JPH07180025A - Method for oxidizing ti-al intermetallic compound - Google Patents
Method for oxidizing ti-al intermetallic compoundInfo
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- JPH07180025A JPH07180025A JP32871693A JP32871693A JPH07180025A JP H07180025 A JPH07180025 A JP H07180025A JP 32871693 A JP32871693 A JP 32871693A JP 32871693 A JP32871693 A JP 32871693A JP H07180025 A JPH07180025 A JP H07180025A
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- Prior art keywords
- intermetallic compound
- oxidation treatment
- treatment
- temperature
- tial
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＴｉＡｌ金属間化合物の
酸化処理方法に関する。FIELD OF THE INVENTION The present invention relates to a method for oxidizing a TiAl intermetallic compound.
【０００２】[0002]
【従来の技術】Ｔｉ−Ａｌ二元系平衡状態図において、
常温における３５〜４２重量％Ａｌの組成域において、
金属間化合物ＴｉＡｌが存在し、この金属間化合物は比
重が約３．８と軽量で、かつ、１０７０Ｋまでの耐力が
４００ＭＰａ以上等の優れた力学的特性を持つため、軽
量耐熱構造材として、エンジンやタービン等への実用化
が期待されている。2. Description of the Related Art In a Ti-Al binary system equilibrium diagram,
In the composition range of 35 to 42 wt% Al at room temperature,
There is an intermetallic compound TiAl, and this intermetallic compound has a light weight with a specific gravity of about 3.8 and excellent mechanical properties such as a yield strength up to 1070K of 400 MPa or more. It is expected to be put to practical use in automobiles and turbines.
【０００３】このＴｉＡｌ金属間化合物は、他の金属間
化合物と同様に、通常の金属や合金に比べて脆く、常温
延性に乏しく、そのため比較的延性の出やすいＴｉ寄り
のＴｉＡｌ＋Ｔｉ3Ａｌ相境界に近い組成の化合物を中
心に検討が続けられており、従ってＴｉ−Ａｌ系合金の
実用組成としては、化学量論組成である３６重量％Ａｌ
よりさらにＴｉリッチな化合物に、延性または耐酸化性
を改善するためＭｎ、Ｖ、Ｓｉ、Ｎｂ、Ｃｒ、Ｍｏ等の
第３元素が添加されたものである。This TiAl intermetallic compound, like other intermetallic compounds, is more brittle than ordinary metals and alloys and has poor room temperature ductility. Therefore, at the TiAl + Ti 3 Al phase boundary closer to Ti, which is relatively prone to ductility. Studies have been continued centering on compounds having a similar composition. Therefore, as a practical composition of a Ti-Al alloy, 36 wt% Al, which is a stoichiometric composition, is used.
A third element such as Mn, V, Si, Nb, Cr or Mo is added to a compound further rich in Ti to improve ductility or oxidation resistance.
【０００４】ところで、これらＴｉ−Ａｌ系合金部材を
エンジンバルブやバルブステム等の動弁系部材として使
用しようとすると耐摩耗性の問題が出てくる。特開平３
−７５３８５号公報のＴｉＡｌ基合金製摺動部用部品の
発明においては、これらＴｉ−Ａｌ系合金をエンジンバ
ルブとして用いるには充分な耐摩耗性を具備しないこと
を指摘すると共に、Ｔｉ−Ａｌ合金部材の表面を、物理
的プロセスによる気相メッキまたはガス窒化等の処理に
よって、厚さ２〜１０μｍの窒化チタン層で被覆するこ
とにより、耐摩耗性が改善されることが開示されてい
る。By the way, when these Ti--Al alloy members are used as valve train members such as engine valves and valve stems, there arises a problem of wear resistance. JP-A-3
In the invention of the sliding portion parts made of TiAl-based alloy of JP-A-75385, it is pointed out that these Ti-Al alloys do not have sufficient wear resistance to be used as an engine valve, and at the same time, Ti-Al alloy. It is disclosed that the wear resistance is improved by coating the surface of the member with a titanium nitride layer having a thickness of 2 to 10 μm by a treatment such as vapor phase plating by a physical process or gas nitriding.
【０００５】その外に、Ｔｉ−Ａｌ系部材に酸化被膜を
形成する発明としては、特開平２−２９４４５８号公報
の発明があり、この発明では低圧酸素分圧下でＴｉを酸
化させずにＡｌだけを選択的に酸化させＡｌ2Ｏ3被膜を
形成して、Ｔｉ−Ａｌ系合金部材の酸化性を向上させた
ものであって、耐摩耗性の向上を目的とするものではな
く、酸化処理と耐摩耗性との関係は、これまでに報告が
なく不明であった。In addition, as an invention for forming an oxide film on a Ti-Al-based member, there is an invention disclosed in Japanese Patent Application Laid-Open No. 2-294458. In this invention, Ti is not oxidized under a low oxygen partial pressure and only Al is used. Is selectively oxidized to form an Al 2 O 3 film to improve the oxidizability of the Ti-Al alloy member, and is not intended to improve wear resistance, The relationship with wear resistance has not been reported so far and was unknown.
【０００６】[0006]
【発明が解決しようとする課題】一方、ＴｉＡｌ金属間
化合物の窒化処理で生成されるＴｉＮ、Ｔｉ2ＡｌＮは
高温（例えば７００℃以上と言われている。）の環境で
は不安定であり、分解しやすいと言われている。これに
対して、ＴｉＡｌの酸化物は高温でも安定であると言わ
れている。そこで、本発明ではＴｉＡｌ金属間化合物の
酸化処理方法について研究を重ね、優れた耐摩耗性を有
する酸化処理皮膜が得られるＴｉＡｌ金属間化合物の酸
化処理方法を提供することを目的とする。On the other hand, TiN and Ti 2 AlN produced by the nitriding treatment of the TiAl intermetallic compound are unstable in an environment of high temperature (for example, said to be 700 ° C. or higher) and decompose. It is said that it is easy to do. On the other hand, TiAl oxide is said to be stable even at high temperatures. Therefore, an object of the present invention is to provide an oxidation treatment method for a TiAl intermetallic compound, by which studies have been conducted on an oxidation treatment method for a TiAl intermetallic compound to obtain an oxidation treatment film having excellent wear resistance.
【０００７】[0007]
【課題を解決するための手段】発明者等は酸化処理の条
件、すなわち処理温度、処理時間、処理圧力、処理材の
Ａｌ含有量と、被処理材の耐摩耗性との関連について、
鋭意研究を重ねた。その結果これら諸要因と耐摩耗性と
の間に一定の関連のあることを見出して本発明を完成し
た。DISCLOSURE OF THE INVENTION The inventors of the present invention have found that the conditions of the oxidation treatment, that is, the treatment temperature, the treatment time, the treatment pressure, the Al content of the treated material, and the wear resistance of the treated material are as follows.
We have earnestly studied. As a result, they have found that there is a certain relationship between these factors and wear resistance, and completed the present invention.
【０００８】本発明の請求項１のＴｉＡｌ金属間化合物
の酸化処理方法は、ＴｉＡｌ金属間化合物の酸化処理法
であって、少なくとも酸素を含む雰囲気下で、 Ｔ＋５０ｌｏｇＨ≧７５０・・・・・（ａ） ５００＋２５×Ａｌ≧Ｔ・・・・・・（ｂ） 〔ここで、Ｔ：処理温度（℃）、Ｈ：処理時間（ｈ）、
Ａｌ：被処理材のＡｌ（重量％）〕なる条件下で加熱
し、酸化処理を行うことを要旨とする。The oxidation treatment method of the TiAl intermetallic compound according to claim 1 of the present invention is the oxidation treatment method of the TiAl intermetallic compound, wherein T + 50logH ≧ 750 (a) in an atmosphere containing at least oxygen. ) 500 + 25 × Al ≧ T ... (b) [where T: processing temperature (° C.), H: processing time (h),
Al: Al (% by weight of the material to be treated)] is heated and oxidized.
【０００９】本発明の請求項２のＴｉＡｌ金属間化合物
の酸化処理方法は、請求項１のＴｉＡｌ金属間化合物の
酸化処理方法において、 ２５ｌｏｇＨ＋Ｔ＋０．４Ｐ＜１１５０・・・（ｃ） 〔ここで、Ｐ：圧力（Ｔｏｒｒ）〕なる条件下で加熱
し、酸化処理を行うことを要旨とする。The oxidation treatment method for a TiAl intermetallic compound according to claim 2 of the present invention is the same as the oxidation treatment method for a TiAl intermetallic compound according to claim 1, wherein: 25logH + T + 0.4P <1150 ... (c) [where P : Pressure (Torr)] and the oxidation treatment is performed.
【００１０】本発明の対象となるチタン系合金は、Ｔｉ
3Ａｌ（α2相）とＴｉＡｌ（γ相）の両相を含んだ金属
間化合物を中心とする。ＴｉＡｌにＭｎ、Ｃｒ、Ｍｏ、
Ｓｉ等を第３元素として添加した材料にも有効である。
ＴｉＡｌのＡｌ量としては３０〜３７重量％である。こ
れ以外の組成では延性が低いため実用に適しない。The titanium-based alloy to which the present invention is applied is Ti.
3 Mainly an intermetallic compound containing both phases of Al (α 2 phase) and TiAl (γ phase). TiAl with Mn, Cr, Mo,
It is also effective for a material to which Si or the like is added as the third element.
The Al content of TiAl is 30 to 37% by weight. Other compositions have low ductility and are not suitable for practical use.
【００１１】また、本発明の対象となるＴｉＡｌ被処理
材の表面は酸化処理に先立って、脱脂および洗浄するこ
とが望ましい。ＴｉＡｌ部材の脱脂および洗浄は従来か
ら公知の手法により行うことができる。例えば、脱脂で
あればアルカリ脱脂、電解脱脂、溶剤脱脂等を用いるこ
とができる。また、洗浄後の水分・有機溶剤が残留する
と、これらが高温でＴｉＡｌ母材と反応してしまうの
で、真空で余熱をかけ、これら成分を表面から除去して
から、所定の温度まで昇温することが望ましい。Further, it is desirable that the surface of the TiAl processed material which is the object of the present invention is degreased and washed prior to the oxidation treatment. Degreasing and cleaning of the TiAl member can be performed by a conventionally known method. For example, for degreasing, alkaline degreasing, electrolytic degreasing, solvent degreasing and the like can be used. Further, if the water / organic solvent remains after cleaning, these react with the TiAl base material at a high temperature, so residual heat is applied in a vacuum to remove these components from the surface, and then the temperature is raised to a predetermined temperature. Is desirable.
【００１２】酸化処理をする雰囲気は少なくとも酸素を
含むものであって、例えば酸素または大気ガスを導入し
て行われる。The atmosphere for the oxidation treatment contains at least oxygen, and for example, oxygen or atmospheric gas is introduced.
【００１３】[0013]
【作用】（請求項１）請求項１の発明において、ＴｉＡ
ｌ金属間化合物の酸化処理条件のうち、処理時間（Ｈ）
および温度（Ｔ）の下限を（ａ）式 Ｔ＋５０ｌｏｇＨ≧７５０・・・・・（ａ） としたので、良好な酸化層が形成されると共に表面粗さ
も滑らかになり、耐摩耗性に優れた酸化皮膜を得ること
ができる。(Claim 1) In the invention of claim 1, TiA
Treatment time (H) of the conditions for the oxidation treatment of intermetallic compounds
And the lower limit of the temperature (T) is set to the formula (a) T + 50logH ≧ 750 (a), so that a good oxide layer is formed and the surface roughness becomes smooth, and oxidation with excellent wear resistance is performed. A film can be obtained.
【００１４】また、ＴｉＡｌ金属間化合物の酸化処理条
件のうち、処理時間（Ｈ）および温度（Ｔ）の上限を
（ｂ）式 ５００＋２５×Ａｌ≧Ｔ・・・・・・（ｂ） としたので、組織が変化し材料強度が低下することがな
い。Of the oxidation treatment conditions of the TiAl intermetallic compound, the upper limits of the treatment time (H) and the temperature (T) are defined by the equation (b) 500 + 25 × Al ≧ T. The structure does not change and the material strength does not decrease.
【００１５】請求項１の発明において、ＴｉＡｌ金属間
化合物の酸化処理条件のうち、処理時間（Ｈ）および温
度（Ｔ）の下限を（ａ）式としたのは、温度および処理
時間が（ａ）式を満足しないと、良好な酸化層が形成さ
れなくなると共に表面粗さも粗くなり、耐摩耗性に優れ
た酸化皮膜を得ることができないからである。In the invention of claim 1, the lower limit of the treatment time (H) and the temperature (T) of the oxidation treatment conditions of the TiAl intermetallic compound is defined as the formula (a), that is, the temperature and the treatment time (a). If the expression (4) is not satisfied, a good oxide layer will not be formed and the surface roughness will be rough, and an oxide film having excellent wear resistance cannot be obtained.
【００１６】また、ＴｉＡｌ金属間化合物の酸化処理条
件のうち、処理時間（Ｈ）および温度（Ｔ）の上限を
（ｂ）式としたのは、温度および処理時間が（ａ）式を
満足しないと、組織が変化し材料強度が低下するからで
ある。Among the oxidation treatment conditions of the TiAl intermetallic compound, the upper limits of the treatment time (H) and the temperature (T) are set to the equation (b) because the temperature and the treatment time do not satisfy the equation (a). This is because the structure changes and the material strength decreases.
【００１７】（請求項２）請求項２の発明において、Ｔ
ｉＡｌ金属間化合物の酸化処理条件のうち、圧力
（Ｐ）、処理時間（Ｈ）および温度（Ｔ）の上限を
（ｃ）式 ２５ｌｏｇＨ＋Ｔ＋０．４Ｐ＜１１５０・・・（ｃ） としたので、スケールの発生と表面の粗面化を抑制し、
良好な耐摩耗性を確保することができる。(Claim 2) In the invention of claim 2, T
Among the oxidation treatment conditions of the iAl intermetallic compound, the upper limits of the pressure (P), the treatment time (H) and the temperature (T) are set to the equation (c) 25logH + T + 0.4P <1150 ... (c). Suppress the occurrence and roughening of the surface,
Good wear resistance can be secured.
【００１８】請求項２の発明において、ＴｉＡｌ金属間
化合物の酸化処理条件のうち、圧力（Ｐ）、処理時間
（Ｈ）および温度（Ｔ）の上限を（ｃ）式としたのは、
請求項１の酸化処理条件では、表面に生成する酸化物が
表面粗さを悪くし、また表面がスケールで覆われてしま
う場合もある。そこで、さらに（ｃ）式の条件を付加す
ることにより、スケールの発生と表面の粗面化を抑制
し、良好な耐摩耗性を確保することができる。In the invention of claim 2, the upper limit of the pressure (P), the treatment time (H) and the temperature (T) in the oxidation treatment conditions of the TiAl intermetallic compound is defined by the formula (c).
Under the oxidation treatment conditions of claim 1, the oxide generated on the surface may deteriorate the surface roughness and the surface may be covered with scale. Therefore, by further adding the condition of the expression (c), it is possible to suppress the generation of scale and the roughening of the surface, and to ensure good wear resistance.
【００１９】[0019]
【実施例】本発明の実施例を比較例と対比して説明し、
本発明の効果を明らかにする。 （実施例１）Ａｌ含有量が３１重量％および３４重量％
のＴｉＡｌ合金からなる試料を脱脂・洗浄した後、真空
加熱炉に入れ１×１０-3Ｔｏｒｒの真空にした。次に、
表１に示す各温度に加熱し、圧力７６０Ｔｏｒｒの酸素
ガスを真空加熱炉に導入し、２時間の窒化処理を行っ
た。窒化処理後に各試料の引張強さを測定し、結果を表
１に示した。なお、（５００＋２５×Ａｌ重量％）℃は
３１Ａｌ重量％で１２７５℃、３４Ａｌ重量％で１３５
０℃である。EXAMPLES Examples of the present invention will be described in comparison with comparative examples,
The effect of the present invention will be clarified. (Example 1) Al content of 31% by weight and 34% by weight
After degreasing and cleaning the sample made of TiAl alloy of No. 1, it was put in a vacuum heating furnace and made a vacuum of 1 × 10 −3 Torr. next,
After heating to each temperature shown in Table 1, oxygen gas having a pressure of 760 Torr was introduced into a vacuum heating furnace, and nitriding treatment was performed for 2 hours. The tensile strength of each sample was measured after the nitriding treatment, and the results are shown in Table 1. Note that (500 + 25 × Al wt%) ° C. is 3175 wt% at 1275 ° C. and 34 Al wt% is 135 ° C.
It is 0 ° C.
【００２０】[0020]
【表１】 [Table 1]
【００２１】表１から明らかなように、処理温度が（５
００＋２５×Ａｌ重量％）℃の上限温度を越えた比較例
１および２は、組織が変化したため、引張強度が１４．
４〜１５．７ｋｇｆ／ｍｍ2と著しく低下した。これに
対して、処理温度が（５００＋２５×Ａｌ重量％）℃の
上限温度以下であった本発明の実施例１および２は本来
の引張強度が維持されることが判明し本発明の効果が確
認された。As is clear from Table 1, the treatment temperature is (5
In Comparative Examples 1 and 2 in which the upper limit temperature of (00 + 25 × Al wt%) ° C. was exceeded, the tensile strength was 14.
It was significantly reduced to 4 to 15.7 kgf / mm 2 . On the other hand, it was found that the original tensile strength was maintained in Examples 1 and 2 of the present invention in which the treatment temperature was less than or equal to the upper limit temperature of (500 + 25 × Al weight%) ° C., and the effect of the present invention was confirmed. Was done.
【００２２】（実施例２）Ａｌ含有量３４．５％のＴｉ
Ａｌ合金からなる試験片を用意し、脱脂・洗浄した後、
真空加熱炉に入れ１×１０-3Ｔｏｒｒの真空中に保持し
た。次いで、７６０Ｔｏｒｒおよび１×１０-4Ｔｏｒｒ
に保持し、図１および図２に示す各温度に図１および図
２に示す各処理時間の酸化処理を行った。(Example 2) Ti having an Al content of 34.5%
After preparing a test piece made of Al alloy, degreasing and cleaning,
It was placed in a vacuum heating furnace and kept in a vacuum of 1 × 10 −3 Torr. Then 760 Torr and 1 × 10 -4 Torr
Then, the oxidation treatment was performed at each temperature shown in FIGS. 1 and 2 for each treatment time shown in FIGS. 1 and 2.
【００２３】これら試験片について窒化処理後にＬＦＷ
摩耗試験を行った。この摩耗試験は、図３に示すよう
に、外径３５ｍｍ、内径３０ｍｍ、幅１０ｍｍの鋳鉄
（ＪＩＳＦＣ２０）製の円筒試験片を相手材とし、試験
片を接触させ接触部に常温の潤滑油を供給しつつ、回転
数５ｒｐｍ、相手材への押圧力６０ｋｇｆで３０分間摩
耗試験を行うものである。得られた結果は摩耗量が１０
０μｍを越えるものは×印、摩耗量が１０〜１００μｍ
であるものを△印、摩耗量が１０ｍｍ以下のものは○印
で、図１および図２に示した。なお、図１および図２に
示した線は共に（ａ）式を表す線である。For these test pieces, LFW was applied after nitriding treatment.
A wear test was performed. In this abrasion test, as shown in FIG. 3, a cylindrical test piece made of cast iron (JISFC20) having an outer diameter of 35 mm, an inner diameter of 30 mm, and a width of 10 mm was used as a mating member, and the test piece was brought into contact with the lubricating oil at room temperature to the contact portion. Meanwhile, the abrasion test is performed for 30 minutes at a rotation speed of 5 rpm and a pressing force of 60 kgf against the mating material. The obtained result shows that the wear amount is 10
Those with a size of more than 0 μm are marked with x, and the wear amount is 10 to 100 μm
1 and 2, the wear amount is 10 mm or less, and the mark is ○. The lines shown in FIG. 1 and FIG. 2 are lines showing the equation (a).
【００２４】図１および図２から明らかなように、
（ａ）式以上の酸化処理時間（Ｈ）および酸化処理温度
（Ｔ）である試験片は全て○印であって、摩耗量が１０
μｍ以下であって、（ａ）式を満足する酸化処理条件に
より耐摩耗性の優れた酸化処理皮膜が形成されることが
確認された。As is apparent from FIGS. 1 and 2,
All the test pieces having the oxidation treatment time (H) and the oxidation treatment temperature (T) equal to or more than the equation (a) are marked with a circle and the wear amount was 10
It was confirmed that an oxidation treatment film having excellent wear resistance was formed under the oxidation treatment condition of not more than μm and satisfying the expression (a).
【００２５】（実施例３）Ａｌ含有量３４．５％のＴｉ
Ａｌ合金からなる試験片を用意し、脱脂・洗浄した後、
真空加熱炉に入れ１×１０-3Ｔｏｒｒの真空中に保持し
た。次いで、７６０Ｔｏｒｒおよび１×１０-4Ｔｏｒｒ
に保持し、図４、図５および図６に示す各温度に図４、
図５および図６に示す各処理時間の酸化処理を行った。
また、処理時間を１時間と一定として図６に示す各圧力
と処理時間の酸化処理を行った。(Example 3) Ti having an Al content of 34.5%
After preparing a test piece made of Al alloy, degreasing and cleaning,
It was placed in a vacuum heating furnace and kept in a vacuum of 1 × 10 −3 Torr. Then 760 Torr and 1 × 10 -4 Torr
4, and at each temperature shown in FIG. 4, FIG. 5 and FIG.
Oxidation treatment was performed for each treatment time shown in FIGS. 5 and 6.
Further, the oxidation treatment was carried out at the respective pressures and treatment times shown in FIG. 6 with the treatment time being constant at 1 hour.
【００２６】これら試験片について酸化処理後に実施例
２と同様のＬＦＷ摩耗試験を行った。得られた結果は摩
耗量が１００μｍを越えるものは×印、摩耗量が１０〜
１００μｍであるものを△印、摩耗量が１０ｍｍ以下の
ものは○印で図１および図２に示した。なお、図４およ
び図５に示した線は共に（ｃ）式を表す線である。These test pieces were subjected to the same LFW abrasion test as in Example 2 after the oxidation treatment. The result obtained is x when the wear amount exceeds 100 μm, and the wear amount is 10 to 10.
Those having a thickness of 100 μm are shown by Δ, and those having a wear amount of 10 mm or less are shown by O, which are shown in FIGS. The lines shown in FIG. 4 and FIG. 5 are lines showing the equation (c).
【００２７】図４、図５および図６から明らかなよう
に、（ｃ）式以下の酸化処理圧力（Ｐ）、酸化処理時間
（Ｈ）および酸化処理温度（Ｔ）である試験片は全て○
印であって、摩耗量が１０μｍ以下であって、（Ｃ）式
を満足する酸化処理条件により耐摩耗性の優れた酸化処
理皮膜が形成されることが確認された。As is apparent from FIGS. 4, 5 and 6, all the test pieces having the oxidation treatment pressure (P), the oxidation treatment time (H) and the oxidation treatment temperature (T) of the formula (c) or less are ◯.
It was confirmed that the wear amount was 10 μm or less and the oxidation-treated film having excellent wear resistance was formed under the oxidation treatment conditions satisfying the expression (C).
【００２８】[0028]
【発明の効果】本発明の請求項１のＴｉＡｌ金属間化合
物の酸化処理方法は以上詳述したように、少なくとも酸
素を含む雰囲気下で、Ｔ＋５０ｌｏｇＨ≧７５０・・・
・・（ａ）式および５００＋２５×Ａｌ≧Ｔ・・・・・
・（ｂ）式〔ここで、Ｔ：処理温度（℃）、Ｈ：処理時
間（ｈ）、Ａｌ：被処理材のＡｌ（重量％）〕なる条件
下で加熱し、酸化処理を行うことを特徴とし、さらに請
求項２のＴｉＡｌ金属間化合物の酸化処理方法は請求項
１のＴｉＡｌ金属間化合物の酸化処理方法において、２
５ｌｏｇＨ＋Ｔ＋０．４Ｐ＜１１５０・・・（ｃ）式
〔ここで、Ｐ：圧力（Ｔｏｒｒ）〕なる条件下で加熱
し、酸化処理を行うことを特徴とするものであって、Ｔ
ｉＡｌ金属間化合物の表面に耐摩耗性に優れた酸化皮膜
を得ることができる。As described in detail above, the method for oxidizing a TiAl intermetallic compound according to claim 1 of the present invention is T + 50logH ≧ 750 ... In an atmosphere containing at least oxygen.
..Formula (a) and 500 + 25 × Al ≧ T ...
· Heating under the conditions of the formula (b) [where T is the treatment temperature (° C.), H is the treatment time (h), and Al is the Al (% by weight) of the material to be treated] to perform the oxidation treatment. Further, the oxidation treatment method of the TiAl intermetallic compound according to claim 2 is the same as the oxidation treatment method of the TiAl intermetallic compound according to claim 1.
5logH + T + 0.4P <1150 (c) [wherein P: pressure (Torr)], and the oxidation treatment is performed under the condition of:
An oxide film having excellent wear resistance can be obtained on the surface of the iAl intermetallic compound.
【図１】圧力７６０Ｔｏｒｒにおける種々の処理時間お
よび処理温度で酸化処理した試験片の摩耗量および式
（ａ）を示す直線を表す線図である。FIG. 1 is a diagram showing a straight line showing a wear amount and a formula (a) of a test piece subjected to an oxidation treatment at various treatment times and temperatures at a pressure of 760 Torr.
【図２】圧力１×１０-4ＴｏｒｒＴｏｒｒにおける種々
の処理時間および処理温度で酸化処理した試験片の摩耗
量および式（ａ）を示す直線を表す線図である。FIG. 2 is a diagram showing a straight line showing a wear amount and a formula (a) of a test piece subjected to an oxidation treatment at various treatment times and treatment temperatures under a pressure of 1 × 10 −4 Torr Torr.
【図３】耐摩耗試験片および相手材の側面図である。FIG. 3 is a side view of an abrasion resistance test piece and a mating member.
【図４】圧力７６０Ｔｏｒｒにおける種々の処理時間お
よび処理温度で酸化処理した試験片の摩耗量および式
（ｃ）を示す直線を表す線図である。FIG. 4 is a diagram showing a straight line showing the amount of wear of a test piece subjected to an oxidation treatment at various treatment times and treatment temperatures at a pressure of 760 Torr and the equation (c).
【図５】圧力１×１０-4Ｔｏｒｒにおける種々の処理時
間および処理温度で酸化処理した試験片の摩耗量および
式（ｃ）を示す直線を表す線図である。FIG. 5 is a diagram showing a straight line showing the wear amount and the formula (c) of a test piece subjected to an oxidation treatment at various treatment times and treatment temperatures under a pressure of 1 × 10 −4 Torr.
【図６】処理時間Ｔ＝１時間における種々の処理圧力お
よび処理温度で酸化処理した試験片の摩耗量および式
（ｃ）を示す直線を表す線図である。FIG. 6 is a diagram showing a straight line showing the amount of wear of a test piece subjected to an oxidation treatment at various treatment pressures and treatment temperatures and a formula (c) at a treatment time T = 1 hour.
Claims (2)
って、少なくとも酸素を含む雰囲気下で、 Ｔ＋５０ｌｏｇＨ≧７５０・・・・・（ａ） ５００＋２５×Ａｌ≧Ｔ・・・・・・（ｂ） 〔ここで、Ｔ：処理温度（℃）、Ｈ：処理時間（ｈ）、
Ａｌ：被処理材のＡｌ（重量％）〕なる条件下で加熱
し、酸化処理を行うことを特徴とするＴｉＡｌ金属間化
合物の酸化処理方法。1. A method of oxidizing a TiAl intermetallic compound, wherein T + 50 log H ≧ 750 ... (a) 500 + 25 × Al ≧ T .. (b) in an atmosphere containing at least oxygen. [Where T: processing temperature (° C.), H: processing time (h),
Al: Al (wt%) of the material to be treated], and the oxidation treatment method of the TiAl intermetallic compound is characterized by performing the oxidation treatment.
処理方法において、 ２５ｌｏｇＨ＋Ｔ＋０．４Ｐ＜１１５０・・・（ｃ） 〔ここで、Ｔ：処理温度（℃）、Ｈ：処理時間（ｈ）、
Ｐ：圧力（Ｔｏｒｒ）〕なる条件下で加熱し、酸化処理
を行うことを特徴とするＴｉＡｌ金属間化合物の酸化処
理方法。2. The oxidation treatment method for a TiAl intermetallic compound according to claim 1, wherein 25logH + T + 0.4P <1150 ... (c) [where T: treatment temperature (° C.), H: treatment time (h),
P: pressure (Torr)], and the oxidation treatment method of the TiAl intermetallic compound is characterized by performing the oxidation treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05328716A JP3077867B2 (en) | 1993-12-24 | 1993-12-24 | Method of oxidizing TiAl intermetallic compound for sliding member with excellent wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05328716A JP3077867B2 (en) | 1993-12-24 | 1993-12-24 | Method of oxidizing TiAl intermetallic compound for sliding member with excellent wear resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07180025A true JPH07180025A (en) | 1995-07-18 |
| JP3077867B2 JP3077867B2 (en) | 2000-08-21 |
Family
ID=18213389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05328716A Expired - Fee Related JP3077867B2 (en) | 1993-12-24 | 1993-12-24 | Method of oxidizing TiAl intermetallic compound for sliding member with excellent wear resistance |
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| Country | Link |
|---|---|
| JP (1) | JP3077867B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004007788A1 (en) * | 2002-07-16 | 2004-01-22 | The Boc Group Plc | Method of case hardening titanium and zirconium alloys |
| CN106834992A (en) * | 2015-12-04 | 2017-06-13 | 中航商用航空发动机有限责任公司 | TiAl alloy casting and its handling process |
-
1993
- 1993-12-24 JP JP05328716A patent/JP3077867B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004007788A1 (en) * | 2002-07-16 | 2004-01-22 | The Boc Group Plc | Method of case hardening titanium and zirconium alloys |
| US7208055B2 (en) | 2002-07-16 | 2007-04-24 | The Boc Group, Plc | Thermal Treatment Method |
| CN106834992A (en) * | 2015-12-04 | 2017-06-13 | 中航商用航空发动机有限责任公司 | TiAl alloy casting and its handling process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3077867B2 (en) | 2000-08-21 |
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