JP3375650B2 - Continuous casting mold powder for copper alloy - Google Patents
Continuous casting mold powder for copper alloyInfo
- Publication number
- JP3375650B2 JP3375650B2 JP29818791A JP29818791A JP3375650B2 JP 3375650 B2 JP3375650 B2 JP 3375650B2 JP 29818791 A JP29818791 A JP 29818791A JP 29818791 A JP29818791 A JP 29818791A JP 3375650 B2 JP3375650 B2 JP 3375650B2
- Authority
- JP
- Japan
- Prior art keywords
- copper alloy
- mold powder
- continuous casting
- atmosphere
- active
- 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
- 239000000843 powder Substances 0.000 title claims description 43
- 229910000881 Cu alloy Inorganic materials 0.000 title claims description 40
- 238000009749 continuous casting Methods 0.000 title claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 24
- 229910052723 transition metal Inorganic materials 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910000314 transition metal oxide Inorganic materials 0.000 claims 1
- 150000003624 transition metals Chemical class 0.000 description 11
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- -1 for example Chemical compound 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、活性金属を含有する銅
合金の連続鋳造時に使用するモールドパウダに関する。
【０００２】
【従来の技術】酸素との化学的親和力が銅よりも大きい
金属（以下、活性金属という）、例えばチタン、クロ
ム、ジルコニウム等を含有する銅合金（以下、「上記銅
合金」という）の連続鋳造に当たっては、活性金属の歩
留、およびインゴット品質を向上させるためには、「上
記銅合金」中の活性金属の酸化を防止することが不可欠
であり、それには「上記銅合金」を大気と接触させない
ようにする必要がある。「上記銅合金」を溶解する際に
は、溶解炉内部を真空またはアルゴンガス等を流すこと
により不活性雰囲気とすることで「上記銅合金」と大気
との接触を遮断することができる。また、溶融した「上
記銅合金」を真空または不活性雰囲気中で鋳型内に鋳造
することができるが、真空チャンバー等、容積が限られ
た容器の中での鋳造はいわゆる造塊法に限定され、しか
もこれでは得られたインゴットを熱間圧延する前に鍛
造、皮剥き等の加工が必要となるため、歩留およびコス
ト面からみて、良好な鋳肌が得られ、かつ直接熱間圧延
が可能な連続鋳造法での鋳造が望ましい。
【０００３】
【発明が解決しようとする課題】しかしながら、連続鋳
造法により水冷した貫通鋳型内へ溶融した「上記銅合
金」を鋳造する際には、鋳型上部での「上記銅合金」と
大気との接触を遮断することは困難であり、「上記銅合
金」中の活性金属が酸化され、生成した酸化物はいわゆ
る介在物となってインゴット中に混濁し、製品の品質を
劣化させる。このことは、「上記銅合金」の連続鋳造に
当たって大きな問題となっていた。
【０００４】そこで、大気中で連続鋳造する際に「上記
銅合金」と大気との接触を遮断させるには、モールドパ
ウダを使用して溶湯表面を被覆することが有効であるこ
とは特開昭６０−２２７９５７号公報によって公知であ
り、特にモールドパウダ中にカーボンを添加し、大気中
の酸素とモールドパウダ中のカーボンとが反応すること
はあっても、大気中の酸素と「上記銅合金」中の活性金
属とは反応しないようにすることが必要である。
【０００５】しかしながら、モールドパウダ中にカーボ
ンを添加すると、作業環境が著しく悪化すること、鋳型
直下で噴出してインゴットを水冷する二次冷却水内にカ
ーボン粉が混濁し、噴出ノズルに詰まりが発生するこ
と、さらに使用したモールドパウダの廃棄処理等に大き
な支障をきたす等の問題があった。
【０００６】本発明はかかる事情に鑑み完成されたもの
であり、「上記銅合金」と大気との接触を遮断し、かつ
作業環境の悪化、ノズル詰まり、使用後のモールドパウ
ダの処理等に支障をきたさないモールドパウダを提供す
ることを目的としている。
【０００７】
【課題を解決するための手段】本発明者は「上記銅合
金」と大気との接触を遮断し、かつ作業環境の悪化、ノ
ズル詰まり、使用後のモールドパウダの処理等に支障を
きたさないモールドパウダを開発することを目的とし
て、鋭意研究を重ねた。その結果、本発明者はモールド
パウダ中に酸素との化学的親和力が銅よりも大きい遷移
金属、すなわち活性遷移金属の酸化物のうち、遷移金属
元素の原子価が＋２価である低級酸化物を含有させれ
ば、大気中の酸素はモールドパウダ中の活性遷移金属の
低級酸化物と優先的に反応し、「上記銅合金」中の活性
金属はほとんど酸化されないことを見出し、本発明をな
すに至った。
【０００８】本発明は上記知見に基づいたものであり、
酸素との化学的親和力が銅よりも大きい遷移金属の酸化
物のうち、遷移金属元素の原子価が＋２価である低級酸
化物を０．５〜９０重量％含有させることを特徴とした
活性金属を含有する銅合金用の連続鋳造モールドパウダ
である。
【０００９】本発明における低級酸化物とは、モールド
パウダに添加する酸化物ＹｍＯｎの化学量論性を示すｍ
およびｎの比、ｎ／ｍが１の値をとる酸化物を指す。モ
ールドパウダ中へ添加する低級酸化物の量は、０．５重
量％未満では大気中の酸素との反応が速やかに進行して
しまい、「上記銅合金」中の活性金属と大気中の酸素と
の反応を抑制する効果が期待できない。また９０重量％
を越えると、モールドパウダの他の成分が溶解して作用
する凝固した鋳片と鋳型間の潤滑効果が著しく低下し、
良好な鋳肌のインゴットが得られないばかりか、連続鋳
造中にブレークアウトが発生する危険性がある。したが
って、モールドパウダ中に添加する低級酸化物の量は、
０．５〜９０重量％の範囲がよい。
【００１０】
【作用】以下に、本発明に係る連続鋳造用モールドパウ
ダの作用を説明する。「上記銅合金」と大気が接触する
と、通常以下の反応が生じる。
ｍＸ（「上記銅合金」中）＋（ｎ／２）Ｏ2（大気中）＝ＸｍＯｎ・・・（１）
ここでＸは「上記銅合金」中の活性金属を表わし、ｍ、
ｎは化学量論性を示す。（１）式の反応は、「上記銅合
金」と大気とが直接接触することによって進行する。い
ま、活性遷移金属Ｙの原子価が＋２価である低級酸化物
ＹＯをモールドパウダ中に添加すると、大気中の酸素は
「上記銅合金」中の活性金属Ｘと反応する前にモールド
パウダ中のの活性遷移金属の低級酸化物ＹＯと酸化反応
し、活性遷移金属Ｙの原子価が高い、より高級な酸化物
を生成する。すなわち、
４ＹＯ（モールドパウダ中）＋Ｏ2（大気中）＝２Ｙ2Ｏ3↑・・・（２）
２ＹＯ（モールドパウダ中）＋Ｏ2（大気中）＝２ＹＯ2↑・・・（３）
モールドパウダは「上記銅合金」よりもはるかに比重が
小さいので、溶融した「上記銅合金」上に浮かんでい
る。したがって、モールドパウダ中の活性遷移金属Ｙの
低級酸化物は大気中の酸素によって酸化され、前記
（２）または（３）式の反応は容易に進行する。さら
に、前記（２）または（３）式の反応を鋳造中常に継続
させるためには、溶融した「上記銅合金」の表面にモー
ルドパウダを連続または断続的に供給すればよい。それ
によって前記（１）式の反応を常に抑制できることにな
る。
【００１１】また、「上記銅合金」に含まれる活性金属
Ｘとモールドパウダ中に添加する低級酸化物を構成する
活性遷移金属Ｙとを異種の元素とした場合、溶湯の凝固
過程においてモールドパウダの巻き込みが発生するとＹ
が不純物元素となり、インゴット品質が低下する恐れが
あることから、「上記銅合金」が含有する活性金属Ｘと
モールドパウダ中に添加する低級酸化物を構成する活性
遷移金属Ｙを同じ金属元素とすることが望ましい。ま
た、上記（２）および（３）式では、モールドパウダに
添加した低級な一酸化物が大気中の空気と反応すること
によって、より高級な三酸化物、二酸化物に酸化される
反応式を示したが、添加する酸化物を構成する活性遷移
金属Ｙの種類、反応雰囲気中の温度および酸素分圧によ
っては、さらに原子価の高い酸化物が生成されることが
ある。
【００１２】
【実施例】以下、本発明に係る実施例について説明す
る。本実施例においては、３トンの「上記銅合金」を不
活性雰囲気中で溶解し、通常の連続鋳造法によって鋳造
した。本実施例において「上記銅合金」中に含まれる活
性金属はチタンであり、その含有量は３重量％である
が、これは本発明の１実施例に過ぎず、チタンの含有量
は本発明の範囲を限定するものではない。また「上記銅
合金」中に含まれる活性金属として本実施例ではチタン
を取り上げて説明するが、これも本発明の範囲を限定す
るものではない。さらに本発明における活性金属とは、
酸素との化学的親和力が銅よりも大きい金属元素すべて
を指す。また本発明における活性遷移金属とは、酸素と
の化学的親和力が銅よりも大きい遷移金属元素すべてを
指す。さらにまた「上記銅合金」中に他の活性金属およ
びその他の金属が１種または２種以上含まれていても構
わない。
【００１３】本実施例の効果を証明するため次の実験を
行なった。「上記銅合金」の連続鋳造に当たって、まず
比較例として、弗化リチウムを主成分としたモールドパ
ウダを使用し、鋳造後インゴット中に含まれる酸化チタ
ン濃度を分析した。
【００１４】次に、本実施例として同じ系のモールドパ
ウダに１０重量％のＴｉＯ粉末を添加したモールドパウ
ダを使用して鋳造を行ない、同様に鋳造後のインゴット
に含まれる酸化チタン濃度を求めた。
【００１５】なお、本実施例ではモールドパウダに添加
する酸化物をＴｉＯとしたが、これは本発明の１実施例
を示すに過ぎず、添加したＴｉＯは本発明の範囲を限定
するものではない。モールドパウダに添加する酸化物
は、「上記銅合金」が含有する活性金属の種類によって
２種以上添加してもよい。さらに、使用したモールドパ
ウダは弗化リチウムを主成分としているが、これも本発
明の１実施例を示すに過ぎず、ナトリウム、カリウム等
の弗化物系、またはナトリウム、カリウム、リチウム、
カルシウム等の塩化物系のモールドパウダを使用しても
よい。
【００１６】本実験の結果としてインゴット中の酸化チ
タン濃度を比較例とともに図１に示した。図１から明ら
かなようにＴｉＯを添加しない比較例のモールドパウダ
ではインゴット中の酸化チタン濃度は０．３重量％に達
したが、ＴｉＯを添加した本実施例のモールドパウダで
は、インゴット中の酸化チタン濃度を０．０５重量％に
まで下げることができた。
【００１７】
【発明の効果】以上のように、本発明によれば「上記銅
合金」の連続鋳造に当たって、大気と「上記銅合金」と
の接触を実質的に遮断し、「上記銅合金」インゴット中
の活性金属の酸化物の濃度を低減することができ、その
結果、良好なインゴットを得ることができる。また、従
来のカーボン系モールドパウダを使用する際に発生して
いた作業環境の悪化等の問題も解消できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold powder used for continuous casting of a copper alloy containing an active metal. [0002] A copper alloy containing a metal having a higher chemical affinity for oxygen than copper (hereinafter referred to as an active metal), for example, titanium, chromium, zirconium, etc. (hereinafter referred to as the above-mentioned copper alloy) In the continuous casting of, in order to improve the yield of the active metal and the quality of the ingot, it is indispensable to prevent oxidation of the active metal in the “copper alloy”. It must be kept out of contact with the atmosphere. When melting the "copper alloy", the inside of the melting furnace is made to have an inert atmosphere by flowing a vacuum or an argon gas or the like, so that the contact between the "copper alloy" and the atmosphere can be cut off. In addition, the molten “copper alloy” can be cast in a mold in a vacuum or an inert atmosphere.However, casting in a vessel having a limited volume, such as a vacuum chamber, is limited to a so-called ingot forming method. In addition, this requires forging, peeling, and the like before hot rolling the obtained ingot, so that a good casting surface can be obtained from the viewpoint of yield and cost, and direct hot rolling can be performed. Casting with a possible continuous casting method is desirable. [0003] However, when the molten "copper alloy" is cast into a water-cooled through mold by a continuous casting method, the "copper alloy" at the top of the mold and the atmosphere are exposed. It is difficult to interrupt the contact of the copper alloy, and the active metal in the "copper alloy" is oxidized, and the generated oxide becomes so-called inclusions and becomes cloudy in the ingot, thereby deteriorating the quality of the product. This has been a major problem in the continuous casting of the “copper alloy”. Therefore, it is effective to coat the surface of the molten metal with mold powder in order to cut off the contact between the "copper alloy" and the atmosphere during continuous casting in the atmosphere. It is known from Japanese Patent Application No. 60-227957. In particular, carbon is added to mold powder, and oxygen in the atmosphere reacts with carbon in the mold powder. It is necessary not to react with the active metal therein. However, if carbon is added to the mold powder, the working environment is significantly deteriorated, and carbon powder becomes turbid in the secondary cooling water that jets out just below the mold to water-cool the ingot, causing clogging of the jet nozzle. In addition, there is a problem that it greatly hinders the disposal of the used mold powder. The present invention has been completed in view of the above circumstances, and cuts off the contact between the "copper alloy" and the atmosphere, deteriorating the working environment, clogging nozzles, and hindering the processing of mold powder after use. The purpose is to provide a mold powder that does not cause the problem. SUMMARY OF THE INVENTION The present inventor cuts off the contact between the "copper alloy" and the atmosphere and deteriorates the working environment, clogs the nozzles, and hinders the treatment of mold powder after use. With the aim of developing a mold powder that does not cause any difficulties, we conducted intensive research. As a result, the present inventors have large transition <br/> metals chemical affinity for oxygen than copper in mold powder, i.e. among the oxides of active transition metal, valence bivalent transition metal element It was found that if lower oxides were included, the oxygen in the atmosphere would react preferentially with the lower oxides of the active transition metals in the mold powder, and the active metals in the "copper alloy" were hardly oxidized. Invented the invention. The present invention is based on the above findings,
An active metal comprising 0.5 to 90% by weight of a lower oxide having a valence of a transition metal element of +2 among oxides of a transition metal having a greater chemical affinity for oxygen than copper. It is a continuous casting mold powder for a copper alloy containing. [0009] The lower oxide in the present invention is defined as m which shows the stoichiometry of the oxide YmOn added to the mold powder.
And an oxide in which the ratio of n and n / m takes the value 1. If the amount of the lower oxide added to the mold powder is less than 0.5% by weight, the reaction with the oxygen in the air proceeds rapidly, and the active metal in the “copper alloy” and the oxygen in the air are mixed with each other. The effect of suppressing the reaction cannot be expected. 90% by weight
If it exceeds, the lubricating effect between the solidified slab and the mold, in which other components of the mold powder dissolve and act, is significantly reduced,
In addition to not being able to obtain a good casting surface ingot, there is a risk of breakout occurring during continuous casting. Therefore, the amount of the lower oxide added to the mold powder is
The range of 0.5 to 90% by weight is good. The operation of the mold powder for continuous casting according to the present invention will be described below. When the above-mentioned copper alloy comes into contact with the atmosphere, the following reaction usually occurs. mX (in the above-mentioned copper alloy) + (n / 2) O2 (in the atmosphere) = XmOn (1) where X represents an active metal in the above-mentioned copper alloy, m,
n shows stoichiometry. The reaction of the formula (1) proceeds by the direct contact between the “copper alloy” and the atmosphere. Now, when a lower oxide YO in which the valence of the active transition metal Y is +2 is added to the mold powder, oxygen in the atmosphere causes oxygen in the mold powder to react with the active metal X in the “copper alloy”. and lower oxides YO of active transition metal oxidation, the valence of the active transition metal Y is high, to produce a more upscale oxides. That is, 4YO (in the mold powder) + O 2 (in the atmosphere) = 2Y 2 O 3 ↑ (2) 2YO (in the mold powder) + O 2 (in the atmosphere) = 2YO 2 ↑ (3) Mold powder Has a much lower specific gravity than the “copper alloy”, and thus floats on the molten “copper alloy”. Accordingly, the lower oxide of the active transition metal Y in the mold powder is oxidized by oxygen in the atmosphere, and the reaction of the above formula (2) or (3) proceeds easily. Further, in order to keep the reaction of the above formula (2) or (3) constantly during casting, the mold powder may be supplied continuously or intermittently to the surface of the molten “copper alloy”. Thereby, the reaction of the above formula (1) can always be suppressed. Further, when an active transition metal Y constituting the lower oxides to be added to the active metal X and a mold powder contained in "the copper alloy" as elements of different kinds, the mold powder in the solidification process of the melt When entanglement occurs, Y
May become an impurity element, and the quality of the ingot may be reduced. Therefore, the active metal X contained in the “copper alloy” and the activity constituting the lower oxide added to the mold powder may be used.
It is desirable that the transition metal Y be the same metal element. In the above formulas (2) and (3), the reaction formulas in which the lower monoxide added to the mold powder reacts with the air in the atmosphere to be oxidized to higher trioxides and dioxides are described. Although shown, depending on the type of the active transition metal Y constituting the oxide to be added, the temperature in the reaction atmosphere, and the oxygen partial pressure, an oxide having a higher valence may be generated. Embodiments of the present invention will be described below. In this example, 3 tons of the above-mentioned "copper alloy" was melted in an inert atmosphere and cast by a usual continuous casting method. In this embodiment, the active metal contained in the “copper alloy” is titanium, and the content thereof is 3% by weight. However, this is only one example of the present invention, and the content of titanium is not Is not limited. In the present embodiment, titanium will be described as an active metal contained in the “copper alloy”. However, this does not limit the scope of the present invention. Further, the active metal in the present invention,
Refers to all metal elements that have a greater chemical affinity for oxygen than copper. Further, the active transition metal in the present invention refers to oxygen and
All transition metal elements whose chemical affinity is greater than copper
Point. Further, one or more other active metals and other metals may be contained in the “copper alloy”. The following experiment was conducted to prove the effect of this embodiment. In the continuous casting of the “copper alloy”, first, as a comparative example, a mold powder containing lithium fluoride as a main component was used, and the concentration of titanium oxide contained in the ingot after the casting was analyzed. Next, in this embodiment, casting was performed using a mold powder of the same system to which 10% by weight of TiO powder was added, and similarly, the concentration of titanium oxide contained in the ingot after casting was determined. . In this embodiment, the oxide added to the mold powder is TiO. However, this is only one embodiment of the present invention, and the added TiO does not limit the scope of the present invention. . Two or more oxides may be added to the mold powder depending on the type of active metal contained in the “copper alloy”. Further, the mold powder used contains lithium fluoride as a main component, but this is also merely an example of the present invention, and a fluoride system such as sodium, potassium, etc., or sodium, potassium, lithium,
A mold powder of a chloride such as calcium may be used. FIG. 1 shows the titanium oxide concentration in the ingot as a result of this experiment together with a comparative example. As is apparent from FIG. 1, the concentration of titanium oxide in the ingot reached 0.3% by weight in the mold powder of the comparative example in which TiO was not added, but in the mold powder of the present example in which TiO was added, the oxidation in the ingot was The titanium concentration could be reduced to 0.05% by weight. As described above, according to the present invention, in continuous casting of the above-mentioned copper alloy, the contact between the atmosphere and the above-mentioned copper alloy is substantially cut off, The active metal oxide concentration in the ingot can be reduced, and as a result, a good ingot can be obtained. In addition, problems such as deterioration of the working environment that occur when using the conventional carbon mold powder can be solved.
【図面の簡単な説明】
【図１】本発明を実施して「上記銅合金」を連続鋳造し
たときのインゴット中の酸化チタン濃度を従来方法の比
較例と対比したグラフである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph comparing the concentration of titanium oxide in an ingot when a continuous casting of the “copper alloy” according to the present invention is performed with a comparative example of a conventional method.
フロントページの続き (56)参考文献 特開 昭48−93534（ＪＰ，Ａ) 特開 平１−312047（ＪＰ，Ａ) 特開 昭60−227957（ＪＰ，Ａ) 特開 昭52−77828（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/108 B22D 27/18 Continuation of the front page (56) References JP-A-48-93534 (JP, A) JP-A-1-312047 (JP, A) JP-A-60-227957 (JP, A) JP-A-52-77828 (JP, A) , A) (58) Field surveyed (Int. Cl. 7 , DB name) B22D 11/108 B22D 27/18
Claims (1)
る際に使用するモールドパウダ中に、酸素との化学的親
和力が銅よりも大きい遷移金属の酸化物のうち、遷移金
属元素の原子価が＋２価である低級酸化物を０．５〜９
０重量％含有させることを特徴とした銅合金用連続鋳造
モールドパウダ。(57) [Claim 1] In a mold powder used for continuous casting of a copper alloy containing an active metal, a transition metal oxide having a greater chemical affinity for oxygen than copper is contained in a mold powder. Among them, lower oxides having a valence of transition metal element of +2 are 0.5 to 9
A continuous casting mold powder for copper alloys, characterized by containing 0% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29818791A JP3375650B2 (en) | 1991-10-18 | 1991-10-18 | Continuous casting mold powder for copper alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29818791A JP3375650B2 (en) | 1991-10-18 | 1991-10-18 | Continuous casting mold powder for copper alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05309461A JPH05309461A (en) | 1993-11-22 |
| JP3375650B2 true JP3375650B2 (en) | 2003-02-10 |
Family
ID=17856346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29818791A Expired - Fee Related JP3375650B2 (en) | 1991-10-18 | 1991-10-18 | Continuous casting mold powder for copper alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3375650B2 (en) |
-
1991
- 1991-10-18 JP JP29818791A patent/JP3375650B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05309461A (en) | 1993-11-22 |
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