JP6340131B1 - 熱間補修用吹付材 - Google Patents
熱間補修用吹付材 Download PDFInfo
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Abstract
Description
なお、本発明において「熱間補修」とは、被補修面の温度が概ね600℃以上の状態における補修のことをいう。
マグネシア質原料を65質量%以上95質量%以下、フェノール樹脂を0.5質量%以上10質量%以下含有する熱間補修用吹付材であって、
この熱間補修用吹付材100質量%中に占める割合で、粒径20μm未満のマグネシア質原料の含有量が5質量%以上30質量%以下、粒径20μm未満のフェノール樹脂の含有量が0.3質量%以上9質量%以下であり、
「前記粒径20μm未満のマグネシア質原料の含有量/前記粒径20μm未満のフェノール樹脂の含有量」が0.6以上30以下である熱間補修用吹付材。
マグネシア質原料の含有量が65質量%未満であると耐食性(耐スラグ浸透性)等の耐用性が低下する。マグネシア質原料の含有量が95質量%を超えると、相対的にフェノール樹脂の含有量が少なくなり付着性が低下する。
また、フェノール樹脂の含有量が0.5質量%未満であるとカーボンボンドを形成する効果が弱くなり付着性が低下する。フェノール樹脂の含有量が10質量%を超えると、フェノール樹脂からの揮発が多いため吹付施工体の組織がポーラスになり、吹付施工体強度が低下する。
なお、本発明でいう「マグネシア質原料」とはMgO含有量が60質量%以上のものをいい、天然のマグネシア原料のほか、マグネシアれんがやマグネシア・カーボンれんがの屑も含むものである。
また、本発明でいう「粒径」とは篩目のことであり、例えば粒径20μm未満とは20μmの篩目を通過したものをいう。
各例の吹付材を、慣用の乾式吹付機を用い、約1000℃に熱したマグネシア・カーボンれんがの垂直面(被補修面)に吹き付け、吹付施工体を形成した。施工水の添加量は、吹付材100質量%に対する外掛けで20〜40質量%とした。
付着性は、被補修面への吹付材の付着割合で評価し、吹付材の使用量に対する被補修面への付着量の割合が80質量%以上の場合を〇(良)、60質量%以上80質量%未満の場合を△(可)、60質量%未満の場合を×(不可)とした。
吹付施工体から切り出した所定寸法の試料を、回転侵食試験機を用い、C/S=3.4の転炉スラグと鋼片とを侵食剤として、1650〜1700℃で5時間侵食させた。各例の最大溶損量を測定しかつその逆数を求め、実施例1のその逆数を100とした相対値を求めた。この相対値が大きいほど耐食性に優れるということである。耐食性の評価では、この相対値が80以上の場合を〇(良)、70以上80未満の場合を△(可)、70未満を×(不可)とした。
吹付施工体から切り出した所定寸法の試料について、JISR2575に従い常温での圧縮強度を測定し、実施例1の圧縮強度を100とした相対値を求めた。この相対値が大きいほど吹付施工体強度が高いということである。吹付施工体強度の評価では、この相対値が80以上の場合を〇(良)、70以上80未満の場合を△(可)、70未満を×(不可)とした。
吹付時に乾式吹付機のノズル先端を目視観察し、脈動なく吐出している場合を〇(良)、脈動がある場合を×(不可)とした。
前記各評価項目の評価が全て○の場合を○(良)、△が1〜3つであってその他が〇の場合を△(可)、いずれか1つが×の場合を×(不可)とした。
比較例2はマグネシア質原料の含有量が多い例である。相対的にフェノール樹脂の含有量が少なくなり、十分な吹付施工体が得られないほどに付着性が低下した。そのため耐食性及び吹付施工体強度を評価するための試料が取れなかった。
比較例4は粒径20μm未満のマグネシア質原料の含有量が多い例である。凝集効果が過大になってしまい、吹付施工時の吐出性が悪化し、その結果、十分な吹付施工体が得られないほどに付着性が低下した。そのため耐食性及び吹付施工体強度を評価するための試料が取れなかった。
比較例6はフェノール樹脂の含有量が多く、含有量比が低い(粒径20μm未満のフェノール樹脂の含有量が多い)例である。フェノール樹脂の揮発速度が速くなり、また粒径20μm未満のフェノール樹脂が吹付施工時に発塵により浮遊してしまい、結果として付着性が低下した。
Claims (3)
- マグネシア質原料を65質量%以上95質量%以下、フェノール樹脂を0.5質量%以上10質量%以下含有する熱間補修用吹付材であって、
この熱間補修用吹付材100質量%中に占める割合で、粒径20μm未満のマグネシア質原料の含有量が5質量%以上30質量%以下、粒径20μm未満のフェノール樹脂の含有量が0.3質量%以上9質量%以下であり、
「前記粒径20μm未満のマグネシア質原料の含有量/前記粒径20μm未満のフェノール樹脂の含有量」が0.6以上30以下である熱間補修用吹付材。 - 前記熱間補修用吹付材100質量%中に占める割合で、ピッチを0.5質量%以上10質量%以下含有する請求項1に記載の熱間補修用吹付材。
- 「前記粒径20μm未満のマグネシア質原料の含有量/前記粒径20μm未満のフェノール樹脂の含有量」が0.6以上20以下である請求項1又は2に記載の熱間補修用吹付材。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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JP2017253586A JP6340131B1 (ja) | 2017-12-28 | 2017-12-28 | 熱間補修用吹付材 |
EP18895424.2A EP3733631B1 (en) | 2017-12-28 | 2018-12-10 | Spraying material for hot repair |
AU2018394519A AU2018394519B2 (en) | 2017-12-28 | 2018-12-10 | Spray material for hot repair |
CN201880052866.3A CN111032596B (zh) | 2017-12-28 | 2018-12-10 | 热修补用喷涂材料 |
PCT/JP2018/045271 WO2019131082A1 (ja) | 2017-12-28 | 2018-12-10 | 熱間補修用吹付材 |
ES18895424T ES2988274T3 (es) | 2017-12-28 | 2018-12-10 | Material de pulverización para reparación en caliente |
PL18895424.2T PL3733631T3 (pl) | 2017-12-28 | 2018-12-10 | Materiał natryskowy do napraw na gorąco |
TW107145440A TWI697469B (zh) | 2017-12-28 | 2018-12-17 | 熱間修補用噴射材 |
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JP2019119622A JP2019119622A (ja) | 2019-07-22 |
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AU (1) | AU2018394519B2 (ja) |
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Citations (6)
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JP2007182337A (ja) * | 2006-01-05 | 2007-07-19 | Kurosaki Harima Corp | 低カーボン質マグネシアカーボンれんが |
JP2008151425A (ja) * | 2006-12-18 | 2008-07-03 | Kurosaki Harima Corp | マグネシアカーボンれんがの補修方法 |
JP2010235340A (ja) * | 2009-03-30 | 2010-10-21 | Kurosaki Harima Corp | 熱間補修用水系吹付材 |
JP2015196177A (ja) * | 2014-04-01 | 2015-11-09 | 黒崎播磨株式会社 | ドライコーティング材 |
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JPS54155105A (en) * | 1978-05-29 | 1979-12-06 | Shinagawa Refract Co Ltd | Converter repairing method by hot spraying |
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TW201936549A (zh) | 2019-09-16 |
ES2988274T3 (es) | 2024-11-19 |
CN111032596A (zh) | 2020-04-17 |
AU2018394519A1 (en) | 2020-05-14 |
PL3733631T3 (pl) | 2024-11-25 |
EP3733631A4 (en) | 2021-09-22 |
TWI697469B (zh) | 2020-07-01 |
WO2019131082A1 (ja) | 2019-07-04 |
EP3733631A1 (en) | 2020-11-04 |
AU2018394519B2 (en) | 2020-12-10 |
EP3733631C0 (en) | 2024-08-07 |
JP2019119622A (ja) | 2019-07-22 |
CN111032596B (zh) | 2022-05-06 |
EP3733631B1 (en) | 2024-08-07 |
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