JPH01111829A - Composite material - Google Patents

Composite material

Info

Publication number
JPH01111829A
JPH01111829A JP26795887A JP26795887A JPH01111829A JP H01111829 A JPH01111829 A JP H01111829A JP 26795887 A JP26795887 A JP 26795887A JP 26795887 A JP26795887 A JP 26795887A JP H01111829 A JPH01111829 A JP H01111829A
Authority
JP
Japan
Prior art keywords
whiskers
aluminum
mixture
powder
composite material
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.)
Granted
Application number
JP26795887A
Other languages
Japanese (ja)
Other versions
JP2824521B2 (en
Inventor
Jun Shimizu
清水 遵
Masahiko Kawai
川井 正彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Aluminum KK
Original Assignee
Toyo Aluminum KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyo Aluminum KK filed Critical Toyo Aluminum KK
Priority to JP62267958A priority Critical patent/JP2824521B2/en
Publication of JPH01111829A publication Critical patent/JPH01111829A/en
Application granted granted Critical
Publication of JP2824521B2 publication Critical patent/JP2824521B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To develop a composite material which consists of Al as a matrix and whiskers as a reinforcing material and has high specific strength and high specific rigidity and excellent heat resistance by mixing the whiskers having an acicular form as the reinforcing material at a specific ratio with fine powder of Al. CONSTITUTION:An org. solvent such as mineral spirit is added to the powder of the Al or Al alloy ground by an air atomization method and the mixture is wet ground by a ball mill, etc., by which the mixture is ground to the fine powder state of about 3mum grain size. The mixture is subjected to classification and suction filtration and the remaining mineral spirit is replaced with a solvent of a low b.p. such as isopropanol which does not form a compd. with Al. The whiskers of SiC, Si3N4, Al2O3, K2O, 6TiO2, etc., having about 0.1-1mum diameter and about 5-200mum length uniformly mixed with such powder at the ratios of 99-50vol.% whiskers. The mixture is again subjected to the suction filtartion, then to heating and degassing under a reduced pressure, followed by extrusion, by which the whisker-reinforced composite Al material is produced.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、アルミニウムとウィスカーとからなる複合材
に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composite material consisting of aluminum and whiskers.

なお、本願明細書においては、アルミニウム及びその合
金を一括してアルミニウムと指称するものとする。
In addition, in this specification, aluminum and its alloys shall be collectively referred to as aluminum.

従来技術とその問題点 アルミニウムと5iCSSi3N4、K2O・6 T 
i O2等のウィスカーとからなるウィスカー強化アル
ミニウム複合材は、高比強度、高比剛性率及び良好な耐
熱性を備えているので、航空機、宇宙船等の宇宙航空機
器分野、自動車、船等の輸送機器分野、スポーツ用品乃
至器具等の一般的分野等での構造乃至機能部品用の素材
として、注目されている。
Conventional technology and its problems Aluminum and 5iCSSi3N4, K2O・6T
Whisker-reinforced aluminum composite materials made of whiskers such as iO2 have high specific strength, high specific rigidity, and good heat resistance, so they are suitable for aerospace equipment fields such as aircraft and spacecraft, automobiles, ships, etc. It is attracting attention as a material for structural and functional parts in general fields such as transportation equipment and sporting goods and appliances.

公知のウィスカー強化アルミニウム複合材の製造方法は
、(イ)あらかじめ作成したウィスカーのプリフォーム
内の空間にアルミニウムの溶湯を加圧下に含浸させた後
、冷却させる高圧凝固鍛造法と(ロ)ウィスカーとアル
ミニウム合金粉末とを混合した後、圧縮成形させる粉末
冶金法とに大別される。
Known methods for producing whisker-reinforced aluminum composite materials include (a) a high-pressure solidification forging method in which the space within a whisker preform prepared in advance is impregnated with molten aluminum under pressure, and then cooled; and (b) a whisker and It is broadly divided into powder metallurgy, which involves mixing aluminum alloy powder and compression molding.

(イ)の方法は、ウィスカーのプリフォーム製造という
煩雑な工程を必要とするとともに、アルミニウムの溶湯
含浸時にその高い溶湯圧力の為にプリフォーム自体が変
形することがあり、複合材中のウィスカーの体積分率を
制御することが困難である。
Method (a) requires a complicated process of manufacturing a preform with whiskers, and the preform itself may be deformed due to the high pressure of the molten aluminum when impregnated with molten aluminum. It is difficult to control the volume fraction.

一方、(ロ)の方法では、(イ)の方法におけるとは異
なった問題点が存在する。一般に、ウィスカーは、直径
0.1〜1μm程度、長さ5〜200μm程度の針状形
態をなしており、繊維相互が絡まりあって、いわゆる“
もぐさ状“を呈している。従って、アルミニウム粉との
均一混合のためには、先ずこの絡まりを十分にほぐした
後、混合を行う必要がある。特開昭59−185701
号公報及び60−251922号公報には、ウィスカー
の絡まりをほぐして、アルミニウム粉と均一に混合させ
る方法が開示されている。しかしながら、ウィスカーの
絡まりがほぐされたとしても、混合するアルミニウム粉
末の粒径が大きければ、その後の固化成形工程において
、ウィスカーがアルミニウム粒子間の隙間に集中して、
アルミニウムマトリックスとの均一な分散は、望み難い
On the other hand, method (b) has different problems than method (b). Generally, whiskers have a needle-like shape with a diameter of about 0.1 to 1 μm and a length of about 5 to 200 μm, and the fibers are entangled with each other, so-called “
Therefore, in order to mix uniformly with the aluminum powder, it is necessary to loosen the tangles sufficiently before mixing. JP-A-59-185701
No. 60-251922 discloses a method of disentangling whiskers and uniformly mixing them with aluminum powder. However, even if the tangles of the whiskers are loosened, if the particle size of the aluminum powder to be mixed is large, the whiskers will concentrate in the gaps between the aluminum particles in the subsequent solidification and molding process.
Uniform dispersion with the aluminum matrix is difficult to achieve.

このことは、特にウィスカーの体積分率の大きい複合材
を製造する場合に顕著となる。この問題点を解決する唯
一の方法は、使用する金属粉の粒径を出来るだけ小さく
することである。しかしながら、現在工業的に人手容易
なマイナス350メツシユ程度のアルミニウム粉を使用
する場合には、得られる複合材の特性が十分ではなく、
更に粒径の小さなアルミニウム粉(例えば3μm程度)
を使用することが好ましい。現在、この様な微細なアル
ミニウム粉は、一般のアトマイズ粉末を分級して微粉を
採取することにより製造されているため、収率が極めて
低く、コスト高となっている。
This becomes especially noticeable when producing a composite material with a large volume fraction of whiskers. The only way to solve this problem is to reduce the particle size of the metal powder used as much as possible. However, when using aluminum powder of about -350 mesh, which is currently industrially easy to use, the properties of the resulting composite material are not sufficient.
Aluminum powder with even smaller particle size (e.g. about 3 μm)
It is preferable to use Currently, such fine aluminum powder is produced by classifying general atomized powder and collecting fine powder, resulting in extremely low yield and high cost.

更に、アルミニウム粉末の分級には、粉塵爆発という危
険性も存在する。
Furthermore, there is a risk of dust explosion when classifying aluminum powder.

問題点を解決するための手段 本発明者は、上述の如き従来技術の現状に鑑みて種々研
究を重ねた結果、アトマイズ粉末の分級により得られる
アルミニウム微粉末に代えてアトマイズ粉末を湿式粉砕
して得られるフレーク状のアルミニウム粉末を使用する
場合には、従来技術の問題点が大巾に軽減されることを
見出した。すなわち、本発明は、アルミニウムの湿式粉
砕粉をマトリックス成分とし、ウィスカーを強化材とす
る複合材を提供するものである。
Means for Solving the Problems As a result of various studies in view of the current state of the prior art as described above, the inventor of the present invention has developed a method of wet-pulverizing atomized powder in place of fine aluminum powder obtained by classifying atomized powder. It has been found that the problems of the prior art are greatly alleviated when the resulting flaky aluminum powder is used. That is, the present invention provides a composite material having wet-pulverized aluminum powder as a matrix component and whiskers as a reinforcing material.

本発明においてマトリックス成分として使用するフレー
ク状アルミニウム粉末は、常法にしたがって、アトマイ
ズアルミニウム粉末等の通常のアルミニウム粉末を有機
溶媒中で少量の粉砕助剤の存在下に粉砕し、分級し、吸
引濾過して該有機溶媒を除去した後、沸点が低く、アル
ミニウムと化合物を作らず且つ低毒性の他の溶媒で置換
することにより、得られる。使用する有機溶媒としては
、ミネラルスピリット、ホワイトスピリット、ソルベン
トナフサ、ブチルセロソルブ等が例示され、粉砕助剤と
しては、ステアリン酸、オレイン酸、イソステアリン酸
等の脂肪酸が例示され、置換用の溶剤としては、例えば
エタノール、(イソ)プロパツール、(イソ)ブタノー
ル等が例示され、粉砕手段としては、ボールミル、アト
ライターミル、振動ミル等が例示される。被粉砕物の直
径、厚さ、表面状況等は、粉砕に使用するアルミニウム
粉末の粒度及び粉砕条件等により、定まるが、例えば、
マイナス100メツシユの空気アトマイズアルミニウム
粉末を粉砕原料とする場合には、350メツシユ篩をほ
ぼ100%通過するフレーク状の被粉砕物が容易に得ら
れる。この場合のフレーク状被粉砕物の直径は、45μ
m以下(平均直径的10〜20μm程度)であり、厚さ
は、1μm以下である。本発明で使用するアルミニウム
のフレーク状被粉砕物は、更に、BET法による比表面
積が、1rrf/g以上であることが好ましい。
The flaky aluminum powder used as a matrix component in the present invention is obtained by grinding ordinary aluminum powder such as atomized aluminum powder in an organic solvent in the presence of a small amount of grinding aid, classifying it, and filtering it by suction. After removing the organic solvent, the organic solvent is replaced with another solvent that has a low boiling point, does not form a compound with aluminum, and has low toxicity. Examples of organic solvents to be used include mineral spirit, white spirit, solvent naphtha, butyl cellosolve, etc. Examples of grinding aids include fatty acids such as stearic acid, oleic acid, and isostearic acid, and examples of solvents for substitution include: Examples include ethanol, (iso)propertool, (iso)butanol, etc., and examples of the crushing means include a ball mill, an attritor mill, and a vibration mill. The diameter, thickness, surface condition, etc. of the object to be crushed are determined by the particle size of the aluminum powder used for crushing, the crushing conditions, etc.
When air atomized aluminum powder with a minus 100 mesh is used as the raw material for pulverization, it is easy to obtain a flaky material that passes through a 350 mesh sieve almost 100% of the time. In this case, the diameter of the flake-like material to be crushed is 45μ
m or less (about 10 to 20 μm in average diameter), and the thickness is 1 μm or less. It is further preferable that the flaky aluminum material to be ground used in the present invention has a specific surface area of 1 rrf/g or more as measured by the BET method.

比表面積が、1rri’/g未満の場合には、ウィスカ
ーとの間で均一な混合物が形成され難く、最終的に得ら
れる成形体の強度及び伸びが不十分となる。
If the specific surface area is less than 1 rri'/g, it will be difficult to form a uniform mixture with the whiskers, and the strength and elongation of the final molded product will be insufficient.

いうまでもなく、上述のアルミニウムの湿式粉砕におけ
有機溶剤、粉砕助剤、粉砕手段等は、全て公知のもので
あり、本発明で使用するアルミニウム粉末は、上記に例
示した製造方法により、限定されるものではない。
Needless to say, the organic solvent, grinding aid, grinding means, etc. used in the above-mentioned wet grinding of aluminum are all known, and the aluminum powder used in the present invention can be manufactured using the manufacturing method exemplified above. It is not something that will be done.

本発明で使用するウィスカーとしては、特に限定されず
、5iCSSi3N4、AQ203、K2O・6 T 
t O2等の公知のウィスカー材料が使用される。使用
に際しては、これらのウィスカーの絡まり状態を予めほ
ぐしておくことも、従来技術におけると同様である。
The whiskers used in the present invention are not particularly limited, and include 5iCSSi3N4, AQ203, K2O・6T
Known whisker materials such as tO2 are used. Before use, the tangled state of these whiskers must be loosened in advance, as in the prior art.

アルミニウムの湿式粉砕粉とウィスカーとの混合割合は
、強化複合材の用途、ウィスカーの種類等により、変わ
り得るが、前者99〜50容積%に対し後者1〜50容
積%程度とすることが好ましい。
The mixing ratio of the wet-pulverized aluminum powder and the whiskers may vary depending on the use of the reinforced composite material, the type of whiskers, etc., but it is preferable that the former be 99-50 volume % and the latter about 1-50 volume %.

本発明複合材は、前述の低沸点で、アルミニウムと化合
物を作らず且つ低毒性の溶媒中で両者を均一に混合した
後、溶媒を除去し、以後常法に従って、缶に詰め、減圧
下に脱ガスし、封缶し、熱間若しくは冷間で押出し成形
することにより、製造される。
The composite material of the present invention has a low boiling point, does not form a compound with aluminum, and is homogeneously mixed in a low toxicity solvent, and then the solvent is removed. Thereafter, the composite material is packed in a can according to a conventional method and placed under reduced pressure. It is manufactured by degassing, sealing, and hot or cold extrusion.

発明の効果 本発明によるウィスカー強化複合材は、アルミニウムマ
トリックスとウィスカーとが均一に分布しているので、
強度、伸び等の機械的特性に優れている。また、製造に
際しては、アルミニウムの湿式粉砕から成形に至るまで
の工程を空気を遮断して行うことが可能なので、粉塵爆
発の危険性を除(ことができるとともに、複合材中の酸
素含有量を低く押さえることが出来る。
Effects of the Invention The whisker-reinforced composite material according to the present invention has uniform distribution of aluminum matrix and whiskers, so that
Excellent mechanical properties such as strength and elongation. In addition, during manufacturing, the process from wet grinding of aluminum to molding can be performed with air excluded, which eliminates the risk of dust explosions and reduces the oxygen content in the composite material. It can be held low.

実施例 以下実施例を示し、本発明の特徴とするところをより一
層明らかにする。
EXAMPLES Hereinafter, examples will be shown to further clarify the features of the present invention.

実施例1 マイナス100メツシユの空気アトマイズアルミニウム
粉末(AA6061)1kgとミネラルスピリット2Q
とを直径50cm、長さ18cm、含有スチールボール
(直径1/4インチ)のffi 50 kgのボールミ
ルに入れ、56rpmで6時間粉砕した。被粉砕物を3
50メツシユのスクリーンを通過させた後、吸引濾過し
、残存するミネラルスピリットをイソプロパツールによ
り置換した。
Example 1 Minus 100 mesh air atomized aluminum powder (AA6061) 1kg and mineral spirit 2Q
and were placed in an ffi 50 kg ball mill with a diameter of 50 cm and a length of 18 cm, containing steel balls (1/4 inch in diameter) and milled at 56 rpm for 6 hours. 3 pieces of material to be crushed
After passing through a 50-mesh screen, it was filtered with suction, and the remaining mineral spirit was replaced with isopropanol.

上記のイソプロパツールに分散されたアルミニウム粉砕
物(直径44μm以下、平均粒径約10〜30μm1厚
さ1μm以下)と予めイソプロパツールに十分分散させ
たに20・6 T iO2ウイスカーとを、ウィスカー
の体積分率が20%となるような割合で、均一に混合し
た後、再び吸引濾過し、アルミニウム缶に詰め、520
℃で2時間減圧下に脱ガスした。脱ガス終了後、封缶し
、520°Cで押出比10で熱間押出しを行い、ウィス
カー強化アルミニウム複合材を得た。
The aluminum pulverized material (diameter 44 μm or less, average particle size approximately 10 to 30 μm, thickness 1 μm or less) dispersed in the above isopropanol and the 20.6 TiO2 whiskers that had been sufficiently dispersed in the isopropanol in advance were mixed into whiskers. After uniformly mixing in such a proportion that the volume fraction of
Degassed under reduced pressure for 2 hours at °C. After degassing, the can was sealed and hot extruded at 520°C and an extrusion ratio of 10 to obtain a whisker-reinforced aluminum composite.

下記第1表に湿式粉砕アルミニウムの比表面積とT−6
処理後の機械的強度を示す。なお、第1表には、実施例
2及び比較例1〜2の結果をも併せて示す。
Table 1 below shows the specific surface area of wet-milled aluminum and T-6.
Indicates mechanical strength after treatment. Note that Table 1 also shows the results of Example 2 and Comparative Examples 1 and 2.

実施例2 ボールミルによるアルミニウム粉末の粉砕時間を2時間
とする以外は実施例1と同様にしてウィスカー強化アル
ミニウム複合材を得た。
Example 2 A whisker-reinforced aluminum composite material was obtained in the same manner as in Example 1, except that the time for pulverizing the aluminum powder by the ball mill was 2 hours.

比較例1 ウィスカーを使用しない以外は実施例1と同様にしてア
ルミニウム押出し材を得た。
Comparative Example 1 An aluminum extrusion material was obtained in the same manner as in Example 1 except that whiskers were not used.

比較例2 湿式粉砕アルミニウム粉末に代えてマイナス350メツ
シユの空気アトマイズアルミニウム粉末を使用する以外
は実施例1と同様にしてウィスカー強化アルミニウム複
合材を得た。
Comparative Example 2 A whisker-reinforced aluminum composite material was obtained in the same manner as in Example 1, except that minus 350 mesh air atomized aluminum powder was used in place of the wet-milled aluminum powder.

第1表に示す結果から明らかなように、ウィスカーを強
化材として使用し且つマトリックス成分として湿式粉砕
アルミニウム粉砕物を使用する本発明複合材は、強度に
優れ、伸びも大きい。
As is clear from the results shown in Table 1, the composite material of the present invention, which uses whiskers as reinforcing materials and wet-milled aluminum pulverized material as a matrix component, has excellent strength and high elongation.

(以 上) f1″ゝ、(that's all) f1″ゝ、

Claims (1)

【特許請求の範囲】[Claims] (1)アルミニウムの湿式粉砕粉をマトリックス成分と
し、ウィスカーを強化材とする複合材。
(1) A composite material containing wet-milled aluminum powder as a matrix component and whiskers as a reinforcing material.
JP62267958A 1987-10-22 1987-10-22 Composite Expired - Lifetime JP2824521B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62267958A JP2824521B2 (en) 1987-10-22 1987-10-22 Composite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62267958A JP2824521B2 (en) 1987-10-22 1987-10-22 Composite

Publications (2)

Publication Number Publication Date
JPH01111829A true JPH01111829A (en) 1989-04-28
JP2824521B2 JP2824521B2 (en) 1998-11-11

Family

ID=17451957

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62267958A Expired - Lifetime JP2824521B2 (en) 1987-10-22 1987-10-22 Composite

Country Status (1)

Country Link
JP (1) JP2824521B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115679229A (en) * 2022-12-12 2023-02-03 西安稀有金属材料研究院有限公司 Potassium titanate whisker reinforced aluminum matrix composite material and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60116735A (en) * 1983-11-30 1985-06-24 Showa Alum Corp Manufacture of fiber reinforced aluminum material
JPS6187837A (en) * 1984-10-08 1986-05-06 Toyota Motor Corp Production of fiber reinforced composite metallic material
JPS61246335A (en) * 1985-04-24 1986-11-01 Honda Motor Co Ltd Metal member strengthened with fiber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60116735A (en) * 1983-11-30 1985-06-24 Showa Alum Corp Manufacture of fiber reinforced aluminum material
JPS6187837A (en) * 1984-10-08 1986-05-06 Toyota Motor Corp Production of fiber reinforced composite metallic material
JPS61246335A (en) * 1985-04-24 1986-11-01 Honda Motor Co Ltd Metal member strengthened with fiber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115679229A (en) * 2022-12-12 2023-02-03 西安稀有金属材料研究院有限公司 Potassium titanate whisker reinforced aluminum matrix composite material and preparation method thereof
CN115679229B (en) * 2022-12-12 2023-11-17 西安稀有金属材料研究院有限公司 Potassium titanate whisker reinforced aluminum matrix composite material and preparation method thereof

Also Published As

Publication number Publication date
JP2824521B2 (en) 1998-11-11

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