JPH1029086A - Low melting brazing filler metal for platinum ornaments - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a brazing filler metal which is of the same hue as the hue of platinum, has excellent corrosion resistance, wettability and brazing workability and is free from the odd feel of brazed parts and the ground texture by incorporating Ge, Sn and Pt into a ternary alloy of Ag, Cu and Zn. SOLUTION: The elements of at least either of the Ge and the S and further, the Pt are incorporated into the low melting brazing filler metal for platinum ornaments consisting of the ternary alloy of the Ag, Cu and Zn as the base. This brazing filler metal preferably contains 3 to 7% Ge and 5 to 15% Sn and further, 1 to 10% Pt in the Ag alloy consisting of 50 to 60% Ag, 15 to 25% Cu and 15 to 25% Zn. The working of the ornaments with such brazing filler metal without softening the brazing filler metal so much is possible at the time of brazing the Pt. The finish after brazing is good and luster is obtd. by polishing.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、白金装飾品用ろう
材に係り、特に耐食性を有し、溶融点が低く白金に似た
色調と光沢を有する低融点ろう材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing filler metal for platinum decorative articles, and more particularly to a low melting point brazing filler metal having corrosion resistance, a low melting point and a color tone and gloss similar to platinum.

【０００２】[0002]

【従来の技術】白金装飾品の製作時のろう付けには、従
来大別して２種類のろう材が使われている。１つは高融
点、高強度、耐食性に優れたろう材で、主成分はＰｔ、
Ｐｄ、Ｎｉ、Ａｕ、Ａｇ等の合金、使用温度は1000〜13
00℃、一般にＰｔ 850〜Ｐｔ900等の白金合金のろう付
けに用いられている。他の１つは 700〜1000℃で使用す
るもので、主成分はＡｇ、Ｃｕ、Ｎｉ、ＰｄにＺｎ、Ｓ
ｎ等を添加したものである。このろう材は、色調、接合
強度には問題は無いが、高温用のろう材に比べると、強
度、耐食性に劣る。2. Description of the Related Art Conventionally, two types of brazing materials have been used for brazing during the production of platinum decorative articles. One is a brazing filler metal with high melting point, high strength, and excellent corrosion resistance.
Alloys such as Pd, Ni, Au, Ag, etc., operating temperature is 1000 ~ 13
00 ° C., generally used for brazing platinum alloys such as Pt 850 to Pt 900. The other one is used at 700-1000 ° C. The main components are Ag, Cu, Ni, Pd with Zn, S
n and the like. This brazing material has no problem in color tone and bonding strength, but is inferior in strength and corrosion resistance as compared with high-temperature brazing material.

【０００３】近年、白金装飾品の世界でＰｔ1000が人気
を博しているが、この合金は白金の軟化を押さえ込む為
に純白金に微量の不純物元素を添加したもので、再結晶
温度は 700℃程度以上である。従って、ろう付け温度は
700℃を下回る温度であることが要求される。また、当
然のことながらろう材は白金と同系色の白色が要求さ
れ、更に耐食性の良さが必要となる。[0003] In recent years, Pt1000 has gained popularity in the world of platinum ornaments. However, this alloy is made by adding a small amount of impurity element to pure platinum to suppress the softening of platinum, and the recrystallization temperature is 700 ° C. More than a degree. Therefore, the brazing temperature is
It is required that the temperature be below 700 ° C. Naturally, the brazing material is required to have a white color similar to that of platinum, and furthermore to have good corrosion resistance.

【０００４】[0004]

【発明が解決しようとする課題】そこで本発明は、Ｐｔ
1000をろう付けしてもあまり軟化せず、所要の強度を保
持でき、またろう材の色調が白金と同系色で、耐食性、
濡れ性、ろう付け作業性も良い白金装飾品用低融点ろう
材を提供しようとするものである。SUMMARY OF THE INVENTION Accordingly, the present invention provides
It does not soften much even when brazing 1000, can maintain the required strength, and the color of the brazing material is similar to platinum, corrosion resistance,
It is an object of the present invention to provide a low melting point brazing material for platinum decorative articles having good wettability and brazing workability.

【０００５】この課題を解決するために本発明者らは、
先ずＰｔ1000の再結晶温度が 700℃程度以上であること
から、Ｐｔ1000の特長である高純度で高い硬さを保つ為
には、 700℃を下回る温度でろう付けできるろう材につ
いて検討した。また、ろう付け性については、装飾品用
Ｐｔ1000で加工した薄板（ 0.3ｔ×10ｗ×30ｌ）を２枚
突き合わせ、ＢＣフラックスを塗布し、酸素水素炎リト
ルトーチを用いてろう付けし、ろうのまわり具合を評価
し、ランク付けすることとした。また、ろう付け部を境
にして90度曲げを行い、曲がり具合をみて接合強度の良
否を判断することとした。また、耐食性に関しては、ろ
う付け面をバフ研摩した後、約１ヶ月室内に放置し、白
金の色とろうの色を比較し、色の差を調べることとし
た。[0005] In order to solve this problem, the present inventors:
First, since the recrystallization temperature of Pt1000 is about 700 ° C. or higher, brazing materials that can be brazed at a temperature lower than 700 ° C. were studied in order to maintain high purity and high hardness, which are the features of Pt1000. Regarding brazing properties, two thin plates (0.3t x 10w x 30l) processed with decorative Pt1000 were butted, BC flux was applied, and brazing was performed using an oxygen-hydrogen flame torch. The condition was evaluated and ranked. In addition, a 90-degree bending was performed around the brazing portion, and the degree of bending was judged based on the degree of bending. Regarding the corrosion resistance, after the brazed surface was buff-polished, it was left in a room for about one month to compare the platinum color with the wax color, and to examine the color difference.

【０００６】以上の評価方法を用意して、ＪＩＳＡｇろ
う及び従来使用されている表１の組成のNo. １〜No. ６
のろう材の中から融点を調べてＢＡｇ−１Ａ、ＢＡｇ−
７、No. １を選択し、これを物差として比較した。更に
Ｈａｎｓｅｎの二元合金の状態図から抽出して、Ａｇ−
Ｓｎ44％、Ａｇ−Ｓｎ40％、Ａｕ−Ｓｎ20％、三元合金
系でＡｇ−Ｃｕ−Ｓｎ、Ａｇ−Ｃｕ−Ｇｅ、Ａｇ−Ｓｎ
−Ｉｎ、Ａｇ−Ｓｎ−Ｃｄ等の合金系から 400〜 600℃
の融点の合金を抽出し、それを評価することとした。実
験での合金の熱分析はるつぼの中に熱電対をいれ、湯温
を測定しながら徐々に冷却し、その温度を記録し、冷却
曲線から液相線、固相線を求めた。また、色調も調べ
た。その結果を下記の表１に示す。[0006] The above evaluation methods were prepared, and JISAg wax and compositions No. 1 to No. 6 of the conventionally used compositions shown in Table 1 were prepared.
The melting point of BAg-1A, BAg-
7, No. 1 was selected and compared as a difference. Further, extracted from the phase diagram of the Hansen binary alloy, Ag-
Sn44%, Ag-Sn40%, Au-Sn20%, ternary alloys Ag-Cu-Sn, Ag-Cu-Ge, Ag-Sn
-In, Ag-Sn-Cd and other alloys 400-600 ° C
Was extracted and evaluated. In the thermal analysis of the alloy in the experiment, a thermocouple was placed in a crucible, gradually cooled while measuring the hot water temperature, the temperature was recorded, and the liquidus line and solidus line were obtained from the cooling curve. The color tone was also examined. The results are shown in Table 1 below.

【０００７】[0007]

【表１】 [Table 1]

【０００８】また、上記の表１に示されるろう材の広が
り試験での表面のビッカース硬さ及びろう付け継手の断
面のビッカース硬さを測定した処、下記の表２に示す結
果を得た。Further, when the Vickers hardness of the surface and the Vickers hardness of the cross section of the brazed joint in the spread test of the brazing material shown in Table 1 above were measured, the results shown in Table 2 below were obtained.

【０００９】[0009]

【表２】 [Table 2]

【００１０】次に上記の表２のろう材の広がり性、流れ
性、ろう付け後の光沢、バフ研摩後の色相、ろう付け継
手の曲げ性、硬さ、耐食性、ろう加工性について客観的
に良い順に◎、○、△、×の４段階で総合評価した処、
下記の表３に示すような結果を得た。Next, the spreadability, flowability, gloss after brazing, hue after buffing, bending property, hardness, corrosion resistance, and brazing workability of the brazed joint in Table 2 are objectively described.処, ○, △, ×
The results as shown in Table 3 below were obtained.

【００１１】[0011]

【表３】 [Table 3]

【００１２】上記の表３の結果をもとにＢＡｇ−７及び
No. ４に注目し、この性質を更に改善する為に、下記の
表４に示される合金を見い出した。Based on the results in Table 3 above, BAg-7 and
Paying attention to No. 4, in order to further improve this property, an alloy shown in Table 4 below was found.

【００１３】[0013]

【表４】 [Table 4]

【００１４】先ず、上記の表４に示す合金の熱分析を行
い、ろうの硬さを測定した結果を図１、図２のグラフに
示す。図１のグラフはＧｅ含有量と液相線との関係でろ
うの硬さを示してあり、図２のグラフはＳｎ含有量と液
相線との関係でろうの硬さを示してある。First, the results of the thermal analysis of the alloys shown in Table 4 above and the measurement of the hardness of the solder are shown in the graphs of FIGS. The graph of FIG. 1 shows the hardness of the wax in the relationship between the Ge content and the liquidus line, and the graph of FIG. 2 shows the hardness of the wax in the relationship between the Sn content and the liquidus line.

【００１５】次に上記の表４に示す合金について、切削
屑の形状、熱間の加工性、色相、広がり性、流れ性、継
手曲げ性、硬さ、溶け分かれについて客観的に良い順に
◎、○、△、×の４段階で総合評価した処、下記の表５
に示すような結果を得た。Next, regarding the alloys shown in Table 4 above, the shapes of cutting chips, hot workability, hue, spreadability, flowability, joint bendability, hardness, and melting are objectively improved in the order of ◎, Table 5 below shows the results of a comprehensive evaluation based on four levels of ○, △, and ×.
The result as shown in FIG.

【００１６】[0016]

【表５】 [Table 5]

【００１７】上記の表５の結果を更に検討すると、色相
は装飾品にとっては非常に重要なファクターであるの
で、No. ４−５は除き、No. ４−４及びNo. ４−６が優
れていた。ところがこのようなNo. ４−４やNo. ４−６
であるが厳密にその色調を見ると、まだ白金との色相の
違いがあり、さらに白金に色相を近づけることが望まれ
ていた。Further examination of the results in Table 5 above shows that hue is a very important factor for decorative articles, so that No. 4-4 and No. 4-6 are excellent except for No. 4-5. I was However, such No. 4-4 and No. 4-6
However, when the color tone is strictly observed, there is still a difference in the hue from platinum, and it has been desired to further bring the hue closer to platinum.

【００１８】[0018]

【課題を解決するための手段】前述の課題を解決するた
めの本発明の白金装飾品用低融点ろう材は、上述の試験
研究の結果をもとに開発したもので、その基本的なもの
はＡｇ、Ｃｕ、Ｚｎの三元合金をベースメタルとし、そ
の中に少なくともＧｅ及びＳｎのうちのいずれかの元素
を含み、さらにＰｔを含むことを特徴とするものであ
る。SUMMARY OF THE INVENTION The low melting point brazing material for platinum decorative articles of the present invention for solving the above-mentioned problems has been developed based on the results of the above-mentioned test and research, and its basic structure is as follows. Is characterized by using a ternary alloy of Ag, Cu and Zn as a base metal, containing at least one of Ge and Sn, and further containing Pt.

【００１９】本発明の白金装飾品用低融点ろう材に於い
て、ベースメタルとするＡｇ、Ｃｕ、Ｚｎの三元合金は
Ａｇ50〜60％、Ｃｕ15〜25％、Ｚｎ15〜25％より成るＡ
ｇろうであることが好ましく、そのＡｇろうに含む元素
はＧｅ３〜７％であることが好ましく、さらにＰｔは１
〜10％含むことが好ましい。In the low melting point brazing material for platinum decorative articles of the present invention, the ternary alloy of Ag, Cu, and Zn used as the base metal is composed of 50 to 60% Ag, 15 to 25% Cu, and 15 to 25% Zn.
g is preferable, and the element contained in the Ag is preferably 3 to 7% of Ge, and Pt is 1%.
It is preferable that the content is contained by 10%.

【００２０】また、本発明の白金装飾品用低融点ろう材
に於いて、ベースメタルとするＡｇ、Ｃｕ、Ｚｎの三元
合金は、Ａｇ50〜60％、Ｃｕ15〜30％、Ｚｎ10〜20％よ
り成るＡｇろうであることも好ましく、そのＡｇろうに
含む元素はＳｎ５〜15％であることが好ましく、さらに
Ｐｔは１〜10％含むことが好ましい。In the low melting point brazing material for platinum decorative articles of the present invention, the ternary alloy of Ag, Cu, and Zn used as the base metal is made of Ag 50-60%, Cu 15-30%, and Zn 10-20%. It is also preferable that the Ag wax is composed of, and the element contained in the Ag wax is preferably 5 to 15% of Sn, and more preferably 1 to 10% of Pt.

【００２１】[0021]

【発明の実施の形態】本発明の白金装飾品用低融点ろう
材の実施例を説明する。前述のNo. ４−４及びNo. ４−
６を母合金とし、これに夫々色相を白金に近づけること
と、耐食性を考慮してＰｔを 2.5％、５％、10％添加し
て低融点ろう材を作り、評価した結果、下記の表６に示
す液相線と固相線で判るようにNo. ４−４及びNo. ４−
６のいずれもＰｔ 2.5％の添加では溶融点は 645℃とさ
ほど上がらず、Ｐｔ1000のろう付けには全く問題が無い
ことが判った。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the low melting point brazing material for platinum decorative articles of the present invention will be described. No. 4-4 and No. 4-
6 was used as a mother alloy, and the hue was brought close to that of platinum, and 2.5%, 5%, and 10% of Pt were added to form a low melting point brazing material in consideration of corrosion resistance. As can be seen from the liquidus line and solidus line shown in No. 4-4 and No. 4-
In any of Nos. 6, the addition of 2.5% Pt did not raise the melting point to 645 ° C., indicating that there was no problem in brazing Pt 1000.

【００２２】また、No. ４−４にＰｔ５％を添加したも
のは、液相線が 655℃と高くなるが、ろう付け後のＰｔ
1000の硬さは目標の硬さ値 130を上まわり、Ｈｖ(0.2)
145となっていた。In the case of adding No. 4-4 with 5% Pt, the liquidus line becomes as high as 655 ° C.
A hardness of 1000 exceeds the target hardness value of 130, Hv (0.2)
It was 145.

【００２３】また、No. ４−６にＰｔ５％を添加したも
のも、同様に液相線は 675℃と高くなったが、ろう流れ
が良く、ろう付け後のＰｔ1000の硬さはＨｖ(0.2) 130
となり、使用の限界値に近い値を示していた。In the case of adding No. 4-6 to Pt 5%, the liquidus line similarly increased to 675 ° C., but the brazing flow was good, and the hardness of Pt 1000 after brazing was Hv (0.2%). ) 130
, Indicating a value close to the limit of use.

【００２４】また、ろう付け面をバフ研摩して色相を従
来のものと比較した結果、全く問題が無く、しかも１ヶ
月放置して色の変化を見たが、全く変化が見られなかっ
た。Further, as a result of buffing the brazed surface and comparing the hue with the conventional one, there was no problem at all, and the color change was observed after leaving it for one month, but no change was observed.

【００２５】[0025]

【表６】 [Table 6]

【００２６】[0026]

【発明の効果】以上の説明で判るように本発明の白金装
飾品用低融点ろう材は、Ｐｔ1000をろう付けした際、あ
まり軟化させず、所要の強度を保持させて指輪やネック
レス等の装飾品を加工することができ、またろう材の色
相が白金と同系色で耐食性、濡れ性、ろう付け作業性に
優れ、ろう付け後の仕上がりも良く、研摩して光沢があ
り、ろう付け部と地肌の違和感が無く、従来の白金装飾
品用低融点ろう材にとって代わることのできる画期的な
ものと言える。As can be seen from the above description, the low melting point brazing material for platinum decorative articles of the present invention does not soften much when brazing Pt1000, and retains the required strength to decorate rings, necklaces and the like. Can be processed, and the color of the brazing material is similar to platinum and has excellent corrosion resistance, wettability, brazing workability, good finish after brazing, glossy after polishing, It can be said to be an epoch-making material that has no uncomfortable feeling on the ground and can replace the conventional low melting point brazing material for platinum ornaments.

【図面の簡単な説明】[Brief description of the drawings]

【図１】白金装飾品用低融点ろう材に於いてＧｅ含有量
と液相線との関係でろうの硬さを示すグラフである。FIG. 1 is a graph showing the hardness of a low melting point brazing material for platinum decorative articles in relation to the Ge content and the liquidus line.

【図２】白金装飾品用低融点ろう材に於いてＳｎ含有量
と液相線との関係でろうの硬さを示すグラフである。FIG. 2 is a graph showing the hardness of a low melting point brazing material for platinum decorative articles in relation to the Sn content and the liquidus line.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 Ａｇ、Ｃｕ、Ｚｎの三元合金をベースメ
タルとし、その中に少なくともＧｅ及びＳｎのうちのい
ずれかの元素を含み、さらにＰｔを含むことを特徴とす
る白金装飾品用低融点ろう材。1. A low-grade platinum decorative article characterized in that a ternary alloy of Ag, Cu, and Zn is used as a base metal, and at least one of Ge and Sn is contained therein and further contains Pt. Melting point brazing material. 【請求項２】 ベースメタルとする三元合金が、Ａｇ50
〜60％、Ｃｕ15〜25％、Ｚｎ15〜25％より成るＡｇろう
であり、そのＡｇろうに含む元素がＧｅ３〜７％であ
り、さらにＰｔが１〜10％含むことを特徴とする請求項
１記載の白金装飾品用低融点ろう材。2. The ternary alloy used as a base metal is Ag50.
2. An Ag solder comprising -60% of Cu, 15-25% of Cu and 15-25% of Zn, wherein the element contained in the Ag solder is 3-7% of Ge and 1-10% of Pt. The low melting point brazing material for platinum decorative articles as described. 【請求項３】 ベースメタルとする三元合金が、Ａｇ50
〜60％、Ｃｕ15〜30％、Ｚｎ10〜20％より成るＡｇろう
であり、そのＡｇろうに含む元素がＳｎ５〜15％であ
り、さらにＰｔが１〜10％含むことを特徴とする請求項
１記載の白金装飾品用低融点ろう材。3. The ternary alloy used as a base metal is Ag50.
2. An Ag solder comprising -60% of Cu, 15-30% of Cu and 10-20% of Zn, wherein the elements contained in the Ag solder are 5-15% of Sn and 1-10% of Pt. The low melting point brazing material for platinum decorative articles as described.