JPS6176631A - High strength platinum alloy - Google Patents

Abstract

PURPOSE:To obtain a high strength Pt alloy having much superior mechanical characteristics at high temp. as well as ordinary temp. as compared with a conventional Pt alloy by adding prescribed weight percentages of Ni and one or more among Ru, Ir, Rh and W to Pt. CONSTITUTION:The desired high strength Pt alloy is obtd. by adding 1-15wt% Ni to Pt to strengthen the matrix and by further adding 0.05-5wt% one or more among Ru, Ir, Rh and W. The alloy has a small grain size besides said characteristics, and since gas is well vented when the alloy is melted and cast, pinholes and blow holes are hardly produced. The alloy also has high workability and gives an ingot having a smooth casting surface.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高強度が要求される各種工業用器具などに利用
されている白金系合金に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to platinum alloys used in various industrial instruments requiring high strength.

〔従来の技術〕[Conventional technology]

従来の高強度白金系合金としては、白金−イリジウム合
金あるいは白金−ロジウム合金等が知られており、その
組成は９０　％　Ｐ　ｔ　−Ｉ　ｒ、９０φＰｔ−Ｒｈ
が最も一般的なものである。As conventional high-strength platinum-based alloys, platinum-iridium alloys and platinum-rhodium alloys are known, and their compositions are 90% Pt-Ir, 90φPt-Rh.
is the most common one.

しかし、これらの既知合金は、充分に満足できる硬さや
引張り強さを具有しているとはいえず、また高温度にお
ける強度や耐力が小さく、さらに再結晶温度が低（て結
晶粒が粗大化してしまう欠陥があるだけでなく、鋳塊中
にピンホールやブローホールが発生し易いなどの問題点
がある。However, these known alloys cannot be said to have sufficiently satisfactory hardness and tensile strength, have low strength and proof stress at high temperatures, and have low recrystallization temperatures (which result in coarse grains). In addition to the defects that occur in the ingot, there are other problems such as the tendency for pinholes and blowholes to occur in the ingot.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明は、上記高強度白金系合金のもつ難点につき検討
を加え、ｐｔに新規な元素を適量だけ添加して三元以上
の合金とすることにより、前記従来例の欠陥を大巾に改
善しようとするのが、その目的である。The present invention has investigated the drawbacks of the above-mentioned high-strength platinum-based alloys, and has attempted to significantly improve the deficiencies of the above-mentioned conventional examples by adding an appropriate amount of a new element to PT to create a ternary or higher alloy. The purpose is to.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明は、上記目的を達成するため、ｐｔ中に、Ｎｉが
重量比で１〜１５％と、Ｒｕ、Ｉｒ、Ｒｈ、ｗの内から
選択された単数または複数の元素が重量比で０．０５〜
５チ添加されていることを特徴とする高強度白金系合金
を提供し得たものである。In order to achieve the above object, the present invention contains Ni in a weight ratio of 1 to 15%, and one or more elements selected from Ru, Ir, Rh, and w in a weight ratio of 0. 05～
This provides a high-strength platinum-based alloy characterized by the addition of 5%.

〔作　用〕[For production]

本発明でＰＩと、これに添加するＮｉは全率固溶型の合
金系であり、ｐｔにＮｉを加えることによりマトリック
スが強化されることになり、さらにこれに加える元素を
、Ｒｕ、Ｉ　ｒ、Ｒｈ、Ｗの内から単数または複数だけ
選択することで、再結晶温度が高くなって微結晶質とな
り、このことが主要因となって高温時のたわみ量も小さ
くなり高温時強度も向上するものと考えられ、また前記
の通り常温における硬さや引張り強度などの機械特性が
、後述の如く著しく改善されたのは、ＮｉとＲｕ、Ｉｒ
、Ｒｈ５Ｗ群よりの選択元素との複合添加効果によって
、低温時効硬化能が飛躍的に向上したためと思料される
。In the present invention, PI and Ni added to it are all solid solution type alloys, and by adding Ni to PT, the matrix is strengthened, and the elements added to it are Ru, I r , Rh, and W, the recrystallization temperature increases and the material becomes microcrystalline. This is the main factor that reduces the amount of deflection at high temperatures and improves the strength at high temperatures. As mentioned above, the mechanical properties such as hardness and tensile strength at room temperature were significantly improved as described below because of Ni, Ru, and Ir.
This is thought to be due to the dramatic improvement in low temperature age hardenability due to the combined addition effect with selected elements from the Rh5W group.

次に添加量としてＮｉをｐｔに対し１〜１５チとしたの
は、１５φを越えてしまうと白金合金として最も重要な
特性である耐食性が損われて実用上支障を来すからであ
り、１％未満の添加ではｐｔの地の強化効果が発揮され
ないためである。Next, the reason why the amount of Ni to be added is 1 to 15 mm per pt is because if the diameter exceeds 15 φ, corrosion resistance, which is the most important property for a platinum alloy, will be impaired, causing a practical problem. This is because if the addition amount is less than %, the effect of reinforcing the base of PT will not be exhibited.

さらに後者の選択元素に係る添加量については、前記の
５％を越えると、合金の鋳造性が阻害され、加工硬化が
激しくなって塑性加工が困難となってしまい、００５未
満であるとＮｉとの複合添加効果が得られなくなる。Furthermore, regarding the amount of the latter selective element added, if it exceeds the above 5%, the castability of the alloy will be inhibited and work hardening will become severe, making plastic working difficult. The effect of combined addition cannot be obtained.

〔実　施　例〕〔Example〕

一試料の総量を４００ｇとして、以下の（ａｌ〜ｔｆｌ
に示す白金系合金を、各組成毎に成分元素を秤量して、
アーク溶解炉にて溶解、鋳造した。Assuming that the total amount of one sample is 400g, the following (al~tfl
Weighing the component elements for each composition of the platinum-based alloy shown in
Melted and cast in an arc melting furnace.

（ａｌ従来例（１）９０％ＰＬ−１０％Ｒｈ［ｂｌ　　
　同　　　上（２）９０％Ｐｔ−１０％Ｉｒ＋ｃｌ　　
本発明合金（１１９５％Ｐｔ−２％Ｎ　ｉ−１４Ｉ　ｒ
　−１％Ｒｕ　−１％Ｗ ｔｄ＋　　　同　　　　上２）　　９０チＰｔ−６チＮ
　ｉ　−３，５係Ｒｈ−〇、５％Ｗ ｔｅｌ　　　同　　　　上（３１８５％Ｐｔ−ｔ　　１
％Ｎｉ−３％Ｉｒ−１％Ｗ げ）　　同　　　　上（４）８５％Ｐｔ−１１チＮ　ｉ
　−０，５％Ｒｈ３．５％Ｒｕ 上記の鋳塊を熱間鍛造と切削加工により、厚さＬｏｗ、
幅３０団、長さ６０ｍ＋ｎの板状に成形し、これを１０
００〜１２００℃にて焼鈍と圧延加工を操り返しながら
、０．５＋ｎ＋ｎの厚さとなるまで加工したが、これら
各試料の加工工程は、すべて統一させ最終加工率は６５
％とした。(al Conventional example (1) 90% PL-10% Rh [bl
Same as above (2) 90%Pt-10%Ir+cl
Invention alloy (1195%Pt-2%Ni-14Ir
-1%Ru -1%W td+ Same as above 2) 90chi Pt-6chiN
i -3,5 section Rh-〇, 5%W tel Same as above (3185%Pt-t 1
%Ni-3%Ir-1%W) Same as above (4) 85%Pt-11Ni
-0.5%Rh3.5%Ru The above ingot was hot forged and cut to a low thickness.
Formed into a plate shape with a width of 30 blocks and a length of 60 m+n, and
The annealing and rolling processes were repeated at 00 to 1200°C until the thickness was 0.5+n+n, but the processing steps for each sample were unified and the final processing rate was 65.
%.

二のようにして得られた試料につき、各種の特性を測定
した結果が下表であるが、ここで本発明合金（１）〜（
４）については硬さと引張り強さの測定用試料として、
４００℃にて１時間の時効処理を施したものが用いられ
た。The table below shows the results of measuring various properties of the samples obtained in step 2.
Regarding 4), as a sample for measuring hardness and tensile strength,
The material that had been aged at 400° C. for 1 hour was used.

また高温強度の測定については、次のような方法を採用
した。In addition, the following method was adopted for measuring high-temperature strength.

＠記した試料を幅２０馴、長さ６０ｗに切断し、これに
通孔１を第１図のように穿設した板２と、幅２０ｍｍ、
長さ１５０ｍｍに切断した同試料による板３とを、同図
の如＜Ｔ字状となるように小型精密級トーチバーナによ
り溶接部４にて固着し、次に通孔１に貫装した吊持杆５
により、これを高温炉内に吊して１４５０℃で１時間保
持し、冷却後第３図のように板３の正面から見た両端部
３’　、３’のたわみ量を計測するようにした。The sample marked @ was cut to a width of 20mm and a length of 60w, and a plate 2 with a through hole 1 bored therein as shown in Fig. 1, a width of 20mm,
A plate 3 made of the same sample cut to a length of 150 mm was fixed at the welding part 4 with a small precision torch burner so as to form a T-shape as shown in the figure, and then a hanging support inserted through the through hole 1 was used. Rod 5
Therefore, this was suspended in a high-temperature furnace and held at 1450°C for 1 hour, and after cooling, the amount of deflection of both ends 3' and 3' as seen from the front of the plate 3 was measured as shown in Figure 3. .

さらに、結晶粒度については、上記のようにたわみテス
トを終った試料につき、その断面を研磨、エツチングし
測微計にて測定した。Furthermore, the crystal grain size was measured using a micrometer after polishing and etching the cross section of the sample that had undergone the deflection test as described above.

表 上表によって明らかな通りｔｃｌ〜げ）の試料合金は、
何れも（ａｌ　（ｂｌの従来合金に比し、硬さ、引張り
強さ共に、格段に犬となり、高温時におけるたわみ量に
ついても、従来例では１８〜２１咽となっているのに比
し３〜９．５叫と非常に小さくなり、高温強度も著しく
向上しており、また結晶粒についても可成り微細なもの
となっている。As is clear from the table above, the sample alloys of tcl~ge) are:
In both cases, both the hardness and tensile strength are significantly higher than the conventional alloys of (al), and the amount of deflection at high temperatures is 3.2 mm compared to the conventional alloy of 18 to 21 mm. The grain size is extremely small at ~9.5 mm, the high-temperature strength is significantly improved, and the crystal grains are also quite fine.

〔発明の効果〕 本発明はｆｉｆｆ記のように構成され、上記実施例の如
く具現できるものであるから、従来例に比し機械特性は
、常温ではもちろん、高温域においても極めて優れてお
り、結晶粒度も小さく、しかもｉｆｆ記した溶解、鋳造
時にあっても、ガス抜けが良好で、ピンホールやブロー
ホールの発生が少なくて、加工性もよ（、鋳塊表面の鋳
肌も滑らかであることを確認することができた。[Effects of the Invention] Since the present invention is structured as in the Fiff and can be implemented as in the above embodiments, the mechanical properties are extremely superior not only at room temperature but also in the high temperature range, compared to the conventional example. The grain size is small, and even during melting and casting as described in IF, gas release is good, there are few pinholes and blowholes, and workability is good (and the surface of the ingot is smooth). I was able to confirm that.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明による白金系合金により形成した高温強
度の測定用資材を示す斜視図、第２図は同資材に吊持杆
を貫装した斜視図、第３図は第２図のものの高温処理後
における正面図である。 代理人　弁理士　　斎　藤　義　雄 第　１ ゝＮき 第　２　図 巳 ゝ＼く 第３図 シ ンFig. 1 is a perspective view showing a material for measuring high-temperature strength made of a platinum alloy according to the present invention, Fig. 2 is a perspective view of the same material with a hanging rod inserted through it, and Fig. 3 is the same as that shown in Fig. 2. It is a front view after high temperature processing. Agent Patent Attorney Yoshio Saito 1st ゝNki 2nd Figure 3

Claims (1)

【特許請求の範囲】 Ｐｔ中に、Ｎｉが重量比で１〜１５％と、 Ｒｕ、Ｉｒ、Ｒｈ、Ｗの内から選択された単数または複
数の元素が、重量比で０．０５〜５％添加されているこ
とを特徴とする高強度白金系合金。[Claims] Pt contains 1 to 15% by weight of Ni, and 0.05 to 5% by weight of one or more elements selected from Ru, Ir, Rh, and W. A high-strength platinum-based alloy characterized by the addition of additives.