Synthesis of metastable Fe_3C,Co_3C and Ni_3C by mechanical alloying

机械合金化合成亚稳态Fe_3C、Co_3C和Ni_3C

• 批准号: 08650764
• 负责人: TOKUMITSU Kazuto
• 金额: $ 1.6万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650764/
• 关键词: Mechanical alloying; Ball milling; Solid state reaction; Metastable phase; Metal carbie; Iron; Cobalt; Nickel

Metastable Fe_3C,Co_3C and Ni_3C could be obtained by mechanical alloying of metal Fe, Co and Ni powders with carbon powders at room temperature. Their crystal structures, thermal stabilities and magnetic properties were evaluated by X-ray diffraction (XRD), defferential scanning calorimetory (DSC) and vibration sample magnetometer (VSM).These metastable metal carbides have not been obtaioned by conventional methods, so their presence are not discribed in equilibrium phase diagrams. Mechanical alloying method enabled us the preparation of metastable phases, because this is a method to synthesize any power samples at room temperature.By XRD analysis, it is concluded that Fe_3C is orthothombic, Co_3C transition type from orthorhomibic to hcp, Ni_3C hcp structure, which suggested that the structure of these carbides were governed by the state of 3d electrons of these metal elements{(3d)^6for fe, (3d)^7for Co and (3d)^8for Ni}. The decomposition temperatures were 1227ﾟC,468ﾟC respectively. Saturation magnetizations were 218emu/g, 1.98emu/g and 0.45emu/g. The latter two were not ferromagnetic for M-T mesurements, which it were not fitted by Curie Weiss rule.

采用机械合金化方法，将金属Fe、Co、Ni粉末与碳粉在室温下进行合金化，可以得到亚稳的Fe_3C、Co_3C和Ni_3C。用X射线衍射（XRD）、差示扫描量热仪（DSC）和振动样品磁强计（VSM）研究了它们的晶体结构、热稳定性和磁性能。机械合金化法是一种可以在室温下合成任何粉末样品的方法，因此可以制备出亚稳相，通过XRD分析得出Fe_3C为正交相，Co_3C为正交相到六方相的过渡型，Ni_3C为六方相的结构，这表明这些碳化物的结构受这些金属元素的3d电子状态的控制{（3d）^6对于Fe，（3d）^7为Co，（3d）^8为Ni}。分解温度分别为1227 ℃、468 ℃。饱和磁化强度分别为218 emu/g、1.98emu/g和0.45emu/g。后两者对M-T介观体系不具有铁磁性，不符合居里韦斯规则。

项目成果

徳満和人: "メカニカルアロイング法の少し変った試み" トライボロジスト. 41・2. 22-27 (1996)

Kazuto Tokumitsu：“机械合金化方法的一次稍微不寻常的尝试”摩擦学家 41・2（1996）。

C.Zhou and K.Tokumitsu: "Bulk mechanical Alloying of Co-Cu" Ceramic Eng.&Science. 18. 99-103 (1997)

C.Zhou 和 K.Tokumitsu：“Co-Cu 的整体机械合金化”陶瓷工程。

C.Zhou and K.Tokumitsu: "Bulk mechanical Alloying of Co-Cu" Ceramic Eng.& Science. 18. 99-103 (1997)

C.Zhou 和 K.Tokumitsu：“Co-Cu 的整体机械合金化”陶瓷工程。

K.Tokumitsu: "Synthesis of metastable hcp Co_3C by mechanical alloying method" J.Alloys & Compounds.

K.Tokumitsu：“机械合金化法合成亚稳态hcp Co_3C” J.Alloys

K.Tokumitsu: "Synthesis of metastable Fe_3C,Co_3C and Ni_3C by mechanical alloying" Materials Scienc Forum. 235. 127-132 (1997)

K.Tokumitsu：“通过机械合金化合成亚稳态 Fe_3C、Co_3C 和 Ni_3C”材料科学论坛。