JPH06269927A - Method for working titanium aluminide - Google Patents
Method for working titanium aluminideInfo
- Publication number
- JPH06269927A JPH06269927A JP5060709A JP6070993A JPH06269927A JP H06269927 A JPH06269927 A JP H06269927A JP 5060709 A JP5060709 A JP 5060709A JP 6070993 A JP6070993 A JP 6070993A JP H06269927 A JPH06269927 A JP H06269927A
- Authority
- JP
- Japan
- Prior art keywords
- titanium aluminide
- casting
- milling
- acid solution
- mixed acid
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はチタンアルミナイドを目
的の形状に成形するための加工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 processing method for forming titanium aluminide into a desired shape.
【０００２】[0002]
【従来の技術】チタンアルミナイド（チタンとアルミニ
ウムの金属間化合物）は軽量でありながら剛性と特に耐
熱性に優れたもので、将来的に多種多様の構造用部品に
適用できる材料として注目されている。2. Description of the Related Art Titanium aluminide (an intermetallic compound of titanium and aluminum) is lightweight and excellent in rigidity and heat resistance, and is attracting attention as a material applicable to various structural parts in the future. .
【０００３】[0003]
【発明が解決しようとする課題】しかし、チタンアルミ
ナイドは常温で延性が低く、非常に成形性が悪いもので
ある。特に、精密鋳造などで薄肉な成形品を製造するこ
とは非常に困難であり、また切削加工することも困難で
あることから、加工コストが嵩むばかりでなく、加工す
る形状に制約があることから用途が限定されているもの
であった。However, titanium aluminide has a low ductility at room temperature and has a very poor formability. In particular, it is extremely difficult to manufacture thin-walled molded products by precision casting, etc., and it is also difficult to cut, so not only the processing cost increases, but also the shape to be processed is restricted. It was of limited use.
【０００４】本発明は前記課題を解決するためになされ
たもので、薄肉なものを含む多様な形状に成形すること
を可能とするチタンアルミナイドの加工方法を提供する
ものである。The present invention has been made in order to solve the above problems, and provides a method for processing titanium aluminide that enables molding into various shapes including thin ones.
【０００５】[0005]
【課題を解決するための手段】本発明のチタンアルミナ
イドの加工方法は、目的とする成形品よりも大きく且つ
その相似形状の内部空間を有する鋳型にてチタンアルミ
ナイドを鋳造し、得られた鋳造物を硝酸とフッ化水素酸
を含有する混酸溶液で浸食加工して成形品を得ることを
特徴とするものである。The method for processing titanium aluminide according to the present invention is a casting obtained by casting titanium aluminide in a mold having an internal space that is larger than the target molded article and has a similar shape. It is characterized in that a molded product is obtained by eroding a mixed acid solution containing nitric acid and hydrofluoric acid.
【０００６】[0006]
【作用】本発明によれば、鋳造および切削加工の困難な
チタンアルミナイドを加工する場合、簡易な鋳造工程に
加えて化学処理工程を施すもので、従来では加工困難で
あった形状の成形品を容易に得ることができる。鋳造工
程では、目的とする成形品よりも若干大きい鋳造物を鋳
造し、その後、化学処理工程で、少なくとも硝酸とフッ
化水素酸を含有する混酸溶液で鋳造物を浸食加工して成
形品を得る。According to the present invention, when titanium aluminide, which is difficult to cast and cut, is processed, a chemical treatment step is performed in addition to a simple casting step. Can be easily obtained. In the casting process, a cast product that is slightly larger than the target molded product is cast, and then in the chemical treatment process, the cast product is eroded with a mixed acid solution containing at least nitric acid and hydrofluoric acid to obtain a molded product. .
【０００７】[0007]
【実施例】本発明の一実施例としてジェットエンジンの
低圧タービンブレードの加工例を示す。まず、目的とす
るタービンブレードと相似形状であって、かつ若干量厚
みの大きい内部空間を有する鋳型を用意する。その内部
空間の大きさは本実施例の場合、目的とする成形品より
も１.０〜２.５mmの余肉が鋳造物の表面に形成される大
きさのものとする。次に図１（ａ）のように、加熱して
溶融したチタンアルミナイド１４をこの鋳型１０の内部
空間１２内に注入し、鋳造する。チタンアルミナイドが
鋳型１０の内部空間１２に沿った形状で冷却固化した
後、その鋳造物を鋳型から取り出し、図１（ｂ）のよう
に混酸溶液１６中に浸漬し、鋳造物１８の表面を浸食
（以下、ミーリングと称する）して余肉を除去する。浸
漬中は混酸溶液１６を攪拌したり、鋳造物１８を回転さ
せることが望ましい。混酸溶液は少なくとも硝酸とフッ
化水素酸を含有する溶液で、硝酸が１５０〜２００g/
l、フッ化水素酸が８０〜１１０g/lのものが望ましい。
また、混酸溶液にさらに重クロム酸ナトリウムを添加す
ることで、ミーリング速度を調整することができる。ま
た、混酸溶液にリン酸を添加することで、チタンアルミ
ナイドの表面の粗さを改善することができる。鋳造物の
混酸溶液でのミーリング速度を制御する（ミーリング速
度は５〜１０μm／minが適している）ために、混酸溶液
の液温は２０〜４０℃が好ましい。チタンアルミナイド
のミーリング速度は予め調整しておくことができるの
で、鋳造物が所望の成形品の大きさまでミーリングされ
たところでその鋳造物を混酸溶液から引き揚げ、所望の
形状と大きさを有する成形品２０（図１（ｃ）参照）を
得る。EXAMPLE An example of processing a low-pressure turbine blade of a jet engine will be shown as an example of the present invention. First, a mold having an internal space having a similar shape to a target turbine blade and having a slightly large thickness is prepared. In the present embodiment, the size of the internal space is such that a surplus of 1.0 to 2.5 mm larger than that of the target molded product is formed on the surface of the casting. Next, as shown in FIG. 1A, the titanium aluminide 14 that has been heated and melted is poured into the internal space 12 of the mold 10 and cast. After the titanium aluminide is cooled and solidified in a shape along the inner space 12 of the mold 10, the cast product is taken out of the mold and immersed in the mixed acid solution 16 as shown in FIG. 1B to erode the surface of the cast product 18. (Hereinafter referred to as milling) to remove excess meat. It is desirable to stir the mixed acid solution 16 or rotate the casting 18 during the immersion. The mixed acid solution is a solution containing at least nitric acid and hydrofluoric acid, and the nitric acid is 150 to 200 g /
l and hydrofluoric acid of 80 to 110 g / l are desirable.
In addition, the milling rate can be adjusted by further adding sodium dichromate to the mixed acid solution. Moreover, the surface roughness of titanium aluminide can be improved by adding phosphoric acid to the mixed acid solution. The liquid temperature of the mixed acid solution is preferably 20 to 40 ° C. in order to control the milling speed of the casting in the mixed acid solution (the milling speed is preferably 5 to 10 μm / min). Since the milling speed of the titanium aluminide can be adjusted in advance, when the cast product is milled to the size of the desired molded product, the cast product is lifted from the mixed acid solution and the molded product 20 having the desired shape and size is obtained. (See FIG. 1C).
【０００８】本実施例の方法によれば、特定の溶液であ
る混酸溶液を使用して化学的にチタンアルミナイドを加
工するので、薄肉の成形品を製造する場合であって鋳造
や切削では加工困難なものであっても、容易に成形する
ことができる。また、化学処理を利用するものであるか
ら、成形品に不要な応力が残留することがない。さらに
また、化学処理による金属加工では、一般に加工速度は
遅いとされているが、本発明では鋳造工程を併用するも
のなので、加工時間の増加は問題にならない程度であ
る。また、ミーリング時に、鋳造物にマスキングを施し
ておくことで部分的にミーリングを行なうこともでき、
加工自由度を高めることができる。According to the method of this embodiment, the titanium aluminide is chemically processed by using a mixed acid solution which is a specific solution. Therefore, it is difficult to process the titanium aluminide by casting or cutting when producing a thin molded product. No matter what, it can be easily molded. Further, since the chemical treatment is used, unnecessary stress does not remain in the molded product. Furthermore, in metal working by chemical treatment, the working speed is generally considered to be slow, but since the present invention uses a casting process together, an increase in working time is not a problem. In addition, at the time of milling, it is possible to partially perform milling by masking the casting.
The processing flexibility can be increased.
【０００９】〔試験１〕硝酸およびフッ化水素酸の濃度
の異なる各種混酸溶液を用いてチタンアルミナイドのイ
ンゴットをミーリングし、そのミーリング速度を測定し
た。尚、ミーリング時間は３０分とした。表１に各混酸
溶液の組成および溶液温度と、ミーリング速度の測定結
果を示す。また、測定結果は図２にも示した。[Test 1] A titanium aluminide ingot was milled using various mixed acid solutions having different concentrations of nitric acid and hydrofluoric acid, and the milling rate was measured. The milling time was 30 minutes. Table 1 shows the composition and temperature of each mixed acid solution, and the measurement results of the milling speed. The measurement results are also shown in FIG.
【００１０】[0010]
【表１】 [Table 1]
【００１１】表１及び図２から、フッ化水素酸（ＨＦ）
濃度が高くなるにつれてミーリング速度が速くなること
がわかる。また、硝酸（ＨＮＯ3）濃度はミーリング速
度にあまり影響しないことがわかる。また、ミーリング
後のサンプルを観察したところ、フッ化水素酸濃度が高
くなるにつれて脆化傾向があることが認められた。From Table 1 and FIG. 2, hydrofluoric acid (HF)
It can be seen that the milling speed increases as the concentration increases. Further, it can be seen that the nitric acid (HNO 3 ) concentration has little effect on the milling rate. In addition, when the sample after milling was observed, it was found that there was a tendency for embrittlement as the concentration of hydrofluoric acid increased.
【００１２】〔試験２〕混酸溶液の液温を変えて、試験
１と同様にミーリング速度を測定した。測定結果を表２
及び図３に示す。尚、図３においては、（−○−○−）
で示した。[Test 2] The milling speed was measured in the same manner as in Test 1 by changing the liquid temperature of the mixed acid solution. Table 2 shows the measurement results
And shown in FIG. In addition, in FIG. 3, (-○-○-)
Indicated by.
【００１３】[0013]
【表２】 [Table 2]
【００１４】表２及び図３から、液温が高くなるにつれ
てミーリング速度が速くなることがわかる。From Table 2 and FIG. 3, it can be seen that the milling speed increases as the liquid temperature increases.
【００１５】〔試験３〕混酸溶液に重クロム酸ナトリウ
ム（Ｎａ2Ｃｒ2Ｏ7）を添加して、ミーリング速度を測
定した。測定結果を表３及び図４に示す。[Test 3] Sodium dichromate (Na 2 Cr 2 O 7 ) was added to the mixed acid solution to measure the milling rate. The measurement results are shown in Table 3 and FIG.
【００１６】[0016]
【表３】 [Table 3]
【００１７】表３及び図４から、重クロム酸ナトリウム
を添加することでミーリング速度を抑制できることがわ
かる。From Table 3 and FIG. 4, it can be seen that the milling rate can be suppressed by adding sodium dichromate.
【００１８】〔試験４〕同様に、混酸溶液にリン酸（Ｈ
3ＰＯ4）を添加し且つ液温を変化させて、ミーリング速
度を測定した。測定結果を表４及び図３に示す。尚、図
３中、サンプル１２〜１５は（−△−△−）で示した。[Test 4] Similarly, phosphoric acid (H
3 PO 4 ) was added and the liquid temperature was changed to measure the milling rate. The measurement results are shown in Table 4 and FIG. In addition, in FIG. 3, samples 12 to 15 are indicated by (-Δ-Δ-).
【００１９】[0019]
【表４】 [Table 4]
【００２０】表２及び表４、図３から、リン酸を添加し
てもミーリング速度に変化は生じていないことがわか
る。しかしながら、ミーリング後にサンプルを観察した
ところ、リン酸の添加された混酸溶液によるものは表面
粗さが若干改善されていた。From Tables 2 and 4 and FIG. 3, it can be seen that the milling speed did not change even if phosphoric acid was added. However, when the sample was observed after milling, the surface roughness of the mixed acid solution containing phosphoric acid was slightly improved.
【００２１】以上、試験１〜４から、混酸溶液として、
硝酸が１５０〜２００g/l、フッ化水素酸が８０〜１１
０g/l、液温が２０〜４０℃のものを使用することで、
ミーリング速度を５〜１０μm／minにすることができ、
望ましいことがわかる。As described above, from Tests 1 to 4, as a mixed acid solution,
150-200g / l nitric acid, 80-11 hydrofluoric acid
By using 0 g / l and a liquid temperature of 20-40 ° C,
The milling speed can be 5 ~ 10μm / min,
I find it desirable.
【００２２】[0022]
【発明の効果】本発明は、チタンアルミナイドの加工方
法において、鋳造工程と化学処理工程からなるもので、
鋳造後に、特定の溶液である混酸溶液を使用して化学的
にチタンアルミナイドを加工するもので、薄肉の成形品
を製造する場合でも、また鋳造や切削では加工困難なも
のでも、容易に成形することができる。また、化学処理
を利用するものであるから、成形品に残留する不要な応
力を抑制できる。したがって、本発明はチタンアルミナ
イドの加工コストを低減することができるばかりでな
く、チタンアルミナイドの用途の拡大に寄与するもので
ある。The present invention is a method for processing titanium aluminide, which comprises a casting step and a chemical treatment step.
After casting, the titanium aluminide is chemically processed using a mixed acid solution that is a specific solution.Even when manufacturing thin-walled molded products, or when it is difficult to process by casting or cutting, it is easily molded. be able to. Further, since the chemical treatment is used, unnecessary stress remaining in the molded product can be suppressed. Therefore, the present invention can not only reduce the processing cost of titanium aluminide, but also contribute to the expansion of applications of titanium aluminide.
【図１】本実施例の加工方法を示す工程図である。FIG. 1 is a process drawing showing the processing method of the present embodiment.
【図２】フッ化水素酸濃度および硝酸濃度と、ミーリン
グ速度の関係を示すグラフである。FIG. 2 is a graph showing the relationship between hydrofluoric acid concentration and nitric acid concentration, and milling speed.
【図３】混酸溶液の液温およびリン酸の添加と、ミーリ
ング速度の関係を示すグラフである。FIG. 3 is a graph showing the relationship between the milling speed and the liquid temperature of a mixed acid solution and the addition of phosphoric acid.
【図４】重クロム酸ナトリウムとミーリング速度の関係
を示すグラフである。FIG. 4 is a graph showing the relationship between sodium dichromate and milling speed.
１０ 鋳型 １２ 内部空間 １４ チタンアルミナイド １６ 混酸溶液 １８ 鋳造物 ２０ 成形品 10 Mold 12 Internal Space 14 Titanium Aluminide 16 Mixed Acid Solution 18 Casting 20 Molded Product
Claims (1)
相似形状の内部空間を有する鋳型にてチタンアルミナイ
ドを鋳造し、得られた鋳造物を硝酸とフッ化水素酸を含
有する混酸溶液で浸食加工して成形品を得ることを特徴
とするチタンアルミナイドの加工方法。1. A titanium aluminide is cast in a mold having an internal space of a similar shape and larger than a target molded article, and the cast obtained is eroded by a mixed acid solution containing nitric acid and hydrofluoric acid. A method of processing a titanium aluminide, which comprises processing to obtain a molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06070993A JP3146731B2 (en) | 1993-03-19 | 1993-03-19 | Processing method of titanium aluminide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06070993A JP3146731B2 (en) | 1993-03-19 | 1993-03-19 | Processing method of titanium aluminide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06269927A true JPH06269927A (en) | 1994-09-27 |
| JP3146731B2 JP3146731B2 (en) | 2001-03-19 |
Family
ID=13150093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06070993A Expired - Lifetime JP3146731B2 (en) | 1993-03-19 | 1993-03-19 | Processing method of titanium aluminide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3146731B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6294132B1 (en) * | 1996-10-28 | 2001-09-25 | Mitsubishi Heavy Industries Ltd. | TiAl intermetallic compound-based alloy |
| US8858697B2 (en) | 2011-10-28 | 2014-10-14 | General Electric Company | Mold compositions |
| US8906292B2 (en) | 2012-07-27 | 2014-12-09 | General Electric Company | Crucible and facecoat compositions |
| US8932518B2 (en) | 2012-02-29 | 2015-01-13 | General Electric Company | Mold and facecoat compositions |
| US8992824B2 (en) | 2012-12-04 | 2015-03-31 | General Electric Company | Crucible and extrinsic facecoat compositions |
| US9011205B2 (en) | 2012-02-15 | 2015-04-21 | General Electric Company | Titanium aluminide article with improved surface finish |
| US9192983B2 (en) | 2013-11-26 | 2015-11-24 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9481934B2 (en) | 2012-05-09 | 2016-11-01 | Mitsubishi Heavy Industries Aero Engines, Ltd. | Method of removing work-affected layer |
| US9511417B2 (en) | 2013-11-26 | 2016-12-06 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9592548B2 (en) | 2013-01-29 | 2017-03-14 | General Electric Company | Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US10391547B2 (en) | 2014-06-04 | 2019-08-27 | General Electric Company | Casting mold of grading with silicon carbide |
-
1993
- 1993-03-19 JP JP06070993A patent/JP3146731B2/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6294132B1 (en) * | 1996-10-28 | 2001-09-25 | Mitsubishi Heavy Industries Ltd. | TiAl intermetallic compound-based alloy |
| US8858697B2 (en) | 2011-10-28 | 2014-10-14 | General Electric Company | Mold compositions |
| US9011205B2 (en) | 2012-02-15 | 2015-04-21 | General Electric Company | Titanium aluminide article with improved surface finish |
| US8932518B2 (en) | 2012-02-29 | 2015-01-13 | General Electric Company | Mold and facecoat compositions |
| US9802243B2 (en) | 2012-02-29 | 2017-10-31 | General Electric Company | Methods for casting titanium and titanium aluminide alloys |
| US9481934B2 (en) | 2012-05-09 | 2016-11-01 | Mitsubishi Heavy Industries Aero Engines, Ltd. | Method of removing work-affected layer |
| US8906292B2 (en) | 2012-07-27 | 2014-12-09 | General Electric Company | Crucible and facecoat compositions |
| US8992824B2 (en) | 2012-12-04 | 2015-03-31 | General Electric Company | Crucible and extrinsic facecoat compositions |
| US9803923B2 (en) | 2012-12-04 | 2017-10-31 | General Electric Company | Crucible and extrinsic facecoat compositions and methods for melting titanium and titanium aluminide alloys |
| US9592548B2 (en) | 2013-01-29 | 2017-03-14 | General Electric Company | Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9511417B2 (en) | 2013-11-26 | 2016-12-06 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9192983B2 (en) | 2013-11-26 | 2015-11-24 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US10391547B2 (en) | 2014-06-04 | 2019-08-27 | General Electric Company | Casting mold of grading with silicon carbide |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3146731B2 (en) | 2001-03-19 |
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