JPS61186438A

JPS61186438A - Platinum alloy for ornament

Info

Publication number: JPS61186438A
Application number: JP2688785A
Authority: JP
Inventors: Fujimatsu Takiguchi; 滝口　藤松
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1985-02-14
Filing date: 1985-02-14
Publication date: 1986-08-20

Abstract

PURPOSE:To obtain a Pt alloy for an ornament having superior mechanical strength and castability as well as superior workability by blending Pt with specified amounts of Cu and Mo and/or W. CONSTITUTION:The composition of a Pt alloy for an ornament is composed of 84-96wt% Pt, 1-15wt% Cu and 0.1-7wt% in total of Mo and/or W. The reason that Mo and/or W is added is that Mo and W improve the mechanical strength and castability without deteriorating the workability, do not react with a casting mold during casting, and can restrict the concn. of oxygen during casting.

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
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 can be used as a material for rings, necklaces, brooches, tie clips, cufflinks, watch frames, watch bands, lighters, writing implements, eyeglass frames, earrings, etc. This paper relates to the improvement of platinum alloys.

（従来技術と問題点）従来、上述の如き装飾品の材料としては白金−パラジウ
ム（５−１５重量％）合金が多用され、その他白金−パ
ラジウムー銅合金が使用されている。(Prior Art and Problems) Conventionally, platinum-palladium (5-15% by weight) alloy is often used as a material for the above-mentioned ornaments, and platinum-palladium-copper alloy is also used.

然し乍ら前者の白金−パラジウム（５−１５重量％）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いう欠点があった。However, although the former platinum-palladium (5-15% by weight) alloy has excellent workability and castability, it has low mechanical strength, especially hardness, and is easily scratched and stamped during polishing, and its luster is poor. They are difficult to remove and are easily scratched when used as a finished product, and in the case of rings with jewels, the part that holds the jewels in place loosens and the jewels fall off.

また後者の白金−パラジウム−銅合金は、前記白金−パ
ラジウム合金と同様加工性に優れ、その上機械的強さに
も優れているが、鋳造時に鋳型と反応する為、細かい模
様が現われず、不鮮明になり、しかも酸素濃度を抑制で
きないため鋳巣が生じるという欠点があった。The latter platinum-palladium-copper alloy has excellent workability and mechanical strength like the platinum-palladium alloy, but because it reacts with the mold during casting, fine patterns do not appear. The problem was that the image became unclear, and that cavities were formed because the oxygen concentration could not be suppressed.

（発明の目的）本発明は上記欠点を解消せんが為になされたものであり
、加工性は勿論のこと機械的強さ、鋳造性に優れた装飾
品用白金合金を提供せんとするものである。(Object of the Invention) The present invention was made in order to eliminate the above-mentioned drawbacks, and aims to provide a platinum alloy for ornaments that is excellent in not only workability but also mechanical strength and castability. be.

（発明の構成）本発明による装飾品用白金合金は、白金８４〜９６重量
％、銅１〜１５重量％及びモリブデン、タングステンの
少なくとも１種総量で０．１〜７重量％より成るもので
ある。(Structure of the Invention) The platinum alloy for ornaments according to the present invention comprises 84 to 96% by weight of platinum, 1 to 15% by weight of copper, and 0.1 to 7% by weight of at least one of molybdenum and tungsten. .

本発明による装飾品用白金合金に於いて、モリブデン、
タングステンの少なくとも１種を添加した理由は、装飾
品用材料としての加工性を損なわないこと、鋳造時に鋳
型と反応しないこと及び鋳造時に酸素濃度を抑制できる
ことの条件を満し、機械的強さ及び鋳造性を向上させる
為であり、その添加量を０．１〜７重量％とじたのは０
．１重量％未満では機械的強さ及び鋳造性の向上が低く
、７重量％を超えると加工性が著しく低下するからであ
る。また本発明の装飾品用白金合金に於ける銅含有量は
、機械的強さ、価格、耐食性等の点から１〜１５重量％
が好ましい。In the platinum alloy for ornaments according to the present invention, molybdenum,
The reason for adding at least one kind of tungsten is that it satisfies the following conditions: it does not impair workability as a decorative material, it does not react with the mold during casting, it suppresses oxygen concentration during casting, and it has mechanical strength and This is to improve castability, and the amount added is 0.1 to 7% by weight.
．． This is because if it is less than 1% by weight, improvements in mechanical strength and castability will be low, and if it exceeds 7% by weight, workability will be significantly reduced. In addition, the copper content in the platinum alloy for ornaments of the present invention is 1 to 15% by weight from the viewpoint of mechanical strength, cost, corrosion resistance, etc.
is preferred.

（実施例及び従来例）下表の左欄に示す成分組成の実施例１〜４の装飾品用白
金合金と従来例５〜７の装飾品用白金合金の硬さ、鋳型
の細かい模様の再限度、巣の発生度合い及び結晶粒の大
きさについて、夫々焼なまし後に測定したところ、下表
の右欄に示すような結果を得た。(Examples and Conventional Examples) The hardness of the platinum alloys for ornaments of Examples 1 to 4 and the platinum alloys for ornaments of Conventional Examples 5 to 7 with the component compositions shown in the left column of the table below, and the reproduction of fine patterns on the molds. The limit, the degree of occurrence of cavities, and the size of crystal grains were measured after annealing, and the results shown in the right column of the table below were obtained.

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焼なまし後の硬さが
優れ、鋳造した際の鋳型の細かい模様の再限度合に優れ
、巣の発生度合も低いことが判る。As is clear from the table above, the platinum alloy for ornaments according to the present invention has superior hardness after annealing compared to conventional platinum alloys for ornaments, and has a higher hardness than the conventional platinum alloy for ornaments. It can be seen that the quality is excellent and the occurrence of nests is low.

（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。(Effects of the Invention) As detailed above, the platinum alloy for ornaments of the present invention has extremely excellent workability, mechanical strength, and castability, so it can be used as a substitute for conventional platinum alloys for ornaments. It can be said that it is temporary.

Claims

[Claims]

A platinum alloy for decorative articles comprising 84 to 96% by weight of platinum, 1 to 15% by weight of copper, and 0.1 to 7% by weight of at least one of molybdenum and tungsten.