JP2009137808A - 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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- 239000011823 monolithic refractory Substances 0.000 title abstract 3
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 238000004898 kneading Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 3
- 229910052878 cordierite Inorganic materials 0.000 abstract description 20
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 abstract description 20
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract description 12
- 238000002407 reforming Methods 0.000 abstract description 2
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- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
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- 239000011819 refractory material Substances 0.000 description 2
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 206010013642 Drooling Diseases 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 208000008630 Sialorrhea Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
【解決手段】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、水およびアルミナゾルまたはシリカゾル溶液からなる溶媒とを混練して不定形耐火物とした。
【選択図】図1
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、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 (4)
- 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セラミックス粉末と、水および非晶質コロイド溶液からなる溶媒とを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。
- 非晶質コロイド溶液のシリカ含有量が、10〜70%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。
- 非晶質コロイド溶液のアルミナ含有量が、10〜70%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。
- 非晶質コロイド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2または3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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Cited By (4)
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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 |
JP2013199427A (ja) * | 2007-08-30 | 2013-10-03 | Vesuvius Crucible Co | 鋳造体、キャスタブル組成物、及びそれらの製造方法 |
US8975537B2 (en) | 2009-09-28 | 2015-03-10 | Kyocera Corporation | Circuit substrate, laminated board and laminated sheet |
JP2016069218A (ja) * | 2014-09-30 | 2016-05-09 | 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 |
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JP6470866B1 (ja) * | 2018-10-22 | 2019-02-13 | 黒崎播磨株式会社 | 熱間充填材 |
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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 |
CN102550139A (zh) * | 2009-09-28 | 2012-07-04 | 京瓷株式会社 | 结构体及其制造方法 |
US8975537B2 (en) | 2009-09-28 | 2015-03-10 | Kyocera Corporation | Circuit substrate, laminated board and laminated sheet |
JP5734860B2 (ja) * | 2009-09-28 | 2015-06-17 | 京セラ株式会社 | 構造体およびその製造方法 |
JP2016069218A (ja) * | 2014-09-30 | 2016-05-09 | 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 |
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US7833923B2 (en) | 2010-11-16 |
US20090149311A1 (en) | 2009-06-11 |
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