JPS61281839A

JPS61281839A - Platinum alloy for ornament

Info

Publication number: JPS61281839A
Application number: JP12370985A
Authority: JP
Inventors: Fujimatsu Takiguchi; 滝口　藤松
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1985-06-07
Filing date: 1985-06-07
Publication date: 1986-12-12

Abstract

PURPOSE:To provide a Pt alloy for an ornament consisting of prescribed weight percentage of Pt, Cu and Rh, having superior mechanical strength as well as superior workability and producing hardly blow holes during casting. CONSTITUTION:This Pt alloy for an ornament consists of 84-96wt% Pt, 1-15wt% Cu and 0.5-14wt% Rh. In the Pt alloy, Cu is added because it improves the mechanical strength and inhibits the production of blow holes during casting, and Rh is added because it controls the amount of copper oxide formed on the surface of molten metal during melting and further improves the mechanical strength without lowering the yield of products during casting. Since the Pt alloy has the above-mentioned superior characteristics, it is regarded as an epoch-making alloy substitutable for a conventional Pt alloy for an ornament.

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％）合金が多用されている。然し乍ら白
金−パラジウム合金は加工性に優れているが、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とき
も傷が付き＆く、殊に宝石付指輪の場合には、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。また鋳造時に巣が生じるという欠点があった。(Prior Art and its Problems) Conventionally, platinum-palladium (5 to 15% by weight) alloy has been widely used as a decorative material as described above. However, although platinum-palladium alloy has excellent workability, its mechanical strength and especially its hardness are low, so it is easily scratched and stamped during polishing, and it is difficult to produce gloss, and when used as a finished product. They are also prone to scratches, and especially in the case of rings with jewels, the part that holds the jewels in place loosens and the jewels fall off. Another drawback was that cavities were formed during casting.

（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に優れ、鋳造時に巣の
発生の少ない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 it is an object of the present invention to provide a platinum alloy for ornaments that has excellent workability as well as mechanical strength, and which produces fewer cavities during casting. That is.

（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％、ロジウム０．５〜１４重量％よ
りなる成るものである。(Structure of the Invention) The platinum alloy for ornaments according to the present invention consists of 84 to 96% by weight of platinum, 1 to 15% by weight of copper, and 0.5 to 14% by weight of rhodium.

本発明による装飾゛品用白金合金に於いて、銅を添加し
た理由は、機械的強さの向上及び鋳造時の巣の発生を抑
制する為であり、その添加量を１〜１５重四％とじたの
は１重量％未満では機械的強さの向上及び鋳造時の巣の
発生を抑制するに十分でなく、１５重量％を超えると溶
解時湯面に銅酸化物の発生量が多くなり、鋳造時その酸
化物のまきこみにより製品歩留が低下するからである。The reason why copper is added to the platinum alloy for decorative items according to the present invention is to improve mechanical strength and suppress the formation of cavities during casting, and the amount of copper added is 1 to 15% by weight. If the content is less than 1% by weight, it is not sufficient to improve mechanical strength and suppress the formation of cavities during casting, and if it exceeds 15% by weight, a large amount of copper oxide will be generated on the melt surface during melting. This is because the product yield is reduced due to the incorporation of the oxide during casting.

またロジウムを添加したのは、溶解持場面の銅酸化物の
発生量をおさえ、鋳造時の製品歩留を低下させることな
く、より一層機械的強さを向上させる為であり、その添
加量が０．５重量％未満では機械的強さの向上が低く、
１４重量％を超えると銅酸化物の発生量をおさえる効果
はあるが融点が高くなりすぎ、鋳造性を悪くするからで
ある。In addition, rhodium was added to suppress the amount of copper oxide generated in the melting process and to further improve mechanical strength without reducing the product yield during casting. If it is less than 0.5% by weight, the improvement in mechanical strength is low;
This is because if it exceeds 14% by weight, it has the effect of suppressing the amount of copper oxide generated, but the melting point becomes too high and castability deteriorates.

（実施例及び従来例）下表の左欄に示す成分塑性の実施例１〜３の装飾品用白
金合金と従来例の装飾品用白金合金の硬さ及び鋳造時の
巣の発生度合いについて、夫々測定したところ、下表の
右欄に示すような結果を得た。(Examples and Conventional Examples) Regarding the hardness and the degree of occurrence of cavities during casting of the platinum alloys for ornaments of Examples 1 to 3 and the platinum alloys for ornaments of conventional examples with component plasticity shown in the left column of the table below, When each was measured, the results shown in the right column of the table below were obtained.

（以下余白）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、鋳造時の巣の発生度合も低いことが判る。(Left below) 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 lower occurrence of cavities during casting. I understand that.

（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
、機械的強さが優れ、鋳造時の巣の発生度合も低いので
、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 excellent workability and mechanical strength, and the occurrence of cavities during casting is low, so it can replace conventional platinum alloys for ornaments. It can be said that this is an epoch-making thing that can be done.

Claims

[Claims]

84-96% by weight of platinum, 1-15% by weight of copper, 0.0% rhodium.
A platinum alloy for decorative articles consisting of 5 to 14% by weight.