WO2015040714A1 - Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト - Google Patents
Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト Download PDFInfo
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- WO2015040714A1 WO2015040714A1 PCT/JP2013/075288 JP2013075288W WO2015040714A1 WO 2015040714 A1 WO2015040714 A1 WO 2015040714A1 JP 2013075288 W JP2013075288 W JP 2013075288W WO 2015040714 A1 WO2015040714 A1 WO 2015040714A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
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- B22—CASTING; POWDER METALLURGY
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3033—Ni as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C13/00—Alloys based on tin
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C13/00—Alloys based on tin
- C22C13/02—Alloys based on tin with antimony or bismuth as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
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- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/15—Nickel or cobalt
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- B22—CASTING; POWDER METALLURGY
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- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/30—Low melting point metals, i.e. Zn, Pb, Sn, Cd, In, Ga
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- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
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- B22F2304/00—Physical aspects of the powder
- B22F2304/15—Millimeter size particles, i.e. above 500 micrometer
Definitions
- the present invention relates to Ni balls with low ⁇ dose, Ni core balls coated with Ni balls by solder plating, Ni balls or solder joints using Ni core balls, foam solders using Ni balls or Ni core balls, Ni balls or
- the present invention relates to a solder paste using Ni core balls.
- the electronic components to be mounted have been rapidly downsized.
- the electronic component uses a ball grid array (hereinafter referred to as “BGA”) in which electrodes are provided on the back surface. .
- BGA ball grid array
- An electronic component to which BGA is applied includes, for example, a semiconductor package.
- a semiconductor package a semiconductor chip having electrodes is sealed with a resin.
- Solder bumps are formed on the electrodes of the semiconductor chip. This solder bump is formed by joining a solder ball to an electrode of a semiconductor chip.
- a semiconductor package using BGA is mounted on a printed circuit board by placing the solder bumps on the printed circuit board so that each solder bump contacts the conductive land of the printed circuit board, and the solder bumps and lands melted by heating are joined. Is done. Further, in order to meet the demand for further high-density mounting, three-dimensional high-density mounting in which semiconductor packages are stacked in the height direction has been studied.
- solder bump using a ball having a small diameter formed of a metal having a melting point higher than that of solder such as Ni has been studied.
- a solder bump having a Ni ball or the like can support the semiconductor package by the Ni ball that does not melt at the melting point of the solder even when the weight of the semiconductor package is applied to the solder bump when the electronic component is mounted on the printed board. Therefore, the solder bump is not crushed by the weight of the semiconductor package.
- Patent Document 1 is cited as a related technique.
- Ni balls contained in solder as described in Patent Document 1 are also required to reduce soft errors caused by high-density mounting.
- Patent Document 1 Japanese Patent Laid-Open No. 11-261210
- Ni balls with low ⁇ rays are reduced to such an extent that soft errors are not caused by the conventional manufacturing conditions of Ni balls.
- 210 Po has a boiling point of 962 ° C., and it seems that it volatilizes sufficiently to the extent that soft errors do not occur when heated to 1500 ° C. or higher.
- the temperature at 210 Po is always sufficiently reduced. It is not certain whether Ni balls with low ⁇ rays can be obtained by manufacturing conventional Ni balls.
- Ni balls using a high-purity Ni material, but it is not necessary to reduce the content of elements that do not contribute to the ⁇ dose of Ni balls. Moreover, even if high-purity Ni is used in the dark, the cost only increases.
- Ni ball has a low sphericity indicating how close to the true sphere
- the Ni ball original function of controlling the standoff height is not exhibited. For this reason, bumps having a non-uniform height are formed, causing a problem during mounting. From the above background, Ni balls with high sphericity have been desired.
- An object of the present invention is to provide a Ni ball having a low ⁇ dose and a high sphericity even when an impurity element other than Ni is contained in a certain amount or more, a Ni core ball, a Ni ball or a Ni core ball coated with a solder ball. It is to provide a used solder joint.
- the present inventors have found that even when the purity of a commercially available Ni material is 99.9 to 99.99%, U and Th are reduced to 5 ppb or less.
- the purity of a metal material such as Ni is 99% 2N, 99.9% 3N, 99.99% 4N, and 99.999% 5N.
- the present inventors have noted that the cause of the soft error is 210 Po that remains slightly to the extent that the content cannot be measured quantitatively.
- the temperature of the molten Ni is set high, or the Ni ball after granulation is heat-treated, the Ni ball the purity of 99.995% (hereinafter referred to as 4N5.) is ⁇ dose Ni balls even less was found that suppressed below 0.0200cph / cm 2.
- the present inventors have a purity of the Ni balls of 4N5 or less, that is, elements other than Ni contained in the Ni balls (hereinafter referred to as “impurity elements” as appropriate).
- impurity elements elements other than Ni contained in the Ni balls.
- the present invention was completed by knowing that it is necessary to contain a total of 50 ppm or more.
- the present invention is as follows. (1) U content is 5 ppb or less, Th content is 5 ppb or less, purity is 99.9% or more and 99.995% or less, and ⁇ dose is 0.0200 cph / cm 2 or less. , Pb or Bi, or the total content of Pb and Bi is 1 ppm or more, and the Ni balls have a sphericity of 0.90 or more.
- Ni ball according to any one of (1) to (3) above having a diameter of 1 to 1000 ⁇ m.
- a Ni core ball comprising the Ni ball according to any one of (1) to (4) above and solder plating for covering the Ni ball.
- Example 2 is a SEM photograph of Ni balls in Example 1.
- 4 is a SEM photograph of Ni balls in Example 2.
- 3 is a SEM photograph of Ni balls in Comparative Example 1.
- the unit (ppm, ppb, and%) relating to the composition of the Ni ball represents a ratio (mass ppm, mass ppb, and mass%) to the mass of the Ni ball unless otherwise specified. Further, the unit (ppm, ppb, and%) relating to the composition of the Ni core ball solder coating represents a ratio (mass ppm, mass ppb, and mass%) to the mass of the solder coating unless otherwise specified.
- the Ni ball according to the present invention has a U content of 5 ppb or less, a Th content of 5 ppb or less, a purity of 99.9% or more and 99.995% or less, and an ⁇ dose of 0.0200 cph / cm 2 or less, any of the content of Pb or Bi, or is the content of the sum of Pb and Bi are 1ppm or more, and 0.90 or more sphericity.
- U and Th are radioisotopes, and it is necessary to suppress their contents in order to suppress soft errors.
- the contents of U and Th must be 5 ppb or less in order to make the ⁇ dose of the Ni balls 0.0200 cph / cm 2 or less. Further, from the viewpoint of suppressing soft errors in current or future high-density mounting, the contents of U and Th are preferably 2 ppb or less, respectively.
- Ni balls according to the present invention have a purity of 3N or more and 4N5 or less. That is, the Ni ball according to the present invention has an impurity element content of 50 ppm or more. When the purity of Ni constituting the Ni ball is within this range, a sufficient amount of crystal nuclei for increasing the sphericity of the Ni ball can be secured in the molten Ni. The reason why the sphericity is increased will be described in detail as follows.
- the Ni material formed into small pieces of a predetermined shape is melted by heating, and the molten Ni becomes spherical due to surface tension, which solidifies into Ni balls.
- the molten Ni solidifies from the liquid state, crystal grains grow in the spherical molten Ni.
- the impurity elements serve as crystal nuclei and growth of crystal grains is suppressed. Accordingly, the spherical molten Ni becomes a Ni ball having high sphericity due to the fine crystal grains whose growth is suppressed.
- the impurity element include Sn, Sb, Bi, Zn, Fe, Al, As, Ag, In, Cd, Cu, Pb, Au, P, S, U, and Th.
- the lower limit of purity is not particularly limited, it is preferably 3N or more from the viewpoint of suppressing the ⁇ dose and suppressing the deterioration of the electrical conductivity and thermal conductivity of the Ni ball due to the decrease in purity. That is, the content of impurity elements in the Ni balls excluding Ni is preferably 1000 ppm or less.
- ⁇ dose 0.0200 cph / cm 2 or less
- the ⁇ dose of the Ni ball according to the present invention is 0.0200 cph / cm 2 or less. This is an ⁇ dose that does not cause a soft error in high-density mounting of electronic components.
- the ⁇ dose is preferably 0.0020 cph / cm 2 or less, more preferably 0.0010 cph / cm 2 or less, from the viewpoint of suppressing soft errors in further high-density mounting.
- the content of either Pb or Bi, or the total content of Pb and Bi is 1 ppm or more As the impurity elements, Sn, Sb, Bi, Zn, Fe, Al, As, Ag, In, Cd, Cu , Pb, Au, P, S, U, Th, etc. are conceivable.
- the impurity elements the Ni ball according to the present invention contains either Pb or Bi, or the total content of Pb and Bi.
- the content is preferably 1 ppm or more as an impurity element. In the present invention, it is not necessary to reduce the content of either Pb or Bi or the contents of Pb and Bi to the utmost to reduce the ⁇ dose. This is due to the following reason.
- 210 Pb is changed to 210 Bi by decay beta
- 210 Bi is changed to 210 Po by decay beta
- 210 Po is changed to 206 Pb by decay alpha.
- the content of either the impurity element Pb or Bi, or the content of Pb and Bi is as low as possible.
- the content ratio of 210 Pb contained in Pb and 210 Bi contained in Bi is low. Therefore, if the Pb and Bi contents are reduced to some extent, it is considered that 210 Pb and 210 Bi are sufficiently removed to such an extent that the ⁇ dose can be reduced to the aforementioned range.
- the content of the impurity element is high as described above.
- the Ni ball according to the present invention preferably has a Pb or Bi content, or a total content of Pb and Bi of 1 ppm or more.
- the content of either Pb or Bi, or the total content of Pb and Bi is more preferably 10 ppm or more.
- the upper limit is not limited as long as the ⁇ dose can be reduced, but from the viewpoint of suppressing the deterioration of the electric conductivity of the Ni ball, more preferably the content of either Pb or Bi, or the total of Pb and Bi
- the content is less than 1000 ppm.
- the content of Pb is more preferably 10 ppm to 50 ppm, and the content of Bi is more preferably 10 ppm to 50 ppm.
- the shape of the Ni ball according to the present invention preferably has a sphericity of 0.90 or more from the viewpoint of controlling the standoff height.
- the Ni ball has an indefinite shape, so that bumps having a non-uniform height are formed at the time of bump formation, and the possibility of occurrence of poor bonding is increased.
- the sphericity is more preferably 0.94 or more.
- the sphericity represents a deviation from the sphere.
- the sphericity is obtained by various methods such as a least square center method (LSC method), a minimum region center method (MZC method), a maximum inscribed center method (MIC method), and a minimum circumscribed center method (MCC method). .
- Diameter of Ni ball 1 ⁇ 1000 ⁇ m
- the diameter of the Ni ball according to the present invention is preferably 1 to 1000 ⁇ m. Within this range, spherical Ni balls can be stably produced, and connection short-circuiting when the terminals are at a narrow pitch can be suppressed.
- the “Ni ball” may be referred to as “Ni powder”.
- the diameter of the Ni ball is generally 1 to 300 ⁇ m.
- the Ni ball according to the present invention can also be applied to a so-called Ni core ball in which various solder platings are applied to the surface using the Ni ball of the present invention as a core.
- strike plating treatment may be performed in advance using a hydrochloric acid Ni solution or the like. By performing the strike plating process, the oxide film on the Ni surface can be removed, and the adhesion between the Ni ball and the solder plating can be improved when the Ni core ball is manufactured.
- the Ni ball and the Ni core ball of the present invention can be used for a solder joint of an electronic component.
- the Ni ball and the Ni core ball of the present invention can be used for foam solder in which the Ni ball or the Ni core ball is dispersed in the solder.
- the Ni ball and the Ni core ball of the present invention can be used for a solder paste in which a solder powder, a Ni ball or a Ni core ball, and a flux are kneaded.
- solder and the solder paste for example, a solder alloy having a composition of Sn-3Ag-0.5Cu (each numerical value is mass%) is used.
- the present invention is not limited to this solder alloy.
- the Ni core ball includes the above-described Ni ball and a solder plating film that covers the surface of the Ni ball.
- the solder plating film of the present invention is formed mainly by flowing a Ni ball or a plating solution as a workpiece. Due to the flow of the plating solution, elements of Pb, Bi, and Po form salts in the plating solution and precipitate. Once a precipitate that is a salt is formed, it is stably present in the plating solution. Therefore, in the Ni core ball according to the present invention, precipitates are not taken into the solder coating, the content of radioactive elements contained in the solder coating can be reduced, and the ⁇ dose of the Ni core ball itself can be reduced. Become.
- the composition of the solder plating film is not particularly limited as long as it is an alloy composition of a lead-free solder alloy containing Sn as a main component.
- the solder plating film may be a Sn plating film. Examples thereof include Sn, Sn—Ag alloy, Sn—Cu alloy, Sn—Ag—Cu alloy, Sn—In alloy, and those obtained by adding a predetermined alloy element thereto. In any case, the Sn content is 40% by mass or more.
- alloy elements to be added include Ag, Cu, In, Ni, Co, Sb, Ge, P, and Fe.
- the alloy composition of the solder plating film is preferably a Sn-3Ag-0.5Cu alloy from the viewpoint of drop impact characteristics.
- the thickness of the solder plating film is not particularly limited, but is preferably 100 ⁇ m (one side) or less. Generally, it may be 20 to 50 ⁇ m.
- U and Th are radioactive elements, and in order to suppress soft errors, the content of solder plating is also suppressed. There is a need.
- the contents of U and Th are required to be 5 ppb or less in order to set the ⁇ dose of the solder plating film to 0.0200 cph / cm 2 or less. Further, from the viewpoint of suppressing soft errors in current or future high-density mounting, the contents of U and Th are preferably 2 ppb or less, respectively.
- ⁇ dose 0.0200 cph / cm 2 or less
- the ⁇ dose of the Ni core ball according to the present invention is 0.0200 cph / cm 2 or less as in the case of the Ni ball. This is an ⁇ dose that does not cause a soft error in high-density mounting of electronic components.
- the ⁇ dose of the Ni nucleus ball according to the present invention is such that the ⁇ dose of the Ni ball constituting the Ni nucleus ball is 0.0200 cph / cm 2 or less as described above, and the solder plating constituting the Ni nucleus ball. This is achieved when the ⁇ dose of the coating is 0.0200 cph / cm 2 or less.
- the solder plating film of the present invention is formed at a temperature of 100 ° C. at the highest, it is unlikely that the content of radioactive elements is reduced by vaporization of radioactive elements such as U, Th, 210 Po, Bi and Pb.
- radioactive elements such as U, Th, 210 Po, Bi and Pb.
- U, Th, Pb, Bi, and 210 Po form a salt in the plating solution and precipitate.
- the precipitated salt is electrically neutral and does not enter the solder plating film even if the plating solution is flowing.
- the Ni core ball according to the present invention is coated with such a solder plating film, it exhibits a low ⁇ dose.
- the ⁇ dose is preferably 0.0020 cph / cm 2 or less, more preferably 0.0010 cph / cm 2 or less, from the viewpoint of suppressing soft errors in further high-density mounting.
- the upper limit is preferably 150 ppm or less, more preferably 100 ppm or less, still more preferably 50 ppm or less, and particularly preferably 10 ppm or less from the viewpoint of reducing the ⁇ dose.
- the purity of the solder plating film is the total content of impurities other than Sn in the solder plating film.
- the solder plating film is a Sn-3Ag-0.5Cu solder alloy, the purity of the solder plating film is the sum of the contents of impurities other than Sn, Ag and Cu in the solder plating film.
- Examples of the impurities contained in the solder plating film include Ag, Ni, Pb, Au, U, Th, and the like in the case of the Sn solder plating film.
- Sb, Fe, As, In, Ni, Pb, Au, U, Th and the like can be mentioned.
- the Bi content is small.
- Bi raw material contains a trace amount of 210 Bi, which is a radioisotope. Therefore, it is considered that the ⁇ dose of the solder plating film can be remarkably reduced by reducing the Bi content.
- the content of Bi in the solder plating film is preferably 15 ppm or less, more preferably 10 ppm or less, and particularly preferably 0 ppm.
- the aggregate of “Ni core balls” may be referred to as “Ni core powder”.
- the “Ni core powder” is an aggregate of a large number of Ni core balls in which the individual Ni core balls have the above-described characteristics. For example, it is distinguished in terms of usage from a single Ni core ball, such as being formulated as a powder in solder paste. Similarly, when used for the formation of solder bumps, it is normally treated as an aggregate, so that the “Ni core powder” used in such a form is distinguished from a single Ni core ball.
- Ni material is melted at a high temperature, and liquid molten Ni is sprayed from a nozzle at a high speed, whereby the atomized molten Ni is cooled and Ni balls are granulated.
- gas is used as a medium for spraying molten Ni at a high speed from a nozzle, it is called a gas atomizing method, and when water is used, it is called a water atomizing method.
- Ni balls are produced by either atomizing method. be able to.
- a molten Ni droplet is dropped from an orifice, and the droplet is cooled to granulate Ni balls.
- the Ni balls granulated by each atomizing method may be reheated at a temperature of 800 to 1000 ° C. for 30 to 60 minutes.
- the Ni material may be preheated at 800 to 1000 ° C. before the Ni balls are granulated.
- Ni material that is the raw material of the Ni balls
- pellets, wires, plate materials and the like can be used as the Ni material.
- the purity of the Ni material may be 2N to 4N from the viewpoint of not reducing the purity of the Ni ball too much.
- the heat treatment described above may not be performed, and the holding temperature of molten Ni may be lowered to about 1000 ° C. as in the conventional case.
- the above-described heat treatment may be omitted or changed as appropriate according to the purity of the Ni material and the ⁇ dose.
- Ni balls having a high ⁇ dose or deformed Ni balls are manufactured, these Ni balls can be reused as raw materials, and the ⁇ dose can be further reduced.
- a method for producing a Ni core ball according to the present invention will be described.
- a known electrolytic plating method such as barrel plating, or a pump connected to the plating tank is in the plating tank.
- a high-speed turbulent flow is generated in the plating solution, and a plating film is formed on the Ni balls by the turbulent flow of the plating solution.
- the plating solution is vibrated at a predetermined frequency by providing a vibration plate in the plating tank. For example, there is a method of forming a plating film on the Ni ball by the turbulent flow of the plating solution.
- Ni core ball having a diameter of about 140 ⁇ m is formed by forming a Sn—Ag—Cu solder plating film having a thickness of 20 ⁇ m on one 100 ⁇ m diameter Ni ball.
- the Sn—Ag—Cu-containing plating solution according to an embodiment of the present invention contains Sn, Ag, and Cu as essential components as a sulfonic acid and a metal component in a medium mainly composed of water.
- the metal component exists in the plating solution as Sn ions (Sn 2+ and / or Sn 4+ ), Ag ions (Ag + ), and Cu ions (Cu + / Cu 2+ ).
- the plating solution is obtained by mixing a plating mother solution mainly composed of water and sulfonic acids and a metal compound, and preferably contains an organic complexing agent for the stability of metal ions.
- Examples of the metal compound in the plating solution include the following.
- Sn compound examples include tin salts of organic sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, 2-propanolsulfonic acid, p-phenolsulfonic acid, tin sulfate, tin oxide, tin nitrate, tin chloride, bromide.
- organic sulfonic acids such as methanesulfonic acid, ethanesulfonic acid, 2-propanolsulfonic acid, p-phenolsulfonic acid, tin sulfate, tin oxide, tin nitrate, tin chloride, bromide.
- the 1st Sn compound of these is mentioned. These Sn compounds can be used individually by 1 type or in mixture of 2 or more types.
- Cu compound copper salts of the above organic sulfonic acids, copper sulfate, copper oxide, copper nitrate, copper chloride, copper bromide, copper iodide, copper phosphate, copper pyrophosphate, copper acetate, copper formate, copper citrate , Copper gluconate, copper tartrate, copper lactate, copper succinate, copper sulfamate, copper borofluoride, copper silicofluoride and the like.
- These Cu compounds can be used individually by 1 type or in mixture of 2 or more types.
- Examples of the Ag compound include silver salts of the above organic sulfonic acids, silver sulfate, silver oxide, silver chloride, silver nitrate, silver bromide, silver iodide, silver phosphate, silver pyrophosphate, silver acetate, silver formate, silver citrate, Examples include silver gluconate, silver tartrate, silver lactate, silver succinate, silver sulfamate, silver borofluoride, and silver silicofluoride. These Ag compounds can be used individually by 1 type or in mixture of 2 or more types.
- the amount of each metal in the plating solution is 0.21 to 2 mol / L, preferably 0.25 to 1 mol / L as Sn 2+ , and 0.01 to 0.1 mol / L, preferably 0.02 to Ag, as Ag. 0.05 mol / L and Cu as 0.002 to 0.02 mol / L, preferably 0.003 to 0.01 mol / L.
- the amount of Sn 2+ may be adjusted in the present invention.
- the Ag ion concentration (Ag / Cu molar ratio) with respect to the Cu ion concentration is preferably in the range of 4.5 to 5.58. In this range, the Sn-3Ag-0.5Cu alloy is used. An Sn—Ag—Cu plating film having a low melting point can be formed.
- the amount of deposition of the desired solder plating is estimated by the following formula (1) according to Faraday's law of electrolysis, the amount of electricity is calculated, and a current is passed through the plating solution so that the calculated amount of electricity is obtained.
- the plating process is performed while flowing the plating solution.
- the capacity of the plating tank can be determined according to the total amount of Ni balls and plating solution.
- w is the amount of electrolytic deposition (g)
- I is the current (A)
- t is the energization time (seconds)
- M is the atomic weight of the deposited element (118.71 in the case of Sn)
- Z is The valence (divalent in the case of Sn)
- F is the Faraday constant (96500 coulombs)
- Q is represented by (I ⁇ sec)
- plating is performed while flowing Ni balls and a plating solution, but the flow method is not particularly limited.
- Ni balls and plating solution can be flowed by rotation of the barrel as in the barrel electrolytic plating method.
- the Ni core ball according to the present invention can be obtained by drying in the air or N2 atmosphere.
- Ni ball of the present invention will be described below, but the present invention is not limited to these.
- Example 1 A Ni wire having a purity of 3N ( ⁇ dose: 0.0034 cph / cm 2 , U: 0.7 ppb, Th: 0.5 ppb) was put into a crucible and preheated at a temperature of 1000 ° C. for 45 minutes. . Thereafter, the discharge temperature was set to 1600 ° C., preferably 1700 ° C., and liquid molten Ni was sprayed from the nozzle at a high speed by a gas atomizing method, and the atomized molten Ni was cooled to granulate Ni balls. This produced Ni balls having an average particle size of 50 ⁇ m. Table 1 shows the elemental analysis results, the ⁇ dose and the sphericity of the produced Ni balls. Below, the measuring method of alpha dose and sphericity is explained in full detail.
- ⁇ ⁇ dose An ⁇ ray measurement device of a gas flow proportional counter was used to measure ⁇ dose.
- a measurement sample is a 300 mm ⁇ 300 mm flat shallow container in which Ni balls are spread. This measurement sample was placed in an ⁇ -ray measuring apparatus and allowed to stand for 24 hours in a PR-10 gas flow, and then the ⁇ dose was measured. Note that the PR-10 gas (90% argon—10% methane) used for the measurement was obtained after 3 weeks or more had passed since the gas cylinder was filled with the PR-10 gas.
- the sphericity was measured with a CNC image measurement system.
- the apparatus is an Ultra Quick Vision, ULTRA QV350-PRO manufactured by Mitutoyo Corporation.
- FIG. 1 An SEM photograph of the produced Ni ball is shown in FIG. The magnification of the SEM photograph is 300 times.
- Example 2 A Ni ball was prepared in the same manner as in Example 1 except that a Ni wire having a purity of 4N5 or less ( ⁇ dose: 0.0026 cph / cm 2 , U: ⁇ 0.5 ppb, Th: ⁇ 0.5 ppb) was used. Elemental analysis and alpha dose were measured. The results are shown in Table 1. Moreover, the SEM photograph of the Ni ball produced in Example 2 is shown in FIG. The magnification of the SEM photograph is 300 times.
- Example 1 A Ni ball was used in the same manner as in Example 1 except that a 5N Ni plate ( ⁇ dose: ⁇ 0.0010 cph / cm 2 , U: ⁇ 0.5 ppb, Th: ⁇ 0.5 ppb) having a purity higher than 4N5 was used. Prepared and measured elemental analysis and alpha dose. The results are shown in Table 1. Moreover, the SEM photograph of the Ni ball produced in Comparative Example 1 is shown in FIG. The magnification of the SEM photograph is 300 times.
- Table 1 shows the elemental analysis results and ⁇ dose before granulation of Ni wire having a purity of 3N ( ⁇ dose: 0.0034 cph / cm 2 , U: 0.8 ppb, Th: 0.5 ppb).
- the ⁇ dose was 0.0010 cph / cm 2 even though the purity was 4N5 or less and the contents of Bi and Pb were 10 ppm or more. Was less than.
- bowl of the comparative example 1 had a purity higher than 4N5
- the alpha dose was naturally less than 0.0010 cph / cm ⁇ 2 >.
- the Ni balls of Example 1 and Example 2 had an ⁇ dose of less than 0.0010 cph / cm 2 for at least 2 years. Therefore, the Ni balls of Example 1 and Example 2 also solved the recent problem that the ⁇ dose increased with time.
- the Ni balls of Examples 1 and 2 have a purity of 4N5 or less (the content of elements other than Ni is 50 ppm or more), both have a sphericity of 0.94 or more. showed that.
- the Ni balls of Comparative Example 1 had a purity higher than 4N5 (the content of elements excluding Ni was less than 50 ppm), and the sphericity was less than 0.90.
- Example 3 With respect to the Ni balls manufactured in Example 1, a Ni plating ball was formed by forming a solder plating film mainly containing Sn under the following conditions.
- the Ni core ball was plated using the following plating solution with an electric quantity of about 0.0038 coulomb so that the Ni ball having a diameter of 50 ⁇ m was coated with the solder plating having a film thickness (one side) of 20 ⁇ m. After the treatment, it was dried in the air to obtain a Ni core ball. When the cross section of the Ni core ball coated with the solder plating film was observed with an SEM photograph, the film thickness was about 40 ⁇ m.
- the solder plating solution was prepared as follows. The entire volume of a 54% by weight methanesulfonic acid aqueous solution was placed in 1/3 of the water required for adjusting the plating solution in the stirring vessel, and used as groundwater. Next, acetylcysteine, which is an example of a mercaptan compound as a complexing agent, was added and confirmed for dissolution, and 2,2'-dithiodianiline, which was an example of an aromatic amino compound as another complexing agent, was then added. When it became a light blue gel-like liquid, stannous methanesulfonate was quickly added.
- ⁇ -naphthol polyethoxylate (EO 10 mol) 3 g / L which is an example of a surfactant, was added to finish the adjustment of the plating solution.
- a plating solution having a methanesulfonic acid concentration of 2.64 mol / L and a tin ion concentration of 0.337 mol / L in the plating solution was prepared.
- the stannous methanesulfonate used in this example is prepared using the following Sn sheet material as a raw material.
- elemental analysis of the solder plating film formed on the surface of the Ni core ball is high frequency inductively coupled mass spectrometry (ICP-MS) for U and Th. Analysis) and other elements were performed by high-frequency inductively coupled plasma optical emission spectrometry (ICP-AES analysis).
- ICP-MS high frequency inductively coupled mass spectrometry
- ICP-AES analysis high-frequency inductively coupled plasma optical emission spectrometry
- the ⁇ dose of the Sn sheet material was measured in the same manner as the Ni ball except that the Sn sheet material was laid on a 300 mm ⁇ 300 mm flat shallow container.
- the ⁇ dose of the Ni core ball was measured in the same manner as the Ni ball described above.
- the sphericity of the Ni core ball was also measured under the same conditions as the Ni ball.
- Example 3 in which the Sn ball material was used for solder plating on the Ni ball, ⁇ The dose was less than 0.0010 cph / cm 2 .
- the Ni core ball of Example 3 was proved to reduce the ⁇ dose by forming a solder plating film by a plating method.
- Ni nuclear ball of Example 3 did not show an increase in the ⁇ dose even after 2 years had passed since its creation.
- the method of using the Ni ball or Ni core ball of the present invention is not limited to placing the Ni ball or Ni core ball directly on the paste and then joining it after applying the solder paste on the electrode. You may use for the foam solder etc. which disperse
- Ni balls or Ni core balls may be kneaded together with solder powder and flux and used as a solder paste containing Ni balls or Ni core balls in advance. At this time, two or more kinds of solder powders having different compositions and particle sizes may be added simultaneously.
- the composition of the solder paste, the solder alloy for foam solder, and the solder powder for solder paste used together with the Ni ball or Ni core ball is not particularly limited, but the ⁇ dose is 0.0200 cph / cm 2 or less. It is preferable.
Abstract
Description
(1)Uの含有量が5ppb以下であり、Thの含有量が5ppb以下であり、純度が99.9%以上99.995%以下であり、α線量が0.0200cph/cm2以下であり、PbまたはBiのいずれかの含有量、あるいは、PbおよびBiの合計の含有量が1ppm以上であり、真球度が0.90以上であるNiボール。
UおよびThは放射性同位元素であり、ソフトエラーを抑制するにはこれらの含有量を抑える必要がある。UおよびThの含有量は、Niボールのα線量を0.0200cph/cm2以下とするため、各々5ppb以下にする必要がある。また、現在または将来の高密度実装でのソフトエラーを抑制する観点から、UおよびThの含有量は、好ましくは、各々2ppb以下である。
本発明に係るNiボールは純度が3N以上4N5以下である。つまり、本発明に係るNiボールは不純物元素の含有量が50ppm以上である。Niボールを構成するNiの純度がこの範囲であると、Niボールの真球度が高まるための十分な量の結晶核を溶融Ni中に確保することができる。真球度が高まる理由は以下のように詳述される。
本発明に係るNiボールのα線量は0.0200cph/cm2以下である。これは、電子部品の高密度実装においてソフトエラーが問題にならない程度のα線量である。本発明では、Niボールを製造するために通常行っている工程に加え再度加熱処理を施している。このため、Ni材にわずかに残存する210Poが揮発し、Ni材と比較してNiボールの方がより一層低いα線量を示す。α線量は、更なる高密度実装でのソフトエラーを抑制する観点から、好ましくは0.0020cph/cm2以下であり、より好ましくは0.0010cph/cm2以下である。
不純物元素としては、Sn、Sb、Bi、Zn、Fe、Al、As、Ag、In、Cd、Cu、Pb、Au、P、S、U、Thなどが考えられるが、本発明に係るNiボールは、不純物元素の中でも特にPbまたはBiのいずれかの含有量、あるいは、PbおよびBiの合計の含有量が1ppm以上不純物元素として含有することが好ましい。本発明では、α線量を低減する上でPbまたはBiのいずれかの含有量、あるいは、PbおよびBiの含有量を極限まで低減する必要がない。
これは以下の理由による。
本発明に係るNiボールの形状は、スタンドオフ高さを制御する観点から真球度は0.90以上であることが好ましい。Niボールの真球度が0.90未満であると、Niボールが不定形状になるため、バンプ形成時に高さが不均一なバンプが形成され、接合不良が発生する可能性が高まる。真球度は、より好ましくは0.94以上である。本発明において、真球度とは真球からのずれを表す。真球度は、例えば、最小二乗中心法(LSC法)、最小領域中心法(MZC法)、最大内接中心法(MIC法)、最小外接中心法(MCC法)など種々の方法で求められる。
本発明に係るNiボールの直径は1~1000μmであることが好ましい。この範囲にあると、球状のNiボールを安定して製造でき、また、端子間が狭ピッチである場合の接続短絡を抑制することができる。ここで、例えば、本発明に係るNiボールがペーストに用いられるような場合、「Niボール」は「Niパウダ」と称されてもよい。「Niボール」が「Niパウダ」と称されるに用いるような場合、一般的に、Niボールの直径は1~300μmである。
はんだめっき被膜の組成は、合金の場合、Snを主成分とする鉛フリーはんだ合金の合金組成であれば特に限定されない。また、はんだめっき被膜としては、Snめっき被膜であってもよい。例えば、Sn、Sn-Ag合金、Sn-Cu合金、Sn-Ag-Cu合金、Sn-In合金、およびこれらに所定の合金元素を添加したものが挙げられる。いずれもSnの含有量が40質量%以上である。添加する合金元素としては、例えばAg、Cu、In、Ni、Co、Sb、Ge、P、Feなどがある。これらの中でも、はんだめっき被膜の合金組成は、落下衝撃特性の観点から、好ましくはSn-3Ag-0.5Cu合金である。
前述したNiボールの項で説明したように、UおよびThは放射性元素であり、ソフトエラーを抑制するには、はんだめっき被覆においてもこれらの含有量を抑える必要がある。UおよびThの含有量は、はんだめっき被膜のα線量を0.0200cph/cm2以下とするため、各々5ppb以下にする必要がある。また、現在または将来の高密度実装でのソフトエラーを抑制する観点から、UおよびThの含有量は、好ましくは、各々2ppb以下である。
本発明に係るNi核ボールのα線量は、Niボールと同様に0.0200cph/cm2以下である。これは、電子部品の高密度実装においてソフトエラーが問題にならない程度のα線量である。本発明に係るNi核ボールのα線量は、Ni核ボールを構成するNiボールのα線量が、前述のように0.0200cph/cm2以下であることに加え、Ni核ボールを構成するはんだめっき被膜のα線量が0.0200cph/cm2以下であることにより達成される。
実施例
純度が3NのNiワイヤ(α線量:0.0034cph/cm2、U:0.7ppb、Th:0.5ppb)をるつぼの中に投入し、1000℃の温度条件で45分間予備加熱を行った。その後、吐出温度を1600℃、好ましくは1700℃として、ガスアトマイズ法により、液状の溶融Niをノズルから高速度で噴霧し、霧状の溶融Niを冷却してNiボールを造粒した。これにより平均粒径が50μmのNiボールを作製した。作製したNiボールの元素分析結果、α線量および真球度を表1に示す。以下に、α線量および真球度の測定方法を詳述する。
α線量の測定にはガスフロー比例計数器のα線測定装置を用いた。測定サンプルは300mm×300mmの平面浅底容器にNiボールを敷き詰めたものである。この測定サンプルをα線測定装置内に入れ、PR-10ガスフローにて24時間放置した後、α線量を測定した。なお、測定に使用したPR-10ガス(アルゴン90%-メタン10%)は、PR-10ガスをガスボンベに充填してから3週間以上経過したものである。3週間以上経過したボンベを使用したのは、ガスボンベに進入する大気中のラドンによりα線が発生しないように、JEDEC(Joint Electron Device Engineering Council)で定められたα線測定方法の指針に従ったためである。
真球度はCNC画像測定システムで測定された。装置は、ミツトヨ社製のウルトラクイックビジョン、ULTRA QV350-PROである。
純度が4N5以下のNiワイヤ(α線量:0.0026cph/cm2、U:<0.5ppb、Th:<0.5ppb)を用いたこと以外、実施例1と同様にNiボールを作製し、元素分析およびα線量を測定した。結果を表1に示す。また、実施例2で作製したNiボールのSEM写真を図2に示す。SEM写真の倍率は300倍である。
純度が4N5より高い5NのNi板(α線量:<0.0010cph/cm2、U:<0.5ppb、Th:<0.5ppb)を用いたこと以外、実施例1と同様にNiボールを作製し、元素分析およびα線量を測定した。結果を表1に示す。また、比較例1で作製したNiボールのSEM写真を図3に示す。SEM写真の倍率は300倍である。
参考までに、純度が3NのNiワイヤ(α線量:0.0034cph/cm2、U:0.8ppb、Th:0.5ppb)の造粒前の元素分析結果およびα線量を表1に示す。
実施例1で製造したNiボールについて、以下の条件でSnを主成分とするはんだめっき被膜を形成してNi核ボールを作製した。
Claims (14)
- Uの含有量が5ppb以下であり、Thの含有量が5ppb以下であり、純度が99.9%以上99.995%以下であり、α線量が0.0200cph/cm2以下であり、PbまたはBiのいずれかの含有量、あるいは、PbおよびBiの合計の含有量が1ppm以上であり、真球度が0.90以上である
ことを特徴とするNiボール。 - α線量が0.0020cph/cm2以下である
ことを特徴とする請求項1に記載のNiボール。 - α線量が0.0010cph/cm2以下である
ことを特徴とする請求項1または2に記載のNiボール。 - 直径が1~1000μmである
ことを特徴とする請求項1~3のいずれか1項に記載のNiボール。 - 請求項1~4のいずれか1項に記載のNiボールがはんだ中に分散している
ことを特徴とするフォームはんだ。 - 請求項1~4のいずれか1項に記載のNiボールを含有している
ことを特徴とするはんだペースト。 - 請求項1~4のいずれか1項に記載のNiボールと、該Niボールを被覆するはんだめっきとを備える
ことを特徴とするNi核ボール。 - α線量が0.0200cph/cm2以下である
ことを特徴とする請求項7に記載のNi核ボール。 - α線量が0.0020cph/cm2以下である
ことを特徴とする請求項7に記載のNi核ボール。 - α線量が0.0010cph/cm2以下である
ことを特徴とする請求項7に記載のNi核ボール。 - 請求項7~10のいずれか1項に記載のNi核ボールがはんだ中に分散している
ことを特徴とするフォームはんだ。 - 請求項7~10のいずれか1項に記載のNi核ボールを含有している
ことを特徴とするはんだペースト。 - 請求項1~請求項4のいずれか1項に記載のNiボールを使用した
ことを特徴とするはんだ継手。 - 請求項7~請求項10のいずれか1項に記載のNi核ボールを使用した
ことを特徴とするはんだ継手。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/022,320 US9816160B2 (en) | 2013-09-19 | 2013-09-19 | Ni ball, Ni nuclear ball, solder joint, foam solder and solder paste |
PCT/JP2013/075288 WO2015040714A1 (ja) | 2013-09-19 | 2013-09-19 | Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト |
EP13893958.2A EP3047924B1 (en) | 2013-09-19 | 2013-09-19 | Nickel ball, nickel core ball, solder joint, foam solder and solder paste |
KR1020167009751A KR101645929B1 (ko) | 2013-09-19 | 2013-09-19 | Ni 볼, Ni 핵 볼, 납땜 조인트, 폼 땜납, 납땜 페이스트 |
CN201380081022.9A CN105745043B (zh) | 2013-09-19 | 2013-09-19 | Ni球、Ni芯球、钎焊接头、成形焊料、焊膏 |
JP2014501124A JP5510623B1 (ja) | 2013-09-19 | 2013-09-19 | Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト |
TW103125808A TWI611859B (zh) | 2013-09-19 | 2014-07-29 | 鎳球、鎳核球、焊接接頭、泡沫焊料、焊膏 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2013/075288 WO2015040714A1 (ja) | 2013-09-19 | 2013-09-19 | Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト |
Publications (1)
Publication Number | Publication Date |
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WO2015040714A1 true WO2015040714A1 (ja) | 2015-03-26 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2013/075288 WO2015040714A1 (ja) | 2013-09-19 | 2013-09-19 | Niボール、Ni核ボール、はんだ継手、フォームはんだ、はんだペースト |
Country Status (7)
Country | Link |
---|---|
US (1) | US9816160B2 (ja) |
EP (1) | EP3047924B1 (ja) |
JP (1) | JP5510623B1 (ja) |
KR (1) | KR101645929B1 (ja) |
CN (1) | CN105745043B (ja) |
TW (1) | TWI611859B (ja) |
WO (1) | WO2015040714A1 (ja) |
Families Citing this family (6)
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WO2015118613A1 (ja) * | 2014-02-04 | 2015-08-13 | 千住金属工業株式会社 | Niボール、Ni核ボール、はんだ継手、はんだペースト、およびフォームはんだ |
JP5692467B1 (ja) | 2014-02-04 | 2015-04-01 | 千住金属工業株式会社 | 金属球の製造方法、接合材料及び金属球 |
JP6459293B2 (ja) * | 2014-08-18 | 2019-01-30 | 日立金属株式会社 | はんだ被覆ボールおよびその製造方法 |
JP6428409B2 (ja) * | 2015-03-18 | 2018-11-28 | 三菱マテリアル株式会社 | ハンダ粉末及びこの粉末を用いたハンダ用ペースト |
US20220048790A1 (en) | 2018-09-26 | 2022-02-17 | Panasonic Intellectual Property Management Co., Ltd. | Method for producing nickel particles, method for producing nickel sulfate, and method for producing positive electrode active material for secondary batteries |
JP6836091B1 (ja) * | 2020-04-10 | 2021-02-24 | 千住金属工業株式会社 | はんだ合金、はんだ粉末、ソルダペースト、はんだボール、ソルダプリフォーム及びはんだ継手 |
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-
2013
- 2013-09-19 JP JP2014501124A patent/JP5510623B1/ja active Active
- 2013-09-19 CN CN201380081022.9A patent/CN105745043B/zh active Active
- 2013-09-19 KR KR1020167009751A patent/KR101645929B1/ko active IP Right Grant
- 2013-09-19 WO PCT/JP2013/075288 patent/WO2015040714A1/ja active Application Filing
- 2013-09-19 US US15/022,320 patent/US9816160B2/en active Active
- 2013-09-19 EP EP13893958.2A patent/EP3047924B1/en active Active
-
2014
- 2014-07-29 TW TW103125808A patent/TWI611859B/zh active
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JP2005161338A (ja) * | 2003-12-01 | 2005-06-23 | Hitachi Metals Ltd | はんだシート |
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See also references of EP3047924A4 |
Also Published As
Publication number | Publication date |
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TW201521934A (zh) | 2015-06-16 |
EP3047924A4 (en) | 2017-06-07 |
JPWO2015040714A1 (ja) | 2017-03-02 |
TWI611859B (zh) | 2018-01-21 |
US9816160B2 (en) | 2017-11-14 |
EP3047924A1 (en) | 2016-07-27 |
CN105745043B (zh) | 2017-11-24 |
JP5510623B1 (ja) | 2014-06-04 |
US20160304992A1 (en) | 2016-10-20 |
EP3047924B1 (en) | 2018-08-22 |
CN105745043A (zh) | 2016-07-06 |
KR101645929B1 (ko) | 2016-08-04 |
KR20160049019A (ko) | 2016-05-04 |
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