CN110246649B - 软磁性金属粉末、压粉磁芯及磁性部件 - Google Patents
软磁性金属粉末、压粉磁芯及磁性部件 Download PDFInfo
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Abstract
本发明涉及一种软磁性金属粉末，其特征在于，所述软磁性金属粉末含有多个包含Fe的软磁性金属颗粒，软磁性金属颗粒的表面被绝缘性的包覆部覆盖，包覆部含有软磁性金属微粒。
Description
技术领域
本发明涉及一种软磁性金属粉末、压粉磁芯及磁性部件。
背景技术
作为用于各种电子设备的电源电路的磁性部件，已知有变压器、扼流线圈、电感器等。
这样的磁性部件具有在发挥预定的磁特性的磁芯(铁芯)的周围或内部配置有作为电导体的线圈(绕组)的结构。
作为用于电感器等的磁性部件所具备的磁芯的磁性材料，可以列举含有铁(Fe)的软磁性金属材料。磁芯通过例如对包含由含有Fe的软磁性金属构成的颗粒的软磁性金属粉末进行压缩成型，能够作为压粉磁芯而得到。
这样的压粉磁芯中，为了提高磁特性而提高磁性成分的比例(填充率)。但是，软磁性金属的绝缘性较低，因此，如果软磁性金属颗粒彼此接触，则在向磁性部件施加电压时，接触的颗粒间流通的电流(颗粒间涡电流)所引起的损耗较大，其结果，存在压粉磁芯的铁芯损耗变大的问题。
因此，为了抑制这样的涡电流，在软磁性金属颗粒的表面形成绝缘被膜。例如，专利文献1公开了使含有磷(P)的氧化物的粉末玻璃通过机械摩擦而软化，并使之附着于Fe系非晶质合金粉末的表面，由此形成绝缘涂层。
现有技术文献
专利文献
专利文献1：日本特开2015-132010号公报
发明内容
发明所要解决的课题
但是，绝缘涂层为非磁性，因此，当绝缘涂层的厚度变大时，压粉磁芯中，有助于磁特性的成分的比例变少。其结果，存在导致预定的磁特性、例如导磁率的降低的问题。
另一方面，存在当绝缘涂层的厚度不充分时，容易发生介质击穿，耐电压性恶化的问题。
本发明是鉴于这种实际状况而研发的，其目的在于提供一种能够兼顾耐电压性和磁特性的压粉磁芯、具备该压粉磁芯的磁性部件及适于该压粉磁芯的软磁性金属粉末。
用于解决课题的方案
本发明人等发现，通过充分地确保形成于软磁性金属颗粒的外侧的绝缘涂层的厚度，且使绝缘涂层的内部含有磁性成分，从而能够兼顾压粉磁芯的耐电压性和磁特性，至此完成本发明。
即，本发明的实施方式中，
[1]一种软磁性金属粉末，其特征在于，所述软磁性金属粉末含有多个包含Fe的软磁性金属颗粒，
软磁性金属颗粒的表面被绝缘性的包覆部覆盖，
包覆部含有软磁性金属微粒。
[2]如[1]所述的软磁性金属粉末，其特征在于，包覆部含有选自P、Si、Bi及Zn中的一种以上的元素的化合物作为主成分。
[3]如[1]或[2]所述的软磁性金属粉末，其特征在于，软磁性金属微粒的长径比为1:2～1:10000。
[4]如[1]～[3]中任一项所述的软磁性金属粉末，其特征在于，包覆部的厚度为1nm以上100nm以下。
[5]如[1]～[4]中任一项所述的软磁性金属粉末，其特征在于，软磁性金属颗粒含有晶质，平均微晶直径为1nm以上50nm以下。
[6]如[1]～[4]中任一项所述的软磁性金属粉末，其特征在于，软磁性金属颗粒为非晶质。
[7]一种压粉磁芯，其由[1]～[6]中任一项所述的软磁性金属粉末构成。
[8]一种磁性部件，其具备[7]所述的压粉磁芯。
发明的效果
根据本发明，能够提供一种能够兼顾耐电压性和磁特性的压粉磁芯、具备该压粉磁芯的磁性部件及适于该压粉磁芯的软磁性金属粉末。
附图说明
图1是构成本实施方式的软磁性金属粉末的包覆颗粒的截面示意图。
图2是将图1所示的II部分放大的放大截面示意图。
图3是表示为了形成包覆部而使用的粉末包覆装置的结构的截面示意图。
图4是本发明的实施例中包覆颗粒的包覆部附近的STEM-EELS光谱图像。
符号的说明：
1…包覆颗粒
2…软磁性金属颗粒
10…包覆部
20…软磁性金属微粒
具体实施方式
以下，基于附图所示的具体的实施方式，通过以下的顺序详细地说明本发明。
1.软磁性金属粉末
1.1.软磁性金属颗粒
1.2.包覆部
1.2.1.包含软磁性金属微粒的包覆部
1.2.2.其它的结构
2.压粉磁芯
3.磁性部件
4.压粉磁芯的制造方法
4.1.软磁性金属粉末的制造方法
4.2.压粉磁芯的制造方法
(1.软磁性金属粉末)
如图1所示，本实施方式的软磁性金属粉末含有多个在软磁性金属颗粒2的表面形成有包覆部10的包覆颗粒1。在将软磁性金属粉末中包含的颗粒的个数比例设为100％的情况下，包覆颗粒的个数比例优选为90％以上，优选为95％以上。此外，软磁性金属颗粒2的形状没有特别限制，但通常为球形。
另外，本实施方式的软磁性金属粉末的平均粒径(D50)只要根据用途及材质选择即可。本实施方式中，平均粒径(D50)优选为0.3～100μm的范围内。通过将软磁性金属粉末的平均粒径设为上述的范围内，容易维持充分的成型性或预定的磁特性。作为平均粒径的测定方法，没有特别限制，优选使用激光衍射散射法。
(1.1.软磁性金属颗粒)
本实施方式中，软磁性金属颗粒的材质只要是含有Fe且呈现软磁性的材料，就没有特别限制。是由于本实施方式的软磁性金属粉末实现的效果主要是后述的包覆部引起的，软磁性金属颗粒的材质的贡献较小。
作为含有Fe且呈现软磁性的材料，可以列举：纯铁、Fe系合金、Fe-Si系合金、Fe-Al系合金、Fe-Ni系合金、Fe-Si-Al系合金、Fe-Si-Cr系合金、Fe-Ni-Si-Co系合金、Fe系非晶合金、Fe系纳米晶合金等。
Fe系非晶合金是构成合金的原子的排列为随机且作为合金整体不具有结晶性的非晶质合金。作为Fe系非晶合金，例如可以列举Fe-Si-B系、Fe-Si-B-Cr-C系等。
Fe系纳米晶合金是通过对Fe系非晶合金、或具有初始微晶存在于非晶质中的纳米异质结构的Fe系合金进行热处理，从而在非晶质中析出了纳米级的微晶的合金。
本实施方式中，由Fe系纳米晶合金构成的软磁性金属颗粒的平均微晶直径优选为1nm以上50nm以下，更优选为5nm以上30nm以下。通过平均微晶直径为上述的范围内，在软磁性金属颗粒形成包覆部时，即使对该颗粒施加应力，也能够抑制矫顽力的增加。
作为Fe系纳米晶合金，例如可以列举Fe-Nb-B系、Fe-Si-Nb-B-Cu系、Fe-Si-P-B-Cu系等。
另外，本实施方式中，软磁性金属粉末可以仅含有材质相同的软磁性金属颗粒，也可以混合存在材质不同的软磁性金属颗粒。例如，软磁性金属粉末也可以是多个Fe系合金颗粒与多个Fe-Si系合金颗粒的混合物。
此外，不同的材质可以列举：构成金属或合金的元素不同的情况；即使构成的元素相同，其组成也不同的情况；晶系不同的情况等。
(1.2.包覆部)
如图1所示，包覆部10以覆盖软磁性金属颗粒2的表面的方式形成。本实施方式中，表面被物质包覆是指该物质以与表面接触且覆盖接触的部分的方式被固定的实施方式。另外，包覆软磁性金属颗粒或包覆部的表面的包覆部只要覆盖颗粒的表面的至少一部分即可，但优选覆盖表面的全部。另外，包覆部可以连续地覆盖颗粒的表面，也可以间断地覆盖。
(1.2.1.含有软磁性金属微粒的包覆部)
包覆部10如果是能够将构成软磁性金属粉末的软磁性金属颗粒彼此绝缘那样的结构，则没有特别限制。本实施方式中，包覆部10优选含有选自P、Si、Bi及Zn中的一种以上的元素的化合物。另外，该化合物更优选为氧化物，特别优选为氧化物玻璃。
另外，选自P、Si、Bi及Zn中的一种以上的元素的化合物优选在包覆部10中作为主成分而含有。“含有选自P、Si、Bi及Zn中的一种以上的元素的氧化物作为主成分”是指在包覆部10中包含的元素中除去氧的元素的合计量设为100质量％的情况下，选自P、Si、Bi及Zn中的一种以上的元素的合计量最多。另外，本实施方式中，这些元素的合计量优选为50质量％以上，更优选为60质量％以上。
作为氧化物玻璃，没有特别限定，例如可以列举：磷酸盐(P2O5)系玻璃、铋酸盐(Bi2O3)系玻璃、硼硅酸盐(B2O3-SiO2)系玻璃等。
作为P2O5系玻璃，优选为含有50wt％以上的P2O5的玻璃，可以列举P2O5-ZnO-R2O-Al2O3系玻璃等。此外，“R”表示碱金属。
作为Bi2O3系玻璃，优选为含有50wt％以上的Bi2O3的玻璃，可以列举Bi2O3-ZnO-B2O3-SiO2系玻璃等。
作为B2O3-SiO2系玻璃，优选为含有10wt％以上的B2O3且含有10wt％以上的SiO2的玻璃，可以列举BaO-ZnO-B2O3-SiO2-Al2O3系玻璃等。
通过具有这样的包覆部，包覆颗粒显示较高的绝缘性，因此，由含有包覆颗粒的软磁性金属粉末构成的压粉磁芯的电阻率提高。
本实施方式中，如图2所示，在包覆部10的内部存在软磁性金属微粒20。通过包覆颗粒1中，在作为最外层的包覆部10的内部存在呈现软磁性的微颗粒，从而即使在增大包覆部的厚度的情况下、即提高压粉磁芯的绝缘性的情况下，也能够抑制压粉磁芯的导磁率的降低。因此，能够兼顾压粉磁芯的耐电压性和磁特性。
另外，软磁性金属微粒20优选短径方向SD比包覆颗粒1的周向CD更接近径向RD，长径方向LD比包覆颗粒的径向RD更接近周向CD。通过以这种形式存在，在本实施方式的软磁性金属粉末被压粉成型时，即使对各包覆颗粒作用压力，软磁性金属微粒20也能够分散压力，因此，即使存在软磁性金属微粒20，也能够抑制包覆部10的破坏，并维持压粉磁芯的绝缘性。
另外，根据软磁性金属微粒20的短径和长径算出的长径比(短径:长径)优选为1:2～1:10000。另外，长径比更优选为1:2以上，进一步优选为1:10以上。另一方面，更优选为1:1000以下，进一步优选为1:100以下。通过使软磁性金属微粒20的形状保持各向异性，通过软磁性金属微粒20的磁通不会集中于1点，而在表面上分散，因此，能够抑制粉末在接触点的磁饱和，其结果，压粉磁芯的直流叠加特性变得良好。此外，对于软磁性金属微粒20的长径，如果软磁性金属微粒20存在于包覆部10的内部，则没有特别限制，但例如为10nm以上1000nm以下。
作为软磁性金属微粒20的材质，如果是呈现软磁性的金属，则没有特别限制。具体而言，可以列举：Fe、Fe-Co系合金、Fe-Ni-Cr系合金等。另外，可以与形成包覆部10的软磁性金属颗粒2的材质相同，也可以不同。
本实施方式中，在将软磁性金属粉末中包含的包覆颗粒1的个数比例设为100％的情况下，在包覆部10的内部存在软磁性金属微粒20的包覆颗粒1的个数比例没有特别限制，但例如优选为50％以上100％以下。
包覆部中包含的成分能够根据通过使用了扫描透射电子显微镜(ScanningTransmission Electron Microscope：STEM)等透射电子显微镜(Transmission ElectronMicroscope：TEM)的能量色散X射线光谱法(Energy Dispersive X-ray Spectroscopy：EDS)进行的元素分析、利用电子能量损失能谱法(Electron Energy Loss Spectroscopy：EELS)进行的元素分析、TEM图像的高速傅立叶变换(Fast Fourier Transform：FFT)解析等而得到的晶格常数等的信息来进行鉴定。
包覆部10的厚度只要可以得到上述的效果就没有特别限制。本实施方式中，优选为5nm以上200nm以下。另外，优选为150nm以下，更优选为50nm以下。
(1.2.2.其它的结构)
在包覆部10中含有选自P、Si、Bi及Zn中的一种以上的元素的化合物的情况下，也可以在软磁性金属颗粒2与包覆部10之间形成其它的包覆部(包覆部A)。作为这样的包覆部A，例如优选含有Fe的氧化物作为主成分。另外，Fe的氧化物优选为致密的氧化物。
另外，在包覆部10含有P的化合物的情况下，也可以在软磁性金属颗粒2与包覆部10之间形成其它的包覆部(包覆部B)。作为这样的包覆部B，例如优选含有选自Cu、W、Mo及Cr中的一种以上的元素。即，优选这些元素作为金属单质存在。
在软磁性金属颗粒2与包覆部10之间形成上述的包覆部A或包覆部B的情况下，能够抑制构成软磁性金属颗粒2的Fe向包覆部10移动而与包覆部10内的成分反应。其结果，不仅能够兼顾压粉磁芯的耐电压性和磁特性，还能够提高压粉磁芯的耐热性。
(2.压粉磁芯)
本实施方式的压粉磁芯如果以由上述的软磁性金属粉末构成且具有预定的形状的方式形成，则没有特别限制。本实施方式中，包含软磁性金属粉末和作为粘合剂的树脂，构成该软磁性金属粉末的软磁性金属颗粒彼此经由树脂粘合，由此，被固定成预定的形状。另外，该压粉磁芯也可以由上述的软磁性金属粉末与其它磁性粉末的混合粉末构成，并形成为预定的形状。
(3.磁性部件)
本实施方式的磁性部件如果具备上述的压粉磁芯则没有特别限制。例如，可以是在预定形状的压粉磁芯内部埋设有卷绕了电线的空芯线圈的磁性部件，也可以是电线在预定形状的压粉磁芯的表面卷绕预定的匝数而成的磁性部件。本实施方式的磁性部件适于用于电源电路的功率电感器。
(4.压粉磁芯的制造方法)
接着，说明制造上述的磁性部件具备的压粉磁芯的方法。首先，说明制造构成压粉磁芯的软磁性金属粉末的方法。
(4.1.软磁性金属粉末的制造方法)
本实施方式中，形成包覆部之前的软磁性金属粉末能够使用与公知的软磁性金属粉末的制造方法同样的方法而得到。具体而言，能够使用气体雾化法、水雾化法、旋转圆盘法等制造。另外，也可以将通过单辊法等得到的薄带机械地粉碎而制造。这些方法中，从容易得到具有期望的磁特性的软磁性金属粉末的观点来看，优选使用气体雾化法。
气体雾化法中，首先，得到构成软磁性金属粉末的软磁性金属的原料熔融的熔液。准备软磁性金属中包含的各金属元素的原料(纯金属等)，以成为最终得到的软磁性金属的组成的方式称重，将该原料熔融。此外，将金属元素的原料熔融的方法没有特别限制，例如可以列举在雾化装置的腔室内抽真空之后以高频加热使之熔融的方法。熔融时的温度只要考虑各金属元素的熔点进行决定即可，例如能够设为1200～1500℃。
将得到的熔液通过设置于坩埚底部的喷嘴，作为线状的连续的流体供给至腔室内，向供给的熔液吹附高压的气体，将熔液液滴化，并且骤冷，从而得到微细的粉末。气体喷射温度、腔室内的压力等只要根据软磁性金属的组成决定即可。另外，关于粒径，可以通过进行筛分分级或气流分级等而粒度调整。
接着，相对于得到的软磁性金属颗粒形成包覆部。作为形成包覆部的方法，没有特别限制，能够采用公知的方法。可以对于软磁性金属颗粒进行湿式处理并形成包覆部，也可以进行干式处理而形成包覆部。
本实施方式中，能够通过利用了机械化学的涂布方法、磷酸盐处理法、溶胶凝胶法等形成。利用了机械化学的涂布方法中，例如，使用图3所示的粉末包覆装置100。将软磁性金属粉末、构成包覆部的材质(P、Si、Bi、Zn的化合物等)的粉末状涂布材料和软磁性金属微粒的混合粉末投入到粉末包覆装置的容器101内。投入后，通过使容器101旋转，软磁性金属粉末与混合粉末的混合物50在研磨机102与容器101的内壁之间被压缩且产生摩擦，并产生热。由于该产生的摩擦热，粉末状涂布材料软化，将软磁性金属微粒包含于其内部，且通过压缩作用固着于软磁性金属颗粒的表面，能够形成在内部含有软磁性金属微粒的包覆部。
利用了机械化学的涂布方法中，通过调整容器的转速、研磨机与容器的内壁之间的距离等，能够控制产生的摩擦热，并控制软磁性金属粉末与混合粉末的混合物的温度。本实施方式中，该温度优选为50℃以上150℃以下。通过设为这样的温度范围，容易以包覆部覆盖软磁性金属颗粒的表面的方式形成。
此外，软磁性金属微粒相对于粉末状涂布材料与软磁性金属微粒的混合粉末100wt％的比例优选设为0.00001～0.5wt％左右。
(4.2.压粉磁芯的制造方法)
压粉磁芯使用上述的软磁性金属粉末进行制造。作为具体的制造方法，没有特别限制，能够采用公知的方法。首先，将含有形成有包覆部的软磁性金属颗粒的软磁性金属粉末、和作为粘合剂的公知的树脂混合，得到混合物。另外，也可以根据需要将得到的混合物制成造粒粉。然后，将混合物或造粒粉填充于模具内进行压缩成型，得到应制作的具有压粉磁芯的形状的成型体。通过对于得到的成型体，以例如50～200℃进行热处理，树脂固化，可以得到软磁性金属颗粒经由树脂被固定的预定形状的压粉磁芯。通过向得到的压粉磁芯将电线卷绕预定次数，可以得到电感器等的磁性部件。
另外，也可以将上述的混合物或造粒粉和使电线以预定次数卷绕而形成的空芯线圈填充于模具内并进行压缩成型，得到线圈埋设于内部的成型体。对于得到的成型体，通过进行热处理，可以得到埋设有线圈的预定形状的压粉磁芯。这样的压粉磁芯在其内部埋设有线圈，因此，作为电感器等的磁性部件发挥作用。
以上，说明了本发明的实施方式，但本发明不被上述的实施方式作任何限定，也可以在本发明的范围内以各种方式进行改变。
实施例
以下，使用实施例更详细地说明发明，但本发明不限定于这些实施例。
(实验例1～66)
首先，准备含有由具有表1及2所示的组成的软磁性金属构成的颗粒，且平均粒径D50为表1及2所示的值的粉末。将准备的粉末与具有表1及2所示的组成的粉末玻璃(涂布材料)和具有表1及2所示的组成及尺寸的软磁性金属微粒一起投入粉体包覆装置的容器内，将粉末玻璃涂布于软磁性金属颗粒的表面，形成包覆部，由此，得到了软磁性金属粉末。
粉末玻璃的添加量相对于该粉末100wt％设为0.5wt％。另外，软磁性金属微粒的添加量相对于该粉末100wt％设为0.01wt％。
另外，本实施例中，作为磷酸盐系玻璃的P2O5-ZnO-R2O-Al2O3系粉末玻璃中，P2O5为50wt％，ZnO为12wt％，R2O为20wt％，Al2O3为6wt％，剩余部分为副成分。
此外，本发明人等对具有P2O5为60wt％、ZnO为20wt％、R2O为10wt％、Al2O3为5wt％且剩余部分为副成分的组成的玻璃；具有P2O5为60wt％、ZnO为20wt％、R2O为10wt％、Al2O3为5wt％且剩余部分为副成分的组成的玻璃等也进行同样的实验，并确认可以得到与后述的结果同样的结果。
另外，本实施例中，作为铋酸盐系玻璃的Bi2O3-ZnO-B2O3-SiO2系粉末玻璃中，Bi2O3为80wt％，ZnO为10wt％，B2O3为5wt％，SiO2为5wt％。对作为铋酸盐系玻璃具有其它组成的玻璃也进行同样的实验，并确认可以得到与后述的结果同样的结果。
另外，本实施例中，作为硼硅酸盐系玻璃的BaO-ZnO-B2O3-SiO2-Al2O3系粉末玻璃中，BaO为8wt％，ZnO为23wt％，B2O3为19wt％，SiO2为16wt％，Al2O3为6wt％，剩余部分为副成分。对作为硼硅酸盐系玻璃的具有其它组成的玻璃也进行同样的实验，并确认可以得到与后述的结果同样的结果。
制作的软磁性金属粉末中，对于实验例18的试样，通过STEM得到包覆颗粒的包覆部附近的明场图像。将得到的明场图像在图4中表示。另外，图4所示的明场图像中进行EELS的光谱分析，进行元素映射。根据图4所示的明场图像及元素映射的结果能够确认，在包覆部的内部存在组成为Fe且长径比为1:10的软磁性金属微粒。
接着，使用得到的软磁性金属粉末制作压粉磁芯。称重作为热固化树脂的环氧树脂及作为固化剂的酰亚胺树脂，添加于丙酮中进行溶液化，将该溶液与软磁性金属粉末混合。混合后，将使丙酮挥发而得到的颗粒利用355μm的筛网整粒。将其填充于外径11mm、内径6.5mm的环形的模具中，以成型压3.0t/cm2加压，得到压粉磁芯的成型体。将得到的压粉磁芯的成型体以180℃使树脂固化1小时，得到压粉磁芯。
此外，环氧树脂及酰亚胺树脂的总量根据压粉磁芯中软磁性金属粉末所占的填充率进行调整。填充率以压粉磁芯的导磁率(μ0)成为27～28的方式调整。
对于制作的压粉磁芯的试样，测定导磁率(μ0)及导磁率(μ8k)。另外，算出测得的μ8k相对于μ0的比。该比表示直流电流施加于压粉磁芯时的导磁率的降低率。因此，该比表示直流叠加特性，该比越接近1，则表示直流叠加特性越良好。将结果在表1及2中表示。
[表1]
[表2]
根据表1及2能够确认，通过在包覆部内部存在具有预定的长径比的软磁性金属微粒，从而压粉磁芯的导磁率及直流叠加特性提高。换而言之，能够维持压粉磁芯的导磁率及直流叠加特性等的磁特性，并且可靠地确保颗粒间的绝缘性。
(实验例67～108)
除了对于粉末将包覆部的厚度及软磁性金属微粒的有无设为表3所示的结构以外，与实验例1～66同样地制作软磁性金属粉末。除了使用制作的软磁性金属粉末，将树脂相对于粉末100wt％的量设为3wt％以外，与实验例1～66同样地制作压粉磁芯的试样。对于制作的压粉磁芯，与实验例1～66同样地评价导磁率(μ0)。
另外，在压粉磁芯的试样的上下使用源表施加电压，将流通1mA的电流时的电压值除以电极间距离的值设为耐电压。本实施例中，软磁性金属粉末的组成、平均粒径(D50)及形成压粉磁芯时使用的树脂量相同的试样中，将呈现比成为比较例的试样的耐电压高的耐电压的试样设为良好。是由于耐电压由于树脂量的不同而变化。将结果在表3中表示。
[表3]
根据表3能够确认，通过将包覆部的厚度设为预定的范围内，能够兼顾压粉磁芯的磁特性和耐电压性。另外，能够确认，通过在包覆部内部存在具有预定的长径比的软磁性金属微粒，从而即使在包覆部的厚度较大的情况下，压粉磁芯的直流叠加特性也不会降低。
(实验例109～136)
准备含有由具有表4所示的组成的软磁性金属构成的颗粒，且平均粒径D50为表4所示的值的粉末，与实验例1～66同样地，使用具有表4所示的组成的涂布材料形成包覆部。此外，对于粉末玻璃量，相对于粉末100wt％，在该粉末的平均粒径(D50)为3μm以下的情况下设定成3wt％，在该粉末的平均粒径(D50)为5μm以上10μm以下的情况下设定成1wt％，在该粉末的平均粒径(D50)为20μm以上的情况下设定成0.5wt％。是由于为了形成预定的厚度所需要的粉末玻璃量根据形成包覆部的软磁性金属粉末的粒径而不同。
本实施例中，对形成包覆部之前的粉末和形成包覆部之后的粉末测定矫顽力。就矫顽力而言，向
的塑料壳体放入20mg的粉末和石蜡，使石蜡熔融、凝固，将固定有粉末的石蜡使用东北特殊钢制造的矫顽力计(K-HC1000型)进行测定。测定磁场设为150kA/m。另外，算出形成包覆部的前后的矫顽力的比。将结果在表4中表示。
另外，对于形成包覆部之前的粉末，进行X射线衍射，算出平均微晶直径。将结果在表4中表示。此外，实验例116～120的试样为非晶系，因此，不进行微晶直径的测定。
[表4]
根据表4能够确认到，在平均微晶直径为上述的范围内的情况下，在包覆部的形成前后，粉末的矫顽力不会增加太多。
Claims (7)
1.一种软磁性金属粉末，其特征在于，
所述软磁性金属粉末含有多个包含Fe的软磁性金属颗粒，
所述软磁性金属颗粒的表面被绝缘性的包覆部覆盖，
所述包覆部在内部含有软磁性金属微粒，
所述包覆部的厚度为1nm以上200nm以下。
2.根据权利要求1所述的软磁性金属粉末，其特征在于，
所述包覆部含有选自P、Si、Bi及Zn中的一种以上的元素的化合物作为主成分。
3.根据权利要求1或2所述的软磁性金属粉末，其特征在于，
所述软磁性金属微粒的长径比为1:2～1:10000。
4.根据权利要求1或2所述的软磁性金属粉末，其特征在于，
所述软磁性金属颗粒含有晶质，平均微晶直径为1nm以上50nm以下。
5.根据权利要求1或2所述的软磁性金属粉末，其特征在于，
所述软磁性金属颗粒为非晶质。
6.一种压粉磁芯，其中，
由权利要求1～5中任一项所述的软磁性金属粉末构成。
7.一种磁性部件，其中，
具备权利要求6所述的压粉磁芯。
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