JPH0848579A - Joining of alumina to niobium - Google Patents
Joining of alumina to niobiumInfo
- Publication number
- JPH0848579A JPH0848579A JP20608494A JP20608494A JPH0848579A JP H0848579 A JPH0848579 A JP H0848579A JP 20608494 A JP20608494 A JP 20608494A JP 20608494 A JP20608494 A JP 20608494A JP H0848579 A JPH0848579 A JP H0848579A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- al2o3
- joining
- inert gas
- joined
- 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.)
- Withdrawn
Links
Landscapes
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミナ（Ａｌ2 Ｏ3 ）
管とＮｂ管の接合方法に関し、特にアルカリ金属熱交換
素子の製作に有利に適用しうる同方法に関する。FIELD OF THE INVENTION The present invention relates to alumina (Al 2 O 3 ).
The present invention relates to a method for joining a pipe and an Nb pipe, and particularly to the same method that can be advantageously applied to the production of an alkali metal heat exchange element.
【０００２】[0002]
【従来の技術】アルカリ金属熱交換素子のＡｌ2 Ｏ3 管
とＮｂ管の接合においては、従来よりＡｌ−Ｓｉ合金、
Ｔｉ−Ａｇ−Ｃｕ合金のろう材を用いたろう付にて接合
していた。2. Description of the Related Art In joining Al 2 O 3 tubes and Nb tubes of an alkali metal heat exchange element, Al--Si alloy,
They were joined by brazing using a brazing material of Ti-Ag-Cu alloy.
【０００３】[0003]
【発明が解決しようとする課題】従来のアルカリ金属熱
交換素子のＡｌ2 Ｏ3 管とＮｂ管の接合方法ではろう材
の融点が６２０℃（Ａｌ−Ｓｉ合金ろう材）、８５０℃
（Ｔｉ−Ａｇ−Ｃｕ合金ろう材）のため、これ以上の高
温雰囲気でろう付材を使用すると、ろう材が融けるため
使用不可能であり、ろう材の成分（Ａｌ，Ａｇ，Ｃｕ）
が溶融塩（ＡｌＣｌ3 ，ＮａＣｌ）等に非常に腐食され
やすいため使用条件に限界があった。本発明は上記技術
水準に鑑み、従来技術におけるような不具合を解消しう
るＡｌ2 Ｏ3 管とＮｂ管の接合方法を提供しようとする
ものである。In the conventional joining method of Al 2 O 3 tube and Nb tube of the alkali metal heat exchange element, the melting point of the brazing material is 620 ° C. (Al-Si alloy brazing material), 850 ° C.
Because of the (Ti-Ag-Cu alloy brazing material), if the brazing material is used in a higher temperature atmosphere than this, the brazing material melts and cannot be used, and the brazing material components (Al, Ag, Cu)
However, there is a limit to the operating conditions because it is easily corroded by molten salt (AlCl 3 , NaCl) and the like. In view of the above-mentioned state of the art, the present invention aims to provide a method for joining an Al 2 O 3 tube and an Nb tube which can solve the problems of the prior art.
【０００４】[0004]
【課題を解決するための手段】本発明はＡｌ2 Ｏ3 管と
Ｎｂ管を接合するに際し、Ａｌ2 Ｏ3 管と接合する面の
Ｎｂ管表面にＴｉ層を拡散させ、該Ｔｉ層を拡散させた
Ｎｂ管表面とＡｌ2 Ｏ3 管を圧力を加えながら真空中ま
たは不活性ガス中で加熱することを特徴とするＡｌ2 Ｏ
3 管とＮｂ管の接合方法である。SUMMARY OF THE INVENTION The present invention upon bonding the Al 2 O 3 tube and Nb tube, to diffuse the Ti layer on the Nb tube surface of the surface to be bonded to Al 2 O 3 tube, spreading the Ti layer Al 2 O, which comprises heating in a vacuum or in an inert gas while applying a pressure of Nb tube surface and Al 2 O 3 tube is
This is a method of joining 3 tubes and Nb tubes.
【０００５】[0005]
【作用】本発明によれば、アルミナ管とＮｂ管の接合に
おいて、アルミナ管と接合するＮｂ管の一端部がＴｉを
含有し、これらを圧力を加えながら真空中か不活性ガス
中にて加熱を行い接合するが、これらには以下の作用が
ある。According to the present invention, in the joining of the alumina tube and the Nb tube, one end of the Nb tube joined to the alumina tube contains Ti, and these are heated in a vacuum or an inert gas while applying pressure. They are joined together by the above procedure, but they have the following effects.
【０００６】（１）Ｎｂ管の作用：金属にＮｂ管を用い
るのは、アルミナ管の線膨張係数に近似しているからで
あり、そうでないとこの係数差によりアルミナに割れが
発生する。(1) Action of Nb tube: The reason why Nb tube is used for metal is that it is close to the linear expansion coefficient of alumina tube. Otherwise, the difference of the coefficients causes cracking of alumina.
【０００７】（２）Ｔｉ層の作用：加熱することにより
Ａｌ2 Ｏ3 管の酸素をＮｂ管の表面のＴｉが還元し、こ
の層を介してＡｌあるいはＴｉが相互拡散する。(2) Function of Ti layer: By heating, oxygen in the Al 2 O 3 tube is reduced by Ti on the surface of the Nb tube, and Al or Ti interdiffuses through this layer.
【０００８】（３）圧力の作用：圧力を加えることによ
り拡散を促進させる。(3) Action of pressure: diffusion is promoted by applying pressure.
【０００９】（４）真空加熱か不活性ガス中での加熱の
作用：Ｔｉは活性金属であるため、この雰囲気により酸
化することなく良好な拡散接合部を得ることができる。(4) Action of vacuum heating or heating in an inert gas: Since Ti is an active metal, good diffusion bonding can be obtained without oxidation in this atmosphere.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図１、図２によっ
て説明する。図１はＮｂ管の表面にＴｉを拡散浸透させ
る方法についての説明図である。図１（ａ）において、
Ｎｂ管１をＮＨ4 Ｃｌ（０．２％）、Ａｌ2 Ｏ3 （１０
％）、金属Ｔｉ（残部）よりなる粉末２中で９５０℃×
５時間、不活性ガス中で加熱を行った。この処理によ
り、図１（ｂ）に示すように、Ｎｂ管１の表面には２０
〜３０μｍ厚さのＴｉの拡散層３が得られる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an illustration of a method of diffusing and permeating Ti into the surface of an Nb tube. In FIG. 1 (a),
The Nb tube 1 was filled with NH 4 Cl (0.2%), Al 2 O 3 (10
%) In powder 2 consisting of metallic Ti (the balance) × 950 ° C.
Heating was carried out in an inert gas for 5 hours. As a result of this treatment, as shown in FIG.
A Ti diffusion layer 3 having a thickness of ˜30 μm is obtained.
【００１１】次に図２によってＡｌ2 Ｏ3 管とＮｂ管の
接合方法を説明する。アルミナ管４と表面にＴｉの拡散
層３を形成したＮｂ管１を８０ｇ／ｍｍ2 の圧力下で４
×１０-4Ｔｏｒｒの真空中かＡｒガス又はＮ2 ガス中で
１０００℃、３時間保持して拡散接合を行った。この結
果、アルカリ金属熱交換素子として優れたＡｌ2 Ｏ3管
とＮｂ管の接合体が得られた。Next, a method of joining the Al 2 O 3 tube and the Nb tube will be described with reference to FIG. The alumina tube 4 and the Nb tube 1 having the Ti diffusion layer 3 formed on the surface thereof are placed under a pressure of 80 g / mm 2.
Diffusion bonding was carried out by holding at 1000 ° C. for 3 hours in a vacuum of × 10 −4 Torr or Ar gas or N 2 gas. As a result, an excellent joined body of Al 2 O 3 tube and Nb tube was obtained as an alkali metal heat exchange element.
【００１２】[0012]
【発明の効果】本発明によれば、Ａｌ2 Ｏ3 管とＮｂ管
の拡散接合温度が高い（例えば１０００℃）であるた
め、接合部は従来のろう付接合部より高い高温雰囲気で
の使用が可能であり、また、接合部が溶融塩等の薬品に
対し従来のろう材より腐食し難いという効果が奏され
る。以上の効果により本発明はアルミナ管とＮｂ管の接
合に適した接合方法であり、アルカリ金属熱交換素子の
製作に非常に有効な方法であるということができる。According to the present invention, since the diffusion bonding temperature of the Al 2 O 3 pipe and the Nb pipe is high (for example, 1000 ° C.), the joint is used in a high temperature atmosphere higher than that of the conventional brazing joint. In addition, the effect is obtained that the joint is less likely to be corroded by a chemical such as molten salt than the conventional brazing material. From the above effects, the present invention is a joining method suitable for joining an alumina tube and an Nb tube, and can be said to be a very effective method for manufacturing an alkali metal heat exchange element.
【図１】本発明の一実施例におけるＮｂ管の表面にＴｉ
拡散層を形成させる手段の説明図。FIG. 1 shows Ti on the surface of an Nb tube according to an embodiment of the present invention.
Explanatory drawing of the means to form a diffusion layer.
【図２】本発明の一実施例におけるＡｌ2 Ｏ3 管とＮｂ
管の接合方法の説明図。FIG. 2 is an Al 2 O 3 tube and Nb in one embodiment of the present invention.
Explanatory drawing of the joining method of a pipe.
【図３】本発明の実施例によって接合されたＡｌ2 Ｏ3
管とＮｂ管の接合部の金属組織を示す顕微鏡写真。FIG. 3 Al 2 O 3 bonded according to an embodiment of the present invention
The microscope picture which shows the metallographic structure of the junction part of a pipe and a Nb pipe.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長谷崎 和洋 長崎県長崎市深堀町五丁目717番１号 三 菱重工業株式会社長崎研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Hasezaki 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Ltd. Nagasaki Research Institute
Claims (1)
し、Ａｌ2 Ｏ3 管と接合する面のＮｂ管表面にＴｉ層を
拡散させ、該Ｔｉ層を拡散させたＮｂ管表面とＡｌ2 Ｏ
3 管を圧力を加えながら真空中または不活性ガス中で加
熱することを特徴とするＡｌ2 Ｏ3 管とＮｂ管の接合方
法。Upon joining 1. A Al 2 O 3 tube and Nb tube, to diffuse the Ti layer on the Nb tube surface of the surface to be bonded to Al 2 O 3 tube, Nb tube surfaces by diffusing the Ti layer and the Al 2 O
A method for joining an Al 2 O 3 tube and an Nb tube, which comprises heating the three tubes in a vacuum or an inert gas while applying pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20608494A JPH0848579A (en) | 1994-08-09 | 1994-08-09 | Joining of alumina to niobium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20608494A JPH0848579A (en) | 1994-08-09 | 1994-08-09 | Joining of alumina to niobium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0848579A true JPH0848579A (en) | 1996-02-20 |
Family
ID=16517561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20608494A Withdrawn JPH0848579A (en) | 1994-08-09 | 1994-08-09 | Joining of alumina to niobium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0848579A (en) |
-
1994
- 1994-08-09 JP JP20608494A patent/JPH0848579A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20011106 |