JP3716350B2 - Silver powder and method for producing the same - Google Patents
Silver powder and method for producing the same Download PDFInfo
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- JP3716350B2 JP3716350B2 JP34107594A JP34107594A JP3716350B2 JP 3716350 B2 JP3716350 B2 JP 3716350B2 JP 34107594 A JP34107594 A JP 34107594A JP 34107594 A JP34107594 A JP 34107594A JP 3716350 B2 JP3716350 B2 JP 3716350B2
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- silver
- palladium
- silver powder
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- ammine complex
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims description 94
- 238000004519 manufacturing process Methods 0.000 title description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 78
- 229910052709 silver Inorganic materials 0.000 claims description 39
- 239000004332 silver Substances 0.000 claims description 39
- 229910052763 palladium Inorganic materials 0.000 claims description 35
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 18
- 230000005012 migration Effects 0.000 claims description 16
- 238000013508 migration Methods 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 238000000151 deposition Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine hydrate Chemical compound O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- OGFYIDCVDSATDC-UHFFFAOYSA-N silver silver Chemical compound [Ag].[Ag] OGFYIDCVDSATDC-UHFFFAOYSA-N 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
Images
Description
【０００１】
【産業上の利用分野】
本発明は、厚膜導電性ペーストに使用される銀粉及びその製造方法に関するものである。
【０００２】
【従来の技術】
従来から電子工業の分野で厚膜回路に銀ペーストが利用されており、その製造方法として多種の技術が提案されている。
【０００３】
銀ペーストは、銀−パラジウムペーストが主流であり、パラジウムを混合させる目的は、マイグレーションを防止するためである。
【０００４】
従来から提案されている技術としては、
（１）銀粉とパラジウム粉を混合したもの。
（２）銀−パラジウムの共沈粉。
（３）銀粉表面にパラジウムを被覆したもの。
（４）パラジウムを均一に分散させるため合金粉にしたもの。
等がある。
【０００５】
しかしながら、上記（１）〜（２）の各技術とも、次のような問題点があった。即ち、上記の
（１）は均一性に乏しいこと。
（２）はパラジウムの低減化の効果が少ないこと。
（３）は銀粉との密着性が悪く、剥離現象を起こし、また偏析してしまうので、被覆が不完全であること。
（４）マイグレーションは粉粒体の表面での反応が問題であり、合金化することにより抵抗が高くなってしまうこと。
等の致命的な欠点がある。
【０００６】
【発明が解決しようとする課題】
本発明は、上記のような従来技術の諸欠点を解決し、高価なパラジウムの減量化が可能で、しかも耐マイグレーション性を向上させることができ、かつ安価な銀−パラジウム膜を被覆した銀粉とその製造方法を提案するものである。
【０００７】
【課題を解決するための手段】
本発明は、上記のような課題を解決するため鋭意研究の結果、ペースト用の銀粉として均一に密着性よく銀粉にパラジウムを被覆させるためには、銀粉にパラジウム−銀膜を被覆することが非常に効果的であるとの知見を得てなされたものである。即ち
【０００８】
第１発明は、銀アンミン錯体水溶液に還元剤を添加して銀粉の粒子を生成し、次いでパラジウムのアンミン錯体と銀アンミン錯体とを添加し、更に還元剤を添加して、該錯体中のパラジウムと銀とを該銀粉の粒子の表面にパラジウム−銀膜として銀粉全体中においてパラジウム０．１〜２０ｗｔ％，銀０．００５〜２ｗｔ％の範囲で析出させることにより製造されるパラジウム−銀膜で被覆され耐マイグレーション性に優れたペースト用銀粉である。
【０００９】
第２発明は、銀アンミン錯体水溶液に還元剤を添加して銀粉の粒子を生成し、次いでパラジウムのアンミン錯体と銀アンミン錯体とを添加し、更に還元剤を添加して、該錯体中のパラジウムと銀とを該銀粉の粒子の表面にパラジウム−銀膜として銀粉全体中においてパラジウム０．１〜２０ｗｔ％，銀０．００５〜２ｗｔ％の範囲で析出させることを特徴とするパラジウム−銀膜で被覆され耐マイグレーション性に優れたペースト用銀粉の製造方法である。
【００１０】
第３発明は、銀アンミン錯体水溶液に還元剤を添加して銀粉を生成し、次いでパラジウムアンミン錯体と銀アンミン錯体とを添加し、更に還元剤を添加して、該錯体中のパラジウムと銀とを該銀粉の粒子表面に析出させることを特徴とするパラジウム−銀膜で被覆され耐マイグレーション性に優れる銀粉の製造方法であり、
【００１１】
第４発明は、パラジウム−銀膜で被覆され耐マイグレーション性に優れることを特徴とするペースト用銀粉である。
【００１２】
本発明において、銀粉は純銀に限定されるものではなく、他の金属を含有する銀合金粉も含まれるものである。以下、これらも単に銀粉という。
【００１３】
そして、パラジウム−銀膜中のパラジウム及び銀は、被覆された銀粉全体中において、それぞれ０．１〜２０ｗｔ％、０．００５〜２ｗｔ％の範囲が好ましいのである。
【００１４】
【作用】
本発明に係る製造方法においては、銀アンミン錯体水溶液に攪拌しながら還元剤を添加して銀粉を生成させた後、パラジウムアンミン錯体と銀アンミン錯体の水溶液を加え、更に還元剤を添加する。
【００１５】
還元剤の添加に際し、銀アンミン錯体水溶液に還元剤を銀の還元析出生成反応に必要な適量を添加し、次いでパラジウムアンミン錯体と銀アンミン錯体の水溶液を加え、次工程で更に還元剤を添加し、錯体中のパラジウムと銀とを銀粉粒子表面に析出生成させて被覆してもよく（図１参照）、またあらかじめ銀の還元析出生成工程で過剰の還元剤を添加しておき、パラジウムアンミン錯体と銀アンミン錯体の水溶液を加え、パラジウム−銀膜を銀粉粒子表面に析出させて被覆してもよい。
【００１６】
これらの析出生成反応により、銀粉粒子表面に均一で密着性のよいパラジウム−銀膜を被覆させることができる。
【００１７】
また、あらかじめ準備しておいた銀粉をパラジウムアンミン錯体と銀アンミン錯体との混合水溶液中に添加し、分散させて攪拌し、還元剤を所定量添加する方法によっても、上記と同様にパラジウム−銀膜を均一に密着性よく銀粉粒子表面に被覆することができる。
【００１８】
本発明に使用する還元剤としては、水素化ホウ素ナトリウム，ホルマリン，ヒビドラジン等のうち少なくとも一種であることが好ましいのである。
【００１９】
次に、本発明を実施例、比較例及び試験例に基づいて説明する。
【００２０】
【実施例】
実施例
硝酸銀１００ｇ／ｌの水溶液に適量のアンモニア水を加え、銀アンミン錯体水溶液を作成し、この水溜液に攪拌しながら還元剤としてホルマリンを添加して還元させ、銀粉粒子を析出生成させた。
【００２１】
この銀粉粒子を懸濁させた水溶液にパラジウムアンミン錯体（Ｐｄ：１４．５％）と銀アンミン錯体（Ａｇ：０．５％）の混合水溶液を添加し、還元剤としてヒドラジン・一水和物を加え、銀粉粒子表面にパラジウム−銀膜を析出させた。
【００２２】
析出生成反応後ろ過して、析出物を洗浄した後、６０℃で真空乾燥を行った。一方、反応ろ液を分析した結果、パラジウム及び銀は検出されなかった（図１参照）。
【００２３】
比較例１
銀粉粒子の析出生成は実施例１と同様にして行った後、この水溶液にパラジウムアンミン錯体（Ｐｄ：１５％）水溶液を添加し、還元剤としてヒドラジン・一水和物を加え、銀粉粒子表面にパラジウムを析出させた。
【００２４】
析出生成反応後ろ過し、析出物を洗浄した後、６０℃で真空乾燥を行った。一方、反応ろ液を分析した結果、パラジウムは検出されなかった。
【００２５】
比較例２
銀アンミン錯体（Ａｇ：８５ｗｔ％）水溶液とパラジウムアンミン錯体（Ｐｄ：１５ｗｔ％）水溶液を混合し、攪拌しながら還元剤としてヒドラジン・一水和物を添加し、共沈粉を析出生成させた。
【００２６】
反応後ろ過し、共沈物を充分洗浄した後、６０℃で真空乾燥を行った。一方、反応ろ液を分析した結果、パラジウム及び銀は検出されなかった。
【００２７】
比較例３
比較試験のため、銀粉８５ｗｔ％とパラジウム粉１５ｗｔ％を混合した混合粉を作成した。
【００２８】
試験例
上記実施例１と比較例１，２，３で製造した各銀粉で、下記組成のペーストを調整し、耐マイグレーション性につき試験を行った。
【００２９】
粉体：６１：０ｗｔ％，ビヒクル：３７．４ｗｔ％，ガラス粉１．６ｗｔ％（ただし、ビヒクルはエチルセルローズ４５ｃｐ：４．３ｗｔ％にターピネオール：９５．７ｗｔ％を混合し調製したもの）
【００３０】
次に、上記ペーストを用い、スクリーン印刷により電極パターンをアルミナ基板へ印刷し、レベリングを行い、所定の温度で乾燥した。その後、ベルト炉に装入し、８５０℃で焼成して電極を形成させた。その各電極のパターンは、Ｇａｐ：１ｍｍ，電極幅：１ｍｍであった。
【００３１】
実施例１の銀粉をベースとして形成した電極をＡ、比較例１の銀粉をベースとして形成した電極をＢ、以下同様に比較例２はＣ、比較例３はＤとして、マイグレーション測定を行った。
【００３２】
マイグレーション測定には図２に示すような回路（電源：ＤＣ：７．５Ｖ）を製作した。また、測定方法は、銀電極の間に純水を１滴滴下してから、抵抗の両端電圧が２Ｖになるまでの時間を測定した。
【００３３】
その結果、Ａ：２３秒，Ｂ：２０秒，Ｃ：１３秒，Ｄ：８秒であった。
【００３４】
以上の結果から、Ａ即ち本発明に係る銀粉粒子表面にパラジウム−銀膜を被覆した銀粉が、耐マイグレーション性に著しく優れていることが分った。
【００３５】
【発明の効果】
上記のように、本発明に係るパラジウム−銀膜を被覆した銀粉は、従来の銀粉に比較して、耐マイグレーション性に著しく優れており、特に厚腹導電性ペースト用として最適な銀粉である。
【００３６】
本発明法により、上記のような厚膜導電性ペーストに使用される銀粉として、密着性がよく、均一にパラジウム−銀膜を被覆した銀粉を比較的簡単な工程でしかも安価に製造することができる。
【００３７】
その結果、耐マイグレーション性に優れた効果が認められ、パラジウムを減量化することができ、従って経済性に優れたペースト用の銀粉を製造することができるのである。
【図面の簡単な説明】
【図１】本発明に係る銀粉の製造工程の一例を示す説明的概略製造工程図である。
【図２】本発明に係る銀粉等のマイグレーション測定用の回路説明図である。
【符号の説明】
１−電極パターン
２−ボルトメータ
３−抵抗[0001]
[Industrial application fields]
The present invention relates to a silver powder used for a thick film conductive paste and a method for producing the same.
[0002]
[Prior art]
Conventionally, silver paste has been used for thick film circuits in the field of the electronics industry, and various techniques have been proposed as manufacturing methods thereof.
[0003]
The silver paste is mainly a silver-palladium paste, and the purpose of mixing the palladium is to prevent migration.
[0004]
Conventionally proposed technologies include:
(1) A mixture of silver powder and palladium powder.
(2) Silver-palladium coprecipitated powder.
(3) The surface of silver powder coated with palladium.
(4) Alloy powder for uniformly dispersing palladium.
Etc.
[0005]
However, each of the techniques (1) to (2) has the following problems. That is, (1) above is poor in uniformity.
(2) has little effect of reducing palladium.
(3) is poor in adhesion to silver powder, causes a peeling phenomenon, and segregates, so that the coating is incomplete.
(4) Migration has a problem of reaction on the surface of the granular material, and resistance is increased by alloying.
There are fatal drawbacks.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned disadvantages of the prior art, can reduce the amount of expensive palladium, can improve migration resistance, and is coated with an inexpensive silver-palladium film. The manufacturing method is proposed.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present invention is very likely to coat palladium powder with a silver-silver film in order to uniformly coat silver powder with good adhesion as silver powder for paste. It was made with the knowledge that it was effective. That is, [0008]
In the first invention, a reducing agent is added to an aqueous silver ammine complex solution to produce silver powder particles, then an palladium ammine complex and a silver ammine complex are added, and a reducing agent is further added to form palladium in the complex. A palladium-silver film produced by depositing silver and silver on the surface of the silver powder particles as a palladium-silver film in the range of 0.1 to 20 wt% palladium and 0.005 to 2 wt% silver in the entire silver powder A silver powder for paste that is coated and has excellent migration resistance.
[0009]
In the second invention, a reducing agent is added to an aqueous silver ammine complex solution to produce silver powder particles, then an palladium ammine complex and a silver ammine complex are added, and a reducing agent is further added to form palladium in the complex. A palladium-silver film characterized in that palladium and silver are deposited as palladium-silver films on the surface of the silver powder particles in a range of 0.1 to 20 wt% palladium and 0.005 to 2 wt% silver in the entire silver powder. This is a method for producing silver powder for paste which is coated and has excellent migration resistance.
[0010]
In the third invention, a reducing agent is added to an aqueous silver ammine complex solution to produce silver powder, then a palladium ammine complex and a silver ammine complex are added, and a reducing agent is further added to add palladium and silver in the complex. Is a method for producing silver powder which is coated with a palladium-silver film and has excellent migration resistance, characterized in that it is precipitated on the particle surface of the silver powder.
[0011]
A fourth invention is a silver powder for paste, which is coated with a palladium-silver film and has excellent migration resistance.
[0012]
In the present invention, the silver powder is not limited to pure silver, but also includes silver alloy powder containing other metals. Hereinafter, these are also simply referred to as silver powder.
[0013]
The palladium and silver in the palladium-silver film are preferably in the range of 0.1 to 20 wt% and 0.005 to 2 wt%, respectively, in the entire coated silver powder.
[0014]
[Action]
In the production method according to the present invention, a reducing agent is added to an aqueous silver ammine complex solution while stirring to produce silver powder, an aqueous solution of a palladium ammine complex and a silver ammine complex is added, and a reducing agent is further added.
[0015]
When adding the reducing agent, add an appropriate amount of reducing agent to the silver ammine complex aqueous solution necessary for the reduction precipitation reaction of silver, then add the aqueous solution of palladium ammine complex and silver ammine complex, and then add the reducing agent in the next step. In addition, palladium and silver in the complex may be deposited on the surface of the silver powder particles and coated (see FIG. 1), or an excessive reducing agent may be added in advance in the silver reduction precipitation forming step to form a palladium ammine complex. And an aqueous solution of a silver ammine complex may be added to deposit a palladium-silver film on the surface of the silver powder particles.
[0016]
By these precipitation formation reactions, the surface of the silver powder particles can be coated with a uniform palladium-silver film having good adhesion.
[0017]
Also, palladium-silver can be obtained in the same manner as described above by adding silver powder prepared in advance to a mixed aqueous solution of palladium ammine complex and silver ammine complex, dispersing and stirring, and adding a predetermined amount of reducing agent. The film can be uniformly coated on the surface of the silver powder particles with good adhesion.
[0018]
The reducing agent used in the present invention is preferably at least one of sodium borohydride, formalin, hydrazine and the like.
[0019]
Next, this invention is demonstrated based on an Example, a comparative example, and a test example.
[0020]
【Example】
Example An appropriate amount of ammonia water was added to an aqueous solution of silver nitrate 100 g / l to prepare an aqueous silver ammine complex solution, and formalin was added and reduced as a reducing agent while stirring in this water reservoir to precipitate and form silver powder particles.
[0021]
A mixed aqueous solution of a palladium ammine complex (Pd: 14.5%) and a silver ammine complex (Ag: 0.5%) is added to the aqueous solution in which the silver powder particles are suspended, and hydrazine monohydrate is added as a reducing agent. In addition, a palladium-silver film was deposited on the surface of the silver powder particles.
[0022]
After the precipitation reaction, the precipitate was filtered to wash the precipitate, followed by vacuum drying at 60 ° C. On the other hand, as a result of analyzing the reaction filtrate, palladium and silver were not detected (see FIG. 1).
[0023]
Comparative Example 1
Precipitation and generation of silver powder particles were carried out in the same manner as in Example 1. Then, an aqueous solution of palladium ammine complex (Pd: 15%) was added to this aqueous solution, hydrazine monohydrate was added as a reducing agent, and the surface of the silver powder particles was added. Palladium was precipitated.
[0024]
After the precipitate formation reaction, filtration was performed, and the precipitate was washed, and then vacuum dried at 60 ° C. On the other hand, as a result of analyzing the reaction filtrate, palladium was not detected.
[0025]
Comparative Example 2
A silver ammine complex (Ag: 85 wt%) aqueous solution and a palladium ammine complex (Pd: 15 wt%) aqueous solution were mixed, and hydrazine monohydrate was added as a reducing agent while stirring to precipitate a coprecipitated powder.
[0026]
After the reaction, the mixture was filtered and the coprecipitate was sufficiently washed, followed by vacuum drying at 60 ° C. On the other hand, as a result of analyzing the reaction filtrate, palladium and silver were not detected.
[0027]
Comparative Example 3
For comparison test, a mixed powder in which 85 wt% of silver powder and 15 wt% of palladium powder were mixed was prepared.
[0028]
Test Example A paste having the following composition was prepared with each silver powder produced in Example 1 and Comparative Examples 1, 2, and 3, and the migration resistance was tested.
[0029]
Powder: 61: 0 wt%, Vehicle: 37.4 wt%, Glass powder 1.6 wt% (However, the vehicle was prepared by mixing ethyl cellulose 45 cp: 4.3 wt% with terpineol: 95.7 wt%)
[0030]
Next, using the paste, an electrode pattern was printed on an alumina substrate by screen printing, leveled, and dried at a predetermined temperature. Then, it inserted in the belt furnace and baked at 850 degreeC and the electrode was formed. The pattern of each electrode was Gap: 1 mm and electrode width: 1 mm.
[0031]
Migration measurement was carried out with the electrode formed on the basis of the silver powder of Example 1 as A, the electrode formed on the basis of the silver powder of Comparative Example 1 as B, the comparison example 2 as C and the comparison example 3 as D.
[0032]
For migration measurement, a circuit (power supply: DC: 7.5 V) as shown in FIG. 2 was manufactured. Moreover, the measuring method measured time until 1 drop of pure water was dripped between silver electrodes, and the both-ends voltage of resistance became 2V.
[0033]
As a result, A: 23 seconds, B: 20 seconds, C: 13 seconds, and D: 8 seconds.
[0034]
From the above results, it was found that A, that is, the silver powder in which the surface of the silver powder according to the present invention was coated with a palladium-silver film was remarkably excellent in migration resistance.
[0035]
【The invention's effect】
As described above, the silver powder coated with the palladium-silver film according to the present invention is remarkably excellent in migration resistance as compared with the conventional silver powder, and is an optimum silver powder particularly for a thick stomach conductive paste.
[0036]
According to the method of the present invention, as a silver powder used in the thick film conductive paste as described above, it is possible to produce a silver powder having good adhesion and uniformly covering a palladium-silver film in a relatively simple process and at a low cost. it can.
[0037]
As a result, an effect excellent in migration resistance is recognized, palladium can be reduced, and therefore silver powder for pastes excellent in economic efficiency can be produced.
[Brief description of the drawings]
FIG. 1 is an explanatory schematic production process diagram showing an example of a production process of silver powder according to the present invention.
FIG. 2 is an explanatory diagram of a circuit for measuring migration of silver powder or the like according to the present invention.
[Explanation of symbols]
1-electrode pattern 2-voltmeter 3-resistance
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34107594A JP3716350B2 (en) | 1994-12-28 | 1994-12-28 | Silver powder and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34107594A JP3716350B2 (en) | 1994-12-28 | 1994-12-28 | Silver powder and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08188804A JPH08188804A (en) | 1996-07-23 |
| JP3716350B2 true JP3716350B2 (en) | 2005-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34107594A Expired - Fee Related JP3716350B2 (en) | 1994-12-28 | 1994-12-28 | Silver powder and method for producing the same |
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| JP4583147B2 (en) * | 2004-11-19 | 2010-11-17 | 三井金属鉱業株式会社 | Conductive composite powder and method for producing the same |
| CN102407341B (en) * | 2011-10-27 | 2015-04-01 | 浙江光达电子科技有限公司 | surface modified particle diameter mixed silver powder and preparation method thereof |
| CN106825603B (en) * | 2016-12-31 | 2018-11-02 | 西安交通大学青岛研究院 | A kind of preparation method of aluminium cladding titanium composite alloy powder |
| WO2019145409A1 (en) * | 2018-01-24 | 2019-08-01 | Nanogap Sub Nm Powder, S.A. | Process for producing atomic quantum clusters |
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| JPH08188804A (en) | 1996-07-23 |
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