JPS61272335A

JPS61272335A - Ornamental platinum alloy

Info

Publication number: JPS61272335A
Application number: JP11359385A
Authority: JP
Inventors: Fujimatsu Takiguchi; 滝口　藤松
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1985-05-27
Filing date: 1985-05-27
Publication date: 1986-12-02

Abstract

PURPOSE:To develop an ornamental platinum alloy excelled in mechanical strength and workability by using Pt as principal component and alloying specific amounts of Ga and Ni. CONSTITUTION:As material for ornaments such as rings, necklaces, tiepins, watch frames, etc., the platinum alloy having a composition consisting of, by weight, 84-96% Pt, 2-10% Ga and 1-15% Ni is used. The ornamental material excelled in workability, mechanical strength and castability can be obtained.

Description

【発明の詳細な説明】（産業上の利用分野）本発明は指輪、ネックレス、ブローチ、ネクタイピン、
カフスボタン、時計枠、時計バンド、ライター、筆記用
具、°眼鏡枠、イヤリング等の材料として使用する白金
合金の改良に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to rings, necklaces, brooches, tie pins,
This invention relates to the improvement of platinum alloys used as materials for cufflinks, watch frames, watch bands, lighters, writing utensils, eyeglass frames, earrings, etc.

（従来技術とその問題点）従来、上述の如き装飾品材料としては白金−パラジウム
（５〜１５重量％）系合金が多用されている。この合金
は、加工性、鋳造性に優れているが、機械的強さ特に硬
さが低い為、研摩中にすり傷、押傷が付き易く且つ光沢
が出にくくまた完成品として使用している場合も傷が付
き易くまた宝石付指輪の場合、宝石を止めている部分が
ゆるんで宝石が脱落すると言う欠点があった。(Prior art and its problems) Conventionally, platinum-palladium (5 to 15% by weight) alloys have been widely used as ornamental materials as described above. This alloy has excellent workability and castability, but because of its low mechanical strength and particularly low hardness, it is easily scratched and stamped during polishing, and is difficult to produce gloss, and is used as a finished product. Rings with jewels also have the disadvantage that the part that holds the jewel in place loosens and the jewel can fall off.

（発明の目的）本発明は上記の欠点を解消せんが為になされたものであ
り、機械的強さ、加工性に優れた装飾用白金合金を提供
せんとするもである。(Object of the Invention) The present invention has been made to solve the above-mentioned drawbacks, and aims to provide a decorative platinum alloy with excellent mechanical strength and workability.

（発明の構成）本発明による装飾用白金合金は、白金８３〜９４重量％
、ガリウム２〜１０重量％、ニッケル１〜１５重量％よ
りなる時効硬化特性を具備したものである。(Structure of the Invention) The decorative platinum alloy according to the present invention has a platinum content of 83 to 94% by weight.
, 2 to 10% by weight of gallium, and 1 to 15% by weight of nickel, and has age hardening properties.

本発明による装飾用白金合金に於いて、ガリウムを添加
した理由は、Ｐｔ−Ｇａの２元状態図からも明らかなよ
うにＧａはｐｔに対して１３６１℃で最大固溶１６重量
％を示し、その固溶限は温度下降と共に漸次減少し、固
溶体領域まで加熱し急冷する溶体化処理を行った後、適
当な温度で時効させると著しい時効硬化性を現わす為で
ある。その添加量が２重量％未満では、硬さの改善が殆
んどなく１０重量％を超えるとＰｔとＧａが金属間化合
物を作り、加工性が悪くなるからである。In the decorative platinum alloy according to the present invention, the reason for adding gallium is that, as is clear from the Pt-Ga binary phase diagram, Ga shows a maximum solid solution of 16% by weight at 1361°C with respect to pt. This is because its solid solubility limit gradually decreases as the temperature decreases, and when it is subjected to solution treatment in which it is heated to a solid solution region and then rapidly cooled, it exhibits remarkable age hardening properties when aged at an appropriate temperature. If the amount added is less than 2% by weight, there will be little improvement in hardness, and if it exceeds 10% by weight, Pt and Ga will form an intermetallic compound, resulting in poor workability.

またニッケルを添加した理由は、Ｐｔ−３ｎ合金は固溶
体領域まで加熱し急冷する溶体化処理を行った後、適当
な温度で時効させると著しい時効硬化性を現わす為であ
る。また、ニッケルは白金の融点を低下し、鋳造性を向
上させる。その添加量が１重量％未満では硬さの改善が
殆んどなく１５重量％を超えると、加工性が悪くなるか
らである。The reason why nickel is added is that Pt-3n alloy exhibits remarkable age hardening properties when it is subjected to solution treatment in which it is heated to a solid solution region and then rapidly cooled, and then aged at an appropriate temperature. Further, nickel lowers the melting point of platinum and improves castability. This is because if the amount added is less than 1% by weight, there is little improvement in hardness, and if it exceeds 15% by weight, workability deteriorates.

（実施例）以下、本発明による装飾用白金合金の効果を明瞭ならし
める為に実施例および従来例について述べる。(Examples) Examples and conventional examples will be described below in order to clarify the effects of the decorative platinum alloy according to the present invention.

第１表に示す成分組成の実施例隘１〜阻５の装飾品用白
金合金と従来例１１ｈｌ、１ｌｈ２の装飾品用白金合金
の溶体化処理後の硬度、時効後の硬度、鋳造性について
調べたところ第２表のような結果を得た。　　（以下余
白）第　　１　　表第２表上記表で明らかなように本発明による装飾品用白金合金
は、従来の装飾品用白金合金に比し時効処理後の硬さが
優れ、また鋳造した際の鋳型の細かい模様の再度度合に
優れていることが判る・（発明の効果）以上詳記した通り、本発明の装飾品用白金合金は加工性
、機械的強さ、鋳造性が極めて優れているので、従来の
装飾品用白金合金にとって代わることのできる画期的な
ものと言える。The hardness after solution treatment, the hardness after aging, and the castability of the platinum alloys for ornaments of Examples 1 to 5 and the platinum alloys for ornaments of conventional examples 11hl and 1lh2 with the composition shown in Table 1 were investigated. The results shown in Table 2 were obtained. (Left below) Table 1 Table 2 As is clear from the above table, the platinum alloy for ornaments according to the present invention has superior hardness after aging treatment compared to conventional platinum alloys for ornaments, and also has better hardness when cast. (Effects of the Invention) As detailed above, the platinum alloy for ornaments of the present invention has extremely excellent workability, mechanical strength, and castability. Therefore, it can be said to be an epoch-making product that can replace conventional platinum alloys for decorative items.

Claims

[Claims]

A platinum alloy for ornaments consisting of 84 to 96% by weight of platinum, 2 to 10% by weight of gallium, and 1 to 15% by weight of nickel.