JP3578832B2 - Gold alloy for jewelry - Google Patents
Gold alloy for jewelry Download PDFInfo
- Publication number
- JP3578832B2 JP3578832B2 JP12027595A JP12027595A JP3578832B2 JP 3578832 B2 JP3578832 B2 JP 3578832B2 JP 12027595 A JP12027595 A JP 12027595A JP 12027595 A JP12027595 A JP 12027595A JP 3578832 B2 JP3578832 B2 JP 3578832B2
- Authority
- JP
- Japan
- Prior art keywords
- ppm
- jewelry
- gold alloy
- pure
- hardness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【0001】
【産業上の利用分野】
本発明は、純Auに微量の元素を含有させて硬さを高くした宝飾用金合金に関する。
【0002】
【従来の技術】
Auは、耐蝕性、展延性に優れ、その色彩の優雅さから宝飾用品などに広く使用されている。
【0003】
【発明が解決しようとする課題】
ところが、純Auは非常に柔軟であり、硬さや機械的強度が低いために表面に傷が付き易く、変形し易いという問題があった。
【0004】
【課題を解決するための手段】
そこで本発明は、Pを5〜1000ppm、Siを10〜200ppm含有し、残部が99.5重量%以上のAuおよび不純物元素からなることを特徴とし、さらには、Pを5〜1000ppm、Siを10〜200ppm、Sb、Cu、Zn、Fe、Co、Ni、Ga、Ag、Geの中の一種以上を副添加元素とし、これら副添加元素を合計で10ppm以上で、これら副添加元素と不純物元素の合計が5000ppm以下を含有し、残部が99.5重量%以上のAuからなることを特徴とする。
【0005】
P とSiを添加元素とした理由は、鋳造後及び加工後における硬さを向上させるためである。
副添加元素であるSb,Cu,Zn,Fe,Co,Ni,Ga,Ag,Geは、鋳造時の流動性に効果があり、また、結晶を微細化し硬さの向上に効果がある。
添加元素の添加量をP を5 〜1000ppm がSiを10〜200ppmとしたのは、P 5ppmとSi10ppm 未満では硬さの向上に効果がなく、P 1000ppm とSi200ppmを超えると硬くなり過ぎて脆さがでてしまうためである。
【0006】
また、副添加元素の添加量が10ppm 未満では上記の効果が得られないためであり、上記副添加元素および不純物元素の合計が5000ppm を超えると金の品位の低下をきたし、色調においてもいわゆる純Auのもつ黄金色を失うからである。
【0007】
【作用】
以上の本発明によると、添加元素の作用によって純Auに比べて鋳造後の硬さが向上し、また、板材、線材の加工等の塑性加工においては加工硬化により硬さの上昇が大きくなる。
【0008】
【実施例】
以下に本発明の実施例を表1に示し、従来例として純Auを合わせて示す。
【0009】
【表1】
【0010】
表1に示す各試料は、まず、実施例に示す添加元素であるP とSiを主元素とした合金をアーク溶解にて鋳造して母合金とした。
つぎに、純Auに実施例に示す組成で上記母合金を配合し、上記同様アーク溶解を行い、厚さ10mm, 幅30mm, 長さ50mmのケーキ状の鋳造体とし、この鋳造体を、熱間鍛造で線用、板用に成形し、所定の形状まで加工を行って試料とした。
【0011】
その結果、表より明らかな如く、各実施例は純Auに比べて硬さが高い。
【0012】
【発明の効果】
以上詳細に説明した本発明によると、Auと称呼できる程の微量の添加元素組成でも、純Auに比べてほぼ同等の耐蝕性や純Au特有の光沢をもち、しかも硬さや機械的強度が高く、また添加量の多い場合は飛躍的に機械的特性の上昇となる効果を有し、宝飾用ばかりでなく、電子部品、医療分野等広い範囲で有用な金材料となる。[0001]
[Industrial applications]
The present invention relates to a gold alloy for jewelry in which a hardness is increased by adding a trace element to pure Au.
[0002]
[Prior art]
Au has excellent corrosion resistance and spreadability, and is widely used in jewelry and the like because of its elegant color.
[0003]
[Problems to be solved by the invention]
However, pure Au has a problem that it is very flexible and has low hardness and low mechanical strength, so that the surface is easily scratched and easily deformed.
[0004]
[Means for Solving the Problems]
Therefore, the present invention is characterized in that P contains 5 to 1000 ppm, Si contains 10 to 200 ppm, and the balance consists of 99.5% by weight or more of Au and an impurity element. 10 to 200 ppm, at least one of Sb, Cu, Zn, Fe, Co, Ni, Ga, Ag, and Ge is used as a sub-addition element, and the total of these sub-addition elements is 10 ppm or more. Is not more than 5000 ppm, and the balance consists of 99.5% by weight or more of Au .
[0005]
The reason why P and Si are added elements is to improve the hardness after casting and after processing.
Sb, Cu, Zn, Fe, Co, Ni, Ga, Ag, and Ge, which are sub-additional elements, have an effect on fluidity during casting, and have an effect on making crystals finer and improving hardness.
The reason why the addition amount of the additional element is 5 to 1000 ppm for P and 10 to 200 ppm for Si is that there is no effect on the improvement of hardness when P is less than 5 ppm and 10 ppm for Si, and that when P exceeds 1000 ppm and 200 ppm for Si, it becomes too hard and brittle. It is because it comes out.
[0006]
If the amount of the sub-additive element is less than 10 ppm, the above effect cannot be obtained. If the total amount of the sub-additive element and the impurity element exceeds 5,000 ppm, the quality of gold deteriorates, and the so-called pure This is because the gold color of Au is lost.
[0007]
[Action]
According to the present invention described above, the hardness after casting is improved as compared with pure Au due to the action of the additional element, and the increase in hardness due to work hardening in plastic working such as processing of a plate or wire is increased.
[0008]
【Example】
Examples of the present invention are shown in Table 1 below, and pure Au is also shown as a conventional example.
[0009]
[Table 1]
[0010]
Each sample shown in Table 1 was obtained by casting an alloy containing P and Si, which are the additional elements shown in Examples, as main elements by arc melting.
Next, the above-described mother alloy was mixed with pure Au with the composition shown in the example, and arc melting was performed in the same manner as described above to obtain a cake-like casting having a thickness of 10 mm, a width of 30 mm, and a length of 50 mm. It was formed into a wire or plate by cold forging and processed to a predetermined shape to obtain a sample.
[0011]
As a result, as is clear from the table, each example has a higher hardness than pure Au.
[0012]
【The invention's effect】
According to the present invention described in detail above, even with a trace amount of additive element composition that can be referred to as Au, it has almost the same corrosion resistance and luster unique to pure Au as compared to pure Au, and has high hardness and mechanical strength. Also, when the addition amount is large, it has the effect of dramatically increasing the mechanical properties, and is a gold material useful not only for jewelry but also for a wide range of fields such as electronic parts and medical fields.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12027595A JP3578832B2 (en) | 1995-05-18 | 1995-05-18 | Gold alloy for jewelry |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12027595A JP3578832B2 (en) | 1995-05-18 | 1995-05-18 | Gold alloy for jewelry |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08311581A JPH08311581A (en) | 1996-11-26 |
JP3578832B2 true JP3578832B2 (en) | 2004-10-20 |
Family
ID=14782209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12027595A Expired - Fee Related JP3578832B2 (en) | 1995-05-18 | 1995-05-18 | Gold alloy for jewelry |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3578832B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113265634B (en) * | 2021-04-28 | 2022-06-10 | 沈阳东创贵金属材料有限公司 | Rare earth alloy target material and preparation method and application thereof |
US11268174B1 (en) * | 2021-06-10 | 2022-03-08 | Chow Sang Sang Jewellery Company Limited | Jewelry alloy |
-
1995
- 1995-05-18 JP JP12027595A patent/JP3578832B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08311581A (en) | 1996-11-26 |
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