JPH05156325A - Production of fine metal powder - Google Patents
Production of fine metal powderInfo
- Publication number
- JPH05156325A JPH05156325A JP3324524A JP32452491A JPH05156325A JP H05156325 A JPH05156325 A JP H05156325A JP 3324524 A JP3324524 A JP 3324524A JP 32452491 A JP32452491 A JP 32452491A JP H05156325 A JPH05156325 A JP H05156325A
- Authority
- JP
- Japan
- Prior art keywords
- oxalate
- palladium
- copper
- nickel
- metal powder
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910001111 Fine metal Inorganic materials 0.000 title claims description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 17
- QYCVHILLJSYYBD-UHFFFAOYSA-L copper;oxalate Chemical compound [Cu+2].[O-]C(=O)C([O-])=O QYCVHILLJSYYBD-UHFFFAOYSA-L 0.000 claims abstract description 15
- DOLZKNFSRCEOFV-UHFFFAOYSA-L nickel(2+);oxalate Chemical compound [Ni+2].[O-]C(=O)C([O-])=O DOLZKNFSRCEOFV-UHFFFAOYSA-L 0.000 claims abstract description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract description 9
- 239000013078 crystal Substances 0.000 abstract description 4
- 150000008064 anhydrides Chemical class 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- PZKNFJIOIKQCPA-UHFFFAOYSA-N oxalic acid palladium Chemical compound [Pd].OC(=O)C(O)=O PZKNFJIOIKQCPA-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000005979 thermal decomposition reaction Methods 0.000 description 9
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 150000002940 palladium Chemical class 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000011164 primary particle Substances 0.000 description 3
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- OCDUIJZBRQQGHA-UHFFFAOYSA-L copper;oxalate;hydrate Chemical compound O.[Cu+2].[O-]C(=O)C([O-])=O OCDUIJZBRQQGHA-UHFFFAOYSA-L 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- VNYOIRCILMCTHO-UHFFFAOYSA-L nickel(2+);oxalate;dihydrate Chemical compound O.O.[Ni+2].[O-]C(=O)C([O-])=O VNYOIRCILMCTHO-UHFFFAOYSA-L 0.000 description 1
- 229910021508 nickel(II) hydroxide Inorganic materials 0.000 description 1
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 1
- VRBPDNIPYNKRCU-UHFFFAOYSA-N nickel;oxalic acid;hydrate Chemical compound O.[Ni].OC(=O)C(O)=O VRBPDNIPYNKRCU-UHFFFAOYSA-N 0.000 description 1
- -1 organic acid salt Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蓚酸銅又は蓚酸ニッケ
ルを熱分解して銅またはニッケル粉を製造する方法の改
良法に関し、より低温でより微細で比表面積の大きな、
凝集粒子径が10μｍ以下である銅またはニッケル粉の製
造法である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method for producing copper or nickel powder by thermally decomposing copper oxalate or nickel oxalate, which is finer at a lower temperature and has a large specific surface area.
This is a method for producing copper or nickel powder having an aggregate particle size of 10 μm or less.
【０００２】[0002]
【従来の技術】銅またはニッケルの微粉は、電解法、ア
トマイズ法、機械的粉砕、熱分解法などが知られ、主に
粉末冶金、超硬合金のバインダー、導電性フィラーなど
の用途に用いられている。これら方法は、粒子径がまた
かなり大きく、生産性や経済性に問題があった。2. Description of the Related Art Fine powder of copper or nickel is known to be electrolyzed, atomized, mechanically crushed, pyrolyzed, etc., and is mainly used for powder metallurgy, cemented carbide binder, conductive filler, etc. ing. These methods have a considerably large particle size and have problems in productivity and economy.
【０００３】一方、蓚酸塩などの熱分解によって各種金
属粉を製造する方法は簡便で、工業的規模においても実
施可能であり、比表面積の大きな或いは一次粒子径の小
さい微細金属粉が得られることが知られている。しか
し、この熱分解によって得られる金属粉は多孔質であっ
たり、凝集性が大きく、熱分解温度も比較的高温を必要
とするものであった。On the other hand, the method for producing various metal powders by thermal decomposition of oxalate is simple and can be carried out on an industrial scale, and fine metal powders having a large specific surface area or a small primary particle diameter can be obtained. It has been known. However, the metal powder obtained by this thermal decomposition is porous, has a large cohesive property, and requires a relatively high thermal decomposition temperature.
【０００４】[0004]
【発明が解決しようとする課題】本発明者等はこのよう
な事情に鑑み、蓚酸銅または蓚酸ニッケルの熱分解にお
いて、より低温でより微細な、凝集性のより小さい粒子
径の比較的揃った銅またはニッケル粉の製造法について
鋭意検討した結果、パラジウムを共存させる方法を見出
し本発明を完成させた。In view of such circumstances, the present inventors have found that in the thermal decomposition of copper oxalate or nickel oxalate, finer particles having a smaller cohesiveness at a lower temperature are relatively uniform. As a result of extensive studies on a method for producing copper or nickel powder, a method for coexisting palladium was found and the present invention was completed.
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明は、蓚
酸銅又は蓚酸ニッケルをパラジウムの存在下、減圧下或
いは非酸化性雰囲気下、 400℃以下の温度範囲において
0.5〜20℃/minの昇温速度で熱分解し、比表面積が 5〜
30 m2/g 、凝集粒子径が10μｍ以下の銅又はニッケル粉
を得ることを特徴とする微細金属粉の製造法であり、該
蓚酸銅又は蓚酸ニッケルが無水塩であること、該パラジ
ウムが該蓚酸銅又は蓚酸ニッケルに対して重量基準で 1
00〜4,000ppmであることからなる微細金属粉の製造法で
ある。Means for Solving the Problems That is, according to the present invention, copper oxalate or nickel oxalate is present in the presence of palladium under reduced pressure or in a non-oxidizing atmosphere in a temperature range of 400 ° C. or lower.
Pyrolyzes at a temperature rising rate of 0.5 to 20 ° C / min and has a specific surface area of 5 to
30 m 2 / g, a method for producing a fine metal powder characterized by obtaining a copper or nickel powder having an aggregate particle diameter of 10 μm or less, wherein the copper oxalate or nickel oxalate is an anhydrous salt, and the palladium is 1 by weight for copper oxalate or nickel oxalate
This is a method for producing fine metal powder, which consists of 00 to 4,000 ppm.
【０００６】以下、本発明について説明する。本発明の
蓚酸銅とは、無水蓚酸銅、蓚酸銅水和物或いはこれらの
混合物などであるが、凝集性の小さな銅粉を得るために
は、無水蓚酸銅が特に好ましい。また、蓚酸ニッケルと
は、無水蓚酸ニッケル、蓚酸ニッケル水和物或いはこれ
らの混合物などであるが、実質的に水を含まない条件下
に製造された無水蓚酸ニッケルが特に好ましい。The present invention will be described below. The copper oxalate of the present invention is anhydrous copper oxalate, copper oxalate hydrate or a mixture thereof, and anhydrous copper oxalate is particularly preferable in order to obtain a copper powder having a small cohesive property. The nickel oxalate is anhydrous nickel oxalate, nickel oxalate hydrate, or a mixture thereof, and the anhydrous nickel oxalate produced under the condition of substantially free of water is particularly preferable.
【０００７】熱分解にあたってパラジウムを共存させ
る。このパラジウムは、通常、パラジウム塩の形で使用
する。パラジウム塩としては、塩化パラジウム、酢酸パ
ラジウム、硝酸パラジウム、硫酸パラジウムなどが挙げ
られ、ハロゲン、硫黄、その他の不純物を残留させない
面からは酢酸パラジウムなどの比較的低温で分解する有
機酸塩が好適である。Palladium coexists in the thermal decomposition. This palladium is usually used in the form of a palladium salt. Examples of the palladium salt include palladium chloride, palladium acetate, palladium nitrate, palladium sulfate, and the like. From the viewpoint of not leaving halogen, sulfur, and other impurities, an organic acid salt such as palladium acetate that decomposes at a relatively low temperature is preferable. is there.
【０００８】上記において、パラジウムを共存させる方
法としては、機械的に混合して分散或いは付着させる方
法、本発明の蓚酸塩の製造工程中にパラジウム塩を添加
し、結晶中にパラジウムが内包されたものとして用いる
方法が挙げられる。より少量のパラジウムでより良好な
熱分解特性、より微細な金属粉を得る面から、結晶中に
パラジウムを含有させるのが好ましく、好適にはパラジ
ウムを重量で 100〜4,000 ppm の範囲で含む金属の蓚酸
塩結晶が好ましい。In the above, as a method of coexisting palladium, a method of mechanically mixing and dispersing or adhering, and a palladium salt was added during the production process of the oxalate of the present invention, the palladium was included in the crystal. The method used as a thing is mentioned. From the viewpoint of obtaining a better thermal decomposition property with a smaller amount of palladium and obtaining a finer metal powder, it is preferable to include palladium in the crystal, and preferably a metal containing palladium in a range of 100 to 4,000 ppm by weight is used. Oxalate crystals are preferred.
【０００９】本発明の金属の蓚酸塩の熱分解は、非酸化
性雰囲気中或いは減圧下に、昇温速度 0.5〜20℃/min
で、保持温度 400℃以下、好ましくは 200〜360 ℃の範
囲である。金属超微粉の一次粒子径、凝集粒子径は、熱
分解条件の影響を受ける。昇温速度が20℃/minを超える
場合には、一次粒子径、凝集粒子径ともに不揃いでより
大きなものとなるので好ましくない。The thermal decomposition of the metal oxalate of the present invention is carried out in a non-oxidizing atmosphere or under reduced pressure at a temperature rising rate of 0.5 to 20 ° C./min.
The holding temperature is 400 ° C or lower, preferably 200 to 360 ° C. The primary particle diameter and agglomerated particle diameter of the ultrafine metal powder are affected by the pyrolysis conditions. When the rate of temperature increase exceeds 20 ° C./min, both the primary particle diameter and the aggregate particle diameter become uneven and larger, which is not preferable.
【００１０】また、熱分解雰囲気は、得られる金属超微
粉の粒子径などに大きな影響を与えないので、操作が容
易な常圧付近の非酸化性雰囲気が好ましい。また減圧雰
囲気の場合、30mmHg以下の圧力範囲を保つのが好まし
い。以上の方法による本発明の微細金属粉は、通常、凝
集粒子径10μｍ以下、比表面積 5〜30m2/gの銅またはニ
ッケル粉である。Further, since the thermal decomposition atmosphere does not greatly affect the particle size of the obtained ultrafine metal powder, a non-oxidizing atmosphere in the vicinity of normal pressure is preferable because it is easy to operate. In the case of a reduced pressure atmosphere, it is preferable to keep the pressure range of 30 mmHg or less. The fine metal powder of the present invention obtained by the above method is usually a copper or nickel powder having an aggregate particle diameter of 10 μm or less and a specific surface area of 5 to 30 m 2 / g.
【００１１】この微細金属粉は、空気中での安定的な取
扱いのためには徐酸化（＝表面に極めて薄い緻密な酸化
膜を形成する方法）などを施して用いるのが好ましい。
また、特に不純物の含有量の少ないものが必要な場合に
は該金属粉を水、有機溶媒酸またはアルカリ溶液等を用
いて洗浄を行う工程、機械的に開催する工程、水素又は
ヒドラジン等をもちいる気相の還元工程を摘要すること
によって不純物を低減したものとすることが好ましい。The fine metal powder is preferably subjected to gradual oxidation (= method of forming an extremely thin and dense oxide film on the surface) and the like for stable handling in air.
Further, particularly when a material having a low content of impurities is required, it has a step of washing the metal powder with water, an organic solvent acid or alkali solution, a step of mechanically holding, hydrogen or hydrazine. It is preferable to reduce impurities by requiring a gas-phase reduction step.
【００１２】[0012]
【実施例】以下, 実施例などによって本発明をさらに具
体的に説明する。 実施例１ 市販の蓚酸ニッケル・２水和物 5g に酢酸パラジウム
0.01g(900ppm)を添加し、乳鉢で十分に混合した。これ
を減圧乾燥機中に入れ、1mmHg の減圧下に速度 2℃/min
で 260℃まで昇温し、30分間保持した。ついで室温まで
冷却した後、1.5gの粉末を取り出した。この粉体をＸ線
分析したところ、金属ニッケルであり、BET 法による比
表面積は 23 m2/g、レーザー方式による凝集粒子径は 6
μｍであった。EXAMPLES The present invention will be described in more detail with reference to the following examples. Example 1 Commercially available nickel oxalate dihydrate (5 g) and palladium acetate
0.01 g (900 ppm) was added and mixed well in a mortar. Place this in a vacuum dryer and apply a pressure of 1 mmHg at a speed of 2 ° C / min.
The temperature was raised to 260 ° C. and held for 30 minutes. Then, after cooling to room temperature, 1.5 g of powder was taken out. An X-ray analysis of this powder revealed that it was metallic nickel and had a specific surface area of 23 m 2 / g by the BET method and an aggregate particle size of 6 by the laser method.
was μm.
【００１３】比較例１ 実施例１において、酢酸パラジウムを使用せず、保持温
度を 300℃とする他は同様とした。この結果、凝集粒子
径 12 μｍ、比表面積 10 m2/gのニッケル粉末1.4g を
得た。Comparative Example 1 The same procedure as in Example 1 was carried out except that palladium acetate was not used and the holding temperature was 300 ° C. As a result, 1.4 g of nickel powder having an aggregate particle diameter of 12 μm and a specific surface area of 10 m 2 / g was obtained.
【００１４】実施例２ 市販の蓚酸銅・1/2 水和物 5g に酢酸パラジウム 0.01g
を添加し、乳鉢で十分に混合した。この混合物を使用す
る他は実施例１と同様にした。この結果、凝集粒子径 9
μｍ、比表面積 7 m2/gの銅粉末 1.8g を得た。Example 2 0.01 g of palladium acetate was added to 5 g of commercially available copper oxalate / 1/2 hydrate.
Was added and mixed well in a mortar. Same as Example 1 but using this mixture. As a result, the aggregate particle size 9
1.8 g of copper powder having a particle size of 7 μm and a specific surface area of 7 m 2 / g was obtained.
【００１５】実施例３ 蓚酸のエタノール溶液に新しい水酸化ニッケル(II)を加
えて、エタノール還流下に反応を行った蓚酸ニッケル 5
g に、酢酸パラジウム 0.01gを添加し、乳鉢で十分に混
合した。この混合物を使用する他は実施例１と同様にし
た。この結果、凝集粒子径 1.2μｍ、比表面積 24 m2/g
のニッケル粉を得た。Example 3 Nickel oxalate prepared by adding new nickel (II) hydroxide to an ethanol solution of oxalic acid and carrying out a reaction under reflux of ethanol.
0.01 g of palladium acetate was added to g and mixed well in a mortar. Same as Example 1 but using this mixture. As a result, aggregate particle size 1.2 μm, specific surface area 24 m 2 / g
Of nickel powder was obtained.
【００１６】[0016]
【発明の効果】以上、発明の詳細な説明、実施例、比較
例から明瞭なように、本発明の金属の蓚酸塩にパラジウ
ムを共存させて熱分解する銅またはニッケル粉の製造法
によれば、より低温で、凝集性が小さい微粉が容易に製
造可能であり、工業的に実用的な新規方法を提供するも
のでありその意義は極めて大きいものである。As is clear from the detailed description of the invention, the examples and the comparative examples above, according to the method for producing copper or nickel powder in which palladium is coexisted in the metal oxalate of the present invention for thermal decomposition. The present invention provides a novel industrially practical method that can easily produce fine powder having a low coagulability at a lower temperature, and its significance is extremely great.
Claims (3)
存在下、減圧下或いは非酸化性雰囲気下、 400℃以下の
温度範囲において 0.5〜20℃/minの昇温速度で熱分解
し、比表面積が 5〜30 m2/g 、凝集粒子径が10μｍ以下
の銅又はニッケル粉を得ることを特徴とする微細金属粉
の製造法1. A specific surface area is obtained by thermally decomposing copper oxalate or nickel oxalate in the presence of palladium under reduced pressure or in a non-oxidizing atmosphere at a temperature rising rate of 0.5 to 20 ° C./min in a temperature range of 400 ° C. or less. A method for producing fine metal powder, characterized in that copper or nickel powder having an aggregate particle diameter of 5 to 30 m 2 / g and an aggregate particle diameter of 10 μm or less is obtained.
る請求項１記載の微細金属粉の製造法2. The method for producing fine metal powder according to claim 1, wherein the copper oxalate or nickel oxalate is an anhydrous salt.
ルに対して重量基準で 100〜4,000ppmである請求項１ま
たは２記載の微細金属粉の製造法3. The method for producing a fine metal powder according to claim 1, wherein the palladium is 100 to 4,000 ppm on a weight basis with respect to the copper oxalate or the nickel oxalate.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3324524A JPH05156325A (en) | 1991-12-09 | 1991-12-09 | Production of fine metal powder |
| US07/862,218 US5250101A (en) | 1991-04-08 | 1992-04-02 | Process for the production of fine powder |
| EP92303131A EP0508757A1 (en) | 1991-04-08 | 1992-04-08 | Process for the production of fine powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3324524A JPH05156325A (en) | 1991-12-09 | 1991-12-09 | Production of fine metal powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05156325A true JPH05156325A (en) | 1993-06-22 |
Family
ID=18166765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3324524A Pending JPH05156325A (en) | 1991-04-08 | 1991-12-09 | Production of fine metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05156325A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011037150A1 (en) * | 2009-09-24 | 2011-03-31 | 住友金属鉱山株式会社 | Nickel powder and production method thereof |
| JP2012072418A (en) * | 2010-09-27 | 2012-04-12 | Yamagata Univ | Fine coated copper particles and method for producing the same |
| JP2016033260A (en) * | 2015-09-18 | 2016-03-10 | 国立大学法人山形大学 | Composite compound, and suspension |
-
1991
- 1991-12-09 JP JP3324524A patent/JPH05156325A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011037150A1 (en) * | 2009-09-24 | 2011-03-31 | 住友金属鉱山株式会社 | Nickel powder and production method thereof |
| JPWO2011037150A1 (en) * | 2009-09-24 | 2013-02-21 | 住友金属鉱山株式会社 | Nickel fine powder and method for producing the same |
| JP5626217B2 (en) * | 2009-09-24 | 2014-11-19 | 住友金属鉱山株式会社 | Nickel fine powder and method for producing the same |
| JP2012072418A (en) * | 2010-09-27 | 2012-04-12 | Yamagata Univ | Fine coated copper particles and method for producing the same |
| JP2016033260A (en) * | 2015-09-18 | 2016-03-10 | 国立大学法人山形大学 | Composite compound, and suspension |
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