JP2019119622A - 熱間補修用吹付材 - Google Patents
熱間補修用吹付材 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 52
- 239000007921 spray Substances 0.000 title claims abstract description 38
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000005011 phenolic resin Substances 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 43
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 34
- 239000004604 Blowing Agent Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 23
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 20
- 229920001568 phenolic resin Polymers 0.000 abstract description 20
- 238000005507 spraying Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 description 27
- 239000000843 powder Substances 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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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%以下含有し、
かつ、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。
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。
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%以下含有し、
かつ、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。 - 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。
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