JPH039066B2

JPH039066B2 -

Info

Publication number: JPH039066B2
Application number: JP59269526A
Authority: JP
Inventors: Hiroshi Kano; Tsutomu Harada
Original assignee: Kurosaki Refractories Co Ltd
Current assignee: Krosaki Harima Corp
Priority date: 1984-12-19
Filing date: 1984-12-19
Publication date: 1991-02-07
Also published as: JPS61146773A

Description

[Detailed description of the invention]

〔産業上の利用分野〕本発明は溶融金属流量のコントロールに使用す
るスライデイングノズル（SN）装置のプレート
れんがに関する。〔従来の技術〕 SN装置は、大きく分けて上部ノズル、固定及
び摺動プレートからなるプレートれんが、下部ノ
ズルの三つの部分から構成されており、この中で
も特にプレートれんがは、溶融金属流のコントロ
ールを司る最も高度な機能が要求される部分であ
る。そして、プレートれんがは、溶融金属流による
急激な熱衝撃と摩耗の物理的かつ化学的な侵食作
用を受けるので、耐スポーリング性と耐食性が具
備すべき最も重要な性質である。本発明者は、先に特開昭56−140064号公報にお
いて、耐火性骨材に0.5mm以下の粒度の低融点金
属粉を１〜20重量％含有せしめ、800℃以下の加
熱処理を施すことにより中間温度域（400〜700
℃）での強度劣化、耐スポーリング性及び耐食性
を改善したSNプレートを開示した。〔発明が解決しようとする問題点〕しかしながら、例えばAl、Al合金のような低
融点金属の粉末の添加は、フレーク、アトマイズ
粉末のいずれも機械的強度と耐食性の向上には効
果があつても、亀裂の発達を防止する効果はそれ
ほど大きくないという解決すべき問題がある。本発明の目的は、高い機械的強度と耐食性を有
すると共に、耐スポーリング性が著しく改善され
たSNプレートを提供することにある。〔問題点を解決するための手段〕前記本発明の目的は、耐火骨材と有機質バイン
ダとの配合物に、融点が1000℃以下の低融点の特
定の大きさを有する金属フアイバを添加すること
によつて達成される。本発明に適用できる耐火性骨材としては、シリ
カ、アルミナ、シリカ−アルミナ、マグネシア、
スピネル、クロム鉱、SiC、Si₃N₄、B₄C、BN、
黒鉛及び無定形炭素等の炭素質材料の中の任意の
ものを用いることができる。有機質バインダとしては、残留炭素量が多いも
のが好ましく、さらにコストの点でフエノール、
フラン系の樹脂が好ましいが、特にこれらに限定
されるものではない。低融点金属フアイバとしては、融点が1000℃以
下のAl、Mg、Zn、Sn、Ba、Pb等の金属及びそ
れらの合金等の任意のものが使用できるが、それ
よりも高融点の金属、合金の場合には、中間温度
域（400〜700℃）での強度補強効果が期待できな
い。上記低融点金属フアイバは、直線、曲線、山
形、波形等の種々の形状で使用でき、該金属フア
イバは直径0.01mm以上0.1mm未満の範囲が適して
おり、0.01mm未満の太さでは、配合物中への分散
が困難であり、0.1mm以上では耐スポーリング性
の向上が期待できない。なお、上記金属フアイバ
は均一な太さである必要はなく、種々のものを混
合して用いてもよい。上記金属フアイバの長さは１mm以上５mm未満が
適当であり、この範囲外であると充填性が不良と
なり強度不足となる。金属フアイバの添加量は、前記耐火性骨材に対
し、0.5〜９重量％が適している。0.5重量％未満
では充分な強度と耐スポーリング性が得られな
い。逆に９重量％を超えるとマトリツクス中の金
属フアイバの比率が大きくなりすぎ、耐火物とし
ての性能の低下が生じ、また、耐スポーリング性
の向上も顕著でなくなり、さらに、混合、成形作
業が困難となり、良好な品質が得られない。前記配合物へこの低融点金属フアイバを添加し
た後、通常の条件で成形したのち、800℃以下で
加熱処理する。加熱温度が800℃を越えると、添加した金属フ
アイバの大部分が溶融してしまい、金属フアイバ
が有する耐食性、機械的強度それに耐スポーリン
グ性向上の機能が失われてしまう。その加熱温度
は、とくに600℃以下であるのが好ましい。また、前記低融点金属フアイバとともに、その
他のAl、Mg、Zn、Sn等の粒子直径0.5mm以下の
低融点金属粉を耐火性骨材に対して外掛で１〜15
重量％添加することによつて、400〜700℃の中間
温度域におけるレジンの分解等による強度低下を
完全に防止することができる。この低融点金属粉の添加については、特開昭55
−65348号公報に開示されているが、前記金属フ
アイバの添加と併用に当たつては、同公報に記載
の要領をそのまま利用することができる。〔実施例〕次に本発明を実施例により具体的に説明する
が、本発明はこれらの実施例に限定されるもので
はない。実施例１表１は、アルミナ系耐火物に径の異なるAlフ
アイバを添加したSN用プレートれんがの品質を
示す。同表から、本発明品（試料２〜６）は、
Alフアイバを添加していない比較品（試料１）
に比べて、耐スポーリング性が著しく優れている
ことが判る。また、試料４を65tタンデイツシユSN装置に適
用して実用試験をしたところ、従来の焼成れんが
に対して、同等以上の耐用性を示すとともに、亀
裂の発生が少なく、摺動面の安定性も良好であつ
た。実施例２実施例１とは異なる骨材に本発明を適用した
SN用プレートれんがの品質を表２に示す。本発明品（試料８〜10）は、Alフアイバを添
加していない比較品（試料７）に比べて、耐スポ
ーリング性が著しく優れていることが判る。本発明に係る試料８を60t取鍋用SN装置に適用
して実用試験に供したところ、従来の焼成れんが
と同等の耐用性が得られ、亀裂の発生が少なく、
摺動面の安定性も良好であつた。 [Industrial Field of Application] The present invention relates to a plate brick for a sliding nozzle (SN) device used to control the flow rate of molten metal. [Prior art] The SN device is roughly divided into three parts: an upper nozzle, a plate brick consisting of fixed and sliding plates, and a lower nozzle. Among these, the plate brick is especially used to control the flow of molten metal. This is the part that requires the most advanced functions. Since plate bricks are subject to physical and chemical erosion due to rapid thermal shock and abrasion caused by molten metal flow, spalling resistance and corrosion resistance are the most important properties to have. The present inventor previously disclosed in JP-A No. 56-140064 that fire-resistant aggregate contains 1 to 20% by weight of low-melting point metal powder with a particle size of 0.5 mm or less and is subjected to heat treatment at 800°C or less. Intermediate temperature range (400~700
We have disclosed an SN plate that has improved strength deterioration, spalling resistance, and corrosion resistance at temperatures (℃). [Problems to be solved by the invention] However, although the addition of low melting point metal powders such as Al and Al alloys is effective in improving the mechanical strength and corrosion resistance of both flakes and atomized powders, However, there is a problem to be solved that the effect of preventing crack development is not so great. An object of the present invention is to provide an SN plate that has high mechanical strength and corrosion resistance, and has significantly improved spalling resistance. [Means for Solving the Problems] The object of the present invention is to add metal fibers having a specific size and a low melting point of 1000°C or less to a mixture of refractory aggregate and organic binder. achieved by. Refractory aggregates that can be applied to the present invention include silica, alumina, silica-alumina, magnesia,
Spinel, chromite, SiC, Si ₃ N ₄ , B ₄ C, BN,
Any of the carbonaceous materials can be used, such as graphite and amorphous carbon. As the organic binder, one with a large amount of residual carbon is preferable, and from the viewpoint of cost, phenol,
Furan-based resins are preferred, but are not particularly limited to these. As the low melting point metal fiber, any metal such as Al, Mg, Zn, Sn, Ba, Pb and alloys thereof with a melting point of 1000°C or less can be used, but metals and alloys with a higher melting point can be used. In this case, no strength reinforcement effect can be expected in the intermediate temperature range (400 to 700°C). The above-mentioned low melting point metal fiber can be used in various shapes such as straight, curved, chevron-shaped, and wavy.The diameter of the metal fiber is suitably in the range of 0.01 mm or more and less than 0.1 mm. It is difficult to disperse into objects, and if the thickness exceeds 0.1 mm, no improvement in spalling resistance can be expected. Note that the metal fibers do not need to have a uniform thickness, and a mixture of various metal fibers may be used. The length of the metal fiber is suitably 1 mm or more and less than 5 mm; if it is outside this range, the filling properties will be poor and the strength will be insufficient. The amount of metal fiber added is suitably 0.5 to 9% by weight based on the refractory aggregate. If it is less than 0.5% by weight, sufficient strength and spalling resistance cannot be obtained. On the other hand, if it exceeds 9% by weight, the ratio of metal fibers in the matrix becomes too large, resulting in a decline in performance as a refractory, improvement in spalling resistance is not significant, and furthermore, mixing and forming operations become difficult. This makes it difficult to obtain good quality. After adding the low melting point metal fiber to the blend, it is molded under normal conditions and then heat treated at a temperature below 800°C. If the heating temperature exceeds 800°C, most of the added metal fiber will melt, and the metal fiber will lose its ability to improve corrosion resistance, mechanical strength, and spalling resistance. The heating temperature is particularly preferably 600°C or lower. In addition to the above-mentioned low melting point metal fibers, other low melting point metal powders such as Al, Mg, Zn, Sn, etc. with a particle diameter of 0.5 mm or less are added to the refractory aggregate in an outer ratio of 1 to 15 mm.
By adding % by weight, it is possible to completely prevent a decrease in strength due to decomposition of the resin in the intermediate temperature range of 400 to 700°C. Regarding the addition of this low melting point metal powder,
Although it is disclosed in Japanese Patent No. 65348, the procedure described in the same publication can be used as is when adding the metal fibers. [Examples] Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples. Example 1 Table 1 shows the quality of plate bricks for SN made by adding Al fibers of different diameters to alumina-based refractories. From the same table, the products of the present invention (samples 2 to 6) are:
Comparative product without Al fiber added (Sample 1)
It can be seen that the spalling resistance is significantly better than that of . In addition, when sample 4 was applied to a 65t tundish SN equipment for a practical test, it was found to have durability equal to or higher than that of conventional fired bricks, with less cracking and good sliding surface stability. It was hot. Example 2 The present invention was applied to a different aggregate from Example 1.
Table 2 shows the quality of plate bricks for SN. It can be seen that the products of the present invention (Samples 8 to 10) have significantly better spalling resistance than the comparative product (Sample 7) to which no Al fibers are added. When sample 8 according to the present invention was applied to a 60t ladle SN device and subjected to practical tests, it was found to have the same durability as conventional fired bricks, with less cracking.
The stability of the sliding surface was also good.

【表】【table】

〔Effect of the invention〕

本発明にかかるSNプレートれんがは、摺動プ
レートに適用しても何等摺動性、耐食性に悪影響
を与えることがなく、しかも機械的性質とともに
耐スポーリング性を大幅に向上でき、耐用性を伸
ばすことができる。 Even when the SN plate brick according to the present invention is applied to a sliding plate, it does not have any adverse effect on sliding properties or corrosion resistance, and it can also significantly improve mechanical properties and spalling resistance, extending durability. be able to.

Claims

[Claims] 1. A compound consisting of a refractory aggregate and an organic binder has a diameter of 0.01 mm or more and a diameter of 0.1 mm to the refractory aggregate.
Adding 0.5 to 9% by weight of low melting point metal fiber with a length of 1 mm or more and less than 5 mm and a melting point of 1000°C or less,
Highly durable sliding nozzle plate bricks that have been heat treated at temperatures below 800℃. 2. A compound consisting of refractory aggregate and an organic binder has a diameter of 0.01 mm or more and 0.1 mm or more for the refractory aggregate.
Addition of 0.5 to 9% by weight of low melting point metal fiber with a particle size of less than 0.5 mm and a melting point of 1000℃ or less, with a length of 1 mm or more and less than 5 mm, and 1 to 15 weight% of low melting point metal powder with a particle size of 0.5 mm or less and a melting point of 1000℃ or less. Highly durable sliding nozzle plate bricks that are heat-treated at temperatures below 800℃.