JPS6134139A - Platinum alloy for accessory - Google Patents

Abstract

PURPOSE:To obtain a Pt alloy for accessories having superior workability, mechanical strength and castability by adding specified percentages of Co, W, Mo, Ti, V, Zr and Fe to Pt. CONSTITUTION:The Pt alloy consisting of 84-96wt% Pt, 0.5-10wt% Co and 0.5-5wt% in total of at least one among W, Mo, Ti, V, Zr and Fe is manufactured. The Pt alloy has higher hardness after annealing than that of a conventional Pt alloy for accessories, and when the alloy is cast, it also reproduces more exactly the fine pattern of a casting mold.

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２時計ハンド。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to rings, necklaces, brooches, tie pins, cufflinks, and two watch frames and two watch hands.

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。This invention relates to the improvement of platinum alloys used as materials for 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 its 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
％、コバルト０．５〜１０重量％、及びタングステン、
モリブデン、チタン、バナジウム、ジルコニウム、鉄の
少なくとも１種総量で０．５〜５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 contains 84 to 96% by weight of platinum, 0.5 to 10% by weight of cobalt, and tungsten.
The total amount of at least one of molybdenum, titanium, vanadium, zirconium, and iron is 0.5 to 5% by weight.

本発明による装飾品用白金合金に於いて、コバルトを添
加した理由は、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．
５〜１０重量％とじたのは０．５重量％未満では機械的
強さ及び鋳造性の向上が低く、１０重量％を超えると加
工性が著しく低下するからである。The reason why cobalt is added to the platinum alloy for ornaments according to the present invention is that it satisfies the conditions of not reacting with the mold during casting, suppressing oxygen concentration during casting, and improving mechanical strength and castability. This is because the amount added is 0.
The reason why it is limited to 5 to 10% by weight is that if it is less than 0.5% by weight, improvements in mechanical strength and castability will be low, and if it exceeds 10% by weight, workability will be significantly reduced.

まだタングステン、モリブデン、チタン、バナジウム、
ジルコニウム、鉄は白金またはコーバルトと金属間化合
物を作り、硬化して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改
善が殆んどなく、５重量％を超えると加工性が悪くなる
からである。Still tungsten, molybdenum, titanium, vanadium,
Zirconium and iron form intermetallic compounds with platinum or cobalt and harden to further improve mechanical strength. If the amount added is less than 0.5% by weight, there is little improvement in mechanical strength. This is because if it exceeds 5% by weight, processability will deteriorate.

以下本発明による装飾品用白金合金の効果を明瞭ならし
める為に実施例及び従来例について述べる。Examples and conventional examples will be described below in order to clarify the effects of the platinum alloy for ornaments according to the present invention.

（実施例及び従来例） 下表の左欄に示す成分組成の実施例１〜５の装飾品用白
金合金と従来例６．７の装飾品用白金合金の硬さ、鋳型
の細かい模様の再限度、及び、巣の発生度合いについて
、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 5 and the platinum alloys for ornaments of Conventional Examples 6 and 7 with the compositions shown in the left column of the table below, and the reproduction of fine patterns on the molds. The limits and the degree of occurrence of cavities were measured after annealing, and 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、鋳造した際の鋳型の細かい模様の再現度合も極め
て優れていることが判る。(Left below) As is clear from the above table, the platinum alloy for ornaments according to the present invention has superior hardness after annealing compared to conventional platinum alloys for ornaments, and the fine patterns of the mold when casting are improved. It can be seen that the degree of reproducibility is also extremely excellent.

（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
１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 (1)

【特許請求の範囲】[Claims] 白金８４〜９６重量％、コバルト０．５〜１０重量％、
及びタングステン、モリブデン、チタン、バナジウム、
ジルコニウム、鉄の少なくとも１種総量で０．５〜５重
量％より成る装飾品用白金合金。84-96% by weight of platinum, 0.5-10% by weight of cobalt,
and tungsten, molybdenum, titanium, vanadium,
A platinum alloy for ornaments comprising 0.5 to 5% by weight of at least one of zirconium and iron.