JP3197572B2 - Refractory material for melting Al-Li alloy - Google Patents
Refractory material for melting Al-Li alloyInfo
- Publication number
- JP3197572B2 JP3197572B2 JP07457791A JP7457791A JP3197572B2 JP 3197572 B2 JP3197572 B2 JP 3197572B2 JP 07457791 A JP07457791 A JP 07457791A JP 7457791 A JP7457791 A JP 7457791A JP 3197572 B2 JP3197572 B2 JP 3197572B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- refractory material
- parts
- melting
- weight
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ａｌ−Ｌｉ合金の溶解
用として好適な侵食抵抗性に優れる耐火材料に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material excellent in erosion resistance suitable for melting an Al-Li alloy.
【０００２】[0002]
【従来の技術】Ａｌ−Ｌｉ合金の溶解は、Ｌｉの酸化を
防ぐためアルゴンガス雰囲気中でおこなわれる。したが
って、溶解炉は電気炉、誘導加熱炉が操業上適してお
り、溶解用耐火物のライニング方式としては、予め成形
焼成された坩堝をライニングするタイプ、および金枠を
使用して成形・焼結するラミング耐火材によりライニン
グするタイプとがある。しかし、ラミング耐火材による
ライニング方式は、溶解金属へ非金属介在物が混入する
おそれがあるため、品質管理上問題がある。これに対し
て坩堝をライニングする方式には、このような問題はな
く、現場施工作業の合理化の観点からも好ましいタイプ
である。2. Description of the Related Art Al-Li alloys are dissolved in an argon gas atmosphere to prevent oxidation of Li. Therefore, electric furnaces and induction heating furnaces are suitable for the operation of the melting furnace. For the lining method of the refractory for melting, a type in which a crucible preformed and baked is lined, and a molding and sintering using a metal frame There is a type that is lined with a ramming refractory material. However, the lining method using the ramming refractory material has a problem in quality control because nonmetallic inclusions may be mixed into the molten metal. On the other hand, the method of lining the crucible does not have such a problem, and is a preferable type from the viewpoint of rationalizing on-site construction work.
【０００３】一般に、アルミニウムおよびアルミニウム
合金を溶解する坩堝の材料としては、黒鉛を主体とする
カーボン材およびＳｉＣを構成成分とする黒鉛質耐火物
が使用されているが、黒鉛質耐火物を、例えばＬｉ0.5
〜4.0 wt％を含むＡｌ−Ｌｉ合金溶解用坩堝として使用
した場合には、Ｌｉが耐火材料と反応して耐火物中に浸
透、透潤し、耐火物の損傷を早めるという難点がある。In general, as a material of a crucible for melting aluminum and an aluminum alloy, a carbon material mainly composed of graphite and a graphite refractory mainly composed of SiC are used. Li0.5
When used as a crucible for melting an Al-Li alloy containing up to 4.0 wt%, there is a drawback that Li reacts with the refractory material and penetrates and permeates into the refractory to accelerate the damage of the refractory.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記従来の
問題点を解消し、溶融Ａｌ−Ｌｉ合金との反応を抑えて
耐侵食性を向上させたＡｌ−Ｌｉ合金溶解用耐火材料を
提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a refractory material for dissolving an Al-Li alloy which has improved erosion resistance by suppressing the reaction with the molten Al-Li alloy. The purpose is to do.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めの本発明によるＡｌ−Ｌｉ合金溶解用耐火材料は、Ｃ
（カーボン）３０〜５０重量部、ＳｉＣ１０〜３５重量
部、Ａｌ５〜３０重量部および結合剤と不可避的不純物
からなることを構成上の特徴とする。In order to achieve the above object, a refractory material for melting an Al--Li alloy according to the present invention comprises:
(Carbon) 30 to 50 parts by weight, 10 to 35 parts by weight of SiC, 5 to 30 parts by weight of Al, a binder and unavoidable impurities.
【０００６】本発明は、従来の黒鉛とＳｉＣを主成分と
する黒鉛質耐火物のＳｉＣ成分をＳｉＣおよびＡｌ2 Ｏ
3 成分に置換した三成分系とし、それぞれの成分比率を
特定することによって溶融Ａｌ−Ｌｉ合金に対する耐浸
透性、耐浸潤性を向上させた耐火物組織としたものであ
る。According to the present invention, the SiC component of the conventional graphite refractory containing graphite and SiC as main components is SiC and Al 2 O.
This is a refractory structure in which a three-component system substituted with three components is specified, and by specifying the respective component ratios, the penetration resistance and the infiltration resistance to the molten Al-Li alloy are improved.
【０００７】本発明の構成主成分となるＣ（カーボン）
としては、コークス、炭素、黒鉛など通常の炭素質物を
使用することができるが、材質的の安定な黒鉛を用いる
ことが好ましい。Ｃ（カーボン）の含有量は、カーボン
特性が最も発揮できる３０〜５０重量部とする。この含
有量が３０重量部未満では耐食性、耐火性が十分でな
く、５０重量部を越えると強度が減退する。C (carbon) which is a main component of the present invention
As the material, a normal carbonaceous material such as coke, carbon, and graphite can be used, but it is preferable to use graphite whose material is stable. The content of C (carbon) is set to 30 to 50 parts by weight at which the carbon properties can be exhibited most. If this content is less than 30 parts by weight, the corrosion resistance and fire resistance are not sufficient, and if it exceeds 50 parts by weight, the strength decreases.
【０００８】ＳｉＣは、耐火材料の熱膨張係数を低く保
持し、強度と耐酸化性を向上させるために機能する成分
で、好適な含有量は１０〜３５重量部である。この含有
量が１０重量部未満では強度と耐酸化性の向上効果が小
さく、３５重量部を上廻るとＡｌ2 Ｏ3 の相対的含有量
が少なくなるため、Ｌｉの浸透、浸潤を防止する効果が
十分発揮されなくなる。[0008] SiC is a component that functions to keep the coefficient of thermal expansion of the refractory material low and to improve the strength and oxidation resistance. The preferred content is 10 to 35 parts by weight. If the content is less than 10 parts by weight, the effect of improving strength and oxidation resistance is small, and if it exceeds 35 parts by weight, the relative content of Al 2 O 3 is reduced, so that the effect of preventing penetration and infiltration of Li is prevented. Will not be fully exhibited.
【０００９】Ａｌ2 Ｏ3 は、Ｌｉ化合物の浸透、浸潤を
抑え、侵食抵抗を向上させるのに有効に作用する。好適
な含有量は５〜３０重量部であり、５重量部未満では浸
食抵抗を向上させる効果が小さく、３０重量部を越える
と、Ａｌ2 Ｏ3 自身の熱膨張係数が大きいことに起因し
て耐火材料の耐スポール性が低下するとともに、ＳｉＣ
の相対的含有量が少なくなるため、強度と耐酸化性の減
退を招く。Ａｌ2 Ｏ3 （アルミナ）の材質としては、焼
結アルミナ、溶融アルミナ、焼ボーキサイトなどＡｌ2
Ｏ3 含有率が高くＳｉＯ2 成分の含有率が小さいものが
本発明の目的に適しており、これらのアルミナは粒度２
００メッシュ以下の微粉状態で使用するのが望ましい。
微粉で使用すると、Ａｌ−Ｌｉ合金溶解時に耐火材料中
に浸透するＬｉがアルミナと反応して高温で安定なγ−
ＬｉＡｌＯ2 （融点1700℃) を生成し、耐火材料のマト
リックスを強化する。Al 2 O 3 effectively acts to suppress penetration and infiltration of a Li compound and to improve erosion resistance. The preferred content is 5 to 30 parts by weight. If it is less than 5 parts by weight, the effect of improving erosion resistance is small, and if it exceeds 30 parts by weight, the thermal expansion coefficient of Al 2 O 3 itself is large. The spall resistance of the refractory material decreases and the SiC
, The strength and oxidation resistance are reduced. As the material of the Al 2 O 3 (alumina), sintered alumina, fused alumina, etc. baked bauxite Al 2
Those having a high content of O 3 and a low content of the SiO 2 component are suitable for the purpose of the present invention.
It is desirable to use it in the state of fine powder of 00 mesh or less.
When used as fine powder, Li that penetrates into the refractory material when the Al-Li alloy is melted reacts with the alumina, and γ-
Produces LiAlO 2 (melting point 1700 ° C.) and strengthens the matrix of refractory material.
【００１０】前記Ｃ（カーボン）、ＳｉＣ、アルミナ
（Ａｌ2 Ｏ3 ）の他、本発明の耐火材料には、黒鉛質耐
火物の製造に必要な結合剤（バインダー）、カーボン自
身が保有する灰分から生成される成分、黒鉛質、耐火物
の酸化防止のためのガラス成分、Ａｌ2 Ｏ3 の不純物Ｓ
ｉＯ2 などが含まれる。In addition to C (carbon), SiC and alumina (Al 2 O 3 ), the refractory material of the present invention includes a binder (binder) necessary for the production of graphite refractories and an ash held by carbon itself. Component, graphite, glass component for preventing refractory oxidation, Al 2 O 3 impurity S
iO 2 and the like.
【００１１】本発明のＡｌ−Ｌｉ合金溶解用耐火材料
は、Ｃ（カーボン）、ＳｉＣおよびＡｌ2 Ｏ3 の微粉末
を前記の組成割合になるように配合し、タールピッチあ
るいは熱硬化性樹脂のような結合材と混練して所定の坩
堝形状にモールド成形したのち、不活性雰囲気中に保持
された加熱炉で６００℃以上の温度で焼成処理すること
によって製造することができる。The refractory material for melting an Al-Li alloy of the present invention is prepared by blending fine powders of C (carbon), SiC and Al 2 O 3 so as to have the above-mentioned composition ratio. After being kneaded with such a binder and molded into a predetermined crucible shape, it can be manufactured by firing at a temperature of 600 ° C. or more in a heating furnace maintained in an inert atmosphere.
【００１２】[0012]
【作用】従来の黒鉛とＳｉＣを主成分とする黒鉛質耐火
材料では、Ａｌ−Ｌｉ合金溶解時、例えばつぎのような
反応が生じ、耐火材料中のＳｉＣとＡｌ−Ｌｉとの反応
生成物が大気中の湿分（Ｈ2 Ｏ）、Ｎ2 、Ｏ2と接触し
てアンモニア、カーバイド等を発生し、耐火物組織を崩
壊する。 Ｌｉ＋Ｓｉ＋Ｈ2 Ｏ→ＬｉＳｉ−ＯＨ＋Ｈ2 Ｎ2 Ｈ2 →ＮＨ3 ＡｌＮ＋Ｈ2 Ｏ→Ａｌ2 Ｏ3 ＋ＮＨ3 これに対して、所定量のＡｌ2 Ｏ3 を含有する本発明の
耐火材料においては、溶融したＡｌ−Ｌｉ合金と接触す
ると高温で安定なγ−ＬｉＡｌＯ2 が生成し、この化合
物がバリヤー層となってＬｉの浸透、浸潤を抑える機能
を営む。反応生成物が大気中のＨ2 Ｏ、Ｎ2 、Ｏ2 と接
触してもアンモニア等の発生はみられず、とくに湿分
（Ｈ2 Ｏ）に対して安定である。With a conventional graphite refractory material containing graphite and SiC as main components, the following reaction occurs, for example, when the Al-Li alloy is dissolved, and a reaction product of SiC and Al-Li in the refractory material is formed. Contact with atmospheric moisture (H 2 O), N 2 , and O 2 to generate ammonia, carbide, etc., and disintegrate the refractory structure. In contrast Li + Si + H 2 O → LiSi-OH + H 2 N 2 H 2 → NH 3 AlN + H 2 O → Al 2 O 3 + NH 3, in the refractory material of the present invention containing Al 2 O 3 of a predetermined amount, the molten When it comes into contact with an Al-Li alloy, stable γ-LiAlO 2 is generated at a high temperature, and this compound acts as a barrier layer and functions to suppress the infiltration and infiltration of Li. Even when the reaction product comes into contact with H 2 O, N 2 , and O 2 in the atmosphere, generation of ammonia or the like is not observed, and the product is particularly stable against moisture (H 2 O).
【００１３】[0013]
【実施例】以下、本考案の実施例を比較例と対比して説
明する。 実施例 Ｃ（カーボン）粉末４１重量部、ＳｉＣ粉末（２００メ
ッシュ以下）２５重量部、Ａｌ2 Ｏ3 粉末１５重量部を
タールピッチで混練して坩堝形状にモールド成形し、つ
いで窒素ガス雰囲気の加熱炉中で1000℃の温度で焼成処
理して耐火坩堝を作製した。得られた坩堝を使用し、誘
導溶解炉でＡｌ２．５％Ｌｉ合金を溶解した。５回溶解
後、坩堝組織を調査したが、全く異常は認められなかっ
た。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in comparison with comparative examples. Example 41 parts by weight of C (carbon) powder, 25 parts by weight of SiC powder (200 mesh or less) and 15 parts by weight of Al 2 O 3 powder were kneaded at a tar pitch, molded into a crucible shape, and then heated in a nitrogen gas atmosphere. The refractory crucible was prepared by firing in a furnace at a temperature of 1000 ° C. Using the obtained crucible, an Al2.5% Li alloy was melted in an induction melting furnace. After melting five times, the crucible structure was examined, but no abnormality was found.
【００１４】比較例 カーボン４１重量部とＳｉＣ４０重量部およびタールピ
ッチで構成された組織の耐火坩堝を使用し、誘導溶解炉
でＡｌ２．５％合金を溶解した。５回溶解後、坩堝組織
を調査したところ、Ｌｉが浸透し、損傷しているところ
が数箇所認められた。Comparative Example A refractory crucible having a structure composed of 41 parts by weight of carbon, 40 parts by weight of SiC and tar pitch was used to melt an Al2.5% alloy in an induction melting furnace. After melting five times, the crucible structure was examined. As a result, several places where Li had penetrated and were damaged were found.
【００１５】[0015]
【発明の効果】以上のとおり、本発明のＣ−Ａｌ2 Ｏ3
−ＳｉＣからなる三成分系の耐火材料は、ＳｉＣとＬｉ
およびＬｉ化合物との反応によりＳｉＣが分解すること
がないためＬｉの浸透、浸潤が極めて少なくなり、耐火
材料の寿命が大幅に向上する。As described above, the C-Al 2 O 3 of the present invention is
Ternary refractory materials composed of SiC and LiC
In addition, since SiC is not decomposed by the reaction with the Li compound, the permeation and infiltration of Li are extremely reduced, and the life of the refractory material is greatly improved.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大園 智哉 三重県四日市市小古曽東２−２−２ 株 式会社アリシウム内 (72)発明者 山本 君二 岐阜県多治見市大畑町３−１ (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 35/00 - 35/84 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tomoya Ozono 2-2-2 Kogiso Higashi, Yokkaichi-shi, Mie Inside Alysium Co., Ltd. Field surveyed (Int. Cl. 7 , DB name) C04B 35/00-35/84
Claims (2)
Ｃ１０〜３５重量部、Ａｌ2 Ｏ3 ５〜３０重量部および
結合剤と不可避的不純物で構成されてなることを特徴と
するＡｌ−Ｌｉ合金溶解用耐火材料。1. 30 to 50 parts by weight of C (carbon), Si
C10~35 parts, Al 2 O 3 5~30 parts by weight of Al-Li alloy melting refractory material characterized by comprising consist of binder and unavoidable impurities.
下の微粉を使用する請求項１記載のＡｌ−Ｌｉ合金溶解
用耐火材料。2. The refractory material for melting an Al—Li alloy according to claim 1, wherein a fine powder having a particle size of 200 mesh or less is used as Al 2 O 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07457791A JP3197572B2 (en) | 1991-03-14 | 1991-03-14 | Refractory material for melting Al-Li alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07457791A JP3197572B2 (en) | 1991-03-14 | 1991-03-14 | Refractory material for melting Al-Li alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04285065A JPH04285065A (en) | 1992-10-09 |
| JP3197572B2 true JP3197572B2 (en) | 2001-08-13 |
Family
ID=13551176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07457791A Expired - Fee Related JP3197572B2 (en) | 1991-03-14 | 1991-03-14 | Refractory material for melting Al-Li alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3197572B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101910883B1 (en) * | 2017-06-07 | 2018-12-20 | 심영택 | Systems and Methods of Monitoring Concentration of Dissolved Hydrogen in Water |
-
1991
- 1991-03-14 JP JP07457791A patent/JP3197572B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101910883B1 (en) * | 2017-06-07 | 2018-12-20 | 심영택 | Systems and Methods of Monitoring Concentration of Dissolved Hydrogen in Water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04285065A (en) | 1992-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |