JP7253069B2 - 希土類永久磁石材料及びその原料組成物、製造方法、並びに応用 - Google Patents
希土類永久磁石材料及びその原料組成物、製造方法、並びに応用 Download PDFInfo
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Description
R:29.0~32.0wt.%、且つRにはRHが含まれ、前記RHの含有量が1wt.%より大きい、
Cu:0.30~0.50wt.%、但し0.50wt.%を含まない、
Co:0.10~1.0wt.%、
Ti:0.05~0.20wt.%、
B:0.92~0.98wt.%、
残部:Feおよび不可避の不純物、
ここで、前記Rは希土類元素であり、前記Rには少なくともNdが含まれ、
前記RHは重希土類元素であり、前記RHには少なくともTbが含まれる。
R:29.5~32.0wt.%、前記RHの含有量が1.05~1.3wt.%である、
Cu:0.30~0.45wt.%、
Co:0.50~1.0wt.%、
Ti:0.10~0.20wt.%、
B:0.92~0.96wt.%、
wt.%とは、前記R-T-B系永久磁石材料における質量百分率を意味する。
R:29.0~31.5wt.%、且つRにはRHが含まれ、前記RHの含有量が0.1~0.9wt.%である、
Cu:0.30~0.50wt.%、但し0.50wt.%を含まない、
Co:0.10~1.0wt.%、
Ti:0.05~0.20wt.%、
B:0.92~0.98wt.%、
残部:Feおよび不可避の不純物、
ここで、前記Rは希土類元素であり、前記Rには少なくともNdが含まれ、
前記RHは重希土類元素である。
R:29.5~31.0wt.%、RH:0.5~0.9wt.%、
Cu:0.30~0.45wt.%、
Co:0.50~1.0wt.%、
Ti:0.10~0.20wt.%、
B:0.92~0.96wt.%、
wt.%とは、前記R-T-B系永久磁石材料の原料組成物における質量百分率を意味する。
(1)本発明におけるR-T-B系永久磁石材料は、性能が優れ、Br≧14.30kGs、Hcj≧24.1kOeであり、BrとHcjの同時改善を達成した。
(2)通常の成分に比べ、本発明におけるR-T-B系永久磁石材料では、Cuを0.30wt.%以上、Tiを0.05~0.20wt.%添加し、一部のTiが粒界に入り込んで高CuリッチTi相を形成し、これらの相が粒界拡散において完全に溶解でき、粒界拡散に有利であるので、Hcjが大幅に向上される。
実施例1-14、比較例1-11で得られたR-T-B系永久磁石材料の磁気特性および成分を測定し、その磁性体の結晶構造を電界放出電子プローブマイクロアナライザ(FE-EPMA)で観察した。
(1)本願におけるR-T-B系永久磁石材料は、性能が優れ、Br≧14.30kGs、Hcj≧24.1kOeであり、BrとHcjの同時改善を達成した(実施例1-14)。
(2)本願の成分に基づいて、原料R、Cu、Co、Ti及びBの使用量が変化し、R-T-B永久磁石材料の性能が著しく低下した(比較例1-6)。
(3)発明者は研究過程において、Cu及び高融点のTiを比較的大量に添加し、一部のTiが粒界に入り込んで高Cu高Ti相を形成することは、R-T-B系永久磁石材料の性能の向上に有利であるが、性質が類似する元素はいずれもこの相を形成できるわけではなく、例えば、GaおよびAlの添加(比較例7)、さらに例えばZr、Mo、Wなどの高融点金属の添加(比較例8-10)は、いずれも本願におけるR-T-B系永久磁石材料を得ることができないことを発見した。
Claims (3)
- R-T-B系永久磁石材料であって、質量百分率で下記の成分を含み、
R:29.0~32.0wt.%、且つRにはRHが含まれ、前記RHの含有量が1wt.%より大きい、
Cu:0.30~0.50wt.%、但し0.50wt.%を含まない、
Co:0.10~1.0wt.%、
Ti:0.05~0.20wt.%、
B:0.92~0.98wt.%、
残部:Feおよび不可避の不純物、
ここで、前記Rは希土類元素であり、前記Rには少なくともNdが含まれ、
前記RHは重希土類元素であり、前記RHには少なくともTbが含まれ、
前記R-T-B系永久磁石材料は、磁石の粒界に、組成比が(T1-a-b-Tia-Cub)x-Ryである高Cu高Ti相が存在しており、
ここで、TはFeとCoを表し、1.5b<a<2b、70at%<x<82at%、18at%<y<30at%であり、at%とは、前記R-T-B系永久磁石材料における各元素の原子含有量が占める割合を意味する、
ことを特徴とするR-T-B系永久磁石材料。 - 前記Rの含有量は、29.5~32.0wt.%であり、及び/又は、
前記RHにはDyがさらに含まれ、及び/又は、
前記RHの含有量は、1.05~1.30wt.%であり、及び/又は、
前記Cuの含有量は、0.30~0.45wt.%であり、及び/又は、
前記Coの含有量は、0.10wt.%または0.50~1.0wt.%であり、及び/又は、
前記Tiの含有量は、0.05wt.%または0.10~0.20wt.%であり、及び/又は、
前記Bの含有量は、0.92~0.96wt.%または0.94~0.98wt.%であり、wt.%とは、前記R-T-B系永久磁石材料における質量百分率を意味する、
ことを特徴とする請求項1に記載のR-T-B系永久磁石材料。 - 前記R-T-B系永久磁石材料は、下記の成分を含み、
R:29.5~32.0wt.%、前記RHの含有量が1.05~1.3wt.%である、
Cu:0.30~0.45wt.%、
Co:0.50~1.0wt.%、
Ti:0.10~0.20wt.%、
B:0.92~0.96wt.%、
wt.%とは、前記R-T-B系永久磁石材料における質量百分率を意味する、
ことを特徴とする請求項1に記載のR-T-B系永久磁石材料。
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