球磨诱发α-Fe粉与间苯二胺混合物的固相反应

SOLID REACTION BETWEEN α-Fe POWDERS AND m-PHENYLENE DIAMINE INDUCED BY BALL MILLING

研究了球磨α－Ｆｅ粉末与间苯二胺混合时发生的固相反应以及铁氮化物的形成机理．在球磨过程 中，随着球磨时间的延长α－Ｆｅ粉末与间苯二胺混合物发生的相变为α－Ｆｅ→α′－Ｆｅ（Ｎ）→ε－Ｆｅ２－３Ｎ 球磨２５０ｈ后，可得到含有１１．５３％Ｎ（质量分数）的过饱和ε－Ｆｅ２－３Ｎ相，它在５１２℃以下是稳定的， 其饱和磁化强度为 ８１．４ｅｍｕ／ｇ 剩磁为３３．８ ｅｍｕ／ｇ，矫顽力为１６．３ｋＡ／ｍ．与固－气反应相比，用 固－固反应制备δ－Ｆｅ２－３Ｎ相的效率更高．

The solid state synthesis reactions between elemental α-Fe powder and m-phenylene diamine (C6H4(NH2)2) have been studied. The phase transformation in the milling process is α- Fe→α＇-Fe(N)→ε-Fe2-3N. The single supersaturated ε-Fe2-3N phase with nitrogen concentration up to 11.53%(mass fraction) was obtained after ball milling for 250h. Owing to the local inhomogeneity of N content the ε-Fe2-3N phase can be formed by ball milling at room temperature, even though the sample has a low average N content. The saturation magnetization Ms and coercivity Hc of ε-Fe2-3N are 81.4 emu/g and 16.3 kA/m respectively. Thermal analysis experiments show structural stability of the ε-Fe2-3N phase up to 512.0℃. The results show that the solid-solid reaction is more efficient than the solid-gas reaction.