JP2762886B2 - Method for producing Nb-Al intermetallic compound - Google Patents
Method for producing Nb-Al intermetallic compoundInfo
- Publication number
- JP2762886B2 JP2762886B2 JP824293A JP824293A JP2762886B2 JP 2762886 B2 JP2762886 B2 JP 2762886B2 JP 824293 A JP824293 A JP 824293A JP 824293 A JP824293 A JP 824293A JP 2762886 B2 JP2762886 B2 JP 2762886B2
- Authority
- JP
- Japan
- Prior art keywords
- intermetallic compound
- producing
- solidification
- present
- less
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明はＮｂ（ニオブ）−Ａｌ
（アルミニウム）金属間化合物の製造方法に係り、特
に、超高温耐熱材料として有用なＮｂ−Ａｌ金属間化合
物の製造に当り、溶湯の凝固直後に所定の熱処理を施す
ことにより、凝固時の熱応力を緩和し、凝固割れを防止
するＮｂ−Ａｌ金属間化合物の製造方法に関する。The present invention relates to Nb (niobium) -Al
The present invention relates to a method for producing an (aluminum) intermetallic compound, and in particular, in producing an Nb-Al intermetallic compound useful as an ultra-high-temperature heat-resistant material, by subjecting a predetermined heat treatment immediately after solidification of a molten metal to thermal stress during solidification. The present invention relates to a method for producing an Nb-Al intermetallic compound which alleviates cracking and prevents solidification cracking.
【０００２】[0002]
【従来の技術】Ｎｂ−Ａｌ金属間化合物は、１５００℃
以上の高温での相安定性、高温強度、耐酸化性等の優れ
た特性を有し、超高温構造材としての用途が期待されて
いる。Ｎｂ−Ａｌ金属間化合物としては従来、Ｎｂ3 Ａ
ｌ，Ｎｂ2 Ａｌ及びＡｌ3 Ｎｂが存在することが知られ
ているが、その状態図や特性等の詳細についての十分な
検討はなされていない。2. Description of the Related Art Nb-Al intermetallic compound is 1500 ° C.
It has excellent properties such as phase stability at high temperatures, high temperature strength, and oxidation resistance, and is expected to be used as an ultra-high temperature structural material. As an Nb-Al intermetallic compound, Nb 3 A
It is known that l, Nb 2 Al and Al 3 Nb exist, but no sufficient study has been made on the details such as phase diagrams and characteristics.
【０００３】[0003]
【発明が解決しようとする課題】Ｎｂ−Ａｌ金属間化合
物は、１５００℃以上の高温強度等に優れるなどの特長
を有する反面、１０００℃以下で非常に脆く、鋳造凝固
時の熱応力により凝固割れが発生するという欠点があっ
た。The Nb-Al intermetallic compound has features such as excellent high-temperature strength of 1500 ° C. or higher, but is very brittle at 1000 ° C. or lower and solidification cracking due to thermal stress during casting solidification. However, there is a drawback that the problem occurs.
【０００４】本発明は上記従来の問題点を解決し、Ｎｂ
−Ａｌ金属間化合物の製造に当り、凝固時の熱応力を緩
和して、凝固割れを低減するＮｂ−Ａｌ金属間化合物の
製造方法を提供することを目的とする。[0004] The present invention solves the above-mentioned conventional problems and provides Nb
An object of the present invention is to provide a method for producing an Nb-Al intermetallic compound that reduces thermal stress during solidification and reduces solidification cracking in producing an Al intermetallic compound.
【０００５】[0005]
【課題を解決するための手段】本発明のＮｂ−Ａｌ金属
間化合物の製造方法は、Ｎｂ７５〜８１原子％及びＡｌ
１９〜２５原子％を含んでなる合金溶湯を凝固させるＮ
ｂ−Ａｌ金属間化合物の製造方法において、前記溶湯が
凝固した直後の１０分以上の間１０００〜１５００℃に
保持し、その後、１００℃／ｍｉｎ以下の冷却速度で冷
却することを特徴とする。（なお、以下において「原子
％」は「ａｔ％」と記載する。）以下に本発明を詳細に
説明する。The method for producing an Nb-Al intermetallic compound according to the present invention comprises the steps of:
N to solidify molten alloy containing 19 to 25 atomic%
The method for producing a b-Al intermetallic compound is characterized in that the molten metal is kept at 1000 to 1500 ° C. for 10 minutes or more immediately after solidification, and then cooled at a cooling rate of 100 ° C./min or less. (Hereinafter, “atomic%” is described as “at%”.) The present invention will be described in detail below.
【０００６】本発明において、合金溶湯のＮｂ含有量が
７５ａｔ％未満で、Ａｌ含有量が２５ａｔ％を超えると
得られる金属間化合物が脆くなり、逆に、Ｎｂ含有量が
８１ａｔ％を超えＡｌ含有量が１９ａｔ％未満であると
得られる金属間化合物の強度が低下する。従って、Ｎｂ
は７５〜８１ａｔ％、Ａｌは１９〜２５ａｔ％とする。In the present invention, when the Nb content of the molten alloy is less than 75 at% and the Al content exceeds 25 at%, the obtained intermetallic compound becomes brittle, and conversely, the Nb content exceeds 81 at% and the Al content increases. If the amount is less than 19 at%, the strength of the obtained intermetallic compound will decrease. Therefore, Nb
Is 75 to 81 at%, and Al is 19 to 25 at%.
【０００７】本発明においては、このような組成となる
ようにＮｂ及びＡｌをアーク溶解、プラズマアーク溶
解、電子ビーム溶解、高周波誘導スカル溶解等で溶解し
て得られた金属溶湯を凝固させた直後、１０分以上の
間、好ましくは３０〜６０分間１０００〜１５００℃に
保持した後、１００℃／ｍｉｎ以下、好ましくは５０〜
８０℃／ｍｉｎの冷却速度で冷却する。ここで合金溶湯
の凝固直後の保持温度が１５００℃を超えると結晶粒の
粗大化が起こり、１０００℃未満では十分な凝固応力の
緩和が図れない。また、金属溶湯の凝固直後１０００〜
１５００℃に保持する時間が１０分未満であると、十分
な凝固応力の除去が行なえず、凝固割れを防止し得な
い。この保持時間は長過ぎても生産効率の面で好ましく
ないことから、望ましくは３０〜６０分とする。In the present invention, immediately after solidifying a molten metal obtained by melting Nb and Al by arc melting, plasma arc melting, electron beam melting, high frequency induction skull melting or the like so as to have such a composition. After holding at 1000 to 1500 ° C. for 10 minutes or more, preferably 30 to 60 minutes, 100 ° C./min or less, preferably 50 to
Cool at a cooling rate of 80 ° C./min. Here, if the holding temperature immediately after solidification of the molten alloy exceeds 1500 ° C., the crystal grains become coarse, and if it is less than 1000 ° C., sufficient relaxation of solidification stress cannot be achieved. Immediately after the solidification of the molten metal,
If the holding time at 1500 ° C. is less than 10 minutes, sufficient solidification stress cannot be removed and solidification cracking cannot be prevented. If the holding time is too long, it is not preferable in terms of production efficiency, so that the holding time is desirably 30 to 60 minutes.
【０００８】更に、その後の冷却速度が１００℃／ｍｉ
ｎを超えると冷却時の熱応力が大きく、凝固割れの原因
となる。この冷却速度はあまりに遅過ぎると生産効率の
面で好ましくないことから、望ましくは５０〜１００℃
／ｍｉｎとする。Further, the cooling rate after that is 100 ° C./mi
If it exceeds n, the thermal stress during cooling will be large, causing solidification cracking. If the cooling rate is too slow, it is not preferable in terms of production efficiency.
/ Min.
【０００９】[0009]
【作用】合金溶湯の凝固直後に１０００〜１５００℃で
１０分以上保持することにより鋳造時の凝固応力が緩和
される。また、その後、１００℃／ｍｉｎ以下でゆっく
りと冷却することにより、冷却時の熱応力が小さくな
り、上記凝固応力の緩和との相乗効果で凝固割れは確実
に防止される。The solidification stress during casting is alleviated by holding the alloy at 1000 to 1500 ° C. for 10 minutes or more immediately after solidification of the molten alloy. Thereafter, by slowly cooling at a rate of 100 ° C./min or less, the thermal stress at the time of cooling is reduced, and solidification cracking is reliably prevented by a synergistic effect with the relaxation of the solidification stress.
【００１０】[0010]
【実施例】以下に実施例を挙げて本発明をより具体的に
説明する。The present invention will be described more specifically with reference to the following examples.
【００１１】実施例１ Ｎｂ：７８ａｔ％、Ａｌ：２２ａｔ％となるようにＮｂ
とＡｌ（いずれも純度９９．９９％以上の高純度品）を
秤量混合し、Ａｒ雰囲気下にて高周波誘導スカル溶解法
で溶解した後、φ８０×９０Ｈのジルコニア鋳型で鋳造
し、その凝固直後において、表１に示す温度で表１に示
す時間保持した後、表１に示す冷却速度で冷却した（た
だし、Ｎｏ．１では凝固後無処理）。得られた鋳塊の凝
固割れの有無を肉眼により調べ、結果を表１に示した。Example 1 Nb: 78 at%, Al: 22 at%
And Al (all high purity products having a purity of 99.99% or more) are weighed and mixed, and melted by a high-frequency induction skull melting method in an Ar atmosphere, and then cast in a zirconia mold of φ80 × 90H. After holding at the temperature shown in Table 1 for the time shown in Table 1, it was cooled at the cooling rate shown in Table 1 (however, no treatment after solidification in No. 1). The presence or absence of solidification cracking of the obtained ingot was visually inspected, and the results are shown in Table 1.
【００１２】表１より、本発明のＮｂ−Ａｌ金属間化合
物の製造方法によれば、結晶粒の粗大化を発生させるこ
となく、鋳造時の凝固割れを確実に防止することができ
ることが明らかである。From Table 1, it is clear that according to the method for producing an Nb-Al intermetallic compound of the present invention, solidification cracking during casting can be reliably prevented without causing coarsening of crystal grains. is there.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】以上詳述した通り、本発明のＮｂ−Ａｌ
金属間化合物の製造方法によれば、高温強度に著しく優
れたＮｂ−Ａｌ金属間化合物の鋳塊を、結晶粒の粗大化
といった欠陥を発生させることなく、鋳造時の凝固を確
実に防止して、著しく良好な鋳塊として容易かつ効率的
に製造することが可能とされる。As described in detail above, the Nb-Al of the present invention
According to the method for producing an intermetallic compound, an ingot of an Nb-Al intermetallic compound having remarkably excellent high-temperature strength can be reliably prevented from solidifying during casting without generating defects such as coarsening of crystal grains. , Can be easily and efficiently manufactured as a remarkably good ingot.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２２Ｆ 1/00 ６８１ Ｃ２２Ｆ 1/00 ６８１ ６９２ ６９２Ａ ６９３ ６９３Ａ ６９３Ｂ (58)調査した分野(Int.Cl.6，ＤＢ名) C22F 1/18 C22F 1/00 B22D 21/00 C22C 1/02 503 C22C 27/02 102──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. 6 identification code FI C22F 1/00 681 C22F 1/00 681 692 692A 693 693A 693B (58) Field surveyed (Int.Cl. 6 , DB name) C22F 1/18 C22F 1/00 B22D 21/00 C22C 1/02 503 C22C 27/02 102
Claims (1)
〜２５原子％を含んでなる合金溶湯を凝固させるＮｂ−
Ａｌ金属間化合物の製造方法において、前記溶湯が凝固
した直後の１０分以上の間１０００〜１５００℃に保持
し、その後、１００℃／ｍｉｎ以下の冷却速度で冷却す
ることを特徴とするＮｂ−Ａｌ金属間化合物の製造方
法。1. 75 to 81 atomic% of Nb and Al 19
Nb- which solidifies molten alloy containing up to 25 atomic%
In the method for producing an Al intermetallic compound, Nb-Al is maintained at 1000 to 1500 ° C. for 10 minutes or more immediately after the molten metal is solidified, and then cooled at a cooling rate of 100 ° C./min or less. A method for producing an intermetallic compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP824293A JP2762886B2 (en) | 1993-01-21 | 1993-01-21 | Method for producing Nb-Al intermetallic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP824293A JP2762886B2 (en) | 1993-01-21 | 1993-01-21 | Method for producing Nb-Al intermetallic compound |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06220598A JPH06220598A (en) | 1994-08-09 |
| JP2762886B2 true JP2762886B2 (en) | 1998-06-04 |
Family
ID=11687683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP824293A Expired - Fee Related JP2762886B2 (en) | 1993-01-21 | 1993-01-21 | Method for producing Nb-Al intermetallic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2762886B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115821083A (en) * | 2022-11-07 | 2023-03-21 | 中信金属股份有限公司 | Aluminum-niobium intermediate alloy and preparation method thereof |
-
1993
- 1993-01-21 JP JP824293A patent/JP2762886B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06220598A (en) | 1994-08-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980224 |
|
| LAPS | Cancellation because of no payment of annual fees |