JP4203727B2 - Silver clay for forming porous sintered bodies - Google Patents
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Description
【０００１】
【発明の属する技術分野】
この発明は、密度が極めて低く気孔率の高い軽量なスポンジ状の多孔質焼結体を作製するための多孔質焼結体形成用銀粘土およびその銀粘土の焼結方法に関するものである。
【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が、近年、銀粉末を含んだ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装飾品または美術工芸品を製造することができる。
【０００３】
前記従来の銀粘土は、純度：９９．９９質量％以上の高純度からなる平均粒径：３〜２０μｍの銀粉末：７０〜９５質量％、セルローズ系水溶性バインダー：０．８〜８質量％、油脂：０．１〜３質量％、界面活性剤：０．０３〜３質量％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（特許文献１参照）。
【０００４】
この特許文献１に記載の前記従来の銀粘土は、比較的高温で燒結する必要があるために高出力の電気炉を使用して焼結する必要があり、高出力の電気炉はある特定の場所に設置されているために銀粘土の造形体を高出力の電気炉の設置場所まで運搬し、そこで燒結しなければならなかった。そのために一般家庭にも設置することができる低出力で小型の電気炉を用いて手軽に銀の装飾品または美術工芸品を製造することのできる低温燒結可能な銀粘土が求められていた。かかる要望に答えるために一層低温で燒結することのできる銀粘土として、平均粒径：０．５〜１．５μｍのＡｇ微細粉末：１５〜５０質量％を含有し、残部が平均粒径：３〜２０μｍのＡｇ粉末からなる混合銀粉末を使用して作製した、
（ａ）混合銀粉末：７０〜９５質量％、有機系バインダ−：０．８〜８質量％を含有し、残りが水、
（ｂ）混合銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、界面活性剤：０．０３〜３質量％を含有し、残りが水、
（ｃ）混合銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、油脂：０．１〜３質量％を含有し、残りが水、または、
（ｄ）混合銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、油脂：０．１〜３質量％、界面活性剤：０．０３〜３質量％を含有し、残りが水からなる構成を有している低温燒結性に優れた銀粘土が提供されている（特許文献２参照）。
これら従来の銀粘土を造形して造形体を作製し、この造形体を燒結して得られた銀粘土焼結体は可能な限り高密度の焼結体となるように求められており、その焼結体の相対密度は通常８０％以上あった。
【０００５】
【特許文献１】
特開平４−２６７０７号公報
【特許文献２】
特開２００２−２４１８０２号公報
【０００６】
【発明が解決しようとする課題】
近年、衣服または身体に付ける装飾品はますます派手になり、それに伴ってますます大型の装飾品が求められているが、装飾品が大型化するにつれて重量が増大し、特にイヤリングなどの身体に直接付ける装飾品はその重さがネックとなって、その大型化に限界があった。
【０００７】
【課題を解決するための手段】
そこで、本発明者らは、軽量で大型の装飾品を作製することができる銀粘土を提供すべく研究を行った。その結果、
（イ）酸化銀粉末を混合した銀粘土を作製し、この銀粘土の造形体を燒結すると、温度が１６０℃以上に上昇した時点で焼結中に酸化銀粉末は反応式：２ＡｇＯ→２Ａｇ＋Ｏ2によって分解し、酸素が発生して極めて多孔質で軽量なスポンジ状の銀粘土焼結体が得られ、この銀粘土焼結体からなる装飾品は一層軽量化することができる、
（ロ）この軽量で多孔質な銀粘土焼結体を作製するための銀粘土は、酸化銀粉末のほかにさらに通常使用されるＡｇ粉末を混合した混合粉末を含むものであることが良く、この混合粉末は、酸化銀粉末が３０質量％以上（但し、１００質量％を除く）含有することが好ましい（この酸化銀粉末とＡｇ粉末の混合粉末を、以下、酸化銀含有銀粉末と称する）、
（ハ）前記酸化銀含有銀粉末に含まれる酸化銀粉末の平均粒径は５〜２０μｍの粒度を有することが好ましく、この酸化銀粉末と混合する通常のＡｇ粉末の平均粒径は１〜１０μｍの粒度を有することが好ましい、
（ニ）前記酸化銀含有銀粉末を使用して多孔質焼結体形成用銀粘土を製造するには、酸化銀含有銀粉末：７０〜９５質量％に、有機系バインダ−：０．８〜８質量％を含有させ、さらに必要に応じて界面活性剤：０．０３〜３質量％および油脂：０．１〜３質量％のうちの１種または２種を含有し、残りが水からなることが好ましい、
という知見を得たのである。
【０００８】
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）酸化銀粉末：３０質量％以上（但し、１００質量％を除く）を含有し、残部がＡｇ粉末からなる酸化銀含有銀粉末：７０〜９５質量％を含有し、さらに有機系バインダ−：０．８〜８質量％を含有し、残りが水からなる多孔質焼結体形成用銀粘土、
（２）前記酸化銀含有銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、界面活性剤：０．０３〜３質量％を含有し、残りが水からなる多孔質焼結体形成用銀粘土、
（３）前記酸化銀含有銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、油脂：０．１〜３質量％を含有し、残りが水からなる多孔質焼結体形成用銀粘土、
（４）前記酸化銀含有銀粉末：７０〜９５質量％、有機系バインダー：０．８〜８質量％、油脂：０．１〜３質量％、界面活性剤：０．０３〜３質量％を含有し、残りが水からなる多孔質焼結体形成用銀粘土、
（５）前記酸化銀含有銀粉末は、平均粒径：５〜２０μｍの酸化銀粉末と平均粒径：１〜１０μｍの銀粉末の混合粉末である前記（１）、（２），（３）または（４）記載の多孔質焼結体形成用銀粘土、に特徴を有するものである。
【０００９】
酸化銀粉末にＡｇ粉末を混合した酸化銀含有銀粉末を含む前記（１）〜（５）記載のこの発明の多孔質焼結体形成用銀粘土を造形し燒結しても多孔質な銀粘土焼結体が得られる。この場合、酸化銀粉末とＡｇ粉末の混合比率が異なった酸化銀含有銀粉末を使用することにより気孔率の異なった多孔質な銀粘土焼結体が得られ、酸化銀粉末の混合比率が低くなるほど気孔率の小さな銀粘土焼結体が得られる。
【００１０】
酸化銀粉末とＡｇ粉末の混合体からなる酸化銀含有銀粉末において酸化銀粉末は３０質量％以上を含有することが好ましい。酸化銀粉末の含有量が３０質量％未満である酸化銀含有銀粉末を含む銀粘土を使用して作製した多孔質焼結体は、界面活性剤を含む銀粘土で作製した多孔質焼結体に比べて気孔率が格別良くなることがないからである。
また、酸化銀粉末を平均粒径：５〜２０μｍの限定した理由は、平均粒径：５μｍ未満ではバインダー量が多くなり、造形性が悪化するので好ましくなく、一方、平均粒径：２０μｍを越えると、一粒の酸化銀粉末が分解して発生する酸素量が多くなって形成される空孔の大きさが不均一になるので好ましくないからである。さらに酸化銀含有銀粉末に含まれるＡｇ粉末は平均粒径：１〜１０μｍを有することが好ましく、このＡｇ粉末は最も広く市販されているものである。
【００１１】
この発明の多孔質焼結体形成用銀粘土に含まれる酸化銀含有銀粉末の量を７０〜９５質量％に限定したのは、７０質量％未満では得られた焼成体の十分な強度が得られずまた金属光沢を示すに十分な効果が得られないからであり、一方、９５質量％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り十分な造形性が得られなくなるので好ましくないからである。
【００１２】
この発明の多孔質焼結体形成用銀粘土に含まれる有機系バインダーは、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質量％未満では効果がなく、一方、８質量％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、この発明の多孔質焼結体形成用銀粘土に含まれるバインダーは、０．８〜８質量％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質量％である。
【００１３】
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質量％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。
【００１４】
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質量％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）、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。
【００１５】
この発明の多孔質焼結体形成用銀粘土を造形し燒結して多孔質銀粘土焼結体を作製するには、造形して得られた造形体をそのまま燒結することにより多孔質銀粘土焼結体を得ることができるが、この酸化銀粉末を含む銀粘土の造形体を燒結すると、焼結中に流動して型崩れが発生し、所定の形を有する銀粘土焼結体が得られないことがある。したがって、この発明の多孔質焼結体形成用銀粘土の造形体は鋳型のキャビティ内に充填した状態で燒結すると、キャビティ形状と同じ形状の銀粘土焼結体が得られる。前記鋳型は金型、石膏型、セラミック型、ロスとワックス型などいかなる鋳型を用いても良く、金型が最も量産に適しており、石膏型が最も簡単に製造できるが、この発明の多孔質焼結体形成用銀粘土の造形体は焼結中に酸化銀が還元されて酸素ガスが発生するので、鋳型にガス抜き穴を設けるか、連続気泡を有する多孔質材料からなる鋳型の中に充填した状態で燒結することが一層好ましい。
【００１６】
【発明の実施の形態】
【００１７】
実施例１
有機系バインダーとしてメチルセルローズ、界面活性剤、油脂としてオリーブ油および水を用意した。さらに表１に示される平均粒径を有する酸化銀粉末を用意し、さらに表１に示される平均粒径を有するアトマイズＡｇ粉末を用意した。前記酸化銀粉末に前記アトマイズＡｇ粉末を表１に示される割合で配合し混合して酸化銀含有銀粉末Ａ〜Ｋを作製した。
【００１８】
【表１】
表１の酸化銀含有銀粉末Ａ〜Ｋに先に用意したメチルセルローズ、界面活性剤、油脂としてオリーブ油および水を表２に示される割合で配合し混合して本発明銀粘土１〜７、比較銀粘土１〜３および従来銀粘土１を作製し、これら本発明銀粘土１〜７、比較銀粘土１〜３および従来銀粘土１を金型の縦：３ｍｍ、横：４ｍｍ、長さ：６５ｍｍの寸法を有するキャビティに充填して造形し、得られた造形体を金型に充填した状態のまま８００℃で３０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強さおよび密度を測定し、その測定結果を表２に示した。
【００２０】
【表２】
表１〜２に示される結果から、本発明銀粘土１〜７は表１〜２に示される従来銀粘土１に比べていずれも密度が格段に小さいにもかかわらず引張強度の低下が少ないところから、美術工芸品や宝飾品として使用可能な多孔質銀粘土焼結体が得られることが分かる。しかし、この発明の範囲から外れた比較銀粘土１〜３は、粘土として造形性が不良であったり、密度が低下しても引張り強さが極端に低下したり、さらには密度の低下が少ないなどの好ましくない特性が現れることが分かる。
【００２２】
【発明の効果】
上述のように、この発明の銀粘土は、従来銀粘土に比べて一層低密度の多孔質燒結体を製造することができ、より軽量で大型の美術工芸品や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。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silver clay for forming a porous sintered body for producing a lightweight sponge-like porous sintered body having an extremely low density and a high porosity, and a method for sintering the silver clay.
[0002]
[Prior art]
Silver jewelry or arts and crafts are generally manufactured by casting or forging. In recent years, silver clay containing silver powder is formed into a predetermined shape, sintered, and then silver jewelry or art having a predetermined shape. A method of manufacturing a craft has been proposed. According to this method, silver clay can be freely modeled in the same way as ordinary clay work, and the modeled body obtained by modeling is dried and then transported to the place where the sintering furnace is installed. Sintering makes it possible to produce silver ornaments or arts and crafts very easily.
[0003]
The conventional silver clay has a purity of 99.99% by mass or more and an average particle size of 3 to 20 μm, a silver powder of 70 to 95% by mass, and a cellulose water-soluble binder: 0.8 to 8% by mass. It is known that fats and oils: 0.1 to 3% by mass, surfactants: 0.03 to 3% by mass, and the remainder is water (see Patent Document 1).
[0004]
Since the conventional silver clay described in Patent Document 1 needs to be sintered at a relatively high temperature, it is necessary to sinter using a high-power electric furnace. Because it was installed at the site, the silver clay model had to be transported to the installation site of the high-power electric furnace and sintered there. Therefore, there has been a demand for a silver clay capable of low-temperature sintering that can easily produce silver ornaments or arts and crafts using a small electric furnace with low output that can be installed in ordinary households. As a silver clay that can be sintered at a lower temperature in order to respond to such a demand, it contains an Ag fine powder having an average particle size of 0.5 to 1.5 μm: 15 to 50% by mass, and the balance is an average particle size of 3 Made using a mixed silver powder consisting of ~ 20 μm Ag powder,
(A) Mixed silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, the remainder being water,
(B) Mixed silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, surfactant: 0.03 to 3% by mass, the remainder being water,
(C) Mixed silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, fats and oils: 0.1 to 3% by mass, the rest being water, or
(D) Mixed silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, fats and oils: 0.1 to 3% by mass, surfactant: 0.03 to 3% by mass, A silver clay excellent in low-temperature sintering properties having a structure composed of water is provided (see Patent Document 2).
A silver clay sintered body obtained by shaping these conventional silver clays to produce a modeled body and sintering this modeled body is required to be as high a density sintered body as possible. The relative density of the sintered body was usually 80% or more.
[0005]
[Patent Document 1]
JP-A-4-26707 [Patent Document 2]
JP-A-2002-241802 [0006]
[Problems to be solved by the invention]
In recent years, ornaments attached to clothes or the body have become more and more flashy, and accordingly, larger-sized ornaments have been demanded. However, as the ornaments have become larger, the weight has increased, especially for earrings and other bodies. The decorative items to be directly attached have a limitation in the size increase due to their weight.
[0007]
[Means for Solving the Problems]
Therefore, the present inventors have studied to provide a silver clay that can produce a lightweight and large decorative article. as a result,
(A) When silver clay mixed with silver oxide powder is prepared and the shaped body of this silver clay is sintered, the silver oxide powder reacts with the reaction formula: 2AgO → 2Ag + O 2 during sintering when the temperature rises to 160 ° C. or higher. Is decomposed and oxygen is generated to obtain a very porous and lightweight sponge-like silver clay sintered body, and a decorative article made of this silver clay sintered body can be further reduced in weight.
(B) a silver clay for making a porous metal clay sintered body in this light may be one that contains other further mixed powder of Ag powder normally used in silver oxide powder, the mixture The powder preferably contains 30% by mass or more (excluding 100% by mass) of silver oxide powder (this mixed powder of silver oxide powder and Ag powder is hereinafter referred to as silver oxide-containing silver powder).
(C) The average particle size of the silver oxide powder contained in the silver oxide-containing silver powder preferably has a particle size of 5 to 20 μm, and the average particle size of a normal Ag powder mixed with the silver oxide powder is 1 to 10 μm. Preferably have a particle size of
(D) To produce a silver clay for forming a porous sintered body using the silver oxide-containing silver powder, the silver oxide-containing silver powder: 70 to 95% by mass, the organic binder: 0.8 to 8% by mass is contained, and further, if necessary, one or two of surfactants: 0.03 to 3% by mass and fats and oils: 0.1 to 3% by mass are contained, and the remainder is made of water. Preferably,
I got this knowledge.
[0008]
This invention was made based on such knowledge,
( 1 ) Silver oxide powder: 30% by mass or more (excluding 100% by mass), with the remainder comprising Ag powder containing silver oxide: 70-95% by mass, and an organic binder : Silver clay for forming a porous sintered body containing 0.8 to 8% by mass, the balance being water,
( 2 ) The above-mentioned silver oxide-containing silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, surfactant: 0.03 to 3% by mass, and the remainder comprising water Silver clay for forming sintered bodies,
( 3 ) Porous sintering comprising the silver oxide-containing silver powder: 70 to 95% by mass, organic binder: 0.8 to 8% by mass, fats and oils: 0.1 to 3% by mass, and the rest comprising water. Silver clay for body formation,
(4) the silver oxide-containing silver powder: 70 to 95 wt%, organic binder: 0.8 to 8 wt%, fat: 0.1 to 3 wt%, surfactant: a 0.03 to 3 wt% Containing silver clay for forming a porous sintered body, the balance being water,
( 5 ) The silver oxide-containing silver powder is a mixed powder of a silver oxide powder having an average particle diameter of 5 to 20 μm and a silver powder having an average particle diameter of 1 to 10 μm ( 1 ), ( 2 ), ( 3 ) Or, it is characterized by the silver clay for forming a porous sintered body described in ( 4 ).
[0009]
Porous silver clay even if the silver clay for forming a porous sintered body according to the present invention described in the above (1) to (5) is formed and sintered, including silver oxide-containing silver powder obtained by mixing silver powder with Ag powder. A sintered body is obtained. In this case, a porous silver clay sintered body with different porosity can be obtained by using silver oxide-containing silver powder having different mixing ratios of silver oxide powder and Ag powder, and the mixing ratio of silver oxide powder is low. A silver clay sintered body having a small porosity can be obtained.
[0010]
In the silver oxide-containing silver powder composed of a mixture of silver oxide powder and Ag powder, the silver oxide powder preferably contains 30% by mass or more. A porous sintered body produced using a silver clay containing silver oxide-containing silver powder having a silver oxide powder content of less than 30% by mass is a porous sintered body produced from silver clay containing a surfactant. This is because the porosity is not significantly improved as compared with the above.
Further, the reason for limiting the average particle diameter of silver oxide powder to 5 to 20 μm is that the average particle diameter is less than 5 μm, which is not preferable because the amount of binder increases and the formability deteriorates. On the other hand, the average particle diameter exceeds 20 μm. This is because the amount of oxygen generated by the decomposition of one grain of silver oxide powder increases and the size of the vacancies formed is not uniform, which is not preferable. Further, the Ag powder contained in the silver oxide-containing silver powder preferably has an average particle diameter of 1 to 10 μm, and this Ag powder is the most widely commercially available.
[0011]
The amount of the silver oxide-containing silver powder contained in the silver clay for forming a porous sintered body of the present invention is limited to 70 to 95% by mass. If the amount is less than 70% by mass , sufficient strength of the obtained fired body is obtained. It is not also is because a sufficient effect can not be obtained in exhibiting metallic luster, whereas, elongation and strength can not-than sufficient molding property is obtained so as to reduce as clay when the content exceeds 95 wt% This is because it is not preferable.
[0012]
The organic binder contained in the silver clay for forming a porous sintered body of the present invention may be any binder such as a cellulose binder, a polyvinyl binder, an acrylic binder, a wax binder, a resin binder, starch, gelatin, and wheat flour. Although it may be used, a cellulosic binder, particularly water-soluble cellulose is most preferred. These binders are added in order to quickly gel when heated to facilitate the shape retention of the shaped body. However, the amount added is less than 0.8% by mass, while there is no effect, while the content exceeds 8% by mass. Then, fine cracks are generated in the obtained shaped body, and gloss is also reduced, which is not preferable. Therefore, the binder contained in the silver clay for forming a porous sintered body of the present invention is set to 0.8 to 8% by mass. A more preferable range of the binder content is 0.8 to 5% by mass.
[0013]
The surfactant is added as necessary, and the amount added is preferably 0.03 to 3% by mass. Moreover, the kind of surfactant to add is not specifically limited, A normal surfactant can be used.
[0014]
The fats and oils are also added as necessary, and the amount added is preferably 0.1 to 3% by mass. Fats and oils to be added are organic acids (oleic acid, stearic acid, phthalic acid, palmitic acid, sepacic acid, acetylcitric acid, hydroxybenzoic acid, lauric acid, myristic acid, caproic acid, enanthic acid, butyric acid, capric acid), organic acid Esters (organic acid esters having methyl, ethyl, propyl, butyl, octyl, hexyl, dimethyl, diethyl, isopropyl, and isobutyl groups), higher alcohols (octanol, nonanol, decanol), polyvalent Examples include alcohol (glycerin, arabit, sorbitan), ether (dioctyl ether, didecyl ether) and the like.
[0015]
In order to produce a porous silver clay sintered body by shaping and sintering the porous sintered body forming silver clay of the present invention, the porous silver clay sintered body is obtained by sintering the shaped body obtained by shaping as it is. A sintered body can be obtained, but when a silver clay shaped body containing this silver oxide powder is sintered, it flows during sintering and loses its shape, and a silver clay sintered body having a predetermined shape is obtained. There may not be. Therefore, when the shaped body of the silver clay for forming a porous sintered body of the present invention is sintered in a state of being filled in the cavity of the mold, a silver clay sintered body having the same shape as the cavity shape is obtained. The mold may be any mold such as a mold, a gypsum mold, a ceramic mold, a loss and a wax mold, the mold is most suitable for mass production, and the gypsum mold can be most easily manufactured. The silver clay shaped body for forming a sintered body is reduced in silver oxide during the sintering process to generate oxygen gas. Therefore, a vent hole is provided in the mold, or a mold made of a porous material having open cells is used. More preferably, it is sintered in a filled state.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
[0017]
Example 1
Methyl cellulose as an organic binder, a surfactant, and olive oil and water as fats and oils were prepared. Furthermore, the silver oxide powder which has the average particle diameter shown in Table 1 was prepared, and also the atomized Ag powder which has the average particle diameter shown in Table 1 was prepared. The atomized Ag powder was blended in the silver oxide powder at a ratio shown in Table 1 and mixed to prepare silver oxide-containing silver powders A to K.
[0018]
[Table 1]
The present invention silver clays 1 to 7 are prepared by mixing and mixing methyl cellulose prepared in advance in the silver oxide-containing silver powders A to K of Table 1, surfactants, olive oil and water as fats and oils in the proportions shown in Table 2. Silver clays 1 to 3 and conventional silver clay 1 were prepared, and these silver clays 1 to 7 of the present invention, comparative silver clays 1 to 3 and conventional silver clay 1 were made to have a mold length of 3 mm, a width of 4 mm, and a length of 65 mm. By filling a cavity having the following dimensions and shaping, and molding the obtained shaped body for 30 minutes at 800 ° C. while filling the mold, the dimensions of length: 3 mm, width: 4 mm, length: 65 mm are obtained. The test piece sintered body was prepared, the tensile strength and density of the obtained test piece sintered body were measured, and the measurement results are shown in Table 2 .
[0020]
[Table 2]
From the results shown in Tables 1 and 2 , the present invention silver clays 1 to 7 are less reduced in tensile strength than the conventional silver clays 1 shown in Tables 1 and 2 although the density is much smaller. Thus, it can be seen that a porous silver clay sintered body that can be used as an art craft or jewelry can be obtained. However, the comparative silver clays 1 to 3 that are out of the scope of the present invention have poor formability as clay, the tensile strength is extremely reduced even when the density is lowered, and the density is not lowered much. It can be seen that undesirable characteristics such as
[0022]
【The invention's effect】
As described above, the silver clay of the present invention can produce a porous sintered body having a lower density than conventional silver clay, and can make lighter and larger arts and crafts and jewelry. It has an excellent effect.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2003087140A JP4203727B2 (en) | 2003-03-27 | 2003-03-27 | Silver clay for forming porous sintered bodies |
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| JP2003087140A JP4203727B2 (en) | 2003-03-27 | 2003-03-27 | Silver clay for forming porous sintered bodies |
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| JP4203727B2 true JP4203727B2 (en) | 2009-01-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7201888B2 (en) * | 2003-10-07 | 2007-04-10 | Ferro Corporation | Nanosized silver oxide powder |
| JP2009214346A (en) * | 2008-03-07 | 2009-09-24 | Mitsubishi Plastics Inc | Mold release film |
| EP2283951A1 (en) * | 2008-05-28 | 2011-02-16 | Aida Chemical Industries Co., Ltd. | Composition for precious metal sintering, process for producing precious metal sinter and precious metal sinter |
| WO2011125244A1 (en) | 2010-04-09 | 2011-10-13 | 三菱マテリアル株式会社 | Clay-like composition for forming a sintered object, powder for a clay-like composition for forming a sintered object, method for manufacturing a clay-like composition for forming a sintered object, sintered silver object, and method for manufacturing a sintered silver object |
| JP5672945B2 (en) * | 2010-07-27 | 2015-02-18 | 三菱マテリアル株式会社 | Clay-like composition for forming sintered body, powder for clay-like composition for forming sintered body, method for producing clay-like composition for forming sintered body, silver sintered body, and method for producing silver sintered body |
| CN110039041A (en) * | 2019-04-22 | 2019-07-23 | 依波精品（深圳）有限公司 | Antibacterial stainless steel composite powder, antibacterial stainless steel and preparation method thereof |
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