JP2001003101A - Silver powder for silver clay excellent in sinterability, and silver clay containing the same - Google Patents
Silver powder for silver clay excellent in sinterability, and silver clay containing the sameInfo
- Publication number
- JP2001003101A JP2001003101A JP11172204A JP17220499A JP2001003101A JP 2001003101 A JP2001003101 A JP 2001003101A JP 11172204 A JP11172204 A JP 11172204A JP 17220499 A JP17220499 A JP 17220499A JP 2001003101 A JP2001003101 A JP 2001003101A
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- JP
- Japan
- Prior art keywords
- silver
- weight
- silver powder
- clay
- sinterability
- 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.)
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Links
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- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、燒結性に優れた
銀粘土用銀粉末およびその銀粉末を含む銀粘土に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver powder for silver clay having excellent sinterability and a silver clay containing the silver powder.
【０００２】[0002]
【従来の技術】銀の宝飾品または美術工芸品は一般に鋳
造または鍛造により製造されている。しかし、近年、銀
粉末を含んだ銀粘土が市販されており、この銀粘土を所
定の形状に成形し、焼結して所定の形状を有する銀の宝
飾品または美術工芸品を製造する方法が提案されてい
る。この方法によると、銀粘土を通常の粘土細工と同じ
ように自由に造形を行うことができ、造形して得られた
造形体は、乾燥したのち、焼結炉を設置した場所に運
び、そこで焼結することにより極めて簡単に銀の宝飾品
または美術工芸品を製造することができる。BACKGROUND OF THE INVENTION Silver jewelry or arts and crafts are generally manufactured by casting or forging. However, in recent years, silver clay containing silver powder has been commercially available, and a method of molding this silver clay into a predetermined shape and sintering it to produce silver jewelry or arts and crafts having a predetermined shape is known. Proposed. According to this method, silver clay can be freely shaped in the same manner as ordinary clay work, and the shaped body obtained by shaping is dried and then carried to a place where a sintering furnace is installed, where it is placed. Sintering makes it very easy to produce silver jewelry or arts and crafts.
【０００３】前記従来の銀粘土は、純度：９９．９９重
量％以上の高純度Ａｇからなる銀属粉末：５０〜９５重
量％、セルローズ系水溶性バインダー：０．８〜８重量
％、油脂：０．１〜３重量％、界面活性剤：０．０３〜
３重量％を含有し、残りが水からなるものであることは
知られている（特開平４−２６７０７号公報参照）。[0003] The conventional silver clay has a purity of 99.99% by weight or more of high-purity Ag: a silver-based powder: 50 to 95% by weight, a cellulose-based water-soluble binder: 0.8 to 8% by weight, an oil and fat: 0.1 to 3% by weight, surfactant: 0.03 to
It is known that it contains 3% by weight and the remainder consists of water (see JP-A-4-26707).
【０００４】[0004]
【発明が解決しようとする課題】前述のように、銀粘土
は、通常、粘土細工と同じように自由に造形し、得られ
た造形体を乾燥したのち電気炉で焼結して所定の形状を
有する銀宝飾品または美術工芸品を製造するのである
が、従来の銀粘土の燒結は電気炉で２０〜３０分かけな
いと十分な強度の燒結体が得られない。電気炉による銀
粘土の燒結で電気料金にかかるコストは無視できないと
ころから、燒結時間は可及的に短時間で行われることが
好ましく、一層短時間で燒結が可能な燒結性に優れた銀
粘土が求められている。As described above, silver clay is usually shaped freely in the same manner as clay work, and the obtained shaped body is dried and then sintered in an electric furnace to a predetermined shape. However, conventional sintering of silver clay cannot be carried out in an electric furnace for 20 to 30 minutes to obtain a sintered body having sufficient strength. Since the cost of electricity costs in sintering silver clay with an electric furnace cannot be ignored, the sintering time is preferably as short as possible, and silver sintering with excellent sinterability that can be sintered in a shorter time. Is required.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明者らは、
かかる課題を解決すべく研究を行った結果、純度：９
９．９９重量％以上のＡｇにＳｎ，Ｐｂ，Ｃｕ，Ｂｉ，
Ｆｅの内の１種または２種以上を合計で２０〜９００ｐ
ｐｍを含有させた銀粉末は、燒結性が一層向上する、と
いう知見を得たのである。Means for Solving the Problems Accordingly, the present inventors have:
As a result of research to solve this problem, the purity: 9
9.99% by weight or more of Ag is added to Sn, Pb, Cu, Bi,
One or two or more of Fe in total of 20 to 900 p
It has been found that silver powder containing pm further improves sinterability.
【０００６】この発明は、かかる知見にもとづいてなさ
れたものであって、（１）Ｓｎ，Ｐｂ，Ｃｕ，Ｂｉ，Ｆ
ｅの内の１種または２種以上を合計で２０〜９００ｐｐ
ｍを含有し、残部がＡｇおよび不可避不純物からなる組
成の銀粉末からなる燒結性に優れた銀粘土用銀粉末、に
特徴を有するものである。The present invention has been made based on such findings, and (1) Sn, Pb, Cu, Bi, F
e, one or two or more of them in a total of 20 to 900 pp
m, and silver powder for silver clay excellent in sinterability, comprising silver powder having a composition of Ag and unavoidable impurities in the balance.
【０００７】この発明の銀粘土用銀粉末は、アトマイズ
粉末であることが好ましい。したがって、この発明は、
（２）Ｓｎ，Ｐｂ，Ｃｕ，Ｂｉ，Ｆｅの内の１種または
２種以上を合計で２０〜９００ｐｐｍを含有し、残部が
Ａｇおよび不可避不純物からなる組成のアトマイズ銀粉
末からなる燒結性に優れた銀粘土用銀粉末、に特徴を有
するものである。[0007] The silver powder for silver clay of the present invention is preferably an atomized powder. Therefore, the present invention
(2) Excellent sinterability comprising atomized silver powder having a composition of one or more of Sn, Pb, Cu, Bi and Fe in total of 20 to 900 ppm, with the balance being Ag and unavoidable impurities. Silver powder for silver clay.
【０００８】前記Ｓｎ，Ｐｂ，Ｃｕ，Ｂｉ，Ｆｅの内の
１種または２種以上を合計で２０〜９００ｐｐｍに限定
した理由は、これら元素が２０ｐｐｍ未満では十分な燒
結性改善効果が得られず、一方、９００ｐｐｍを越えて
含有すると純銀として品位保証上問題が生じるので好ま
しくないことによるものである。前記（１）または
（２）記載の銀粉末は燒結性に優れており、前記（１）
または（２）記載の銀粉末：５０〜９５重量％に対し
て、バインダ−：０．８〜８重量％を添加した銀粘土、
または前記（１）または（２）記載の銀粉末：５０〜９
５重量％に対して、バインダー：０．８〜８重量％、界
面活性剤：０．０３〜３重量％を添加した銀粘土、また
は前記（１）または（２）記載の銀粉末：５０〜９５重
量％に対して、バインダー：０．８〜８重量％、油脂：
０．１〜３重量％、界面活性剤：０．０３〜３重量％を
添加した銀粘土もこの発明に含まれる。The reason why one or more of Sn, Pb, Cu, Bi and Fe is limited to a total of 20 to 900 ppm is that if these elements are less than 20 ppm, a sufficient sinterability improving effect cannot be obtained. On the other hand, if the content exceeds 900 ppm, a problem arises in terms of quality assurance as pure silver, which is not preferable. The silver powder according to the above (1) or (2) is excellent in sinterability, and
Or silver clay according to (2), wherein a binder: 0.8 to 8% by weight is added to 50 to 95% by weight of a silver clay;
Or the silver powder according to the above (1) or (2): 50 to 9
Silver clay to which 0.8% to 8% by weight of a binder and 0.03% to 3% by weight of a surfactant are added to 5% by weight, or silver powder described in the above (1) or (2): Binder: 0.8 to 8% by weight, fats and oils: 95% by weight
Silver clay to which 0.1 to 3% by weight and surfactant: 0.03 to 3% by weight are added is also included in the present invention.
【０００９】したがって、この発明は、（３）前記
（１）または（２）記載の銀粉末：５０〜９５重量％、
バインダ−：０．８〜８重量％、残りが水からなる燒結
性に優れた銀粘土、（４）前記（１）または（２）記載
の銀粉末：５０〜９５重量％、バインダー：０．８〜８
重量％、界面活性剤：０．０３〜３重量％を含有し、残
りが水からなる燒結性に優れた銀粘土、（５）前記
（１）または（２）記載の銀粉末：５０〜９５重量％、
バインダー：０．８〜８重量％、油脂：０．１〜３重量
％を含有し、残りが水からなる燒結性に優れた銀粘土、
（６）前記（１）または（２）記載の銀粉末：５０〜９
５重量％、バインダー：０．８〜８重量％、油脂：０．
１〜３重量％、界面活性剤：０．０３〜３重量％を含有
し、残りが水からなる燒結性に優れた銀粘土、に特徴を
有するものである。Therefore, the present invention provides (3) a silver powder according to the above (1) or (2): 50 to 95% by weight;
Binder: 0.8 to 8% by weight, silver sinter consisting of water with excellent sinterability; (4) Silver powder as described in the above (1) or (2): 50 to 95% by weight; 8-8
% By weight, surfactant: 0.03 to 3% by weight, the balance being water and excellent in sinterability. (5) Silver powder according to the above (1) or (2): 50 to 95. weight%,
Binder: 0.8 to 8% by weight, fats and oils: 0.1 to 3% by weight, the balance being water and excellent in sintering properties,
(6) Silver powder according to the above (1) or (2): 50 to 9
5% by weight, binder: 0.8 to 8% by weight, fat: 0.
It is characterized by a silver clay which contains 1 to 3% by weight and a surfactant: 0.03 to 3% by weight, and the remainder is water and has excellent sinterability.
【００１０】銀粘土の燒結性は、銀粘土に含まれる銀粉
末の粒度を極度に微細にすることにより向上するが、銀
粉末の粒度を所定値以下に微細に揃えるにはコストがか
かりすぎる。したがって、この発明の燒結性に優れた銀
粉末の粒径は平均粒径：１〜２５μｍの範囲内にあるこ
とが好ましい。この発明の燒結性に優れた銀粘土に含ま
れる前記（１）または（２）記載の銀粉末の量を５０〜
９５重量％に限定したのは、５０重量％未満では得られ
た焼成体の金属光沢を示すに十分な効果が得られず、一
方、９５重量％を越えて含有すると粘土としての伸びお
よび強度が低下するようになるので好ましくないからで
ある。銀粉末の含有量の一層好ましい範囲は７０〜９５
重量％である。[0010] The sinterability of silver clay is improved by making the particle size of the silver powder contained in the silver clay extremely fine, but it is too costly to make the particle size of the silver powder fine below a predetermined value. Therefore, the particle size of the silver powder excellent in sinterability of the present invention is preferably in the range of average particle size: 1 to 25 µm. The amount of the silver powder according to the above (1) or (2) contained in the silver clay excellent in sinterability of the present invention is from 50 to 50%.
The reason why the content is limited to 95% by weight is that if the content is less than 50% by weight, a sufficient effect to show the metallic luster of the obtained fired body cannot be obtained, while if the content exceeds 95% by weight, the elongation and strength as a clay become poor. This is because it is not preferable because it decreases. A more preferred range of the silver powder content is 70 to 95.
% By weight.
【００１１】この発明の燒結性に優れた銀粘土に含まれ
るバインダーは、セルロース系バインダー、ポリビニー
ル系バインダー、アクリル系バインダー、ワックス系バ
インダー、樹脂系バインダー、澱粉、ゼラチン、小麦粉
などいかなるバインダーを使用してもよいが、セルロー
ス系バインダー、特に水溶性セルロースが最も好まし
い。これらバインダーは、加熱すると速やかにゲル化し
て造形体の形状保持を容易にするために添加するが、そ
の添加量は０．８重量％未満では効果がなく、一方、８
重量％を越えて含有すると、得られた造形体に微細なひ
び割れが発生し、光沢も減少するので好ましくない。し
たがって、この発明の燒結性に優れた銀粘土に含まれる
バインダーは、０．８〜８重量％に定めた。バインダー
含有量の一層好ましい範囲は０．８〜５重量％である。As the binder contained in the silver clay having excellent sinterability of the present invention, any binder such as a cellulose binder, a polyvinyl binder, an acrylic binder, a wax binder, a resin binder, starch, gelatin and wheat flour is used. However, cellulose-based binders, especially water-soluble cellulose, are most preferred. These binders are added for the purpose of gelling quickly upon heating and for facilitating the maintenance of the shape of the shaped body. However, if the added amount is less than 0.8% by weight, there is no effect.
If the content is more than the weight percentage, minute cracks are generated in the obtained shaped body, and the gloss is undesirably reduced. Therefore, the binder contained in the silver clay excellent in sinterability of the present invention is set to 0.8 to 8% by weight. A more preferred range for the binder content is 0.8 to 5% by weight.
【００１２】前記界面活性剤は必要に応じて添加し、添
加する場合の添加量は０．０３〜３重量％が好ましい。
また、添加する界面活性剤の種類は特に限定されるもの
ではなく、通常の界面活性剤を使用することができる。The above-mentioned surfactant is added as needed, and when added, the amount of addition is preferably 0.03 to 3% by weight.
The type of surfactant to be added is not particularly limited, and a normal surfactant can be used.
【００１３】前記油脂も必要に応じて添加し、添加する
場合の添加量は０．１〜３重量％が好ましい。添加する
油脂は有機酸（オレイン酸、ステアリン酸、フタル酸、
パルミチン酸、セパシン酸、アセチルクエン酸、ヒドロ
キシ安息香酸、ラウリン酸、ミリスチン酸、カプロン
酸、エナント酸、酪酸、カプリン酸、カプリル酸）、有
機酸エステル（メチル基、エチル基、プロピル基、ブチ
ル基、オクチル基、ヘキシル基、ジメチル基、ジエチル
基、イソプロピル基、イソブチル基を有する有機酸エス
テル）、高級アルコール（オクタノール、ノナノール、
デカノール）、多価アルコール（グリセリン、アラビッ
ト、ソルビタン、）、エーテル（ジオクチルエーテル、
ジデシルエーテル）などがある。The above fats and oils are also added as required, and when added, the amount of addition is preferably 0.1 to 3% by weight. The added fats and oils are organic acids (oleic acid, stearic acid, phthalic acid,
Palmitic acid, sebacic acid, acetylcitric acid, hydroxybenzoic acid, lauric acid, myristic acid, caproic acid, enanthic acid, butyric acid, capric acid, caprylic acid), organic acid esters (methyl, ethyl, propyl, butyl) Octyl group, hexyl group, dimethyl group, diethyl group, isopropyl group, organic acid ester having an isobutyl group), higher alcohol (octanol, nonanol,
Decanol), polyhydric alcohols (glycerin, arabbit, sorbitan,), ethers (dioctyl ether,
Didecyl ether).
【００１４】[0014]
【発明の実施の形態】表１に示される組成を有する平均
粒径：５μｍのアトマイズ銀粉末Ａ〜Ｎを用意した。BEST MODE FOR CARRYING OUT THE INVENTION Atomized silver powders A to N having a composition shown in Table 1 and having an average particle size of 5 μm were prepared.
【００１５】[0015]
【表１】 [Table 1]
【００１６】一方、バインダーとしてエチルセルロー
ズ、界面活性剤、油脂としてフタル酸−ｎ−ジブチルお
よび水を用意した。On the other hand, ethyl cellulose and a surfactant were prepared as a binder, and n-dibutyl phthalate and water were prepared as fats and oils.
【００１７】表１に示されるアトマイズ銀粉末Ａ〜Ｎに
対し、エチルセルローズ、界面活性剤、フタル酸−ｎ−
ジブチルおよび水を表２に示される割合で配合し混合す
ることにより表２に示される本発明銀粘土１〜１１、比
較銀粘土1〜２および従来銀粘土１を作製した。For atomized silver powders A to N shown in Table 1, ethyl cellulose, a surfactant, phthalic acid-n-
By mixing and mixing dibutyl and water at the ratios shown in Table 2, Silver Clays 1 to 11 of the present invention, Comparative Silver Clays 1 and 2, and Conventional Silver Clay 1 shown in Table 2 were produced.
【００１８】これら本発明銀粘土１〜１１、比較銀粘土
1〜２および従来銀粘土１を成形し９００℃の温度で１
５分間燒結することにより縦：３ｍｍ、横：４ｍｍ、長
さ：６５ｍｍの寸法を有する試験片燒結体を作製し、得
られた試験片燒結体の引張り強度を測定し、その結果を
表２に示すことにより銀粉末および銀粘土の燒結特性を
評価した。さらに得られた試験片燒結体の銀品位を測定
し、その結果を表２に示した。These silver clays 1 to 11 of the present invention and comparative silver clay
1 and 2 and conventional silver clay 1
By sintering for 5 minutes, a test piece sintered body having dimensions of length: 3 mm, width: 4 mm, and length: 65 mm was prepared, and the tensile strength of the obtained test piece sintered body was measured. The sintering characteristics of the silver powder and the silver clay were evaluated by showing. Further, the silver quality of the obtained test piece sintered body was measured, and the results are shown in Table 2.
【００１９】[0019]
【表２】 [Table 2]
【００２０】表１〜２に示される結果から、Ｓｎ，Ｐ
ｂ，Ｃｕ，Ｂｉ，Ｆｅの内の１種または２種以上：２０
〜９００ｐｐｍを含有し、残部が純度：９９重量％以上
のＡｇからなる組成のアトマイズ銀粉末を含む本発明銀
粘土１〜１１は、２０〜９００ｐｐｍの範囲外のＳｎ，
Ｐｂ，Ｃｕ，Ｂｉ，Ｆｅを含む比較銀粘土１および従来
銀粘土１に比べて優れた引張り強度を有するところか
ら、燒結性に優れていることがわかる。また、９００ｐ
ｐｍを越えてＳｎ，Ｐｂ，Ｃｕ，Ｂｉ，Ｆｅの内の１種
または２種以上を含有する比較銀粘土２は銀の品位が劣
るところから純銀製品と称して販売できないことがわか
る。From the results shown in Tables 1 and 2, Sn, P
one or more of b, Cu, Bi, and Fe: 20
The silver clays 1 to 11 of the present invention containing atomized silver powder having a composition consisting of Ag having a purity of 99% by weight or more containing 900 ppm by weight of Sn,
Compared to the comparative silver clay 1 containing Pb, Cu, Bi, and Fe, and the conventional silver clay 1, it has excellent tensile strength, indicating that the sinterability is excellent. Also, 900p
It can be seen that the comparative silver clay 2 containing one or more of Sn, Pb, Cu, Bi, and Fe exceeding pm cannot be sold as a pure silver product due to its poor silver quality.
【００２１】[0021]
【発明の効果】上述のように、この発明の銀粘土は、従
来よりも一層燒結性に優れており、より多くの人が銀粘
土を使用して簡単に短時間で美術工芸品および宝飾品を
つくることができるなど優れた効果を奏するものであ
る。As described above, the silver clay of the present invention is more excellent in sintering property than before, and more people can use silver clay easily and in a short time in arts and crafts and jewelry. It has excellent effects such as the ability to produce
Claims (6)
または２種以上を合計で２０〜９００ｐｐｍを含有し、
残部がＡｇおよび不可避不純物からなる組成の銀粉末か
らなることを特徴とする燒結性に優れた銀粘土用銀粉
末。(1) a total of 20 to 900 ppm of one or more of Sn, Pb, Cu, Bi, and Fe;
A silver powder for silver clay excellent in sinterability, characterized in that the balance comprises silver powder having a composition comprising Ag and unavoidable impurities.
とを特徴とする請求項１記載の燒結性に優れた銀粘土用
銀粉末。2. The silver powder for silver clay excellent in sinterability according to claim 1, wherein said silver powder is atomized silver powder.
５重量％、バインダ−：０．８〜８重量％を含有し、残
りが水からなることを特徴とする燒結性に優れた銀粘
土。3. A silver powder according to claim 1 or 2, wherein the silver powder is 50-9.
Silver clay excellent in sinterability, containing 5% by weight and a binder: 0.8 to 8% by weight, with the balance being water.
５重量％、バインダー：０．８〜８重量％、界面活性
剤：０．０３〜３重量％を含有し、残りが水からなるこ
とを特徴とする燒結性に優れた銀粘土。4. The silver powder according to claim 1 or 2, wherein the silver powder is 50-9.
An excellent sintering silver clay containing 5% by weight, a binder: 0.8 to 8% by weight, a surfactant: 0.03 to 3% by weight, and the remainder consisting of water.
５重量％、バインダー：０．８〜８重量％、油脂：０．
１〜３重量％を含有し、残りが水からなることを特徴と
する燒結性に優れた銀粘土。5. The silver powder according to claim 1 or 2, wherein the silver powder is 50-9.
5% by weight, binder: 0.8 to 8% by weight, fat: 0.
Silver sinter having excellent sintering properties, containing 1 to 3% by weight and the remainder consisting of water.
５重量％、バインダー：０．８〜８重量％、油脂：０．
１〜３重量％、界面活性剤：０．０３〜３重量％を含有
し、残りが水からなることを特徴とする燒結性に優れた
銀粘土。6. The silver powder according to claim 1 or 2, wherein the silver powder is 50-9.
5% by weight, binder: 0.8 to 8% by weight, fat: 0.
Silver clay excellent in sinterability, characterized in that it contains 1 to 3% by weight and surfactant: 0.03 to 3% by weight, and the remainder consists of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17220499A JP3687419B2 (en) | 1999-06-18 | 1999-06-18 | Silver powder for silver clay having excellent sintering properties and silver clay containing this silver powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17220499A JP3687419B2 (en) | 1999-06-18 | 1999-06-18 | Silver powder for silver clay having excellent sintering properties and silver clay containing this silver powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001003101A true JP2001003101A (en) | 2001-01-09 |
| JP3687419B2 JP3687419B2 (en) | 2005-08-24 |
Family
ID=15937526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17220499A Expired - Lifetime JP3687419B2 (en) | 1999-06-18 | 1999-06-18 | Silver powder for silver clay having excellent sintering properties and silver clay containing this silver powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3687419B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150034883A1 (en) * | 2012-02-13 | 2015-02-05 | Dowa Electronics Materials Co., Ltd. | Spherical silver powder and method for producing same |
| KR20240060587A (en) | 2022-10-27 | 2024-05-08 | 후쿠다 킨조쿠 하쿠훈 코교 가부시키가이샤 | Silver-based metal powder and method for producing the silver-based metal powder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5861872B2 (en) | 2012-01-10 | 2016-02-16 | 三菱マテリアル株式会社 | Silver powder for silver clay, method for producing silver powder for silver clay, and silver clay containing the silver powder |
-
1999
- 1999-06-18 JP JP17220499A patent/JP3687419B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150034883A1 (en) * | 2012-02-13 | 2015-02-05 | Dowa Electronics Materials Co., Ltd. | Spherical silver powder and method for producing same |
| US11424049B2 (en) * | 2012-02-13 | 2022-08-23 | Dowa Electronics Materials Co., Ltd. | Spherical silver powder and method for producing same |
| KR20240060587A (en) | 2022-10-27 | 2024-05-08 | 후쿠다 킨조쿠 하쿠훈 코교 가부시키가이샤 | Silver-based metal powder and method for producing the silver-based metal powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3687419B2 (en) | 2005-08-24 |
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