JPH0694065B2 - For iron castings - Google Patents
For iron castingsInfo
- Publication number
- JPH0694065B2 JPH0694065B2 JP60101072A JP10107285A JPH0694065B2 JP H0694065 B2 JPH0694065 B2 JP H0694065B2 JP 60101072 A JP60101072 A JP 60101072A JP 10107285 A JP10107285 A JP 10107285A JP H0694065 B2 JPH0694065 B2 JP H0694065B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- porous body
- ceramic porous
- ceramic
- excess material
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
Description
【発明の詳細な説明】 産業上の利用分野 本発明は耐熱衝撃性、熱間強度に優れ、鉄鋳物の熔湯を
良好に過し得る鉄鋳物用過材に関する。Description: FIELD OF THE INVENTION The present invention relates to a casting material for iron casting which is excellent in thermal shock resistance and hot strength and which can well pass the molten metal of the iron casting.
従来の技術 従来より、内部連通空間を有する三次元網状の格子構造
をなし、内部を流体が通過する際に流体が格子に衝突を
繰り返しながら流動するようにしたセラミック多孔体、
例えば合成樹脂発泡体から得られるセラミックフォーム
やヌードル状のセラミックをランダムに重ね合せ、或い
は巻くなどして形成したフォーム状セラミックヌードル
等は溶融金属の過材として好適に用いられることが知
られている（特公昭57−35047号、同35049号）。セラミ
ック多孔体をこのような溶融金属の過材として用いる
場合、アルミニウム等の通常の溶融金属を過するに際
しては、数十トンから数百トンの溶融金属を過する必
要から、過材の溶融金属通過面の面積を大きくする
（通常直径900〜3600cmの大きさ）ことによって単位時
間当たりの通過量を多くし、また溶融金属中の夾雑物の
除去率を高く維持する必要から、過材内部での溶融金
属の通過線速度を低くしている。そして、過材をフィ
ルターチャンバー又はタンヂッシュに装着する場合は、
溶融金属による過材への機械的衝撃を避けるため、
過材のフィルターチャンバー又はタンヂッシュへの装着
構造を直接過材上に溶融金属が落下しないような構造
にすると共に、上述したように溶融金属が通過する面の
表面積を大きくした過材への熱衝撃を緩和するため、
過材を装着するフィルターチャンバー又はタンヂッシ
ュを溶融金属の溶融温度付近まで予熱し、これにより
過材の破損を防止することが行なわれている。2. Description of the Related Art Conventionally, a ceramic porous body having a three-dimensional net-like lattice structure having an internal communication space and allowing fluid to flow while repeatedly colliding with the lattice when the fluid passes through the inside,
For example, it is known that a ceramic foam obtained from a synthetic resin foam or a foam-shaped ceramic noodle formed by randomly stacking or winding noodle-shaped ceramics is preferably used as a molten metal excess material. (JP-B 57-35047, 35049). When a ceramic porous body is used as an excess material for such molten metal, when passing ordinary molten metal such as aluminum, it is necessary to pass several tens to several hundreds of tons of molten metal. Since it is necessary to increase the passage amount per unit time by increasing the area of the passage surface (usually the diameter is 900 to 3600 cm) and to keep the removal rate of impurities in the molten metal high, inside the excess material The passing linear velocity of the molten metal is low. And when installing the excess material in the filter chamber or tundish,
To avoid mechanical impact of molten metal on the excess material,
The heat shock to the excess material, which has a structure that prevents the molten metal from falling directly on the excess material and has a large surface area for the molten metal to pass through, as described above. To alleviate
The filter chamber or tundish in which the excess material is mounted is preheated to near the melting temperature of the molten metal, thereby preventing damage to the excess material.
発明が解決しようとする問題点 しかしながら、鉄鋳物の注形においては、数十kgの熔湯
を短時間で砂型内に注湯する場合が多いので、過材も
しくはその近傍を予熱することができず、また熔湯を流
れとして過材中を通過させるような熔湯の落下衝撃を
避けるためのスペースが取り難い場合が多く、このため
融点以上に加熱された熔湯を室温の過材の上に直接落
下させて数秒から数十秒の短時間で過を完了させる方
法が採用されていた。それ故、鉄鋳物の熔湯を過する
セラミツク多孔体製の過材は、厳しい熱衝撃によって
破損し、また熔湯の機械的衝撃によって破損するという
問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in casting an iron casting, it is often the case that several tens of kilograms of molten metal are poured into the sand mold in a short time, so it is possible to preheat the excess material or its vicinity. In many cases, it is difficult to make room for avoiding the impact of the molten metal dropping by passing the molten metal through the excess material. A method was adopted in which it was dropped directly onto the to finish the pass in a short time of several seconds to several tens of seconds. Therefore, there has been a problem that the ceramic porous material that passes through the molten metal of the iron casting is damaged by severe thermal shock and also damaged by the mechanical shock of the molten metal.
本発明は上記事情に鑑みなされたもので、鉄鋳物用の熔
湯を過する場合に、上述したような熱衝撃や機械的衝
撃による破損を防止することができ、鉄鋳物の熔湯を良
好に過することができる鉄鋳物用過材を提供するこ
とを目的とする。The present invention has been made in view of the above circumstances, and when passing molten metal for iron casting, it is possible to prevent damage due to thermal shock or mechanical impact as described above, and good molten iron casting is possible. It is an object of the present invention to provide an overcast material for iron castings.
問題点を解決するための手段及び作用 即ち、本発明は上記目的を達成するため、内部連通空間
を有する三次元網状の格子構造をなすセラミック多孔体
からなる鉄鋳物用過材において、セラミック多孔体が
炭化珪素を70重量％以上、酸化アルミニウムを２〜20重
量％及び酸化珪素を３〜20重量％含有し、かつリン酸塩
を実質的に含有しない組成を有すると共に、内部連通空
間の長径が１〜8mmであることを特徴とする鉄鋳物用
過材を提供するものである。Means and Actions for Solving Problems That is, in order to achieve the above-mentioned object, the present invention provides a ceramic porous body in an iron casting casting material comprising a ceramic porous body having a three-dimensional mesh lattice structure having an internal communication space. Contains 70% by weight or more of silicon carbide, 2 to 20% by weight of aluminum oxide and 3 to 20% by weight of silicon oxide, and has substantially no phosphate, and the major axis of the internal communication space is The present invention provides an overcast material for iron castings, which is characterized in that it is 1 to 8 mm.
本発明過材によれば、セラミック多孔体を上記の特定
の組成に構成し、かつ鉄鋳物用過材として適した空孔
径（内部連通空間径）としたことにより、熱間強度が高
く、熱膨張率が低く、熱伝導率が高く、しかも室温強度
も高く、耐熱衝撃性に優れているので、過材の破損を
可及的に防止して鉄鋳物の熔湯を過し得ると共に、熔
湯を短時間で確実に過することができる。According to the present invention material, the ceramic porous body has the above-mentioned specific composition, and has the pore diameter (internal communication space diameter) suitable as the material for iron casting. It has a low expansion coefficient, high thermal conductivity, high room temperature strength, and excellent thermal shock resistance, so it is possible to prevent damage to the excess material as much as possible and to pass the molten metal of the iron casting. You can definitely pass the hot water in a short time.
以下、本発明につき更に詳しく説明する。Hereinafter, the present invention will be described in more detail.
本発明の鉄鋳物用過材は、内部連通空間を有する三次
元網状の格子構造をなすセラミック多孔体からなるもの
であるが、この種のセラミック多孔体としては、合成樹
脂発泡体にセラミック泥漿を付着させ、これを乾燥、焼
結することによって得られるセラミックフォームやヌー
ドル状セラミックをランダムに重ね合せ或いは巻くなど
して形成したフォーム状セラミックヌードルなどが挙げ
られ、特にセラミックフォーム、なかでもセル膜のない
軟質ポリウレタンフォームから得られる正十二面体の篭
型格子構造を有するセラミックフォームが好適に用いら
れる。The overcast material for iron casting of the present invention is composed of a ceramic porous body having a three-dimensional mesh lattice structure having an internal communication space. As the ceramic porous body of this type, a synthetic resin foam is made of ceramic slurry. Examples include ceramic foam obtained by adhering and drying, and sintering, and foam ceramic noodles formed by randomly stacking or winding noodle-shaped ceramics.Particularly, ceramic foam, especially cell membrane A ceramic foam having a regular dodecahedron cage type lattice structure obtained from a flexible polyurethane foam which is not used is preferably used.
而して、本発明過材は、このようなセラミック多孔体
を構成するセラミックの組成を炭化珪素を主成分とし、
セラミック全体の70％（重量％、以下同じ）以上含有さ
せると共に、酸化アルミニウムを２〜20％、酸化珪素を
３〜20％含有させるようにしたものである。即ち、炭化
珪素の量を70％以上とすることにより、セラミック多孔
体の格子の熱間強度が増大し、熔湯のヘッド及び流動抵
抗の結果として発生する重力に高温において確実に耐え
ることができると共に、熱伝導率が大きくなりかつ熱膨
張率が小さくなって、耐熱衝撃性が著るしく向上する。
また、焼成時に炭化珪素が酸化して生成する酸化珪素の
ムライト化を推進するため、酸化アルミニウムが２〜20
％含有していることが必要である。Thus, the excess material of the present invention has the composition of the ceramic that constitutes such a ceramic porous body, with silicon carbide as the main component,
70% or more (by weight, the same applies hereinafter) of the whole ceramic is contained, and aluminum oxide is contained in 2 to 20% and silicon oxide is contained in 3 to 20%. That is, by setting the amount of silicon carbide to 70% or more, the hot strength of the lattice of the ceramic porous body is increased, and the gravity generated as a result of the melt head and the flow resistance can be reliably endured at high temperature. At the same time, the thermal conductivity increases and the thermal expansion coefficient decreases, and the thermal shock resistance is significantly improved.
Further, in order to promote the mullitization of silicon oxide generated by the oxidation of silicon carbide during firing, aluminum oxide is added in an amount of 2 to 20%.
% Must be contained.
更に、酸化珪素を３〜20％含有させることにより、室温
強度を保持し、熔湯を過材上に落下せしめた場合の機
械的衝撃性に確実に耐えることができるものである。従
って、本発明過材によれば、鉄鋳物の熔湯を室温の
過材の上に直接落下させて過を行なうような場合で
も、その熱衝撃による破損、熔湯の機械的衝撃による破
損を防止することができる。Further, by containing 3 to 20% of silicon oxide, the room temperature strength can be maintained and the mechanical shock resistance when the molten metal is dropped onto the excess material can be surely endured. Therefore, according to the excess material of the present invention, even when the molten iron casting is directly dropped on the excess material at room temperature, the damage caused by the thermal shock and the mechanical impact of the molten metal is prevented. Can be prevented.
これに対し、炭化珪素量が70％より少ない場合は、セラ
ミック多孔体の格子の熱間強度が小さくなり、耐熱衝撃
性も低下する。また、酸化アルミニウム量が２％より少
ない場合は、焼成時における酸化珪素のムライト化効果
が劣る。酸化珪素は特に200℃前後の熱膨張率を上昇せ
しめるので、耐熱衝撃性の面では好ましいとはいえない
が、その含有量が３％より少ない場合はセラミック多孔
体の室温強度が低下し、熔湯を過材上に落下させたと
きの機械的衝撃性に耐えられない。更に、酸化アルミニ
ウム及び酸化珪素がそれぞれ20％を超えると耐熱性及び
熱間強度が低下し、上記いずれの場合も本発明の目的を
達成し得ない。On the other hand, when the amount of silicon carbide is less than 70%, the hot strength of the lattice of the ceramic porous body becomes small and the thermal shock resistance also deteriorates. If the amount of aluminum oxide is less than 2%, the effect of mullitization of silicon oxide during firing is poor. Silicon oxide is not preferable in terms of thermal shock resistance since it increases the coefficient of thermal expansion around 200 ° C., but if its content is less than 3%, the room temperature strength of the ceramic porous body decreases, and It cannot withstand the mechanical shock when hot water is dropped on the excess material. Further, if the aluminum oxide content and the silicon oxide content exceed 20%, respectively, the heat resistance and hot strength decrease, and the object of the present invention cannot be achieved in any of the above cases.
なお、上記各成分のより好ましい範囲は、炭化珪素が75
〜95％、酸化アルミニウムが２〜10％、酸化珪素が３〜
10％である。A more preferable range of the above components is 75
~ 95%, aluminum oxide 2-10%, silicon oxide 3 ~
10%.
また、本発明においては、セラミック組成中にリン酸塩
が含有すると酸化アルミニウムと反応してリン酸アルミ
ニウムを生成し、これが200℃前後の熱膨張率を著るし
く増大せしめるので、リン酸塩を実質的に含まない組成
にするものである。Further, in the present invention, when the phosphate is contained in the ceramic composition, it reacts with aluminum oxide to form aluminum phosphate, which significantly increases the thermal expansion coefficient around 200 ° C. The composition is substantially free.
更に、本発明過材を構成するセラミック多孔体は、そ
の熱膨張係数が100〜220℃の温度範囲の平均で8.5×10
-6/℃以下、より望ましくは6.5×10-6/℃以下とするこ
とが好ましく、これによって耐熱衝撃性を更に向上させ
ることができる。Further, the ceramic porous body constituting the present invention has a thermal expansion coefficient of 8.5 to 10 on average in the temperature range of 100 to 220 ° C.
It is preferably −6 / ° C. or less, more preferably 6.5 × 10 −6 / ° C. or less, which can further improve the thermal shock resistance.
本発明過材は、セラミック多孔体を以上のような組成
に形成すると共に、セラミック多孔体の内部連通空間の
長径（格子が形成する空孔の長径）を１〜8mmに形成す
るもので、これにより鉄鋳物の熔湯を短時間で良好に
過し得るものである。これに対し、長径が1mmより小さ
いと熔湯の流動抵抗が大きくなり、注湯に時間がかかる
ので、注湯が完了する前に熔湯が硬化し、不良品が発生
する場合が多発し、また8mmを超えると熔湯の流動抵抗
が低く過ぎて熔湯中の酸化物が湯口上部に浮上するタイ
ミングが取れず、かつセラミック多孔体の格子表面積が
小さくなり、熔湯中の酸化物を付着除去する効果が低下
し、いずれも本発明の目的を達成し得ない。なお、空孔
直径のより好ましい範囲は２〜8mmである。The excess material of the present invention forms the ceramic porous body with the above composition, and forms the major diameter of the internal communication space of the ceramic porous body (the major diameter of the pores formed by the lattice) to 1 to 8 mm. Therefore, the molten metal of the iron casting can be satisfactorily passed in a short time. On the other hand, if the major axis is less than 1 mm, the flow resistance of the molten metal becomes large and it takes a long time to pour the molten metal, so that the molten metal hardens before the pouring is completed and defective products often occur. If it exceeds 8 mm, the flow resistance of the molten metal is too low to allow the oxide in the molten metal to float to the top of the spout, and the lattice surface area of the ceramic porous body becomes small, causing the oxide in the molten metal to adhere. The effect of removal is reduced, and none of them can achieve the object of the present invention. A more preferable range of pore diameter is 2 to 8 mm.
また、セラミック多孔体は、鉄鋳物の熔湯をより良好に
過する点から、嵩密度0.3〜0.6g/cm3に形成すること
が好ましい。更に、過材の形状は適宜選定され、例え
ば円柱状、錐台状、逆錐台状等の形状に形成できる。Further, the ceramic porous body is preferably formed to have a bulk density of 0.3 to 0.6 g / cm 3 from the viewpoint of better passing the molten iron casting. Further, the shape of the excess material is appropriately selected, and can be formed into, for example, a cylindrical shape, a truncated cone shape, an inverted truncated cone shape, or the like.
なお、本発明において、セラミック多孔体を製造する方
法としては通常採用されている方法を用いることができ
る。In the present invention, as a method for producing the ceramic porous body, a method usually adopted can be used.
また、本発明過材の使用態様も制限はなく、通常の
過方法が採用されるが、熔湯を室温の過材の上に直接
落下させて数秒及至数十秒の短時間で過を完了する方
法が有効に採用され得る。Also, there is no limitation on the usage mode of the overwork material of the present invention, and a normal overworking method is adopted, but the overrun is completed in a short time of several seconds to several tens of seconds by dropping the molten metal directly onto the overwork material at room temperature. The method of doing can be effectively adopted.
〔実施例１〜６、比較例１〜５〕 第１表に示す割合で、炭化珪素、アルミナ、シリカ粉末
100重量部にポリビニルアルコール５重量部、消泡剤0.1
重量部及び水25重量部を添加し、高粘性のセラミック泥
漿を作成した。内部連通空間の長径が6mmの三次元網状
骨格構造のポリウレタンフォームをこの泥漿に含浸し
た。含浸後、余剰な泥漿をロールにより除去し、60℃で
16時間乾燥した。次いで1280℃で20分間焼成し、セラミ
ック多孔体を得た。[Examples 1 to 6 and Comparative Examples 1 to 5] Silicon carbide, alumina, and silica powders in the proportions shown in Table 1.
100 parts by weight of polyvinyl alcohol 5 parts by weight, antifoaming agent 0.1
A highly viscous ceramic slurry was prepared by adding 25 parts by weight of water and 25 parts by weight of water. The slurry was impregnated with a polyurethane foam having a three-dimensional net-like skeleton structure with a major axis of the internal communication space of 6 mm. After impregnation, remove excess sludge with a roll, and at 60 ℃
It was dried for 16 hours. Then, it was fired at 1280 ° C. for 20 minutes to obtain a ceramic porous body.
得られたセラミック多孔体の強度は３点曲げ方法で行な
った。熱間たわみは第１図に示す方法で行ない、耐熱性
の評価とした。この場合、サンプル１（厚さ21mm、巾35
mm、長さ120mm）を支持体2,2（支持体2,2間の距離100m
m）上に乗せ、1400℃に30分間保持した場合のたわみ量
（Δｌ）を測定した。熱膨張係数は熱機械分析装置によ
り250℃〜室温間を測定し耐熱衝撃性の評価とした。こ
れらの結果を第１表に示す。The strength of the obtained ceramic porous body was measured by a three-point bending method. The hot deflection was performed by the method shown in FIG. 1 to evaluate the heat resistance. In this case, sample 1 (21mm thick, 35mm wide)
mm, length 120 mm) support 2,2 (distance between support 2,2 100 m
Then, the amount of deflection (Δl) was measured when it was placed on m) and kept at 1400 ° C. for 30 minutes. The thermal expansion coefficient was measured between 250 ° C. and room temperature with a thermomechanical analyzer and evaluated as thermal shock resistance. The results are shown in Table 1.
また、内部連通空間の径が、6,0.8,9mmのポリウレタン
フォームを用い、実施例１と同じ条件でセラミック多孔
体を作成し、鉄鋳物（ダクタイル）による通湯性を評価
した。結果を第２表に示す。 Further, using a polyurethane foam having a diameter of the internal communication space of 6,0.8,9 mm, a ceramic porous body was prepared under the same conditions as in Example 1, and the hot water permeability by an iron casting (ductile) was evaluated. The results are shown in Table 2.
発明の効果 以上説明したように、本発明の鉄鋳物用過材は、熱間
強度、耐熱衝撃性に優れ、熔湯が直接落下しても破損し
難いものであり、このように破損を防止して短時間で良
好な過を達成することができるものである。 EFFECTS OF THE INVENTION As described above, the overcast material for iron casting of the present invention is excellent in hot strength and thermal shock resistance, and is hard to be broken even if the molten metal directly drops, thus preventing damage. Therefore, a good pass can be achieved in a short time.
【図面の簡単な説明】 第１図は耐熱性の評価を得るための熱間たわみを示す方
法である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a method showing hot deflection for obtaining heat resistance evaluation.
Claims (1)
造をなすセラミック多孔体からなる鉄鋳物用過材にお
いて、セラミック多孔体が炭化珪素を70重量％以上、酸
化アルミニウムを２〜20重量％及び酸化珪素を３〜20重
量％含有し、かつリン酸塩を実質的に含有しない組成を
有すると共に、内部連通空間の長径が１〜8mmであるこ
とを特徴とする鉄鋳物用過材。1. An iron casting casting material comprising a ceramic porous body having a three-dimensional mesh lattice structure having an internal communication space, wherein the ceramic porous body contains 70% by weight or more of silicon carbide and 2 to 20% by weight of aluminum oxide. And an excess material for iron castings, which has a composition containing 3 to 20% by weight of silicon oxide and contains substantially no phosphate, and the internal communication space has a major axis of 1 to 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60101072A JPH0694065B2 (en) | 1985-05-13 | 1985-05-13 | For iron castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60101072A JPH0694065B2 (en) | 1985-05-13 | 1985-05-13 | For iron castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61259870A JPS61259870A (en) | 1986-11-18 |
| JPH0694065B2 true JPH0694065B2 (en) | 1994-11-24 |
Family
ID=14290897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60101072A Expired - Lifetime JPH0694065B2 (en) | 1985-05-13 | 1985-05-13 | For iron castings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0694065B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8918048D0 (en) * | 1989-08-08 | 1989-09-20 | Foseco Int | Ceramic foam filters |
| US5190897A (en) * | 1989-08-08 | 1993-03-02 | Foseco International Limited | Ceramic foam filters |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1546833A (en) * | 1923-06-30 | 1925-07-21 | Carborundum Co | Refractory article and method of making the same |
| JPS4929304A (en) * | 1972-07-18 | 1974-03-15 | ||
| JPS58151382A (en) * | 1982-02-26 | 1983-09-08 | 株式会社ブリヂストン | Porous ceramic structure |
| JPS59111967A (en) * | 1982-12-17 | 1984-06-28 | 株式会社ブリヂストン | Ceramic porous body |
| EP0126847A1 (en) * | 1984-02-17 | 1984-12-05 | Georg Fischer Aktiengesellschaft | Ceramic filter |
-
1985
- 1985-05-13 JP JP60101072A patent/JPH0694065B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1546833A (en) * | 1923-06-30 | 1925-07-21 | Carborundum Co | Refractory article and method of making the same |
| JPS4929304A (en) * | 1972-07-18 | 1974-03-15 | ||
| JPS58151382A (en) * | 1982-02-26 | 1983-09-08 | 株式会社ブリヂストン | Porous ceramic structure |
| JPS59111967A (en) * | 1982-12-17 | 1984-06-28 | 株式会社ブリヂストン | Ceramic porous body |
| EP0126847A1 (en) * | 1984-02-17 | 1984-12-05 | Georg Fischer Aktiengesellschaft | Ceramic filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61259870A (en) | 1986-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| EXPY | Cancellation because of completion of term |