JP2002363664A - Foaming agent for producing foamed/porous metal - Google Patents
Foaming agent for producing foamed/porous metalInfo
- Publication number
- JP2002363664A JP2002363664A JP2001169968A JP2001169968A JP2002363664A JP 2002363664 A JP2002363664 A JP 2002363664A JP 2001169968 A JP2001169968 A JP 2001169968A JP 2001169968 A JP2001169968 A JP 2001169968A JP 2002363664 A JP2002363664 A JP 2002363664A
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- Japan
- Prior art keywords
- foaming agent
- powder
- porous metal
- foamed
- metal
- 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.)
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Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は発泡／多孔質金属の
製造に用いる発泡剤に関する。TECHNICAL FIELD The present invention relates to a foaming agent used for producing a foamed / porous metal.
【０００２】[0002]
【従来の技術】溶融金属若しくは粉末金属に発泡剤を添
加し、これらを加熱するなどして発泡剤をガス化し、金
属中に無数の孔を形成することで発泡金属若しくは多孔
質金属を得る技術は知られている。狭義には発泡金属は
無数の孔にガスを封じ込め、多孔質金属はガスを放出す
る点で差があるが、無数の孔を有する点では同一である
から、発泡／多孔質金属と一括して呼ぶことにする。2. Description of the Related Art A technique for obtaining a foamed metal or a porous metal by adding a foaming agent to a molten metal or a powdered metal and heating the gas to gasify the foaming agent and forming innumerable holes in the metal. Is known. In a narrow sense, foamed metal contains gas in a myriad of pores and porous metal has a difference in releasing gas, but it is the same in that it has a myriad of pores. I will call it.
【０００３】この発泡／多孔質金属の製造方法には、例
えば特許第２８９８４３７号公報「発泡可能な金属体の
製造方法」が提案され、同公報の段落番号［００２２］
第５行に「水素化チタン０．２重量％」や、同第１９行
に「炭酸水素ナトリウム」のごとく発泡剤の具体例が記
載されている。[0003] As a method for producing a foamed / porous metal, for example, Japanese Patent No. 2898437 proposes a "method for producing a foamable metal body", and the paragraph number [0022] of the publication is proposed.
The fifth line describes specific examples of the foaming agent, such as "0.2% by weight of titanium hydride" and the 19th line describes "sodium hydrogen carbonate".
【０００４】[0004]
【発明が解決しようとする課題】酸素との結びつきが強
いアルミニウムを発泡させるには、還元力の強い水素を
含む水素化チタンや炭酸水素ナトリウムの使用が一般的
である。In order to foam aluminum having a strong bond with oxygen, it is common to use titanium hydride or sodium hydrogen carbonate containing hydrogen having a strong reducing power.
【０００５】しかし、水素化チタンや炭酸水素ナトリウ
ムは高価であり、発泡／多孔質金属の製造コストを押上
げるという課題がある。また、発生する水素ガスは爆発
しやすい気体であり、取扱いに十分な注意を払わなけれ
ばならず、作業者の負担は大きくなる。そこで、本発明
の目的は廉価で水素爆発の危険が無い発泡剤を提供する
ことにある。[0005] However, titanium hydride and sodium hydrogen carbonate are expensive, and have a problem of raising the production cost of foamed / porous metal. In addition, the generated hydrogen gas is a gas that easily explodes, so that sufficient attention must be paid to its handling, and the burden on the operator increases. Therefore, an object of the present invention is to provide a foaming agent which is inexpensive and free from the danger of hydrogen explosion.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に請求項１は、発泡／多孔質金属を製造するときに用い
る発泡剤において、この発泡剤は、発泡性粉末と、この
粉末の表面を覆うフッ化物コーティング層とからなるこ
とを特徴とする。In order to achieve the above object, a first aspect of the present invention relates to a foaming agent used for producing a foamed / porous metal, wherein the foaming agent comprises an expandable powder and a surface of the powder. And a fluoride coating layer covering the surface.
【０００７】発泡／多孔質金属の製造過程で、フッ化物
はアルミニウムを覆う酸化膜を破壊する役割を果たす。
この結果、発泡剤は金属（アルミニウム）とのぬれ性が
高まり、溶融金属に良好に分散し、均一に孔が分布した
良質な発泡／多孔質金属を得ることができる。In the process of producing the foamed / porous metal, fluoride plays a role in destroying an oxide film covering aluminum.
As a result, the foaming agent increases the wettability with the metal (aluminum), and is excellently dispersed in the molten metal, so that a good-quality foamed / porous metal having uniformly distributed pores can be obtained.
【０００８】発泡剤は、発泡性粉末にフッ化物をコーテ
ィングしただけのものであるから、廉価であり、且つＨ
基を含まぬ発泡性粉末を用いた場合には、水素爆発の危
険も無い。The foaming agent is inexpensive because it is obtained by simply coating a foamable powder with a fluoride.
There is no danger of hydrogen explosion when using effervescent powder containing no groups.
【０００９】[0009]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。まず、本発明に係る発泡剤製造
方法である共沈法を説明する。図１（ａ）〜（ｅ）は本
発明に係る発泡剤の共沈法工程図である。（ａ）におい
て、容器１０に入れたＮａＦ水溶液１１を加熱手段１２
で約４０℃まで加熱する。Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a coprecipitation method, which is a method for producing a blowing agent according to the present invention, will be described. 1 (a) to 1 (e) are co-precipitation process charts of a blowing agent according to the present invention. In (a), the NaF aqueous solution 11 put in the container 10 is heated by the heating means 12.
And heat to about 40 ° C.
【００１０】（ｂ）において、ＮａＦ水溶液１１に発泡
性粉末１３を入れる。この発泡性粉末１３は、炭酸カル
シウム（ＣａＣＯ3）や炭酸マグネシウム（ＭｇＣＯ3）
などの炭酸塩が適当である。爆発の危険が無い炭酸ガス
（二酸化炭素ガス）を発生するからである。[0010] In (b), an effervescent powder 13 is put into an aqueous NaF solution 11. This expandable powder 13 is made of calcium carbonate (CaCO 3 ) or magnesium carbonate (MgCO 3 ).
A carbonate such as is suitable. This is because it generates carbon dioxide gas (carbon dioxide gas) that does not have a risk of explosion.
【００１１】なお、前記炭酸マグネシウム（ＭｇＣ
Ｏ3）は、入手が容易で、安定性に富む塩基性炭酸マグ
ネシウム（４ＭｇＣＯ3・Ｍｇ（ＯＨ2）・５Ｈ2Ｏ））
を脱水処理等を施すことにより生成することができる。The magnesium carbonate (MgC)
O 3) is readily available, basic magnesium carbonate rich in stability (4MgCO 3 · Mg (OH 2 ) · 5H 2 O))
Can be produced by performing a dehydration treatment or the like.
【００１２】（ｃ）において、撹拌手段１４にてＮａＦ
水溶液１１と発泡性粉末１３とを十分に撹拌する。この
撹拌により次に示す反応が起こる。なお、撹拌は４０分
〜６０分程度続ける。その理由は後述する。In (c), the stirring means 14
The aqueous solution 11 and the foamable powder 13 are sufficiently stirred. This stirring causes the following reaction. The stirring is continued for about 40 to 60 minutes. The reason will be described later.
【００１３】[0013]
【化１】 Embedded image
【００１４】（液）は液体（水溶液）を示し、（固）は
固体（粉末又は膜）を示す。ＮａＦ水溶液にＣａＣＯ3
の粉末を接触させると、ＣａにＦが結合してＣａＦ2が
できるが、残りがＮａ2ＣＯ3（液体）となってＮａＦ水
溶液に混じる。すなわち、ＣａＣＯ3粉末の表面のＣａ
ＣＯ3がＮａＦに接触して、ＣＯ3がＦに置き換り、フッ
化物であるＣａＦ2の形でＣａＣＯ3粉末を覆う。(Liquid) indicates a liquid (aqueous solution), and (solid) indicates a solid (powder or film). CaCO in NaF solution 3
When F powder is brought into contact with Ca, F binds to Ca to form CaF 2 , but the remainder becomes Na 2 CO 3 (liquid) and is mixed with the NaF aqueous solution. That is, Ca on the surface of CaCO 3 powder
And CO 3 is in contact with NaF, CO 3 is placed on F換Ri, covering the CaCO 3 powder in the form of CaF 2 is fluoride.
【００１５】[0015]
【化２】 Embedded image
【００１６】ＮａＦ水溶液にＭｇＣＯ3の粉末を接触さ
せると、ＭｇＣＯ3粉末の表面のＭｇＣＯ3がＮａＦに接
触して、ＣＯ3がＦに置き換り、フッ化物であるＭｇＦ2
の形でＭｇＣＯ3粉末を覆う。When MgCO 3 powder is brought into contact with an aqueous solution of NaF, MgCO 3 on the surface of the MgCO 3 powder comes into contact with NaF, so that CO 3 is replaced by F and MgF 2 which is a fluoride
Cover the MgCO 3 powder in the form of
【００１７】（ｄ）において、濾紙等の濾材１５にて混
合液を濾過する。このときに吸引することで濾過作業を
促す。（ｅ）において、乾燥させることにより、所望の
発泡剤２０を得る。In (d), the mixture is filtered with a filter medium 15 such as filter paper. At this time, suction is performed to facilitate the filtering operation. In (e), the desired foaming agent 20 is obtained by drying.
【００１８】図２は本発明に係る発泡剤の模型図であ
り、発泡剤２０は、ＣａＣＯ3粉末又はＭｇＣＯ3粉末か
らなる発泡性粉末１３と、この発泡性粉末１３の表面を
覆うフッ化物コーティング層２１とからなる。フッ化物
コーティング層２１は例えばＣａＦ2又はＭｇＦ2からな
る。[0018] Figure 2 is a model view of a blowing agent according to the present invention, the blowing agent 20, a foamable powder 13 consisting of CaCO 3 powder or MgCO 3 powder, the fluoride coating covering the surface of the foamable powder 13 And a layer 21. The fluoride coating layer 21 is made of, for example, CaF 2 or MgF 2 .
【００１９】以上の述べた構造の発泡剤２０を用いた発
泡／多孔質金属の製造方法を次に説明する。図３（ａ）
〜（ｅ）は本発明の発泡剤を用いた発泡／多孔質金属の
製造工程図である。（ａ）において、ルツボ３１に７％
珪素を含むＳｉ系アルミニウム合金３２を入れ、ヒータ
３３で約７００℃に加熱して、金属を溶解する。なお、
真空溶解するときには真空炉内でこの処理及び以降の処
理を実施するが、ここでは真空炉は省略する。A method for producing a foamed / porous metal using the foaming agent 20 having the above-described structure will be described below. FIG. 3 (a)
(E) is a production process diagram of a foamed / porous metal using the foaming agent of the present invention. (A) In crucible 31, 7%
The Si-based aluminum alloy 32 containing silicon is put in, and heated to about 700 ° C. by the heater 33 to dissolve the metal. In addition,
When performing vacuum melting, this processing and the subsequent processing are performed in a vacuum furnace, but the vacuum furnace is omitted here.
【００２０】（ｂ）において、撹拌手段３４で溶湯３５
を攪拌しつつ、溶湯３５にＣａやＭｇの粘度調整剤３６
を投入して粘度を調整する。（ｃ）において、溶湯３５
にさらに発泡剤２０を適量投入する。In FIG. 2B, the molten metal 35 is stirred by the stirring means 34.
While stirring, a viscosity modifier 36 of Ca or Mg
To adjust the viscosity. In (c), the molten metal 35
Further, an appropriate amount of the foaming agent 20 is added.
【００２１】（ｄ）は発泡剤２０がガス化したために溶
湯３５が増量したことを示す。このままで、冷却を開始
する。（ｅ）において、適当な温度でルツボから外し、
さらに冷却すれば、発泡／多孔質金属３７を得る。FIG. 3D shows that the amount of the molten metal 35 has increased due to the gasification of the foaming agent 20. In this state, cooling is started. In (e), remove from the crucible at an appropriate temperature,
Upon further cooling, a foamed / porous metal 37 is obtained.
【００２２】図４は発泡／多孔質金属の密度と処理時間
との関係を調べたグラフであり、横軸の処理時間は図１
（ｂ）〜（ｄ）までの時間、すなわち、発泡性粉末がＮ
ａＦ水溶液に接触している時間である。比較例１は従来
の代表的な発泡剤であるＣａＣＯ3でＳｉ系アルミニウ
ム合金を発泡させた例を示し、得られた発泡／多孔質金
属の密度は、１．８Ｍｇ／ｍ3であった。FIG. 4 is a graph showing the relationship between the density of the foamed / porous metal and the processing time.
(B) to (d), that is, the expandable powder is N
This is the time of contact with the aF aqueous solution. Comparative Example 1 shows an example in which a Si-based aluminum alloy was foamed with CaCO 3 which is a conventional typical foaming agent, and the density of the foamed / porous metal obtained was 1.8 Mg / m 3 .
【００２３】比較例２は従来の好ましい発泡剤であるＴ
ｉＨ2でＳｉ系アルミニウム合金を発泡させた例を示
し、得られた発泡／多孔質金属の密度は、１．１Ｍｇ／
ｍ3であった。グラフの右に白抜き矢印で示した通り
に、密度が小さいほど発泡性は大きく、比較例２は比較
例１より遥に発泡性が大きいことが分かる。Comparative Example 2 is a conventional preferred blowing agent, T
An example of foamed Si-based aluminum alloy iH 2, the density of the resulting foam / porous metal, 1.1 mg /
m 3 . As shown by the white arrow on the right side of the graph, it can be seen that the foamability increases as the density decreases, and that the foamability of Comparative Example 2 is much higher than that of Comparative Example 1.
【００２４】これは比較例２で用いた発泡剤（Ｔｉ
Ｈ2）に含まれるＨがアルミニウム表面の酸化膜を破壊
し、アルミニウムと発泡剤とを円滑に接触させる。この
結果、発泡剤が溶融金属中に良好に分散し、均一に孔を
形成することができたことを意味する。This is the same as the blowing agent (Ti
H contained in H 2 ) destroys an oxide film on the surface of aluminum and makes aluminum and the foaming agent come into smooth contact. As a result, the foaming agent was well dispersed in the molten metal, and the pores could be formed uniformly.
【００２５】逆に、比較例１は安価で安全なＣａＣＯ3
を発泡剤に採用したが、アルミニウムの表面が酸化膜で
覆われ、アルミニウムと発泡剤とを十分に接触せず、こ
の結果、発泡剤が溶融金属中に不十分に分散し、孔の形
成が偏り、十分な数の孔を形成することができなかった
ことを意味する。On the contrary, Comparative Example 1 is a cheap and safe CaCO 3
Was used as the foaming agent, but the surface of the aluminum was covered with an oxide film, and the aluminum and the foaming agent did not come into sufficient contact. As a result, the foaming agent was insufficiently dispersed in the molten metal, and the formation of pores occurred. This means that a sufficient number of holes could not be formed.
【００２６】一方、本発明による実施例では横軸の処理
時間に、得られる発泡性が大きく依存することが分かっ
た。すなわち、処理時間が１０分以内では比較例１と同
じであった。しかし、処理時間を４０分以上に延ばすと
比較例２並みの発泡性が得られる。そこで、処理時間は
４０〜６０分程度とする。On the other hand, in the examples according to the present invention, it was found that the foaming property obtained largely depends on the processing time on the horizontal axis. That is, the processing time was the same as Comparative Example 1 within 10 minutes. However, if the processing time is extended to 40 minutes or more, foaming properties comparable to Comparative Example 2 can be obtained. Therefore, the processing time is set to about 40 to 60 minutes.
【００２７】処理時間を延ばせば、図２に示すフッ化物
コーティング層２１が十分に成長して、その膜厚が増加
する。膜厚が増加すれば、発泡剤の保有するフッ化物の
量が比例的に増加し、このフッ化物がアルミニウム合金
表面の酸化膜を盛んに破壊するため、比較例２並みの良
好な結果が得られたと言える。ここで、重要なことは、
本発明の発泡剤はＣａＣＯ3粉末又はＭｇＣＯ3粉末から
なる発泡性粉末と、この発泡性粉末の表面を覆うフッ化
物コーティング層とからなり、廉価であり、水素爆発の
危険性がないことである。If the processing time is extended, the fluoride coating layer 21 shown in FIG. 2 grows sufficiently and the film thickness increases. As the film thickness increases, the amount of fluoride held by the foaming agent increases proportionally, and the fluoride vigorously destroys the oxide film on the surface of the aluminum alloy. It can be said that it was done. The important thing here is that
The foaming agent of the present invention comprises a foamable powder composed of CaCO 3 powder or MgCO 3 powder and a fluoride coating layer covering the surface of the foamable powder, and is inexpensive and has no danger of hydrogen explosion. .
【００２８】図１に述べた共沈法の他、次に説明する蒸
発法でも本発明の発泡剤を製造することができる。図５
（ａ）〜（ｃ）は本発明に係る発泡剤の蒸発法工程図で
ある。（ａ）において、容器１０に入れたＮａＦ水溶液
１１へ発泡性粉末１３を入れる。（ｂ）において、加熱
手段１２で加熱しつつ、ＮａＦ水溶液１１と発泡性粉末
１３とを攪拌する。この撹拌により次の反応が起こる。In addition to the coprecipitation method shown in FIG. 1, the foaming agent of the present invention can be produced by an evaporation method described below. FIG.
(A)-(c) is a process diagram of the foaming agent evaporation method according to the present invention. In (a), an effervescent powder 13 is put into a NaF aqueous solution 11 put in a container 10. In (b), the NaF aqueous solution 11 and the foamable powder 13 are stirred while being heated by the heating means 12. The following reaction occurs by this stirring.
【００２９】[0029]
【化３】 Embedded image
【００３０】[0030]
【化４】 Embedded image
【００３１】反応の詳細は、先に説明したので省略す
る。（ｃ）において、容器１０を加熱手段１２で引続き
加熱することで水分を蒸発させ、結果として発泡剤２０
を得る。この発泡剤２０の断面構造は図２で説明した通
りである。The details of the reaction have been described above and will not be described. In (c), the container 10 is continuously heated by the heating means 12 to evaporate water, and as a result, the foaming agent 20
Get. The cross-sectional structure of the foaming agent 20 is as described in FIG.
【００３２】尚、発泡／多孔質金属はアルミニウム合金
を原則とするが、金属（含む合金）であれば種類は問わ
ず、例えばマグネシウム合金、鉄系合金、ステンレス鋼
などが挙げられる。The foamed / porous metal is basically made of an aluminum alloy. However, any metal (including alloy) may be used, for example, a magnesium alloy, an iron-based alloy, and stainless steel.
【００３３】また、発泡性粉末は炭酸塩が好適である
が、通常の発泡剤に用いられている材料であれば適宜使
用することができる。フッ化物はＦ基を含む化合物あ
り、その種類は問わない。The foaming powder is preferably a carbonate, but any material used in a general foaming agent can be used as appropriate. Fluoride is a compound containing an F group, and its type is not limited.
【００３４】[0034]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１の発泡剤は、発泡性粉末と、この粉末の
表面を覆うフッ化物コーティング層とからなる。フッ化
物コーティング層は発泡／多孔質金属の製造過程で、フ
ッ化物はアルミニウムなどの金属を覆う酸化膜を破壊す
る役割を果たす。この結果、発泡剤は溶融金属とのぬれ
性が高まり、溶融金属に良好に分散し、均一に孔が分布
した良質な発泡／多孔質金属を得ることができる。According to the present invention, the following effects are exhibited by the above configuration. The foaming agent of claim 1 comprises a foamable powder and a fluoride coating layer covering the surface of the powder. The fluoride coating layer plays a role in destroying an oxide film covering a metal such as aluminum in the process of producing a foamed / porous metal. As a result, the foaming agent has improved wettability with the molten metal, and can be dispersed well in the molten metal to obtain a high-quality foamed / porous metal having uniformly distributed pores.
【００３５】加えて、発泡剤は、発泡性粉末にフッ化物
をコーティングしただけのものであるから、廉価であ
り、且つＨ基を含まぬ発泡性粉末を用いた場合には、水
素爆発の危険も無い。In addition, since the foaming agent is obtained by simply coating the foamable powder with a fluoride, the foaming agent is inexpensive and, if the foamable powder containing no H group is used, there is a danger of hydrogen explosion. Not even.
【図１】本発明に係る発泡剤の共沈法工程図FIG. 1 is a process diagram of a co-precipitation method of a blowing agent according to the present invention.
【図２】本発明に係る発泡剤の模型図FIG. 2 is a schematic view of a foaming agent according to the present invention.
【図３】本発明の発泡剤を用いた発泡／多孔質金属の製
造工程図FIG. 3 is a production process diagram of a foamed / porous metal using the foaming agent of the present invention.
【図４】発泡／多孔質金属の密度と処理時間との関係を
調べたグラフFIG. 4 is a graph showing the relationship between the density of foamed / porous metal and the processing time.
【図５】本発明に係る発泡剤の蒸発法工程図FIG. 5 is a process diagram of a blowing agent evaporation method according to the present invention.
１３…発泡性粉末、２０…発泡剤、２１…フッ化物コー
ティング層、３７…発泡／多孔質金属。13: foamable powder, 20: foaming agent, 21: fluoride coating layer, 37: foamed / porous metal.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4G076 AA05 AA16 AB09 BA24 BF05 CA02 DA30 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G076 AA05 AA16 AB09 BA24 BF05 CA02 DA30
Claims (1)
る発泡剤において、この発泡剤は、発泡性粉末と、この
粉末の表面を覆うフッ化物コーティング層とからなるこ
とを特徴とする発泡／多孔質金属製造用発泡剤。1. A foaming agent used for producing a foamed / porous metal, wherein the foaming agent comprises a foamable powder and a fluoride coating layer covering the surface of the powder. Foaming agent for porous metal production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001169968A JP3771463B2 (en) | 2001-06-05 | 2001-06-05 | Foaming agent for foaming / porous metal production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001169968A JP3771463B2 (en) | 2001-06-05 | 2001-06-05 | Foaming agent for foaming / porous metal production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002363664A true JP2002363664A (en) | 2002-12-18 |
| JP3771463B2 JP3771463B2 (en) | 2006-04-26 |
Family
ID=19011968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001169968A Expired - Fee Related JP3771463B2 (en) | 2001-06-05 | 2001-06-05 | Foaming agent for foaming / porous metal production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3771463B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439526C (en) * | 2007-07-09 | 2008-12-03 | 东南大学 | Foamed aluminium and aluminum alloy tackifying foaming preparation method |
-
2001
- 2001-06-05 JP JP2001169968A patent/JP3771463B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439526C (en) * | 2007-07-09 | 2008-12-03 | 东南大学 | Foamed aluminium and aluminum alloy tackifying foaming preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3771463B2 (en) | 2006-04-26 |
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