JP4469391B2 - 低膨張、高強度、耐クラック伸展性を有する不定形耐火物 - Google Patents
低膨張、高強度、耐クラック伸展性を有する不定形耐火物 Download PDFInfo
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Description
特許文献1に示されるように、粒径2mm以上の骨材とポルトランドセメントなどを配合した超高じん性モルタルが提案されているが、高強度は達成できるものの低膨張、耐クラック進展性は改善することができないものであった。
また、特許文献3に示されるように、セラミックス製品の表面を改質するためのコート材としてコージライト粉末と水からなるものが提案されているが、低膨張、高強度は達成できるものの、耐クラック伸展性は改善することができないものであった。
本発明では、低膨張性を確保するためにコージライト材料を用いる。コージライトの熱膨張係数は、900℃で1.6〜2.0×10−6と低いため、低膨張のセラミックス製品の表面に適用した場合に、膨張率の差が小さく割れ等の発生を防止でき、またコージライト自身がクラックを発生しにくい材質であり、不定形耐火物のクラック発生を防ぐことができる。
また、コージライト粉末はメジアン径が10〜50μmの範囲のものとする。メジアン径を管理することで、施工性、強度、耐クラック伸展性の良好なモルタルが得られるからである。メジアン径が10μm未満では溶媒の添加量が多くなって強度低下につながり、50μmより大きいと施工性は良好であるが、強度が低下してしまう。
図1に本発明のコージライト粉末の粒度分布、図2に従来技術のコージライト粉末の粒度分布を示す。メジアン径は、図1のものが16.367±5μmで、メジアン径頻度は7.5%以上であり、一方、図2のものではメジアン径が17.573μmで、メジアン径頻度は5.0%以下である。そして、本発明者の研究によれば、従来のように粒子径にバラツキのあるブロードな山形状の粒度分布では、不定形耐火物とした場合に空隙が多くなり十分な強度が得られないのに対し、本発明のように粒子径が揃っていてシャープな山形状の粒度分布の場合は、最密充填となって十分な強度が発現し、かつクラックの伸展も防止することが可能となることが判った。
なお、メジアン径頻度の上限は11%以下であることが好ましい。
従来のように、溶媒として水のみを使用した場合は、十分な強度が得られないのに対し、コロイダル状態のアルミナ又はシリカを溶媒として用いた場合は、十分な強度を得ることができることを究明したからである。
また、アルミナまたはシリカゾル溶液中のNa2OやK2O等のアルカリ酸化物含有量は、0.01%以上2%以下であることが好ましい。2%より多いと、強度が低下するからである。
比較例として、メジアン径頻度が5%以下であるブロードな山形状の粒度分布を有する従来のコージライト粉末を用いてモルタルを作成した場合の、不定形耐火物の強度、施工性、クラック発生数などを測定した結果を表1に示す。
この結果、本発明の不定形耐火物が従来例に比べて低膨張性、高強度性、耐クラック伸展性において、優れた特性を有していることが確認できた。
Claims (2)
- メジアン径が10〜50μmの範囲で、10μm未満の粒度含有量が1%以上36%以下、10μm以上50μm以下の粒度含有量が50%以上75%以下、51μm以上の粒度含有量が1%以上14%以下であるシャープな山形状の粒度分布を有するコージライト粉末と、アルミナ含有量が10〜70質量%のアルミナゾル溶液又はシリカ含有量が10〜70質量%のシリカゾル溶液からなる溶媒を、コージライト粉末100質量%に対し溶媒30〜42質量%の割合で混練したことを特徴とする低膨張、高強度、耐クラック伸展性を有する不定形耐火物。
- アルミナゾル又はシリカゾル溶液中のアルカリ酸化物含有量が、0.01%以上2%以下である請求項1に記載の低膨張、高強度、耐クラック伸展性を有する不定形耐火物。
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JP2007317900A JP4469391B2 (ja) | 2007-12-10 | 2007-12-10 | 低膨張、高強度、耐クラック伸展性を有する不定形耐火物 |
US12/035,082 US7833923B2 (en) | 2007-12-10 | 2008-02-21 | Monolithic refractory material having low expansibility, high strength, and crack extension resistance |
CN2008100828280A CN101456746B (zh) | 2007-12-10 | 2008-02-28 | 具有低膨胀性、高强度、耐裂纹扩展性的不定形耐火物 |
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JP2007317900A JP4469391B2 (ja) | 2007-12-10 | 2007-12-10 | 低膨張、高強度、耐クラック伸展性を有する不定形耐火物 |
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JP2009137808A JP2009137808A (ja) | 2009-06-25 |
JP4469391B2 true JP4469391B2 (ja) | 2010-05-26 |
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CA2844168C (en) * | 2007-08-30 | 2015-11-03 | Vesuvius Crucible Company | Cast bodies, castable compositions, and methods for their production |
WO2011037260A1 (ja) * | 2009-09-28 | 2011-03-31 | 京セラ株式会社 | 構造体およびその製造方法 |
JP5582944B2 (ja) | 2009-09-28 | 2014-09-03 | 京セラ株式会社 | 配線基板、積層板及び積層シート |
JP6398546B2 (ja) * | 2014-09-30 | 2018-10-03 | 日立金属株式会社 | セラミックハニカム構造体及びその製造方法並びにコート材 |
CN105622079B (zh) * | 2015-12-25 | 2016-10-19 | 山东硅元新型材料有限责任公司 | 分子筛膜支撑体的制备方法 |
CN106587963A (zh) * | 2016-12-27 | 2017-04-26 | 郑州源冉生物技术有限公司 | 一种膨胀系数小的高强度陶瓷及其制备方法 |
JP6470866B1 (ja) * | 2018-10-22 | 2019-02-13 | 黒崎播磨株式会社 | 熱間充填材 |
JP2022161154A (ja) * | 2021-04-08 | 2022-10-21 | 住友重機械工業株式会社 | 超伝導磁石装置およびサイクロトロン |
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JPS6024068B2 (ja) * | 1976-02-17 | 1985-06-11 | 黒崎窯業株式会社 | 耐スポ−リング性緻密質耐火物の製造方法 |
US4171227A (en) * | 1976-11-24 | 1979-10-16 | Pq Corporation | Alumina-silica binder for coating compositions |
US4724172A (en) * | 1983-12-29 | 1988-02-09 | Sermatech International, Inc. | Thick coating compositions |
JPH0288452A (ja) * | 1988-09-26 | 1990-03-28 | Nichias Corp | 耐熱性無機質成形体 |
JPH0375275A (ja) | 1989-08-11 | 1991-03-29 | Nippon Steel Corp | マグネシア質耐火モルタル |
JP2601129B2 (ja) | 1993-04-08 | 1997-04-16 | 日本碍子株式会社 | アルミナ・クロミア質キャスタブル耐火物およびそれを用いたプレキャストブロック |
US5766686A (en) * | 1996-03-01 | 1998-06-16 | North American Refractories Co. | Spray insulating coating for refractory articles |
JP2000335980A (ja) | 1999-05-31 | 2000-12-05 | Kawasaki Steel Corp | 黒鉛含有不定形耐火物 |
US7976941B2 (en) * | 1999-08-31 | 2011-07-12 | Momentive Performance Materials Inc. | Boron nitride particles of spherical geometry and process for making thereof |
JP4216174B2 (ja) * | 2003-01-09 | 2009-01-28 | 日本碍子株式会社 | コート材、セラミックスハニカム構造体及びその製造方法 |
JP2005067945A (ja) | 2003-08-22 | 2005-03-17 | Ps Mitsubishi Construction Co Ltd | 超高強度高じん性モルタル |
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US20090149311A1 (en) | 2009-06-11 |
JP2009137808A (ja) | 2009-06-25 |
CN101456746B (zh) | 2012-08-29 |
US7833923B2 (en) | 2010-11-16 |
CN101456746A (zh) | 2009-06-17 |
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