JPS6176634A - Platinum alloy - Google Patents

Abstract

PURPOSE:To obtain a 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 Ru and one or more among Fe, Cr and Co to Pt. CONSTITUTION:The desired Pt alloy is obtd. by adding 0.1-5wt% Ru and 2-15wt% one or more kinds of iron group elements selected from Fe, Cr and Co to Pt. The Pt alloy has a small grain size and high machinability besides said characteristics, so it is hardly softened by heating in a brazing stage. The Pt alloy can give gemmy accessories which undergo little change and are hardly tarnished, and it can inhibit the falling of a jewel, etc. Accurate gemmy accessories can be manufactured easily.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本企明は、融点が高く、耐酸化性耐食性に優れていると
ころから、ｒＸ量計用のエレクトロード、カラス工業用
各種ノズル、医用器具用各種ノズルそして装飾品など広
範囲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] [Industrial Application Field] The present invention has a high melting point and excellent oxidation and corrosion resistance, so it can be used in electrodes for rX quantity meters, various nozzles for the crow industry, and medical instruments. This article relates to platinum-based alloys that are widely used in various nozzles and decorative items.

〔従来の技術〕[Conventional technology]

従来の工業用や装飾用の白金系合金としては、一般にＰ
ｔ−Ｐｄ、Ｐｔ−Ｒｈ、Ｐｔ−ｒｒ合金が知られており
、特殊な工業用のものを除いて、通常Ｐｄ、Ｒｈ、ｒｒ
の添加量は、何れも１０〜１５％ｗｔ　程度となってい
る。Conventional platinum-based alloys for industrial and decorative purposes are generally P.
t-Pd, Pt-Rh, Pt-rr alloys are known, and except for those for special industrial use, Pd, Rh, rr alloys are usually used.
The amount added is approximately 10 to 15% wt.

ところが上記の既知合金は、要求される加工性、硬さ、
引張り強さの点で満足すべき結果が得られていないだけ
でなく、さらに欠陥として最も問題とされるのは、再結
晶温度が低（て、加熱に対する抵抗が小さいこと、およ
び切削性が悪いことである。However, the above-mentioned known alloys do not have the required workability, hardness,
In addition to unsatisfactory results in terms of tensile strength, the most problematic defects are low recrystallization temperature (low resistance to heating) and poor machinability. That's true.

すなわち、例えば１０００℃以上の高温で使用されるガ
ラス工業用器具、装置や工業用坩堝には、９０％Ｐｔ−
Ｒｈ合金が多用されているが、高温下で長時間使用され
るため、一般には厚さを犬き４することによって順々高
温強度を得ている状態であり、また流量計用のエレクト
ロードや医用器具など複雑な切削加工を施す部品にあっ
ては、切削性の悪さから精度を出しにクク、工具の寿命
も著しく矩いものとなっている。That is, for example, 90% Pt-
Rh alloys are widely used, but since they are used for long periods of time at high temperatures, they are generally thinned to obtain high-temperature strength, and are also used in electrodes for flow meters, etc. When it comes to parts that require complicated cutting, such as medical instruments, it is difficult to achieve precision due to poor cutting performance, and the tool life is extremely short.

一方装飾用白金合金としては１０〜１５％のＰｄを添加
したものが多用されているが、指輪、ネクタイピン、ブ
ローチ、プレスレッド、ネツクレス、眼鏡フレームなど
の細工に際しては、どうしても、ろう何工程を避は難く
、当該ろう付に伴う加熱によって、このＰｔ−Ｐｄ合金
には急激な軟化が起り、このため、装飾品とじて二〇を
身につけても上記軟化のため変形や、くもりが生じ易（
原形の美しい形状を保持できず、特に石ものと呼ばれる
宝飾品の場合には、宝石を止める爪の充分な強度が得ら
れず、この結果宝石の止め箇所に弛みを生じたり、脱落
事故がおき易い難点がある。On the other hand, platinum alloys containing 10 to 15% Pd are often used as decorative platinum alloys, but when making rings, tie clips, brooches, pressed threads, netscles, eyeglass frames, etc., a waxing process is unavoidable. Unavoidable, the heating associated with brazing causes rapid softening of this Pt-Pd alloy, so even if you wear it as an ornament, it will easily deform or become cloudy due to the softening. (
In the case of jewelry that cannot maintain its original beautiful shape, and especially in the case of jewelry called stone items, the claws that hold the jewelry in place may not have sufficient strength, resulting in the jewelry being loosened or falling off. There are some easy difficulties.

〔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、上記従来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 been developed by considering the drawbacks of the conventional alloys mentioned above.
The purpose is to significantly improve the defects of the conventional example by adding an appropriate amount of a new element to Pt to form a ternary or higher alloy.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、上記目的を達成するため、Ｐｔ中に、Ｒｕが
重量比で０．１〜５　％と、Ｆｅ、Ｃｒ、Ｃｏの内から
選択された単数または複数の元素が、重量比で２〜１５
％添加されていることを特徴とする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 Pt containing 0.1 to 5% by weight of Ru and 2% by weight of one or more elements selected from Fe, Cr, and Co. ~15
% of platinum is added.

〔作　用〕[For production]

本発明でＰｔに添加するＲｕを０．１〜５％としたのは
、５チを越えてしまうと塑性加工が困難となり、０．１
％未満の添加ではＦｅ、Ｃｒ、Ｃｏ群との相乗添加効果
が得られないからである。In the present invention, the Ru added to Pt is set at 0.1 to 5% because if it exceeds 5%, plastic working becomes difficult.
This is because if the addition amount is less than %, a synergistic addition effect with the Fe, Cr, and Co groups cannot be obtained.

またＦｅ、Ｃｒ、Ｃｏ群の添加量上限を１５チとした理
由は、これを越える添加により卑金属量の増加に伴う溶
解鋳造性の低下が顕著となり、ピンホールやブローホー
ルが発生し易（なってしまい、さらに白金系合金として
の耐食性も損われるに至るためであり、下限を２％とし
たのは、それ未満では切削性の向上が充分に期待できな
々なってしまうからである。Furthermore, the reason why the upper limit of the addition amount of Fe, Cr, and Co groups was set at 15 is that if the amount of addition exceeds 15, the melting and castability decreases markedly due to the increase in the amount of base metal, and pinholes and blowholes are likely to occur. This is because the lower limit is set at 2% because if it is less than 2%, sufficient improvement in machinability cannot be expected.

〔実　施　例〕〔Example〕

一試料の総量を４００ｇとして、以下の（ａＬｔｆ＋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。The total amount of one sample was 400 g, and the following platinum-based alloys (aLtf+) were melted and cast in an arc melting furnace after weighing the component elements for each composition.

ｌａ）　　従　来　例（１１９０％　Ｐ　ｔ−１０％　
Ｐ　ｄｔｂｌ　　同　　　上ｆ２＋　　　９０チＰｔ−
１０％Ｒｈ（ｃｌ　　同　　　上（３１９０チＰｔ−１
０％Ｉ「（ｄｌ　　本発明合金（１）　　９５％Ｐｔ−
ｏ、ｓ％Ｒｕ　−２ｑｂ　Ｆ　ｅ　−０，５％Ｃｒ−２
９６Ｃ。la) Conventional example (1190% Pt-10%
P dtbl Same as above f2+ 90chi Pt-
10% Rh (cl Same as above (3190 Chi Pt-1
0%I"(dl Invention alloy (1) 95%Pt-
o, s%Ru -2qb Fe -0,5%Cr-2
96C.

ｔｅ）　　同　　　上＋２＋　　　９０％Ｐｔ−３％Ｒ
ｕ　−２％　Ｆ　ｅ　−５チＣｒ げ）同　　　上（３）　　　８５％ＰＬ−４％Ｒｕ−０
．．５％Ｆｅ−１０，５％Ｎｉ 上記の鋳塊を、熱間鍛造と切削加工により、厚さ１０間
、幅２０胴、長さ６０間の板状に成形すると共に、別途
断面形状１０　ｍｍ　Ｘ　１０　ｇで長さ３０酎の素材
を形成し、これらは１０００〜１２００℃に焼鈍と圧延
加工を繰り返しながら、夫々厚さ０．５　ｍｍの板と、
直径６顛の丸線に加工したが、この際何れの試料につい
ても加工工程を、すべて統一し、板の方の加工率は５０
チ、線の断面減少率は５０チとした。te) Same as above +2+ 90%Pt-3%R
(3) 85%PL-4%Ru-0
．． ．． 5%Fe-10,5%Ni The above ingot was formed into a plate shape with a thickness of 10 mm, a width of 20 mm, a length of 60 mm, and a cross-sectional shape of 10 mm x A material with a length of 30 g was formed using 10 g, and these were repeatedly annealed and rolled at 1000-1200°C to form a plate with a thickness of 0.5 mm.
The wire was processed into a round wire with a diameter of 6 pieces, but all the processing steps were unified for each sample, and the processing rate for the plate was 50%.
H. The cross-sectional reduction rate of the wire was set to 50 inches.

こ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。The table below shows the results of measuring various properties of the samples thus obtained.

ここで高温強度の測定については１次のような方法を採
用した。Here, the following first-order method was adopted for measuring high-temperature strength.

先ず前記した板状試料を幅２０酎、長さ６０簡に切断し
、これに８０φの通孔１を穿設した板２と、幅２０間、
長さ１５０閣に切断した同試料による板３とを、同図に
示す如＜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。First, the plate-shaped sample described above was cut into pieces of 20 mm wide and 60 mm long, and a plate 2 with a through hole 1 of 80 φ drilled therein, and a plate 2 with a width of 20 mm,
A plate 3 made of the same sample cut to a length of 150 cm 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 suspension rod was inserted into the through hole 1. 5, this was hung in a high temperature furnace and kept at 1450°C for 1 hour, and after cooling, both ends 3', 3 as seen from the front of the plate 3 as shown in FIG.
The amount of deflection of ′ is now measured.

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、エッチノブし測
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.

また切削性テストについては、卓上ボール盤を用い、第
４図に示す姉御前記の丸線（６φ×３０陥）である試料
６を鉛直状に保持し、その上端面６′に直交状にて、直
径３０間のドリル了により、中心部に８０　Ｏｒ、ｐ、
ｍ、；　、荷重３．　ｓ　Ｋｖで穿孔し、単位時間当り
の穿孔深さを測定する所謂穿孔試験により行い、穿孔特
性と等価的意味をもつ切削性を測知するようにした。Regarding the machinability test, using a tabletop drilling machine, hold the sample 6, which is the round wire (6φ x 30 holes) shown in FIG. After completing the drill with a diameter of 30 mm, a hole of 80 Or, p,
m, ; , load3. A so-called drilling test was conducted in which drilling was carried out at s Kv and the drilling depth per unit time was measured to measure machinability, which is equivalent to drilling characteristics.

表 上表によって明らかな通り（ｄｌ〜（ｆｌの試料合金は
、何れもｔａｌ〜ｌｃｌの従来合金に比し、硬さ、引張
り強さ共に格段の向上を示し、高温時におけるたわみ量
についても、従来例では１８〜２８瓢であるのに対し、
本発明合金では３〜９．５Ｍ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おり、穿孔特性も優れ従って切削
加工性も良好なものを提供することができる。As is clear from the table above, the sample alloys from dl to (fl all showed marked improvements in both hardness and tensile strength compared to the conventional alloys from tal to lcl, and the amount of deflection at high temperatures also increased. In contrast to the conventional example, which is 18 to 28 gourds,
The alloy of the present invention has a very small grain size of 3 to 9.5M, has significantly improved high-temperature strength, and has considerably finer grains, and has excellent drilling properties and good machinability. can provide something.

〔発明の効果〕〔Effect of the invention〕

本発明は餌記のように構成され、上記実施例の如（具現
できるものであるから、従来例に比し機械的特性は、常
温ではもちろん、高温域においても極めて優れており、
結晶流度も小さく切削性も良好なため、ろう付加工時の
加熱による軟化も少なく、変化の小さい、くもりも生じ
難い宝飾品を提供でき宝石の脱落事故等も抑制でき、高
精度のものを容易に製作でき、工具などの寿命も長くす
ることができると共に、薄手のものでも高温下の使用が
可能となる。The present invention is constructed as described above, and can be implemented as shown in the above embodiments. Therefore, compared to the conventional example, the mechanical properties are extremely superior not only at room temperature but also in a high temperature range.
Because the crystal flow rate is low and machinability is good, there is less softening due to heating during brazing, and we can provide jewelry that has little change and is less likely to become cloudy.It also prevents accidents such as jewelry falling off, and allows for high-precision items. It is easy to manufacture, extends the life of tools, etc., and even thin ones can be used at high temperatures.

【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る板にて形成した
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、第４図は同合金による丸線の穿
孔試験を説示する正面説明図である。 代理人　弁理士　　斎　藤　義　雄 第１図　　　　　第２図 第３図　　　　　　第柔図Fig. 1 is a perspective view showing a material for measuring high-temperature strength made of a platinum-based alloy plate 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 a FIG. 4 is a front view showing a round wire drilling test using the same alloy. Agent Patent Attorney Yoshio Saito Figure 1 Figure 2 Figure 3 Figure Souzu

Claims (1)

【特許請求の範囲】[Claims] Ｐｔ中に、Ｒｕが重量比で０．１〜５％と、Ｆｅ、Ｃｒ
、Ｃｏの内から選択された単数または複数の元素が、重
量比で２〜１５％添加されていることを特徴とする白金
系合金。In Pt, Ru is 0.1 to 5% by weight, Fe, Cr
, Co, in an amount of 2 to 15% by weight.