JP2788280B2 - Shape memory gold alloy - Google Patents
Shape memory gold alloyInfo
- Publication number
- JP2788280B2 JP2788280B2 JP1088914A JP8891489A JP2788280B2 JP 2788280 B2 JP2788280 B2 JP 2788280B2 JP 1088914 A JP1088914 A JP 1088914A JP 8891489 A JP8891489 A JP 8891489A JP 2788280 B2 JP2788280 B2 JP 2788280B2
- Authority
- JP
- Japan
- Prior art keywords
- shape memory
- alloy
- atomic
- gold
- gold alloy
- 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 - Lifetime
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は貴金属宝飾材料あるいは歯科用材料等に用い
る金合金に関し、特に形状記憶機能を利用した接合部材
あるいは保持部材を対象とするものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gold alloy used for precious metal jewelry materials, dental materials, and the like, and particularly to a joining member or a holding member utilizing a shape memory function. .
形状記憶機能を有する金合金としては例えば文献
（１）（ジャパニーズ ジャーナル オブ アプライド
ブィジックス.11巻.11号.1972年.1591〜1598頁）およ
び文献（２）（フィロソフィカル マガジン.30巻.1974
年.565〜581頁）に報告されているように金（Au）−銅
（Cu）−亜鉛（Zn）系合金がある。As a gold alloy having a shape memory function, for example, reference (1) (Japanese Journal of Applied Physics. Vol.11.11.1972.1591-1598) and reference (2) (Philosophical Magazine.30.1974)
565-581), there is a gold (Au) -copper (Cu) -zinc (Zn) alloy.
ここで報告されている合金はAu17〜36原子％、Cu19〜
38原子％およびZn45〜48原子％からなりAu組成では38.5
〜63重量％すなわち９カラット（K9）から15カラット
（K15）の範囲である。貴金属として考えた場合K18合金
を中心に市場が形成されておりこの範囲ではカラット数
が足りない。また色調も白色系になり金合金特有の黄金
色から離れ、装飾効果が損われる。The alloys reported here are Au 17-36 atomic%, Cu 19-
Consists of 38 atomic% and 45-48 atomic% of Zn,
~ 63% by weight or 9 carats (K9) to 15 carats (K15). When considered as a precious metal, the market is formed around K18 alloy, and the carat number is insufficient in this range. In addition, the color tone becomes white, which departs from the golden color peculiar to the gold alloy, and the decorative effect is impaired.
さらに加工温度の目安となるマルテンサイト変態温度
も−190℃から40℃の間にあり合金組成によっては極低
温での加工が要求される。以上の諸問題を考慮すると前
期文献に報告されているAu−Cu−Zn系形状記憶金合金は
宝飾材料としての実用の可能性が乏しい。Further, the martensitic transformation temperature, which is a measure of the working temperature, is between -190 ° C and 40 ° C, and working at an extremely low temperature is required depending on the alloy composition. Considering the above problems, the Au-Cu-Zn-based shape memory gold alloy reported in the above literature has little possibility of being practically used as a jewelry material.
本発明の目的はK18近傍のAu組成を有し、黄金色色調
で形状記憶機能を有する新規な宝飾用および歯科用金合
金を提供するにある。An object of the present invention is to provide a novel jewelry and dental gold alloy having an Au composition near K18, a golden color tone, and a shape memory function.
形状記憶合金はニッケル−チタン合金に代表されるよ
うに接合部材、アクチエーター等に使われその応用範囲
が広がりつつある。宝飾用および歯科用材料として利用
されている金合金においても形状記憶機能が付加されれ
ば新しい用途が見出される。例えばロウ接を避けたい場
合の接合部材、擬弾性を利用した保持部材、またはディ
スプレイの多様化等多く用途がある。Shape memory alloys are used for joining members, actuators and the like, as typified by nickel-titanium alloys, and their application range is expanding. Gold alloys used as jewelry and dental materials will find new applications if shape memory functions are added. For example, there are many uses such as a joining member for avoiding brazing, a holding member using pseudoelasticity, and diversification of displays.
ところで文献（１）および文献（２）に報告されてい
るAu−Cu−Zn系合金は前述のようにカラット数の不足、
色調の不具合および低変態点の問題があり実用化には到
ってない。これらの合金はZnを45原子％にほぼ固定し組
成を検討しているため前記の問題が解決されないと考え
られる。By the way, the Au-Cu-Zn alloy reported in the literatures (1) and (2) has a shortage of carats as described above.
It has not been put to practical use due to problems of color tone and low transformation point. It is considered that the above problems cannot be solved in these alloys because the composition is examined by fixing Zn at approximately 45 atomic%.
本発明はZn量を減らし、AuおよびCu量を増やすことに
よりこれらの問題を解決することができた。またAu−Cu
−Zn系合金は鋳造状態において結晶粒が粗大でその後の
加工は極めて困難である。本発明はリン（Ｐ）を微量添
加し鋳込み状態の結晶粒を微細化しその後の加工性を容
易にした。以下実施例により説明する。The present invention has solved these problems by reducing the amount of Zn and increasing the amounts of Au and Cu. Au-Cu
The crystal grains of the -Zn-based alloy are coarse in the casting state, and subsequent processing is extremely difficult. In the present invention, a small amount of phosphorus (P) is added to refine the crystal grains in the cast state, thereby facilitating subsequent workability. Hereinafter, an embodiment will be described.
〔実施例１〕 Au、Cu、およびZnを高周波溶解法により溶解した。得
られたインゴットを500℃で温間圧延し厚さ1mmの板材を
得た。板材より長さ70mm、幅7mmの形状記憶特性測定用
試料を切り出した。形状記憶特性は次のように測定し
た。試料を400℃〜550℃で30分加熱後水冷し形状記憶処
理を施した。さらに試料を−70℃まで冷却しその温度で
90度折り曲げた。次に試料を270℃まで加熱した。この
冷却、加熱は恒温槽で行なった。次に試料を常温に戻し
第１図に示すような形状回復角を測定し形状記憶特性と
した。すなわち形状回復角が大きい程形状記憶特性がす
ぐれていると判定される。Example 1 Au, Cu, and Zn were dissolved by a high frequency melting method. The obtained ingot was hot-rolled at 500 ° C. to obtain a 1 mm-thick plate. A sample for measuring shape memory characteristics having a length of 70 mm and a width of 7 mm was cut out from the plate material. Shape memory characteristics were measured as follows. The sample was heated at 400 ° C. to 550 ° C. for 30 minutes, cooled with water, and subjected to a shape memory treatment. Further cool the sample to -70 ° C and at that temperature
Folded 90 degrees. The sample was then heated to 270 ° C. This cooling and heating were performed in a thermostat. Next, the sample was returned to normal temperature, and the shape recovery angle as shown in FIG. 1 was measured to obtain a shape memory characteristic. That is, it is determined that the larger the shape recovery angle is, the better the shape memory characteristics are.
板材から長さ15mm、幅10mmの試料を切り出し、片面を
エメリー研磨紙およびダイヤモンド遊離砥粒で研磨し鏡
面を得、色差測定試料とした。色差はCIE−1976
（Ｌ＊、ａ＊、ｂ＊）表色モードで評価した。すなわち
75重量％金−12.5重量％銀−12.5重量％銅組成のK18金
合金を標準試料とし、その標準試料との色差として評価
した。標準試料の明度指数をL0 ＊、クロマティクネス指
数をa0 ＊、b0 ＊とし、評価試料の明度指数をＬ＊、クロ
マティクネス指数をａ＊、ｂ＊とすると色差ΔＥは次の
ように表わされる。A sample having a length of 15 mm and a width of 10 mm was cut out from the plate material, and one surface was polished with emery abrasive paper and diamond free abrasive grains to obtain a mirror surface, which was used as a color difference measurement sample. Color difference is CIE-1976
(L * , a * , b * ) Evaluation was made in the color mode. Ie
A K18 gold alloy having a composition of 75% by weight of gold, 12.5% by weight of silver, and 12.5% by weight of copper was used as a standard sample, and evaluated as a color difference from the standard sample. L 0 * a lightness index of the standard sample, and the chromaticness index a 0 *, a b 0 *, the lightness index evaluation sample L *, a a * chromaticness index, b * when the color difference ΔE is as follows Is represented.
色差ΔＥが小さい程標準K18金合金に色調が近く、良
好な色調であると判定される。 The smaller the color difference ΔE is, the closer the color tone is to the standard K18 gold alloy, and it is determined that the color tone is good.
マルテンサイト変態点も形状記憶合金の重要な特性の
一つである。すなわちこの変態点以下の温度で変形さ
せ、変態点以上に加熱し形状を回復させる。したがって
マルテンサイト変態点が低いと低温での加熱が要求され
る。マルテンサイト変態点は室温以上であることが好ま
しい。板材から5mmφの円板を切り出し示差走査熱量測
定（DSC）法によりマルテンサイト変態点を測定した。The martensitic transformation point is also one of the important properties of the shape memory alloy. That is, the material is deformed at a temperature lower than the transformation point and heated to a temperature higher than the transformation point to recover the shape. Therefore, when the martensite transformation point is low, heating at a low temperature is required. The martensitic transformation point is preferably at least room temperature. A 5 mmφ disk was cut out from the plate material, and the martensite transformation point was measured by differential scanning calorimetry (DSC).
第１表に合金組成と形状回復角、K18標準合金との色
差およびマルテンサイト変態点との関係を示す。ここで
試料番号の上位３桁は金相カラット数を表わし、例えば
1851はK18.5、1802はK18の金相になる。Table 1 shows the relationship between the alloy composition and the shape recovery angle, the color difference with the K18 standard alloy, and the martensitic transformation point. Here, the upper three digits of the sample number represent the gold carat number, for example,
1851 is K18.5 and 1802 is K18.
形状記憶機能を有し、実用性のある宝飾用材料として
以下の特性を満足させなければならない。形状記憶機能
は形状回復角により判定される。接合材、保持材として
応用するためには20℃以上の形状回復角が必要とされ
る。K18宝飾材料として使われるにはK18標準金合金との
色差ΔＥが12以下であることが必要とされる。またマル
テンサイト変態点は室温での加工を考慮すると50℃以上
が必要とされる。It has a shape memory function and must satisfy the following characteristics as a practical jewelry material. The shape memory function is determined by the shape recovery angle. A shape recovery angle of 20 ° C. or more is required for application as a joining material or a holding material. In order to be used as a K18 jewelry material, the color difference ΔE from the K18 standard gold alloy needs to be 12 or less. The martensitic transformation point is required to be 50 ° C. or higher in consideration of room temperature processing.
以上の要求を満足する合金組成範囲は第２図の斜線で
示す範囲である。すなわち金が47.5〜55.0原子％、亜鉛
が25〜40原子％、残余銅からなる組成範囲に限定する。The alloy composition range that satisfies the above requirements is the range shown by the hatched lines in FIG. That is, the composition range is limited to 47.5 to 55.0 atomic% of gold, 25 to 40 atomic% of zinc, and the balance of copper.
本発明によれば以上の組成範囲において十分な形状記
憶機能および黄金色色調を有する新規な形状記憶合金が
得られる。 According to the present invention, a novel shape memory alloy having a sufficient shape memory function and a golden color tone in the above composition range can be obtained.
〔実施例２〕 実施例１におけるAu−Cu−Zn系合金は鋳造状態で結晶
粒が粗く加工が困難である。したがって加工は温間圧延
によって行われた。本発明はAu−Cu−Zn合金に微量のリ
ンを添加することにより鋳造状態での結晶粒が微細化さ
れ加工性が改良されることも開示する。[Example 2] The Au-Cu-Zn alloy in Example 1 had coarse crystal grains in a cast state and was difficult to process. Therefore, the working was performed by warm rolling. The present invention also discloses that by adding a trace amount of phosphorus to an Au-Cu-Zn alloy, crystal grains in a cast state are refined and workability is improved.
第２表にAu50原子％−Cu20原子％−Zn30原子％合金に
０〜1.0重量％のリンを添加した時のリン添加量と冷間
加工性との関係を示す。冷間加工性は試料表面に亀裂の
発生が開始する加工率を臨界加工率とし、この臨界加工
率によって評価した。Table 2 shows the relationship between the amount of phosphorus added and the cold workability when 0 to 1.0% by weight of phosphorus is added to the Au 50 atomic% -Cu 20 atomic% -Zn 30 atomic% alloy. The cold workability was evaluated based on the critical working rate, which was defined as the working rate at which cracks started to form on the sample surface.
第２表によればリンを添加することにより冷間加工性
が改良されることがわかる。しかしリン添加量が0.005
重量％以下では冷間加工性は殆んど改良されない。また
添加量が多くなると合金が脆くなり1.0重量％添加のよ
うに冷間加工性が劣化する。したがって本発明のリン添
加量の範囲は0.01〜0.5重量％に限定する。また本実施
例はAu50原子％−Cu20原子％−Zn30原子％合金へのリン
添加効果を示したものであるが実施例１で限定された組
成のAu−Cu−Zn系形状記憶合金総てに同様な効果が認め
られる。Table 2 shows that the cold workability is improved by adding phosphorus. However, the amount of added phosphorus is 0.005
If the amount is less than 10% by weight, the cold workability is hardly improved. On the other hand, when the addition amount is large, the alloy becomes brittle and the cold workability is deteriorated as in the case of adding 1.0% by weight. Therefore, the range of the added amount of phosphorus of the present invention is limited to 0.01 to 0.5% by weight. In addition, this embodiment shows the effect of adding phosphorus to an alloy of 50 atomic% of Au—20 atomic% of Cu—30 atomic% of Zn. However, all the Au—Cu—Zn based shape memory alloys having the composition limited in Example 1 were used. Similar effects are observed.
〔発明の効果〕 本発明は十分な形状記憶機能、黄金色色調および貴金
属としての価値を有し加工性にずぐれた新規な金合金を
提供するもので宝飾用および歯科用の接合部材、保持部
材等に応用できる。 [Effects of the Invention] The present invention provides a novel gold alloy having sufficient shape memory function, golden color tone and value as a precious metal and excellent in workability. Applicable to members and the like.
第１図は形状記憶機能の指標となる形状回復角の説明
図、第２図は本発明Au−Cu−Zn系形状記憶合金の組成範
囲を示すAu−Cu−Zn系３元組成図である。FIG. 1 is an explanatory diagram of a shape recovery angle as an index of a shape memory function, and FIG. 2 is an Au—Cu—Zn based ternary composition diagram showing a composition range of the Au—Cu—Zn based shape memory alloy of the present invention. .
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 5/02──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) C22C 5/02
Claims (2)
％、残余銅からなり、形状記憶機能と黄金色の色調とを
有する形状記憶金合金。1. A shape memory gold alloy comprising 47.5 to 55.0 at% of gold, 25.0 to 40.0 at% of zinc, and the balance of copper, having a shape memory function and a golden color tone.
％、リン0.01〜0.5重量％、残余銅からなり、形状記憶
機能と黄金色の色調とを有する形状記憶金合金。2. A shape memory gold alloy comprising 47.5 to 55.0 atomic% of gold, 25.0 to 40.0 atomic% of zinc, 0.01 to 0.5% by weight of phosphorus, and residual copper, and having a shape memory function and a golden color tone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1088914A JP2788280B2 (en) | 1989-04-07 | 1989-04-07 | Shape memory gold alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1088914A JP2788280B2 (en) | 1989-04-07 | 1989-04-07 | Shape memory gold alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02267237A JPH02267237A (en) | 1990-11-01 |
| JP2788280B2 true JP2788280B2 (en) | 1998-08-20 |
Family
ID=13956203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1088914A Expired - Lifetime JP2788280B2 (en) | 1989-04-07 | 1989-04-07 | Shape memory gold alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788280B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA932674B (en) * | 1992-05-06 | 1995-03-16 | Mintek | The aesthetic enhancement or modification of articles or components made of non-ferrous metals. |
| JP6288917B2 (en) * | 2013-02-18 | 2018-03-07 | 石福金属興業株式会社 | Dental casting alloy and method for producing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617521B2 (en) * | 1985-04-02 | 1994-03-09 | 而至歯科工業株式会社 | Dental Au-Cu-Zu alloy using super elasticity |
-
1989
- 1989-04-07 JP JP1088914A patent/JP2788280B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02267237A (en) | 1990-11-01 |
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