JP3149577B2 - Surface treatment method of Ti-Al intermetallic compound - Google Patents
Surface treatment method of Ti-Al intermetallic compoundInfo
- Publication number
- JP3149577B2 JP3149577B2 JP30809192A JP30809192A JP3149577B2 JP 3149577 B2 JP3149577 B2 JP 3149577B2 JP 30809192 A JP30809192 A JP 30809192A JP 30809192 A JP30809192 A JP 30809192A JP 3149577 B2 JP3149577 B2 JP 3149577B2
- Authority
- JP
- Japan
- Prior art keywords
- intermetallic compound
- treatment method
- surface treatment
- treatment
- present
- 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
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はＴi-Ａl 系金属間化合物
の表面を処理して硬化させる方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating and curing the surface of a Ti-Al intermetallic compound.
【０００２】[0002]
【従来の技術】Ｔi 系材料は軽量で比強度が高く、特に
Ｔi-Ａl 系金属間化合物は高温での強度が高く、例えば
内燃機関用のカムやバルブ等の高温での往復部品や回転
部品等の材料として極めて適するものであると言われて
いる。2. Description of the Related Art Ti-based materials are lightweight and have a high specific strength. In particular, Ti-Al-based intermetallic compounds have high strength at high temperatures. For example, reciprocating parts and rotating parts at high temperatures such as cams and valves for internal combustion engines. It is said that the material is extremely suitable as a material for the above.
【０００３】しかしながら上記Ｔi-Ａl 系金属間化合物
はブレーキ部品等にみるように高速摺動等の過酷な条件
下における耐摩耗性が充分でないと言う欠点がある。上
記Ｔi-Ａl 系金属間化合物の欠点を改良するための手段
として、従来プラズマアーク溶射によってＴi-Ａl 系金
属間化合物の表面にＴi Ｃを分散した硬化層を形成させ
て耐摩耗性を付与する方法が提案されている（例えば特
願平３−２１１６２４号、特願平３−２３１７０９
号）。However, the Ti-Al-based intermetallic compound has a drawback that the wear resistance under severe conditions such as high-speed sliding is not sufficient as seen in brake parts and the like. As a means for improving the drawbacks of the Ti-Al intermetallic compound, a hardened layer in which TiC is dispersed is formed on the surface of the Ti-Al intermetallic compound by plasma arc spraying to impart abrasion resistance. Methods have been proposed (for example,
Cancer flat No. 3-211624, JP Application flat 3-231709
issue).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の改良手段にあっては、Ｔi-Ａl 系金属間化合物の表
面を比較的狭い範囲で処理するには有効であるが、広い
範囲にわたって耐摩耗性を付与するにはコストが高くな
る。またＴi-Ａl 系金属間化合物を上記処理した後に機
械部品等に使用するためには、Ｔi-Ａl 系金属間化合物
表面に形成されたＴi Ｃ分散硬化層の凹凸を切削、研磨
等の最終加工によって除去しなければならないと言う手
間がかゝる。更に上記従来の改良手段ではＴi Ｃ分散硬
化層は深くなり、Ｔi-Ａl 系金属間化合物の極く表層の
みを硬化させることは困難である。However, the above-mentioned conventional improvement means is effective for treating the surface of the Ti-Al-based intermetallic compound in a relatively narrow range, but has a wide range of wear resistance. In order to impart the property, the cost increases. Further, in order to use the Ti-Al-based intermetallic compound for machine parts after the above treatment, the irregularities of the TiC dispersion hardened layer formed on the surface of the Ti-Al-based intermetallic compound are subjected to final processing such as cutting and polishing. It has to be said that it has to be removed. Further, with the above-mentioned conventional improvement means, the TiC dispersion hardened layer becomes deep, and it is difficult to harden only the very surface layer of the Ti-Al intermetallic compound.
【０００５】[0005]
【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、Ｔi-Ａl 系金属間化合物
の表面を浸炭によって硬化させるＴi-Ａl 系金属間化合
物の表面処理方法を提供し、更にＴi-Ａl 系金属間化合
物の表面付近にＴi を濃化させた後、該表面を浸炭によ
って硬化させるＴi-Ａl 系金属間化合物の表面処理方法
およびＴi-Ａl系金属間化合物の表面に強アルカリを接
触せしめることによって該表面付近のＴi を濃化させた
後浸炭によって硬化させるＴi-Ａl 系金属間化合物の表
面処理方法を提供するものである。The present invention SUMMARY OF] as a means for solving the conventional problems described above, the surface treatment of Ti-Al system intermetallic compound to be thus cured charcoal immersed surface of the Ti-Al system intermetallic compound It provides a method, after further concentrating the Ti near the surface of the Ti-Al intermetallic compound, the surface treatment of Ti-Al system intermetallic compound to cure I by <br/> charcoal immersion the surface to provide a surface treatment method of the Ti-Al system intermetallic compound to be thus hardened carburizing after thickening the Ti in the vicinity of the surface by brought into contact with strong alkali to the surface of the methods and Ti-Al system intermetallic compound Things.
【０００６】本発明を以下に詳細に説明すれば、本発明
に用いられるＴi-Ａl 系金属間化合物とは、Ｔi Ａl,Ｔ
i3Ａl,もしくはＴi Ａl-Ｔi3Ａl 等であり、若干のβ
相、Ｔi Ａl3相等が生成していても差支えなく、上記Ｔ
i-Ａl 系金属間化合物を部品とするには通常、恒温鍛造
法、鋳造法、粉末冶金法等どのような公知の方法が適用
されてもよい。上記Ｔi-Ａl 系金属間化合物は上記のよ
うにしてバルブ、ブレーキ用品等の部品とされ、該部品
の表面を浸炭によって硬化させる。The present invention will be described in detail below. The Ti-Al intermetallic compound used in the present invention is Ti Al, T
i 3 Al or Ti Al-Ti 3 Al, etc.
Phase, TiAl 3 phase, etc., may be formed.
In order to make the i-Al intermetallic compound into a part, any known method such as a constant temperature forging method, a casting method, and a powder metallurgy method may be applied. The Ti-Al system intermetallic compound valve as described above, is a component such as a brake equipment, is thus cured charcoal immersed surface of the component.
【０００７】上記浸炭にはどのような公知の方法が適用
されてもよいが、望ましい方法としてはメタンガス、エ
チレンガス、プロパンガス、一酸化炭素等の炭素化合物
のガスのプラズマ処理による方法がある。[0007] may be the immersion any methods known to coal applications, but methane as desired method, ethylene gas, propane gas, the method according to gas plasma treatment of carbon compounds such as carbon monoxide is there.
【０００８】上記浸炭処理の前に上記Ｔi-Ａl 系金属間
化合物の部品の表面付近にＴi を濃化させておくことが
望ましい。該部品の表面付近にＴi を濃化させるには、
例えば浸漬、スプレー等の手段によってカセイソーダ、
カセイカリ等の強アルカリの水溶液を該部品表面に接触
せしめ、該部品表面付近のＡl を該強アルカリ水溶液に
溶出させる。[0008] It is desirable that by concentrating the Ti in the vicinity of the surface of the part of the immersion Sumisho the Ti-Al system intermetallic compound prior to sense. To enrich Ti near the surface of the part,
For example, caustic soda by means of dipping, spraying, etc.
An aqueous solution of a strong alkali such as caustic is brought into contact with the surface of the component, and Al near the surface of the component is eluted into the aqueous solution of the strong alkali.
【０００９】[0009]
【作用】本発明ではＴi-Ａl 系金属間化合物の表面を浸
炭してＴi の炭化物を形成させ、硬度を高め耐摩耗性を
向上させる。このような浸炭処理によれば、Ｔi-Ａl 系
金属間化合物表面を広い範囲にわたって処理することが
容易に出来る。Ｔi-Ａl 系金属間化合物表面付近にＴi
を濃化させておけば、炭化物が形成された後のマトリッ
クス組成がＡl リッチとならず、Ｔi3Ａl および／また
はＴiＡl から構成されるので、割れ感受性を下げるこ
とが出来る。According to the present invention, the surface of the Ti-Al intermetallic compound is immersed.
And charcoal to form a carbide of Ti, improving the enhanced abrasion resistance hardness. According to the carburizing treatment, Ti-Al system intermetallic compound surface that is easily to handle over a wide range. Ti-Al-based intermetallic compound
If by concentrating the matrix composition after carbides are formed is not the Al-rich, since it is composed of Ti 3 Al and / or TiAl, it is possible to reduce the cracking susceptibility.
【００１０】[0010]
【実施例】〔実施例１〕 ３３．５重量％のＡl を含有するＴi-Ａl 系金属間化合
物をプラズマスカル溶解によって８Kgのインゴットに鋳
造した。該インゴットから直径８mm，長さ２５mmのピン
状の素材を切出した。上記素材についてプラズマ浸炭処
理を行なった。プラズマ浸炭処理については１．５Ｔor
r 圧のＡr-プロパンガス混合ガス中９００℃，３時間処
理した。このようにして各素材には表面から１０〜１０
０μｍ厚で浸炭処理による硬化層が形成される。EXAMPLES Example 1 A Ti-Al-based intermetallic compound containing 33.5% by weight of Al was cast into an 8 kg ingot by plasma skull melting. A pin-shaped material having a diameter of 8 mm and a length of 25 mm was cut out from the ingot. Plasma carburizing for the above materials
Was performed. 1.5 Torr for plasma carburizing
r-propane mixed gas at 900 ° C for 3 hours
I understood . In this way, each material has 10 to 10
0μm hardened layer by carburizing treatment in thickness is formed.
【００１１】上記処理を行なったピンについて摩擦摩耗
試験を行なった。即ち常温にてＳＵＪ２（ＨＲＣ６１）
を材料として直径５５mm、厚さ５mmのディスクを周速
７．５ｍ／分で回転させ、該ディスクの表面へ潤滑油を
使用することなく乾式で上記処理したピンの先端を荷重
１０Kgf で押付け、３Kmの距離分ピンとディスクとを擦
過せしめた後、ピンとディスクとの減量を測定する。そ
の結果を表１に示す。A friction and wear test was performed on the pins that had been subjected to the above treatment. That is, SUJ2 (HRC61) at room temperature
A disk having a diameter of 55 mm and a thickness of 5 mm is rotated at a peripheral speed of 7.5 m / min. After rubbing the pin and the disc by the distance of, the weight loss between the pin and the disc is measured. Table 1 shows the results.
【表１】 [Table 1]
【００１２】表１によれば、本発明の浸炭処理品は未処
理品に比して摩耗量がはるかに少ないことが明らかであ
る。[0012] According to Table 1, it is clear that the carburized article of the present invention has a much smaller wear amount than the untreated article.
【００１３】〔実施例２〕 実施例１で使用したピン状の素材を０．５Ｎのカセイソ
ーダ水溶液に１０分間浸漬した後水洗し、実施例１と同
様な浸炭処理を行なう。このようにして得られたピンに
ついて実施例１と同様な摩擦摩耗試験を行なった。その
結果は表２に示される。[0013] Example 2 a pin-like material used in Example 1 then washed with water was immersed for 10 minutes in sodium hydroxide aqueous solution of 0.5 N, performs a similar carburizing treatment as in Example 1. The pin thus obtained was subjected to the same friction and wear test as in Example 1. The results are shown in Table 2.
【表２】 [Table 2]
【００１４】表２によれば、アルカリ処理を行なった本
実施例のピンは、表１に示すアルカリ処理を行なわない
未処理品よりも摩耗量が少なくなる。According to Table 2, the pins of this embodiment which have been subjected to the alkali treatment do not undergo the alkali treatment shown in Table 1.
Abrasion loss than untreated decreases.
【００１５】〔実施例３〕 ３３．５重量％のＡl を含有するＴi-Ａl 系金属間化合
物により軸径７mm，傘径３０mm，全長約１００mmのバル
ブを作製し、該バルブから直径６．５mm，長さ４５mmの
素材を切出した。上記素材について、１．０Ｔorr 圧の
Ａr-プロパンガス−Ｈ2 混合ガス中８５０℃，３時間の
プラズマ浸炭処理行なった。上記処理品について、ファ
ビリー型摩耗試験機により、荷重２００Kg，摩擦速度
０．１ｍ／秒，試験距離６１．３ｍ，潤滑油を使用しな
い乾式条件において摩耗試験を行なった。結果を表３に
示す。Example 3 A valve having a shaft diameter of 7 mm, an umbrella diameter of 30 mm, and a total length of about 100 mm was manufactured from a Ti-Al-based intermetallic compound containing 33.5% by weight of Al, and a diameter of 6.5 mm was obtained from the valve. , 45mm long material was cut out. The above material was subjected to plasma carburizing at 850 ° C. for 3 hours in an Ar-propane gas-H 2 mixed gas at a pressure of 1.0 Torr. The treated product was subjected to an abrasion test using a Fabry-type abrasion tester under a dry condition under a load of 200 kg, a friction speed of 0.1 m / sec, a test distance of 61.3 m, and no lubricating oil. Table 3 shows the results.
【表３】 [Table 3]
【００１６】表３によれば、浸炭処理品の摩耗量は未処
理品に比してはるかに少ないことが明らかである。According to Table 3, it is clear that the wear amount of the carburized product is much smaller than that of the untreated product.
【００１７】[0017]
【発明の効果】したがって本発明においては高温での強
度が高いＴi-Ａl 系金属間化合物の耐摩耗性を格段に向
上させることが出来、本発明は内燃機関用のカムやバル
ブ、ブレーキ用部品等に適用して極めて有用である。な
お本発明の処理は上記品の一部にのみ施されてもよく、
例えばバルブについて言えば本発明の処理はバルブ全
体、あるいは軸部、軸端、傘部の少なくとも１個所以上
に施されてもよい。Accordingly, in the present invention, the wear resistance of Ti-Al-based intermetallic compounds having high strength at high temperatures can be remarkably improved, and the present invention provides cams, valves and brake parts for internal combustion engines. It is very useful to apply to such as. Note that the treatment of the present invention may be performed only on a part of the above-mentioned products,
For example, regarding the valve, the processing of the present invention may be performed on the entire valve, or at least one or more of the shaft portion, the shaft end, and the umbrella portion.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 8/20,8/02,8/24 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) C23C 8/20, 8/02, 8/24
Claims (3)
って硬化させることを特徴とするＴi-Ａl 系金属間化合
物の表面処理方法The surface treatment method according to claim 1] Ti-Al system intermetallic compound, characterized in that curing I by <br/> charcoal immersed surface of the Ti-Al system intermetallic compound
を濃化させた後、該表面を浸炭によって硬化させること
を特徴とするＴi-Ａl 系金属間化合物の表面処理方法2. Ti near the surface of the Ti-Al intermetallic compound
After concentrated the surface treatment method of the Ti-Al system intermetallic compound characterized thereby Therefore cured charcoal immersion the surface
リを接触せしめることによって該表面付近のＴi を濃化
させた後、該表面を浸炭によって硬化させることを特徴
とするＴi-Ａl 系金属間化合物の表面処理方法3. After thickening the Ti in the vicinity of the surface by brought into contact with strong alkali to the surface of the Ti-Al intermetallic compound, characterized thereby Therefore cured charcoal immersion the surface Ti- Surface treatment method for Al-based intermetallic compounds
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30809192A JP3149577B2 (en) | 1992-10-21 | 1992-10-21 | Surface treatment method of Ti-Al intermetallic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30809192A JP3149577B2 (en) | 1992-10-21 | 1992-10-21 | Surface treatment method of Ti-Al intermetallic compound |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06136507A JPH06136507A (en) | 1994-05-17 |
| JP3149577B2 true JP3149577B2 (en) | 2001-03-26 |
Family
ID=17976762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30809192A Expired - Fee Related JP3149577B2 (en) | 1992-10-21 | 1992-10-21 | Surface treatment method of Ti-Al intermetallic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3149577B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08260127A (en) * | 1995-03-20 | 1996-10-08 | Tanaka:Kk | Screw parts |
| JP2002061717A (en) * | 2000-08-17 | 2002-02-28 | Enuma Chain Seisakusho:Kk | Chain for corrosive atmosphere |
| US20060289088A1 (en) * | 2005-06-28 | 2006-12-28 | General Electric Company | Titanium treatment to minimize fretting |
| CN102560175B (en) * | 2011-12-28 | 2014-09-03 | 成都易态科技有限公司 | Method for adjusting pore diameter of metal porous material and pore structure of metal porous material |
-
1992
- 1992-10-21 JP JP30809192A patent/JP3149577B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06136507A (en) | 1994-05-17 |
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