JP2003221655A5 - - Google Patents

Claims (14)

Composition formula _{(Fe 1-m T m)} 100-xyzn Q x R y Ti z M n ( however, T is at least one element selected from the group consisting of Co and Ni, Q consists of B and C At least one element selected from the group, R is at least one rare earth element selected from the group consisting of Nd, Pr, Dy and Tb, and at least one selected from the group consisting of at least Nd and Pr M is selected from the group consisting of Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au, and Pb. At least one element), and the composition ratios x, y, z, m, and n are 10 <x ≦ 20 atomic%, 6 ≦ y <10 atomic%, and 0.5 ≦ z ≦ 12 atoms, respectively. %, 0 ≦ m ≦ 0.5, and 0 ≦ n ≦ 10 A nanocomposite magnet to have a composition represented by the child%),
Oxygen content Ri der less 1500ppm by weight, with 60% by volume or more of the hard magnetic phase, the nanocomposite magnet. 2 or more types of ferromagnetic crystal phases including a soft magnetic phase and a hard magnetic phase, and the soft magnetic phase exists as a grain boundary phase or a sub-grain boundary phase around the hard magnetic phase. The nanocomposite magnet described. The average crystal grain size of the hard magnetic phase in 5nm or 200nm or less, the average crystal grain size of the soft magnetic phase has a structure which is in the range of 1nm or 50nm or less, a nanocomposite magnet according to claim 2. The nanocomposite magnet according to claim 2 or 3, wherein an average crystal grain size of the soft magnetic phase is smaller than an average crystal grain size of the hard magnetic phase. 5. The nanocomposite magnet according to claim 2, wherein the hard magnetic phase includes an R ₂ Fe ₁₄ B type compound phase. 6. The nanocomposite magnet according to any one of claims 1 to 5 , which has a hard magnetic property with a residual magnetic flux density B _r ≥ 0.7 T and an intrinsic coercive force H _cJ ≥ 480 kA / m. The nanocomposite magnet according to any one of claims 1 to 6 , wherein the oxygen content is 700 ppm or less on a mass basis. The nanocomposite magnet according to any one of claims 1 to 7 , wherein the nitrogen content is 400 ppm or less on a mass basis. The nanocomposite magnet according to claim 8 , which has hard magnetic properties of a residual magnetic flux density B _r ≧ 0.8 T and an intrinsic coercive force H _cJ ≧ 550 kA / m. Composition formula _{(Fe 1-m T m)} 100-xyzn Q x R y Ti z M n ( however, T is at least one element selected from the group consisting of Co and Ni, Q consists of B and C At least one element selected from the group, R is at least one rare earth element selected from the group consisting of Nd, Pr, Dy and Tb, and at least one selected from the group consisting of at least Nd and Pr M is selected from the group consisting of Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au, and Pb. At least one element), and the composition ratios x, y, z, m, and n are 10 <x ≦ 20 atomic%, 6 ≦ y <10 atomic%, and 0.5 ≦ z ≦ 12 atoms, respectively. %, 0 ≦ m ≦ 0.5, and 0 ≦ n ≦ 10 A nanocomposite magnet to have a composition represented by the child%),
Nitrogen content Ri der less 400ppm by weight, with 60% by volume or more of the hard magnetic phase, the nanocomposite magnet. The two or more types of ferromagnetic crystal phases including a soft magnetic phase and a hard magnetic phase are contained, and the soft magnetic phase exists as a grain boundary phase or a subgrain boundary phase around the hard magnetic phase. The nanocomposite magnet described. The average crystal grain size of the hard magnetic phase in 5nm or 200nm or less, the average crystal grain size of the soft magnetic phase has a structure which is in the range of 1nm or 50nm or less, a nanocomposite magnet according to claim 11. The average crystal grain size of the soft magnetic phase is smaller than the average crystal grain size of the hard magnetic phase. The nanocomposite magnet according to claim 11 or 12. The nanocomposite magnet according to claim 10 , wherein the hard magnetic phase includes an R ₂ Fe ₁₄ B type compound phase.