CN108962523A - 一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法 - Google Patents
一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法 Download PDFInfo
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Abstract
本发明公开了一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,属于磁性材料技术领域。本发明以1:5型SmCo纳米磁体和纳米晶α‑Fe粉复合磁体为基体,采用磁控溅射和放电等离子烧结技术,将低熔点Sm6Cu4合金作为界面相,改善晶界并扩散至硬磁相内,从而提高了磁体的矫顽力,获得了具有良好磁性能的钐钴基纳米晶复合永磁体。同时,本发明工艺简单,成本低,有利于钐钴基纳米复合永磁体在更多永磁器件中的应用。
Description
技术领域
本发明涉及磁性材料技术领域,尤其涉及一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法。
背景技术
近年来,由于在高技术领域,比如计算机、信息存储、生物医学和微纳机械等领域的潜在应用,纳米晶永磁材料的研究越来越引起了人们的重视。然而由于超顺磁效应,到了纳米尺度,一般的永磁材料的矫顽力都明显下降,只有钐钴这种高磁晶各向异性的材料才能保持一定的矫顽力。特别像SmCo5材料具有永磁材料中磁晶各向异性常数K u(2.3×108erg/cm3),因此其超顺磁极限也是最小的,达到2.2 nm,是制备纳米晶永磁材料的理想材料。
虽然SmCo5纳米晶永磁体具有较高的矫顽力,高的居里温度,但是其磁性能和钕铁硼还是有较大的差距。α-Fe铁粉为软磁相,有高剩磁的特性。本发明采用将纳米Fe粉和高能球磨后的(Sm, Ce)1(Co, Fe, Cu, Zr)5纳米粉有效复合,同时,通过磁控溅射将非磁性和低熔点的SmCu合金有效沉积在(Sm, Ce)1(Co, Fe, Cu, Zr)5纳米粉上,使纳米Fe粉和SmCo5粉在放电等离子液相烧结中,在晶界处位置形成了厚的和非磁性的边界层,有效降低了反磁化畴的形核,并使SmCu合金中的Sm形成更多的SmCo5主相,实现掺杂SmCu合金的高矫顽力和高磁性能钐钴基纳米复合永磁体的制备。
发明内容
针对现有技术中存在的问题,本发明目的在于提供一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法。
本发明的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,包括如下步骤:
1)按照(Sm, Ce)1(Co, Fe, Cu, Zr)5合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后高能球磨制成合金粉体;
2)按照Sm6Cu4合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后将熔炼好的Sm6Cu4合金锭熔化后倒入磁控溅射靶材模具中,冷却后打磨、切割,得到Sm6Cu4合金溅射靶材;
3)利用磁控溅射技术使步骤(2)制得的Sm6Cu4合金靶材镀在步骤(1)制得的(Sm, Ce)1(Co, Fe, Cu, Zr)5合金粉体上得到混合粉体;
4)将步骤(3)制得的混合粉体与纳米晶α-Fe粉按一定比例混合后,在2.0T的磁场下取向并压制成型坯件;
5)将步骤(4)制得的成型坯件进行放电等离子烧结制得掺杂SmCu合金的钐钴基纳米复合永磁体。
进一步的,步骤(1)中所述(Sm, Ce)1(Co, Fe, Cu, Zr)5合金中各元素的重量百分比为:Sm和Ce:25~35%,其中Sm与Ce的重量比为1:0.1~0.3;Co:50~65%,Fe:10~20%,Cu:5~10%,Zr:2~6%。
进一步的,步骤(1)中高能球磨的时间为2~4小时。
进一步的,步骤(3)中磁控溅射Sm6Cu4合金的工艺条件为:溅射过程中真空室真空度为5×10-3~5×10-2Pa,磁控溅射电流为15~25A,磁控溅射时间为1~2小时。
进一步的,步骤(4)中混合粉体与纳米晶α-Fe粉的重量比为1:0.01~0.1。
进一步的,步骤(5)中放电等离子烧结的具体工艺参数为:热压温度为550~700℃,压力为50~250MPa,升温速率为50~80℃/min,烧结保温时间2~8min。
与现有的技术相比,本发明具有如下优点和有益效果:本发明采用磁控溅射和放电等离子烧结技术结合,将低熔点Sm6Cu4合金扩散至1:5型SmCo纳米磁体和纳米晶α-Fe粉复合磁体内,改善晶界并扩散至硬磁相内,同时,有效促进SmCo/α-Fe纳米复合磁体在热变形过程中获得良好的织构,从而提高了磁体的矫顽力,获得了具有良好磁性能的钐钴基纳米晶复合永磁体。
具体实施方式
下面结合具体实施方式及对比例对本发明作进一步阐述。
实施例1
1)先准备原料,按以下重量比称取原料:Sm:20%,Ce:6%,Co:56%,Fe:10%,Cu:5%,Zr:3%,将原料混合后进行真空熔炼,然后进行高能球磨2小时制成合金粉体;
2)按照Sm6Cu4合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后将熔炼好的Sm6Cu4合金锭熔化后倒入磁控溅射靶材模具中,冷却后打磨、切割,得到Sm6Cu4合金溅射靶材;
3)利用磁控溅射技术使步骤(2)制得的Sm6Cu4合金靶材镀在步骤(1)制得的(Sm, Ce)1(Co, Fe, Cu, Zr)5合金粉体上得到混合粉体;所述的溅射过程中真空室真空度为8×10- 2Pa,磁控溅射电流为20A,磁控溅射时间为1小时;
4)将步骤(3)制得的混合粉体与纳米晶α-Fe粉按1:0.02的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
5)将步骤(4)制得的成型坯件进行放电等离子烧结,热压温度为550℃,压力为100MPa,升温速率为50℃/min,烧结保温时间3min,制得掺杂SmCu合金的钐钴基纳米复合永磁体。
比较例1
1)先准备原料,按以下重量比称取原料:Sm:20%,Ce:6%,Co:56%,Fe:10%,Cu:5%,Zr:3%,将原料混合后进行真空熔炼,然后进行高能球磨2小时制成合金粉体;
2)将步骤(1)制得的粉体与纳米晶α-Fe粉按1:0.02的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
3)将步骤(2)制得的成型坯件进行放电等离子烧结,热压温度为550℃,压力为100MPa,升温速率为50℃/min,烧结保温时间3min,制得钐钴基纳米复合永磁体。
实施例2
1)先准备原料,按以下重量比称取原料:Sm:25%,Ce:2.5%,Co:53.5%,Fe:11%,Cu:6%,Zr:2%,将原料混合后进行真空熔炼,然后进行高能球磨3小时制成合金粉体;
2)按照Sm6Cu4合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后将熔炼好的Sm6Cu4合金锭熔化后倒入磁控溅射靶材模具中,冷却后打磨、切割,得到Sm6Cu4合金溅射靶材;
3)利用磁控溅射技术使步骤(2)制得的Sm6Cu4合金靶材镀在步骤(1)制得的(Sm, Ce)1(Co, Fe, Cu, Zr)5合金粉体上得到混合粉体;所述的溅射过程中真空室真空度为8×10- 2Pa,磁控溅射电流为20A,磁控溅射时间为1.5小时;
4)将步骤(3)制得的混合粉体与纳米晶α-Fe粉按1:0.04的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
5)将步骤(4)制得的成型坯件进行放电等离子烧结,热压温度为570℃,压力为125MPa,升温速率为50℃/min,烧结保温时间3min,制得掺杂SmCu合金的钐钴基纳米复合永磁体。
比较例2
1)先准备原料,按以下重量比称取原料:Sm:25%,Ce:2.5%,Co:53.5%,Fe:11%,Cu:6%,Zr:2%,将原料混合后进行真空熔炼,然后进行高能球磨3小时制成合金粉体;
2)将步骤(1)制得的粉体与纳米晶α-Fe粉按1:0.04的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
3)将步骤(2)制得的成型坯件进行放电等离子烧结,热压温度为570℃,压力为125MPa,升温速率为50℃/min,烧结保温时间3min,制得钐钴基纳米复合永磁体。
实施例3
1)先准备原料,按以下重量比称取原料:Sm:27%,Ce:2.7%,Co:50.8%,Fe:11%,Cu:5.5%,Zr:3%,将原料混合后进行真空熔炼,然后进行高能球磨4小时制成合金粉体;
2)按照Sm6Cu4合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后将熔炼好的Sm6Cu4合金锭熔化后倒入磁控溅射靶材模具中,冷却后打磨、切割,得到Sm6Cu4合金溅射靶材;
3)利用磁控溅射技术使步骤(2)制得的Sm6Cu4合金靶材镀在步骤(1)制得的(Sm, Ce)1(Co, Fe, Cu, Zr)5合金粉体上得到混合粉体;所述的溅射过程中真空室真空度为8×10- 2Pa,磁控溅射电流为20A,磁控溅射时间为2小时;
4)将步骤(3)制得的混合粉体与纳米晶α-Fe粉按1:0.06的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
5)将步骤(4)制得的成型坯件进行放电等离子烧结,热压温度为600℃,压力为150MPa,升温速率为50℃/min,烧结保温时间3min,制得掺杂SmCu合金的钐钴基纳米复合永磁体。
比较例3
1)先准备原料,按以下重量比称取原料:Sm:27%,Ce:2.7%,Co:50.8%,Fe:11%,Cu:5.5%,Zr:3%,将原料混合后进行真空熔炼,然后进行高能球磨4小时制成合金粉体;
2)将步骤(1)制得的粉体与纳米晶α-Fe粉按1:0.06的重量比混合后,在2.0T的磁场下取向并压制成型坯件;
3)将步骤(2)制得的成型坯件进行放电等离子烧结,热压温度为600℃,压力为150MPa,升温速率为50℃/min,烧结保温时间3min,制得钐钴基纳米复合永磁体。
将上述实施例和比较例制备的样品,经磁性能测试,对比结果如表1所示。
总结:
本发明采用掺杂SmCu低熔点合金制备了高矫顽力的钐钴基纳米复合永磁体。相对于未掺杂SmCu低熔点合金,添加了SmCu低熔点合金的钐钴基纳米复合永磁体,虽然对磁体的剩磁影响不明显,但是矫顽力和密度都得到了明显的提升。这主要是由于低熔点SmCu合金通过磁控溅射和热压技术,有效的扩散至SmCo纳米磁体和纳米晶α-Fe粉复合磁体内,改善晶界并扩散至硬磁相内,同时,改善了扩散后磁体的晶界特性,增强了软/硬磁相之间的交换耦合作用,使磁体的矫顽力和密度都得到了明显的提升。
表1:
Claims (6)
1.一种掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于包括如下步骤:
1)按照(Sm, Ce)1(Co, Fe, Cu, Zr)5合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后高能球磨制成合金粉体;
2)按照Sm6Cu4合金成分称量各原料并进行混合,将混合原料进行真空熔炼,然后将熔炼好的Sm6Cu4合金锭熔化后倒入磁控溅射靶材模具中,冷却后打磨、切割,得到Sm6Cu4合金溅射靶材;
3)利用磁控溅射技术使步骤(2)制得的Sm6Cu4合金靶材镀在步骤(1)制得的(Sm, Ce)1(Co, Fe, Cu, Zr)5合金粉体上得到混合粉体;
4)将步骤(3)制得的混合粉体与纳米晶α-Fe粉按一定比例混合后,在2.0T的磁场下取向并压制成型坯件;
5)将步骤(4)制得的成型坯件进行放电等离子烧结制得掺杂SmCu合金的钐钴基纳米复合永磁体。
2.根据权利要求1 所述的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于:步骤(1)中所述(Sm, Ce)1(Co, Fe, Cu, Zr)5合金中各元素的重量百分比为:Sm和Ce:25~35%,其中Sm与Ce的重量比为1:0.1~0.3;Co:50~65%,Fe:10~20%,Cu:5~10%,Zr:2~6%。
3.根据权利要求1 所述的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于:步骤(1)中高能球磨的时间为2~4小时。
4.根据权利要求1 所述的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于:步骤(3)中磁控溅射Sm6Cu4合金的工艺条件为:溅射过程中真空室真空度为5×10-3~5×10-2Pa,磁控溅射电流为15~25A,磁控溅射时间为1~2小时。
5.根据权利要求1 所述的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于:步骤(4)中混合粉体与纳米晶α-Fe粉的重量比为1:0.01~0.1。
6.根据权利要求1 所述的掺杂SmCu合金的钐钴基纳米复合永磁体的制备方法,其特征在于:步骤(5)中放电等离子烧结的具体工艺参数为:热压温度为550~700℃,压力为50~250MPa,升温速率为50~80℃/min,烧结保温时间2~8min。
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