Improvement of coercivity of Nd-Fe-B powder by Nd-Cu sputtering

Ami Iijima, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This paper reports improvement of the coercivity of Nd-Fe-B powder by Nd-Cu sputtering. The total rare earth element content of the Nd-Fe-B powder increased by 0.8 mass% after Nd-Cu sputtering, and the sputtered Nd-Cu was observed at the surface of Nd-Fe-B powder by microstructural observation. The coercivity (Hc) of the Nd-Cu-sputtered Nd-Fe-B powder improved after annealing at temperatures above 600°C, and Hc of the sputtered powder reached a maximum value of 1312 kA m-1 after annealing at 900°C. This Hc value was 470 kA m-1 higher than that of Nd-Fe-B powder without sputtering. Isotropic green compacts were prepared from Nd-Fe-B powders with and without Nd-Cu sputtering, and the sputtering also improved Hc in the compacts. The compact prepared from powder with sputtering had Hc of 630 kA m-1 higher than that of the compact prepared from powder without sputtering after annealing at 900°C. Microstructure observation showed that the improvement of Hc was due to an increase in the Nd-rich phase in the compact by Nd-Cu sputtering.

Original languageEnglish
Pages (from-to)825-828
Number of pages4
JournalMaterials Transactions
Issue number5
Publication statusPublished - 2017


  • Coercivity
  • Neodymium-copper
  • Neodymium-iron-boron powder
  • Sputtering


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