JP2781482B2 - Filter media for molten aluminum - Google Patents
Filter media for molten aluminumInfo
- Publication number
- JP2781482B2 JP2781482B2 JP3300188A JP30018891A JP2781482B2 JP 2781482 B2 JP2781482 B2 JP 2781482B2 JP 3300188 A JP3300188 A JP 3300188A JP 30018891 A JP30018891 A JP 30018891A JP 2781482 B2 JP2781482 B2 JP 2781482B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- inorganic binder
- molten aluminum
- aluminum
- filter medium
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミニウム溶湯中から
固形不純物を濾過するためのアルミニウム溶湯用濾材に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium for molten aluminum for filtering solid impurities from the molten aluminum.
【０００２】[0002]
【従来の技術】アルミニウムの薄板や箔はアルミニウム
溶湯をインゴットに鋳造し、これを圧延して製造され
る。ところが、アルミニウム溶湯に含まれる金属酸化物
や耐火物の微小破片等の固形不純物がそのままインゴッ
ト中に混入すると、これを圧延して薄板や箔等を製造す
る過程でピンホールや表面欠陥が発生することがある。
これを防ぐには、溶湯中から固形不純物を除去する必要
があり、そのために、特公昭５２−２２３２７号では、
骨材粒子を結合するために使用する無機質結合材の原料
組成が、SiO2１０〜５０重量％、 B2O3 ５〜２０重量％
を含んだものが提案されている。また、本出願人が先に
出願した特開平１−１２７１６８号では、無機質結合材
の原料組成として、 B2O3 １５〜８０重量％、Al2O3 ２
〜６０重量％、CaO ０〜３０重量％、MgO ５〜５０重量
％を含んだものが記載されている。2. Description of the Related Art Aluminum sheets and foils are produced by casting molten aluminum into an ingot and rolling it. However, when solid impurities such as metal oxides and small pieces of refractory contained in the molten aluminum are directly mixed into the ingot, pinholes and surface defects are generated in the process of rolling and manufacturing thin plates and foils. Sometimes.
To prevent this, it is necessary to remove solid impurities from the molten metal. For this reason, Japanese Patent Publication No.
The raw material composition of the inorganic binder used to bind the aggregate particles is SiO 2 10 to 50% by weight, B 2 O 3 5 to 20% by weight
Have been proposed. Also, in Japanese Patent Application Laid-Open No. 1-127168 filed earlier by the present applicant, as a raw material composition of the inorganic binder, 15 to 80% by weight of B 2 O 3 and Al 2 O 3 2
It contains about 60% by weight, 0-30% by weight of CaO, and 5-50% by weight of MgO.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た特公昭５２−２２３２７号のアルミニウム溶湯用濾材
においては、無機質結合材中の SiO2を含むため、濾材
とアルミニウム溶湯との濡れ性が良好でアルミニウム溶
湯の濾材への含浸性は高いものの、無機質結合材中の S
iO2 がアルミニウム溶湯と反応して遊離シリコンを生成
し、これが溶湯内に混入してアルミニウム溶湯の汚染を
生じさせ、アルミニウム製品の性能低下の原因となって
いた。また、このことは無機質結合材をアルミニウム溶
湯が浸食することを意味するから、長期間にわたって使
用するうちに濾材が強度低下を来して濾材が崩れ、大ト
ラブルとなる危険性があった。However, in the filter medium for molten aluminum disclosed in Japanese Patent Publication No. 52-22327, since the inorganic binder contains SiO 2 , the wettability between the filter medium and the molten aluminum is good, and Although the impregnation of the molten metal into the filter medium is high, the S in the inorganic binder
The iO 2 reacts with the molten aluminum to produce free silicon, which is mixed into the molten metal to cause contamination of the molten aluminum, which causes a deterioration in the performance of the aluminum product. In addition, this means that the inorganic binder is eroded by the molten aluminum, and there is a danger that the filter will lose its strength and be broken down during a long period of use, resulting in serious trouble.
【０００４】また、特開平１−１２７１６８号のアルミ
ニウム溶湯用濾材では、無機質結合材中に SiO2 を含ま
ないため、アルミニウム溶湯を汚染する恐れはない。し
かも結合材表面に9Al2O3・2B2O3 という結晶を析出させ
るため、耐食性に富み、又その結晶が針状であるため、
非金属介在物などの異物を捕獲し易いという長所があっ
た。しかしながら、結合材中に SiO2 を含まないために
アルミニウム溶湯と濡れ難く、又、その針状結晶の比表
面積が大きいため、通湯性のバラツキが発生することも
しばしば見られた。In the filter medium for molten aluminum disclosed in JP-A-1-127168, since the inorganic binder does not contain SiO 2 , there is no risk of contaminating the molten aluminum. Moreover, since 9Al 2 O 3・ 2B 2 O 3 crystal is precipitated on the surface of the binder, it is rich in corrosion resistance, and since the crystal is acicular,
There is an advantage that foreign substances such as nonmetallic inclusions are easily captured. However, since the binder did not contain SiO 2 , it was difficult to wet with the aluminum melt, and the specific surface area of the acicular crystals was large, so that variations in water permeability were often observed.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明者は、上
記した従来の問題を解決するため種々検討を行なったと
ころ、無機質結合材の原料組成を、特開平１−１２７１
６８号を基礎とし、かつSiO2を所定量含有させることに
より、アルミニウム溶湯との濡れ性を改善し、またアル
ミニウム溶湯の汚染を防止でき、且つ耐食性に優れたア
ルミニウム溶湯用濾材が得られることを見出し、本発明
を完成したものである。即ち、本発明によれば、焼結ア
ルミナ、電融アルミナ、炭化珪素および窒化珪素の１種
以上よりなる骨材粒子を無機質結合材により結合させた
アルミニウム溶湯用濾材であって、骨材粒子１００重量
部に対して４〜２０重量部の無機質結合材にて結合して
なり、該無機質結合材の原料組成が、B2O3１５〜４０重
量％、Al2O3２０〜４５重量％、SiO2１５〜２５重量
％、残部はMgO、CaO、SrOの１種以上よりなるととも
に、該無機質結合材中に生成する9Al 2 O 3 ・2B 2 O 3 の針状
結晶の長さが１０μｍ以下であることを特徴とするアル
ミニウム溶湯用濾材が提供される。 In order to solve the above-mentioned conventional problems, the present inventor has conducted various studies.
Based on No. 68 and containing a predetermined amount of SiO 2 , it is possible to improve the wettability with the aluminum melt, prevent contamination of the aluminum melt, and obtain a filter material for aluminum melt having excellent corrosion resistance. Heading, the present invention has been completed. That is, according to the present invention, there is provided a filter medium for molten aluminum in which aggregate particles made of at least one of sintered alumina, electrofused alumina, silicon carbide and silicon nitride are bound by an inorganic binder. be attached at the inorganic binder 4-20 parts by weight per part by weight of the raw material composition of the inorganic binder, B 2 O 3 15 to 40 wt%, Al 2 O 3 20 to 45 wt%, SiO 2 15-25% by weight, the balance being MgO, CaO, when consisting of one or more SrO together
The acicular 9Al 2 O 3 · 2B 2 O 3 to produce the said inorganic binder in
A filter material for molten aluminum is provided , wherein the length of the crystal is 10 μm or less .
【０００６】[0006]
【作用】本発明のアルミニウム溶湯用濾材において、骨
材粒子１００重量部に対して無機質結合材を４〜２０重
量部使用することにより、強度が高く、且つ早期に目詰
りを起こすことのない濾材を得ることができる。無機質
結合材が４重量部未満では結合部の厚さが薄くなって濾
材の強度が不足し、一方２０重量部を超えると骨材粒子
間の空隙を無機質結合材が埋める傾向となって濾過効率
が低下するので好ましくない。なお、無機質結合材の最
適な添加量は上述の範囲内で骨材粒径に応じて異なり、
また骨材粒子としては電融アルミナ、焼結アルミナ等の
アルミナ質粒子のほか、炭化珪素、窒化珪素等のいずれ
も使用することができ、又、それらの組合せも使用する
ことができる。In the filter medium for molten aluminum according to the present invention, by using 4 to 20 parts by weight of the inorganic binder with respect to 100 parts by weight of the aggregate particles, the filter medium has high strength and does not cause early clogging. Can be obtained. When the amount of the inorganic binder is less than 4 parts by weight, the thickness of the bond is thin and the strength of the filter medium is insufficient. On the other hand, when the amount exceeds 20 parts by weight, the voids between the aggregate particles tend to be filled with the inorganic binder and the filtration efficiency is increased. Is undesirably reduced. The optimal amount of the inorganic binder varies depending on the particle size of the aggregate within the above range,
As the aggregate particles, in addition to alumina particles such as fused alumina and sintered alumina, any of silicon carbide, silicon nitride and the like can be used, and a combination thereof can also be used.
【０００７】また、本発明では、無機質結合材の原料組
成は B2O3を１５〜４０重量％、Al2O3 を２０〜４５重
量％含むので、濾材の焼成時には１４００℃程度で十分
に溶融することができる。 B2O3 はアルミニウム溶湯に
対する耐食性を向上させる観点から１５重量％以上含ま
れることが必要で、又 B2O3 ４０重量％以上では結合材
の溶融状態での粘性が低下し、焼成時に濾材より流出し
てしまうため、４０重量％未満であることが必要であ
る。また、MgO 、CaO 及びSrO の１種以上を添加した理
由は、主として溶融温度を適切な範囲内に納めるためで
あり、この溶融温度が過剰に高くなる場合には B2O3 の
飛散という問題を生ずる。In the present invention, since the raw material composition of the inorganic binder contains 15 to 40% by weight of B 2 O 3 and 20 to 45% by weight of Al 2 O 3 , about 1400 ° C. is sufficient when firing the filter medium. Can be melted. B 2 O 3 is required to be included from the viewpoint of improving the corrosion resistance against molten aluminum 15 wt% or more, and B in the 2 O 3 40 wt% or more reduces the viscosity in the molten state of the binder, the filter medium at the time of firing It is necessary that the content be less than 40% by weight, because it is more likely to flow out. The reason for adding one or more of MgO, CaO and SrO is mainly to keep the melting temperature within an appropriate range. If the melting temperature becomes excessively high, the problem of scattering of B 2 O 3 is raised. Is generated.
【０００８】また、本発明では、無機質結合材中に SiO
2 を１５〜２５重量％含む。このことによってアルミニ
ウム溶湯との濡れ性がよくなり、アルミニウム溶湯の通
湯量を増加させることができる。 SiO2 が１５重量％未
満では濡れ性が低く、２５重量％を超えるとアルミニウ
ム溶湯中に遊離シリコンが溶出する恐れがあるので好ま
しくない。なお、この無機質結合材の添加形態は、いわ
ゆる生原料でもフリット化した原料でもよいが、後者の
方が加熱時に均一な溶融状態が得られて結晶化が促進さ
れる点でより好ましい。さらに、本発明の濾材を製造す
るに当り、濾材焼成時の冷却速度を７０℃／Hrより速く
することによって、濾材の無機質結合材中に生成する 9
Al2O3 ・2B2O3の針状結晶の長さを１０μｍ以下とする
ことができる。これによってアルミニウム溶湯の通湯性
がよくなり、また、アルミニウム溶湯に対する耐食性も
向上し、６８０〜７５０℃の使用温度でも軟化すること
がなく、一方アルミニウム溶湯用濾材として使用上安全
な８００℃（アルミニウム溶湯収容槽を予め８００℃ま
で加熱するため）における抗折強度５０kg/cm2以上を得
ることができる。In the present invention, the inorganic binder contains SiO 2
2 in an amount of 15 to 25% by weight. As a result, the wettability with the molten aluminum is improved, and the amount of the molten aluminum can be increased. If SiO 2 is less than 15% by weight, wettability is low, and if it exceeds 25% by weight, free silicon may be eluted in the molten aluminum, which is not preferable. The addition form of the inorganic binder may be a so-called raw material or a fritted material, but the latter is more preferable in that a uniform molten state is obtained upon heating and crystallization is promoted. Further, in producing the filter medium of the present invention, the cooling rate at the time of firing the filter medium is made higher than 70 ° C./Hr, so that the filter medium is formed in the inorganic binder.
The length of the acicular crystal of Al 2 O 3 .2B 2 O 3 can be set to 10 μm or less. This improves the flowability of the molten aluminum, improves the corrosion resistance to the molten aluminum, does not soften even at the operating temperature of 680 to 750 ° C, and is 800 ° C (aluminum) which is safe for use as a filter medium for molten aluminum. (Because the molten metal storage tank is heated to 800 ° C. in advance), a bending strength of 50 kg / cm 2 or more can be obtained.
【０００９】[0009]
【実施例】以下、本発明を実施例に基づき更に詳細に説
明するが、本発明はこれらの実施例に限られるものでは
ない。 （実施例１〜９） 骨材原料として電融アルミナ＃２０を使用し、これを結
合させる無機質結合材は、その組成と骨材原料１００重
量部に対する添加量を変化させ、さらに、その形態を生
原料の場合と、ガラス化（フリット化）して粉砕した場
合の２種類について行なった。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. (Examples 1 to 9 ) An electrofused alumina # 20 was used as an aggregate raw material, and the inorganic binder for binding the same was changed in its composition and the amount added to 100 parts by weight of the aggregate raw material. Two types of raw materials and a case of vitrification (fritting) and pulverization were performed.
【００１０】上記の骨材原料と無機質結合材原料にデキ
ストリンと適量の水を添加して混練し、外径１００mm
φ、内径６０mmφ、長さ９００mmのパイプ状成形体を作
製した。この成形体を乾燥後１４００℃まで昇温し、５
時間保持した後、自然冷却する方法で焼成を行ない、ア
ルミニウム溶湯用濾材の試験体を作製した。上記によっ
て得られた試験体について後述のような評価試験を行な
った。その結果を表１に示す。表１の結果より、無機質
結合材の組成および骨材粒子１００重量部に対する無機
質結合材の添加量が本発明の範囲内にあるものについて
は、各種の濾材特性が良好であることが分かった。な
お、実施例４については9Al2O3・2B2O3 の結晶の長さが
１０μｍを超えるため、総合評価は多少低下する。[0010] Dextrin and an appropriate amount of water are added to the above-mentioned raw material for the aggregate and the raw material for the inorganic binder and kneaded.
A pipe-shaped molded body having a diameter φ of 60 mmφ and a length of 900 mm was produced. After drying this molded body, the temperature was raised to 1400 ° C.
After holding for a time, firing was performed by a method of natural cooling to prepare a test piece of a filter medium for molten aluminum. The test specimen obtained as described above was subjected to an evaluation test as described below. Table 1 shows the results. From the results shown in Table 1, it was found that various filter media characteristics were good for the composition of the inorganic binder and the amount of the inorganic binder added to 100 parts by weight of the aggregate particles within the range of the present invention. The length of the crystal of Example 4 in For 9Al 2 O 3 · 2B 2 O 3 since exceeding 10 [mu] m, overall evaluation somewhat reduced.
【００１１】（比較例１〜５） 骨材原料として電融アルミナ＃２０を使用し、これを結
合させる無機質結合材の組成および骨材粒子１００重量
部に対する結合材の添加量を表１に示すようにし、これ
にデキストリンと適量の水を添加して乾燥し、実施例１
〜９と同様のパイプ状成形体を作製し、実施例１〜９と
同様の条件で焼成してアルミニウム溶湯用濾材の試験体
を作製した。上記によって得られた試験体について実施
例１〜９と同様に評価試験を行なった。その結果を表１
に示す。表１の結果より、無機質結合材の組成および骨
材粒子１００重量部に対する結合材の添加量が本発明の
範囲外であるものについては濾材特性が良くないことが
分かった。(Comparative Examples 1-5) Table 1 shows the composition of the inorganic binder for binding the fused alumina # 20 as a raw material of the aggregate and the amount of the binder added to 100 parts by weight of the aggregate particles. Then, dextrin and an appropriate amount of water were added thereto, followed by drying.
Manufactured in the same manner as the pipe-shaped molded body and 1-9, to prepare a test body of molten aluminum filter material was calcined under the same conditions as in Example 1 to 9. Evaluation tests were performed on the test pieces obtained in the same manner as in Examples 1 to 9 . Table 1 shows the results.
Shown in From the results shown in Table 1, it was found that those having a composition of the inorganic binder and an additive amount of the binder with respect to 100 parts by weight of the aggregate particles which are out of the range of the present invention have poor filter medium properties.
【００１２】[0012]
【表１】 [Table 1]
【００１３】上記の実施例および比較例について行なっ
た評価項目と評価方法について説明する。 １）結晶長さ パイプ状試験体の無機質結合材中に
生成する9Al2O3・2B2O3の結晶の長さ。１５００倍の顕
微鏡写真（ＳＥＭ）で測定。 ２）抗折強度(kg/cm2) 常温強度 パイプ状試験体のままアムスラー試験機に
よる３点曲げ試験を行なう。 熱間強度 パイプ状試験体から１３０mm×２０mm×１
５mmのピース状試験片を切り出し、温度８００℃、スパ
ン１００mmで３点曲げ試験を行なう。The evaluation items and evaluation methods performed for the above-described examples and comparative examples will be described. 1) 9Al 2 O 3 · 2B 2 length of O 3 crystals to produce the inorganic binding material in the crystal length pipe-shaped test specimen. Measured at 1500x micrograph (SEM). 2) Flexural strength (kg / cm 2 ) Room temperature strength Perform a three-point bending test using an Amsler testing machine with the pipe-shaped specimen. Hot strength 130mm x 20mm x 1 from pipe-shaped test specimen
A 5 mm piece-shaped test piece is cut out and subjected to a three-point bending test at a temperature of 800 ° C. and a span of 100 mm.
【００１４】３）空隙率 試験体の見掛気孔率を
測定して空隙率とした。 ４）成分溶出量 ＪＩＳ ５０５６合金１０重量部に
対して、試験体サンプル１重量部の割合で８００℃のア
ルミニウム溶湯中に浸漬し、２４時間後にアルミニウム
をサンプリングして化学分析を行ない、処理前のアルミ
ニウム成分との差を溶出量とした。 ５）アルミニウム含浸性 深さ３５０mmのパイプの底部に試験体を固定し、７００
℃のアルミニウム溶湯を入れて保持する。一定時間後に
試験体を取り出してアルミニウムの含浸を確認する。こ
の試験はアルミニウムを含浸するまでの時間で評価す
る。 ６）介在物捕集性（Ｂ除去率） 試験体の１cm2 単位当り１kgのアルミニウム溶湯を通過
させ、通湯前後のアルミニウム溶湯中のＢの含有量を分
析し、Ｂの減少率をＢの除去率とした。3) Porosity The apparent porosity of the test specimen was measured and defined as the porosity. 4) Elution amount of component 10 parts by weight of JIS 5056 alloy was immersed in a molten aluminum at 800 ° C. at a ratio of 1 part by weight of a test sample, and after 24 hours, aluminum was sampled and subjected to chemical analysis. The difference from the aluminum component was taken as the elution amount. 5) Aluminum impregnation A test piece was fixed to the bottom of a pipe having a depth of 350 mm,
C. Add and hold the aluminum melt at ℃. After a certain time, the test specimen is taken out and the impregnation with aluminum is confirmed. This test evaluates the time until the aluminum is impregnated. 6) Inclusion trapping property (B removal rate) 1 kg of aluminum melt per 1 cm 2 unit of the test specimen was passed, and the B content in the aluminum melt before and after passing the molten metal was analyzed. The removal rate was used.
【００１５】（実施例１０） 骨材原料として１４〜２８メッシュの焼結アルミナを使
用し、この焼結アルミナ１００重量部に対し、無機質結
合材として、 B2O3 ２５重量％、Al2O3 ３０重量％、 S
iO2 ２０重量％、MgO １５重量％、CaO １０重量％の組
成のものをフリット化して１０重量部添加し、さらに、
実施例１〜９と同様に、デキストリンと適量の水を添加
して混練し、外径１００mmφ、内径６０mmφ、長さ９０
０mmのパイプ状成形体を作製した。この成形体を乾燥後
１３００℃まで昇温し、８時間保持した後、８０℃／Hr
で冷却した。上記の方法で得られた１４本の試験体を組
合わせてカートリッジにし、これにＪＩＳ １０００系
のアルミニウム溶湯を通湯した。１０セット評価を行な
った結果、最大通湯量と最小通湯量とのバラツキは、従
前品の４５０ton に対して１５０ton であった。また、
この試験体の無機質結合材中に生成した 9Al2O3・2B2O3
の針状結晶の長さは１０μｍ以下であった。なお、上
記の従前品としては、特開平１−１２７１６８号に示す
濾材であって、無機質結合材の原料組成が、 B2O3 ３５
重量％、Al2O3 ３０重量％、CaO ２０重量％、MgO １５
重量％からなるものを用いた。(Example 10 ) A sintered alumina of 14 to 28 mesh was used as an aggregate material, and B 2 O 3 25% by weight and Al 2 O were used as an inorganic binder with respect to 100 parts by weight of the sintered alumina. 3 30% by weight, S
20% by weight of iO 2 , 15% by weight of MgO, and 10% by weight of CaO are fritted and added by 10 parts by weight.
In the same manner as in Examples 1 to 9 , dextrin and an appropriate amount of water were added and kneaded, and the outer diameter was 100 mmφ, the inner diameter was 60 mmφ, and the length was 90 mm.
A 0 mm pipe-shaped compact was produced. After drying this molded body, the temperature was raised to 1300 ° C. and held for 8 hours.
And cooled. The 14 test specimens obtained by the above method were combined into a cartridge, and a JIS 1000-series molten aluminum was passed through the cartridge. As a result of the evaluation of 10 sets, the variation between the maximum hot water flow rate and the minimum hot water flow rate was 150 ton against 450 ton of the conventional product. Also,
9Al 2 O 3・ 2B 2 O 3 formed in the inorganic binder of this specimen
Was 10 μm or less in length. The above-mentioned conventional product is a filter medium disclosed in JP-A-1-127168, wherein the raw material composition of the inorganic binder is B 2 O 3 35
Wt%, Al 2 O 3 30 wt%, CaO 20 wt%, MgO 15
What consists of weight% was used.
【００１６】[0016]
【発明の効果】以上説明したように、本発明のアルミニ
ウム溶湯用濾材によれば、骨材粒子を相互に結合させる
無機質結合材中に SiO2 を１５〜２５重量％の範囲含む
ので、濾材とアルミニウム溶湯との濡れ性がよく、9Al2
O3・2B2O3 の結晶長さを１０μｍ以下に抑えることによ
り、アルミニウム溶湯の通湯性を安定化することができ
るとともに、アルミニウム溶湯を遊離シリコンにより汚
染することがない。さらに、骨材粒子１００重量部に対
して無機質結合材を４〜２０重量部使用することによ
り、強度が高く、且つ早期に目詰りを起こすことのない
濾材を得ることができる。As described in the foregoing, according to an aluminum melt medium of the present invention, because it contains a range of SiO 2 15 to 25% by weight inorganic binder in coupling the aggregate particles to each other, and the filter medium Good wettability with molten aluminum, 9Al 2
By suppressing crystal length of O 3 · 2B 2 O 3 to 10μm or less, it is possible to stabilize the passing water of the molten aluminum, there is no possibility of contaminating by free silicon molten aluminum. Furthermore, by using 4 to 20 parts by weight of the inorganic binder with respect to 100 parts by weight of the aggregate particles, it is possible to obtain a filter medium having high strength and without causing early clogging.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−28285（ＪＰ，Ａ) 特開 平４−301040（ＪＰ，Ａ) 特開 平２−147159（ＪＰ，Ａ) 特公 昭52−22327（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) B22D 43/00 B01D 39/20──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-28285 (JP, A) JP-A-4-301040 (JP, A) JP-A-2-147159 (JP, A) 22327 (JP, B2) (58) Fields investigated (Int. Cl. 6 , DB name) B22D 43/00 B01D 39/20
Claims (1)
および窒化珪素の１種以上よりなる骨材粒子を無機質結
合材により結合させたアルミニウム溶湯用濾材であっ
て、骨材粒子１００重量部に対して４〜２０重量部の無
機質結合材にて結合してなり、該無機質結合材の原料組
成が、B2O3１５〜４０重量％、Al2O3２０〜４５重量
％、SiO2１５〜２５重量％、残部はMgO、CaO及びSrOの
１種以上よりなるとともに、該無機質結合材中に生成す
る9Al 2 O 3 ・2B 2 O 3 の針状結晶の長さが１０μｍ以下であ
ることを特徴とするアルミニウム溶湯用濾材。1. A filter material for molten aluminum in which aggregate particles made of at least one of sintered alumina, electrofused alumina, silicon carbide and silicon nitride are bonded by an inorganic binder, and the aggregate particles are contained in 100 parts by weight of the aggregate particles. be attached at the inorganic binder 4-20 parts by weight for the raw material composition of the inorganic binder, B 2 O 3 15 to 40 wt%, Al 2 O 3 20~45 wt%, SiO 2 15 -25% by weight, with the balance being one or more of MgO, CaO and SrO , and the formation in the inorganic binder.
That 9Al 2 O 3 · 2B 2 O 3 acicular der is 10μm or less length of the crystal
Molten aluminum filter material, characterized in that that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300188A JP2781482B2 (en) | 1991-11-15 | 1991-11-15 | Filter media for molten aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3300188A JP2781482B2 (en) | 1991-11-15 | 1991-11-15 | Filter media for molten aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05138339A JPH05138339A (en) | 1993-06-01 |
| JP2781482B2 true JP2781482B2 (en) | 1998-07-30 |
Family
ID=17881795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3300188A Expired - Lifetime JP2781482B2 (en) | 1991-11-15 | 1991-11-15 | Filter media for molten aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2781482B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0790400A (en) * | 1993-09-14 | 1995-04-04 | Ngk Insulators Ltd | Filtrating material for molten metal and treatment of molten metal |
| JP2796565B2 (en) * | 1995-07-19 | 1998-09-10 | 三井金属鉱業株式会社 | Filter for aluminum melt filtration |
| JP3129675B2 (en) * | 1997-04-16 | 2001-01-31 | 三井金属鉱業株式会社 | Ceramic filter and method of manufacturing the same |
| JP2002178137A (en) * | 2000-12-19 | 2002-06-25 | Tokyo Yogyo Co Ltd | Aluminum melting and holding furnace |
| CA2517770C (en) * | 2005-08-31 | 2014-12-02 | Norgen Biotek Corporation | Industrial silicon carbide filtration method |
| JP4701301B2 (en) * | 2009-10-09 | 2011-06-15 | 三井金属鉱業株式会社 | Filtration filter for molten aluminum |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5222327B2 (en) * | 1972-05-15 | 1977-06-16 | ||
| JPH0818884B2 (en) * | 1987-07-24 | 1996-02-28 | 日本碍子株式会社 | Filter material for molten metal |
| JP2945160B2 (en) * | 1991-03-28 | 1999-09-06 | 日本碍子株式会社 | Filter media for molten metal |
-
1991
- 1991-11-15 JP JP3300188A patent/JP2781482B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05138339A (en) | 1993-06-01 |
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