Inert Gas Atomization Process Variables for Tool Steel Powder Production
Melt superheat, gas-to-metal ratio, and aspiration pressure dictate particle size distribution, cooling rate, and oxide pickup in tool steel powder production.
M2 Speed Steel
Meaning
Molybdenum-tungsten alloyed tool steels characterized by high hardness and elevated wear resistance serve as tooling materials for battery electrode slitting operations. Machining components from m2 speed steel provides the hardness necessary to cut abrasive ceramic-coated separators and coated metal foils. The alloy’s utility diminishes when tool temperatures exceed its tempering threshold.
Alloy Composition
High carbon content combined with tungsten, molybdenum, vanadium, and chromium yields a balanced microstructure rich in primary carbides. Proper heat treatment and double tempering produce a hardness between sixty-two and sixty-six on the Rockwell C scale. This structural composition resists abrasive degradation when slitting dense cathode coatings containing lithium metal oxides.
Edge Retention
Slitting knives made from this steel maintain razor sharpness across millions of cut meters without edge chipping. Clean shearing action minimizes burr formation on thin copper and aluminum current collectors during continuous roll slitting. Maintaining burr heights below ten micrometers prevents internal short circuits in wound and stacked pouch cells.
Tooling Wear
Progressive abrasive wear dulls blade profiles, requiring scheduled re-grinding and surface reconditioning. Operating dull cutting edges produces metal slivers and uneven coating flaking, leading to high electrode rejection rates. Applying physical vapor deposition coatings like titanium aluminum nitride extends tool life during high-volume production runs.