TWI654321B - 合金粉末及磁性零件 - Google Patents

合金粉末及磁性零件

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TWI654321B
TWI654321B TW104123179A TW104123179A TWI654321B TW I654321 B TWI654321 B TW I654321B TW 104123179 A TW104123179 A TW 104123179A TW 104123179 A TW104123179 A TW 104123179A TW I654321 B TWI654321 B TW I654321B
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牧野彰宏
西山信行
帕曼那德 沙瑪
竹中佳生
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日商東北磁材研究所股份有限公司
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Abstract

本發明提供具有非晶相作為為主相之組成式Fe100-a-b-c-d-e-f Coa Bb Sic Pd Cue Cf 的合金粉末。參數滿足以下條件:3.5≦a≦4.5at%;6≦b≦15at%;2≦c≦11at%;3≦d≦5at%;0.5≦e≦1.1at%;0≦f≦2at%。若具有該組成,即使90μm之粒徑大的粉末也可變得具有良好的磁性特性,故產率提升。

Description

合金粉末及磁性零件
本發明係關於可使用於感應器及噪音濾波器、抗流圈等電子零件之Fe基非晶合金粉末。
專利文獻1提出一種具有非晶相作為主相之合金粉末。專利文獻1之合金粉末的平均粒徑為0.7μm以上5.0μm以下。 【先前技術文獻】 【專利文獻】
【專利文獻1】日本特開2013-55182號公報
【發明所欲解決的問題】
若考慮對於在如噪音濾波器及抗流圈之電子零件的使用,相較於馬達用途,飽和磁通密度較小也可,另一方面,保磁力小、抑制鐵損耗使較低為必要。為了滿足此要求,且安定的得到粒徑大的粉末,要求提高合金的非晶形成能力。若由非晶形成能力高的合金製造粉末,可提升特性良好之粉末形成的產率。
因此,本發明之目的在於提供一種具有高非晶形成能力之合金粉末。 【解決問題之方式】
本發明於一態樣提供具有非晶相或非晶相與α-Fe之結晶相之混相組織作為主相之組成式Fe100-a-b-c-d-e-f Coa Bb Sic Pd Cue Cf 的合金粉末。參數滿足以下條件:3.5≦a≦4.5at%、6≦b≦15at%、2≦c≦11at%、3≦d≦5at%、0.5≦e≦1.1at%、0≦f≦2at%。又,合金粉末的粒徑為90μm以下。
又,本發明於另一態樣提供使用上述合金粉末構成的磁性零件。 【發明的效果】
含有3.5at%以上且4.5at%以下之Co之FeCoBSiPCu合金或FeCoBSiPCuC合金,具有高非晶形成能力,可輕易地得到大粒徑的合金粉末。又,由於Fe的比例降低,不適於奈米結晶化,另一方面也具有在作為保磁力小、鐵損耗低之電子零件用的優異磁性特性。即使是粒徑大的粉末也變得具有良好的磁性特性,故產率提升。
關於本發明可以多樣的變形及各種態樣實現,其中一例,以特定實施態樣,詳細說明如下。實施態樣不限於本發明在此所揭示之特定態樣,其對象包含附加之申請專利範圍所揭示之範圍內的全部變形例、均等物、替代例。
本發明之實施態樣的合金粉末,適合作為如噪音濾波器的電子零件用,組成式為Fe100-a-b-c-d-e-f Coa Bb Sic Pd Cue Cf 。在此,3.5≦a≦4.5at%、6≦b≦15at%、2<c≦11at%、3≦d≦5at%、0.5≦e≦1.1at%、0≦f≦2at%。即,不含C時,組成式為Fe100-a-b-c-d-e Coa Bb Sic Pd Cue ,含有C為0<f≦2at%時,組成式為Fe100-a-b-c-d-e-f Coa Bb Sic Pd Cue Cf
於本實施形態,Co元素為負責非晶相形成的必要元素。若對於FeBSiPCu合金或FeBSiPCuC合金添加一定量的Co元素,FeBSiPCu合金或FeBSiPCuC合金之非晶相形成能力提升,故可安定製作粒徑大之合金粉末。惟,Co之比例若較3.5 at%少,液體急速冷凍條件下之非晶相之形成能力降低,其結果,化合物相析出到合金粉末中而飽和磁通密度降低。而Co之比例若較4.5at%多,則導致保磁力上升。因此,Co的比例較佳為3.5at%以上、4.5at%以下。非晶相形成能力提高,故即使在Co的比例多到3.5at%以上的情況,藉由將其他元素B、Si、P、Cu的値調整如下述,可得到良好的磁性特性。
於本實施形態,B元素為負責非晶相形成的必要元素。B的比例若較6at%少,則液體急速冷凍條件下之非晶相形成能力降低,其結果,化合物相析出到合金粉末中而飽和磁通密度降低且同時保磁力上升。B的比例若較15at%多,則飽和磁通密度降低。因此,B的比例較理想為6at%以上、15at%以下。
於本實施形態,Si元素為負責非晶形成的必要元素。Si的比例若較2at%少,則液體急速冷凍條件下之非晶相形成能力降低,其結果,化合物相析出到合金粉末中而飽和磁通密度降低且同時保磁力提高。Si之比例若較11at%多,則導致保磁力上升。因此,Si的比例較理想為2at%以上、11at%以下。
於本實施形態,P元素為負責非晶形成之必要元素。P之比例若較3at%少,則液體急速冷凍條件下之非晶相的形成能力降低,其結果,化合物相析出到合金粉末中而保磁力上升。P之比例若較5at%多,飽和磁通密度降低。因此,P的比例較理想為3at%以上、5at%以下。
於本實施形態,Cu元素為負責非晶形成之必要元素。Cu之比例若較0.5at%少,飽和磁通密度降低。Cu之比例若較1.1at%多,液體急速冷凍條件下之非晶相形成能力降低,其結果,化合物相析出到合金粉末中而飽和磁通密度降低且同時保磁力上升。因此,Cu之比例較理想為0.5at%以上、1.1at%以下。
於本實施形態,Fe元素為主元素,佔上述組成式的剩餘部分且為負責磁性的必要元素。為了提升飽和磁通密度及降低原料價格,Fe之比例多基本上較佳。然而,Fe之比例若超過83.5at%,化合物相多量析出,飽和磁通密度極端降低的情況變多。又,Fe之比例若超過79at%,由於非晶形成能力降低而有保磁力增加的傾向,為了避免此情況有必要將半金屬元素的比例嚴密地調整。因此,Fe之比例宜為83.5at%以下,又,較佳為79at%以下。
亦可對於具有上述組成式Fe100-a-b-c-d-e Coa Bb Sic Pd Cue 之合金組成物添加一定量C元素以降低合金組成物總材料成本。惟,C之比例若超過2at%,飽和磁通密度降低。因此,即使添加C元素使合金組成物之組成式為Fe100-a-b-c-d-e-f Coa Bb Sic Pd Cue Cf 的情況,C的比例較理想為2at%以下(不含0)。
本實施形態之合金粉末,可藉由水霧化法或氣體霧化法製作,也可藉由將薄帶之合金組成物粉碎而製作。
進一步,將製成之合金粉末過篩,分為粉末粒徑90μm以下者與超過90μm者。如此而得之本實施態樣之合金粉末,具有90μm以下之粒徑且具有1.6T以上之高飽和磁通密度與100A/m以下之低保磁力。
將本實施態樣之合金粉末成形,可形成卷磁芯、疊層磁芯、壓粉磁芯等磁性核心。又,使用該磁性核心,可提供如感應器及噪音濾波器、抗流圈之電子零件。 【實施例】
以下,關於本發明之實施態樣,參考多數實施例及多數比較例更詳細說明。
(實施例1~11及比較例1~10) 首先,驗證不含C之FeCoBSiPCu合金。詳細而言,秤量原料使其為如下述表1所揭示之本發明之實施例1~11及比較例1~10的合金組成,藉由高頻感應溶解處理溶解而製作母合金。將此母合金以氣體霧化法處理,得到粉末。熔融金屬(molten metal)之吐出量定為平均15g/秒以下,氣體壓力定為10MPa以上。將如此而得的粉末過篩,分為粉末粒徑90μm以下者與超過90μm者,得到實施例1~11及比較例1~10之合金粉末。合金粉末之各種飽和磁通密度Bs係使用振動樣品型磁力計(VMS)以800kA/m的磁場測定。各合金粉末之保磁力Hc係使用直流BH追蹤儀以23.9kA/m(300奧斯特)的磁場測定。測定結果如表4所示。
【表1】
【表2】
如由表2所理解般,實施例1~11之合金粉末,係具有以非晶相為主相者或具有非晶相與α-Fe之結晶相的混相組織者。相對於此,比較例1、比較例3、比較例5、比較例7及比較例10之合金粉末,含有化合物相。又,實施例1~11之合金粉末,具有100A/m以下之低保磁力且具有1.6T以上之高飽和磁通密度。相對於此,比較例1~10之合金粉末係飽和磁通密度較1.6T低,或保磁力較100A/m高很多者。如此般,藉由此發明,即使不進行熱處理使其奈米結晶化,也可實現低保磁力與高飽和磁通密度。
(實施例12~14及比較例11) 進一步驗證含C之FeCoBSiPCuC合金。詳細而言,秤量原料使其為如下述表3所揭示之本發明之實施例12~14及比較例11之合金組成,藉由高頻感應溶解處理溶解而製作母合金。將此母合金藉由氣體霧化法處理,得到粉末。熔融金屬之吐出量定為平均15g/秒以下,氣體壓力定為10MPa以上。將如此而得的粉末過篩,分為粉末粒徑90μm以下者與超過90μm者,得到實施例12~14及比較例11的合金粉末。合金粉末之各種飽和磁通密度Bs係使用振動樣品型磁力計(VMS)以800kA/m之磁場測定。各合金粉末之保磁力Hc係使用直流BH追蹤儀以23.9kA/m (300奧斯特)磁場測定。測定結果如表4所示。
【表3】
【表4】
由表4所理解般,實施例12~14之合金粉末具有非晶相為主相或具有非晶相與α-Fe之結晶相的混相組織。又,實施例12~14之合金粉末,具有100A/m以下之低保磁力與1.6T以上之高飽和磁通密度。相對於此,比較例11之合金粉末具有低飽和磁通密度。
本發明係以2014年7月18日向日本特許廳提申之日本專利申請第2014-147249號為基準,藉由參照其內容而成本說明書的一部分。
已說明本發明之最佳實施態樣,然而該領域中有通常知識者可知在不脫離本發明之精神的範圍能將實施形態變形,如此的實施態樣屬於本發明之範圍內。

Claims (10)

  1. 一種合金粉末,具有非晶相或非晶相與α-Fe之結晶相的混相組織作為主相,組成式為Fe100-a-b-c-d-e-fCoaBbSicPdCueCf,係3.5≦a≦4.5at%、6≦b≦15at%、2≦c≦11at%、3≦d≦5at%、0.5≦e≦1.1at%、0≦f≦2at%,且Fe結晶化度為25%以下、粒徑90μm以下之合金粉末。
  2. 如申請專利範圍第1項之合金粉末,其中,70≦100-a-b-c-d-e-f≦83.5at%。
  3. 如申請專利範圍第1項之合金粉末,其中,70≦100-a-b-c-d-e-f≦79at%。
  4. 如申請專利範圍第1項之合金粉末,具有1.6T以上之飽和磁通密度與100A/m以下之保磁力。
  5. 如申請專利範圍第1項之合金粉末,其中,2<c≦11at%,且該Fe結晶化度未達23%。
  6. 如申請專利範圍第1項之合金粉末,其中,6≦b<10at%。
  7. 如申請專利範圍第1項之合金粉末,其中,0.5≦e≦1at%。
  8. 如申請專利範圍第1項之合金粉末,其中,該Fe結晶化度為21%以下。
  9. 如申請專利範圍第1項之合金粉末,未進行用以使其奈米結晶化之熱處理。
  10. 一種磁性零件,係使用如申請專利範圍第1至9項中任一項之合金粉末構成。
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