JP2019173127A - 軟磁性粉末および焼結体の製造方法 - Google Patents
軟磁性粉末および焼結体の製造方法 Download PDFInfo
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- JP2019173127A JP2019173127A JP2018064792A JP2018064792A JP2019173127A JP 2019173127 A JP2019173127 A JP 2019173127A JP 2018064792 A JP2018064792 A JP 2018064792A JP 2018064792 A JP2018064792 A JP 2018064792A JP 2019173127 A JP2019173127 A JP 2019173127A
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- magnetic powder
- sintered body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
Description
Coが47.0質量%以上52.0質量%以下の割合で含まれ、
Vが0.030質量%以上2.0質量%未満の割合で含まれ、
Siが0.10質量%以上の割合で含まれ、
Vの含有率とSiの含有率の合計が2.5質量%以下であり、
比表面積が0.15m2/g以上0.80m2/g以下であることを特徴とする。
実施形態に係る軟磁性粉末は、Feが45.0質量%以上52.0質量%以下の割合で含まれ、Coが47.0質量%以上52.0質量%以下の割合で含まれ、Vが0.030質量%以上2.0質量%未満の割合で含まれ、Siが0.10質量%以上の割合で含まれ、Vの含有率とSiの含有率の合計が2.5質量%以下であり、比表面積が0.15m2/g以上0.80m2/g以下である。
Fe(鉄)は、軟磁性粉末の基本的な磁気特性や機械的特性に大きな影響を及ぼす。
Coの含有率は、47.0質量%以上52.0質量%以下とされるが、好ましくは47.5質量%以上51.5質量%以下とされ、より好ましくは48.0質量%以上50.0質量%以下とされる。
Cr(クロム)は、主に軟磁性粉末の耐食性を高めるように作用する。
次に、実施形態に係る軟磁性粉末を用いて製造される焼結体について説明する。
次に、実施形態に係る焼結体の製造方法について説明する。
図1に示す焼結体の製造方法は、実施形態に係る軟磁性粉末と有機バインダーとを混合し、混合物を得る混合工程と、混合物を成形し、成形体を得る成形工程と、成形体を焼成し、焼結体を得る焼成工程と、を有する。以下、各工程について順次説明する。
まず、軟磁性粉末と有機バインダーとを混合し、混合物を得る。混合物としては、例えば軟磁性粉末と有機バインダーとを混練してなる混練物(コンパウンド)や、軟磁性粉末と有機バインダーとを含むスラリーを造粒してなる造粒粉末が挙げられる。
次に、得られた混練物の成形を行う。これにより、所望の形状、寸法の成形体を製造する。
なお、脱脂後の成形体に対しても、必要に応じて後加工を施すようにしてもよい。
次に、得られた成形体の焼成を行う。これにより、軟磁性粉末を焼結させ、焼結体が得られる。
次に、焼結体の適用例としてヨークケースについて説明する。
次に、ヨークケースを備えるドットインパクトプリンター(記録装置)について説明する。
1.焼結体の製造
(サンプルNo.1)
まず、水アトマイズ法により製造した表1に示す組成の軟磁性粉末を用意した。この軟磁性粉末について、レーザー回折方式の粒度分布測定装置(マイクロトラック、日機装株式会社製、HRA9320−X100)により平均粒径を測定した。測定結果を表1に示す。
<不飽和グリシジル基含有重合体>
・E−GMA−VA共重合体
・ポリスチレン(重量平均分子量10000)
・パラフィンワックス
・フタル酸ジブチル
製造条件を表1に示すように変更した以外は、それぞれ実施例1と同様にして焼結体を得た。
2.1 焼結密度の評価
各実施例および各比較例で得られた焼結体について、アルキメデス法(JIS Z 2501に規定)に準じた方法により密度を測定した。そして、測定された焼結密度と、軟磁性粉末の真密度から、焼結体の相対密度を算出した。
<相対密度の評価基準>
A:相対密度が98.0%以上である
B:相対密度が97.5%以上98.0%未満である
C:相対密度が97.0%以上97.5%未満である
D:相対密度が96.5%以上97.0%未満である
E:相対密度が96.0%以上96.5%未満である
F:相対密度が96.0%未満である。
評価結果を表1に示す。
各実施例および各比較例で得られた焼結体について、試料振動型磁力計により、飽和磁束密度を測定した。
<飽和磁束密度の評価基準>
A:飽和磁束密度が2.4T以上である
B:飽和磁束密度が2.3T以上2.4T未満である
C:飽和磁束密度が2.2T以上2.3T未満である
D:飽和磁束密度が2.1T以上2.2T未満である
E:飽和磁束密度が2.0T以上2.1T未満である
F:飽和磁束密度が2.0T未満である
評価結果を表1に示す。
各実施例および各比較例で得られた焼結体について、四端子法により、体積抵抗率を測定した。
<体積抵抗率の評価基準>
A:体積抵抗率が25μΩcm以上である
B:体積抵抗率が23μΩcm以上25μΩcm未満である
C:体積抵抗率が21μΩcm以上23μΩcm未満である
D:体積抵抗率が19μΩcm以上21μΩcm未満である
E:体積抵抗率が17μΩcm以上19μΩcm未満である
F:体積抵抗率が17μΩcm未満である
評価結果を表1に示す。
各実施例および各比較例で得られた焼結体について、以下のようにして切削抵抗を評価した。
次いで、加工ツールを走査するようにマシニングセンターで焼結体に切削加工を施した。そして、切削加工中に測定した三成分の切削抵抗のうち、最大の値を求め、以下の評価基準にしたがって評価した。
A:切削抵抗が150N以下である
B:切削抵抗が150N超200N以下である
C:切削抵抗が200N超250N以下である
D:切削抵抗が250N超300N以下である
E:切削抵抗が300N超である
評価結果を表1に示す。
各実施例および各比較例で得られた焼結体について、表面硬度を測定した。
<表面硬度の評価基準>
A:ビッカース硬度が320以上380以下である
B:ビッカース硬度が300以上320未満または380超400以下である
C:ビッカース硬度が300未満または400超である
評価結果を表1に示す。
Claims (5)
- Feが45.0質量%以上52.0質量%以下の割合で含まれ、
Coが47.0質量%以上52.0質量%以下の割合で含まれ、
Vが0.030質量%以上2.0質量%未満の割合で含まれ、
Siが0.10質量%以上の割合で含まれ、
Vの含有率とSiの含有率の合計が2.5質量%以下であり、
比表面積が0.15m2/g以上0.80m2/g以下であることを特徴とする軟磁性粉末。 - レーザー回折式粒度分布測定装置で測定された質量基準の粒度分布において、小径側から累積10%になるときの粒径をD10とし、累積50%になるときの粒径をD50と、累積90%になるときの粒径をD90とするとき、(D90−D10)/D50が1.0以上3.5以下を満たす請求項1に記載の軟磁性粉末。
- アトマイズ粉である請求項1または2に記載の軟磁性粉末。
- タップ密度が3.6g/cm3以上5.5g/cm3以下である請求項1ないし3のいずれか1項に記載の軟磁性粉末。
- 請求項1ないし4のいずれか1項に記載の軟磁性粉末と、有機バインダーと、を混合し、混合物を得る工程と、
前記混合物を成形し、成形体を得る工程と、
前記成形体を焼成し、焼結体を得る工程と、
を有することを特徴とする焼結体の製造方法。
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CN201910235950.5A CN110317975A (zh) | 2018-03-29 | 2019-03-27 | 软磁性粉末及烧结体的制造方法 |
EP19165453.2A EP3546095A1 (en) | 2018-03-29 | 2019-03-27 | Soft magnetic powder and method for producing sintered body |
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