JP2000344575A - Graphite-containing refractory for melting high purity aluminum - Google Patents
Graphite-containing refractory for melting high purity aluminumInfo
- Publication number
- JP2000344575A JP2000344575A JP11154751A JP15475199A JP2000344575A JP 2000344575 A JP2000344575 A JP 2000344575A JP 11154751 A JP11154751 A JP 11154751A JP 15475199 A JP15475199 A JP 15475199A JP 2000344575 A JP2000344575 A JP 2000344575A
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- powder
- graphite
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Abstract
Description
【０００1】[0001]
【発明の属する技術分野】本発明は、高純度アルミニウ
ム溶解用黒鉛含有耐火物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphite-containing refractory for melting high-purity aluminum.
【０００２】[0002]
【従来の技術】アルミニウム溶解用黒鉛含有耐火物とし
ては、黒鉛坩堝、黒鉛樋、坩堝台等がある。これらの耐
火物は、高熱伝導性に優れ、地金付着が少なく、溶湯汚
染が少ない等の理由から、アルミニウム溶解用として広
く使用されている。例えば、黒鉛坩堝の主組成は、天然
黒鉛及びＳｉＣであって、その他耐酸化成分としてＡ
ｌ、Ｆｅ、Ｓｉ等の金属類やＮａ2Ｏ−ＳｉＯ2−Ａｌ2
Ｏ3等のガラス成分が添加されていた。黒鉛坩堝でアル
ミニウムを溶解する場合、坩堝成分のＳｉはそのまま溶
解し、ガラス成分中のＳｉＯ2はＡｌに還元されＳｉと
なって溶解し、ＳｉＣは酸化されてＳｉＯ2となり、そ
の後Ａｌに還元されＳｉとなって溶解することにより、
微量のＳｉが溶融アルミニウム中に混入する。また、Ｆ
ｅはそのまま溶解し、Ｆｅ2Ｏ3はＡｌに還元されてＦｅ
となって溶解することにより微量のＦｅが溶融アルミニ
ウム中に混入する。アルミダイキャスト製品用の地金で
は、微量のＳｉ、Ｆｅの混入は何ら問題とされていなか
った。2. Description of the Related Art Graphite crucibles, graphite gutters, crucible stands and the like are available as graphite-containing refractories for melting aluminum. These refractories are widely used for melting aluminum because of their excellent high thermal conductivity, little adhesion of metal, and low contamination of molten metal. For example, the main composition of the graphite crucible is natural graphite and SiC, and A
l, Fe, Si and other metals and Na2O-SiO2-Al2
Glass components such as O3 were added. When dissolving aluminum in a graphite crucible, Si in the crucible component dissolves as it is, SiO2 in the glass component is reduced to Al and dissolved as Si, and SiC is oxidized to SiO2 and then reduced to Al to form Si and By dissolving
A small amount of Si is mixed into the molten aluminum. Also, F
e dissolves as it is, Fe2O3 is reduced to Al
As a result, a small amount of Fe is mixed into the molten aluminum. In metal for aluminum die-cast products, the inclusion of trace amounts of Si and Fe has not been a problem at all.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
たように微量のＳｉやＦｅが混入して溶湯汚染が生じる
虞れのある従来の黒鉛坩堝は、フォアナイン以上の高純
度アルミニウムの溶解用としては不適切である。また、
黒鉛坩堝の内面にアルミナ層を形成してＳｉやＦｅの混
入を防止するようにしたものもあるが、熱膨張係数の違
いによりアルミナ層に亀裂が生じてしまう虞れがある。
本発明は、上記した点に鑑みてなされたもので、黒鉛含
有耐火物の特質である耐割れ性、耐酸化性を保持すると
ともに、ＳｉやＦｅの混入による溶湯汚染を可及的に防
止した高純度アルミニウム溶解用黒鉛含有耐火物を提供
することを目的とするものである。However, as described above, the conventional graphite crucible, in which a small amount of Si or Fe may be mixed to cause molten metal contamination, is not suitable for dissolving high-purity aluminum higher than phoanain. Improper. Also,
Although there is an alumina layer formed on the inner surface of the graphite crucible to prevent the incorporation of Si and Fe, the alumina layer may be cracked due to a difference in thermal expansion coefficient.
The present invention has been made in view of the above points, and has retained crack resistance and oxidation resistance, which are characteristics of graphite-containing refractories, and has prevented as much as possible molten metal contamination due to mixing of Si and Fe. An object of the present invention is to provide a graphite-containing refractory for melting high-purity aluminum.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の本発明の高純度アルミニウム溶解用黒鉛含有耐火物
は、黒鉛粉末１０〜７０重量％、炭化硼素粉末１０〜５
０重量％及びＳｉ，Ｆｅ系成分を含まないガラス粉末５
〜３０重量％の混合粉末を、混練、成形、焼成してなる
ことを特徴とする。To achieve the above object, the graphite-containing refractory for dissolving high-purity aluminum of the present invention comprises 10 to 70% by weight of graphite powder and 10 to 5% of boron carbide powder.
Glass powder 5 containing 0% by weight and containing no Si or Fe-based components 5
-30% by weight of a mixed powder is kneaded, molded and fired.
【０００５】[0005]
【発明の作用及び効果】上記構成の高純度アルミニウム
溶解用黒鉛含有耐火物は、黒鉛含有耐火物の特質である
耐割れ性、耐酸化性を保持するとともに、ＳｉやＦｅの
混入による溶湯汚染を可及的に防止できるもので、高純
度アルミニウム溶解用の坩堝、溶湯撹拌部材や保護管等
を製造するための耐火物として最適となる。The graphite-containing refractory for melting high-purity aluminum having the above-described structure retains the crack resistance and oxidation resistance, which are the characteristics of the graphite-containing refractory, and reduces the contamination of the molten metal due to the incorporation of Si and Fe. It can be prevented as much as possible, and is optimal as a refractory for producing a crucible for melting high-purity aluminum, a molten metal stirring member, a protective tube, and the like.
【０００６】[0006]
【発明の実施の形態】本発明の高純度アルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末１０〜７０重量％、炭化
硼素粉末１０〜５０重量％及びＳｉ，Ｆｅ系成分を含ま
ないガラス粉末５〜３０重量％の混合粉末を、混練、成
形、焼成したものである。黒鉛粉末は、天然黒鉛若しく
は人造黒鉛から製造する。黒鉛の含有量が１０重量％以
下では、熱伝導性が低下して熱的な割れを生じやすくな
る。また、７０重量％以上では耐酸化性が低下する。BEST MODE FOR CARRYING OUT THE INVENTION The graphite-containing refractory for melting high-purity aluminum of the present invention comprises 10 to 70% by weight of graphite powder, 10 to 50% by weight of boron carbide powder, and 5 to 50% by weight of glass powder containing no Si or Fe-based components. It is obtained by kneading, molding and firing 30% by weight of a mixed powder. Graphite powder is manufactured from natural graphite or artificial graphite. When the content of graphite is 10% by weight or less, thermal conductivity is reduced and thermal cracks are easily generated. On the other hand, when the content is 70% by weight or more, the oxidation resistance decreases.
【０００７】炭化硼素は耐酸化性に優れている材料であ
るが、１０重量％以下の添加量では耐酸化性が不十分と
なり、５０重量％以上添加しても耐酸化効果は殆ど変わ
りはないばかりか、高価な材料であるためコスト高とな
る。また、過焼結を生じて割れ易くなる。Ｓｉ，Ｆｅ系
成分を含まないガラス粉末の原料としては、Ｎａ2Ｏ−
Ｂ2Ｏ3−ＣａＯ−Ａｌ2Ｏ3からなる組成のガラス等が挙
げられる。このガラス粉末の添加量が５重量％以下であ
ると、耐火物表面にガラス皮膜が形成されず耐酸化性が
劣る。また、３０重量％以上添加すると、熱間強度が低
下して割れ易くなる。[0007] Boron carbide is a material having excellent oxidation resistance. However, the addition of less than 10% by weight results in insufficient oxidation resistance, and the addition of 50% by weight or more hardly changes the oxidation resistance. In addition, the cost is high because the material is expensive. In addition, oversintering occurs and cracks easily occur. As a raw material of glass powder containing no Si or Fe-based components, Na2O-
Glass having a composition of B2O3-CaO-Al2O3, and the like can be given. When the addition amount of the glass powder is 5% by weight or less, a glass film is not formed on the surface of the refractory, and the oxidation resistance is poor. Further, when added in an amount of 30% by weight or more, the hot strength is reduced and cracks are easily caused.
【０００８】（実施例１）実施例１の高純度アルミニウ
ム溶解用黒鉛含有耐火物は、黒鉛粉末４０重量％、炭化
硼素粉末４０重量％、Ｓｉ，Ｆｅ系成分を含まないガラ
ス粉末としてＮａ2Ｏ（３０重量％）−Ｂ2Ｏ3（５０重
量％）−ＣａＯ（１０重量％）−Ａｌ2Ｏ3（１０重量
％）からなる組成のガラス（以下ガラスＡという）粉末
２０重量％の混合粉末を混練、成形、焼成して製造し
た。(Example 1) The graphite-containing refractory for melting high-purity aluminum of Example 1 is composed of 40% by weight of graphite powder, 40% by weight of boron carbide powder, and Na2O (30%) as a glass powder containing no Si or Fe-based components. A mixture of 20% by weight of glass (hereinafter referred to as glass A) powder having a composition of (% by weight) -B2O3 (50% by weight) -CaO (10% by weight) -Al2O3 (10% by weight) is kneaded, molded and fired. Manufactured.
【０００９】（実施例２）実施例２の高純度アルミニウ
ム溶解用黒鉛含有耐火物は、黒鉛粉末４０重量％、炭化
硼素粉末３０重量％、ガラスＡの粉末２０重量％、Ａｌ
2Ｏ3の粉末１０重量％からなる混合粉末を混練、成形、
焼成して製造した。Example 2 The graphite-containing refractory for melting high-purity aluminum of Example 2 was composed of 40% by weight of graphite powder, 30% by weight of boron carbide powder, 20% by weight of glass A powder,
Kneading and molding a mixed powder consisting of 10% by weight of 2O3 powder;
It was manufactured by firing.
【００１０】（比較例１）比較例１のアルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末４０重量％、ＳｉＣ粉末
４０重量％、Ｓｉ粉末１０重量％、Ｎａ2Ｏ（２０重量
％）−ＳｉＯ2（４０重量％）−Ｂ2Ｏ3（３０重量％）
−Ａｌ2Ｏ3（１０重量％）からなる組成のガラス（以下
ガラスＢという）粉末１０重量％からなる混合粉末を混
練、成形、焼成して製造した。Comparative Example 1 The graphite-containing refractory for dissolving aluminum in Comparative Example 1 was composed of 40% by weight of graphite powder, 40% by weight of SiC powder, 10% by weight of Si powder, Na2O (20% by weight) -SiO2 (40% by weight). %)-B2O3 (30% by weight)
A mixed powder composed of 10% by weight of glass (hereinafter referred to as glass B) having a composition composed of -Al2O3 (10% by weight) was kneaded, molded and fired.
【００１１】（比較例２）比較例２のアルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末４０重量％、ＳｉＣ粉末
４０重量％、Ｆｅ粉末１０重量％、ガラスＢの粉末１０
重量％からなる混合粉末を混練、成形、焼成して製造し
た。Comparative Example 2 The graphite-containing refractory for melting aluminum of Comparative Example 2 was composed of 40% by weight of graphite powder, 40% by weight of SiC powder, 10% by weight of Fe powder, and 10% by weight of glass B powder.
It was manufactured by kneading, molding and baking a mixed powder consisting of weight%.
【００１２】（比較例３）比較例３のアルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末８重量％、炭化硼素粉末
４５重量％、ガラスＡの粉末２７重量％、Ａｌ2Ｏ3の粉
末２０重量％からなる混合粉末を混練、成形、焼成して
製造した。Comparative Example 3 The graphite-containing refractory for dissolving aluminum of Comparative Example 3 was composed of 8% by weight of graphite powder, 45% by weight of boron carbide powder, 27% by weight of glass A powder, and 20% by weight of Al2O3 powder. The mixed powder was manufactured by kneading, molding and firing.
【００１３】（比較例４）比較例４のアルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末７５重量％、炭化硼素粉
末１５重量％、ガラスＡの粉末１０重量％からなる混合
粉末を混練、成形、焼成して製造した。Comparative Example 4 The graphite-containing refractory for dissolving aluminum of Comparative Example 4 was prepared by kneading and molding a mixed powder composed of 75% by weight of graphite powder, 15% by weight of boron carbide powder and 10% by weight of glass A powder. It was manufactured by firing.
【００１４】（比較例５）比較例５のアルミニウム溶解
用黒鉛含有耐火物は、黒鉛粉末５０重量％、炭化硼素粉
末８重量％、ガラスＡの粉末２５重量％、Ａｌ2Ｏ3の粉
末１７重量％からなる混合粉末を混練、成形、焼成して
製造した。Comparative Example 5 The graphite-containing refractory for dissolving aluminum of Comparative Example 5 is composed of 50% by weight of graphite powder, 8% by weight of boron carbide powder, 25% by weight of glass A powder, and 17% by weight of Al2O3 powder. The mixed powder was manufactured by kneading, molding and firing.
【００１５】上記実施例１〜２の高純度アルミニウム溶
解用黒鉛含有耐火物及び比較例１〜５のアルミニウム溶
解用黒鉛含有耐火物に対して、熱処理重量減少率、耐熱
衝撃性及び溶融高純度アルミニウムへの他成分の混入量
を測定した。熱処理重量減少率は、３０×３０×３０ｍ
ｍの立方体に切り出したサンプルを、大気中で８００℃
×４８時間保持した後の重量減少率である。耐熱衝撃性
は、５０×５０×５０ｍｍの立方体に切り出したサンプ
ルを１，０００℃×１時間加熱後、水中に投入すること
を１サイクルとし、これを３サイクル繰り返した後のサ
ンプルの亀裂発生度合いにより評価した。また、溶融高
純度アルミニウムへの他成分の混入量は、純度９９．９
９９％（ファイブナイン）の金属アルミニウムを上記実
施例１〜２及び比較例１〜５のアルミニウム溶解用黒鉛
含有耐火物で製造した坩堝で溶解し、６時間保持した時
の他成分の混入量を測定した。The heat treatment weight reduction rate, thermal shock resistance and molten high-purity aluminum were compared with the high-purity graphite-containing refractory of Examples 1-2 and the graphite-containing refractories of Comparative Examples 1-5. The amount of other components mixed into the sample was measured. Heat treatment weight loss rate is 30 × 30 × 30m
A sample cut into a cube of m
× The weight loss rate after holding for 48 hours. The thermal shock resistance was determined by heating a sample cut into a cube of 50 × 50 × 50 mm at 1,000 ° C. × 1 hour and then throwing it into water as one cycle. Was evaluated. The amount of other components mixed in the molten high-purity aluminum was 99.9 purity.
99% (five nines) of metallic aluminum was melted in a crucible made of the graphite-containing refractory for melting aluminum of Examples 1 and 2 and Comparative Examples 1 to 5 and the amount of other components mixed when held for 6 hours. It was measured.
【００１６】表１は、実施例１〜２高純度アルミニウム
溶解用黒鉛含有耐火物及び比較例１〜５のアルミニウム
溶解用黒鉛含有耐火物の組成及び熱処理重量減少率、耐
熱衝撃性及び溶融高純度アルミニウムへの他成分の混入
量の各測定結果を示したものである。Table 1 shows the compositions of the graphite-containing refractories for melting high-purity aluminum in Examples 1 and 2 and the graphite-containing refractories for melting aluminum in Comparative Examples 1 to 5, the heat treatment weight reduction rate, thermal shock resistance and molten high purity. It shows each measurement result of the amount of other components mixed into aluminum.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１により明らかなように、実施例１及び
２については、耐熱衝撃性を有するとともに、他成分の
混入量も１ｐｐｍと極めて少ない。従って、フォアナイ
ン以上の高純度アルミニウム溶解用の坩堝、溶湯撹拌部
材や保護管等を製造するための耐火物として最適とな
る。As is clear from Table 1, Examples 1 and 2 have thermal shock resistance and the amount of other components mixed is extremely small at 1 ppm. Therefore, it is optimal as a refractory for manufacturing a crucible for melting high-purity aluminum higher than phoanain, a molten metal stirring member, a protective tube, and the like.
【００１９】その他、黒鉛粉末、炭化硼素粉末に対し
て、Ａｌ2Ｏ3、ＭｇＯ、ＺｒＯ2等、Ｓｉ、Ｆｅを含ま
ない酸化物の粉末、或いはＢＮ、ＡｌＮ、ＺｒＢ2等、
Ｓｉ、Ｆｅを含まない非酸化物の粉末を添加してもよ
い。In addition, graphite powder, boron carbide powder, Al2O3, MgO, ZrO2, etc., oxide powders not containing Si and Fe, or BN, AlN, ZrB2, etc.
A non-oxide powder containing neither Si nor Fe may be added.
フロントページの続き Ｆターム(参考） 4G032 AA04 AA22 AA23 AA25 AA29 AA34 BA01 4K001 AA02 BA23 GA19 GB12 Continued on front page F-term (reference) 4G032 AA04 AA22 AA23 AA25 AA29 AA34 BA01 4K001 AA02 BA23 GA19 GB12
Claims (1)
末１０〜５０重量％及びＳｉ，Ｆｅ系成分を含まないガ
ラス粉末５〜３０重量％の混合粉末を、混練、成形、焼
成してなることを特徴とする高純度アルミニウム溶解用
黒鉛含有耐火物。1. A mixed powder of 10 to 70% by weight of graphite powder, 10 to 50% by weight of boron carbide powder and 5 to 30% by weight of glass powder not containing Si and Fe-based components is kneaded, molded and fired. A graphite-containing refractory for melting high-purity aluminum, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11154751A JP2000344575A (en) | 1999-06-02 | 1999-06-02 | Graphite-containing refractory for melting high purity aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11154751A JP2000344575A (en) | 1999-06-02 | 1999-06-02 | Graphite-containing refractory for melting high purity aluminum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000344575A true JP2000344575A (en) | 2000-12-12 |
Family
ID=15591122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11154751A Pending JP2000344575A (en) | 1999-06-02 | 1999-06-02 | Graphite-containing refractory for melting high purity aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000344575A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100916145B1 (en) | 2008-01-07 | 2009-09-08 | 조선내화 주식회사 | refractories of submerged entry nozzle for continuos casting |
| CN112144115A (en) * | 2020-09-21 | 2020-12-29 | 无锡市尚领石英科技有限公司 | Quartz crucible with long service life and low deformation rate and preparation method thereof |
-
1999
- 1999-06-02 JP JP11154751A patent/JP2000344575A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100916145B1 (en) | 2008-01-07 | 2009-09-08 | 조선내화 주식회사 | refractories of submerged entry nozzle for continuos casting |
| CN112144115A (en) * | 2020-09-21 | 2020-12-29 | 无锡市尚领石英科技有限公司 | Quartz crucible with long service life and low deformation rate and preparation method thereof |
| CN112144115B (en) * | 2020-09-21 | 2022-02-08 | 无锡市尚领石英科技有限公司 | Quartz crucible with long service life and low deformation rate and preparation method thereof |
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