JP5630962B2 - 亜酸化ニオブ、亜酸化ニオブの製造方法ならびに亜酸化ニオブを含有するアノードを有するキャパシタ - Google Patents
亜酸化ニオブ、亜酸化ニオブの製造方法ならびに亜酸化ニオブを含有するアノードを有するキャパシタ Download PDFInfo
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Description
C=(F・ε)/(d・VF)
上記式中、Fはキャパシタ表面積を表し、εは誘電率を表し、dは化成電圧のVあたりの絶縁層の厚さを表し、かつVFは化成電圧を表す。誘電率εは五酸化タンタルまたは五酸化ニオブに関してそれぞれ27.6または41であるが、しかし化成電圧dのボルトあたりの膜厚における成長は16.6または25Å/Vであるので、いずれの五酸化物もそれぞれほぼ同じ比ε/d=1.64または1.69を有する。従って両方の五酸化物をベースとするキャパシタは、アノード構造が同じ形状寸法であれば、同じ静電容量を有する。質量に対する比静電容量に関する詳細における些細な違いは、Nb、NbOx(0.7<x<1.3、特に0.95<x<1.1)およびTaの異なった密度により生じる。従ってNbおよびNbOxから製造されるアノード構造は、たとえば1グラムの軽量化も優先される移動電話において使用される場合に軽量化の利点を有する。コストの側面に関してNbOxはNbよりも好ましい。というのもアノード構造の体積の幾分かは酸素によるものだからである。
2Nb2O5+3Nb→5NbO (1)
従ってこの方法は高純度の市販の五酸化ニオブを使用し、かつ該ニオブを高純度のニオブ金属と、いずれも粉末形で理論量に相応させて混合し、かつこれらを、有利には水素を10%まで含有する水素含有雰囲気下で800〜1600℃で数時間処理することを含む。五酸化物および金属の両方にとって、酸素平衡が行われた後で、1μm以下またはわずかにこれを上回る(最小の)断面寸法の所望の一次粒径に相応する一次粒径を有することが有利である。
NbO2+Nb→2NbO (2)
により記載される亜酸化ニオブを製造する。
a)二酸化ニオブNbOyの製造
メッシュ幅300μmのふるいに通過させ、直径約0.7μmの一次粒径およびBET(ASTM D3663)により測定して2.4m2/gの比表面積を有する部分的に凝集した、高純度の球形の五酸化ニオブを使用した。
a)で得られた二酸化ニオブの部を反応器中のニオブワイヤのメッシュの上に装入した。二酸化物の酸素含有率に対して理論量の1.1倍のマグネシウムを炉中のメッシュの下に装入した。反応器をアルゴンで下から上へとパージした。次いで反応器を1050℃に加熱した。8時間後に反応器を冷却し、かつ空気をゆっくり導入して金属表面を不動態化した。
b)で得られたニオブ粉末43質量部およびa)で得られた二酸化ニオブ粉末57質量部を混合し、かつるつぼに導入して縁まで満たした。次いでるつぼを、アルゴン85体積%および水素15体積%からなる気体混合物によりパージされる炉中で2.5時間かけて1380℃に加熱した。
そのつどc)による亜酸化ニオブ粉末103mgを、ニオブ接触ワイヤを取り囲むようにプレス成形金型へ導入し、次いでプレス成形して2.8g/cm3の圧縮密度を有するプレス成形体を形成した。
a)二酸化ニオブNbOyの製造:
使用される出発材料は、<300μmまでふるいをかけた後にBET(ASTM D3663)により測定して2.3m2の比表面積を有する、部分的に凝集させた、高純度の実質的に球形のNb2O5であった。このNb2O5の部を水素流下に60分間で1000℃から1450℃へと上昇する温度で組成NbO2.02の酸化物へと還元させ、かつ次いで1450℃で200分間維持した。二酸化物の比表面積は0.32m2/gであり、かつレーザー回折(ASTM B822)により測定した粒径分布は67μmのD10値、176μmのD50値および284μmのD90値を有していた。
a)で製造した二酸化ニオブの部を反応器中のワイヤメッシュ上に装入し、かつ該ワイヤメッシュの下に理論量の1.2倍(二酸化ニオブのO含有率に対する)のマグネシウムを含有するるつぼをおいた。次いで反応器をアルゴン流下に4時間、900℃に加熱し、この期間の間にマグネシウムを気化させ、かつその上の二酸化ニオブを金属ニオブへと還元した。冷却および不動態化の後、硫酸次いで水により繰り返し洗浄することによって、形成された酸化マグネシウムを形成されたニオブ金属から除去した。
1.従来技術による方法:
b)で製造されるニオブ金属の半分を質量比1:0.95でa)に記載したNb2O5と混合し、かつ次いで炉中で67ミリバール絶対の水素分圧下に3時間、1400℃に加熱した。次いで粉末をメッシュ幅300μmのふるいに通過させた。この方法で得られた亜酸化ニオブ(「粉末A」)は、組成NbO1.01および0.95〜1.1μmの一次粒径(SEM画像から目視で測定)を有していた。比表面積は1.07m2/gであり、かつレーザー回折により測定したD10値は71μm、D50値は165μmおよびD90値は263μmであった。
b)で製造したニオブ金属の残りの半分を質量比1:1.34でa)で製造したNbO2.02の部と混合し、かつ次いで炉中で67ミリバール絶対の水素分圧下に2時間、1210℃に加熱した。得られた亜酸化ニオブ(「粉末B」)は組成NbO0.98および1.13m2/gの比表面積を有していた。SEM画像から目視により測定した一次粒径は平均して1.0μmであり、かつレーザー回折から測定した粒径分布によりD10値は62μm、D50値は158μmおよびD90値は269μmであった。
粉末A:65s/25g、
粉末B:26s/25g。
Claims (4)
- 出発材料である式NbOy[式中、1.8<y<2.1]の二酸化ニオブと、理論量のニオブ金属とを水素の存在下で反応させることによる、式NbOx[式中、0.7<x<1.3]の亜酸化ニオブの製造方法であって、前記二酸化ニオブNbOyを、水素流中での五酸化ニオブの還元により製造し、かつ反応を50〜1100ミリバールの水素分圧で行うことを特徴とする前記方法。
- 水素流が水蒸気不含になるまで前記反応を実施することを特徴とする、請求項1記載の方法。
- ASTM B213により40s/25g超60s/25g以下の流動性を有する、式NbOx[式中、0.7<x<1.3]の亜酸化ニオブ。
- 請求項3記載の亜酸化ニオブの粉末を焼結することにより得られるアノードを有するキャパシタ。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10333156.5 | 2003-07-22 | ||
DE2003133156 DE10333156A1 (de) | 2003-07-22 | 2003-07-22 | Verfahren zur Herstellung von Niobsuboxid |
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ZA200405851B (en) | 2005-09-28 |
JP2009143804A (ja) | 2009-07-02 |
PT1508550E (pt) | 2009-05-22 |
TWI355424B (en) | 2012-01-01 |
AU2004203208A1 (en) | 2005-02-10 |
CN1576234A (zh) | 2005-02-09 |
RU2363660C2 (ru) | 2009-08-10 |
KR101129764B1 (ko) | 2012-03-26 |
US20050019581A1 (en) | 2005-01-27 |
US20090242853A1 (en) | 2009-10-01 |
JP4317091B2 (ja) | 2009-08-19 |
EP2078699A1 (de) | 2009-07-15 |
TW200516157A (en) | 2005-05-16 |
CN100404428C (zh) | 2008-07-23 |
AU2004203208B2 (en) | 2009-07-23 |
JP2005041774A (ja) | 2005-02-17 |
PH12008000260A1 (en) | 2006-03-07 |
DE10333156A1 (de) | 2005-02-24 |
KR20050011700A (ko) | 2005-01-29 |
DE502004009299D1 (de) | 2009-05-20 |
BRPI0402986A (pt) | 2005-05-24 |
RU2004122053A (ru) | 2006-01-27 |
US7341705B2 (en) | 2008-03-11 |
IL163104A (en) | 2007-10-31 |
CN101298340A (zh) | 2008-11-05 |
EP1508550A1 (de) | 2005-02-23 |
EP1508550B1 (de) | 2009-04-08 |
MXPA04007024A (es) | 2005-03-23 |
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LAPS | Cancellation because of no payment of annual fees |