nitrogen with iron-carbon alloys, rather than pure iron, as the solvent. Falling droplet experiments will also be conducted in order to determine the reoxidation behaviour and nitrogen absorption encountered when these alloy irons are allowed to fall for fractions of a second through air and potentially protective atmospheres such as argon and nitrogen.  **************************

在研究中，考虑了三个目标：1）与液体金属的加工相关的新基金会。涉及涉及IGH温度炉，高级电子设施，XRD设备和现代分析系统的实验技术和材料表征程序，将基于两个不同的主题进行。炉渣化学反过来对炉渣结构产生深远的影响，那里的炉渣控制在那里陷入了与氧化物融化和合成通量的表征，性质和性能有关的植物。已经提出了对使用定制设计的通量从钢熔体中去除氮的可能性。替换参与聚合阴离子网络的氧气离子。如何影响e汽车领域，需要低含量的非金属包裹物和仔细控制的元素氧气，硫和氮的含量。铝，葡萄和其他稀有耳朵的目的。作为溶剂，还将进行下降的液滴实验，以确定当这些合金熨斗被允许降落的氮和潜在的保护氛围时，遇到了氮气的再氧化行为和氮的吸收。 *********************************************************** *