JPH0769743A - Thermally insulating castable - Google Patents
Thermally insulating castableInfo
- Publication number
- JPH0769743A JPH0769743A JP5246453A JP24645393A JPH0769743A JP H0769743 A JPH0769743 A JP H0769743A JP 5246453 A JP5246453 A JP 5246453A JP 24645393 A JP24645393 A JP 24645393A JP H0769743 A JPH0769743 A JP H0769743A
- Authority
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- Prior art keywords
- weight
- alumina
- castable
- strength
- heat
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、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、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、一般の断熱キャスタブルやセラミックファイバーで
は対応が困難な個所への適用を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 beam post of a heat treatment furnace for billet rolling, a lining material around a skid portion, a tundish cover used when casting molten steel, a lid for molten steel, a general heat-insulating castable or ceramic. The present invention relates to heat-insulating castables that can be applied to locations that are difficult to handle with fibers.
【０００２】[0002]
【従来の技術】一般に、断熱キャスタブルは、耐火性骨
材と軽量シャモット、パーライト等の軽量骨材に結合材
としてのアルミナセメントを混合した構成となってお
り、使用現場で水を加え、混練した後に対象構造物へ流
し込み、こて塗り、または吹きつけ施工することにより
耐火性能を付与する耐火物である。また、工業窯炉等の
ライニング材として知られているセラミックファイバー
は、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または金属製のアンカーピンで固定
して施工するようになっている。2. Description of the Related Art Generally, heat-insulating castables are made by mixing refractory aggregates and lightweight chamotte, pearlite, etc., with alumina cement as a binder. Water is added and kneaded at the site of use. It is a refractory material to which fire resistance is given by pouring it onto a target structure, troweling it, or spraying it later. Further, ceramic fibers known as a lining material for industrial kilns or the like are molded into a block shape or a felt shape, and are fixed by an adhesive binder or a ceramic or metal anchor pin for construction.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の断熱キャス
タブルは、強度特性を得るために多量のアルミナセメン
トが添加されている。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。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食性の低下を生ずるおそれがあっ
た。したがって、従来の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、あまり高温とならないもの
に用途が限定されていた。一方、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。また、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た。本発明はこのような従来
技術の課題を解決するためになされたもので、従来の断
熱キャスタブルの欠点である高温域での耐熱性の低下と
それに伴う耐食性の低下、並びにセラミックファイバー
の欠点である施工の困難性を改善したセラミックファイ
バー含有断熱キャスタブルの提供を目的とする。The above conventional heat-insulating castables are added with a large amount of alumina cement in order to obtain strength characteristics. Therefore, in the high temperature range, the alumina cement and the refractory aggregate react with each other to form a low melting point substance and deteriorate the structure. As a result, there is a possibility that the heat resistance is lowered in the high temperature range and the corrosion resistance is lowered due to the melting loss. Therefore, the conventional heat-insulating castables have been limited in use to those that do not become too hot, such as atmosphere furnaces and linings for flue ducts. On the other hand, ceramic fiber has characteristics of low heat conduction and low heat capacity, and is a suitable material for energy saving, but there is a problem that fixing work to a target structure is complicated and workability is poor. It was Further, there is a problem that the surrounding environment is deteriorated due to the scattering of the ceramic fibers. The present invention has been made to solve the problems of the prior art, and is a drawback of conventional heat-insulating castables, which is a decrease in heat resistance in a high temperature range and a corresponding decrease in corrosion resistance, and a defect of ceramic fibers. An object of the present invention is to provide a ceramic fiber-containing heat-insulating castable with improved construction difficulty.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、本発明者らが鋭意検討を重ねた結果、耐食性に優れ
るアルミナ質および／またはムライト質の耐火性骨材
と、発泡剤の使用による気泡の生成と、気泡の遊離防止
としてセラミックファイバーを活用することで、上記従
来の欠点を大幅に改良できることが明らかとなった。す
なわち、本発明の断熱キャスタブルは、アルミナ質およ
び／またはムライト質耐火性骨材、強度向上のための水
硬性アルミナ（ρ−Ａｌ2 Ｏ3 ）、軽量化および断熱性
向上のための気泡を生成する発泡剤、施工体中での気泡
の均一化を図るセラミックファイバー、およびマイクロ
シリカの各材料を混合して構成されている。In order to achieve the above object, the inventors of the present invention have conducted extensive studies, and as a result, have made use of an alumina-based and / or mullite-based refractory aggregate having excellent corrosion resistance and a foaming agent. It was revealed that the above-mentioned conventional defects can be remarkably improved by utilizing the ceramic fiber for the generation of bubbles due to the above and the prevention of the release of the bubbles. That is, the heat-insulating castables of the present invention generate alumina and / or mullite refractory aggregates, hydraulic alumina (ρ-Al 2 O 3 ) for improving strength, and bubbles for reducing weight and improving heat insulation. It is composed by mixing the foaming agent, the ceramic fiber for uniforming the air bubbles in the construction body, and the microsilica materials.
【０００５】アルミナおよびムライトの耐火性骨材は、
粒径１ｍｍ以下のものが使用され、その添加量は３５〜
４５重量％が好ましい。粒径１ｍｍ以上の原料を添加す
ると、粒子の施工体底部への沈降現象が認められ、均一
な組織が得られないばかりか、体積収縮や耐食性の低下
および熱伝導率特性にも著しく悪影響を及ぼす要因とな
りやすい。また、その添加量が３５重量％以下では、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
定性に欠ける結果となり易い。一方、添加量が４５重量
％を越えると嵩比重が大きくなり、断熱性が低下する。
なお耐火性骨材は、耐食性と容積安定性すなわち体積収
縮を減少させるために添加されるものであり、純度８０
〜９０％のアルミナとムライト質の原料を使用すること
が好ましい。The refractory aggregates of alumina and mullite are
Particles with a particle size of 1 mm or less are used, and the addition amount is 35-
45% by weight is preferred. When a raw material with a particle size of 1 mm or more is added, the particles settle to the bottom of the construction body, a uniform structure cannot be obtained, and volume shrinkage, corrosion resistance deterioration, and thermal conductivity characteristics are significantly adversely affected. It is easy to become a factor. Further, if the addition amount is 35% by weight or less, the volumetric shrinkage rate due to heat becomes large, and the volume stability of the construction body tends to be poor. On the other hand, if the addition amount exceeds 45% by weight, the bulk specific gravity becomes large and the heat insulating property deteriorates.
The refractory aggregate is added to reduce corrosion resistance and volume stability, that is, volume shrinkage, and has a purity of 80%.
It is preferred to use ˜90% alumina and mullite raw materials.
【０００６】また本発明では、強度発現のためにアルミ
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
アルミナを結合材として用いており、従来の断熱キャス
タブルのようなアルミナセメントは一切添加していな
い。アルミナセメントは、後述の発泡剤と組合わせた場
合に水和が完全に抑制されてしまい、脱型可能な状態に
まで一週間以上の期間が必要となり、また仮に脱型でき
てもセメント中のＣａＯがセラミックファイバーの融剤
となり、加熱により著しい体積収縮を伴うためである。
水硬性を有する遷移アルミナは、アルミナ水和物（バイ
ヤライト，ノルドストランダイト等；Al2O3・3H2O）を２
５０℃にて加熱脱水して得られるρ−Ａｌ2 Ｏ3 が使用
される。ρ−Ａｌ2 Ｏ3 は、水の添加によりバイヤライ
トと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。ここで、アルミナ水和物中に含
まれるＡｌ2 Ｏ3 の量は、例えば９９％程度と非常に多
く、またＮａ2 ＯやＦｅ2 Ｏ3 等の不純物が非常に少な
いためにセラミックファイバーへ与える影響も小さく、
硬化時間もアルミナセメントと同程度の時間にて硬化す
るという特性を有している。水硬性を有する遷移アルミ
ナの添加量は、４０〜６０重量％の範囲内が好ましい。
４０重量％以下では機械的強度特性が著しく劣化し、脱
型に必要な強度すら得られなくなってしまう。また、６
０重量％以上とすると、６００〜１０００℃での中間部
温度域での強度低下が著しくなり、後述の強度発現材を
多量に添加する必要が生じひいては耐熱性に影響を与え
る結果となるためである。Further, in the present invention, in order to develop the strength, transitional alumina having hydraulic properties generated at the dehydration transition of alumina hydrate is used as a binder, and any alumina cement such as conventional heat-insulating castable is added. I haven't. Alumina cement completely suppresses hydration when combined with a foaming agent described below, and it requires a period of at least one week before it can be demolded. This is because CaO serves as a fluxing agent for the ceramic fibers and causes a significant volume contraction upon heating.
The transition alumina having hydraulic properties is composed of alumina hydrate (bayerite, nordstrandite, etc .; Al 2 O 3 .3H 2 O) 2
Ρ-Al 2 O 3 obtained by heating and dehydrating at 50 ° C. is used. It is known that ρ-Al 2 O 3 forms bayerite and boehmite gel by adding water, and exhibits strength by gelling. Here, the amount of Al 2 O 3 contained in the alumina hydrate is very large, for example, about 99%, and since impurities such as Na 2 O and Fe 2 O 3 are very small, it is given to the ceramic fiber. Little impact,
It has the characteristic that it cures in the same time as the alumina cement. The addition amount of the hydraulic transition alumina is preferably in the range of 40 to 60% by weight.
If it is 40% by weight or less, the mechanical strength properties are significantly deteriorated, and even the strength required for demolding cannot be obtained. Also, 6
When it is 0% by weight or more, the strength decrease in the intermediate temperature range at 600 to 1000 ° C. becomes remarkable, and it becomes necessary to add a large amount of the strength-developing material described later, which in turn results in affecting heat resistance. is there.
【０００７】マイクロシリカは、Ｆｅ−Ｓｉ製造にとも
なう副産物として得られる。このマイクロシリカは、流
動性の向上と加熱による強度発現を目的として添加され
る。上述した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発現するが、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。そこで、マイクロ
シリカの低温度での焼結性に着目して、上記中間温度域
での強度低下を解消した。また、マイクロシリカは、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。しかし、マイクロシリカは副
産物として得られるものであるため不純物の含量が多
く、添加量には十分な検討が必要である。そこで本発明
者は、このマイクロシリカの添加量について検討を重ね
た結果、４〜１０重量％の範囲が最適であることを見い
だした。上記範囲を逸脱すると、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った。Microsilica is obtained as a by-product in the production of Fe-Si. This micro silica is added for the purpose of improving fluidity and developing strength by heating. The above-mentioned hydraulic transition alumina has a strength by forming a hydrated alumina and a gel by hydration, but causes a dehydration effect by heating, causing an extreme decrease in strength near the intermediate temperature range of 600 to 1000 ° C. Occurs. Therefore, paying attention to the sinterability of microsilica at low temperature, the strength reduction in the intermediate temperature range was eliminated. In addition, 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. However, since microsilica is obtained as a by-product, it contains a large amount of impurities, and it is necessary to thoroughly study the amount of addition. Therefore, the present inventor has conducted repeated studies on the addition amount of the microsilica and found that the range of 4 to 10% by weight is optimum. If the amount exceeds the above range, sufficient mechanical strength cannot be obtained even if microsilica is added, and the volume shrinkage tends to increase.
【０００８】発泡材としては、例えばラウリル硫酸ナト
リウムや市販の粉末洗剤が用いられる。すなわち、前述
の耐火性骨材粉末、水硬性を有する遷移アルミナ、およ
びマイクロシリカに上記発泡材を加えて混合し、施工に
際し所定量の水を添加するとともに混練して気泡を発生
させる。気泡は、水硬性を有する遷移アルミナのゲル化
作用により、施工体中に直径５０〜１００μｍ程度の単
独粒として分布し、断熱性を向上させる。ここで、発泡
剤の添加量は、０．０５〜０．５０重量％の範囲とし、
特に０．１〜０．２重量％程度が好ましい。添加量が
０．０５重量％より少ないと気泡の分布量が少なくな
り、十分な断熱性を付与できない。一方、添加量が０．
５０重量％を越えると機械的強度が低下してしまう。な
お、発泡剤の添加は、スラリーの流動性を向上させ、空
気連孔作用による著しい減水作用が生じる結果、機械的
強度が向上することも判明した。As the foam material, for example, sodium lauryl sulfate or a commercially available powder detergent is used. That is, the above foaming material is added to and mixed with the above-mentioned refractory aggregate powder, hydraulic transition alumina, and microsilica, and a predetermined amount of water is added and kneaded during the construction to generate bubbles. The bubbles are distributed as individual particles having a diameter of about 50 to 100 μm in the construction body by the gelling action of the transition alumina having hydraulic properties, and improve the heat insulating property. Here, the amount of the foaming agent added is in the range of 0.05 to 0.50% by weight,
Particularly, about 0.1 to 0.2% by weight is preferable. If the amount added is less than 0.05% by weight, the amount of air bubbles distributed will be too small to provide sufficient heat insulation. On the other hand, when the addition amount is 0.
If it exceeds 50% by weight, the mechanical strength will decrease. It was also found that the addition of the foaming agent improves the fluidity of the slurry and results in a remarkable water reducing action due to the action of the air communicating holes, resulting in an improvement in mechanical strength.
【０００９】セラミックファイバーは、上記気泡の遊離
を防止して、施工体中に気泡を均一に分布させるために
添加している。すなわち、ラウリル硫酸ナトリウムや洗
剤等の発泡剤によって混練時に生成した気泡を含むスラ
リーは、そのままの状態で施工しても気泡が施工表面に
浮遊してしまい、施工体中に均一に分布させることがで
きない。その結果、施工体は耐火性骨材を主とする下部
層と、気泡が多量に存在する上部層の二層構造を形成し
てしまい、目的とする軽量で強度特性に優れた断熱キャ
スタブルが得られない。そこで本発明では、セラミック
ファイバーをキャスタブル全体へ均一に分散させること
により気泡の浮遊を防止し、施工体全体へ均一に気泡が
分布するように構成した。セラミックファイバーの添加
量は、１〜４重量％の範囲が好ましい。セラミックファ
イバーの添加量が４重量％を越えると、キャスタブルの
流動性が著しく低下するとともに、強度特性も極端に低
下する。また、添加量が１重量％未満では気泡分布の均
一化を十分に図れない。ここで、添加するセラミックフ
ァイバーは、製品の耐熱要求により変わるが、一般にム
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い。なお、セラミックファイバーは
バルク状を呈しているため、耐火性骨材と均一に混合す
るには、攪拌能力に優れる強力なミキサーを使用しなけ
ればならない。Ceramic fibers are added to prevent the above-mentioned air bubbles from being released and to evenly distribute the air bubbles in the construction body. That is, a slurry containing bubbles generated at the time of kneading with a foaming agent such as sodium lauryl sulfate or a detergent causes the bubbles to float on the construction surface even when the construction is performed as it is, and can be evenly distributed in the construction body. Can not. As a result, the construction body forms a two-layer structure consisting of a lower layer mainly consisting of refractory aggregates and an upper layer in which a large amount of air bubbles are present, resulting in the desired lightweight, heat-insulating castable with excellent strength characteristics. I can't. Therefore, in the present invention, the ceramic fibers are uniformly dispersed in the entire castable structure to prevent the bubbles from floating and to distribute the bubbles evenly throughout the construction body. The addition amount of the ceramic fiber is preferably in the range of 1 to 4% by weight. If the amount of the ceramic fiber added exceeds 4% by weight, the fluidity of the castable will be significantly lowered and the strength characteristics will be extremely lowered. Further, if the addition amount is less than 1% by weight, the uniform distribution of bubbles cannot be achieved sufficiently. Here, the ceramic fiber to be added varies depending on the heat resistance requirement of the product, but a ceramic fiber composed of a mullite component is generally used. The ceramic fiber may be either crystalline or amorphous. Since the ceramic fibers have a bulk shape, in order to uniformly mix them with the refractory aggregate, a powerful mixer having excellent stirring ability must be used.
【００１０】[0010]
【作用】上述した本発明の断熱キャスタブルは、アルミ
ナセメントに代え、水硬性アルミナとマイクロシリカを
添加することによって高温域での強度発現と施工性の向
上を図り、さらにセラミックファイバーの添加により気
泡分布の均一化を図って断熱性を向上させている。その
結果、高温域での耐熱性、耐食性、機械的強度の向上が
図られ、各種用途への使用が可能となった。しかも、施
工性に優れ断熱施工作業の容易化も図ることができる。The above-described heat-insulating castable caster according to the present invention, instead of alumina cement, contains hydraulic alumina and microsilica to improve strength and workability in a high temperature range. To improve the heat insulation. As a result, heat resistance, corrosion resistance, and mechanical strength in the high temperature range were improved, and it became possible to use it for various purposes. Moreover, the workability is excellent and the heat insulating work can be facilitated.
【００１１】[0011]
【実施例】以下、本発明を実施例に基づき詳細に説明す
る。但し、本発明は下記実施例により制限されるもので
はない。 実施例１ 結晶質セラミックファイバー４重量％、焼結ムライト
１．０〜２０重量％と焼結ムライト粉２１重量％、シリ
カ微粉５重量％、水硬性アルミナ５０重量％、および市
販の洗剤粉末０．２重量％を配合し、ミキサー（千代田
技研工業（株）製、オムニミキサー（商品名））により
５分間混合して断熱キャスタブルを得た。同断熱キャス
タブル１００重量％に水６０重量％を添加して攪拌し、
スラリーを得た。かかるスラリーは良好な流動性と硬化
特性を有し、１１０℃の温度で乾燥した後の強度特性
は、曲げ強度１０ｋｇｆ／ｃｍ2 、圧縮強度２５ｋｇｆ
／ｃｍ2 であった。EXAMPLES The present invention will now be described in detail based on examples. However, the present invention is not limited to the following examples. Example 1 4% by weight of crystalline ceramic fiber, 1.0 to 20% by weight of sintered mullite, 21% by weight of sintered mullite powder, 5% by weight of fine silica powder, 50% by weight of hydraulic alumina, and commercially available detergent powder of 0. 2 wt% was blended and mixed for 5 minutes with a mixer (Omni Mixer (trade name) manufactured by Chiyoda Giken Kogyo Co., Ltd.) to obtain a heat insulating castable. 60% by weight of water was added to 100% by weight of the heat-insulating castable and stirred,
A slurry was obtained. Such a slurry has good fluidity and hardening characteristics, and the strength characteristics after drying at a temperature of 110 ° C. are bending strength of 10 kgf / cm 2 and compression strength of 25 kgf.
Was / cm 2 .
【００１２】実施例２ 非晶質のセラミックファイバー４重量％、電融アルミナ
１．０〜２０重量％と電融アルミナ粉２０重量％、シリ
カ微粉６重量％、水硬性アルミナ５０重量％、ラウリル
硫酸ナトリウム０．２重量％を配合し、実施例１と同じ
条件で断熱キャスタブルを得た。同断熱キャスタブル１
００重量％に水６５重量％を添加して攪拌し、スラリー
を得た。かかるスラリーは良好な流動性と硬化特性を有
し、乾燥後の強度特性は、曲げ強度１２ｋｇｆ／ｃｍ
2 、圧縮強度３０ｋｇｆ／ｃｍ2 であった。Example 2 4% by weight of amorphous ceramic fiber, 1.0 to 20% by weight of fused alumina, 20% by weight of fused alumina powder, 6% by weight of fine silica powder, 50% by weight of hydraulic alumina, and lauryl sulfate. 0.2% by weight of sodium was blended, and an adiabatic castable was obtained under the same conditions as in Example 1. Insulation castable 1
65 wt% of water was added to 00 wt% and stirred to obtain a slurry. Such a slurry has good fluidity and hardening characteristics, and the strength characteristics after drying are bending strength of 12 kgf / cm.
2 , the compression strength was 30 kgf / cm 2 .
【００１３】実施例３ 結晶質セラミックファイバー３重量％、電融アルミナ
１．０〜２０重量％、焼結ムライト粉２０重量％、シリ
カ微粉７重量％、水硬性アルミナ５０重量％、ラウリル
硫酸ナトリウム０．２重量％を配合し、実施例１と同じ
条件で断熱キャスタブルを得た。同断熱キャスタブル１
００重量％に水５８重量％を添加して攪拌し、スラリー
を得た。かかるスラリーは良好な流動性と硬化特性を有
し、１１０℃の温度で乾燥後の嵩比重は０．８８、強度
特性は曲げ強度１２ｋｇｆ／ｃｍ2 、圧縮強度３０ｋｇ
ｆ／ｃｍ2 であった。Example 3 3% by weight of crystalline ceramic fiber, 1.0 to 20% by weight of fused alumina, 20% by weight of sintered mullite powder, 7% by weight of fine silica powder, 50% by weight of hydraulic alumina, and 0 sodium lauryl sulfate. 0.2 wt% was blended to obtain a heat-insulating castable under the same conditions as in Example 1. Insulation castable 1
58% by weight of water was added to 00% by weight and stirred to obtain a slurry. Such a slurry has good fluidity and hardening characteristics, has a bulk specific gravity of 0.88 after drying at a temperature of 110 ° C., strength characteristics of bending strength of 12 kgf / cm 2 , and compression strength of 30 kg.
It was f / cm 2 .
【００１４】実施例４ 非晶質セラミックファイバー２重量％、焼結ムライト
１．０〜２５重量％、焼結ムライト粉１４重量％、シリ
カ微粉４重量％、水硬性アルミナ５５重量％、ラウリル
硫酸ナトリウム０．２重量％を配合し、実施例１と同じ
条件で断熱キャスタブルを得た。同断熱キャスタブル１
００重量％に水６０重量％を添加して攪拌し、スラリー
を得た。かかるスラリーは良好な流動性と硬化特性を有
し、１１０℃の温度で乾燥後の成形体の嵩比重は０．８
６、強度特性は曲げ強度２０ｋｇｆ／ｃｍ2 、圧縮強度
４０ｋｇｆ／ｃｍ2 であった。Example 4 Amorphous ceramic fiber 2% by weight, sintered mullite 1.0 to 25% by weight, sintered mullite powder 14% by weight, fine silica powder 4% by weight, hydraulic alumina 55% by weight, sodium lauryl sulfate. 0.2% by weight was blended, and a heat insulating castable was obtained under the same conditions as in Example 1. Insulation castable 1
60% by weight of water was added to 00% by weight and stirred to obtain a slurry. Such a slurry has good fluidity and curing properties, and the bulk specific gravity of the molded body after drying at a temperature of 110 ° C. is 0.8.
6, strength properties Flexural strength 20 kgf / cm 2, was compression strength 40 kgf / cm 2.
【００１５】実施例５ 非晶質セラミックファイバー１重量％、焼結ムライト
１．０〜１５重量％、焼結ムライト粉２５重量％、シリ
カ微粉５重量％、水硬性アルミナ５４重量％、ラウリル
硫酸ナトリウム０．１重量％を配合し、実施例１と同じ
条件で断熱キャスタブルを得た。同断熱キャスタブル１
００重量％に水５８重量％を添加して攪拌し、スラリー
を得た。かかるスラリーは良好な流動性と硬化特性を有
し、１１０℃の温度で乾燥後の成形体の嵩比重は０．９
２、強度特性は、曲げ強度２５ｋｇｆ／ｃｍ2 、圧縮強
度４５ｋｇｆ／ｃｍ2 であった。Example 5 1% by weight of amorphous ceramic fiber, 1.0-15% by weight of sintered mullite, 25% by weight of sintered mullite powder, 5% by weight of fine silica powder, 54% by weight of hydraulic alumina, sodium lauryl sulfate. 0.1% by weight was blended, and a heat insulating castable was obtained under the same conditions as in Example 1. Insulation castable 1
58% by weight of water was added to 00% by weight and stirred to obtain a slurry. Such a slurry has good fluidity and curing characteristics, and the bulk specific gravity of the molded body after drying at a temperature of 110 ° C. is 0.9.
2, strength properties, flexural strength 25 kgf / cm 2, was compression strength 45 kgf / cm 2.
【００１６】実施例６ 非晶質セラミックファイバー３重量％、焼結ムライト
１．０〜２０重量％、焼結ムライト粉１４重量％、シリ
カ微粉３重量％、水硬性アルミナ６０重量％、市販の粉
末洗剤０．３重量％を配合し、実施例１と同じ条件で断
熱キャスタブルを得た。同断熱キャスタブル１００重量
％に水６２重量％を添加して攪拌し、スラリーを得た。
かかるスラリーは良好な流動性と硬化特性を有し、１１
０℃の温度で乾燥後の成形体の嵩比重は０．８３、強度
特性は、曲げ強度８ｋｇｆ／ｃｍ2 、圧縮強度１８ｋｇ
ｆ／ｃｍ2 であった。以上説明した実施例１〜６の結果
を表１に示す。Example 6 Amorphous ceramic fiber 3% by weight, sintered mullite 1.0 to 20% by weight, sintered mullite powder 14% by weight, fine silica powder 3% by weight, hydraulic alumina 60% by weight, commercially available powder 0.3% by weight of a detergent was blended, and a heat insulating castable was obtained under the same conditions as in Example 1. 62 wt% of water was added to 100 wt% of the heat insulating castable and stirred to obtain a slurry.
Such a slurry has good flowability and hardening properties,
The bulk specific gravity of the molded product after drying at a temperature of 0 ° C. is 0.83, and the strength characteristics are bending strength of 8 kgf / cm 2 and compression strength of 18 kg.
It was f / cm 2 . The results of Examples 1 to 6 described above are shown in Table 1.
【００１７】比較例１ 結晶質セラミックファイバー１０重量％、焼結ムライト
１．０〜２０重量％と焼結ムライト粉２０重量％、シリ
カ微粉５重量％、水硬性アルミナ４５重量％、および市
販の洗剤粉末０．２重量％を配合し、ミキサー（千代田
技研工業（株）製、オムニミキサー（商品名））により
混合して断熱キャスタブルを得た。同断熱キャスタブル
１００重量％に水７５重量％を添加して攪拌し、スラリ
ーを得た。かかるスラリーは実施例１にみられたような
流動性がなく、１１０℃の温度で乾燥した後の成形体の
強度特性は、曲げ強度３ｋｇｆ／ｃｍ2 、圧縮強度８ｋ
ｇｆ／ｃｍ2 と低く、満足できる特性を得ることはでき
なかった。Comparative Example 1 10% by weight of crystalline ceramic fiber, 1.0 to 20% by weight of sintered mullite, 20% by weight of sintered mullite powder, 5% by weight of silica fine powder, 45% by weight of hydraulic alumina, and a commercial detergent. 0.2% by weight of the powder was blended and mixed by a mixer (manufactured by Chiyoda Giken Kogyo Co., Ltd., Omnimixer (trade name)) to obtain a heat insulating castable. 75 wt% of water was added to 100 wt% of the adiabatic castable and stirred to obtain a slurry. This slurry did not have the fluidity as seen in Example 1, and the strength characteristics of the molded product after drying at a temperature of 110 ° C. were bending strength of 3 kgf / cm 2 and compressive strength of 8 k.
As low as gf / cm 2 , it was not possible to obtain satisfactory characteristics.
【００１８】比較例２ 結晶質セラミックファイバー４重量％、焼結ムライト
１．０〜２０．０重量％と焼結ムライト粉２１重量％、
シリカ微粉５重量％、水硬性アルミナ５０重量％を配合
し、ミキサー（千代田技研工業（株）製、オムニミキサ
ー（商品名））により混合して断熱キャスタブルを得
た。同断熱キャスタブルは流動性が悪く、充填可能なス
ラリーにするには８０重量％の水を添加しなければなら
なかった。Comparative Example 2 4% by weight of crystalline ceramic fiber, 1.0 to 20.0% by weight of sintered mullite and 21% by weight of sintered mullite powder,
5% by weight of silica fine powder and 50% by weight of hydraulic alumina were blended and mixed by a mixer (manufactured by Chiyoda Giken Kogyo Co., Ltd., Omnimixer (trade name)) to obtain heat-resistant castables. The adiabatic castable had poor fluidity, and 80% by weight of water had to be added in order to form a fillable slurry.
【００１９】比較例３ 非晶質のセラミックファイバー４重量％、電融アルミナ
１．０〜３０重量％、焼結ムライト粉２５重量％、シリ
カ微粉５重量％、水硬性アルミナ３６重量％、ラウリル
硫酸ナトリウム０．２重量％を配合し、ミキサー（千代
田技研工業（株）製、オムニミキサー（商品名））によ
り混合して断熱キャスタブルを得た。同断熱キャスタブ
ルは、水６０重量％の添加で良好な流動性を得られた
が、曲げ強度２ｋｇｆ／ｃｍ2 、圧縮強度８ｋｇｆ／ｃ
ｍ2 と満足できる強度特性は得られなかった。Comparative Example 3 4% by weight of amorphous ceramic fiber, 1.0 to 30% by weight of fused alumina, 25% by weight of sintered mullite powder, 5% by weight of silica fine powder, 36% by weight of hydraulic alumina, and lauryl sulfate. 0.2 wt% of sodium was blended and mixed with a mixer (Omni Mixer (trade name) manufactured by Chiyoda Giken Kogyo Co., Ltd.) to obtain a heat insulating castable. The heat-insulating castable obtained good fluidity by adding 60% by weight of water, but had bending strength of 2 kgf / cm 2 and compressive strength of 8 kgf / c.
m 2 and satisfactory strength characteristics were not obtained.
【００２０】比較例４ 結晶質セラミックファイバー３重量％、電融アルミナ
３．０〜２５重量％、焼結ムライト粉１０重量％、水硬
性アルミナ６２重量％、ラウリル硫酸ナトリウム０．２
重量％を配合し、ミキサー（千代田技研工業（株）製、
オムニミキサー（商品名））により混合して断熱キャス
タブルを得た。同断熱キャスタブルに６５重量％の水を
添加混練し、乾燥後に得られた成形体には、アルミナ原
料の沈降が見られ、それに伴う強度の低下が認められ
た。Comparative Example 4 Crystalline ceramic fiber 3% by weight, fused alumina 3.0 to 25% by weight, sintered mullite powder 10% by weight, hydraulic alumina 62% by weight, sodium lauryl sulfate 0.2.
Blended by weight% with a mixer (Chiyoda Giken Co., Ltd.,
An omni-mixer (trade name) was mixed to obtain a heat-insulating castable. 65% by weight of water was added to the heat-insulating castable and kneaded, and the molded product obtained after drying was found to have sedimentation of the alumina raw material, and a decrease in strength was observed.
【００２１】比較例５ 結晶質セラミックファイバー４重量％、焼結ムライト
１．０〜２０．０重量％と焼結ムライト粉２１重量％、
シリカ微粉５重量％、水硬性アルミナ５０重量％、およ
び市販の洗剤粉末１．０重量％を配合し、ミキサー（千
代田技研工業（株）製、オムニミキサー（商品名））に
より混合して断熱キャスタブルを得た。同断熱キャスタ
ブル１００重量％に水６２重量％を添加混練し、１１０
℃の温度で乾燥して成形体を得た。この成形体の脱型は
可能であったものの、強度特性はデータを得ることがで
きない程に著しく劣っていた。以上説明した比較例１〜
５の結果を表２に示す。Comparative Example 5 4% by weight of crystalline ceramic fiber, 1.0-20.0% by weight of sintered mullite and 21% by weight of sintered mullite powder,
5% by weight of silica fine powder, 50% by weight of hydraulic alumina, and 1.0% by weight of commercially available detergent powder are mixed and mixed by a mixer (Chiyoda Giken Kogyo Co., Ltd., Omnimixer (trade name)) to be heat-insulating castable. Got 62% by weight of water was added to 100% by weight of the heat-insulating castable and kneaded, and 110
A molded body was obtained by drying at a temperature of ° C. Although it was possible to remove the molded product from the mold, the strength properties were remarkably inferior so that data could not be obtained. Comparative Examples 1 to 1 described above
The results of No. 5 are shown in Table 2.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【発明の効果】以上説明したように、本発明の断熱キャ
スタブルによれば、高温域での耐熱性、耐食性、機械的
強度の向上が図られ、各種用途への使用が可能となっ
た。しかも、施工性に優れ断熱施工作業の容易化を実現
することができる。As described above, according to the heat-insulating castables of the present invention, the heat resistance, corrosion resistance and mechanical strength in a high temperature range can be improved, and they can be used for various purposes. Moreover, the workability is excellent and the heat insulating work can be facilitated.
Claims (2)
ライト質耐火性骨材と、水硬性を有する中間アルミナ
と、発泡材と、セラミックファイバーと、マイクロシリ
カとを含有してなる断熱キャスタブル。1. An adiabatic castable comprising an alumina refractory aggregate and / or a mullite refractory aggregate, an intermediate alumina having hydraulic properties, a foam material, a ceramic fiber, and microsilica.
材および／またはムライト質耐火性骨材と、４０〜６０
重量％の水硬性を有する遷移アルミナと、０．０５〜
０．５０重量％の発泡材と、１〜５重量％のセラミック
ファイバーと、３〜７重量％のマイクロシリカとを含有
してなる断熱キャスタブル。2. 35 to 45% by weight of alumina refractory aggregate and / or mullite refractory aggregate, 40-60
Transition alumina having a hydraulic property of wt%, 0.05-
An adiabatic castable containing 0.50% by weight of a foam material, 1 to 5% by weight of ceramic fibers and 3 to 7% by weight of micro silica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5246453A JP3024723B2 (en) | 1993-09-07 | 1993-09-07 | Insulated castable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5246453A JP3024723B2 (en) | 1993-09-07 | 1993-09-07 | Insulated castable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0769743A true JPH0769743A (en) | 1995-03-14 |
| JP3024723B2 JP3024723B2 (en) | 2000-03-21 |
Family
ID=17148663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5246453A Expired - Lifetime JP3024723B2 (en) | 1993-09-07 | 1993-09-07 | Insulated castable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3024723B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498772B1 (en) | 1999-09-20 | 2002-12-24 | Matsushita Electric Industrial Co., Ltd. | Optical disc apparatus |
| KR100491123B1 (en) * | 2002-08-17 | 2005-05-25 | 주식회사 포스코 | High intensity castable refractories with good adiabatic and high thermal shock resistance |
| KR100913156B1 (en) * | 2002-12-24 | 2009-08-19 | 주식회사 포스코 | A method of manufacturing castable block |
| CN109748597A (en) * | 2019-03-20 | 2019-05-14 | 苏州北美国际高级中学 | A kind of presoma method that mutually gelling prepares mullite porous ceramic |
-
1993
- 1993-09-07 JP JP5246453A patent/JP3024723B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498772B1 (en) | 1999-09-20 | 2002-12-24 | Matsushita Electric Industrial Co., Ltd. | Optical disc apparatus |
| KR100491123B1 (en) * | 2002-08-17 | 2005-05-25 | 주식회사 포스코 | High intensity castable refractories with good adiabatic and high thermal shock resistance |
| KR100913156B1 (en) * | 2002-12-24 | 2009-08-19 | 주식회사 포스코 | A method of manufacturing castable block |
| CN109748597A (en) * | 2019-03-20 | 2019-05-14 | 苏州北美国际高级中学 | A kind of presoma method that mutually gelling prepares mullite porous ceramic |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3024723B2 (en) | 2000-03-21 |
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Free format text: JAPANESE INTERMEDIATE CODE: R350 |