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用机械合金化方法研究了NdFe12 -xVxNδ 各向同性粉末的结构和永磁性能 .发现在 70 0～ 90 0℃退火机械合金化粉末时 ,除了钒含量x =1的样品在 75 0℃以下退火时 ,晶化不完全 ,有大量的α -Fe(V)相析出外 ,其余的样品在 70 0～ 90 0℃退火温度范围内都形成了Nd(Fe ,V) 12 相 .氮化后 ,体积膨胀约为 5 % ,居里温度提高 1 40～ 1 60℃ .NdFe12 -xVNδ 氮化物的居里温度为 469～ 485℃ .增加钒含量 ,NdFe12 -xVxNδ 内禀矫顽力增加 ,对x=2在 75 0℃退火后渗氮的样品矫顽力 iHc=870kA/m .机械合金化不同钒含量的NdFe12 -xVxNδ 氮化物样品矫顽力的差别可归因于不同钒含量样品晶化行为的差和氮化过程中相的稳定性 .
The structure and permanent magnet properties of NdFe12-xVxNδ isotropic powders were investigated by mechanical alloying method, and it was found that when the mechanical alloying powders were annealed at 70 0 ~ 90 0 ℃, the samples except vanadium content x = 1 annealed below 75 0 ℃ , Incomplete crystallization, a large number of α-Fe (V) phase precipitates, and the remaining samples formed Nd (Fe, V) 12 phase in the annealing temperature range of 70 0 ~ 90 0 C. After nitriding, The volume expansion is about 5%, and the Curie temperature is increased by 140 ~ 160 ℃ .The Curie temperature of NdFe12-xVNδ nitride is 469 ~ 485 ℃, the intrinsic coercivity of NdFe12-xVxNδ increases with increasing vanadium content, 2 The coercivity iHc = 870kA / m of the sample after nitriding annealing at 75 ℃ .The mechanical properties of NdFe12-xVxNδ nitride samples with different vanadium content can be attributed to the crystallization behavior of samples with different vanadium content Poor and phase stability during nitriding.