Mechanistic Insights into the Pre-Lithiation of Silicon/ Graphite Negative Electrodes in “Dry State” and After Electrolyte Addition Using Passivated Lithium Metal Powder. Adv. Energy Mater. 2021, 11, 2100925 (2021 影响因子: 29.698)对“干态”硅/石墨负极预锂化和使用钝化锂金属粉末添加电解质后的机理洞察
金属 3D 打印技术在医疗、牙科、汽车、航空航天和国防工业中的应用正以指数级的速度增长。到 2027 年,全球金属 3D 打印市场预计将达到 60 亿美元1。虽然金属 3D 打印前景光明,但该技术的应用仍面临着以下挑战:原料粉末流动性差、打印过程中发生金属粉末氧化、产生有害副产物和夹杂物以及造成成品的缺陷等。
加拿大École de technologie supérieure的Vladimir Brailovski团队通过两种不同雾化技术(即等离子体雾化和气体雾化)生产三批Ti-6Al-4V粉末,并对其进行粒度和流动性的表征,不同层厚度和构建方向的测试样本进行3D打印和后处理,从而建立粉末特性与最终产品在几何和机械性能之间的相关性。这项研究表明,使用具有有限数量细颗粒的高度球形粉末可提高其流动性,并获得具有改善的机械和几何特性的LPBF组件。
ABSTRACT: This is a study of the flow properties of a range of magnetic toners produced from a common base in relation to three physical variables – the milling method, the type and amount of flow additive and to a limited extent, particle size.Two methods of milling were used for sample preparation – air jet milling and mechanical milling. The flow additives were either HMDS or PDMS silicas.The study used the FT3 powder Rheometer (Freeman Technology) to determine the rheology of powder samples in terms of the energy required to cause a powder to flow.The dependence upon environmental factors commonly imposed on powders such as flow rate, the level of aeration and the amount of consolidation are determined for each of the materials. The propensity to retain air is also investigated and quantified. The results clearly indicate the complex nature of toners and how their flow properties are affected by a large number of variables, of which one of the most significant is the effect of aeration and de-aeration representing the transition from fluidisation to consolidation.
纳米粉末比表面积的测定——B.E.T.法1 范围本标准规定了纳米粉末比表面积的测定方法。本标准用于纳米粉末比表面积的测定。测定范围1 m 2/g~1000 m 2/g。其它类型粉末及微孔材料比表面积测定可参照使用。2 规范引用文件下列文件的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件,其随后所有的修改单(不包括勤误的内容)或修订版不适于本标准,然而,鼓励根据本标准达成协议的各方研究是否可使用这些文件的最新版本。凡是不注明日期的引用文件,其最新版本适用于本标准。3 术语3.1.1吸附adsorption吸附气体在粉末表面上的富集。3.1.2物理吸附physisorption吸附质一很弱的力粘结起来,稍加改变压力或温度,过程即可逆转。3.1.3吸附气体adsorptive被吸附的测量气体。