WO2020262040A1 - はんだ合金、鋳造物、形成物およびはんだ継手 - Google Patents
はんだ合金、鋳造物、形成物およびはんだ継手 Download PDFInfo
- Publication number
- WO2020262040A1 WO2020262040A1 PCT/JP2020/023190 JP2020023190W WO2020262040A1 WO 2020262040 A1 WO2020262040 A1 WO 2020262040A1 JP 2020023190 W JP2020023190 W JP 2020023190W WO 2020262040 A1 WO2020262040 A1 WO 2020262040A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solder
- less
- alloy
- solder alloy
- equation
- Prior art date
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/027—Casting heavy metals with low melting point, i.e. less than 1000 degrees C, e.g. Zn 419 degrees C, Pb 327 degrees C, Sn 232 degrees C
-
- 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
-
- 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
- B23K35/0227—Rods, wires
-
- 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
-
- 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
-
- 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
-
- 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
- C22C13/02—Alloys based on tin with antimony or bismuth as the next major constituent
Definitions
- the present invention relates to solder alloys, castings, formations and solder joints suitable for casting.
- Flow soldering is a method of soldering by applying the jet surface of a solder bath to the connection surface side of a printed circuit board.
- Dip soldering is a method in which insert parts such as coil parts are inserted into a substrate and immersed in a solder bath for soldering. As a pretreatment, the insulating film is removed and solder pre-plating is also selected. Has been done.
- solder bath is required for flow soldering and dip soldering. Since the solder bath is exposed to the atmosphere for a long time, the dross generated in the solder tank must be removed at regular intervals. In addition, the molten solder in the solder bath is consumed by soldering. Therefore, the solder alloy is periodically supplied to the solder bath. Generally, bar solder is used to supply the solder alloy.
- the continuous casting method is a method in which raw materials are put into a melting furnace to be melted, and the molten solder in the melting furnace is cast into a groove of a rotary mold.
- the mold used in the continuous casting method include a shape in which a groove is provided in the central portion in the width direction of the annular plate. The molten solder is cast into the groove of the rotary mold and then solidified, and is guided from the mold to the cutting process. The induced continuous casting is cut to a predetermined length to become a bar solder.
- Patent Document 1 A technique relating to a continuous casting method for a solder alloy is described in, for example, Patent Document 1.
- a chiller through which cooling water is passed is brought into close contact with the outside of the mold, and the cooling rate up to 280 ° C. is 3 ° C./s or more, preferably 20 ° C. It is described that the structure of the eutectic portion is made finer at / s or more, more preferably 50 ° C./s or more.
- Au may be used as a high-temperature Pb-free solder alloy, it is expensive and difficult to process.
- Sn—Cu based solder alloys are mainly used for bar soldering.
- Sn—Cu solder alloys are known to form intermetallic compounds in the solder alloys.
- the continuous casting method is usually performed in the atmosphere, if the Sn—Cu solder alloy is cast as it is by the continuous casting method, the molten solder is oxidized by oxygen in the atmosphere and the fluidity of the molten solder deteriorates. , The desired casting cannot be obtained.
- Patent Document 2 describes a Sn—Cu—P—Ge—Ni solder alloy containing P and Ge.
- the upper limit values of the Cu and Ni contents are limited from the viewpoint of suppressing an increase in the liquidus temperature. Further, the document describes that if Ni is added in a predetermined amount or more, there is a concern that the fluidity of the molten solder may be hindered. It is described that the addition of a large amount of P and Ge also increases the viscosity of the molten solder and hinders the fluidity of the molten solder.
- the invention described in Patent Document 2 is an excellent invention in which the fluidity of the molten solder is taken into consideration.
- An object of the invention described in Patent Document 2 is to provide a solder alloy having improved solderability in a Sn—Cu-based lead-free solder alloy having poor wettability. Then, when the fluidity of the molten solder decreases, the soldering work becomes difficult.
- the document defines upper limits for all elements of Cu, Ni, P, and Ge.
- the invention described in Patent Document 2 is said to solve a problem when mounting an electronic component on a printed circuit board mainly by flow soldering.
- Flow soldering is based on the premise that the molten solder in the solder bath gets wet with the electrodes of electronic components and substrates. Since flux is used as an aid to wettability in electronic components and substrate electrodes used for flow soldering, high wettability is required for solder alloys used for flow soldering. Therefore, in the invention described in Patent Document 2, the fluidity of the molten solder is controlled in order to improve the wettability.
- the continuous casting method if the molten solder gets wet on the rotary mold whose main components are Fe and Al, it becomes difficult for the solder alloy after solidification to be released from the rotary mold, so it is assumed that the rotary mold will not get wet. There is. Not surprisingly, casting does not use flux.
- the fluidity of the molten solder required by the continuous casting method is controlled so that a casting having a desired thickness can be obtained during solidification. Therefore, since the preconditions for controlling the fluidity of the molten solder differ greatly between flow soldering and the continuous casting method, it is necessary to design an alloy suitable for the continuous casting method in order to obtain a desired continuous casting. Become.
- the amount of molten solder used for flow soldering is very large, several hundred kg.
- the temperature of the molten solder may drop due to contact with the substrate transported by a belt conveyor or the like, and it is required to suppress this. That is, the temperature drop of the molten solder in the flow soldering is suppressed by making the heat capacity of the molten solder overwhelmingly larger than the heat capacity of the electronic components and the substrate. Therefore, in flow soldering, it is not necessary to lower the liquidus temperature more than necessary.
- the amount of solder supplied to the mold is several tens to several hundreds of g, which is 1/1000 or less as compared with flow soldering.
- the heat capacity of the molten solder poured into the rotary mold is suppressed by reducing the supply amount so that the temperature starts to drop and solidifies from the moment it comes into contact with the rotary mold. If the liquidus temperature is too high, the solder will harden the moment it touches the mold, making it impossible to achieve the desired thickness of the casting.
- solder alloy described in Patent Document 2 is suitable for flow soldering as described above, the alloy is designed in consideration of the fluidity of the molten solder and the liquidus temperature required for the continuous casting method. is not. Therefore, the solder alloy described in Patent Document 2 cannot be directly applied to the continuous casting method. Further, from the viewpoint of improving versatility, it is also required to obtain a desired casting not only by a continuous casting method but also by a casting method using a fixed mold.
- an object of the present invention is to provide a solder alloy, a casting, a formation, and a solder joint capable of casting a casting having a desired thickness.
- the inventors first examined the contents of Cu and Ni in the solder alloy described in Patent Document 2 in order to further suppress the increase in the liquidus temperature. If the contents of Cu and Ni are too high, the liquidus temperature rises. The present inventors paid attention to the total amount of Cu and Ni in addition to optimizing each of the Cu content and the Ni content in the continuous casting method.
- Patent Document 2 describes that if the contents of P and Ge are too large, the viscosity of the molten solder increases and the fluidity of the molten solder is impaired.
- this inhibitory factor is intended to be applied to flow soldering and is not always suitable for casting. Therefore, the present inventors considered that the fluidity of the molten solder suitable for casting could not be obtained only by controlling the content of each, and paid attention to the total amount of P and Ge.
- the present inventors have independently examined the Cu and Ni groups and the P and Ge groups, respectively.
- the liquidus temperature of the solder alloy suitable for casting it is necessary to design the alloy by considering that the two groups are interacting with each other.
- the present inventors focused on the balance between the two groups and conducted a more detailed study. As a result, the present invention is completed based on the finding that when these groups satisfy a predetermined relational expression, the viscosity of the molten solder suitable for the casting method can be realized and a casting having a desired plate thickness can be obtained. did.
- the present invention obtained from these findings is as follows. (1) In terms of mass%, Cu: 0.1 to 2.0%, Ni: 0.01 to 0.4%, P: 0.001 to 0.08%, Ge: 0.001 to 0.08%. , And a solder alloy having an alloy composition in which the balance is Sn, and the alloy composition satisfies the following equations (1) to (3).
- the alloy composition further comprises a group consisting of at least one of Bi, In, Zn, and Ag in a total of 5% or less, and at least one of Mn, Cr, Co, Fe, Si, Ti, and a rare earth element.
- the solder alloy according to (1) above which contains at least one selected from at least one group consisting of 1% or less of the seeds in total.
- FIG. 1 is a diagram showing the scope of the present invention with the equation (2) as the x-axis and the equation (1) as the y-axis.
- FIG. 2 is an enlarged view of FIG. 1 in the range of 0 to 0.01 on the x-axis and 0 to 1 on the y-axis.
- solder alloy (1) Cu: 0.1-2.0%, Ni: 0.01-0.4% Cu and Ni are essential elements capable of controlling the liquidus temperature of the solder alloy. When both Cu and Ni are within the above range, the fluidity of the molten solder is optimized, so that a casting having a desired plate thickness can be obtained.
- the lower limit of the Cu content is 0.1% or more, preferably 0.14% or more, more preferably 0.5% or more, and further preferably 0.6% or more.
- the lower limit of the Ni content is 0.01% or more, preferably 0.02% or more, and more preferably 0.03% or more.
- the liquidus temperature rises and the fluidity decreases.
- the upper limit of the Cu content is 2.0% or less, preferably 1.0% or less, more preferably 0.89 or less, and further preferably 0.75% or less.
- the upper limit of the Ni content is 0.4% or less, preferably 0.1% or less, more preferably 0.07% or less, and further preferably 0.055% or less.
- P: 0.001 to 0.08%, Ge: 0.001 to 0.08% P and Ge are essential elements that can suppress the oxidation of the solder alloy and control the fluidity of the molten solder. If at least one of the P content and the Ge content is less than 0.001%, the oxidation inhibitory effect cannot be obtained.
- the lower limit of the P content is 0.001% or more, preferably 0.002% or more.
- the lower limit of the Ge content is 0.001% or more, preferably 0.003% or more.
- the deterioration of the fluidity due to the oxidation of Sn is suppressed, but the liquidus temperature becomes high.
- the upper limit of the P content is 0.08% or less, preferably 0.06% or less, more preferably 0.01% or less, further preferably 0.005% or less, and particularly preferably 0. It is less than .003%.
- the upper limit of the Ge content is 0.08% or less, preferably 0.07% or less, more preferably 0.06% or less, still more preferably 0.01% or less, and particularly preferably. It is 0.007% or less, and most preferably 0.005% or less.
- Equations (1) to (3) (Cu + 5Ni) ⁇ 0.945% Equation (1) (P + Ge) ⁇ 0.15% Equation (2) 2.0 ⁇ (Cu + 5Ni) / (P + Ge) ⁇ 1000 (3) )
- Cu, Ni, P, and Ge each represent the content (%) in the solder alloy.
- each essential element of the solder alloy according to the present invention has an optimum content for controlling the liquidus temperature of the solder alloy and the fluidity of the molten solder.
- the content of each of the above essential elements is determined in order to suppress deterioration of the fluidity of the molten solder.
- the constituent elements other than Sn are divided into element groups exhibiting similar effects, and each group is divided into the above equations (1) to (3).
- Equation (1) is an equation representing the balance between Cu and Ni in the solder alloy. As described above, Cu and Ni are elements whose liquidus temperature can be adjusted. Further, since the contents of both elements determine the amount of precipitation of the compound produced during solidification, it is important to control the total amount of the contents of both elements in order to optimize the fluidity of the molten solder.
- the liquidus temperature rises. Even if the formula (1) exceeds 0.945%, it is within the permissible range for flow soldering, but in order to produce a desired casting, the upper limit of the formula (1) is 0.945% or less. It is necessary. It is preferably 0.940% or less, and more preferably 0.875% or less.
- the lower limit of the left side of the equation (1) is not particularly limited, but is preferably 0.150% or more, more preferably 0.240 or more, still more preferably 0.250% or more, still more preferably 0. It is 650 or more, particularly preferably 0.750% or more, and most preferably 0.850 or more.
- Equation (2) is an equation representing the total amount of P and Ge in the solder alloy. All of these elements can control the fluidity of the molten solder by suppressing oxidation, but since the reaction rates in each atmosphere are different, the total content of both elements should be controlled. Is important for optimizing the fluidity of molten solder.
- the liquidus temperature of the solder alloy rises.
- the upper limit of the formula (2) is 0.15% or less, preferably 0.12 or less, more preferably 0.085% or less, still more preferably 0.083% or less, and even more preferably. It is 0.050% or less, particularly preferably 0.015% or less, and most preferably 0.013% or less.
- the lower limit of the formula (2) is not particularly limited, but is preferably 0.002% or more, more preferably 0.004% or more, still more preferably 0.006% or more, and particularly preferably 0.008. That is all.
- Equation (3) is an equation representing the balance between the group of Cu and Ni and the group of P and Ge in the solder alloy. Although the elements belonging to each group have different factors for controlling the viscosity of the molten solder, it is considered that the two groups interact with each other in determining the viscosity of the molten solder. Therefore, in order to control the viscosity of the molten solder, it is necessary to consider the balance between the above two groups.
- the lower limit of the formula (3) is 2.0 or more, preferably 5.67 or more, more preferably 10.00 or more, still more preferably 10.24 or more, and even more preferably 18.75.
- the above is particularly preferable, 31.25 or more, and most preferably 56.67 or more.
- the lower limit of the equation (3) may be 65.38 or more, 81.25 or more, 93.75 or more, and 106.25 or more.
- the upper limit of the formula (3) is 1000 or less, preferably 472.5 or less, more preferably 470.00 or less, still more preferably 425.00 or more, still more preferably 212.50 or less. Yes, particularly preferably 141.67 or less, and most preferably 118.13 or less. Further, it is 117.50 or less, and may be 109.38 or less.
- the rare earth element is 17 kinds of elements including Sc and Y belonging to Group 3 in the periodic table and 15 elements of Group 3 lanthanum corresponding to atomic numbers 57 to 71.
- At least one of Bi, In, Sb, Zn, Ag, Mn, Cr, Co, Fe, Si, Ti, and a rare earth element may be contained.
- the content of each element is preferably 5% or less in total for at least one of Bi, In, Sb, Zn, and Ag, and at least one of Mn, Cr, Co, Fe, Si, Ti, and rare earth elements.
- the total for seeds is less than 1%. More preferably, at least one of Bi, In, Sb, Zn, and Ag is 1% or less in total, and at least one of Mn, Cr, Co, Fe, Si, Ti, and rare earth elements is 0.5 in total. % Or less.
- Sn The rest of the solder alloy according to the present invention is Sn.
- unavoidable impurities may be contained. Even if it contains unavoidable impurities, it does not affect the above-mentioned effects. Further, as will be described later, even if an element not contained in the present invention is contained as an unavoidable impurity, the above-mentioned effect is not affected.
- the solder alloy according to the present invention should not contain Al in order to avoid deterioration of wettability due to oxidation.
- the casting according to the present invention has a desired plate thickness because it has an alloy composition of the solder alloy according to the present invention.
- Examples of the casting include bar solder cut to a predetermined length, as will be described later.
- the formed product according to the present invention is a product formed from the casting according to the present invention.
- wire solder obtained by processing a casting solder in a solder, ring shape, and tubular shape can be mentioned.
- solder powder obtained by melting and spraying, and those formed on solder balls are also included.
- solder joint The solder joint according to the present invention is used, for example, for connecting an IC chip and its substrate (interposer) in a semiconductor package, or for connecting a semiconductor package and a printed wiring board, using the solder alloy according to the present invention. Ru.
- the method for manufacturing a solder alloy according to the present invention is, for example, a continuous casting method.
- the continuous casting method first, the raw material is put into a melting furnace so as to have a predetermined alloy composition and heated to about 350 to 500 ° C. to melt the raw material.
- the molten solder in the melting furnace is continuously cast into a rotary mold.
- the rotary mold has, for example, a shape in which a groove is provided in the central portion in the width direction of the annular plate.
- the molten solder is cast into the groove of the mold while rotating the rotary mold.
- the amount of molten solder supplied to the mold is appropriately adjusted according to the rotation speed of the mold.
- the molten solder cast into the mold is cooled to about 150 ° C. at a cooling rate of about 10 to 50 ° C./s.
- the bottom of the rotary mold is immersed in cooling water, or the cooling water is circulated in the mold using a chiller or the like.
- the cooled solder alloy is guided to the outside of the mold via a guide and cut to a predetermined length.
- the solder alloy that has reached the guide is cooled to about 80 to 200 ° C. Since the viscosity of the molten solder is controlled in the solder alloy of the present invention, a continuous casting having a desired plate thickness can be produced.
- the casting method using a fixed mold may be a conventional method.
- the raw materials are melted so as to have a predetermined alloy composition as described above, then poured into a fixed mold and cooled at the above cooling rate. After cooling, the solder alloy can be taken out from the mold and manufactured.
- the continuous casting was guided from the rotary mold to the outside of the rotary mold by a guide. Then, it was cut to an appropriate length to produce a total of 10 m of bar solder including a bar solder having a width of 10 mm and a length of 300 mm.
- the evaluation method will be described below.
- FIGS. 1 and 2 extract examples that satisfy equations (1) to (3) and comparative examples that do not satisfy at least one of equations (1) to (3), and show (2).
- FIG. 2 is an enlarged view of FIG. 1 in the range of 0 to 0.01 on the x-axis and 0 to 1 on the y-axis.
- “ ⁇ ” represents an embodiment and “x” represents a comparative example.
- the area surrounded by the thick line is the range surrounded by the equations (1) to (3).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Continuous Casting (AREA)
- Arc Welding In General (AREA)
Abstract
Description
(1)質量%で、Cu:0.1~2.0%、Ni:0.01~0.4%、P:0.001~0.08%、Ge:0.001~0.08%、および残部がSnからなる合金組成を有し、前記合金組成は下記(1)式~(3)式を満たすことを特徴とするはんだ合金。
(P+Ge)≦0.15% (2)式
2.0≦(Cu+5Ni)/(P+Ge)≦1000 (3)式
(1)式~(3)式中、Cu、Ni、P、およびGeは、各々はんだ合金中での含有量(質量%)を表す。
(4)上記(3)に記載の鋳造物から形成されてなる形成物。
(1) Cu:0.1~2.0%、Ni:0.01~0.4%
CuおよびNiは、はんだ合金の液相線温度を制御することができる必須元素である。CuおよびNiがいずれも上記範囲内であると溶融はんだの流動性が最適化されるため、所望の板厚を有する鋳造物が得られる。Cu含有量の下限は0.1%以上であり、好ましくは0.14%以上であり、より好ましくは0.5%以上であり、更に好ましくは0.6%以上である。Ni含有量の下限は0.01%以上であり、好ましくは0.02%以上であり、より好ましくは0.03%以上である。一方、Cu含有量およびNi含有量の少なくとも一方が各々の上限値を超えると液相線温度が高くなり、流動性が低下する。Cu含有量の上限は2.0%以下であり、好ましくは1.0%以下であり、より好ましくは0.89以下であり、更に好ましくは0.75%以下である。Ni含有量の上限は0.4%以下であり、好ましくは0.1%以下であり、より好ましくは0.07%以下であり、更に好ましくは0.055%以下である。
PおよびGeは、はんだ合金の酸化を抑制して溶融はんだの流動性を制御することができる必須元素である。P含有量およびGe含有量の少なくとも一方が0.001%未満であると、酸化抑制効果が得られない。P含有量の下限は0.001%以上であり、好ましくは0.002%以上である。Ge含有量の下限は0.001%以上であり、好ましくは0.003%以上である。一方、P含有量およびGe含有量の少なくとも一方が0.08%を超えると、Snの酸化による流動性の劣化は抑制されるものの、液相線温度が高くなる。P含有量の上限は0.08%以下であり、好ましくは0.06%以下であり、より好ましくは0.01%以下であり、更に好ましくは0.005%以下であり、特に好ましくは0.003%以下である。Ge含有量の上限は0.08%以下であり、好ましくは0.07%以下であり、より好ましくは0.06%以下であり、更により好ましくは0.01%以下であり、特に好ましくは0.007%以下であり、最も好ましくは0.005%以下である。
(Cu+5Ni)≦0.945% (1)式
(P+Ge)≦0.15% (2)式
2.0≦(Cu+5Ni)/(P+Ge)≦1000 (3)式
(1)式~(3)式中、Cu、Ni、P、およびGeは、各々はんだ合金中での含有量(%)を表す。
(1)式は、はんだ合金中のCuとNiのバランスを表す式である。前述のように、CuとNiは液相線温度を調整することができる元素である。また、両元素の含有量が凝固時に生成する化合物の析出量を決定するため、両元素の含有量の合計量を制御することは溶融はんだの流動性を適正化する上で重要となる。
(2)式は、はんだ合金中のPとGeの合計量を表す式である。これらの元素は、いずれも酸化を抑制することによって溶融はんだの流動性を制御することができるが、各々の大気中での反応速度が異なるため、両元素の含有量の合計量を制御することは溶融はんだの流動性を適正化する上で重要となる。
(3)式は、はんだ合金中での、CuとNiの群とPとGeの群とのバランスを表す式である。各群に属する元素は、各々溶融はんだの粘性を制御する要因が異なるものの、溶融はんだの粘性を決定づけるにあたり、両群は相互的に作用すると考えられる。このため、溶融はんだの粘性を制御するためには、上記2群のバランスを考慮する必要がある。
これらの元素は、Bi、In、Sb、Zn、およびAgの少なくとも1種では合計で5%以下、Mn、Cr、Co、Fe、Si、Ti、および希土類元素の少なくとも1種では合計で1%以下、であれば、本発明に係るはんだ合金の鋳造性に影響を及ぼすことがない。本発明において希土類元素とは、周期律表において第3族に属するSc、Yと原子番号57~71に該当するランタン族の15個の元素を合わせた17種の元素のことである。
本発明に係るはんだ合金の残部はSnである。前述の元素の他に不可避的不純物を含有してもよい。不可避的不純物を含有する場合であっても、前述の効果に影響することはない。また、後述するように、本発明では含有しない元素が不可避的不純物として含有されても前述の効果に影響することはない。
本発明に係るはんだ合金は、酸化による濡れ性の劣化を回避するため、Alを含有しない方がよい。
本発明に係る鋳造物は、本発明に係るはんだ合金の合金組成を有するため、所望の板厚を有する。鋳造物としては、後述するように、所定の長さに切断された棒はんだなどが挙げられる。
本発明に係る形成物は、本発明に係る鋳造物から形成された物である。例えば、鋳造物を加工して得られた線はんだ、やに入りはんだ、リング形状や筒形状の形態が挙げられる。これに加えて、溶融および噴霧により得られたはんだ粉末、はんだボールに形成された物も含む。
本発明に係るはんだ継手は、本発明に係るはんだ合金を用いて、例えば、半導体パッケージにおけるICチップとその基板(インターポーザ)との接続、或いは半導体パッケージとプリント配線板との接続に使用される。
本発明に係るはんだ合金の製造方法は、例えば、連続鋳造法にて製造される。連続鋳造法は、まず、所定の合金組成となるように原材料を溶融炉に投入し350~500℃程度に加熱して原材料を溶融する。
回転鋳型は、例えば環状板の幅方向中央部に溝が設けられた形状である。溶融はんだを鋳込む際には、回転鋳型を回転させながら溶融はんだが鋳型の溝に鋳込まれる。鋳型への溶融はんだの供給量は、鋳型の回転数に応じて適宜調整する。
本発明の効果を立証するため、下記により棒はんだを作製して評価した。溶融炉に原材料を秤量し、溶融炉の設定温度を450℃として溶融した後、水を循環させた回転鋳型の溝に溶融はんだを鋳込んだ。冷却速度は概ね30℃/sであった。
作製した棒はんだの板厚をノギスで測定した。すべての棒はんだが7mm±1mmの範囲に入る場合を「○」とし、上記範囲に入らないものがある場合には「×」とした。「○」であれば実用上問題ない。
Claims (5)
- 質量%で、Cu:0.1~2.0%、Ni:0.01~0.4%、P:0.001~0.08%、Ge:0.001~0.08%、および残部がSnからなる合金組成を有し、前記合金組成は下記(1)式~(3)式を満たすことを特徴とするはんだ合金。
(Cu+5Ni)≦0.945% (1)式
(P+Ge)≦0.15% (2)式
2.0≦(Cu+5Ni)/(P+Ge)≦1000 (3)式
前記(1)式~(3)式中、Cu、Ni、P、およびGeは、各々はんだ合金中での含有量(質量%)を表す。 - 前記合金組成は、更に、Bi、In、Zn、およびAgの少なくとも1種を合計で5%以下からなる群、ならびにMn、Cr、Co、Fe、Si、Ti、および希土類元素の少なくとも1種を合計で1%以下からなる群、の少なくとも1群から選択される少なくとも1種を含有する、請求項1に記載のはんだ合金。
- 請求項1または2に記載のはんだ合金を有する鋳造物。
- 請求項3に記載の鋳造物から形成されてなる形成物。
- 請求項3に記載の鋳造物を用いてなるはんだ継手。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20831263.7A EP3940096A4 (en) | 2019-06-28 | 2020-06-12 | BRAZE ALLOY, SLURRY, MOLDING ARTICLE AND BRAZE JOINT |
CN202080029156.6A CN113727807B (zh) | 2019-06-28 | 2020-06-12 | 软钎料合金、铸造物、形成物和钎焊接头 |
KR1020217034074A KR102345176B1 (ko) | 2019-06-28 | 2020-06-12 | 땜납 합금, 주조물, 형성물 및 납땜 이음 |
US17/603,500 US11607753B2 (en) | 2019-06-28 | 2020-06-12 | Solder alloy, cast article, formed article, and solder joint |
BR112021026430-2A BR112021026430B1 (pt) | 2019-06-28 | 2020-06-12 | Liga de solda, produto fundido, produto conformado e junta de solda |
MX2021015960A MX2021015960A (es) | 2019-06-28 | 2020-06-12 | Aleacion de soldadura, articulo fundido, articulo formado y junta de soldadura. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019-121359 | 2019-06-28 | ||
JP2019121359A JP6721851B1 (ja) | 2019-06-28 | 2019-06-28 | はんだ合金、鋳造物、形成物およびはんだ継手 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020262040A1 true WO2020262040A1 (ja) | 2020-12-30 |
Family
ID=71523938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2020/023190 WO2020262040A1 (ja) | 2019-06-28 | 2020-06-12 | はんだ合金、鋳造物、形成物およびはんだ継手 |
Country Status (9)
Country | Link |
---|---|
US (1) | US11607753B2 (ja) |
EP (1) | EP3940096A4 (ja) |
JP (1) | JP6721851B1 (ja) |
KR (1) | KR102345176B1 (ja) |
CN (1) | CN113727807B (ja) |
BR (1) | BR112021026430B1 (ja) |
MX (1) | MX2021015960A (ja) |
TW (1) | TWI733502B (ja) |
WO (1) | WO2020262040A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4140636A1 (en) * | 2021-08-27 | 2023-03-01 | Senju Metal Industry Co., Ltd. | Solder alloy and solder joint |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001191196A (ja) * | 1999-10-29 | 2001-07-17 | Topy Ind Ltd | ぬれ性、熱サイクル特性及び耐酸化性に優れたSn基Pbフリー半田 |
JP2003094195A (ja) | 2001-06-28 | 2003-04-02 | Senju Metal Ind Co Ltd | 鉛フリーはんだ合金 |
JP2008521619A (ja) * | 2004-12-01 | 2008-06-26 | アルファ フライ リミテッド | はんだ合金 |
JP2014138065A (ja) * | 2013-01-16 | 2014-07-28 | Senju Metal Ind Co Ltd | プリント基板のはんだ付け方法 |
JP2017196647A (ja) | 2016-04-28 | 2017-11-02 | 住友金属鉱山株式会社 | Au−Sn−Ag−α系はんだ合金及びそのはんだ材料並びに該はんだ材料を用いて接合又は封止された実装基板 |
JP2018043264A (ja) * | 2016-09-13 | 2018-03-22 | 千住金属工業株式会社 | はんだ合金、はんだボールおよびはんだ継手 |
JP6369620B1 (ja) * | 2017-12-31 | 2018-08-08 | 千住金属工業株式会社 | はんだ合金 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6179935B1 (en) * | 1997-04-16 | 2001-01-30 | Fuji Electric Co., Ltd. | Solder alloys |
US8216395B2 (en) * | 2001-06-28 | 2012-07-10 | Senju Metal Industry Co., Ltd. | Lead-free solder alloy |
WO2007018288A1 (ja) * | 2005-08-11 | 2007-02-15 | Senju Metal Industry Co., Ltd. | 鉛フリーソルダペーストとその応用 |
US8641964B2 (en) | 2005-08-24 | 2014-02-04 | Fry's Metals, Inc. | Solder alloy |
KR101397271B1 (ko) | 2006-03-09 | 2014-05-20 | 닛데쓰스미킹 마이크로 메탈 가부시키가이샤 | 무연 솔더 합금, 솔더 볼 및 전자 부재와, 자동차 탑재전자 부재용 무연 솔더 합금, 솔더 볼 및 전자 부재 |
CN100439028C (zh) | 2007-01-24 | 2008-12-03 | 太仓市南仓金属材料有限公司 | 一种无铅软钎锡焊料 |
US8845826B2 (en) * | 2007-07-13 | 2014-09-30 | Senju Metal Industry Co., Ltd. | Lead-free solder for vehicles and a vehicle-mounted electronic circuit using the solder |
CN101342642A (zh) * | 2008-08-25 | 2009-01-14 | 杨嘉骥 | 一种抗氧化低银无铅焊料 |
WO2012131861A1 (ja) * | 2011-03-28 | 2012-10-04 | 千住金属工業株式会社 | 鉛フリーはんだボール |
CN103042315B (zh) * | 2013-01-22 | 2015-05-27 | 马莒生 | 耐热耐湿低熔点无铅焊料合金 |
WO2015037279A1 (ja) * | 2013-09-11 | 2015-03-19 | 千住金属工業株式会社 | 鉛フリーはんだ、鉛フリーはんだボール、この鉛フリーはんだを使用したはんだ継手およびこのはんだ継手を有する半導体回路 |
JP6365653B2 (ja) * | 2016-08-19 | 2018-08-01 | 千住金属工業株式会社 | はんだ合金、はんだ継手およびはんだ付け方法 |
EP3381601B1 (en) * | 2016-09-13 | 2020-12-02 | Senju Metal Industry Co., Ltd | Solder alloy, solder ball and solder joint |
CN111936264A (zh) * | 2018-04-13 | 2020-11-13 | 千住金属工业株式会社 | 焊膏 |
JP6439893B1 (ja) * | 2018-05-25 | 2018-12-19 | 千住金属工業株式会社 | ハンダボール、ハンダ継手および接合方法 |
CN108941969A (zh) * | 2018-07-20 | 2018-12-07 | 广东中实金属有限公司 | 一种适用于压敏电阻的无铅焊料及其制备方法 |
JP6579253B1 (ja) * | 2018-11-09 | 2019-09-25 | 千住金属工業株式会社 | ハンダボール、ハンダ継手および接合方法 |
-
2019
- 2019-06-28 JP JP2019121359A patent/JP6721851B1/ja active Active
-
2020
- 2020-06-12 EP EP20831263.7A patent/EP3940096A4/en active Pending
- 2020-06-12 CN CN202080029156.6A patent/CN113727807B/zh active Active
- 2020-06-12 US US17/603,500 patent/US11607753B2/en active Active
- 2020-06-12 BR BR112021026430-2A patent/BR112021026430B1/pt active IP Right Grant
- 2020-06-12 KR KR1020217034074A patent/KR102345176B1/ko active IP Right Grant
- 2020-06-12 WO PCT/JP2020/023190 patent/WO2020262040A1/ja unknown
- 2020-06-12 MX MX2021015960A patent/MX2021015960A/es unknown
- 2020-06-22 TW TW109121061A patent/TWI733502B/zh active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001191196A (ja) * | 1999-10-29 | 2001-07-17 | Topy Ind Ltd | ぬれ性、熱サイクル特性及び耐酸化性に優れたSn基Pbフリー半田 |
JP2003094195A (ja) | 2001-06-28 | 2003-04-02 | Senju Metal Ind Co Ltd | 鉛フリーはんだ合金 |
JP2008521619A (ja) * | 2004-12-01 | 2008-06-26 | アルファ フライ リミテッド | はんだ合金 |
JP2014138065A (ja) * | 2013-01-16 | 2014-07-28 | Senju Metal Ind Co Ltd | プリント基板のはんだ付け方法 |
JP2017196647A (ja) | 2016-04-28 | 2017-11-02 | 住友金属鉱山株式会社 | Au−Sn−Ag−α系はんだ合金及びそのはんだ材料並びに該はんだ材料を用いて接合又は封止された実装基板 |
JP2018043264A (ja) * | 2016-09-13 | 2018-03-22 | 千住金属工業株式会社 | はんだ合金、はんだボールおよびはんだ継手 |
JP6369620B1 (ja) * | 2017-12-31 | 2018-08-08 | 千住金属工業株式会社 | はんだ合金 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3940096A4 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4140636A1 (en) * | 2021-08-27 | 2023-03-01 | Senju Metal Industry Co., Ltd. | Solder alloy and solder joint |
CN115927908A (zh) * | 2021-08-27 | 2023-04-07 | 千住金属工业株式会社 | 软钎料合金和钎焊接头 |
US11992902B2 (en) | 2021-08-27 | 2024-05-28 | Senju Metal Industry Co., Ltd. | Solder alloy and solder joint |
Also Published As
Publication number | Publication date |
---|---|
BR112021026430B1 (pt) | 2023-03-28 |
KR102345176B1 (ko) | 2021-12-30 |
JP2021007951A (ja) | 2021-01-28 |
CN113727807A (zh) | 2021-11-30 |
EP3940096A1 (en) | 2022-01-19 |
US20220143761A1 (en) | 2022-05-12 |
CN113727807B (zh) | 2023-01-06 |
MX2021015960A (es) | 2022-02-03 |
BR112021026430A2 (pt) | 2022-02-15 |
EP3940096A4 (en) | 2022-09-07 |
JP6721851B1 (ja) | 2020-07-15 |
TW202106434A (zh) | 2021-02-16 |
TWI733502B (zh) | 2021-07-11 |
KR20210132209A (ko) | 2021-11-03 |
US11607753B2 (en) | 2023-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN110612175B (zh) | 软钎料合金 | |
US6179935B1 (en) | Solder alloys | |
WO2007079671A1 (fr) | Brasure sans plomb et son procede de preparation | |
WO2012077415A1 (ja) | Znを主成分とするPbフリーはんだ合金 | |
JP2007301570A (ja) | はんだ合金 | |
WO2020262040A1 (ja) | はんだ合金、鋳造物、形成物およびはんだ継手 | |
WO2007082459A1 (fr) | Soudure exempte de plomb et son procédé de préparation | |
JP6136878B2 (ja) | Bi基はんだ合金とその製造方法、並びにそれを用いた電子部品のボンディング方法および電子部品実装基板 | |
CN109848606B (zh) | 一种高界面结合强度的Sn-Ag-Cu无铅焊料及其制备方法 | |
JP5699897B2 (ja) | Znを主成分とするPbフリーはんだ合金 | |
JP2017035708A (ja) | Pbを含まないSb−Cu系はんだ合金 | |
JP2016093831A (ja) | Pbを含まないMg−Cu系はんだ合金 | |
JP7007623B1 (ja) | はんだ合金及びはんだ継手 | |
JP5861526B2 (ja) | Pbを含まないGe−Al系はんだ合金 | |
JP2016097444A (ja) | Pbを含まないSb−In系はんだ合金 | |
JP6128062B2 (ja) | Au−Ge−Sn系はんだ合金 | |
JP6136807B2 (ja) | Bi基はんだ合金とその製造方法、並びにそれを用いた電子部品のボンディング方法および電子部品実装基板 | |
CN116984776A (zh) | 一种含Fe、Ho的Sn-Ag-Cu无铅焊料合金及其制备方法 | |
JP2018149554A (ja) | PbフリーBi系はんだ合金、該はんだ合金を用いた電子部品、および電子部品実装基板 | |
JP2017029996A (ja) | Pbを含まないAg−Sb系はんだ合金 | |
KR19990073280A (ko) | 아연의산화가방지되는주석-아연계무연땜납 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20831263 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20217034074 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2020831263 Country of ref document: EP Effective date: 20211011 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112021026430 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112021026430 Country of ref document: BR Kind code of ref document: A2 Effective date: 20211227 |