JPH1029874A - Heat insulating castable - Google Patents
Heat insulating castableInfo
- Publication number
- JPH1029874A JPH1029874A JP8204302A JP20430296A JPH1029874A JP H1029874 A JPH1029874 A JP H1029874A JP 8204302 A JP8204302 A JP 8204302A JP 20430296 A JP20430296 A JP 20430296A JP H1029874 A JPH1029874 A JP H1029874A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- alumina
- insulating castable
- weight
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
- C04B2111/00887—Ferrous metallurgy
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は断熱キャスタブルに
関し、水硬性アルミナ及びアルミナセメントを併用する
ことにより、従来の一般的な断熱キャスタブルやセラミ
ックファイバーでは対応が困難であった鋼片圧延用熱処
理炉のビームポストのライニング材、溶鋼鋳込み時に使
用されるタンデッシュのカバー、溶鋼鍋蓋等の高温域と
なる構造物や、特に、鋼片圧延用熱処理炉のスキッド部
周辺のような振動を生じる部位への適用も可能にした断
熱キャスタブルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating castable, and more particularly to a heat-treating furnace for billet rolling, which has been difficult to handle with conventional general heat-insulating castables and ceramic fibers by using both hydraulic alumina and alumina cement. High-temperature structures such as beam post lining materials, tundish covers used when casting molten steel, and molten steel pot lids, and especially to parts that generate vibration such as around the skid part of a billet rolling heat treatment furnace The present invention relates to an insulated castable that can be applied.
【０００２】[0002]
【従来の技術】従来から、断熱キャスタブルやセラミッ
クフィバーは、高温に達する加熱炉壁等の断熱耐火性を
要する構造物に広く用いられている。断熱キャスタブル
は、一般に、アルミナ質等の耐火性骨材と軽量シャモッ
ト、パーライト等の軽量骨材との混合物に、更に結合材
としてアルミナセメントを混合した混合組成物で構成さ
れる。使用にあたっては、その混合組成物に現場で水を
加えて混練した後、対象構造物に流し込んだり、鏝塗り
したり、または吹付けて施工し所定部位に耐火性能を付
与する不定形耐火物である。また、セラミックファイバ
ーは、工業窯炉等のライニング材として知られており、
ブロック状またはフェルト状に成形され、接着バインダ
ーやセラミックスまたは金属製のアンカーピンで固定し
て施工される。上記のように従来の断熱キャスタブル
は、通常、強度特性を得るために多量のアルミナセメン
トが添加される。そのため高温域ではアルミナセメント
と耐火性骨材とが反応して低融点物質を生成して組織が
劣化することがあり、その結果、高温域で耐熱性の低下
と、それに伴う溶損による耐触性の低下を生ずるおそれ
があった。このため、従来の一般的な断熱キャスタブル
は、雰囲気炉や煙道ダクトの裏張り材等のあまり高温に
ならない部位での使用に用途が限定されていた。また、
セラミックファイバーは、低熱伝導、低熱容量という特
性を有し、省エネルギー化を図るには好適の材料である
が、対象構造物への固定作業が煩雑であり、施工性に欠
けるという問題があった。その上、セラミックファイバ
ーの飛散による周囲の環境悪化等の問題も有している。2. Description of the Related Art Conventionally, heat-insulating castables and ceramic fibers have been widely used for structures requiring heat-insulating fire resistance, such as heating furnace walls that reach high temperatures. The heat-insulating castable is generally composed of a mixture of a mixture of a refractory aggregate such as alumina and a lightweight aggregate such as lightweight chamotte and perlite, and further mixed with alumina cement as a binder. In use, after adding water at the site to the mixed composition and kneading, pour it into the target structure, apply trowel, or spray it and apply it to a predetermined part with an irregular refractory to give fire resistance is there. In addition, ceramic fiber is known as a lining material for industrial kilns,
It is formed into a block or felt shape and fixed with an adhesive binder or ceramic or metal anchor pins. As described above, a large amount of alumina cement is usually added to conventional heat-insulating castables to obtain strength properties. Therefore, in the high temperature range, the alumina cement and the refractory aggregate react with each other to form a low melting point substance, which may cause deterioration of the structure. There is a possibility that the property may be reduced. For this reason, the use of the conventional general heat-insulating castable has been limited to use in a portion where the temperature does not become very high, such as an atmosphere furnace or a lining material of a flue duct. Also,
Ceramic fibers have characteristics of low heat conduction and low heat capacity, and are suitable materials for energy saving. However, there is a problem that the work of fixing the ceramic fibers to the target structure is complicated and the workability is poor. In addition, there are also problems such as deterioration of the surrounding environment due to scattering of the ceramic fibers.
【０００３】一方、近年、鋼片圧延用熱処理炉のビーム
ポストやスキッド部周辺のライニング材や、溶鋼鋳込み
時に使用されるタンディッシュのカバー、溶鋼鍋蓋等の
高温に達する構造物にも、断熱キャスタブルが使用され
るようになっている。このため、出願人は、先に特開平
７−６９７４３号公報にて、結合材としてアルミナセメ
ントを用いることなく水硬性を有する遷移アルミナのみ
を使用した、上記鋼片圧延用熱処理炉のビームポスト等
の高温域構造物に適用可能な断熱キャスタブルを提案し
た。提案した断熱キャスタブルを用いた高温域の構造物
に対する施工体は、高温での耐熱性及び耐蝕性の向上が
著しく優れたものである。また、上記提案の断熱キャス
タブルは、水硬性の遷移アルミナを用いたことにより６
００℃〜１０００℃の中間温度域近辺で脱水作用が生じ
て強度が低くなるおそれがあり、それを防止するためマ
イクロシリカを添加含有させ、中間温度域近辺での強度
低下の防止を図っていることからも、高温域に達する構
造物への施工に対しては、極めて有用性の高いものとな
った。On the other hand, in recent years, heat-insulating materials such as lining materials around beam posts and skids in heat treatment furnaces for billet rolling, tundish covers used for casting molten steel, and lids for molten steel pots have been used. Castables are being used. For this reason, the applicant previously disclosed in Japanese Patent Application Laid-Open No. 7-69743 a beam post of a heat treatment furnace for billet rolling using only transition alumina having hydraulic properties without using alumina cement as a binder. A heat-insulating castable that can be applied to high-temperature structures in Japan was proposed. The construction body for a structure in a high-temperature region using the proposed heat-insulating castable has significantly improved heat resistance and corrosion resistance at high temperatures. In addition, the above proposed heat-insulating castable is made of hydraulically transitional alumina.
There is a possibility that dehydration may occur near the intermediate temperature range of 00 ° C. to 1000 ° C. and the strength may be reduced. To prevent this, micro silica is added and contained to prevent the strength from decreasing near the intermediate temperature range. From this, it became extremely useful for construction on structures that reach high temperatures.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記提
案の断熱キャスタブルを用いて施工した構造物における
施工体で、例えば、鋼片圧延用熱処理炉のスキッド部周
辺のような稼働時に振動が加わるような部位にある場合
には、静止状態での高温域の強度は十分であるものの、
振動によりその断熱キャスタブルによる施工体が脱落の
おそれがあることがその後の継続研究で知見された。そ
のため、発明者らは、上記提案の断熱キャスタブルに引
き続き、高温に対する耐熱性を有し、中高温域での強度
が高く、且つ、振動が生じてもそれらの耐熱性及び高強
度の優れた特性を保持できる断熱キャスタブルの提供を
目的に、更に断熱キャスタブルの組成分等について更に
研究を継続した。即ち、発明者らは、断熱キャスタブル
の組成分について再検討し、先の提案において発泡剤と
の組合せで水硬性が消失し、また、骨材との反応性のた
め組織劣化のおそれが生じるとされることから含有成分
から除外したアルミナセメント成分の見直しを行うと共
に、断熱キャスタブルを構成する組成分について種々確
認した。その結果、水硬性を有する遷移アルミナとアル
ミナセメントとを組合わせて併用し、更にマイクロシリ
カを活用することにより、水硬性の問題もなく、また高
温での耐熱性及び組織劣化もない上、中間温度域近辺で
の強度低下もない断熱キャスタブルが得られることを知
見し本発明を完成した。However, in the construction of a structure constructed by using the above-mentioned heat-insulating castables, for example, vibration may be applied during operation such as around a skid portion of a billet rolling heat treatment furnace. If it is located at a site, the strength in the high temperature region in the stationary state is sufficient,
Subsequent continuous research has found that the construction body due to the adiabatic castable may fall off due to vibration. Therefore, the inventors have succeeded in the above-mentioned proposed heat-insulating castables, have heat resistance against high temperatures, have high strength in a medium-high temperature range, and have excellent heat resistance and high strength properties even when vibration occurs. In order to provide a heat-insulating castable that can maintain the heat resistance, further research was continued on the composition of the heat-insulating castable. That is, the inventors reconsidered the composition of the heat-insulating castable, and in the previous proposal, the hydraulic property was lost in combination with the foaming agent, and the possibility of tissue deterioration due to reactivity with the aggregate occurred. Therefore, the alumina cement component excluded from the contained components was reviewed, and various components constituting the heat-insulating castable were confirmed. As a result, by using a combination of transition alumina having hydraulic property and alumina cement in combination and further utilizing microsilica, there is no problem of hydraulic property, there is no heat resistance at high temperature and there is no deterioration of structure, The inventors have found that an adiabatic castable having no strength reduction near the temperature range can be obtained, and completed the present invention.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、耐火性
骨材２５〜４５重量％、水硬性を有する遷移アルミナが
４０〜６０重量％、アルミナセメント１〜１５重量％、
マイクロシリカ５〜２５重量％、及び、セラミックファ
イバー１〜５重量％を含有することを特徴とする断熱キ
ャスタブルが提供される。また、本発明の断熱キャスタ
ブルにおいて、耐火性骨材がアルミナ質及び／またはム
ライト質の１種または２種以上であることが好ましい。According to the present invention, 25 to 45% by weight of refractory aggregate, 40 to 60% by weight of hydraulically transitional alumina, 1 to 15% by weight of alumina cement,
A heat-insulating castable is provided, comprising 5 to 25% by weight of microsilica and 1 to 5% by weight of ceramic fiber. Further, in the heat-insulating castable of the present invention, it is preferable that the refractory aggregate is one or more of alumina and / or mullite.
【０００６】本発明は上記のように構成され、所定の耐
火性骨材、水硬性を有する遷移アルミナ、アルミナセメ
ント、マイクロシリカ及びセラミックファイバーを含有
し、特に水硬性の遷移アルミナとアルミナセメントを併
存させることから、高温域での耐熱性及び耐蝕性に優れ
ることに加えて、水硬性が短時間で良好に発現され、マ
イクロシリカが施工体中に強固に固定される。そのため
６００〜１０００℃の中間温度域で強度が低下すること
がなく、且つ、振動が発生する鋼片圧延用熱処理炉のス
キッド部周辺等の高温域に用いても、組織の劣化を防止
でき、また、その施工体中からの陥落も防止することが
できる。The present invention is constituted as described above and contains a predetermined refractory aggregate, a transition alumina having a hydraulic property, an alumina cement, micro silica, and a ceramic fiber. Therefore, in addition to being excellent in heat resistance and corrosion resistance in a high temperature range, hydraulic property is well expressed in a short time, and the micro silica is firmly fixed in the construction body. Therefore, the strength does not decrease in an intermediate temperature range of 600 to 1000 ° C., and even when used in a high temperature range such as around a skid portion of a heat treatment furnace for billet rolling in which vibration occurs, deterioration of the structure can be prevented, In addition, it is possible to prevent falling from inside the construction body.
【０００７】[0007]
【発明の実施の形態】以下、本発明について詳しく説明
する。本発明の断熱キャスタブルは、耐火性骨材とし
て、好ましくはアルミナ質耐火物とムライト質耐火物の
１種または２種以上、強度向上のための水硬性を有する
遷移アルミナとアルミナセメント、マイクロシリカ及び
セラミックファイバーの各原材料を混合して構成され
る。上記原材料において、耐火性骨材の成分は特に制限
されるものでないが、耐食性と容積安定性、即ち、体積
収縮を減少させるために添加されるものであり、アルミ
ナ質及び／またはムライト質耐火物を用いることが好ま
しい。更に、これら原料アルミナ質及びムライト質耐火
物が純度８０〜９０％のものを使用することがより好ま
しい。上記原料の耐火性骨材は、粒径１ｍｍ以下の粉粒
体を使用することが好ましい。原料耐火性骨材の粉粒体
の粒径が１ｍｍ以上であると、耐火性骨材粒子の施工体
の底部に沈降するおそれがあり、均一な組織が得られな
いことがあるためである。また、体積収縮や耐食性の低
下及び熱伝導率特性にも著しく悪影響を及ぼす要因とな
り易いためである。本発明の断熱キャスタブルにおい
て、耐火性骨材の配合量は２５〜４５重量％が好まし
い。耐火性骨材の配合量が２５重量％未満では、熱によ
る体積収縮率が大きくなり施工体としての容積安定性に
欠けるおそれがあるためである。一方、配合量が４５重
量％を超えると、嵩比重が大きくなり断熱性が低下する
ためである。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The heat-insulating castable of the present invention is preferably a refractory aggregate, preferably one or more of alumina-based refractories and mullite-based refractories, transition alumina and alumina cement having hydraulic properties for improving strength, micro-silica and It is composed by mixing each raw material of ceramic fiber. In the above raw materials, the components of the refractory aggregate are not particularly limited, but are added to reduce corrosion resistance and volume stability, that is, volume shrinkage, and are made of alumina and / or mullite refractories. It is preferable to use Further, it is more preferable to use the raw material alumina and mullite refractories having a purity of 80 to 90%. It is preferable to use a granular material having a particle size of 1 mm or less as the refractory aggregate as the raw material. If the particle size of the raw material refractory aggregate is 1 mm or more, there is a possibility that the powder will settle at the bottom of the construction body of the refractory aggregate particle, and a uniform structure may not be obtained. Further, this is because it is likely to be a factor that has a significant adverse effect on volume shrinkage, reduction in corrosion resistance, and thermal conductivity characteristics. In the heat-insulating castable of the present invention, the amount of the refractory aggregate is preferably 25 to 45% by weight. If the blending amount of the refractory aggregate is less than 25% by weight, the volume shrinkage due to heat increases, and there is a possibility that the construction may lack the volume stability. On the other hand, if the compounding amount exceeds 45% by weight, the bulk specific gravity increases, and the heat insulating property decreases.
【０００８】本発明の断熱キャスタブルは、前記特開平
７−６９７４３号公報で提案の断熱キャスタブルが、強
度発現のための結合材としてアルミナ水和物の脱水転移
時に生成される水硬性を有する遷移アルミナのみを用い
るのに対し、結合材として水硬性を有する遷移アルミナ
に、少量のアルミナセメントを組合わせ併用するもので
ある。本発明の水硬性を有する遷移アルミナ（Ａｌ2 Ｏ
3 ）としては、ρ−Ａｌ2 Ｏ3 、χ−Ａｌ2 Ｏ3 、η−
Ａｌ2 Ｏ3 、γ−Ａｌ2 Ｏ3 、θ−Ａｌ2 Ｏ3等として
知られる遷移アルミナを使用することができる。これら
の遷移アルミナは、ρ−Ａｌ2 Ｏ3 に代表されるよう
に、水の添加によりバイヤライトやベーマイトゲルを生
成し、ゲル化により強度発現することが知られている。
遷移アルミナの原料であるアルミナ水和物中に含まれる
Ａｌ2 Ｏ3 量は、例えば９９％程度と非常に多い上、Ｎ
ａ2 Ｏ、Ｆｅ2 Ｏ3 等の不純物が極めて少ない。そのた
め、本発明の断熱キャスタブル中に添加されるセラミッ
クファイバーへ与える影響も小さいため好ましく、ま
た、硬化時間もアルミナセメントと同程度の時間で硬化
できる特性を有することからも好ましい。本発明の断熱
キャスタブルは、結合材として上記したように遷移アル
ミナと共にアルミナセメントが配合される。アルミナセ
メントは上記遷移アルミナと同様に水硬性であり、遷移
アルミナと併存させることにより強度特性をより向上さ
せることができる。The heat-insulating castable according to the present invention is a heat-insulating castable proposed in Japanese Patent Application Laid-Open No. 7-69743, wherein the heat-insulating castable is a transitional alumina having hydraulic properties generated during dehydration transition of alumina hydrate as a binder for developing strength. In contrast to using only a binder, a small amount of alumina cement is used in combination with a transition alumina having hydraulic properties as a binder. The transition alumina having hydraulic properties of the present invention (Al 2 O
3 ) includes ρ-Al 2 O 3 , χ-Al 2 O 3 , η-
Transition alumina known as Al 2 O 3 , γ-Al 2 O 3 , θ-Al 2 O 3 or the like can be used. It is known that these transition aluminas generate bayerite or boehmite gel by addition of water, as represented by ρ-Al 2 O 3 , and develop strength by gelation.
The amount of Al 2 O 3 contained in alumina hydrate, which is a raw material of transition alumina, is very large, for example, about 99%, and N 2
The impurities such as a 2 O and Fe 2 O 3 are extremely small. Therefore, the effect on the ceramic fiber added to the heat-insulating castable of the present invention is small, and it is preferable because the hardening time is the same as that of the alumina cement. In the heat-insulating castable of the present invention, alumina cement is mixed with transition alumina as described above as a binder. Alumina cement is hydraulic like the above-mentioned transition alumina, and when it coexists with transition alumina, the strength characteristics can be further improved.
【０００９】本発明の断熱キャスタブルにおいて上記水
硬性を有する遷移アルミナの配合量は４０〜６０重量％
の範囲内が好ましい。遷移アルミナの配合量が４０重量
％未満では機械的強度特性が著しく低下し、脱型に必要
な強度すら得られないためである。また、６０重量％よ
り多く配合すると６００〜１０００℃の中間温度域にお
いて強度低下が著しいためである。また、上記遷移アル
ミナの配合量範囲を外れた場合に生じる不都合を補うた
めに、アルミナセメントや下記するマイクロシリカを比
較的多量に添加する必要が生じ、従来の断熱キャスタブ
ルと同様に、例えば、アルミナセメントを多量に用いれ
ば、高温域での耐熱性や耐食性の低下が問題となる。従
って、アルミナセメントの配合量は１〜１５重量％で、
好ましくは３〜７重量％である。アルミナセメントの配
合量が１重量％未満であると強度の向上は認められず、
１５重量％を超えると高温域での耐熱性や耐食性に悪影
響を与え好ましくない。更に、アルミナセメントと共に
マイクロシリカを多量に添加すれば、耐熱性に悪影響を
与える結果となり好ましくない。In the heat-insulating castable of the present invention, the blending amount of the transition alumina having the above-mentioned hydraulic property is 40 to 60% by weight.
Is preferably within the range. If the blending amount of the transition alumina is less than 40% by weight, the mechanical strength characteristics are remarkably reduced, and even the strength required for demolding cannot be obtained. Further, if the content is more than 60% by weight, the strength is significantly reduced in an intermediate temperature range of 600 to 1000 ° C. In addition, in order to compensate for the inconvenience that occurs when the amount of the transition alumina is out of the range, it is necessary to add a relatively large amount of alumina cement or microsilica described below. If a large amount of cement is used, there is a problem in that heat resistance and corrosion resistance in a high temperature range are reduced. Therefore, the compounding amount of the alumina cement is 1 to 15% by weight,
Preferably it is 3 to 7% by weight. If the amount of alumina cement is less than 1% by weight, no improvement in strength is observed,
If it exceeds 15% by weight, heat resistance and corrosion resistance in a high temperature range are adversely affected, which is not preferable. Further, when a large amount of microsilica is added together with the alumina cement, heat resistance is adversely affected, which is not preferable.
【００１０】本発明の断熱キャスタブルに配合するマイ
クロシリカは、一般にフェロシリコンまたはジルコニア
の製造に伴う副産物として得られる。マイクロシリカ
は、断熱キャスタブルの流動性の向上と加熱による強度
発現に寄与する。マイクロシリカが、球形を有すること
から流動性が向上し、複雑な形状や薄肉形状の施工も容
易となる。また、前記したように、水硬性を有する遷移
アルミナは水和によりアルミナ水和物とゲルを生成して
強度を発現する一方、生成された水和物とゲルは、加熱
により脱水作用を生じ６００〜１０００℃の中間温度域
近辺で極端な強度低下を生じる。マイクロシリカは、上
記中間温度域近辺で焼結が進行するため、中間温度域で
の強度低下を防止できる。マイクロシリカの配合量は５
〜２５重量％であり、特に１０〜２０重量％が好まし
い。上記の範囲を逸脱すると、マイクロシリカを添加し
ても十分な機械的強度が得られず、また、体積収縮率が
大きくなる傾向があり好ましくない。[0010] The microsilica incorporated into the adiabatic castable of the present invention is generally obtained as a by-product accompanying the production of ferrosilicon or zirconia. Microsilica contributes to improving the fluidity of the heat-insulating castable and developing strength by heating. Since the micro-silica has a spherical shape, the fluidity is improved, and it becomes easy to construct a complicated shape or a thin shape. In addition, as described above, the transition alumina having hydraulic properties forms an alumina hydrate and a gel by hydration to exhibit strength, while the generated hydrate and gel generate a dehydration effect by heating. Extreme strength reduction occurs near the intermediate temperature range of １０００1000 ° C. Since sintering of the microsilica proceeds in the vicinity of the above-mentioned intermediate temperature range, it is possible to prevent a decrease in strength in the intermediate temperature range. The amount of micro silica is 5
To 25% by weight, and particularly preferably 10 to 20% by weight. Outside the above range, sufficient mechanical strength cannot be obtained even when microsilica is added, and the volume shrinkage tends to increase, which is not preferable.
【００１１】本発明の断熱キャスタブルにおいて、セラ
ミックファイバーは断熱性を付与するために不可欠であ
る。本発明で用いるセラミックファイバーは、得られる
断熱キャスタブルの耐熱性等の適用条件により変化する
が、通常、ムライト質成分からなるセラミックファイバ
ーが用いられる。また、セラミックファイバーは、結晶
質、非晶質のいずれであってもよく、その繊維長さや繊
維径は特に制限されず断熱材として通常用いられるもの
から適宜選択することができる。セラミックファイバー
の配合量は、１〜５重量％の範囲が好ましい。セラミッ
クファイバーの配合量が１重量％未満であると断熱性の
付与が十分に図れない。また、５重量％を超えると、キ
ャスタブルの流動性が著しく低下すると共に強度特性も
極端に低下するためである。なお、セラミックファイバ
ーは、一般にバルク状を呈するため、耐火性骨材等と均
一に混合するには、撹拌能力に優れる強力なミキサーを
使用する。In the heat-insulating castable of the present invention, ceramic fibers are indispensable for providing heat insulation. The ceramic fiber used in the present invention varies depending on application conditions such as the heat resistance of the obtained heat-insulating castable, but usually a ceramic fiber composed of a mullite component is used. The ceramic fiber may be either crystalline or amorphous, and its fiber length and fiber diameter are not particularly limited, and can be appropriately selected from those commonly used as heat insulating materials. The amount of the ceramic fiber is preferably in the range of 1 to 5% by weight. If the amount of the ceramic fiber is less than 1% by weight, sufficient heat insulation cannot be provided. On the other hand, if the content exceeds 5% by weight, the flowability of the castable is remarkably reduced, and the strength properties are extremely lowered. Since ceramic fibers generally have a bulk shape, a powerful mixer having an excellent stirring ability is used to uniformly mix with the refractory aggregate and the like.
【００１２】上記のように本発明の断熱キャスタブル
は、耐火性骨材に、結合材として水硬性アルミナと少量
のアルミナセメントを併存させ、更にマイクロシリカを
添加することによって、６００〜１０００℃の中間温度
域近辺での強度低下を防止し、高温域での強度発現と施
工性の向上を図ることができる。更に、セラミックファ
イバーの添加により、一層の断熱性を付与させるもので
ある。その結果、本発明の断熱キャスタブルは、高温域
での耐熱性、耐蝕性、機械的強度が向上し、各種用途で
の使用が可能となる。しかも、施工性に優れ、断熱施工
作業も容易となり作業性も向上する。従って、先に特開
平７−６９７４２号公報で提案した断熱キャスタブルと
同様に鋼片圧延用熱処理炉のビームポストのライニング
材、溶鋼鋳込み時に使用されるタンデッシュのカバー、
溶鋼鍋蓋等の高温域となる構造物への適用は勿論、特
に、鋼片圧延用熱処理炉のスキッド部周辺のような高熱
稼働時に振動を発生する部位にも適用しても施工体の組
織が劣化することもなく、その一部が脱落することもな
い。As described above, the heat-insulating castable according to the present invention provides a refractory aggregate in which hydraulic alumina and a small amount of alumina cement coexist as a binder, and further, microsilica is added, whereby an intermediate temperature of 600 to 1000 ° C. is obtained. It is possible to prevent a decrease in strength near the temperature range, and to achieve strength development and improvement in workability in a high temperature range. Furthermore, by adding ceramic fibers, further heat insulating properties are imparted. As a result, the heat-insulating castable of the present invention has improved heat resistance, corrosion resistance, and mechanical strength in a high temperature range, and can be used in various applications. Moreover, the workability is excellent, and the heat insulation work is facilitated and the workability is improved. Therefore, similarly to the heat-insulating castable proposed in JP-A-7-69742, the lining material of the beam post of the heat treatment furnace for billet rolling, the cover of the tundish used in casting molten steel,
The structure of the construction body can be applied not only to structures that are in the high-temperature region such as molten steel pot lids, but also to parts that generate vibration during high-heat operation, such as around the skid of a billet rolling heat treatment furnace. Is not degraded, and a part thereof is not dropped.
【００１３】[0013]
【実施例】以下、本発明を実施例に基づき更に詳細に説
明する。但し、本発明は下記実施例により制限されるも
のでない。 実施例１〜８及び比較例１〜５ 表１〜３に示した各原材料を、各表に示した重量比率で
配合混合して断熱キャスタブルを得た。得られた断熱キ
ャスタブルに、各断熱キャスタブル１００重量部に対し
各表に示した重量比率で水を添加して混練した。なお、
混合、混練ともミキサー（千代田技研工業（株）製、商
品名：オムニミキサー）を用いて行い、混合は５分間、
混練は１０分間実施した。混練して得られたスラリーを
型に流込み、約２０時間放置して硬化した。スラリーの
流動性は流込み時の良否で評価した。その後、１１０℃
で１０時間乾燥後、９００℃で３時間または１３００℃
で３時間でそれぞれ焼成した。なお、表中、各乾燥また
は焼成時間を、×１０や×３で表示した。得られた各焼
成体について、ＪＩＳ Ｒ ２５５４に準拠し、４０×
４０×１６０（ｍｍ）のテストピースの長さの加熱前後
の変化率を測定し線変化率を算出した。また、ＪＩＳ
Ｒ ２５５３に準拠して曲げ強さを測定した。それらの
結果をそれぞれ表１〜３に示した。更に、１１０℃で１
０時間乾燥後、９００℃及び１２００℃における熱間の
曲げ強さを測定して、その結果を表１〜３に示した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. However, the present invention is not limited by the following examples. Examples 1 to 8 and Comparative Examples 1 to 5 The raw materials shown in Tables 1 to 3 were blended and mixed at the weight ratios shown in the tables to obtain heat-insulating castables. Water was added to the obtained heat-insulating castables at a weight ratio shown in each table with respect to 100 parts by weight of each heat-insulating castable, and kneaded. In addition,
Both mixing and kneading were performed using a mixer (manufactured by Chiyoda Giken Kogyo Co., Ltd., trade name: omni mixer).
The kneading was performed for 10 minutes. The slurry obtained by kneading was poured into a mold and left to cure for about 20 hours. The fluidity of the slurry was evaluated by the quality at the time of pouring. Then 110 ° C
After drying at 900 ° C for 3 hours or 1300 ° C
For 3 hours. In the table, each drying or baking time is indicated by × 10 or × 3. Each of the obtained fired bodies is 40 × in accordance with JIS R 2554.
The rate of change of the length of the test piece of 40 × 160 (mm) before and after heating was measured to calculate the rate of linear change. Also, JIS
Flexural strength was measured according to R 2553. The results are shown in Tables 1 to 3, respectively. Furthermore, at 110 ° C., 1
After drying for 0 hours, the bending strength between heat at 900 ° C and 1200 ° C was measured, and the results are shown in Tables 1 to 3.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【表３】 [Table 3]
【００１７】上記実施例から明らかなように、本発明の
断熱キャスタブルは、スラリーでの流動性が良好であ
り、それにより得られた施工体である焼成体物が、いず
れも体積収縮率もほぼ所定で大きくならず、曲げ強度も
一定であることが分かる。一方、比較例１においては水
硬性を有する遷移アルミナが２５重量％であるため機械
的強度が極めて低く、また、アルミナセメントを配合し
ない比較例３においては中間温度である９００℃及び高
温域の１３００℃による焼成体の強度が低下することが
分かる。比較例２はアルミナセメントが多いため、ま
た、比較例４はマイクロシリカが多いため、それぞれ高
温での収縮率が大きいことが分かる。比較例５はセラミ
ックファイバーが多く、スラリーの流動性が悪く、ま
た、中間温度９００℃での強度が低下し、高温での収縮
率も大きくなることが分かる。As is clear from the above examples, the heat-insulating castable of the present invention has a good fluidity in a slurry, and the resulting fired product, which is a construction body, has almost the same volume shrinkage rate. It turns out that it is not large at a predetermined value and the bending strength is constant. On the other hand, in Comparative Example 1, since the transition alumina having hydraulic properties was 25% by weight, the mechanical strength was extremely low. In Comparative Example 3 in which no alumina cement was blended, the intermediate temperature was 900 ° C and 1300 in the high temperature range. It can be seen that the strength of the fired body due to ° C decreases. Comparative Example 2 has a large amount of alumina cement, and Comparative Example 4 has a large amount of microsilica. Comparative Example 5 has many ceramic fibers, poor fluidity of the slurry, reduced strength at an intermediate temperature of 900 ° C., and increased shrinkage at a high temperature.
【００１８】[0018]
【発明の効果】本発明の断熱キャスタブルは、結合材と
して遷移アルミナ及びアルミナセメントを併用すること
から、マイクロシリカを配合して６００〜１０００℃の
中間温度域近辺での強度低下がなく、且つ、高温域での
耐熱性、耐食性、機械的強度が向上し、鋼片圧延用熱処
理炉のビームポストのライニング材、溶鋼鋳込み時に使
用されるタンデッシュのカバー、溶鋼鍋蓋等の高温域と
なる構造物への適用は勿論、特に、鋼片圧延用熱処理炉
のスキッド部周辺のような高熱稼働時に振動を発生する
部位等各種用途への使用が可能である。しかも、施工性
に優れ、断熱施工作業が容易である。According to the heat-insulating castable of the present invention, since transition alumina and alumina cement are used together as a binder, there is no decrease in strength near the intermediate temperature range of 600 to 1000 ° C. by blending micro silica, and Structures that have improved heat resistance, corrosion resistance, and mechanical strength in high-temperature areas, and are high-temperature areas such as lining materials for beam posts of heat treatment furnaces for billet rolling, tundish covers used when casting molten steel, and lids for molten steel pots. Of course, it can be used for various applications such as a part that generates vibration during high-heat operation, such as around a skid portion of a heat treatment furnace for billet rolling, as well as for other applications. Moreover, the workability is excellent and the heat insulation work is easy.
Claims (2)
有する遷移アルミナが４０〜６０重量％、アルミナセメ
ント１〜１５重量％、マイクロシリカ５〜２５重量％、
及び、セラミックファイバー１〜５重量％を含有するこ
とを特徴とする断熱キャスタブル。1 to 25% by weight of refractory aggregate, 40 to 60% by weight of transition alumina having hydraulic properties, 1 to 15% by weight of alumina cement, 5 to 25% by weight of microsilica,
And a heat-insulating castable containing 1 to 5% by weight of a ceramic fiber.
たはムライト質の１種または２種以上である請求項１記
載の断熱キャスタブル。2. The heat-insulating castable according to claim 1, wherein the refractory aggregate is one or more of alumina and / or mullite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8204302A JPH1029874A (en) | 1996-07-15 | 1996-07-15 | Heat insulating castable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8204302A JPH1029874A (en) | 1996-07-15 | 1996-07-15 | Heat insulating castable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1029874A true JPH1029874A (en) | 1998-02-03 |
Family
ID=16488237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8204302A Pending JPH1029874A (en) | 1996-07-15 | 1996-07-15 | Heat insulating castable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1029874A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491123B1 (en) * | 2002-08-17 | 2005-05-25 | 주식회사 포스코 | High intensity castable refractories with good adiabatic and high thermal shock resistance |
| FR2898353A1 (en) * | 2006-03-07 | 2007-09-14 | Lafarge Aluminates Sa | BINDER FOR REFRACTORY CONCRETE, PREPARATION FOR REFRACTORY CONCRETE, REFRACTORY CONCRETE AND MANUFACTURING PROCESS |
-
1996
- 1996-07-15 JP JP8204302A patent/JPH1029874A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100491123B1 (en) * | 2002-08-17 | 2005-05-25 | 주식회사 포스코 | High intensity castable refractories with good adiabatic and high thermal shock resistance |
| FR2898353A1 (en) * | 2006-03-07 | 2007-09-14 | Lafarge Aluminates Sa | BINDER FOR REFRACTORY CONCRETE, PREPARATION FOR REFRACTORY CONCRETE, REFRACTORY CONCRETE AND MANUFACTURING PROCESS |
| WO2007101961A3 (en) * | 2006-03-07 | 2007-11-01 | Kerneos | Binder for refractory concrete, preparation for refractory concrete, refractory concrete and method for making same |
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