JP2641523B2 - High alumina castable refractories - Google Patents
High alumina castable refractoriesInfo
- Publication number
- JP2641523B2 JP2641523B2 JP63218943A JP21894388A JP2641523B2 JP 2641523 B2 JP2641523 B2 JP 2641523B2 JP 63218943 A JP63218943 A JP 63218943A JP 21894388 A JP21894388 A JP 21894388A JP 2641523 B2 JP2641523 B2 JP 2641523B2
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- amount
- present
- high alumina
- alumina castable
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は不定形耐火物に関し、特に各種溶融金属容
器の内張材および高炉出銑用樋材に用いられるハイアル
ミナ質キャスタブル耐火物に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous refractory, and more particularly to a high alumina castable refractory used for a lining material of various molten metal containers and a blast furnace tapping material.
現在、各種溶融金属容器は出銑量の増加および脱ガス
比率の増加に伴ない、該容器の内張材および高炉出銑用
樋材に使用される耐火物には高耐食性、高耐スポーリン
グ性が要求されている。At present, various types of molten metal containers have high corrosion resistance and high spalling resistance for refractories used for lining materials and blast furnace tapping gutters as the amount of tapping and the degassing rate increase. Is required.
不定形耐火物の主流を占めるアルミナ系キャスタブル
において、これらに対応するためにアルミナの高純度
化、またはアルミナとマグネシアの併用が行われてい
る。Alumina castables, which occupy the mainstream of amorphous refractories, have been made to purify alumina or to use alumina and magnesia together in order to cope with these problems.
尚、特公昭49−20365号、特開昭53−120714公報には
本願が採用しているβ−アルミナを使用する不定形耐火
物が開示されているが、β−アルミナの使用量が多く耐
食性の面で難点がある。In addition, Japanese Patent Publication No. 49-20365 and Japanese Patent Application Laid-Open No. 53-120714 disclose an amorphous refractory using β-alumina adopted in the present application, but the amount of β-alumina used is large and the corrosion resistance is high. There are difficulties in terms of.
アルミナ系キャスタブルにおいて、高耐食性を得るた
めには、一般的にアルミナ純度を上げ、純アルミナに近
い組成にすることが望ましい。しかし、純アルミナ質キ
ャスタブルは熱衝撃に弱いために繰返し加熱を受ける脱
ガス浸漬管等に使用した場合、使用中に構造物の一部が
剥落するという難点がある。また、熱履歴を受けた後の
残存膨張性がないために、使用中に亀裂が発生し、溶
銑、溶鋼の侵入を受けやすい。In order to obtain high corrosion resistance in an alumina-based castable, it is generally desirable to increase the alumina purity and make the composition close to pure alumina. However, since pure alumina castables are weak against thermal shock, when used in a degassing immersion tube or the like which is repeatedly heated, there is a drawback that a part of the structure is peeled off during use. Further, since there is no residual expandability after receiving the heat history, a crack is generated during use, and the molten iron and the molten steel are easily invaded.
ハイアルミナ質キャスタブルにおいては、前記の問題
を解決するために、上記したようにマグネシアを添加
し、スピネル生成反応の際に発生するマイクロラックに
より応力の緩和を図り、耐スポーリング性を付与する方
法が最も一般的で有効である。しかし、マグネシアの添
加はアルミナ純度の低下を意味し、実質的には耐食性の
低下を招く。In high alumina castables, in order to solve the above-mentioned problem, a method of adding magnesia as described above, relaxing stress by a micro rack generated at the time of spinel generation reaction, and imparting spalling resistance Is the most common and effective. However, the addition of magnesia means a decrease in the purity of alumina, which substantially reduces the corrosion resistance.
この発明は上記従来の事情に鑑みて提案されたもので
あって、熱衝撃に強くかつ亀裂が生じ難いハイアルミナ
質キャスタブル耐火物を提供することを目的とする。The present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a high-alumina castable refractory which is resistant to thermal shock and hardly causes cracks.
本発明は上記目的を達成するために、ハイアルミナ耐
火物中にβ−アルミナを５〜70重量％含有せしめるよう
にした。β−アルミナを使用することにより、耐食性の
低下を招くことなく、高耐スポーリング性をするキャス
タブルを得た。According to the present invention, in order to achieve the above object, 5-alumina is contained in the high alumina refractory in an amount of 5 to 70% by weight. By using β-alumina, a castable having high spalling resistance was obtained without lowering the corrosion resistance.
β−アルミナ中には、その構成物として５重量％程度
のNa2Oが含有されている。このNa2Oは比較的β−アルミ
ナ中を移動し易いために、熱を受けた際、容易に周囲の
α−アルミナへと溶出していく。α−アルミナはこのNa
2Oと反応し、β−アルミナとなり、体積膨張を起こし周
囲にマイクロクラックを発生し、熱応力を緩和すること
となる。またNa2Oが溶出したβ−アルミナは形がい化す
るために、弾性低下を起こし亀裂の進展を抑制すること
となる。β-alumina contains about 5% by weight of Na 2 O as a constituent thereof. This Na 2 O relatively easily moves in β-alumina, and thus easily elutes into the surrounding α-alumina when heated. α-alumina is this Na
Reacts with 2 O to form β-alumina, which causes volume expansion, generates microcracks around it, and reduces thermal stress. Further, β-alumina from which Na 2 O has been eluted is deformed, so that its elasticity is reduced and the growth of cracks is suppressed.
本発明において、β−アルミナの使用量が５重量％未
満ではNa2Oの溶出による上記の効果がほとんど出ないた
め好ましくない。また、β−アルミナの使用量が70重量
％を越えるとNa2O量が必要以上に増加して耐食性低下が
著しくなり、また、β−アルミナ化による応力緩和効果
が減少するため好ましくない。In the present invention, if the amount of β-alumina is less than 5% by weight, the above-mentioned effects due to the elution of Na 2 O are hardly obtained, which is not preferable. On the other hand, if the amount of β-alumina exceeds 70% by weight, the amount of Na 2 O increases more than necessary, and the corrosion resistance is significantly reduced, and the stress relaxation effect due to β-alumina is undesirably reduced.
本発明では、上記β−アルミナ原料としてA12O3を92
〜95重量％、Na2Oを４〜７重量％含有するものを使用で
きる。β−アルミナの粒度は5mm程度以下、好ましくは3
mm程度以下である。In the present invention, the A1 2 O 3 as the β- alumina raw material 92
95 wt%, may be used those containing Na 2 O 4 to 7 wt%. The particle size of β-alumina is about 5 mm or less, preferably 3 mm or less.
mm or less.
β−アルミナ以外の耐火原料としては電融アルミナ、
焼結アルミナ等の高アルミナ質のものを使用する。ま
た、結合剤としては、各種アルミナセメント、水硬性ア
ルミナが好ましい。As a refractory raw material other than β-alumina, fused alumina,
Use a high alumina material such as sintered alumina. As the binder, various types of alumina cement and hydraulic alumina are preferable.
本発明のキャスタブル耐火物はアルミナ含有量が90重
量％以上とする必要があり、アルミナ含有量が90重量％
より少ないと耐食性が低下するので好ましくない。The castable refractory of the present invention must have an alumina content of 90% by weight or more, and an alumina content of 90% by weight.
If the amount is smaller, the corrosion resistance is undesirably reduced.
本発明では必要に応じて分散剤を使用することができ
る。In the present invention, a dispersant can be used as needed.
本発明の実施例をβ−アルミナを使用しな
い従来品、及び、β−アルミナ使用量が本発明の範囲外
である比較例とともに第１表に示す。β−アルミナ
の使用量が増加するにつれて、残存線変化率がプラスに
なっていき、弾性率が低下していくことが判る。これら
の物性値からも判るように、β−アルミナの使用量が５
重量％未満ではその効果はほとんど見られない。Examples of the present invention are shown in Table 1 together with a conventional product using no β-alumina and a comparative example in which the amount of β-alumina is out of the range of the present invention. It can be seen that as the amount of β-alumina increases, the residual linear change rate becomes positive and the elastic modulus decreases. As can be seen from these physical properties, the amount of β-alumina
If the amount is less than% by weight, the effect is hardly observed.
β−アルミナ添加による耐スポーリング性の確認を行
うため、高周波炉において溶鋼浸漬試験を行った。用い
た試料は従来品、実施例、実施例のキャスタブル耐
火物を100mmφ×200mmの円筒に鋳込み、これを脱枠、乾
燥後（110℃×24h）1600℃の溶鋼に15分間浸漬、15分間
の空冷を４回繰り返して行った。その結果、従来品にお
いては、４回浸漬後に一部剥落が見られたが、実施例
，においては剥落は見られず、試験後の試料を切断
し、亀裂の発生状況を観察したところ、実施例，，
従来品の順に小さい結果となった（1mm幅以上の亀裂の
長さを合計した値で評価した）。In order to confirm the spalling resistance due to the addition of β-alumina, a molten steel immersion test was performed in a high frequency furnace. The sample used was a conventional product, the castable refractory of the example and the example was cast into a cylinder of 100 mmφ × 200 mm, which was unframed, dried (110 ° C. × 24 h), dipped in molten steel at 1600 ° C. for 15 minutes, Air cooling was repeated four times. As a result, in the conventional product, some peeling was observed after immersion four times, but in the working examples, no peeling was observed, and the sample after the test was cut and the state of occurrence of cracks was observed. For example,
The results were smaller in the order of conventional products (evaluated by the sum of the lengths of cracks with a width of 1 mm or more).
〔発明の効果〕 以上説明したようにこの発明はハイアルミナ質原料に
β−アルミナを添加しているので、該β−アルミナ中の
Na2Oが作用し、熱応力を緩和して剥落を少なくし、また
弾性低下を引き起こして亀裂の進展を抑制する。 [Effects of the Invention] As described above, in the present invention, β-alumina is added to the high-alumina material, so that the β-alumina
Na 2 O acts to relieve thermal stress and reduce spalling, and also to reduce elasticity to suppress crack growth.
Claims (1)
を特徴としたハイアルミナ質キャスタブル耐火物。1. A high-alumina castable refractory comprising 5-70% by weight of β-alumina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63218943A JP2641523B2 (en) | 1988-08-31 | 1988-08-31 | High alumina castable refractories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63218943A JP2641523B2 (en) | 1988-08-31 | 1988-08-31 | High alumina castable refractories |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0269363A JPH0269363A (en) | 1990-03-08 |
| JP2641523B2 true JP2641523B2 (en) | 1997-08-13 |
Family
ID=16727761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63218943A Expired - Lifetime JP2641523B2 (en) | 1988-08-31 | 1988-08-31 | High alumina castable refractories |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2641523B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5657776B2 (en) | 2011-03-11 | 2015-01-21 | サン−ゴバン セラミックス アンド プラスティクス，インコーポレイティド | Refractory, glass overflow molding block, and method for producing glass body |
| KR20140018935A (en) | 2011-03-30 | 2014-02-13 | 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 | Refractory object, glass overflow forming block, and process of forming and using the refractory object |
| RU2013148633A (en) * | 2011-04-13 | 2015-05-20 | Сэнт-Гобэн Керамикс Энд Пластикс, Инк. | FIRE-RESISTANT PRODUCT AND METHOD FOR ITS FORMING (OPTIONS) |
| TWI597254B (en) | 2012-01-11 | 2017-09-01 | 聖高拜陶器塑膠公司 | Refractory object |
| CN102633513B (en) * | 2012-05-08 | 2013-09-18 | 中国钢研科技集团有限公司 | Fast-baking explosion proof type refractory castable for blast furnace iron runner |
| CN104261848A (en) * | 2014-09-23 | 2015-01-07 | 郑州瑞泰耐火科技有限公司 | Chrome-oxide-containing mullite brick and preparation method thereof |
| EP3262011A4 (en) | 2015-02-24 | 2018-08-01 | Saint-Gobain Ceramics&Plastics, Inc. | Refractory article and method of making |
| CN104961489B (en) * | 2015-07-23 | 2017-05-24 | 郑州市科源耐火材料有限公司 | Environment-friendly energy-saving semi-light-weight refractory castable for iron ladles |
-
1988
- 1988-08-31 JP JP63218943A patent/JP2641523B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0269363A (en) | 1990-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2641523B2 (en) | High alumina castable refractories | |
| US5565390A (en) | Use of a refractory ceramic brick for lining cement rotary kilns | |
| JP2000219575A (en) | Castable refractory | |
| JPH05330904A (en) | Highly spalling-resistant magnesia carbon brick | |
| US5215947A (en) | Refractory parts for devices for regulation or interruption of a jet of steel, made of refractory material | |
| JP2769400B2 (en) | Irregular refractories for hot metal parts | |
| JPH0323275A (en) | Monolithic refractory for casting | |
| JPH06144939A (en) | Basic castable refractory | |
| Nourbakhsh | INCREASING DURABILITY OF LADLE LINING REFRACTORIES BY UTILISING Al 2 O 3-MgO-C BRICKS | |
| KR100240983B1 (en) | Mortar composition of magnesia refractory | |
| KR930011274B1 (en) | Unshaped refractories of alumina-spinel | |
| JP3176836B2 (en) | Irregular refractories | |
| JP2548085B2 (en) | Irregular refractory composition | |
| JPH042655A (en) | Burned high-alumina refractory brick | |
| JPH04104965A (en) | Amorphous refractory | |
| SU779336A1 (en) | Refractory packing composition | |
| JPH0692272B2 (en) | Carbon-containing ladle lining Irregular refractory | |
| JP2023093810A (en) | Molten iron pretreatment container | |
| JP2024011190A (en) | Refractory brick and molten-metal container using the same | |
| GB2287461A (en) | Refractory brick | |
| JPH06116049A (en) | Spinel monolithic refractory | |
| JPH02141480A (en) | Castable refractory | |
| KR960011346B1 (en) | Process for the preparation of maginesia-carbon of refractories | |
| JPH07308759A (en) | Plate brick for sliding gate | |
| JP3787688B2 (en) | Method for densifying chromia-magnesia brick |