WO2013099849A1 - Sn-Cu系鉛フリーはんだ合金 - Google Patents
Sn-Cu系鉛フリーはんだ合金 Download PDFInfo
- Publication number
- WO2013099849A1 WO2013099849A1 PCT/JP2012/083438 JP2012083438W WO2013099849A1 WO 2013099849 A1 WO2013099849 A1 WO 2013099849A1 JP 2012083438 W JP2012083438 W JP 2012083438W WO 2013099849 A1 WO2013099849 A1 WO 2013099849A1
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- Prior art keywords
- solder
- mass
- solder alloy
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- alloy
- Prior art date
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Classifications
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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
-
- 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
- B23K35/0233—Sheets, foils
-
- 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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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3736—Metallic materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3463—Solder compositions in relation to features of the printed circuit board or the mounting process
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10371—Shields or metal cases
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
Definitions
- the present invention relates to a lead-free solder alloy, particularly a Sn-Cu based lead-free solder alloy.
- Solder alloy is used, for example, for connecting an electrode of an electronic device to another part, or for joining an IC device to a shield case and further to a heat sink.
- the electrode and the circuit board or the IC device and the shield case are joined metallically by utilizing the wettability with the metal constituting the electrode.
- Cu plating is often used for solder joint surfaces such as electrodes.
- Ni plating may be used. Therefore, soldering is often performed not only on the Cu plating surface but also on the Ni plating surface. Therefore, a solder alloy having excellent solderability is required for both Ni and Cu.
- Ni plating surface is generally difficult to solder
- Au or the like is thinly plated on the Ni plating surface, and soldering is performed thereon.
- Patent Document 1 JP-A-60-166192
- Bi-Ag solder alloys Patent Document 2: Special Publication 2005
- Sn-Zn solder alloys Patent Document 3: JP-A-2005-52869
- solder alloy (see Patent Document 3) containing a very unstable and easily oxidizable component such as Zn tends to be avoided because corrosion or aging occurs in the electrode.
- solder alloy that does not contain Ag and Zn, that is, has low environmental impact and is excellent in economic efficiency, and exhibits excellent solderability for both Cu and Ni.
- prior art solder alloys have not always been satisfactory materials.
- an object of the present invention is to provide a novel solder alloy in which such a problem is solved.
- the present inventors have found that Sn—Cu—Al solder alloy exhibits excellent wettability to the Ni plating surface.
- the solder according to the present invention can be easily soldered to a Ni-plated surface that is not Au-plated, and since no precious metal is contained in the solder, industrially inexpensive soldering is possible. Of course, solderability is further improved by performing Au flash plating on the Ni plating surface.
- the present invention is a lead-free solder alloy having an alloy composition consisting of Cu: 0.6 to 0.9 mass%, Al: 0.01 to 0.1 mass%, and the balance Sn.
- the alloy composition may further contain at least one kind of Ti: 0.02 to 0.1% by mass and Co: 0.01 to 0.05% by mass.
- the solder alloy according to the present invention includes Cu: 0.6 to 0.9% by mass, Al: 0.01 to 0.1% by mass, and optionally, at least one of Ti: 0.02 to 0.1% by mass and Co: 0.01 to 0.05% by mass, It is a lead-free solder alloy having an alloy composition composed of the remaining Sn.
- the present invention is a lead-free solder alloy having an alloy composition composed of Cu: 0.6 to 0.9 mass%, Al: 0.01 to 0.1 mass%, and the balance Sn.
- the present invention is a lead-free solder alloy having an alloy composition consisting of Cu: 0.6 to 0.9 mass%, Al: 0.01 to 0.1 mass%, Ti: 0.02 to 0.1 mass%, and the balance Sn.
- the present invention is a lead-free solder alloy having an alloy composition consisting of Cu: 0.6 to 0.9 mass%, Al: 0.01 to 0.1 mass%, Co: 0.01 to 0.05 mass%, and the balance Sn.
- the present invention is a lead-free solder alloy having an alloy composition consisting of Cu: 0.6 to 0.9 mass%, Al: 0.01 to 0.1 mass%, Ti: 0.02 to 0.1 mass%, Co: 0.01 to 0.05 mass%, and the balance Sn. .
- solder alloys are collectively referred to as solder alloys according to the present invention.
- the present invention is a lead-free solder alloy sheet having a thickness of 500 ⁇ m or less having any of the alloy compositions described above.
- the present invention is an assembly of a shield case and an IC device joined by a solder alloy according to the present invention.
- the present invention is an assembly of a heat sink, a shield case, and an IC device in which a heat sink is further joined to the shield case by the solder alloy.
- FIG. 1 is an explanatory view schematically showing an aspect in which a solder alloy according to the present invention is used for soldering an IC device.
- FIG. 2 schematically shows a state before heating when an assembly of an IC device and a shield case is soldered to the surface plated with Au by flash plating on the Ni plated surface using the solder alloy according to the present invention. It is explanatory drawing.
- FIG. 3 is a schematic explanatory view of the structure of the solder joint when the assembly of FIG. 2 is heated and joined.
- FIG. 4 is a graph showing the relationship between the Al content and the solder wettability in the Sn—Cu solder alloy based on the data in Table 1.
- FIG. 1 is an explanatory view schematically showing a state of soldering between an IC device and a heat radiating member (shield case or heat sink) using the solder alloy according to the present invention.
- the electric and electronic industries are becoming lighter, thinner and smaller with daily technological innovation.
- multi-functionality and high density have been pursued.
- a large current is passed through the semiconductor device, and the amount of heat generated in the semiconductor portion tends to increase.
- the heat dissipating performance for releasing the generated heat to the outside is a very important factor directly linked to the high performance and reliability of the semiconductor.
- metal Cu having a high thermal conductivity metal Cu plated with Ni, metal Al, or the like is used as a metal material.
- an IC device 3 such as BGA or Si provided on the substrate 5 is connected to the heat sink 1 via a shield case 4, the connection between the IC device 3 and the shield case 4, and the shield case 4.
- the solder alloy 2 according to the present invention is used for connection between the heat sink 1 and the heat sink 1.
- the sheet-like solder alloy according to the present invention is interposed between the IC device 3 and the shield case 4 and between the shield case 4 and the heat sink 1 to form an assembly, which is heated in a reflow furnace or the like. And solder.
- FIG. 2 and FIG. 3 show the case where soldering is performed using the solder alloy according to the present invention on a joint surface that has been subjected to Au flash plating in order to prevent oxidation and improve solderability on the Ni plating surface. It is a typical explanatory view of the joined part before heating to the soldering temperature and after heating. The same members are denoted by the same reference numerals. Of course, as shown in the examples described later, if the solder alloy according to the present invention is used, effective soldering can be performed on the Ni plating surface without expensive Au plating.
- FIG. 2 shows the assembly before soldering
- FIG. 3 shows the assembly after soldering.
- the shield case is further soldered to the heat sink, and in that case as well, it is preferable to solder using the solder according to the present invention.
- the Ni plating layer 8 is provided on the IC device 7 and the shield case 6, respectively, and the Au plating layer 10 by Au flash plating is provided thereon to constitute the bonding surface. These joining surfaces are heated and joined via the solder 9 according to the present invention.
- the Au plating layer 10 shown in FIG. 2 diffuses and disappears inside the solder by heating, and a Sn—Cu—Ni intermetallic compound layer 11 is formed as shown in FIG.
- metal In a resin-based material containing metal In, grease or conductive tape is used.
- metal In is a noble metal and is expensive as a joining material, it has difficulty in economic efficiency as well as a material containing Ag.
- Grease and conductive tape still have problems in heat resistance and adhesion to semiconductor elements and members.
- the Ni-plated IC device semiconductor element
- the shield case or the shield case and the heat sink are joined to each other by using the solder alloy according to the present invention.
- the shield case surface and the heat sink surface may also be subjected to Ni plating or Ni / Au flash plating.
- the reason for defining the solder alloy component in the present invention is as follows.
- Cu is blended for improving the strength of the solder alloy and adjusting the melting point.
- the solder used in the semiconductor mounting part is a SnAgCu alloy mainly composed of Sn-3 mass% Ag-0.5 mass% Cu solder due to the recent lead-free process.
- the solder alloy according to the present invention has a melting point of about 227 to 230 ° C. and a melting point close to the eutectic composition of the Sn—Cu alloy.
- the Cu addition amount is 0.6 to 0.9 mass%.
- the strength is not sufficiently improved.
- the Cu content exceeds 0.9% by mass, the melting point is high and the mechanical ductility is poor.
- it is 0.7 to 0.9% by mass.
- One of the features of the present invention is that Al is blended, but if Al: less than 0.01% by mass, the effect of improving wettability is not sufficient. On the other hand, when Al exceeds 0.1% by mass, Al which is easily oxidized at the time of melting tends to be concentrated on the solder surface, and the object of the present invention cannot be achieved with respect to wettability.
- a preferable Al content is 0.02 to 0.07 mass%.
- the addition of 0.02 to 0.1% by mass of Ti further improves the wettability particularly with respect to Ni.
- the total amount of Al and Ti is 0.03 to 0.1 mass%, the wettability improvement effect is remarkable.
- Co 0.01 to 0.05% by mass
- the wettability of the solder alloy according to the present invention to the Ni surface can be further improved, and the strength and hardness as a bonding material can be increased.
- semiconductor elements are often composed mainly of silicon having a low coefficient of thermal expansion
- the heat sink and shield case to be joined are made of a metal material.
- the joint between the semiconductor and the heat radiating member (heat sink or shield case) is subjected to thermal strain or thermal stress due to the difference in thermal expansion coefficient between each other when energized, and the joined body may be cracked or peeled off.
- the solder alloy according to the present invention can improve the mechanical ductility in addition to the above-described effects by adding a small amount of Al to the Sn-Cu solder. Conceivable.
- the addition of a trace amount of Al and, if necessary, a small amount of 0.02 to 0.1% by mass of Ti to the Sn-Cu alloy can refine the microstructure containing Sn as the main component and suppress the crack growth due to internal stress. It is thought that the life of the solder alloy can be extended by stress relaxation.
- the form of the solder alloy according to the present invention is not particularly limited, and can be used in a suitable form such as bar solder, powder solder, ball solder, and sheet solder.
- the solder according to the present invention has a particularly good solderability to the Ni surface, so that it is formed into a sheet shape, and is sandwiched between the shield case and the bottom surface of the IC device, and is used for a transfer type reflow furnace or solder joint. It can be easily joined by heating in an oven furnace.
- the thickness of the solder sheet at this time is 500 ⁇ m or less.
- the lower limit is not particularly specified, but is usually 200 ⁇ m or more due to production limitations.
- the solder sheet according to the present invention is cut into a suitable width and length according to the solder joint surface and used for the above-described soldering.
- solder alloy according to the present invention is also used for soldering circuit board electrodes. Used in the same way. In that case, it can be used as preform solder in the form of pellets or disks.
- a solder having the alloy composition shown in Table 1 was prepared, a wettability test was performed as follows, and the wettability and tensile strength of each solder were measured.
- Wettability test The wettability of the solder alloy was examined by a wetting balance method.
- the test piece used was a Ni plate and a Cu plate (thickness 0.3 ⁇ width 10 ⁇ length 30 mm).
- a thin resin flux for soldering was applied to the surface of the test piece and immersed in a molten solder heated to 260 ° C. to obtain a wetting curve with respect to the time axis. From this wetting curve, the zero crossing time was determined and the wettability was evaluated.
- the test results are summarized in Table 1.
- the zero crossing time which is about 1 second or more faster than that of the Sn-0.7 mass% Cu alloy solder which is the basic composition is good. Since the zero crossing time of the basic composition was 5.4 seconds, when it was 2 seconds or more and less than 4 seconds, it was judged as “good” because improvement in wettability was observed. A zero crossing time of less than 2 seconds was set as “excellent” and 4 seconds or more was set as “poor”.
- the wettability with respect to the Cu plate was evaluated and summarized in Table 1.
- the wettability criteria are “excellent” for 1.1 seconds or less, which indicates faster wetting than Sn-0.7Cu solder, which is the basic composition, “good” for 1.1 to less than 1.6 seconds, 1.6 seconds The above was regarded as “poor”.
- Sn Cu solder alloy contains Ti: 0.02 to 0.1 mass%, so that the wettability to Ni is greatly improved. In particular, when the total addition amount of Al and Ti is about 0.03 to 0.1% by mass, the wettability to Ni is strongly improved.
- FIG. 4 is a graph created based on the data in Table 1, and shows how the solder wettability with respect to the Ni surface and Cu surface changes when the Al content is changed in the Sn-0.7Cu-based solder alloy. Show. Although the solder wettability of the Cu surface is not particularly affected depending on the Al content, it can be seen that the Ni surface exhibits particularly excellent solder wettability in the range of Al: 0.01 to 0.1%.
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Abstract
Description
別の面からは、本発明は、上述のいずれかに記載の合金組成を有する、厚さ500μm以下の鉛フリーはんだ合金シートである。
図1は、本発明にかかるはんだ合金を用いた、ICデバイスと放熱部材(シールドケースやヒートシンク)とのはんだ付けの様子を模式的に示す説明図である。
本発明においてCuは、はんだ合金の強度改善そして融点調整のために配合される。
ウェッティングバランス法により、はんだ合金の濡れ性を調べた。
この試験片表面に、はんだ付け用の樹脂系フラックスを薄く塗布し、260℃に加熱保持された溶融はんだ中に浸漬して、時間軸に対する濡れ曲線を得た。この濡れ曲線から、ゼロクロス時間を求め、濡れ性を評価した。
表1に示す結果から分かるように、Sn-0.6~0.9質量%Cu合金では、Niに対する濡れ性が悪いが、これに0.01~0.1質量%のAlを添加することで、Niに対する濡れ性が改善される。
Claims (7)
- Cu:0.6~0.9質量%、Al:0.01~0.1質量%、残部Snから成る合金組成を有する鉛フリーはんだ合金。
- 前記合金組成が、さらに、Ti:0.02~0.1質量%含有する請求項1記載の鉛フリーはんだ合金。
- 前記合金組成が、さらに、Co:0.01~0.05質量%を含有することを特徴とする、請求項1記載の鉛フリーはんだ合金。
- 前記合金組成が、さらに、Co:0.01~0.05質量%を含有することを特徴とする、請求項2記載の鉛フリーはんだ合金。
- 請求項1ないし4のいずれかに記載の合金組成を有する、厚さ500um以下の鉛フリーはん だ合金シート。
- 請求項1ないし4のいずれかに記載の鉛フリーはんだ合金で接合されたシールドケースとICデバイスとの組立体。
- 前記シールドケースにさらにヒートシンクを請求項1ないし4のいずれかに記載の鉛フリーはんだ合金で接合されたヒートシンクと、シールドケースと、ICデバイスとの組立体。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280064851.1A CN104023902B (zh) | 2011-12-27 | 2012-12-25 | Sn-Cu系无铅焊料合金 |
ES12861511T ES2702240T3 (es) | 2011-12-27 | 2012-12-25 | Aleación de soldadura sin plomo basada en Sn-Cu-Al-Ti |
KR1020147017650A KR101986557B1 (ko) | 2011-12-27 | 2012-12-25 | Sn-Cu계 납프리 땜납 합금 |
EP12861511.9A EP2799181B1 (en) | 2011-12-27 | 2012-12-25 | Sn-Cu-Al-Ti BASED LEAD-FREE SOLDER ALLOY |
US14/369,541 US10137536B2 (en) | 2011-12-27 | 2012-12-25 | Sn-Cu-based lead-free solder alloy |
JP2013551698A JP5614507B2 (ja) | 2011-12-27 | 2012-12-25 | Sn−Cu系鉛フリーはんだ合金 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011286132 | 2011-12-27 | ||
JP2011-286132 | 2011-12-27 |
Publications (1)
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WO2013099849A1 true WO2013099849A1 (ja) | 2013-07-04 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/083438 WO2013099849A1 (ja) | 2011-12-27 | 2012-12-25 | Sn-Cu系鉛フリーはんだ合金 |
Country Status (8)
Country | Link |
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US (1) | US10137536B2 (ja) |
EP (1) | EP2799181B1 (ja) |
JP (1) | JP5614507B2 (ja) |
KR (1) | KR101986557B1 (ja) |
CN (1) | CN104023902B (ja) |
ES (1) | ES2702240T3 (ja) |
TW (1) | TWI492810B (ja) |
WO (1) | WO2013099849A1 (ja) |
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WO2021049643A1 (ja) * | 2019-09-12 | 2021-03-18 | 株式会社日本スペリア社 | 鉛フリーはんだ合金 |
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US10195698B2 (en) | 2015-09-03 | 2019-02-05 | AIM Metals & Alloys Inc. | Lead-free high reliability solder alloys |
US10440877B2 (en) * | 2016-08-18 | 2019-10-15 | Cnh Industrial America Llc | Residue management based on topography by an agricultural tillage implement |
EP3512668B1 (en) * | 2016-09-14 | 2021-07-21 | iRobot Corporation | Systems and methods for configurable operation of a robot based on area classification |
CN106498197B (zh) * | 2016-10-18 | 2018-03-06 | 广西大学 | 一种Sn‑Cu‑Al系无铅焊料的制备方法 |
US10903186B2 (en) * | 2018-10-19 | 2021-01-26 | Toyota Motor Engineering & Manufacturing North America, Inc. | Power electronic assemblies with solder layer and exterior coating, and methods of forming the same |
US11482461B2 (en) * | 2019-12-31 | 2022-10-25 | Taiwan Semiconductor Manufacturing Co., Ltd. | Semiconductor package and method for making the same |
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EP2799181A4 (en) | 2016-01-20 |
EP2799181A1 (en) | 2014-11-05 |
TW201334907A (zh) | 2013-09-01 |
KR20140108240A (ko) | 2014-09-05 |
US20150029670A1 (en) | 2015-01-29 |
CN104023902A (zh) | 2014-09-03 |
EP2799181B1 (en) | 2018-09-26 |
JP5614507B2 (ja) | 2014-10-29 |
KR101986557B1 (ko) | 2019-06-07 |
JPWO2013099849A1 (ja) | 2015-05-07 |
CN104023902B (zh) | 2016-05-04 |
TWI492810B (zh) | 2015-07-21 |
US10137536B2 (en) | 2018-11-27 |
ES2702240T3 (es) | 2019-02-28 |
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