Effect of C on Phase Evolution, Microstructure, and Magnetic Properties of Pr2Fe14B-Type Nanocomposites
The phase evolution, microstructure and magnetic properties of melt-spun Pr-rich Pr11FebalB8-yCy, (y = 0-8) and Pr-lean Pr9Febal.TixB11-yCy (x = 0, 2.5 and 4; y = 0-11) ribbons have been investigated intensively. A slight substitution of C for B (y=2) was proven to be effective in improving the magnetic properties of Pr-rich Pr11FebalB8-yCy nanocomposites. C atoms prefers to enter 2:14:1 phase in forming Pr2Fe14(B, C). But the volume fraction of Pr2Fe17Cz, α-Fe and 1:2 carbide increases, due to the dissociation of 2:14:1 phase and the suppression of Fe2B phase, with further increase of carbon content. The optimal magnetic properties of Br = 9.4 kG, iHc = 9.3 kOe, and (BH)max = 17.3 MGOe were obtained for Pr11FebalB6C2. In contrast, the increase of C substitution in Pr9Febal.Ti2.5B11-yCy (y=0-11) ribbons degrades the Br, iHc and (BH)max monotonically, which is arisen from the increase of vol ％ of Pr2Fe17Cz and α-Fe phases, and the rapid decrease of 2:14:1 phase. In comparison with those of Pr9FebalB11-yCy(y=0-5.5) ribbons, improved magnetic properties of (BH)max=153-17.8 MGOe with higher coercivity of iHc=9.7-10.8 kOe have been obtained in Ti-containing PT9Febal.Ti2.5B11-yCy (y=0-5.5) ribbons. However, in higher Ti concentration Pr9Febal.Ti4B11-yCy, ribbons, a slight substitution of C for B (y = 0.5-1) is beneficial in improving the coercivity and magnetic energy product, simultaneously. The optimal properties of Br = 9.4 kG, iHc = 11.1 kOe, (BH)max = 18.0 MGOe and α = -0.146 ％/℃, β = -0.576 ％/℃ were achieved in Pr9FebalTi4B10.5C0.5 nanocomposites.
PrFeB PrFeC permanent magnet nanocomposite melt spinning ezchange-coupling
C.H.Chiu H.W.Chang C.W.Chang W.Y.Zhang W.C.Chang
Department of Physics, National Chung Cheng University, Taiwan, China Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, China FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische UniversitSt Darmstad
国际会议
北京
英文
136-145
2006-08-29（万方平台首次上网日期，不代表论文的发表时间）