JP2007332391A - Copper powder and its production method - Google Patents
Copper powder and its production method Download PDFInfo
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- JP2007332391A JP2007332391A JP2006161881A JP2006161881A JP2007332391A JP 2007332391 A JP2007332391 A JP 2007332391A JP 2006161881 A JP2006161881 A JP 2006161881A JP 2006161881 A JP2006161881 A JP 2006161881A JP 2007332391 A JP2007332391 A JP 2007332391A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 50
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 29
- 229930195729 fatty acid Natural products 0.000 claims abstract description 29
- 239000000194 fatty acid Substances 0.000 claims abstract description 29
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 29
- 238000000227 grinding Methods 0.000 abstract description 10
- 239000000945 filler Substances 0.000 abstract description 6
- 238000010304 firing Methods 0.000 abstract 1
- 238000003754 machining Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 235000021355 Stearic acid Nutrition 0.000 description 8
- 230000017525 heat dissipation Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 8
- 239000008117 stearic acid Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 235000021314 Palmitic acid Nutrition 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-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
- 238000000889 atomisation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
Abstract
Description
本発明は、電子部品の実装分野における導電ペースト用銅粉末、放熱用銅粉末に関するものである。詳しくは銅粉末をより高充填したスルーホールペースト、焼成ペースト、高放熱用充填材として最適性能を示す、タップ密度値が大きい銅粉末及びその製造方法を提供するものである。 The present invention relates to a copper powder for conductive paste and a copper powder for heat dissipation in the field of mounting electronic components. Specifically, the present invention provides a copper powder having a high tap density value and a method for producing the same, which shows optimum performance as a through-hole paste, a fired paste, and a high heat dissipation filler filled with a higher amount of copper powder.
従来の銅粉末はアトマイズ法、水溶液電解法、粉砕法などの方法で得られた球状、樹枝状、片状銅粉末である。塗料あるいはペースト用としては塗膜の平滑性、印刷適性が良い、沈降が遅いなどの理由から、片状銅粉末が使用されている。 Conventional copper powders are spherical, dendritic, and flake shaped copper powders obtained by methods such as atomization, aqueous electrolysis, and pulverization. For paints or pastes, flake copper powder is used because of its smoothness of coating film, good printability, and slow sedimentation.
しかし、スルーホールペースト用、焼成ペースト用銅粉末として、より安定した導電性能あるいは電極材としてのはんだ濡れ性を向上するためには、ペースト成分中の銅粉末の含有量を上げる必要がある。 However, it is necessary to increase the content of the copper powder in the paste component in order to improve the more stable conductive performance or the solder wettability as an electrode material as the copper powder for through-hole paste and fired paste.
しかし従来の扁平状銅粉末ではペースト成分中の銅粉末含有量を一定量以上増加するとペースト自体の流動性が悪くなり、印刷できないなどの欠点が生じた。球状銅粉末は高充填可能であるが、印刷適性が悪く、印刷できなくなり、塗膜外観も非常に悪い。更に、近年電子部品から発生する熱を逃がす高放熱材開発に、高充填銅粉末の要求がある。 However, in the conventional flat copper powder, when the content of the copper powder in the paste component is increased by a certain amount or more, the fluidity of the paste itself is deteriorated, resulting in defects such as inability to print. Spherical copper powder can be highly filled, but printability is poor, printing cannot be performed, and the appearance of the coating film is very poor. Furthermore, in order to develop a high heat dissipation material that releases heat generated from electronic components in recent years, there is a demand for highly filled copper powder.
アトマイズ法による球状銅粉末はタップ密度値の大きい粉末を製造するのに適している。平均粒径２．５μｍの球状銅粉末でタップ密度値４．５g／ｃｍ3、平均粒径５μｍでタップ密度値５．０ｇ／ｃｍ3で、タップ密度値５．１ｇ／ｃｍ3以上の銅粉末は無い。 The spherical copper powder by the atomizing method is suitable for producing a powder having a large tap density value. An average particle size 2.5μm spherical copper powder with a tap density value 4.5 g / cm 3, an average particle diameter of the tap density value 5.0 g / cm 3 at 5 [mu] m, the tap density value 5.1 g / cm 3 or more copper powder There is no.
水溶液電解法の銅粉末はタップ密度値が約２ｇ／ｃｍ3と小さい。片状銅粉末でもタップ密度値は約２ｇ／ｃｍ3と小さい。ポリマーに銅粉末を高充填しても印刷特性を悪くしない為には、タップ密度値５．１ｇ／ｃｍ3以上の銅粉末が要求されているが、まだ得られていない。 Copper powder of the aqueous electrolytic method has a small tap density value of about 2 g / cm 3 . Even the flake copper powder has a small tap density value of about 2 g / cm 3 . A copper powder having a tap density value of 5.1 g / cm 3 or more is required in order not to deteriorate the printing characteristics even if the polymer is highly filled with copper powder, but it has not been obtained yet.
また、特許文献１によるとスルーホールペースト用及び外部電極用などの導電ペースト用としての円盤状銅粉末が提案されているが、高充填が要求されるスルーホールペースト、焼成ペースト、放熱用として、タップ密度値が５．１ｇ／ｃｍ3以上の銅粉は得られていない。 In addition, according to Patent Document 1, disk-shaped copper powder for conductive pastes such as through-hole pastes and external electrodes has been proposed, but for through-hole pastes, fired pastes, and heat dissipations that require high filling, Copper powder having a tap density value of 5.1 g / cm 3 or more has not been obtained.
本発明は、上記従来技術の問題点を、銅粉末の表面処理、粒度、粒形を検討した結果、タップ密度値が大きい銅粉末を提供することによって印刷適性上の問題を解決し、高充填ペーストを提供することを課題とする。 As a result of examining the surface treatment, the particle size, and the particle shape of the copper powder, the present invention solves the problem in printability by providing a copper powder having a large tap density value. It is an object to provide a paste.
本発明は、このような従来の問題点を解決することを目的としてなされたもので、銅粉末に脂肪酸を０．０２〜０．５重量％均一に被覆した、平均粒子径３〜１０μｍの球状と円盤状の粒子が混在した、タップ密度値が５．１ｇ／ｃｍ3以上であることを特徴として、ポリマーに高充填しても印刷特性を悪くしない銅粉末を実現した。 The present invention was made for the purpose of solving such conventional problems, and a spherical shape having an average particle diameter of 3 to 10 μm, in which a copper powder is uniformly coated with 0.02 to 0.5% by weight of a fatty acid. And a disc-like particle mixture, and the tap density value is 5.1 g / cm 3 or more, thereby realizing a copper powder that does not deteriorate the printing characteristics even when the polymer is highly filled.
我々はスルーホールペースト、焼成ペースト、放熱用充填材として銅粉末をポリマーに高充填しても印刷適性を悪くしない銅粉末の研究を行った結果、銅粉末のタップ密度値と相関性があり、タップ密度値５．１ｇ／ｃｍ3以上で有れば良いことを見出した。 As a result of conducting research on copper powder that does not deteriorate printability even if the polymer is filled with copper powder as a through-hole paste, fired paste, and heat dissipation filler, there is a correlation with the tap density value of the copper powder. It has been found that the tap density value should be 5.1 g / cm 3 or more.
本発明の銅粉末は球状および円盤状銅粉末粒子全てを脂肪酸で被覆する必要がある。被覆していない銅粉末だと充填密度を上げる事が出来ない。被覆する油脂量は粒子径により変える必要があるが銅粉末に対して０．０２〜０．５重量％が良い。少ないと密度が上がらないし、多いと逆に流動性が悪く充填密度が上がらない。 The copper powder of the present invention needs to coat all spherical and discoidal copper powder particles with a fatty acid. If the copper powder is not coated, the packing density cannot be increased. The amount of oil to be coated needs to be changed depending on the particle diameter, but is preferably 0.02 to 0.5% by weight based on the copper powder. If the amount is too small, the density will not increase. If the amount is too large, the fluidity is poor and the packing density does not increase.
銅粉末の平均粒子径は３〜１０μｍがスルーホールペースト、焼成ペースト、放熱用充填材として、本発明の方法で高充填できる最適の粒子径である。これよりも細かくても、大きくてもタップ密度値５．１ｇ／ｃｍ3以上の銅粉末はできない。 The average particle size of the copper powder is 3 to 10 μm, which is the optimum particle size that can be highly filled by the method of the present invention as a through-hole paste, a fired paste, and a heat dissipation filler. Even finer or larger than this, copper powder having a tap density value of 5.1 g / cm 3 or more cannot be obtained.
本発明の銅粉末の製造方法としては、平均粒子径２．５〜８μｍの球状銅粉末に脂肪酸を０．０２〜０．５重量％添加し、１／１６〜１／４インチの球状媒体を用いて、粉砕機で物理的に銅粉末に脂肪酸を被覆しながら円盤状加工することで製造できる。 As the method for producing the copper powder of the present invention, 0.02 to 0.5% by weight of a fatty acid is added to a spherical copper powder having an average particle diameter of 2.5 to 8 μm, and a 1/16 to 1/4 inch spherical medium is formed. It can be manufactured by using a pulverizer to process a disk while physically coating the copper powder with a fatty acid.
球状銅粉末を1／１６〜1／4インチの球状スチールボール、セラミックスボールを粉砕媒体としてボールミル、アジテーターアーム粉砕機で加工すると、細かい粒子の球状銅粉末は粉砕媒体が当たりにくく球状のまま存在し、大きな粒子は円盤状に加工される。 When spherical copper powder is processed with a ball mill or agitator arm pulverizer using 1/16 to 1/4 inch spherical steel balls and ceramic balls as pulverizing media, the finely sized spherical copper powders are hard to hit the pulverizing media and remain spherical. Large particles are processed into a disk shape.
その結果、得られた銅粉末は細かい球状粒子が大きい円盤状銅粉末の間に充填されることになり、タップ密度値が５．１ｇ／ｃｍ3以上の銅粉末が得られる。 As a result, the obtained copper powder is filled between disk-shaped copper powders having fine spherical particles and a copper powder having a tap density value of 5.1 g / cm 3 or more is obtained.
脂肪酸はミリスチン酸、パルミチン酸、ステアリン酸などの高級脂肪酸が良い。脂肪酸量、粉砕媒体のサイズ、粉砕力となる回転数や時間は、粉砕加工する銅粉末の粒子径、目的とするタップ密度値で本発明の範囲内で変える事ができる。 The fatty acid is preferably a higher fatty acid such as myristic acid, palmitic acid or stearic acid. The amount of fatty acid, the size of the pulverizing medium, the number of rotations and the time for the pulverizing force can be changed within the scope of the present invention depending on the particle diameter of the copper powder to be pulverized and the target tap density value.
本発明の方法以外で本発明の銅粉末を得る方法としては、脂肪酸で被覆した球状銅粉末と脂肪酸で被覆した円盤状銅粉末を別々に配合し、タップ密度値５．１ｇ／ｃｍ3以上にする事も可能であるが工業的でない。 As a method of obtaining the copper powder of the present invention other than the method of the present invention, a spherical copper powder coated with a fatty acid and a disk-shaped copper powder coated with a fatty acid are blended separately, and the tap density value is 5.1 g / cm 3 or more. It is possible to do this, but it is not industrial.
本発明の銅粉末は、タップ密度値が大きい銅粉末を得ることにより、ペースト成分中の銅粉末の含有量を上げても、印刷特性を悪くすることなく印刷可能となった。このことで、従来まで使用の難しかったスルーホールペースト用、焼成ペースト用、あるいは高放熱用としての充填材に使用可能となった。また、球状と円盤状の形状をした粒子が混在するため印刷特性も飛躍的に良くなり、また、脂肪酸が銅粉末に均一に被覆しているため分散性も向上した。 The copper powder of the present invention can be printed without deteriorating the printing characteristics even when the content of the copper powder in the paste component is increased by obtaining a copper powder having a large tap density value. This makes it possible to use as a filler for through-hole paste, fired paste, or high heat dissipation, which has been difficult to use until now. In addition, since the spherical and disk-shaped particles are mixed, the printing characteristics are dramatically improved, and the dispersibility is improved because the fatty acid is uniformly coated on the copper powder.
本発明の銅粉末および製造方法は、平均粒子径２．５〜８μｍの球状銅粉末に脂肪酸を０．０２〜０．５重量％添加し、１／１６〜１／４インチの球状媒体を用いて、粉砕機で物理的に銅粉末に脂肪酸を被覆しながら円盤状加工することによりタップ密度値が大きい高充填銅粉末が得ることができる。本発明の構成を詳しく説明すれば次の通りである。 In the copper powder and the production method of the present invention, 0.02 to 0.5% by weight of a fatty acid is added to a spherical copper powder having an average particle size of 2.5 to 8 μm, and a 1/16 to 1/4 inch spherical medium is used. Then, a high-filled copper powder having a large tap density value can be obtained by disk processing while physically coating the copper powder with fatty acid using a pulverizer. The configuration of the present invention will be described in detail as follows.
実施例１． Example 1.
平均粒径２．５μｍでタップ密度値４．５ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸２ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／１６インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで１４時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径３μｍ、タップ密度値５．３ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 2 g of stearic acid was added to 1 kg of spherical copper powder having an average particle diameter of 2.5 μm and a tap density value of 4.5 g / cm 3 , and charged into a medium stirring mill. Disc processing was performed for 14 hours at 10 kg of steel balls having a diameter of 1/16 inch as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 3 μm in which spherical and disk-shaped particles coexist and a tap density value of 5.3 g / cm 3 was obtained.
実施例２． Example 2
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸１ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径６．０μｍ、タップ密度値５．６ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 1 g of stearic acid was added to 1 kg of spherical copper powder having an average particle diameter of 5.0 μm and a tap density value of 5.0 g / cm 3 , and charged into a medium stirring mill. Disc processing was performed for 7 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 6.0 μm and a tap density value of 5.6 g / cm 3 in which spherical and disk-shaped particles are mixed was obtained.
実施例３． Example 3
平均粒径８．０μｍでタップ密度値４．８ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸０．５ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／４インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径１０．０μｍ、タップ密度値５．５ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 0.5 g of stearic acid was added to 1 kg of spherical copper powder having an average particle size of 8.0 μm and a tap density value of 4.8 g / cm 3 , and charged into a medium stirring mill. Disc processing was carried out for 7 hours at a milling speed of 40 rpm with 10 kg of 1/4 inch diameter steel balls as the grinding media. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 10.0 μm in which spherical and disk-shaped particles coexist and a tap density value of 5.5 g / cm 3 was obtained.
実施例４． Example 4
平均粒径８．０μｍでタップ密度値４．８ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸０．２ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで１４時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径９．５μｍ、タップ密度値５．６ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 0.2 g of stearic acid was added to 1 kg of spherical copper powder having an average particle size of 8.0 μm and a tap density value of 4.8 g / cm 3 , and the mixture was put into a medium stirring mill. A disk-shaped process was performed for 14 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium at a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 9.5 μm and a tap density value of 5.6 g / cm 3 in which spherical and disk-shaped particles are mixed was obtained.
実施例５． Example 5 FIG.
平均粒径２．５μｍでタップ密度値４．５ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸５ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径３．５μｍ、タップ密度値５．１ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 5 g of stearic acid was added to 1 kg of spherical copper powder having an average particle diameter of 2.5 μm and a tap density value of 4.5 g / cm 3 , and charged into a medium stirring mill. Disc processing was performed for 7 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 3.5 μm in which spherical and disk-shaped particles coexist and a tap density value of 5.1 g / cm 3 was obtained.
実施例６． Example 6
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末を１ｋｇにパルミチン酸１ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径６．０μｍ、タップ密度値５．６ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 1 g of spherical copper powder having an average particle diameter of 5.0 μm and a tap density value of 5.0 g / cm 3 was added to 1 kg of palmitic acid, and the mixture was put into a medium stirring mill. Disc processing was performed for 7 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 6.0 μm and a tap density value of 5.6 g / cm 3 in which spherical and disk-shaped particles are mixed was obtained.
実施例７． Example 7
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末を１ｋｇにミリスチン酸１ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径６．５μｍ、タップ密度値５．４ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 1 g of myristic acid was added to 1 kg of spherical copper powder having an average particle diameter of 5.0 μm and a tap density value of 5.0 g / cm 3 , and charged into a medium stirring mill. Disc processing was performed for 7 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 6.5 μm and a tap density value of 5.4 g / cm 3 in which spherical and disk-shaped particles coexist was obtained.
実施例８． Example 8 FIG.
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸０．５ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のスチールボール１０ｋｇ、ミル回転数４０ｒｐｍで７時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径５．８μｍ、タップ密度値５．８ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 0.5 g of stearic acid was added to 1 kg of spherical copper powder having an average particle diameter of 5.0 μm and a tap density value of 5.0 g / cm 3 , and charged into a medium stirring mill. Disc processing was performed for 7 hours at 10 kg of a 1/8 inch diameter steel ball as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 5.8 μm and a tap density value of 5.8 g / cm 3 mixed with spherical and disk-shaped particles was obtained.
実施例９． Example 9
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末を１ｋｇにステアリン酸１ｇ添加し、媒体攪拌ミルに投入した。粉砕媒体として１／８インチ径のアルミナボール８ｋｇ、ミル回転数４０ｒｐｍで１０時間、円盤状加工を行った。その結果、球状と円盤状の粒子が混在する平均粒径６．１μｍ、タップ密度値５．６ｇ／ｃｍ3の脂肪酸で被覆した円盤状銅粉末が得られた。 1 g of stearic acid was added to 1 kg of spherical copper powder having an average particle diameter of 5.0 μm and a tap density value of 5.0 g / cm 3 , and charged into a medium stirring mill. Disc-like processing was performed for 10 hours at 8 kg of alumina balls having a diameter of 1/8 inch as a grinding medium and a mill rotational speed of 40 rpm. As a result, a disk-shaped copper powder coated with a fatty acid having an average particle diameter of 6.1 μm in which spherical and disk-shaped particles are mixed and a tap density value of 5.6 g / cm 3 was obtained.
比較例 Comparative example
平均粒径５．０μｍでタップ密度値５．０ｇ／ｃｍ3の球状銅粉末にタップ密度値２．０ｇ／ｃｍ3の片状銅粉を１０、２０、３０、４０、５０、６０、７０、８０、９０重量％加えてミキサーに投入し混合した。その結果、混合粉のタップ密度値はそれぞれ４．３ｇ／ｃｍ3、３．８ｇ／ｃｍ3、３．４ｇ／ｃｍ3、３．１ｇ／ｃｍ3、２．９ｇ／ｃｍ3、２．６ｇ／ｃｍ3、２．４ｇ／ｃｍ3、２．４ｇ／ｃｍ3、２．３ｇ／ｃｍ3となり、全て５．１ｇ／ｃｍ3を越えなかった。 The average particle diameter of tap density spherical copper powder tap density values 5.0 g / cm 3 at 5.0μm value 2.0 g / cm 3 flaky copper powder 10,20,30,40,50,60,70, 80% and 90% by weight were added to the mixer and mixed. As a result, each of the tap density value of the mixed powder 4.3g / cm 3, 3.8g / cm 3, 3.4g / cm 3, 3.1g / cm 3, 2.9g / cm 3, 2.6g / cm 3 , 2.4 g / cm 3 , 2.4 g / cm 3 , and 2.3 g / cm 3 , all of which did not exceed 5.1 g / cm 3 .
本発明の銅粉末は、タップ密度値が大きい銅粉末を得ることにより、ペースト成分中の銅粉末の含有量を上げても、印刷特性を悪くすることなく印刷可能となった。このことで、従来まで使用の難しかったスルーホールペースト用、焼成ペースト用、あるいは高放熱用としての充填材に使用可能となった。また、球状と円盤形状をした粒子が混在するため印刷特性も飛躍的に良くなり、また、脂肪酸が銅粉末に均一に被覆しているため分散性も向上した。 The copper powder of the present invention can be printed without deteriorating the printing characteristics even when the content of the copper powder in the paste component is increased by obtaining a copper powder having a large tap density value. This makes it possible to use as a filler for through-hole paste, fired paste, or high heat dissipation, which has been difficult to use until now. In addition, since the spherical and disk-shaped particles are mixed, the printing characteristics are dramatically improved, and the dispersibility is improved because the fatty acid is uniformly coated on the copper powder.
従って、本発明の産業上利用性は非常に高いといえる。 Therefore, it can be said that the industrial applicability of the present invention is very high.
Claims (3)
3. When producing the copper powder according to claim 1 or 2, 0.02 to 0.5% by weight of a fatty acid is added to a spherical copper powder having an average particle size of 2.5 to 8 μm, and a 1/16 to 1/4 inch spherical medium is added. A method for producing a copper powder, characterized in that a fatty acid is physically coated and disk-shaped using a pulverizer.
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| JP2010018832A (en) * | 2008-07-09 | 2010-01-28 | Nippon Handa Kk | Material for joining metallic members, manufacturing method of the material for joining metallic members, joined product of metallic members and manufacturing method of bump for electric circuit connection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235201A (en) * | 1991-01-10 | 1992-08-24 | Daido Steel Co Ltd | Method for controlling tap density of powder |
| JP2002015622A (en) * | 2000-06-30 | 2002-01-18 | Fukuda Metal Foil & Powder Co Ltd | Copper powder for electro-conductive paste and its manufacturing method |
| JP2005008930A (en) * | 2003-06-18 | 2005-01-13 | Nippon Atomized Metal Powers Corp | Metallic powder, and apparatus and method for manufacturing metallic powder |
| JP2005076058A (en) * | 2003-08-29 | 2005-03-24 | Fukuda Metal Foil & Powder Co Ltd | Method for manufacturing flaky metal powder |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235201A (en) * | 1991-01-10 | 1992-08-24 | Daido Steel Co Ltd | Method for controlling tap density of powder |
| JP2002015622A (en) * | 2000-06-30 | 2002-01-18 | Fukuda Metal Foil & Powder Co Ltd | Copper powder for electro-conductive paste and its manufacturing method |
| JP2005008930A (en) * | 2003-06-18 | 2005-01-13 | Nippon Atomized Metal Powers Corp | Metallic powder, and apparatus and method for manufacturing metallic powder |
| JP2005076058A (en) * | 2003-08-29 | 2005-03-24 | Fukuda Metal Foil & Powder Co Ltd | Method for manufacturing flaky metal powder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010018832A (en) * | 2008-07-09 | 2010-01-28 | Nippon Handa Kk | Material for joining metallic members, manufacturing method of the material for joining metallic members, joined product of metallic members and manufacturing method of bump for electric circuit connection |
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