JPH09239503A - Nozzle refractories for continuous casting - Google Patents
Nozzle refractories for continuous castingInfo
- Publication number
- JPH09239503A JPH09239503A JP8068969A JP6896996A JPH09239503A JP H09239503 A JPH09239503 A JP H09239503A JP 8068969 A JP8068969 A JP 8068969A JP 6896996 A JP6896996 A JP 6896996A JP H09239503 A JPH09239503 A JP H09239503A
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- binder
- raw material
- continuous casting
- particle size
- 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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Links
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- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、連続鋳造用ノズ
ル耐火物に関するものである。TECHNICAL FIELD The present invention relates to a nozzle refractory for continuous casting.
【０００２】[0002]
【従来の技術】従来の連続鋳造用ノズル耐火物は、アル
ミナ黒鉛材質を主材質とし、パウダーライン部や嵌合部
等をジルコニア黒鉛材質、マグネシア黒鉛材質で補強し
た複合体として形成されている。2. Description of the Related Art A conventional refractory material for continuous casting nozzles is formed as a composite material whose main material is alumina graphite material and whose powder line portion and fitting portion are reinforced by zirconia graphite material and magnesia graphite material.
【０００３】これらの炭素含有耐火物は、一般に、天然
鱗状黒鉛を炭素源としている。しかし、鱗状黒鉛は３０
００℃以下では焼結しないため、鱗状黒鉛粒同士や鱗状
黒鉛粒と他の骨材粒との焼結による強度向上は期待でき
ない。それゆえ、耐火物の強度は、バインダーに由来し
て、カーボンボンドがどの程度形成されるかに依存して
いる。These carbon-containing refractories generally use natural scaly graphite as a carbon source. However, the flake graphite is 30
Since it does not sinter below 00 ° C., it cannot be expected to improve the strength due to the sintering of scaly graphite particles or the sintering of scaly graphite particles and other aggregate particles. Therefore, the strength of the refractory material depends on how much carbon bonds are formed due to the binder.
【０００４】炭素含有耐火物のバインダーとしては、一
般に、炭素収率４０％以上の液状フェノールレジンや粉
末レジン、炭素収率５０％以上のピッチバインダー等が
用いられている。As the binder containing carbon-containing refractory, liquid phenol resin or powder resin having a carbon yield of 40% or more, pitch binder having a carbon yield of 50% or more are generally used.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、液状の
バインダーや粉末バインダーとアルミナ、ジルコニア又
はマグネシア等の骨材粒や炭化珪素、シリカ、黒鉛粉末
等の微粉を混練工程において、骨材粒又は微粉の粒表面
が液状バインダーや粉末バインダーによって均一に濡れ
るように制御することは非常に難しい。However, in the step of kneading the liquid binder or powder binder and the aggregate particles such as alumina, zirconia or magnesia or the fine powder such as silicon carbide, silica, graphite powder, etc. It is very difficult to control the surface of the particles so that they are uniformly wet with the liquid binder or the powder binder.
【０００６】濡れ状態が不均一の場合には、強度低下や
バインダーの偏った部分で異常溶損が生じてしまう。When the wet state is not uniform, the strength is lowered and abnormal melting damage occurs in the uneven portion of the binder.
【０００７】また、マグネシア等の消化性を持つ材質で
は液状のバインダーに含まれる水分によって、マグネシ
ア骨材粒内に消化が起こり、体積膨脹等により材質強度
が著しく低下してしまう。Further, in the case of a digestible material such as magnesia, the moisture contained in the liquid binder causes digestion in the granules of the magnesia aggregate, and the material strength remarkably decreases due to volume expansion and the like.
【０００８】一方、特開平２−３１１３５８号公報に記
載の不焼成マグネシア・カーボンれんがは、マグネシウ
ム或いはマグネシウム−アルミニウム合金の取り扱いを
容易にするため、ピッチでコートしたマグネシウム・ア
ルミニウム合金粉末を０．５〜１０％含有させる構成に
なっている。On the other hand, in the unfired magnesia-carbon brick described in JP-A-2-311358, 0.5 mm of magnesium-aluminum alloy powder coated with pitch is used to facilitate handling of magnesium or magnesium-aluminum alloy. It is configured to contain 10%.
【０００９】また、特開平６−２９３５６５号公報は、
均質で緻密なＳｉ−ＳｉＣ材を得るため、メソフェーズ
含有ピッチを被覆したＳｉＣ粉末で成形体を形成し、こ
れを焼成した後Ｓｉを含浸するＳｉ−ＳｉＣ複合セラミ
ックスの製造方法を開示している。Further, Japanese Patent Laid-Open No. 6-293565 discloses that
In order to obtain a homogeneous and dense Si-SiC material, a method for producing a Si-SiC composite ceramic is disclosed, in which a compact is formed from SiC powder coated with mesophase-containing pitch, and the compact is fired and then impregnated with Si.
【００１０】しかしながら、特開平２−３１１３５８号
公報の不焼成マグネシア・カーボンれんがは、マグネシ
ウム或いはマグネシウム−アルミニウム合金の取り扱い
を容易にする目的で提案されたものであり、れんが自体
は、熱膨張率が高く、使用時に熱衝撃による割れなどの
不具合があり、連続鋳造用ノズルとして最適であるとは
言えない。However, the unfired magnesia-carbon brick disclosed in JP-A-2-311358 was proposed for the purpose of facilitating the handling of magnesium or a magnesium-aluminum alloy, and the brick itself has a coefficient of thermal expansion. It is expensive and has problems such as cracking due to thermal shock during use, so it cannot be said to be optimal as a nozzle for continuous casting.
【００１１】また、特開平６−２９３５６５号公報のＳ
ｉ−ＳｉＣ複合セラミックスも、熱膨張率が高いため、
熱衝撃による割れを生じる等の不具合があるため、連続
鋳造用ノズルとして最適であるとは言えない。Further, S in Japanese Patent Laid-Open No. 6-293565
Since i-SiC composite ceramics also has a high coefficient of thermal expansion,
Since it has defects such as cracking due to thermal shock, it cannot be said to be optimal as a continuous casting nozzle.
【００１２】このような従来技術の問題点に鑑み、本発
明は、見掛気孔率が小さく、十分な強度を有し、耐食性
も大きい連続鋳造用の各種ノズルに最適な連続鋳造用ノ
ズル耐火物を提供することを目的としている。In view of the above problems of the prior art, the present invention provides a continuous casting nozzle refractory which is suitable for various nozzles for continuous casting having a small apparent porosity, a sufficient strength and a large corrosion resistance. Is intended to provide.
【００１３】[0013]
【課題を解決するための手段】本願第１発明は、１００
〜３００℃で軟化するピッチを表面にコートした粒径７
４〜１０００μｍのアルミナ原料３０〜８０重量％を骨
材として用い、骨材粒子と同等以下の粒径の他の耐火物
原料として炭化珪素、シリカ、黒鉛粉末の少なくとも１
種を用い、結合材としてレジン系バインダーを用い、還
元性雰囲気で焼成してピッチをカーボンボンド化した構
成を有することを特徴とする連続鋳造用ノズル耐火物を
要旨としている。Means for Solving the Problems The first invention of the present application is 100
Particle size 7 with the surface coated with pitch that softens at ~ 300 ° C
At least one of silicon carbide, silica, and graphite powder is used as another refractory raw material having a particle size equal to or smaller than that of the aggregate particles, using 30 to 80% by weight of an alumina raw material of 4 to 1000 μm as an aggregate.
The gist is a nozzle refractory for continuous casting, which is characterized in that a pitch is formed into a carbon bond by firing in a reducing atmosphere using a seed-based resin binder as a binder.
【００１４】本願第２発明は、１００〜３００℃で軟化
するピッチを表面にコートした粒径７４〜１０００μｍ
のジルコニア原料４０〜９０重量％を骨材として用い、
骨材粒子と同等以下の粒径の他の耐火物原料としてシリ
カ、黒鉛粉末、カルシアの少なくとも１種を用い、結合
材としてレジン系バインダーを用い、還元性雰囲気で焼
成してピッチをカーボンボンド化した構成を有すること
を特徴とする連続鋳造用ノズル耐火物を要旨としてい
る。According to the second invention of the present application, the surface of which is coated with a pitch that softens at 100 to 300 ° C. has a particle diameter of 74 to 1000 μm.
Using 40 to 90% by weight of the zirconia raw material of as an aggregate,
At least one of silica, graphite powder, and calcia is used as another refractory raw material having a particle size equal to or smaller than that of the aggregate particles, and a resin binder is used as a binder, and the pitch is carbon-bonded by firing in a reducing atmosphere. A gist is a nozzle refractory for continuous casting, which is characterized by having the above configuration.
【００１５】本願第３発明は、１００〜３００℃で軟化
するピッチを表面にコートした粒径７４〜３０００μｍ
のマグネシア原料４０〜９０重量％を骨材として用い、
骨材粒子と同等以下の粒径の他の耐火物原料として炭化
珪素、シリカ、黒鉛粉末の少なくとも１種を用い、結合
材としてレジン系バインダーを用い、還元性雰囲気で焼
成してピッチをカーボンボンド化した構成を有すること
を特徴とする連続鋳造用ノズル耐火物を要旨としてい
る。In the third invention of the present application, a particle size of 74 to 3000 μm having a surface coated with a pitch that softens at 100 to 300 ° C.
40 to 90% by weight of the magnesia raw material of
At least one of silicon carbide, silica, and graphite powder is used as another refractory material having a particle size equal to or less than that of the aggregate particles, and a resin binder is used as the binder, and the pitch is carbon-bonded by firing in a reducing atmosphere. The gist is a nozzle refractory for continuous casting, which is characterized by having a simplified structure.
【００１６】[0016]
【発明の実施の形態】本発明の連続鋳造用ノズル耐火物
は、表面をバインダー成分のピッチによってコートした
アルミナ、ジルコニア又はマグネシアを骨材として用
い、骨材粒子と同等以下の粒径の他の耐火物原料として
炭化珪素、シリカ黒煙粉末、カルシアの少なくとも１種
を用い、結合剤としてレジン系バインダーを添加し、還
元性雰囲気で焼成してピッチをカーボンボンド化した構
成になっている。そして、骨材がアルミナの場合は１０
ＭＰａ以上、ジルコニアの場合は７ＭＰａ以上、マグネ
シアの場合は６ＭＰａ以上の曲げ強さを有することが好
ましい。より好ましい曲げ強さは、それぞれ１０ＭＰａ
以上、８ＭＰａ以上、７ＭＰａ以上である。ピッチは、
１００〜３００℃で軟化するものを用いる。BEST MODE FOR CARRYING OUT THE INVENTION A nozzle refractory for continuous casting according to the present invention uses alumina, zirconia or magnesia whose surface is coated with a pitch of a binder component as an aggregate and has a particle size equal to or smaller than that of the aggregate particles. At least one of silicon carbide, silica black smoke powder and calcia is used as a refractory material, a resin binder is added as a binder, and the pitch is carbon-bonded by firing in a reducing atmosphere. If the aggregate is alumina, 10
Bending strength of 7 MPa or more in the case of zirconia and 6 MPa or more in the case of magnesia is preferable. More preferable bending strength is 10 MPa, respectively
As described above, the pressure is 8 MPa or more and 7 MPa or more. The pitch is
What softens at 100-300 degreeC is used.
【００１７】バインダー成分のピッチによって骨材粒子
表面を均一に覆い、還元性雰囲気下で焼成してこれをカ
ーボンボンド化し、カーボンボンドを偏りなく分散する
ことにより、強度を向上することができるのである。カ
ーボンボンド化を確実に行うため、焼成温度は４００℃
以上とすることが好ましい。The strength of the aggregate particles can be improved by uniformly covering the surface of the aggregate particles with the pitch of the binder component, firing it in a reducing atmosphere to form carbon bonds, and dispersing the carbon bonds evenly. . The firing temperature is 400 ° C to ensure carbon bonding.
It is preferable to make the above.
【００１８】焼成によって軟化した骨材粒子周りのピッ
チが、マトリックスの微細な隙間を埋めるため、見掛気
孔率を低減でき耐食性も向上できる。Since the pitch around the aggregate particles softened by firing fills the minute gaps in the matrix, the apparent porosity can be reduced and the corrosion resistance can be improved.
【００１９】骨材のアルミナ、ジルコニア又はマグネシ
アの粒径は、７４μｍ以上とする。骨材粒径が７４μｍ
未満の場合には、ピッチの粘性によって骨材粒径よりも
ピッチのコーティング層の厚みの方が大きくなり、耐食
性が低下するという不具合が生じる。The grain size of alumina, zirconia or magnesia of the aggregate is 74 μm or more. Aggregate particle size is 74 μm
When it is less than the above range, the thickness of the coating layer of the pitch becomes larger than the particle diameter of the aggregate due to the viscosity of the pitch, which causes a problem that the corrosion resistance decreases.
【００２０】骨材のアルミナとジルコニアの粒径は１０
００μｍ以下、マグネシアの粒径は３０００μｍ以下と
する。これは、連続鋳造用耐火物として用いるアルミ
ナ、ジルコニア及びマグネシア原料の一般的な上限値で
あり、１０００μｍ又は３０００μｍを超えると強度が
極端に低下するという不具合が生じるからである。The particle size of alumina and zirconia of the aggregate is 10
The particle size of magnesia is set to 00 μm or less and 3000 μm or less. This is a general upper limit of the raw materials of alumina, zirconia and magnesia used as refractory for continuous casting, and when it exceeds 1000 μm or 3000 μm, the problem that strength is extremely lowered occurs.
【００２１】このような観点から、骨材として用いるア
ルミナとジルコニアのより好ましい粒径は７４〜１００
０μｍであり、マグネシアのより好ましい粒径は７４〜
３０００μｍである。From this point of view, the more preferable particle size of alumina and zirconia used as the aggregate is 74 to 100.
0 μm, and the more preferable particle size of magnesia is 74-
3000 μm.
【００２２】なお、粒径７４〜１０００（又は３００
０）μｍとは、最小粒子径が７４μｍで最大粒子径が１
０００（又は３０００）μｍの連続粒を意味している。The particle size is 74 to 1000 (or 300).
0) μm means a minimum particle size of 74 μm and a maximum particle size of 1
It means a continuous grain of 000 (or 3000) μm.
【００２３】骨材としてアルミナ原料を用いる場合に
は、その配合量は３０〜８０重量％とし、ジルコニア又
はマグネシア原料を用いる場合には、その配合量は４０
〜９０重量％とする。このように骨材の配合量を限定し
た理由は、連続鋳造用ノズル耐火物として現在使用され
ている配合量だからである。When an alumina raw material is used as the aggregate, its content is 30 to 80% by weight, and when a zirconia or magnesia raw material is used, the content is 40%.
Up to 90% by weight. The reason for limiting the compounding amount of the aggregate in this way is that the compounding amount is currently used as a nozzle refractory for continuous casting.
【００２４】ピッチとアルミナ、ジルコニア又はマグネ
シアの骨材は、１００〜２００℃で加熱しながら混練す
ることが好ましい。これによって、骨材粒子の表面を均
一にコーティングすることが可能となる。The pitch and the aggregate of alumina, zirconia or magnesia are preferably kneaded while heating at 100 to 200 ° C. This makes it possible to uniformly coat the surface of the aggregate particles.
【００２５】マグネシアは消化性を持っているが、ピッ
チで粒子表面を覆うことによって、バインダーに含まれ
る水分による消化を防止できる。Magnesia has digestibility, but by covering the particle surface with pitch, digestion due to water contained in the binder can be prevented.
【００２６】なお、本発明でいう骨材粒子と同等以下の
粒径の他の耐火物原料は、粒径を骨材粒子と同等以下と
することにより本発明のピッチコーティングの効果を十
分に得ることができるものである。The other refractory raw material having a particle size equal to or smaller than that of the aggregate particles according to the present invention has a particle size equal to or smaller than that of the aggregate particles, thereby sufficiently obtaining the effect of the pitch coating of the present invention. Is something that can be done.
【００２７】[0027]
【実施例】以下、本発明の実施例１〜５及び比較例１〜
５を説明する。EXAMPLES Examples 1 to 5 and Comparative Example 1 of the present invention will be described below.
5 will be described.
【００２８】実施例１〜２は、アルミナ黒鉛系の連続鋳
造ノズル耐火物の実施例である。Examples 1 and 2 are examples of refractory materials of continuous casting nozzle made of alumina graphite.
【００２９】表１に示す配合割合でアルミナ粒と、黒鉛
粉末と、シリカ粒と、炭化珪素を準備し、混練・成形・
焼成して耐火物を製造した。Alumina particles, graphite powder, silica particles, and silicon carbide were prepared at the compounding ratios shown in Table 1, and kneaded, molded, and molded.
Fired to produce a refractory.
【００３０】アルミナ粒の径は７４〜１０００μｍであ
った。アルミナ粒の表面には、硬ピッチとメソフェーズ
ピッチを約０．０５μｍの厚さでコーティングしておい
た。コーティングは、２００℃以下の熱間でピッチを液
体状態にして、骨材原料と混練することにより行った。
微粒原料として配合した黒鉛粉末、シリカ粒及び炭化珪
素の粒径はそれぞれ１００〜２００μｍ、８８〜２９７
μｍ、４４μｍ以下とした。The diameter of the alumina particles was 74 to 1000 μm. The surface of the alumina particles was coated with hard pitch and mesophase pitch with a thickness of about 0.05 μm. The coating was performed by bringing the pitch into a liquid state at a temperature of 200 ° C. or lower and kneading the aggregate raw material.
The particle size of graphite powder, silica particles, and silicon carbide compounded as fine particle raw materials are 100 to 200 μm and 88 to 297, respectively.
μm and 44 μm or less.
【００３１】一方、アルミナ粒にピッチをコーティング
せず、それ以外は同様の手順で比較例１〜２の耐火物を
製造した。On the other hand, refractory materials of Comparative Examples 1 and 2 were manufactured by the same procedure except that the alumina particles were not coated with pitch.
【００３２】実施例１〜２と比較例１〜２の耐火物の曲
げ強さ、動弾性率、見掛気孔率、かさ比重、耐食性指数
を測定した。その結果を表１に示す。なお、耐食性指数
は比較例１を１００としており、数値の大きいものほど
耐食性に優れている。The bending strength, kinetic elastic modulus, apparent porosity, bulk specific gravity and corrosion resistance index of the refractories of Examples 1 and 2 and Comparative Examples 1 and 2 were measured. Table 1 shows the results. The corrosion resistance index is set to 100 in Comparative Example 1, and the larger the value, the better the corrosion resistance.
【００３３】表１を見ると、実施例１及び２の方が比較
例１及び２よりも、曲げ強さが大きく、見掛気孔率が小
さく、耐食性が大きいことが分かる。From Table 1, it can be seen that Examples 1 and 2 have a higher bending strength, a smaller apparent porosity, and a higher corrosion resistance than Comparative Examples 1 and 2.
【００３４】実施例３〜４は、ジルコニア黒鉛系の連続
鋳造ノズル耐火物である。Examples 3 to 4 are zirconia graphite-based continuous casting nozzle refractories.
【００３５】骨材として粒径が７４〜１０００μｍのジ
ルコニア粒を用い、黒鉛粉末、シリカ粒、カルシアを添
加し、実施例１と同様にして耐火物を製造した。Zirconia particles having a particle size of 74 to 1000 μm were used as an aggregate, and graphite powder, silica particles, and calcia were added, and a refractory material was manufactured in the same manner as in Example 1.
【００３６】一方、ジルコニア粒にピッチをコートせ
ず、それ以外は同様にして比較例３〜４の耐火物を製造
した。On the other hand, the refractory materials of Comparative Examples 3 to 4 were manufactured in the same manner except that the zirconia grains were not coated with pitch.
【００３７】同様に、実施例３〜４と比較例３〜４の物
性を測定した。その結果を表２に示す。表２を見ると、
実施例３及び４の方が比較例３及び４よりも、曲げ強さ
が大きく、見掛気孔率が小さく、耐食性が大きいことが
分かる。Similarly, the physical properties of Examples 3 to 4 and Comparative Examples 3 to 4 were measured. Table 2 shows the results. Looking at Table 2,
It can be seen that Examples 3 and 4 have higher bending strength, smaller apparent porosity, and higher corrosion resistance than Comparative Examples 3 and 4.
【００３８】実施例５は、マグネシア黒鉛系の連続鋳造
ノズル耐火物である。Example 5 is a magnesia graphite-based continuous casting nozzle refractory material.
【００３９】骨材として粒径が７４〜３０００μｍのマ
グネシア粒を用い、黒鉛粉末、シリカ粒、炭化珪素を添
加し、実施例１と同様にして耐火物を製造した。A magnesia grain having a grain size of 74 to 3000 μm was used as an aggregate, and graphite powder, silica grain, and silicon carbide were added, and a refractory was manufactured in the same manner as in Example 1.
【００４０】一方、ジルコニア粒にピッチをコートせ
ず、それ以外は同様にして比較例５の耐火物を製造し
た。On the other hand, the refractory of Comparative Example 5 was manufactured in the same manner except that the zirconia grains were not coated with pitch.
【００４１】同様に、実施例５と比較例５の物性を測定
した。その結果を表３に示す。表３を見ると、実施例５
４の方が比較例５よりも、曲げ強さが大きく、見掛気孔
率が小さく、耐食性が大きいことが分かる。なお、比較
例５では、焼成後マグネシア粒に消化現象が認められ
た。Similarly, the physical properties of Example 5 and Comparative Example 5 were measured. Table 3 shows the results. Looking at Table 3, Example 5
It can be seen that No. 4 has a larger bending strength, a smaller apparent porosity, and a higher corrosion resistance than Comparative Example 5. In Comparative Example 5, the digestion phenomenon was found in the magnesia grains after firing.
【００４２】[0042]
【表１】 [Table 1]
【００４３】[0043]
【表２】 [Table 2]
【００４４】[0044]
【表３】 [Table 3]
【００４５】[0045]
【発明の効果】本発明の連続鋳造用ノズル耐火物は、見
掛気孔率が小さく、十分な強度を有しており、耐食性が
大きいので耐用寿命を大幅に向上できる。The nozzle refractory for continuous casting according to the present invention has a small apparent porosity, a sufficient strength, and a high corrosion resistance, so that the service life can be greatly improved.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 35/48 Ｃ０４Ｂ 35/48 Ａ (72)発明者 瀧川 整 愛知県刈谷市小垣江町南藤１番地 東芝セ ラミックス株式会社刈谷製造所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical indication location C04B 35/48 C04B 35/48 A (72) Inventor Sei Takigawa 1 Minamifuji, Ogakie-cho, Kariya city, Aichi prefecture Toshiba Ceramics Co., Ltd. Kariya Factory
Claims (3)
面にコートした粒径７４〜１０００μｍのアルミナ原料
３０〜８０重量％を骨材として用い、骨材粒子と同等以
下の粒径の他の耐火物原料として炭化珪素、シリカ、黒
鉛粉末の少なくとも１種を用い、結合材としてレジン系
バインダーを用い、還元性雰囲気で焼成してピッチをカ
ーボンボンド化した構成を有することを特徴とする連続
鋳造用ノズル耐火物。1. Another refractory having a particle size equal to or less than that of the aggregate particles is used by using 30 to 80% by weight of an alumina raw material having a particle size of 74 to 1000 μm and having a surface coated with a pitch softening at 100 to 300 ° C. At least one of silicon carbide, silica, and graphite powder is used as a material raw material, a resin binder is used as a binder, and the pitch is carbon-bonded by firing in a reducing atmosphere, for continuous casting. Nozzle refractory.
面にコートした粒径７４〜１０００μｍのジルコニア原
料４０〜９０重量％を骨材として用い、骨材粒子と同等
以下の粒径の他の耐火物原料としてシリカ、黒鉛粉末、
カルシアの少なくとも１種を用い、結合材としてレジン
系バインダーを用い、還元性雰囲気で焼成してピッチを
カーボンボンド化した構成を有することを特徴とする連
続鋳造用ノズル耐火物。2. A 40 to 90% by weight zirconia raw material having a particle size of 74 to 1000 .mu.m coated on the surface with a pitch softening at 100 to 300.degree. As raw material, silica, graphite powder,
A nozzle refractory for continuous casting, characterized in that at least one kind of calcia is used, a resin binder is used as a binder, and the pitch is carbon-bonded by firing in a reducing atmosphere.
面にコートした粒径７４〜３０００μｍのマグネシア原
料４０〜９０重量％を骨材として用い、骨材粒子と同等
以下の粒径の他の耐火物原料として炭化珪素、シリカ、
黒鉛粉末の少なくとも１種を用い、結合材としてレジン
系バインダーを用い、還元性雰囲気で焼成してピッチを
カーボンボンド化した構成を有することを特徴とする連
続鋳造用ノズル耐火物。3. A refractory having a particle size equal to or smaller than that of the aggregate particles is used by using 40 to 90% by weight of a magnesia raw material having a particle size of 74 to 3000 μm coated on the surface with a pitch softening at 100 to 300 ° C. As raw materials for silicon carbide, silica,
A nozzle refractory for continuous casting, characterized in that at least one kind of graphite powder is used, a resin binder is used as a binder, and the pitch is carbon-bonded by firing in a reducing atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06896996A JP3524668B2 (en) | 1996-03-01 | 1996-03-01 | Nozzle refractories for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06896996A JP3524668B2 (en) | 1996-03-01 | 1996-03-01 | Nozzle refractories for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09239503A true JPH09239503A (en) | 1997-09-16 |
| JP3524668B2 JP3524668B2 (en) | 2004-05-10 |
Family
ID=13389020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06896996A Expired - Fee Related JP3524668B2 (en) | 1996-03-01 | 1996-03-01 | Nozzle refractories for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3524668B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007011038A1 (en) * | 2005-07-22 | 2007-01-25 | Krosaki Harima Corporation | Carbon-containing refractory, method for manufacture thereof, and pitch-containing refractory raw material |
| JP2015189640A (en) * | 2014-03-28 | 2015-11-02 | 黒崎播磨株式会社 | Alumina-silicon carbide-carbonaceous brick |
-
1996
- 1996-03-01 JP JP06896996A patent/JP3524668B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007011038A1 (en) * | 2005-07-22 | 2007-01-25 | Krosaki Harima Corporation | Carbon-containing refractory, method for manufacture thereof, and pitch-containing refractory raw material |
| US8182599B2 (en) | 2005-07-22 | 2012-05-22 | Krosaki Harima Corporation | Carbon-containing refractory, production method thereof, and pitch-containing refractory raw material |
| JP2015189640A (en) * | 2014-03-28 | 2015-11-02 | 黒崎播磨株式会社 | Alumina-silicon carbide-carbonaceous brick |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3524668B2 (en) | 2004-05-10 |
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