JPH0437450A - Nozzle for casting wide and thin slab - Google Patents
Nozzle for casting wide and thin slabInfo
- Publication number
- JPH0437450A JPH0437450A JP2139704A JP13970490A JPH0437450A JP H0437450 A JPH0437450 A JP H0437450A JP 2139704 A JP2139704 A JP 2139704A JP 13970490 A JP13970490 A JP 13970490A JP H0437450 A JPH0437450 A JP H0437450A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- fiber
- cao
- casting
- added
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000035939 shock Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、広幅薄肉ノズル鋳造に使用される非ＡＡｔＯ
ａ付着性と、高耐熱衝撃性を有するノズルに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to a non-AAtO
This invention relates to a nozzle that has good adhesion and high thermal shock resistance.
１．０．付着防止を図るために、従来よりＣａＯ・Ｚｒ
Ｏ，−グラファイト質ノズルが使用されてきた。1.0. In order to prevent adhesion, CaO/Zr
O,-graphitic nozzles have been used.
しかしＣａＯ・ＺｒＯ．−グラファイト質ノズルは、Ｃ
ａＯ・ＺｒＯ２固有の熱膨張率の大きさに起因して耐熱
衝撃性がわるいために予熱を充分行なって使用する、或
はアルミナ−グラファイト質ノズルの吐出部近傍部のみ
にぼかし構造でＣａＯ・ＺｒＯ□−グラファイト質を使
用してきた。However, CaO・ZrO. - Graphite nozzle is C
Thermal shock resistance is poor due to the large coefficient of thermal expansion inherent to aO/ZrO2, so it must be sufficiently preheated before use, or CaO/ZrO should be used with a shading structure only in the vicinity of the discharge part of the alumina-graphite nozzle. □-Graphite has been used.
しかしＣａＯ・ＺｒＯ＋−グラファイト質ノズルは、一
般に低強度であり薄肉構造のノズルには使用できない。However, CaO.ZrO+-graphite nozzles generally have low strength and cannot be used for nozzles with thin wall structures.
更に結合剤の多量添加、超微粉骨材の添加、Ａ１．Ｓｉ
などの金属添加、高い成型圧による組織の緻密化等の方
法で熱間強度を向上させた場合、材質の弾性率が強度の
向上と同じ程度、或はそれ以上に上昇してしまう問題点
か挙げられる。Furthermore, addition of a large amount of binder, addition of ultrafine aggregate, A1. Si
If the hot strength is improved by adding metals such as or densifying the structure by high molding pressure, the problem is that the elastic modulus of the material increases to the same degree as the strength improvement, or even more. Can be mentioned.
弾性率の上昇はすなわち耐スポール性の低下を意味する
。広幅薄肉スラブ鋳造用ノズルにおいては、高い破壊エ
ネルギーとともに熱衝撃に対する抵抗性が重要であり、
強度を高くしたいがゆえに耐スポール性を犠牲にするこ
とは、実際の使用上好ましくない。An increase in elastic modulus means a decrease in spall resistance. In nozzles for casting wide thin-walled slabs, high fracture energy and resistance to thermal shock are important.
In actual use, sacrificing spall resistance in order to increase strength is undesirable.
本発明は上記課題に鑑みなされたもので、アルミナ等の
付着の防止とともに高耐熱衝撃性を有する広幅薄肉スラ
ブ鋳造用ノズルを提供する。The present invention has been made in view of the above-mentioned problems, and provides a nozzle for casting wide thin-walled slabs that prevents the adhesion of alumina and the like and has high thermal shock resistance.
前記課題を解決するための本発明は、ジルコニア−グラ
ファイトを主成分とする原料にＣａＯ・ＺｒＯ２ファイ
バーを５〜２０Ｖｏ １％添加したことを特徴とし、ま
た前記添加するＣａＯ・ＺｒＯ，ファイバーの繊維径が
１〜６μｍで繊維長は６０〜１５０μｍである広幅薄肉
スラブ鋳造用ノズルである。The present invention for solving the above problem is characterized in that 5 to 20Vo of CaO/ZrO2 fibers are added to a raw material mainly composed of zirconia-graphite, and the fiber diameter of the CaO/ZrO to be added and the fibers are This is a nozzle for casting wide thin-walled slabs with a fiber length of 1 to 6 μm and a fiber length of 60 to 150 μm.
ノズルの破壊、損傷による主原因は、骨材部より微粒子
マトリックスを主としてクラックが発生する。つまりマ
トリックス部を強化することが重要な技術となる。しか
し前述の添加剤などによるただ単なるマトリックス部の
強化は、組織の弾性率の向上につながり耐熱衝撃性の低
下につながる。The main cause of nozzle destruction and damage is that cracks occur mainly in the fine particle matrix from the aggregate part. In other words, strengthening the matrix part is an important technology. However, mere reinforcement of the matrix using the above-mentioned additives leads to an improvement in the elastic modulus of the structure and a decrease in thermal shock resistance.
本発明で添加するＣａＯ・ＺｒＯ２ファイバーは、Ｃａ
Ｏ・Ｚｒ０ｚファイバーの引抜き効果による破壊エネル
ギーの向上だけを図るもので、その結果として、溶鋼通
湯時の圧力や、瞬間的な熱応力に耐えうるようにするも
のである。The CaO/ZrO2 fiber added in the present invention is CaO
The aim is only to improve the fracture energy due to the drawing effect of the O.Zr0z fiber, and as a result, it is made to be able to withstand the pressure during pouring of molten steel and instantaneous thermal stress.
つまりファイバーの添加により弾性率を増加させずに、
また強度を低下させることなく破壊エネルギーを吸収す
るように最適な径、長さ及び添加量を見いだした。In other words, without increasing the elastic modulus by adding fiber,
We also found the optimum diameter, length, and amount to absorb fracture energy without reducing strength.
ここでＣａＯ−ＺｒＯ２ファイバーの径および長さは、
マトリックスを構成する耐火材料の粒度できまり、本発
明においては、繊維径は１〜６μｍ、長さは６０〜１５
０μｍとする。通常このようなノズルのマトリックスを
構成する粒径は、１〜１０μｍの範囲である。まず繊維
径であるが、通常市販されている０、３〜０．８μｍの
径だと、細かすぎて凝集する傾向も認められ、結果とし
てのファイバー引抜き効果は認められなかった。また１
μｍ以下だと耐火材料との混練時にファイバーの折れが
起こり、所定の繊維長が得られないという問題点もあっ
た。Here, the diameter and length of the CaO-ZrO2 fiber are
It is determined by the particle size of the refractory material constituting the matrix, and in the present invention, the fiber diameter is 1 to 6 μm and the length is 60 to 15 μm.
It is set to 0 μm. Typically, the particle size constituting the matrix of such nozzles ranges from 1 to 10 μm. First, regarding the fiber diameter, the diameter of 0.3 to 0.8 μm, which is commonly available on the market, was too small and tended to aggregate, and as a result, no fiber drawing effect was observed. Also 1
If the diameter is less than .mu.m, there is a problem that the fibers will break when kneaded with the refractory material, making it impossible to obtain a predetermined fiber length.
また６μｍ以上だと粒子添加と同様の効果しか得られな
かった。Moreover, when the particle size was 6 μm or more, only the same effect as the addition of particles could be obtained.
次に繊維長については、６０μｍ以下だとファイバーの
引抜き効果が認められず、径の場合と同様に１５０μｍ
以上のファイバーは繊維の折れか発生し、ファイバー引
抜き効果は認められなかった。Next, regarding the fiber length, if it is less than 60 μm, the fiber pulling effect is not observed, and as in the case of the diameter, it is 150 μm or less.
With the above fibers, some fibers were broken, and no fiber pulling effect was observed.
次にＣａ０−ＺｒＯ□ファイバーの添加量についてであ
るが、５■ｏ１％以下だと破壊エネルギーの上昇は認め
られなかった。また２０Ｖｏ １％以上だとファイバー
のからみ合いにより強度及び破壊エネルギーの極端な低
下が認められた。従って添加量は５〜２０Ｖｏ １％と
した。Next, regarding the amount of Ca0-ZrO□ fiber added, no increase in fracture energy was observed when the amount was less than 5■o1%. In addition, when 20Vo was 1% or more, an extreme decrease in strength and fracture energy was observed due to fiber entanglement. Therefore, the amount added was 5 to 20Vo 1%.
またＣａＯ・ＺｒＯ２ファイバーの表面にカーボンを１
００人程変波覆することは、耐火原料との混線時にファ
イバーの滑りがよくなり、均質混線が短時間でできるこ
とが判明した。In addition, one layer of carbon was added to the surface of the CaO/ZrO2 fiber.
It has been found that changing the wave length by about 0.00 people makes the fiber slippery when mixed with refractory raw materials, and homogeneous cross-talk can be achieved in a short time.
本発明を実施例に基づいて説明する。 The present invention will be explained based on examples.
ファイバーの添加は、乾燥状態の表１に示す配合耐火原
料に遊星型ミキサーで混練した。更にバインダーとして
フェノール樹脂を用いて混練し、成型用配合物を調整し
た。アイソスタティックプレス、乾燥、焼成工程を経て
、広幅薄肉スラブ鋳造用ノズルを得た。これらの試料を
４０ Ｘ ４０ Ｘ １６０闘サイズに加工した後、冷
間３点曲げ強度およびその際の破壊エネルギーを測定し
た。The fibers were added to the dry refractory raw materials shown in Table 1 and kneaded using a planetary mixer. Further, a phenol resin was used as a binder and kneaded to prepare a molding compound. Through isostatic pressing, drying, and firing steps, a wide thin slab casting nozzle was obtained. After processing these samples into a size of 40 x 40 x 160, cold three-point bending strength and fracture energy at that time were measured.
また耐熱衝撃性評価として、熱サイクルスポーリング試
験を行った。すなわち４０ Ｘ ４０ Ｘ １６０ｍ
ｍサイズに加工した耐火性試料を、窒素中で１４００’
Ｃ１Ｏ分加熱した後、３０分字数冷する試験を繰返し、
このときの亀裂発生状況を目視観察により調べ、耐熱衝
撃性を亀裂が発生したときの熱サイクル回数で評価した
。これらの結果をファイバーの添加条件とともに表２に
示す。In addition, a thermal cycle spalling test was conducted to evaluate thermal shock resistance. i.e. 40 x 40 x 160m
A refractory sample processed into m size was heated in nitrogen for 1400'
After heating for C10 minutes, we repeated the test of cooling for 30 minutes,
The occurrence of cracks at this time was examined by visual observation, and the thermal shock resistance was evaluated by the number of thermal cycles when cracks occurred. These results are shown in Table 2 together with the fiber addition conditions.
Claims (2)
ノズル原料にＣａＯ・ＺｒＯ＿２ファイバーを５〜２０
Ｖｏｌに添加したことを特徴とする広幅薄肉スラブ鋳造
用ノズル。(1) 5 to 20 CaO/ZrO_2 fibers are added to the casting nozzle raw material whose main component is zirconia-graphite.
A wide thin slab casting nozzle characterized by adding Vol.
が１〜６μｍで繊維長が６０〜１５０μｍである請求項
（１）記載の広幅薄肉スラブ鋳造用ノズル。(2) The nozzle for casting wide thin slabs according to claim 1, wherein the CaO/ZrO_2 fibers added have a fiber diameter of 1 to 6 μm and a fiber length of 60 to 150 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139704A JPH0437450A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139704A JPH0437450A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437450A true JPH0437450A (en) | 1992-02-07 |
Family
ID=15251478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2139704A Pending JPH0437450A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437450A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107073565A (en) * | 2014-10-31 | 2017-08-18 | 株式会社Posco | Immersion nozzle for continuous casting |
| CN108505145A (en) * | 2018-04-11 | 2018-09-07 | 山东大学 | A kind of calcium zirconate fiber and preparation method thereof |
-
1990
- 1990-05-31 JP JP2139704A patent/JPH0437450A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107073565A (en) * | 2014-10-31 | 2017-08-18 | 株式会社Posco | Immersion nozzle for continuous casting |
| CN107073565B (en) * | 2014-10-31 | 2019-05-10 | 株式会社Posco | Immersion nozzle for continuous casting |
| CN108505145A (en) * | 2018-04-11 | 2018-09-07 | 山东大学 | A kind of calcium zirconate fiber and preparation method thereof |
| CN108505145B (en) * | 2018-04-11 | 2020-10-09 | 山东大学 | Calcium zirconate fiber and preparation method thereof |
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