JP4144071B2 - Alumina powder for filling metal composite material and method for producing the same - Google Patents
Alumina powder for filling metal composite material and method for producing the same Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、金属複合材料充填用アルミナ粉末及びその製造方法に関する。詳細には、粗粒篩別工程を有する金属複合材料充填用アルミナ粉末の製造方法に於いて、粗粒篩別工程の処理速度を高めることが可能な金属複合材料充填用アルミナ粉末及びその製造方法に関する。
【０００２】
【従来の技術】
アルミナ粉末を金属複合材料等の充填材として用いることは公知である。従来より、金属複合材料の機械的強度に対して、粗粒が悪影響を及ぼすことは知られており、充填材であるアルミナ粉末についても粗粒の低減が要求されてきた。通常、アルミナ粉末の粗粒の低減は、篩別により行われる。しかしながら、アルミナ粉末は篩別時に目詰まりが発生しやすく、十分な篩別処理速度を得ることができなかった。
【０００３】
【発明が解決しようとする課題】
かかる事情下に鑑み，本発明者等は、粗粒篩別工程を有する金属複合材料充填用アルミナ粉末の製造方法において、篩別処理工程に於ける篩別処理速度の向上について鋭意検討した結果、アルミナ粉末に対して特定の平均粒子径、嵩密度、差角を有する微粒無機粉末を特定量存在せしめる場合には、十分な篩別処理速度を有する金属複合材料充填用アルミナ粉末が得られることを見出し、本発明を完成するに至った．
【０００４】
【課題を解決するための手段】
すなわち、本発明の第１は、アルミナ粉末１００重量部に対して、平均粒子径が１μｍ未満、嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3、差角が１５°〜３０°である微粒無機粉末を少なくとも０．０１重量部含有してなる金属複合材料充填用アルミナ粉末を提供するにある。
【０００５】
本発明の第２は、粗粒篩別工程を有する金属複合材料充填用アルミナ粉末の製造方法において、アルミナ粉末１００重量部に対して、平均粒子径が１μｍ未満、嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3、差角が１５°〜３０°である微粒無機粉末を少なくとも０．０１重量部添加混合した後、篩別することを特徴とする金属複合材料充填用アルミナ粉末の製造方法を提供するにある。
【０００６】
【発明の実施の形態】
以下、本発明を詳細に説明する。
本発明のアルミナ粉末は、特に制限されるものではなく、従来公知のアルミナ粉末であれば良い。特に、バイヤー法により得られるアルミナ粉末は、安価であると共に各種粒子径のものが入手可能であることからその適用が推奨される。結晶形としてはαアルミナ単独であることが好ましいが、γアルミナ、κアルミナ、δアルミナ、θアルミナ、ηアルミナ、χアルミナ、ρアルミナ等が共存していても良い。また、アルミナ粉末の平均粒子径が小さくなると、金属への均一充填が困難になることから、通常、アルミナ粉末の平均粒子径は約１μｍ〜約１０μｍである。アルミナ粉末の高温揮発成分は成形時の欠陥等の発生原因となるため、アルミナ粉末の水分は０．１％以下であり、Ｎａ2Ｏは０．４％以下であることが好ましい。
【０００７】
本発明の微粒無機粉末は、平均粒子径が１μｍ未満、好ましくは０．００１μｍ〜０．５μｍ、嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3、差角が１５°〜３０°、好ましくは１８°〜２８°であることを特徴とする。微粒無機粉末の平均粒子径が１μｍ以上の場合、十分な篩別処理速度が得られない。平均粒子径の下限は特にないが、小さくなると混合時等に飛散しやすくなり、ハンドリング性が低下する。微粒無機粉末の嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3の範囲を外れる場合、その理由は詳らかではないが、十分な篩別処理速度を得ることができない。また、微粒無機粉末の差角が１５°〜３０°の範囲を外れる場合にも、十分な篩別処理速度を得ることができない。
【０００８】
該微粒無機粉末は、前述の平均粒子径、嵩密度、差角を満足するものであれば特に限定されないが、通常、酸化珪素、アルミナ、酸化チタン、酸化ジルコニウムからなる群より選ばれた少なくとも１種であり、好ましくは酸化珪素またはアルミナである。
【０００９】
該微粒無機粉末の含有量は、アルミナ粉末１００重量部に対して少なくとも０．０１重量部、好ましくは０．０１重量〜１重量部である。含有量が０．０１重量部より少ない場合、微粒無機粉末の添加による篩別処理速度の改良効果が十分でない。一方、微粒無機粉末の含有量の上限は特にないが、通常、微粒無機粉末はＢＥＴ比表面積が高いので、含有量が多くなるにつれて、アルミナ粉末のＢＥＴ比表面積が高くなり、吸湿しやすくなる。
【００１０】
本発明の金属複合材料充填用アルミナ粉末において、アルミナ粉末に対して微粒無機粉末を含有せしめる方法としては、例えば、水平円筒型混合機、Ｖ型混合機、二重円錐型混合機、リボン型混合機、スクリュー型混合機、高速流動型混合機、回転円板型混合機、気流攪拌型混合機、重力落下混合機等の混合機を用いる方法がある。
【００１１】
本発明の金属複合材料充填用アルミナ粉末は、十分な篩別処理速度を有するものであり、その粉体物性は一義的ではないが、通常、平均粒子径が１μｍ〜１０μｍ、好ましくは２μｍ〜５μｍであり、ＢＥＴ比表面積が０．２ｍ2／ｇ〜１０ｍ2／ｇ、好ましくは０．５ｍ2／ｇ〜５ｍ2／ｇであり、嵩密度が１．０ｇ／ｃｍ3〜１．５ｇ／ｃｍ3であり、差角が５°以上、好ましくは１０°〜２５°である。
【００１２】
本発明の第２の金属複合材料充填用アルミナ粉末の製造方法は、アルミナ粉末１００重量部に対して、平均粒子径が１μｍ未満、嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3、差角が１５°〜３０°である微粒無機粉末を少なくとも０．０１重量部添加混合した後、篩別することを特徴とする。
【００１３】
本発明のアルミナ粉末は、特に制限されるものではなく、従来公知のアルミナ粉末であれば良い。特に、バイヤー法により得られるアルミナ粉末は、安価であると共に各種粒子径のものが入手可能であることからその適用が推奨される。結晶形としてはαアルミナ単独であることが好ましいが、γアルミナ、κアルミナ、δアルミナ、θアルミナ、ηアルミナ、χアルミナ、ρアルミナ等が共存していても良い。また、アルミナ粉末の平均粒子径が小さくなると、金属への均一充填が困難になることから、通常、アルミナ粉末の平均粒子径は約１μｍ〜約１０μｍである。アルミナ粉末の高温揮発成分は成形時の欠陥等の発生原因となり、得られる金属複合材料充填用アルミナ粉末の機械的強度を低下させるため、アルミナ粉末の水分は０．１％以下であり、Ｎａ2Ｏは０．４％以下であることが好ましい。
【００１４】
本発明の微粒無機粉末は、平均粒子径が１μｍ未満、好ましくは０．００１μｍ〜０．５μｍ、嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3、差角が１５°〜３０°、好ましくは１８°〜２８°であることを特徴とする微粒無機粉末である。微粒無機粉末の平均粒子径が１μｍ以上の場合、金属複合材料充填用アルミナ粉末の製造に際して十分な篩別処理速度が得られない。平均粒子径の下限は特にないが、小さくなると混合時等に飛散しやすくなり、ハンドリング性が低下する。微粒無機粉末の嵩密度が０．０１ｇ／ｃｍ3〜１．０ｇ／ｃｍ3の範囲を外れる場合、その理由は詳らかではないが、金属複合材料充填用アルミナ粉末の製造に際して十分な篩別処理速度を得ることができない。また、微粒無機粉末の差角が１５°〜３０°の範囲を外れる場合にも、金属複合材料充填用アルミナ粉末の製造に際して十分な篩別処理速度を得ることができない。
【００１５】
該微粒無機粉末の添加量は、通常、アルミナ粉末１００重量部に対して、少なくとも０．０１重量部、好ましくは０．０１重量〜１重量部である。添加量が０．０１重量部より少ない場合、微粒無機粉末の添加による篩別処理速度の改良効果が十分でない。一方、微粒無機粉末の添加量に上限は特にないが、通常、微粒無機粉末はＢＥＴ比表面積が高いので、添加量が多くなるにつれて、金属複合材料充填用アルミナ粉末のＢＥＴ比表面積が高くなり、吸湿しやすくなることから、金属複合材料充填用アルミナ粉末を充填し得られた金属複合材料の機械的強度が低下する場合がある。
【００１６】
本発明のアルミナ粉末と微粒無機粉末との混合は、従来公知の方法であれば良く特に限定はない。例えば、水平円筒型混合機、Ｖ型混合機、二重円錐型混合機、リボン型混合機、スクリュー型混合機、高速流動型混合機、回転円板型混合機、気流攪拌型混合機、重力落下混合機等が適用可能である。混合に際しては、アルミナ粉末と微粒無機粉末を混合機を用いて添加混合すればよい。
【００１７】
本発明の篩別は、網面固定式篩分け機、網面運動式篩分け機等の従来公知の篩別機が適用できる。
【００１８】
本発明の金属複合材料充填用アルミナ粉末の製造に際しては、アルミナ粉末と微粒無機粉末を混合機に添加混合した後、篩別機により篩別する方法で行うが、、添加混合を篩別機にアルミナ粉末と微粒無機粉末を併注する方法で行ってもよい。また、必要に応じて、篩別を２段以上に分けて行ってもよいし、さらに分級操作を組み合わせて行ってもよい。
【００１９】
本発明の第２の金属複合材料充填用アルミナ粉末の製造方法により得られる金属複合材料充填用アルミナ粉末は、十分な篩別処理速度を有し、かつ粗粒を低減した金属複合材料充填用アルミナ粉末であり、通常、平均粒子径が１μｍ〜１０μｍ、好ましくは２μｍ〜５μｍであり、ＢＥＴ比表面積が０．２ｍ2／ｇ〜１０ｍ2／ｇ、好ましくは０．５ｍ2／ｇ〜５ｍ2／ｇであり、嵩密度が１．０ｇ／ｃｍ3〜１．５ｇ／ｃｍ3であり、差角が５°以上、好ましくは１０°〜２５°である。
【００２０】
【発明の効果】
以上詳述した如く、本発明の金属複合材料充填用アルミナ粉末は、粗粒篩別工程に於いて高い篩別処理速度を有するものであり、かかる金属複合材料充填用アルミナ粉末を篩別することにより、粗粒を低減した金属複合材料充填用アルミナ粉末を効率良く供給できることから、その産業上の利用価値は大なるものである。
【００２１】
【実施例】
以下に実施例により本発明をさらに詳細に説明するが、本発明はかかる実施例により制限を受けるものではない。尚、本発明において、平均粒子径、ＢＥＴ比表面積、水分、嵩密度、差角、Ｎａ2Ｏ、篩別速度は以下の方法で行った。
【００２２】
平均粒子径Ｄ50（μｍ）：レーザー散乱式粒度分布計〔リード アンド ノースラップ（ＬＥＥＤ＆ＮＯＲＴＨＲＵＰ）社製マイクロトラックＨＲＡ）により測定した。
ＢＥＴ比表面積（ｍ2/ｇ）：窒素吸着法により測定した。
水分（％） ：１１０℃、２４ｈｒ加熱時の重量減少より求めた。
嵩密度（ｇ／ｃｍ3） ：２００ｍｌメスシリンダー中に粉末を流し込んだ後、１００回タッピングして得らた粉末の嵩密度を測定する。
差角（°） ：パウダーテスターＰＴ−Ｅ型（ホソカワミクロン株式会社製）を使って測定した安息角と崩潰角の差より求めた。
Ｎａ2Ｏ（％） ：ＪＩＳ Ｈ１９０１に従う。
篩別速度（ｋｇ／ｈｒ・ｍ2）：試料を供給装置により、振動型篩別機５０２型〔株式会社ダルトン製、ウエイトの位相角６０°、篩い（ＪＩＳ Ｚ８８０１旧規格 目開き３５０メッシュ４４μｍ、有効網径４５０ｍｍφ）〕へ定量供給し、篩を通過する試料の重量より篩別速度を求めた。尚、試料の供給は、篩上の粉末により作られる円形が有効網径の１／２（２２０ｍｍφ〜２３０ｍｍφ）となる最大供給量で行った。
【００２３】
実施例１、２
バイヤー法により得られたアルミナＡ（中心粒子径２．９μｍ、ＢＥＴ比表面積１．３ｍ2／ｇ、嵩密度１．２７ｇ／ｃｍ3、安息角４８°、差角３°、Ｎａ2Ｏ ０．０４％、水分０．０６％）と、気相法により得られたアルミナＢ（中心粒子径０．１μｍ未満、ＢＥＴ比表面積１００ｍ2／ｇ、嵩密度０．０５ｇ／ｃｍ3、差角２１°）を表１の条件にて添加混合し、得られた混合粉末の物性及び篩別速度を求めた。結果を表１に示す。尚、得られた混合粉末は、粗粒が低減されていた。
【００２４】
実施例３
バイヤー法により得られたアルミナＡと、気相法により得られたシリカＡ（中心粒子径０．１μｍ未満、ＢＥＴ比表面積１１０ｍ2／ｇ、嵩密度０．０５ｇ／ｃｍ3、差角２１°）を表１に示す条件にて添加混合し、得られた混合粉末の物性及び篩別速度を求めた。結果を表１に示す。
【００２５】
実施例４、５
バイヤー法により得られたアルミナＡと、アルコキシド法により得られたアルミナＣ（中心粒子径０．１μｍ未満、ＢＥＴ比表面積１４０ｍ2／ｇ、嵩密度０．１０ｇ／ｃｍ3、差角２３°）を表１に示す条件にて添加混合し、得られた混合粉末の物性及び篩別速度を求めた。結果を表１に示す。
【００２６】
比較例１
アルミナＡの篩別速度を求めた。結果を表１に示す。
【００２７】
比較例２
アルミナＢの篩別速度を求めた。結果を表１に示す。
【００２８】
比較例３
アルミナＣの篩別速度を求めた。結果を表１に示す。
【００２９】
比較例４
シリカＡの篩別速度を求めた。結果を表１に示す。
【００３０】
【表１】
BACKGROUND OF THE INVENTION
The present invention relates to an alumina powder for filling a metal composite material and a method for producing the same. In detail, in the manufacturing method of the alumina powder for metal composite material filling which has a coarse sieving process, the alumina powder for metal composite material filling which can raise the processing speed of a coarse sieving process, and its manufacturing method About.
[0002]
[Prior art]
The use of alumina powder as a filler such as a metal composite material is known. Conventionally, it has been known that coarse particles have an adverse effect on the mechanical strength of a metal composite material, and alumina powder as a filler has been required to be reduced. Usually, the coarse particles of alumina powder are reduced by sieving. However, the alumina powder is likely to be clogged during sieving, and a sufficient sieving speed could not be obtained.
[0003]
[Problems to be solved by the invention]
In view of such circumstances, the present inventors, as a result of earnestly examining the improvement of the sieving treatment speed in the sieving treatment step, in the method for producing an alumina powder for filling a metal composite material having a coarse sieving step, When a specific amount of fine inorganic powder having a specific average particle diameter, bulk density, and difference angle is present with respect to the alumina powder, an alumina powder for filling a metal composite material having a sufficient sieving speed can be obtained. The headline and the present invention were completed.
[0004]
[Means for Solving the Problems]
That is, according to the first aspect of the present invention, the average particle diameter is less than 1 μm, the bulk density is 0.01 g / cm 3 to 1.0 g / cm 3 , and the difference angle is 15 ° to 30 ° with respect to 100 parts by weight of the alumina powder. It is another object of the present invention to provide an alumina powder for filling a metal composite material containing at least 0.01 part by weight of a fine inorganic powder.
[0005]
A second aspect of the present invention is a method for producing an alumina powder for filling a metal composite material having a coarse sieving step, wherein the average particle diameter is less than 1 μm and the bulk density is 0.01 g / cm with respect to 100 parts by weight of the alumina powder. 3 ~1.0g / cm 3, after the difference angle is mixed for at least 0.01 part by weight added fine inorganic powder is 15 ° to 30 °, the metal composite filling alumina powder characterized by sieved To provide a manufacturing method.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The alumina powder of the present invention is not particularly limited and may be any conventionally known alumina powder. In particular, the alumina powder obtained by the Bayer method is recommended because of its low cost and availability of various particle sizes. The crystal form is preferably α-alumina alone, but γ-alumina, κ-alumina, δ-alumina, θ-alumina, η-alumina, χ-alumina, ρ-alumina, etc. may coexist. In addition, when the average particle size of the alumina powder becomes small, it becomes difficult to uniformly fill the metal. Therefore, the average particle size of the alumina powder is usually about 1 μm to about 10 μm. Since the high-temperature volatile component of the alumina powder causes generation of defects and the like during molding, the moisture of the alumina powder is preferably 0.1% or less, and Na 2 O is preferably 0.4% or less.
[0007]
The fine inorganic powder of the present invention has an average particle size of less than 1 μm, preferably 0.001 μm to 0.5 μm, a bulk density of 0.01 g / cm 3 to 1.0 g / cm 3 , and a difference angle of 15 ° to 30 °. , Preferably 18 ° to 28 °. When the average particle size of the fine inorganic powder is 1 μm or more, a sufficient sieving speed cannot be obtained. The lower limit of the average particle diameter is not particularly limited, but if it becomes smaller, it tends to scatter during mixing, etc., and the handling property is lowered. If the bulk density of the fine inorganic powder is out of the range of 0.01g / cm 3 ~1.0g / cm 3 , although the reason is not Tsumabiraka, not possible to obtain sufficient sieving processing speed. In addition, even when the difference angle of the fine inorganic powder is outside the range of 15 ° to 30 °, a sufficient sieving treatment speed cannot be obtained.
[0008]
The fine inorganic powder is not particularly limited as long as it satisfies the aforementioned average particle diameter, bulk density, and difference angle, but is usually at least one selected from the group consisting of silicon oxide, alumina, titanium oxide, and zirconium oxide. Seed, preferably silicon oxide or alumina.
[0009]
The content of the fine inorganic powder is at least 0.01 parts by weight, preferably 0.01 to 1 part by weight with respect to 100 parts by weight of the alumina powder. When the content is less than 0.01 parts by weight, the effect of improving the sieving treatment speed by adding the fine inorganic powder is not sufficient. On the other hand, the upper limit of the content of the fine inorganic powder is not particularly limited, but usually, the fine inorganic powder has a high BET specific surface area. Therefore, as the content increases, the BET specific surface area of the alumina powder increases and it becomes easy to absorb moisture.
[0010]
In the alumina powder for filling a metal composite material of the present invention, for example, a horizontal cylindrical mixer, a V-type mixer, a double-cone mixer, a ribbon-type mixer can be used as a method for adding fine inorganic powder to the alumina powder. There are methods using a mixer such as a machine, a screw type mixer, a high-speed fluidized type mixer, a rotating disk type mixer, an airflow stirring type mixer, a gravity drop mixer and the like.
[0011]
The alumina powder for filling a metal composite material of the present invention has a sufficient sieving speed and its powder physical properties are not unambiguous, but usually the average particle diameter is 1 μm to 10 μm, preferably 2 μm to 5 μm. in and, BET specific surface area of 0.2m 2 / g~10m 2 / g, preferably 0.5m 2 / g~5m 2 / g, bulk density 1.0g / cm 3 ~1.5g / cm 3. The difference angle is 5 ° or more, preferably 10 ° to 25 °.
[0012]
Second method for manufacturing a metallic composite material filling alumina powder of the present invention, based on the alumina powder 100 parts by weight, an average particle size of less than 1 [mu] m, a bulk density of 0.01g / cm 3 ~1.0g / cm 3 In addition, at least 0.01 part by weight of fine inorganic powder having a difference angle of 15 ° to 30 ° is added and mixed, and then sieved.
[0013]
The alumina powder of the present invention is not particularly limited and may be any conventionally known alumina powder. In particular, the alumina powder obtained by the Bayer method is recommended because of its low cost and availability of various particle sizes. The crystal form is preferably α-alumina alone, but γ-alumina, κ-alumina, δ-alumina, θ-alumina, η-alumina, χ-alumina, ρ-alumina, etc. may coexist. In addition, when the average particle size of the alumina powder becomes small, it becomes difficult to uniformly fill the metal. Therefore, the average particle size of the alumina powder is usually about 1 μm to about 10 μm. The high-temperature volatile component of the alumina powder causes defects during molding, etc., and reduces the mechanical strength of the resulting alumina powder for filling a metal composite material. Therefore, the moisture of the alumina powder is 0.1% or less, Na 2 O is preferably 0.4% or less.
[0014]
The fine inorganic powder of the present invention has an average particle size of less than 1 μm, preferably 0.001 μm to 0.5 μm, a bulk density of 0.01 g / cm 3 to 1.0 g / cm 3 , and a difference angle of 15 ° to 30 °. The fine inorganic powder is preferably 18 ° to 28 °. When the average particle diameter of the fine inorganic powder is 1 μm or more, a sufficient sieving speed cannot be obtained in the production of the alumina powder for filling a metal composite material. The lower limit of the average particle diameter is not particularly limited, but if it becomes smaller, it tends to scatter during mixing, etc., and the handling property is lowered. If the bulk density of the fine inorganic powder is out of the range of 0.01g / cm 3 ~1.0g / cm 3 , although the reason is not Tsumabiraka sufficient sieving processing speed in the production of metal composite material filling alumina powder Can't get. Further, even when the difference angle of the fine inorganic powder is out of the range of 15 ° to 30 °, it is not possible to obtain a sufficient sieving speed in the production of the alumina powder for filling the metal composite material.
[0015]
The addition amount of the fine inorganic powder is usually at least 0.01 parts by weight, preferably 0.01 to 1 part by weight, with respect to 100 parts by weight of the alumina powder. When the addition amount is less than 0.01 parts by weight, the effect of improving the sieving process speed by adding the fine inorganic powder is not sufficient. On the other hand, although there is no particular upper limit to the amount of fine inorganic powder added, since the fine inorganic powder usually has a high BET specific surface area, as the amount of addition increases, the BET specific surface area of the metal composite filling alumina powder increases. Since it becomes easy to absorb moisture, the mechanical strength of the metal composite material obtained by filling the alumina powder for filling the metal composite material may decrease.
[0016]
The mixing of the alumina powder and the fine inorganic powder of the present invention is not particularly limited as long as it is a conventionally known method. For example, horizontal cylindrical mixer, V type mixer, double cone type mixer, ribbon type mixer, screw type mixer, high-speed fluid type mixer, rotating disk type mixer, air flow stirring type mixer, gravity A drop mixer or the like is applicable. In mixing, the alumina powder and the fine inorganic powder may be added and mixed using a mixer.
[0017]
For the sieving of the present invention, a conventionally known sieving machine such as a fixed screen sieving machine or a screen sieving machine can be applied.
[0018]
In the production of the alumina powder for filling a metal composite material of the present invention, the alumina powder and the fine inorganic powder are added and mixed in a mixer and then sieved by a sieving machine. You may carry out by the method of pouring together an alumina powder and a fine inorganic powder. If necessary, sieving may be performed in two or more stages, or classification operations may be further combined.
[0019]
The alumina powder for filling a metal composite material obtained by the second method for producing an alumina powder for filling a metal composite material of the present invention has a sufficient sieving speed and reduced coarse particles. a powder, typically having an average particle diameter of 1 m to 10 m, preferably 2Myuemu～5myuemu, BET specific surface area of 0.2m 2 / g~10m 2 / g, preferably 0.5m 2 / g~5m 2 / g, and a bulk density of 1.0g / cm 3 ~1.5g / cm 3 , the difference angle is 5 ° or more, preferably 10 ° to 25 °.
[0020]
【The invention's effect】
As described above in detail, the alumina powder for filling a metal composite material of the present invention has a high sieving speed in the coarse sieving step, and the alumina powder for filling a metal composite material is sieved. Thus, it is possible to efficiently supply the alumina powder for filling a metal composite material with reduced coarse particles, and its industrial utility value is great.
[0021]
【Example】
The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by the examples. In the present invention, the average particle diameter, BET specific surface area, moisture, bulk density, difference angle, Na 2 O, and sieving speed were measured by the following methods.
[0022]
Average particle diameter D 50 (μm): Measured with a laser scattering particle size distribution meter (Microtrac HRA manufactured by LEED & NORTHHRUP).
BET specific surface area (m 2 / g): Measured by nitrogen adsorption method.
Moisture (%): Obtained from weight loss during heating at 110 ° C. for 24 hours.
Bulk density (g / cm 3 ): After pouring the powder into a 200 ml graduated cylinder, the bulk density of the powder obtained by tapping 100 times is measured.
Difference angle (°): Determined from the difference between the angle of repose and the collapse angle measured using a powder tester PT-E type (manufactured by Hosokawa Micron Corporation).
Na 2 O (%): according to JIS H1901.
Sieving speed (kg / hr · m 2 ): Vibrating sieving machine 502 type [manufactured by Dalton Co., Ltd., weight phase angle 60 °, sieving (JIS Z8801 old standard opening 350 mesh 44 μm, The effective mesh diameter was 450 mmφ)], and the sieving speed was determined from the weight of the sample passing through the sieve. The sample was supplied at a maximum supply amount in which a circle formed by the powder on the sieve was ½ of the effective mesh diameter (220 mmφ to 230 mmφ).
[0023]
Examples 1 and 2
Alumina A obtained by the Bayer method (center particle size 2.9 μm, BET specific surface area 1.3 m 2 / g, bulk density 1.27 g / cm 3 , angle of repose 48 °, difference angle 3 °, Na 2 O 0. 04%, moisture 0.06%) and alumina B obtained by the vapor phase method (center particle diameter less than 0.1 μm, BET specific surface area 100 m 2 / g, bulk density 0.05 g / cm 3 , difference angle 21 ° ) Were added and mixed under the conditions shown in Table 1, and the physical properties and sieving speed of the obtained mixed powder were determined. The results are shown in Table 1. In addition, coarse particles were reduced in the obtained mixed powder.
[0024]
Example 3
Alumina A obtained by the Bayer method and silica A obtained by the gas phase method (center particle diameter less than 0.1 μm, BET specific surface area 110 m 2 / g, bulk density 0.05 g / cm 3 , difference angle 21 °) Were added and mixed under the conditions shown in Table 1, and the physical properties and sieving speed of the obtained mixed powder were determined. The results are shown in Table 1.
[0025]
Examples 4 and 5
Alumina A obtained by the Bayer method and alumina C obtained by the alkoxide method (center particle diameter less than 0.1 μm, BET specific surface area 140 m 2 / g, bulk density 0.10 g / cm 3 , difference angle 23 °) It added and mixed on the conditions shown in Table 1, and calculated | required the physical property and sieving speed of the obtained mixed powder. The results are shown in Table 1.
[0026]
Comparative Example 1
The sieving speed of alumina A was determined. The results are shown in Table 1.
[0027]
Comparative Example 2
The sieving speed of alumina B was determined. The results are shown in Table 1.
[0028]
Comparative Example 3
The sieving speed of alumina C was determined. The results are shown in Table 1.
[0029]
Comparative Example 4
The sieving speed of silica A was determined. The results are shown in Table 1.
[0030]
[Table 1]
Claims (6)
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| JP18878898A JP4144071B2 (en) | 1998-07-03 | 1998-07-03 | Alumina powder for filling metal composite material and method for producing the same |
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