液态金属脱合金反应(Liquid Metal Dealloying,LMD)是一种基于熔融金属液中合金各组分与金属液反应性不同(混合焓正负关系)而产生的一种选择性溶解反应,是一种新型的多孔材料及复合材料的制备手段。本文首先从液态金属脱合金反应的概念...液态金属脱合金反应(Liquid Metal Dealloying,LMD)是一种基于熔融金属液中合金各组分与金属液反应性不同(混合焓正负关系)而产生的一种选择性溶解反应,是一种新型的多孔材料及复合材料的制备手段。本文首先从液态金属脱合金反应的概念和原理入手,详细介绍了此反应应用于纳米多孔材料与金属基复合材料的制备案例。在多孔材料制备方面,液态金属脱合金反应不仅可满足贱金属类纳米多孔材料的高效生产需求,还可通过脱合金反应条件调控孔隙结构。在复合材料制备方面,脱合金反应可使得析出相尺寸更加细小,分布更加均匀弥散,从而提高复合材料的综合力学性能。最后,本文对液态金属脱合金反应的最新应用与机理研究进行了概述,并对此类反应的未来应用进行了展望。展开更多
Inorganic binder used in casting process has the advantages of low odor,labor-friendly conditions,and relatively low cost,which is one of the main development directions for casting molding materials in the future.How...Inorganic binder used in casting process has the advantages of low odor,labor-friendly conditions,and relatively low cost,which is one of the main development directions for casting molding materials in the future.However,compared to organic binders(such as resin binders),inorganic binders exhibit lower bonding strength and are more sensitive to environmental humidity.This sensitivity poses challenges,particularly in the reclamation of used sand,thus limiting their broader application.In this paper,the research and application status of inorganic binders(mainly silicate inorganic binders)and their curing methods are summarized.In addition,the research and application of phosphate inorganic binders and 3D printing inorganic binders that are being developed are introduced.Meanwhile,a detailed comparative analysis is conducted on the challenging issue of“reclamation for used sand”in the application of inorganic binders.Finally,the development direction of inorganic binders is clarified.展开更多
Polypropylene is commonly used as a binder for ceramic injection molding,and rapid cooling is often encountered during processing.However,the crystallization behavior of polypropylene shows a strong dependence on cool...Polypropylene is commonly used as a binder for ceramic injection molding,and rapid cooling is often encountered during processing.However,the crystallization behavior of polypropylene shows a strong dependence on cooling rate due to its semi-crystalline characteristics.Therefore,the influence of cooling rate on the quality of final product cannot be ignored.In this study,the fast differential scanning calorimetry(FSC)test was performed to study the influence of cooling rate on the non-isothermal crystallization behavior and non-isothermal crystallization kinetics of a copolymer polypropylene(PP BC03B).The results show that the crystallization temperatures and crystallinity decrease as the cooling rate increases.In addition,two exothermic peaks occur when cooling rate ranges from 30 to 300 K·s^(-1),indicating the formation of another crystal phase.Avrami,Ozawa and Mo equations were used to explore the non-isothermal crystallization kinetics,and it can be concluded that the Mo method is suitable for this study.展开更多
文摘液态金属脱合金反应(Liquid Metal Dealloying,LMD)是一种基于熔融金属液中合金各组分与金属液反应性不同(混合焓正负关系)而产生的一种选择性溶解反应,是一种新型的多孔材料及复合材料的制备手段。本文首先从液态金属脱合金反应的概念和原理入手,详细介绍了此反应应用于纳米多孔材料与金属基复合材料的制备案例。在多孔材料制备方面,液态金属脱合金反应不仅可满足贱金属类纳米多孔材料的高效生产需求,还可通过脱合金反应条件调控孔隙结构。在复合材料制备方面,脱合金反应可使得析出相尺寸更加细小,分布更加均匀弥散,从而提高复合材料的综合力学性能。最后,本文对液态金属脱合金反应的最新应用与机理研究进行了概述,并对此类反应的未来应用进行了展望。
基金supported by the National Natural Science Foundation of China(Nos.52275334,52205361,51075163,and 50575085).
文摘Inorganic binder used in casting process has the advantages of low odor,labor-friendly conditions,and relatively low cost,which is one of the main development directions for casting molding materials in the future.However,compared to organic binders(such as resin binders),inorganic binders exhibit lower bonding strength and are more sensitive to environmental humidity.This sensitivity poses challenges,particularly in the reclamation of used sand,thus limiting their broader application.In this paper,the research and application status of inorganic binders(mainly silicate inorganic binders)and their curing methods are summarized.In addition,the research and application of phosphate inorganic binders and 3D printing inorganic binders that are being developed are introduced.Meanwhile,a detailed comparative analysis is conducted on the challenging issue of“reclamation for used sand”in the application of inorganic binders.Finally,the development direction of inorganic binders is clarified.
基金financially supported by a grant provided by Mitsubishi Heavy Industries。
文摘Polypropylene is commonly used as a binder for ceramic injection molding,and rapid cooling is often encountered during processing.However,the crystallization behavior of polypropylene shows a strong dependence on cooling rate due to its semi-crystalline characteristics.Therefore,the influence of cooling rate on the quality of final product cannot be ignored.In this study,the fast differential scanning calorimetry(FSC)test was performed to study the influence of cooling rate on the non-isothermal crystallization behavior and non-isothermal crystallization kinetics of a copolymer polypropylene(PP BC03B).The results show that the crystallization temperatures and crystallinity decrease as the cooling rate increases.In addition,two exothermic peaks occur when cooling rate ranges from 30 to 300 K·s^(-1),indicating the formation of another crystal phase.Avrami,Ozawa and Mo equations were used to explore the non-isothermal crystallization kinetics,and it can be concluded that the Mo method is suitable for this study.
