HIP法によるFe₄N焼結体の作成

抄録

Fe₄N powder, which is known as a softmagnetic material, was sintered by Hot Isostatic Pressing (HIP). The powder was obtained by heating a carbonyl iron powder at 500°C for 4h in the mixture of H₂-NH₃(60vol%). Then, the Fe₄N powder was encapsulated into an Al tube in troidal shape. Hipping was performed below 500°C to prevent the decomposition of Fe₄N. Single phase Fe₄N compact with 99% relative density was obtained under the condition of 450°C, 200MPa and 120min. The saturation magnetization of the compact was 150emu/g.