JP2020032448A - Solder alloy, solder paste and electronic component module - Google Patents

Solder alloy, solder paste and electronic component module Download PDF

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JP2020032448A
JP2020032448A JP2018161718A JP2018161718A JP2020032448A JP 2020032448 A JP2020032448 A JP 2020032448A JP 2018161718 A JP2018161718 A JP 2018161718A JP 2018161718 A JP2018161718 A JP 2018161718A JP 2020032448 A JP2020032448 A JP 2020032448A
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mass
solder alloy
solder
electronic component
temperature
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JP6984568B2 (en
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五十嵐 克彦
Katsuhiko Igarashi
克彦 五十嵐
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TDK Corp
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481Disposition
    • H01L2224/48151Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item

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Abstract

To provide a solder alloy or the like, usable under a high temperature environment of 250°C, having a solidus line temperature of 300°C-450°C, having high breaking strength, and having high fixing strength after a heat cycle.SOLUTION: A solder alloy comprises Sb of more than 45 mass% and 75 mass% or less, 15-39 mass% Sn, 0-16 mass% Ag, 0-15 mass% Cu, 0-11 mass% Bi, 0-6 mass% In, and inevitable impurities, and the total of Sb and Sn occupies 80 mass% or more.SELECTED DRAWING: None

Description

本発明は、はんだ合金、はんだペースト、及び、電子部品モジュールに関する。   The present invention relates to a solder alloy, a solder paste, and an electronic component module.

SiC半導体モジュールの進展にともない電子部品が置かれる雰囲気の温度が250℃程度の高温になる。そのような環境下では、作動温度は部品の接合材である従来のSn系はんだ合金の固相線温度以上となり、接合部が再溶融し、部品が欠落することがある。したがって、再溶融しない接合部をもつ耐熱信頼性の高い電子部品が求められている。   As the SiC semiconductor module progresses, the temperature of the atmosphere in which the electronic components are placed becomes high as about 250 ° C. In such an environment, the operating temperature becomes equal to or higher than the solidus temperature of the conventional Sn-based solder alloy, which is the joining material for the components, and the joint may be re-melted and the components may be missing. Therefore, there is a demand for an electronic component having a high heat-resistant reliability having a joint that does not melt again.

このような高温環境で使用される電子部品を配線等と接合するのに適し、使用可能なはんだ合金が特許文献1〜3に開示されている。   Patent Documents 1 to 3 disclose solder alloys that are suitable for joining electronic components used in such a high-temperature environment to wirings and the like and that can be used.

特許文献1はNiやCuに対する濡れ性に優れ、接合温度≦400℃、温度サイクル寿命と高温信頼性に優れる高温はんだ合金を開示している。特許文献2、3は溶融開始温度が280℃以上であり、はんだ継手を形成できるSn−Sb−Ag−Cu系高温鉛フリーはんだ合金を開示している。   Patent Literature 1 discloses a high-temperature solder alloy having excellent wettability to Ni and Cu, a joining temperature of 400 ° C., and excellent temperature cycle life and high-temperature reliability. Patent Documents 2 and 3 disclose Sn—Sb—Ag—Cu-based high-temperature lead-free solder alloys having a melting start temperature of 280 ° C. or higher and capable of forming a solder joint.

特開2007−152385号公報JP 2007-152385 A WO2014/024715号公報WO2014 / 024715 WO2014/024271号公報WO2014 / 024271

しかしながら、250℃の高温環境において、前記の先行技術は、Sn含有量が多く、あるいはSb含有量が不足になっており、他部品との接合において、Sn系の反応生成物が多くなり、はんだ合金としての破断強度が不足しており、部品を接合した際の固着強度の低下や接合部の再溶融を招来し、熱サイクル経過後に高い固着強度、すなわち耐熱信頼性を維持することが困難であった。
なお、クリープ現象を抑えるため、具体的には、300℃以上の固相線温度が必要であり、実装の都合上、他の部品の耐熱性から、固相線温度が450℃以下、好ましくは400℃以下であって、450℃以下、好ましくは400℃以下で接合されうる接合材料、特に、はんだ合金が求められる。
However, in a high-temperature environment of 250 ° C., the above-mentioned prior art has a large Sn content or an insufficient Sb content. Insufficient breaking strength as an alloy, which leads to a decrease in bonding strength when joining parts and re-melting of the joint, and it is difficult to maintain high bonding strength after heat cycles, that is, to maintain heat resistance reliability. there were.
In order to suppress the creep phenomenon, specifically, a solidus temperature of 300 ° C. or more is required. For the sake of mounting, the solidus temperature is 450 ° C. or less, preferably, from the heat resistance of other components. A bonding material that can be bonded at a temperature of 400 ° C. or less, 450 ° C. or less, preferably 400 ° C. or less, particularly a solder alloy, is required.

本発明は上記課題に鑑みてなされたものであり、250℃の高温環境での使用が可能で有り、300℃〜450℃の固相線温度を有し、破断強度が高く、かつ、熱サイクル経過後の固着強度、すなわち耐熱信頼性が高い、はんだ合金等を提供することを目的とする。   The present invention has been made in view of the above problems, can be used in a high-temperature environment of 250 ° C., has a solidus temperature of 300 ° C. to 450 ° C., has a high breaking strength, and has a heat cycle. An object of the present invention is to provide a solder alloy or the like having a high fixing strength after the passage, that is, high heat resistance reliability.

本発明に係るはんだ合金、はんだペーストおよび電子部品モジュールは、次の通りである。
(1)45質量%超かつ75質量%以下のSb、
15〜39質量%のSn、
0〜16質量%のAg、
0〜15質量%のCu、
0〜11質量%のBi、
0〜6質量%のIn、及び、不可避不純物からなり、
Sb及びSnの合計が80質量%以上を占める、はんだ合金。
(2)3〜15質量%のAg、及び、3〜10質量%のCuを含む、上記(1)記載の、はんだ合金。
(3)1〜10質量%のBiを含む、上記(2)記載のはんだ合金。
(4)1〜5質量%のInを含む、上記(2)または(3)記載の、はんだ合金。
(5)はんだ合金の粉末と、樹脂と、溶剤と、を含み、前記はんだ合金は、上記(1)〜(4)記載のはんだ合金である、はんだペースト。
(6)端子を有する電子部品と、配線部材と、前記端子と前記配線部材とを接合する接合部と、を備え、前記接合部は、上記(1)〜(4)のはんだ合金を含む、電子部品モジュール。
The solder alloy, solder paste and electronic component module according to the present invention are as follows.
(1) Sb of more than 45% by mass and 75% by mass or less;
15 to 39% by mass of Sn,
0-16 mass% Ag,
0 to 15% by mass of Cu,
0-11 mass% Bi,
0 to 6% by mass of In and unavoidable impurities,
A solder alloy in which the sum of Sb and Sn accounts for 80% by mass or more.
(2) The solder alloy according to the above (1), comprising 3 to 15% by mass of Ag and 3 to 10% by mass of Cu.
(3) The solder alloy according to the above (2), containing 1 to 10% by mass of Bi.
(4) The solder alloy according to the above (2) or (3), containing 1 to 5% by mass of In.
(5) A solder paste, comprising: a solder alloy powder, a resin, and a solvent, wherein the solder alloy is the solder alloy according to any one of (1) to (4).
(6) An electronic component having a terminal, a wiring member, and a joining portion that joins the terminal and the wiring member, wherein the joining portion includes the solder alloy of (1) to (4) above. Electronic component module.

本発明によれば、300℃〜450℃の固相線温度を有し、250℃の高温環境での使用が可能で有り、破断強度が高い、かつ、他部品との接合において、Sn系の反応生成物の生成を抑制することができ、熱サイクル経過後の固着強度、すなわち耐熱信頼性が高い、はんだ合金等が提供される。   According to the present invention, it has a solidus temperature of 300 ° C. to 450 ° C., can be used in a high temperature environment of 250 ° C., has a high breaking strength, and has an Sn-based It is possible to provide a solder alloy or the like that can suppress generation of a reaction product and has high fixing strength after a heat cycle, that is, high heat resistance reliability.

図1は、本発明の実施形態にかかる電子部品モジュールの概略断面図である。FIG. 1 is a schematic sectional view of an electronic component module according to an embodiment of the present invention.

以下の実施形態中で述べる温度、冷却速度等はこの発明の範囲内の好適例に過ぎない。従って、本発明は以下の実施形態のみに限定されるものではない。   The temperatures, cooling rates, and the like described in the following embodiments are merely preferred examples within the scope of the present invention. Therefore, the present invention is not limited only to the following embodiments.

(はんだ合金)
本発明の実施形態にかかるはんだ合金は、45質量%超かつ75質量%以下のSb、15質量%以上39質量%以下のSn、0〜16質量%のAg、0〜15質量%のCu、0〜11質量%のBi、0〜6質量%のIn、及び、不可避不純物からなり、Sb及びSnの合計が80質量%以上を占める。
(Solder alloy)
The solder alloy according to the embodiment of the present invention contains more than 45% by mass and 75% by mass or less of Sb, 15% by mass or more and 39% by mass or less of Sn, 0 to 16% by mass of Ag, 0 to 15% by mass of Cu, It consists of 0 to 11% by mass of Bi, 0 to 6% by mass of In, and unavoidable impurities, and the total of Sb and Sn accounts for 80% by mass or more.

このような組成のはんだ合金では300℃〜450℃以上、好ましくは300℃〜400℃の固相線温度をもつことが可能である。したがって、例えば、このようなはんだ合金を含む接合部を持つ電子部品モジュールを、200℃〜250℃程度の高温環境で動作させること可能となる。また、このような組成のはんだ合金を含む接合部は、破断強度が高く、また、熱サイクル経過後の固着強度が高く維持される。   A solder alloy having such a composition can have a solidus temperature of 300C to 450C or more, preferably 300C to 400C. Therefore, for example, an electronic component module having a joint including such a solder alloy can be operated in a high temperature environment of about 200 ° C. to 250 ° C. In addition, the joint including the solder alloy having such a composition has a high breaking strength and a high fixing strength after a heat cycle.

特に、従来よりもSbの含有量を増やし、Snの含有量を減らすことにより、固相線温度が300℃〜450℃に上がると共に、配線部材及び/又は電子部品の端子との接合部におけるSn反応物の生成が抑制されて熱サイクル経過後の固着強度、すなわち耐熱信頼性が高く維持されることが考えられる。   In particular, by increasing the content of Sb and decreasing the content of Sn as compared with the prior art, the solidus temperature increases to 300 ° C. to 450 ° C., and the Sn at the junction with the wiring member and / or the terminal of the electronic component is increased. It is conceivable that the formation of reactants is suppressed, and the fixing strength after the heat cycle has elapsed, that is, the heat resistance reliability is kept high.

本実施形態にかかるはんだ合金は、Sb、Sn及び不可避不純物の合計が100質量%である、すなわち、Sb、Sn、及び、不可避不純物のみからなることができる。   The total amount of Sb, Sn and unavoidable impurities is 100% by mass, that is, the solder alloy according to the present embodiment can be composed of only Sb, Sn and unavoidable impurities.

本実施形態にかかるはんだ合金における不可避不純物の例は、Ca、Fe、Si、Cd、Co、Pb、Zn、Al、As、Niである。不可避不純物の量は、それぞれ、0.1質量%以下であることができる。   Examples of inevitable impurities in the solder alloy according to the present embodiment are Ca, Fe, Si, Cd, Co, Pb, Zn, Al, As, and Ni. The amount of each inevitable impurity can be 0.1% by mass or less.

はんだ合金におけるSb及びSn及び不可避不純物の合計が100質量%未満である場合、はんだ合金における残余の構成元素は、Ag、Cu、Bi、Inからなる群から選択される少なくとも一つ又は任意の組み合わせである。ただし、Sb及びSnの合計が80質量%以上を占める。   When the total of Sb and Sn and inevitable impurities in the solder alloy is less than 100% by mass, the remaining constituent elements in the solder alloy are at least one selected from the group consisting of Ag, Cu, Bi, and In, or any combination thereof. It is. However, the sum of Sb and Sn accounts for 80% by mass or more.

はんだ合金は、3〜15質量%のAg及び3〜10質量%のCuを両方含むことが好ましい。   The solder alloy preferably contains both 3 to 15% by weight of Ag and 3 to 10% by weight of Cu.

前記の量のAg、Cuを同時に添加すると、本発明によるはんだ合金の固相線温度をさらに正確に調整することができ、得られるはんだ合金の固相線温度を300℃〜400℃に担保することができる。Ag、Cuの含有量が前記の量を外れる場合は、AgとSnとの金属間化合物(AgSn)または、CuとSnとの金属間化合物(CuSn)など融点が400℃以上の化合物が生成するため、300℃〜400℃の範囲内の固相線温度を有するはんだ合金が得られることを担保できない。また、所定量のAg、Cuの添加により、強度が比較的に低いSbとSnとの2元系金属間化合物がなくなるため、得られるはんだ合金は、金属材料としての破断強度も、接合部材としての固着強度および熱サイクル後の固着強度も高まる。 When the above amounts of Ag and Cu are simultaneously added, the solidus temperature of the solder alloy according to the present invention can be adjusted more accurately, and the solidus temperature of the obtained solder alloy is maintained at 300 ° C to 400 ° C. be able to. When the content of Ag or Cu is out of the above range, the melting point of the intermetallic compound of Ag and Sn (Ag 3 Sn) or the intermetallic compound of Cu and Sn (Cu 3 Sn) is 400 ° C. or more. Since a compound is generated, it cannot be ensured that a solder alloy having a solidus temperature in the range of 300 ° C to 400 ° C is obtained. In addition, the addition of the predetermined amounts of Ag and Cu eliminates the binary intermetallic compound of Sb and Sn, which have relatively low strength. Therefore, the resulting solder alloy has a breaking strength as a metal material and a joining member. And the bonding strength after thermal cycling are also increased.

はんだ合金が、Ag及びCuを含んでいる場合、はんだ合金はさらに1〜10質量%のBiを含むことが好ましい。Biを前記の範囲内に含むことにより、Sn−Sb−Ag−Cu−Bi合金が形成され、この合金は、Sn−Sb−Ag−Cu合金に比べて、破断強度、固着強度および熱サイクル後の固着強度がともに高くなる。なお、はんだ合金は、Biを10質量%超に含む場合、Sn−Biのはんだ合金が生成するため、得られるはんだ合金の固相線温度が低下し、熱サイクル後の固着強度が低下してしまう。   When the solder alloy contains Ag and Cu, the solder alloy preferably further contains 1 to 10% by mass of Bi. By including Bi in the above range, a Sn-Sb-Ag-Cu-Bi alloy is formed, and this alloy has a higher breaking strength, a higher bonding strength, and a lower heat cycle than the Sn-Sb-Ag-Cu alloy. Both have high fixing strength. In addition, when the solder alloy contains more than 10% by mass of Bi, a Sn-Bi solder alloy is generated, so that the solidus temperature of the obtained solder alloy decreases, and the fixing strength after the heat cycle decreases. I will.

また、はんだ合金が、Ag及びCuを含んでいる場合、又は、Ag,Cu,及びBiを含んでいる場合、はんだ合金はさらに1〜5質量%のInを含むことが好ましい。Inを前記の範囲に含むことにより、Sn−Sb−Ag−Cu−InまたはSn−Sb−Ag−Cu−In−Biが生成する。これらの合金はSn−Sb−Ag−Cu合金に比べて強度が高く、得られるはんだ合金は、金属材料としての破断強度も、接合部材としての固着強度および熱サイクル後の固着強度、すなわち耐熱信頼性も上がる。なお、Inの含有量が多すぎると、得られるはんだ合金の固相線温度が低下する傾向がある。   When the solder alloy contains Ag and Cu, or when Ag, Cu, and Bi are contained, the solder alloy preferably further contains 1 to 5% by mass of In. By including In in the above range, Sn-Sb-Ag-Cu-In or Sn-Sb-Ag-Cu-In-Bi is generated. These alloys have a higher strength than the Sn-Sb-Ag-Cu alloy, and the resulting solder alloy has a breaking strength as a metal material, a bonding strength as a joining member and a bonding strength after a heat cycle, that is, heat resistance reliability. Sex rises. If the content of In is too large, the solidus temperature of the obtained solder alloy tends to decrease.

このようなはんだ合金を用いて、電子部品と配線部材とを接合する場合には、プリフォーム材、又は、はんだペーストをあらかじめ形成することができる。プリフォーム材をあらかじめ形成することが好ましい。   When joining an electronic component and a wiring member using such a solder alloy, a preform material or a solder paste can be formed in advance. It is preferable to form a preform material in advance.

次に、本実施形態にかかるはんだ合金の製造方法の一例について説明する。まず、Sn、Sb、Cu、Ag、Bi及びIn各々を、例えばターボミル、ローラミル、遠心力粉砕機等の公知の粉砕機を用いて粉砕し、各金属材料の粉末を得る。   Next, an example of the method for manufacturing a solder alloy according to the present embodiment will be described. First, each of Sn, Sb, Cu, Ag, Bi, and In is pulverized using a known pulverizer such as a turbo mill, a roller mill, or a centrifugal pulverizer to obtain a powder of each metal material.

上記のように製造した各金属材料の粉末を、それらを混合する。その後、アルミナるつぼ中に入れ、前記各金属材料の粉末の入ったるつぼを溶解炉に入れ、金属材料の粉末を加熱溶融させる。加熱の温度は特に限定されないが、本実施形態において、前記各金属材料の中で、最も高い融点を持つ金属よりも高い温度に加熱、溶融する。溶融した金属材料を冷却し、はんだ合金を得る。冷却速度は、0.8〜50℃/秒であることができる。   The powder of each metal material produced as described above is mixed. Thereafter, the powder is placed in an alumina crucible, and the crucible containing the powder of each metal material is placed in a melting furnace, and the powder of the metal material is heated and melted. Although the heating temperature is not particularly limited, in the present embodiment, the material is heated and melted to a higher temperature than the metal having the highest melting point among the respective metal materials. The molten metal material is cooled to obtain a solder alloy. The cooling rate can be between 0.8 and 50C / sec.

本実施形態に係るはんだ合金は、プリフォーム材やはんだペーストとして好適に用いることができる。プリフォーム材の形状としては、はんだ箔、ワッシャ、リング、ペレット、ディスク、リボン、ワイヤー等が挙げられる。   The solder alloy according to the present embodiment can be suitably used as a preform material or a solder paste. Examples of the shape of the preform material include a solder foil, a washer, a ring, a pellet, a disk, a ribbon, and a wire.

(はんだ箔)
続いて、プリフォーム材の一例として後述の本発明の実施形態にかかる電子部品モジュールに用いられるはんだ箔を説明する。本実施形態にかかるはんだ箔は、上記のはんだ合金の薄い板である。はんだ箔の厚みは、例えば、100〜1000μmとすることができる。はんだ箔の平面形状は、接合対象となる電子部品及び配線部材の大きさに合わせて適宜設定できる。はんだ箔は、はんだ合金の圧延等により製造することができる。
(Solder foil)
Next, a solder foil used in an electronic component module according to an embodiment of the present invention described below will be described as an example of a preform material. The solder foil according to the present embodiment is a thin plate of the above-mentioned solder alloy. The thickness of the solder foil can be, for example, 100 to 1000 μm. The planar shape of the solder foil can be appropriately set according to the size of the electronic component and the wiring member to be joined. The solder foil can be manufactured by rolling a solder alloy or the like.

(はんだペースト)
続いて、本発明の実施形態にかかるはんだペーストを説明する。本実施形態にかかるはんだペーストは、上記のはんだ合金の粉末と、樹脂と、溶剤と、を含む。樹脂及び溶剤は、いわゆるフラックスと呼ばれる。
(Solder paste)
Subsequently, the solder paste according to the embodiment of the present invention will be described. The solder paste according to the present embodiment includes the above-described solder alloy powder, a resin, and a solvent. The resin and the solvent are called a flux.

はんだ合金の粉末の粒径は10〜50μmとすることができる。この粒径は、レーザー回折法における体積基準の粒度分布のD50である。   The particle size of the solder alloy powder can be 10 to 50 μm. This particle size is D50 of the volume-based particle size distribution in laser diffraction.

樹脂の例は、ロジン、及び、ロジン誘導体(例えば、重合ロジン、水素添加ロジン、フェノール変性ロジン、マレイン化ロジン、アクリル化ロジンである。樹脂の他の例は、アクリル樹脂、ポリエステル樹脂などの合成樹脂である。   Examples of the resin are rosin and rosin derivatives (for example, polymerized rosin, hydrogenated rosin, phenol-modified rosin, maleated rosin, and acrylated rosin. Other examples of the resin include synthesis of acrylic resin, polyester resin, and the like. Resin.

溶剤の例は、グリコール、グリコールエステル、グリコールエーテル(カルビトール、セロソルブなど)である。   Examples of solvents are glycols, glycol esters, glycol ethers (carbitol, cellosolve, etc.).

はんだペーストにおける各成分の比率は、ペースト塗布方法に応じて適宜設定できる。   The ratio of each component in the solder paste can be appropriately set according to the paste application method.

はんだ合金の粉末は、溶融状態のはんだ合金を遠心噴霧アトマイスすること、及び、はんだ合金を粉砕することにより製造できる。遠心噴霧アトマイス法は、高速で回転する回転盤上に、溶融金属を連続供給し、回転盤の遠心力により溶融金属を周囲に噴霧させるものである。この噴霧された溶融金属を所定の雰囲気中で冷却して固化することにより、はんだ合金粉末が得られる。はんだ合金の粉末に、フラックスすなわち、樹脂及び溶剤を混合することにより、はんだペーストを得ることができる。   The solder alloy powder can be produced by centrifugal spray atomizing a molten solder alloy and pulverizing the solder alloy. In the centrifugal spray atomizing method, a molten metal is continuously supplied onto a rotating disk rotating at a high speed, and the molten metal is sprayed around by a centrifugal force of the rotating disk. By cooling and solidifying the sprayed molten metal in a predetermined atmosphere, a solder alloy powder is obtained. A solder paste can be obtained by mixing a flux, that is, a resin and a solvent, with the solder alloy powder.

(電子部品と配線部材との接合)
リフローで電子部品と配線部材とを接合する方法は、電子部品と配線部材との接合部にはんだペーストを塗布し乾燥させる、または、当該接合部にはんだ箔を配置する工程、及び、はんだ箔又ははんだペーストを高温に曝す工程と、を備える。接合温度としては、400〜450℃が好適である。
(Joint between electronic components and wiring members)
A method of joining an electronic component and a wiring member by reflow is to apply and dry a solder paste on a joint between the electronic component and the wiring member, or to arrange a solder foil on the joint, and Exposing the solder paste to a high temperature. The joining temperature is preferably from 400 to 450 ° C.

(電子部品モジュール)
本発明の実施形態にかかる電子部品モジュールは、端子を有する電子部品と、配線部材と、端子と配線部材とを接合する接合部と、を備える。接合部は、上述のはんだ合金を含む。
(Electronic component module)
An electronic component module according to an embodiment of the present invention includes an electronic component having a terminal, a wiring member, and a joint that joins the terminal and the wiring member. The joint includes the above-mentioned solder alloy.

電子部品の例は、トランジスタ、IC、ダイオード等の能動部品、コンデンサ、コイル、抵抗器等の受動部品である。能動部品においては、特に高温環境に曝されることの多いSiC半導体を含む部品が好適である。
電子部品は少なくとも1つ、通常は2以上の端子を有する。端子の材料の例はAg、Cu等の金属で有り、Ni/Auなどのメッキが表面になされていることができる。高温環境に好適で使用する観点から、端子の材料は耐酸化性の強いAu,Pdなどを含むことが好ましい。
Examples of electronic components are active components such as transistors, ICs, and diodes, and passive components such as capacitors, coils, and resistors. As the active component, a component including a SiC semiconductor that is often exposed to a high-temperature environment is particularly preferable.
The electronic component has at least one, usually two or more terminals. An example of the material of the terminal is a metal such as Ag or Cu, and the surface can be plated with Ni / Au or the like. From the viewpoint of being suitable for use in a high-temperature environment, it is preferable that the material of the terminal contains Au, Pd, or the like having high oxidation resistance.

配線部材の例は、配線パッドである。通常、配線パッドは、電気絶縁性の基板上に設けられる。配線パッドの端子の材料の例はCu等の金属で有り、Ni/Auなどのメッキが表面になされていることができる。   An example of the wiring member is a wiring pad. Usually, the wiring pads are provided on an electrically insulating substrate. An example of the material of the terminal of the wiring pad is a metal such as Cu, and the surface can be plated with Ni / Au or the like.

図1に、本発明の1実施形態にかかる電子部品モジュール100を示す。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。この電子部品モジュール100は、下部基板10、リードフレーム30、上部基板40、配線パッド(配線部材)50a,50b、積層セラミックコンデンサ60、接合部70、及びボンディングワイヤ80を主として備える。   FIG. 1 shows an electronic component module 100 according to one embodiment of the present invention. However, the following embodiments are merely examples. The present invention is not at all limited to the following embodiments. The electronic component module 100 mainly includes a lower substrate 10, a lead frame 30, an upper substrate 40, wiring pads (wiring members) 50a and 50b, a multilayer ceramic capacitor 60, a bonding portion 70, and bonding wires 80.

下部基板10は、例えば、AlN基板とすることができる。リードフレーム30は、下部基板10の表面に固定されており、ダイパッド部30a、端子30b、及び、端子30cを備える。半導体チップ20は、ダイパッド部30a上に固定されている。半導体チップ20に設けられたパッド20a、20baが、それぞれ、ボンディングワイヤ80により、端子30b、及び、端子30cと接続されている。ボンディングワイヤ80は、例えば、Alワイヤとすることができる。   The lower substrate 10 can be, for example, an AlN substrate. The lead frame 30 is fixed to the surface of the lower substrate 10, and includes a die pad portion 30a, terminals 30b, and terminals 30c. The semiconductor chip 20 is fixed on the die pad portion 30a. The pads 20a and 20ba provided on the semiconductor chip 20 are connected to the terminals 30b and 30c by bonding wires 80, respectively. The bonding wire 80 can be, for example, an Al wire.

端子30b、30cは、途中から折り曲げられて上方に向かって伸び、その先端には、上部基板40が固定されている。上部基板40上には、一対の配線パッド50a,50bが設けられており、これらの配線パッド50a,50bはそれぞれ、図示しない配線部材により、端子30b、30cと接続されている。   The terminals 30b and 30c are bent from the middle and extend upward, and the upper substrate 40 is fixed to the ends. A pair of wiring pads 50a and 50b are provided on the upper substrate 40, and these wiring pads 50a and 50b are connected to the terminals 30b and 30c by wiring members (not shown), respectively.

積層セラミックコンデンサ60は、コンデンサチップ63、及び、外部電極(端子)64を有する。コンデンサチップ63は、厚み方向に離間して配置された多数の内部電極62と、内部電極62間を絶縁するセラミック層61を有する。   The multilayer ceramic capacitor 60 has a capacitor chip 63 and an external electrode (terminal) 64. The capacitor chip 63 has a large number of internal electrodes 62 spaced apart in the thickness direction, and a ceramic layer 61 for insulating between the internal electrodes 62.

内部電極62の材料は、Ni,Cu,Pd等の金属材料であることができる。セラミック層61の材料は、チタン酸バリウム等のセラミックであることができる。   The material of the internal electrode 62 can be a metal material such as Ni, Cu, and Pd. The material of the ceramic layer 61 can be a ceramic such as barium titanate.

外部電極64は、コンデンサチップ63の両端にそれぞれ配置され、一部の内部電極62は一方側の外部電極64に電気的に接続され、残りの内部電極62は他方側の外部電極64に電気的に接続されている。コンデンサチップ63内において、一方側の外部電極64に接続された内部電極62と、他方側の外部電極64に接続された内部電極62とが積層方向に交互に配置されている。一方の外部電極64は配線パッド50aの上に、他方の外部電極64は配線パッド50bの上に配置されている。   The external electrodes 64 are arranged at both ends of the capacitor chip 63, respectively, and some of the internal electrodes 62 are electrically connected to one external electrode 64, and the remaining internal electrodes 62 are electrically connected to the other external electrode 64. It is connected to the. In the capacitor chip 63, the internal electrodes 62 connected to the external electrodes 64 on one side and the internal electrodes 62 connected to the external electrodes 64 on the other side are alternately arranged in the stacking direction. One external electrode 64 is arranged on the wiring pad 50a, and the other external electrode 64 is arranged on the wiring pad 50b.

接合部70は、フィレット形状を有し、配線パッド50a又は50bと、外部電極64の表面とにそれぞれ接合している。接合部70は、上述のはんだ合金から形成される。   The joint 70 has a fillet shape, and is joined to the wiring pad 50a or 50b and the surface of the external electrode 64, respectively. The joint 70 is formed from the above-mentioned solder alloy.

(実施例1〜31及び比較例1〜11)
Sb粉末、Sn粉末、Ag粉末、Cu粉末、Bi粉末、及び、In粉末を用意した。次に、所定の量の粉末を混合してアルミナるつぼ中に入れ、るつぼを溶解炉に入れ、1200℃の温度に加熱溶融させた後(実施例5、6、8、9および比較例1,7,9,10は700℃)、溶融した金属材料を30℃/秒の冷却速度で冷却し、表1および表2に記載の各試料の組成を有するはんだ合金を得た。
(Examples 1 to 31 and Comparative Examples 1 to 11)
Sb powder, Sn powder, Ag powder, Cu powder, Bi powder, and In powder were prepared. Next, a predetermined amount of powder was mixed and put into an alumina crucible, and the crucible was put into a melting furnace and heated and melted at a temperature of 1200 ° C. (Examples 5, 6, 8, 9 and Comparative Examples 1 and 2). The molten metal material was cooled at a cooling rate of 30 ° C./sec to obtain a solder alloy having the composition of each sample shown in Tables 1 and 2.

(組成)
得られたはんだ合金の組成の測定は、蛍光X線分析装置EA1000VX(日立ハイテクサイエンス製)を用いて分析を行った。測定の結果を表1および表2に示している。
(composition)
The measurement of the composition of the obtained solder alloy was performed using a fluorescent X-ray analyzer EA1000VX (manufactured by Hitachi High-Tech Science). Tables 1 and 2 show the measurement results.

(固相線温度の測定)
得られたはんだ合金の固相線温度を示差走査熱量計(DSC7000:日立ハイテクサイエンス製)により測定した。
(Measurement of solidus temperature)
The solidus temperature of the obtained solder alloy was measured by a differential scanning calorimeter (DSC7000: manufactured by Hitachi High-Tech Science).

(破断強度の測定)
はんだ合金から直方体形状(3mm×2mm×1mm)の試験片を得た。試験片を、軸方向に2mm離れた2つの支持棒で下から支え、試験片の軸方向中央に上から荷重をかける、いわゆる、3点曲げ荷重試験を行った。試験片が破壊に至るまでの最大荷重を基に算出した曲げ応力の値を破断強度として求めた。測定は室温で行った。
(Measurement of breaking strength)
A rectangular parallelepiped (3 mm × 2 mm × 1 mm) test piece was obtained from the solder alloy. A so-called three-point bending load test was performed in which the test piece was supported from below by two support rods separated by 2 mm in the axial direction, and a load was applied from above to the axial center of the test piece. The value of the bending stress calculated based on the maximum load until the test piece was broken was determined as the breaking strength. The measurement was performed at room temperature.

(はんだ合金を用いた接合)
はんだ合金から、6×6×1mmの形状を有するはんだ箔を得た。Ni/Auめっき層を施した配線用Cuパッドを有するアルミナ基板と、Ni/Auめっき膜を施した外部電極(端子)を有するC5750形状のチップコンデンサとを用意した。はんだ箔をアルミナ基板のCuパッド上に載せ、さらにチップコンデンサの外部電極をはんだ箔の上に載せ、450℃及び5分の条件ではんだ箔を溶融させることによりCuパッドとチップコンデンサの外部電極との接合を行い、電子部品モジュールを得た。
(Joint using solder alloy)
A solder foil having a shape of 6 × 6 × 1 mm was obtained from the solder alloy. An alumina substrate having a Cu pad for wiring provided with a Ni / Au plating layer and a C5750-shaped chip capacitor having external electrodes (terminals) provided with a Ni / Au plating film were prepared. The solder foil is placed on the Cu pad of the alumina substrate, and the external electrodes of the chip capacitor are further placed on the solder foil. The solder foil is melted at 450 ° C. for 5 minutes to form the Cu pad and the external electrodes of the chip capacitor. Were joined to obtain an electronic component module.

(接合部の初期固着強度)
アルミナ基板に対して、チップコンデンサの側面中央を加圧棒で10mm/minの速度でアルミナ基板の表面に平行な方向に押圧し、破断時の押圧力(N)を初期の固着強度とした。実際の使用を考慮すると、固着強度は10N以上が必要である。
(Initial bond strength of joint)
The center of the side surface of the chip capacitor was pressed against the alumina substrate in a direction parallel to the surface of the alumina substrate at a speed of 10 mm / min with a pressing rod at a speed of 10 mm / min. In consideration of actual use, the fixing strength needs to be 10 N or more.

(熱サイクル負荷の付与)
電子部品モジュールに対して熱サイクル負荷を与えた。この熱サイクル負荷は、−55℃から200℃までの温度上昇(概ねリニアで所要15分)及び200℃から−55℃までの温度降下(概ねリニアで所要10分)からなるサイクルを3000回繰り返すことである。
(Application of heat cycle load)
A thermal cycle load was applied to the electronic component module. This thermal cycle load repeats a cycle consisting of a temperature rise from -55 ° C. to 200 ° C. (approximately 15 minutes required in a linear manner) and a temperature decrease from 200 ° C. to −55 ° C. (10 minutes required in a substantially linear manner) 3000 times. That is.

(接合部の熱サイクル負荷後の固着強度)
熱サイクル負荷を与えた後、上述と同様の固着強度試験を行った。実際の使用を考慮すると、10N以上が必要であることとした。
(Adhesion strength of joint after thermal cycle load)
After applying the heat cycle load, the same fixing strength test as described above was performed. Considering actual use, 10N or more is required.

Figure 2020032448
Figure 2020032448

Figure 2020032448

合金組成が本発明の範囲内にある実施例1〜31のはんだ合金では、いずれも固相線温度が300℃以上、かつ、450℃以下を示した。また、固着強度の評価につき初期強度と、熱サイクル後強度は、10N以上であることを示した。また、破断強度は34MPa以上であった。
Figure 2020032448

The solder alloys of Examples 1 to 31 whose alloy compositions were within the scope of the present invention all showed a solidus temperature of 300 ° C or higher and 450 ° C or lower. The evaluation of the fixing strength showed that the initial strength and the strength after the heat cycle were 10 N or more. Further, the breaking strength was 34 MPa or more.

また、3〜15質量%のAg、及び、3〜10質量%のCuを含む実施例10,11,13〜31では、固相線温度が300〜400℃となった。   In Examples 10, 11, 13 to 31 containing 3 to 15% by mass of Ag and 3 to 10% by mass of Cu, the solidus temperature was 300 to 400 ° C.

また、上記のAg及びCuに加え、Biを1〜10質量%含む実施例20〜26,及び実施例30では、破断強度が120MPa以上となり、初期の固着強度が100N以上となり、熱サイクル後の固着強度が30N以上となった。   Further, in Examples 20 to 26 and Example 30 containing 1 to 10% by mass of Bi in addition to the above Ag and Cu, the breaking strength was 120 MPa or more, the initial fixing strength was 100 N or more, and The fixing strength was 30 N or more.

また、上記のAg及びCuに加え、Inを1〜5質量%含む実施例28〜30では、破断強度が160MPa以上となり、初期の固着強度が140N以上となり、熱サイクル後の固着強度が50N以上となった。   Further, in Examples 28 to 30 containing 1 to 5% by mass of In in addition to the above Ag and Cu, the breaking strength was 160 MPa or more, the initial bonding strength was 140 N or more, and the bonding strength after thermal cycling was 50 N or more. It became.

なお、本発明の範囲内でない比較例1、2、4〜6,8では、固相線温度がいずれも300℃未満となり、比較例3、7、9〜11では、熱サイクル後強度は、10N未満となった。   In Comparative Examples 1, 2, 4 to 6, and 8, which are not within the scope of the present invention, the solidus temperatures were all lower than 300 ° C., and in Comparative Examples 3, 7, 9 to 11, the strength after heat cycle was: It was less than 10N.

60…積層セラミックコンデンサ(電子部品)、50a,50b…配線パッド(配線部材)、64…外部電極(端子)、70…接合部、100…電子部品モジュール。   Reference numeral 60: multilayer ceramic capacitor (electronic component), 50a, 50b: wiring pad (wiring member), 64: external electrode (terminal), 70: joint, 100: electronic component module.

Claims (6)

45質量%超かつ75質量%以下のSb、
15〜39質量%のSn、
0〜16質量%のAg、
0〜15質量%のCu、
0〜11質量%のBi、
0〜6質量%のIn、及び、不可避不純物からなり、
Sb及びSnの合計が80質量%以上を占める、はんだ合金。
Sb of more than 45% by mass and 75% by mass or less,
15 to 39% by mass of Sn,
0-16 mass% Ag,
0 to 15% by mass of Cu,
0-11 mass% Bi,
0 to 6% by mass of In and unavoidable impurities,
A solder alloy in which the sum of Sb and Sn accounts for 80% by mass or more.
3〜15質量%のAg、及び、3〜10質量%のCuを含む、請求項1記載の、はんだ合金。   The solder alloy according to claim 1, comprising 3 to 15% by mass of Ag and 3 to 10% by mass of Cu. 1〜10質量%のBiを含む、請求項2に記載の、はんだ合金。   3. The solder alloy according to claim 2, comprising 1 to 10% by mass of Bi. 1〜5質量%のInを含む、請求項2又は3に記載の、はんだ合金。   The solder alloy according to claim 2, comprising 1 to 5% by mass of In. はんだ合金の粉末と、樹脂と、溶剤と、を含み、前記はんだ合金は、請求項1〜4のいずれか1項に記載のはんだ合金である、はんだペースト。   A solder paste comprising: a solder alloy powder; a resin; and a solvent, wherein the solder alloy is the solder alloy according to claim 1. 端子を有する電子部品と、配線部材と、前記端子と前記配線部材とを接合する接合部と、を備え、前記接合部は、請求項1〜4のいずれか1項に記載のはんだ合金を含む、電子部品モジュール。
An electronic component having a terminal, a wiring member, and a joining portion that joins the terminal and the wiring member, wherein the joining portion includes the solder alloy according to any one of claims 1 to 4. , Electronic components module.
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WO2022137754A1 (en) * 2020-12-23 2022-06-30 株式会社日立パワーデバイス Semiconductor device and method for producing same

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JPH0957487A (en) * 1995-08-25 1997-03-04 Kyocera Corp Brazing filler metal
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JP2013076143A (en) * 2011-09-30 2013-04-25 Energy Support Corp Alloy for fixing between ceramic and metal fitting, and power distribution apparatus
JP2018047489A (en) * 2016-09-22 2018-03-29 日本電波工業株式会社 Solder material and electronic component

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JPH0957487A (en) * 1995-08-25 1997-03-04 Kyocera Corp Brazing filler metal
JP2005138174A (en) * 2003-11-10 2005-06-02 Sumitomo Metal Mining Co Ltd Brazing filler metal, semiconductor equipment manufacturing method using the same, and semiconductor equipment
JP2013076143A (en) * 2011-09-30 2013-04-25 Energy Support Corp Alloy for fixing between ceramic and metal fitting, and power distribution apparatus
JP2018047489A (en) * 2016-09-22 2018-03-29 日本電波工業株式会社 Solder material and electronic component

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022137754A1 (en) * 2020-12-23 2022-06-30 株式会社日立パワーデバイス Semiconductor device and method for producing same

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