JP2006510562A - 重セラミック成形品、その製造方法および使用 - Google Patents
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Abstract
Description
たとえば、クロム鉱または合成スピネルを用いて、8〜12GPa(ギガパスカル)の範囲の実用的なG−モジュラスを特徴とするマグネシアクロマイトれんがまたはマグネシアスピネルれんがが製造される。
溶融して得られた鉄スピネルまたは溶融して得られたジルコニアを弾性材として含む耐火れんがは弾性は低いが、他方、延性を有している。G−モジュラスはおよそ15〜20GPaで相対的に高すぎる。
本発明によれば塩基性耐火材として焼結マグネシアまたは溶融マグネシアあるいはその両方、及び焼結ドロマまたは溶融ドロマあるいはその両方が ― 公知の多数の耐火材から選択されて ― 使用される。弾性材としては、酸化カルシウム[CaO]/酸化アルミニウム[Al203]−比が0.14〜0.2、特に化学組成がCaAl12O19で、酸化物式CaO・6Al2O3ないし一般式CA6のアルミン酸カルシウムが選ばれた。
ヘキサアルミン酸カルシウムは化学式CaAl12O19ないし鉱物名“イボナイト[Hibonit]”および酸化物式CaO・6Al2O3ないし一般式CA6を有する。
最大粒径4mmで、典型的なフーラー曲線に一致した粒度分布を有するマグネシアと、0.5〜4mmの分級粒子鉱物のヘキサアルミン酸カルシウムとが混合されて、結合剤としての所要量のリグニンスルホン酸塩と混和され、れんがに成形されて130MPaの単位プレス圧で締め固められた。110℃で乾燥させた後、れんがはトンネル窯で1600℃の焼結温度で焼成された。
以下の表2は焼成されたれんがによって得られた特性をヘキサアルミン酸カルシウムの添加量の関数として挙げたものである。比較のため、同様にして焼成されたマグネシアれんがの特性との対照が行なわれた。
非常に良好なれんがの弾性化を結果するメカニズムはこれまでのところ一義的に決定することはできないが、おそらく、これら双方の材料の熱膨張率の相違に起因する、れんが焼成時のマグネシア母材とヘキサアルミン酸カルシウムとの間の微小亀裂形成によるものと思われる。
本発明による成形品は激しい温度変化が生ずるとともに機械的および熱機械的応力が発生する至るところに好適に使用することができる。これはたとえば、れんが−および製陶工業、特にセメント−、石灰−、ドロマイト−およびマグネサイト工業、製鋼および非鉄金属工業などにおけるロータリキルンの焼結/移行ゾーンならびに鉄鋼業および非鉄工業などの溶融/処理槽である。本発明による成形品は耐水和性、耐アルカリ性、耐レドックス性および耐腐食性の点で卓越した使用特性を示すと同時に優れたコンパウンド形成傾向を有している。本発明による成形品は同時に、使用後の処理・処分性に問題がないことによっても公知の製品を凌駕している。
Claims (28)
- 少なくとも1つの塩基性耐火材成分と弾性材成分とからなる焼成塩基性耐火重セラミック成形品であって、
前記弾性材成分は酸化カルシウム[CaO]/酸化アルミニウム[Al2O3]−比が0.14〜0.2で、特に化学式がCaAl12O19のアルミン酸カルシウムであることを特徴とする成形品。 - 前記弾性材成分は酸化物式CaO・6Al2O3ないし一般式CA6を有することを特徴とする請求項1に記載の成形品。
- 前記弾性材成分は10質量%までの副次相を含有することを特徴とする請求項1または2に記載の成形品。
- 前記弾性材成分は、副次相として、二酸化ケイ素[SiO2]、二酸化チタン[TiO2]、酸化第二鉄[Fe2O3]、酸化マグネシウム[MgO]から選択された1つまたは複数のものを含有することを特徴とする請求項3に記載の成形品。
- 前記弾性材成分中で、58質量%までの酸化アルミニウム[Al2O3]が酸化第二鉄[Fe2O3]によって置換されていることを特徴とする請求項1から4のいずれか1項に記載の成形品。
- 前記弾性材成分中で、カルシウムイオン[Ca2+]がバリウムイオン[Ba2+]またはストロンチウムイオン[Sr2+]あるいはその両方によって一部置換されていることを特徴とする請求項1から5のいずれか1項に記載の成形品。
- 前記耐火材成分は、焼結マグネシア[MgO]、溶融マグネシア、焼結ドロマ、溶融ドロマから選択された1つまたは複数のものであることを特徴とする請求項1から6のいずれか1項に記載の成形品。
- 60〜99.5質量%の耐火材成分と0.5〜40重量%の弾性材成分とからなることを特徴とする請求項1から7のいずれか1項に記載の成形品。
- 少なくとももう1つの、それ自体公知の弾性材が含有されていることを特徴とする請求項1から8のいずれか1項に記載の成形品。
- 嵩密度は2.5〜3.2g/cm3であることを特徴とする請求項1から9のいずれか1項に記載の成形品。
- 空隙率は12〜25体積%、特に14〜23体積%であることを特徴とする請求項1から10のいずれか1項に記載の成形品。
- 常温圧縮強さは35MPa以上、特に45MPa以上であり、常温曲げ強さは2MPa以上であることを特徴とする請求項1から11のいずれか1項に記載の成形品。
- E−モジュラスは14〜35、特に15〜32GPaであり、G−モジュラスは6〜15、特に7〜14GPaであることを特徴とする請求項1から12のいずれか1項に記載の成形品。
- 温度変化耐性は>80であることを特徴とする請求項1から13のいずれか1項に記載の成形品。
- 請求項1から14のいずれか1項に記載の成形品を製造する方法であって、
少なくとも1つの耐火材成分は少なくとも1つのCA6−弾性材成分と混合され、該混合物は結合剤と混和されて十分に混錬されて成形材料とされ、続いて該成形材料は成形されて成形物とされ、該成形物は乾燥され、その後に高温で焼結されて焼成成形品とされる方法。 - 結合剤としてリグニンスルホン酸塩が使用されることを特徴とする請求項15に記載の方法。
- 最大粒径4mmで、フーラー曲線に一致した粒度分布を有する耐火材成分が使用されることを特徴とする請求項15または16に記載の方法。
- 分級粒子0.5〜4mmの弾性材成分が使用されることを特徴とする請求項15から17のいずれか1項に記載の方法。
- 100〜120℃の温度で乾燥させられることを特徴とする請求項15から18のいずれか1項に記載の方法。
- 1400〜1700℃、特に1550〜1650℃の温度で焼結されることを特徴とする請求項15から19のいずれか1項に記載の方法。
- 60〜99.5質量%の耐火材成分と0.5〜40質量%の弾性材成分とが使用されることを特徴とする請求項15から20のいずれか1項に記載の方法。
- 少なくとも1つの予備合成された弾性材成分が使用されることを特徴とする請求項15から21のいずれか1項に記載の方法。
- 当該原料から混合されて粒状化された弾性材成分用混合物が、耐火材成分と混合され、焼成中に弾性材成分が生成されることを特徴とする請求項15から22のいずれか1項に記載の方法。
- 耐火材母材と弾性材成分との間に微小亀裂形成が行なわれるようにして焼成されることを特徴とする請求項15から23のいずれか1項に記載の方法。
- 請求項15から24までのいずれか1項に記載の方法によって製造された、請求項1から14のいずれか1項に記載の成形品のロータリキルン内張りへの使用。
- 前記成形品は前記ロータリキルンの焼結ゾーンに配置されることを特徴とする請求項25に記載の使用。
- 前記成形品は前記ロータリキルンの下方移行ゾーンに配置されることを特徴とする請求項25または26に記載の使用。
- 前記成形品はセメントロータリキルンに配置されることを特徴とする請求項25から27のいずれか1項に記載の使用。
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DE10259826A DE10259826B4 (de) | 2002-12-19 | 2002-12-19 | Grobkeramischer Formkörper, Verfahren zu dessen Herstellung und Verwendung |
PCT/EP2003/010808 WO2004056718A2 (de) | 2002-12-19 | 2003-09-29 | Grobkeramischer formkörper, verfahren zu dessen herstellung und verwendung |
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JP2016131987A (ja) * | 2015-01-16 | 2016-07-25 | 新日鐵住金株式会社 | Ca処理鋼用スライディングノズルプレート |
CN108218192A (zh) * | 2018-01-31 | 2018-06-29 | 淄博旭硝子刚玉材料有限公司 | 耐低铁玻璃侵蚀的电熔azs砖 |
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WO2008036310A2 (en) | 2006-09-21 | 2008-03-27 | Mcgowan Kenneth A | Methods of use of calcium hexa aluminate refractory linings and/or chemical barriers in high alkali or alkaline environments |
CN101838149B (zh) * | 2010-04-06 | 2011-02-09 | 东台市节能耐火材料厂 | 抗侵蚀莫来石砖制备原料和制备方法 |
US9422195B1 (en) | 2012-09-19 | 2016-08-23 | Universal Refractories, Inc. | Magnesium oxide castable refractory foundry ladle liners |
US9592548B2 (en) | 2013-01-29 | 2017-03-14 | General Electric Company | Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
CN109456069A (zh) * | 2018-11-20 | 2019-03-12 | 辽宁科技学院 | 一种致密二铝酸钙耐火熟料的制备方法 |
CN110171980A (zh) * | 2019-04-10 | 2019-08-27 | 辽宁科技学院 | 一种致密六铝酸钙耐火熟料的制备方法 |
DE102019220085A1 (de) | 2019-12-18 | 2021-06-24 | Refratechnik Holding Gmbh | Versatz zur Herstellung eines grobkeramischen feuerfesten basischen Erzeugnisses, derartiges Erzeugnis sowie Verfahren zu seiner Herstellung, Zustellung eines Industrieofens und Industrieofen |
CN111995403B (zh) * | 2020-09-04 | 2022-09-27 | 中材高新氮化物陶瓷有限公司 | 一种耐腐蚀氮化硅陶瓷及其制备方法 |
CN116003103A (zh) * | 2022-12-19 | 2023-04-25 | 齐鲁工业大学 | 一种基于黄河泥的高温陶瓷材料及其制备方法和应用 |
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JP2016131987A (ja) * | 2015-01-16 | 2016-07-25 | 新日鐵住金株式会社 | Ca処理鋼用スライディングノズルプレート |
CN108218192A (zh) * | 2018-01-31 | 2018-06-29 | 淄博旭硝子刚玉材料有限公司 | 耐低铁玻璃侵蚀的电熔azs砖 |
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BR0317335A (pt) | 2005-11-08 |
DE10259826B4 (de) | 2004-11-25 |
AT502793B1 (de) | 2007-08-15 |
KR100979594B1 (ko) | 2010-09-01 |
MXPA05005845A (es) | 2005-08-29 |
CA2510015C (en) | 2012-01-10 |
BR0317335B1 (pt) | 2012-07-24 |
CA2510015A1 (en) | 2004-07-08 |
KR20050093776A (ko) | 2005-09-23 |
WO2004056718A3 (de) | 2004-09-16 |
AT502793A5 (de) | 2007-05-15 |
WO2004056718A2 (de) | 2004-07-08 |
US7632770B2 (en) | 2009-12-15 |
JP4310277B2 (ja) | 2009-08-05 |
AU2003293589A1 (en) | 2004-07-14 |
US20060266268A1 (en) | 2006-11-30 |
DE10259826A1 (de) | 2004-07-08 |
CN1301936C (zh) | 2007-02-28 |
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