WO2008022530A1 - Brasure à l'étain et procédé de soudure par presse chauffante l'utilisant - Google Patents

Brasure à l'étain et procédé de soudure par presse chauffante l'utilisant Download PDF

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Publication number
WO2008022530A1
WO2008022530A1 PCT/CN2007/002262 CN2007002262W WO2008022530A1 WO 2008022530 A1 WO2008022530 A1 WO 2008022530A1 CN 2007002262 W CN2007002262 W CN 2007002262W WO 2008022530 A1 WO2008022530 A1 WO 2008022530A1
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WO
WIPO (PCT)
Prior art keywords
solder paste
tin
hot press
soldering
tin powder
Prior art date
Application number
PCT/CN2007/002262
Other languages
English (en)
French (fr)
Inventor
Poshan Huang
Original Assignee
Poshan Huang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Poshan Huang filed Critical Poshan Huang
Publication of WO2008022530A1 publication Critical patent/WO2008022530A1/zh

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/26Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
    • B23K35/262Sn as the principal constituent
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/30Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3457Solder materials or compositions; Methods of application thereof
    • H05K3/3485Applying solder paste, slurry or powder
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/36Assembling printed circuits with other printed circuits
    • H05K3/361Assembling flexible printed circuits with other printed circuits
    • H05K3/363Assembling flexible printed circuits with other printed circuits by soldering
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203Fillers and particles
    • H05K2201/0206Materials
    • H05K2201/0209Inorganic, non-metallic particles
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203Fillers and particles
    • H05K2201/0206Materials
    • H05K2201/0212Resin particles
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203Fillers and particles
    • H05K2201/0206Materials
    • H05K2201/0215Metallic fillers
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/20Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
    • H05K2201/2036Permanent spacer or stand-off in a printed circuit or printed circuit assembly
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/02Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
    • H05K2203/0278Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive

Definitions

  • the invention relates to a structure of a solder paste and a method for hot-press welding using the solder paste, in particular to a support body, which can reduce the overflow phenomenon of the solder paste, prevent the solder from being connected to each other, and can effectively avoid the short circuit.
  • the hot press is widely used in the welding of electronic products such as Flexible Principal Citrus (FPC) and Circuit Board (Pr inted Circuit Board) to realize the mechanical relationship between each other. And electrical connection.
  • Hot presses are generally divided into two types: thermostatic and pulsed. However, whether it is a thermostatic or pulsed hot press, the main control parameters that affect process quality are temperature, pressure, and heating time.
  • the hot press machine melts the solder paste by heating and pressing for a certain period of time to realize the joining of the two interfaces of the upper and lower pre-welding, and then cooling to solidify the solder paste, and the upper and lower surfaces are fixed by the solder paste.
  • the solder paste should be completely bonded to the interface; 2.
  • the thickness of the solder paste should exceed a certain critical value to make the tin layer have sufficient strength;
  • the solder paste should not overflow too much to avoid short circuit with adjacent lines.
  • the specific temperature, pressure and working time will be set on the indenter.
  • the temperature is usually higher than the melting point of the solder paste. Too low a temperature does not allow the solder paste to completely contact the interface. However, too high a temperature causes the solder paste to be too fluid, and the solder paste overflows to form a short circuit.
  • the hot press will set the most suitable pressure value according to the best condition of many experiments.
  • the pressure is too low, the solder paste and the interface cannot be effectively contacted.
  • the pressure is too high, the solder paste easily overflows, causing the thickness of the tin layer to decrease.
  • the hot press is also set to the most suitable time value according to the best condition of many experiments. If the time is too short, the solder paste has not melted and does not form good contact with the interface, and an open circuit may be formed. When the hot press is working, the set time, pressure, and temperature deviations may cause a short circuit caused by the overflow of the solder paste, or a good connection interface may not be formed, resulting in poor contact.
  • the object of the present invention is to overcome the defects of the prior solder paste and provide a solder paste of a novel structure.
  • the technical problem to be solved is to provide a solder paste which can reduce the overflow of the solder paste, which is very suitable for the solder paste. practical.
  • Another object of the present invention is to overcome the shortcomings of the prior art hot press welding method and to provide a new hot press welding method.
  • the technical problem to be solved is to provide a method for reducing solder paste overflow.
  • the hot press welding method is more suitable for practical use.
  • a solder paste according to the present invention comprises tin powder and at least one support, and the support and the tin powder are mixed in a certain ratio.
  • the object of the present invention and solving the technical problems thereof can be further realized by the following technical measures.
  • the solder paste described above, wherein the tin powder is made of tin metal or an alloy composed of at least two metals selected from the group consisting of tin, silver, copper, lead, antimony, bismuth, and zinc. , cadmium, indium, iron, nickel, antimony and gold.
  • solder paste of the foregoing wherein the solder paste further comprises a flux, the support body, the tin powder and the soldering
  • the agents are mixed in a certain ratio.
  • the support is capable of withstanding a temperature higher than the temperature at which the tin powder is melted, or capable of withstanding temperatures above 130 degrees Celsius.
  • the support body has a certain width or height which is set according to the thickness of the solder paste to be realized after pressing.
  • the support body is a solid particle, wherein the solid particle is one or more of a glass ball, a metal ball and an engineering plastic ball.
  • a hot press welding method comprising the steps of: providing a hot press having a carrier and an indenter; providing two pre-autoclaved workpieces disposed on the hot press Positioning on the carrier; providing at least one support within the pressing range of the indenter of the hot press; applying solder paste to the soldering interface of the workpiece, wherein the solder paste comprises tin powder and flux; The ram that moves the hot press heats the soldering interface of the two workpieces, and melts the solder paste to engage the two soldering interfaces, wherein the support supports the ram to provide a space to accommodate the molten solder paste.
  • the object of the present invention and solving the technical problems thereof can be further achieved by the following technical measures.
  • the aforementioned hot press welding method further includes a cooling step of cooling the two soldering interfaces of the two workpieces, solidifying the solder paste, electrically and mechanically connecting the upper and lower soldering interfaces of the two workpieces.
  • the tin powder is made of tin metal or an alloy composed of at least two metals selected from the group consisting of tin, silver, copper, lead, bismuth, bismuth , zinc, cadmium, indium, iron, nickel, antimony and gold.
  • the support body is resistant to a temperature higher than a temperature at which the tin powder is melted, or capable of withstanding a temperature of more than 130 degrees Celsius.
  • thermocompression bonding method wherein the support body has a certain width or height which is set according to the thickness of the solder paste to be achieved after the press-fitting.
  • the support body is premixed in the solder paste, wherein the support body, the tin powder and the flux are mixed in a certain ratio.
  • the support body is a strip which is spread on the uniformly mixed tin powder and the flux by first coating the uniformly mixed tin powder and the flux.
  • the support body is a solid particle, wherein the solid particle is one or more of a glass ball, a metal ball and an engineering plastic ball, and is doped with a uniformly mixed tin powder and a helper.
  • the flux In the flux.
  • the support body is a soldering interface previously provided on one of the two workpieces, or a splicing interface formed in one of the two workpieces in an integrally formed manner on.
  • a solder paste is proposed, the structure comprising tin powder, a flux and a support, the support, the tin powder and the flux being uniformly mixed in a certain ratio.
  • the support is capable of withstanding a temperature higher than a temperature at which the tin powder is melted; preferably, the support is at least resistant to temperatures of up to 130 degrees Celsius.
  • the support body has a width or height which is set according to the thickness of the solder paste to be achieved after the press-fitting.
  • the present invention further provides a hot press welding method, the method comprising the following steps: Step 1: providing a hot pressing device having a carrier and an indenter; Step 2: providing The two workpieces pre-welded by hot press welding are disposed on the carrier of the hot pressing device and positioned; Step 3: applying a solder paste and a support body to the soldering interface of the workpiece, the solder paste including tin powder and flux, The support body may be used before being mixed with the solder paste, or may be applied to the soldering interface of the workpiece, wherein the support body, the tin powder and the flux are uniformly mixed in a certain ratio; Step 4: using a hot press The indenter heats the soldering interface of the two workpieces, and the molten solder pastes the soldering interface, wherein the solder paste support is supported between the two soldering interfaces.
  • the hot press welding method further comprises a cooling step of cooling the two solder joints of the two workpieces, solidifying the solder paste, and joining the two workpieces.
  • the solder paste of the present invention and the method thereof for hot press welding have at least the following advantages and advantageous effects:
  • the solder paste and the hot press welding method of the present invention provide a space for supporting solder paste by using a solder paste having a support body.
  • the support body can maintain a fixed height between the two soldering interfaces to accommodate the support body to remain in the space.
  • the support body can greatly reduce the interaction of temperature, pressure and time, that is, the flowability of the solder paste can be reduced when the temperature is too high, and the solder paste overflow can be avoided to form a short circuit; in addition, the time is too long or the pressure can be reduced.
  • the solder paste of the present invention can reduce the overflow phenomenon of the solder paste, prevent the solder from being connected to each other, and can effectively avoid the occurrence of the short circuit phenomenon, and conforms to the integration of the integrated (integrated body) in the information age. Claim.
  • the present invention relates to a solder paste and a method thereof for use in thermocompression bonding.
  • the solder paste comprises a tantalum powder, a flux and a support, and the support is dispersed in the tin powder and the auxiliary agent.
  • the solder paste provided by the invention and the thermocompression bonding method thereof can be widely applied to tin soldering of FPC and FPC, or tin soldering of FPC and PCB, and the solder paste of the doping support of the invention can be pressed The way of soldering is to bond the component to the PCB.
  • the invention has the above-mentioned many advantages and practical values, and has great improvement in product structure, processing method or function, has significant progress in technology, and has produced useful and practical effects, and is more existing.
  • the solder paste and its hot-press welding method have an outstanding outstanding effect, which is more suitable for practical use, and is a novel, progressive and practical new design.
  • solder paste and the method thereof applied to the thermocompression bonding according to the present invention are specifically implemented below with reference to the accompanying drawings and preferred embodiments.
  • the methods, structures, methods, steps, features and their functions are described in detail later.
  • a delineation method such as Des ign Of Exper iment (DOE), with multiple experiments, the best match between the three parameters.
  • DOE Des ign Of Exper iment
  • the solder paste of the first embodiment of the present invention includes tin powder, a flux, and a support.
  • the above tin powder the composition of which is tin metal or an alloy composed of at least two metals selected from the group consisting of: tin, silver, copper, lead, antimony, bismuth, zinc, cadmium, indium , iron, nickel, bismuth and gold.
  • the above fluxes include rosin, chemical solvents, catalysts and additives; wherein: the rosin is used to form a protective film to increase viscosity.
  • the chemical solvent is used to decompose chemicals and evaporate to control viscosity and fluidity during preheating.
  • the catalyst is used for scavenging oxides for decomposing metal surface oxides to promote warming. This additive is used to control the stability of the solder paste and adjust the viscosity.
  • the above support body is a strip or a solid particle such as a glass ball, a metal ball, an engineering plastic ball or the like.
  • the support body can withstand a temperature higher than the temperature at which the tin powder is melted; preferably, the support body can withstand at least a high temperature of 130 degrees Celsius or higher, and has a specific size (height or width), which is determined according to the pressing force.
  • the achieved solder paste thickness setting that is, the solid particles are slightly larger than the thickness of the solder paste to be realized, and the size setting can also be adjusted according to the elastic deformation ability of different materials of the solid particles.
  • the solder paste is used to maintain a constant height between the two pre-bonding interfaces when the solder paste is subjected to pressure by the indenter, and the support body has rigidity or elasticity to accommodate the molten solder paste. Stay in this space. Thereby, the support can be greatly reduced
  • the interaction of temperature, pressure and time can reduce the flow of solder paste when the temperature is too high, avoid the solder paste overflow and form a short circuit. It can also reduce the solder paste easily overflowing when the time is too long or the pressure is too high, and prevent the tin layer. The thickness is reduced.
  • the support can be formed in the solder paste by various means, for example: when the support is a solid particle, the solid particles can be doped into the uniformly mixed tin powder and the flux by doping; When the support is a single piece, it can be spread on the uniformly mixed tin powder and the flux by applying the uniformly mixed tin powder and the flux.
  • Step 1 providing a hot pressing device, which may be a constant temperature hot press or a pulse hot press, the hot press having two carriers, a pressing head and a cooling device;
  • a hot pressing device which may be a constant temperature hot press or a pulse hot press, the hot press having two carriers, a pressing head and a cooling device;
  • Step 2 providing two pre-autoclaved workpieces, respectively setting the two workpieces on the two carriers of the hot pressing device and performing relative positioning;
  • Step 3 applying a solder paste to the soldering interface of the workpiece, and providing at least one support body within the pressing range of the indenter of the hot press, wherein the solder paste comprises tin powder and a flux; preferably,
  • the support may be mixed in advance in a certain proportion in the tin bone and the flux.
  • the support is a strip or a solid particle such as a glass ball, a metal ball, an engineering plastic ball, and the like.
  • the support is resistant to a temperature higher than the temperature at which the tin powder is melted.
  • the support is capable of withstanding at least a high temperature of more than 130 degrees Celsius, and has a specific size (height or width), which is according to the press-fit.
  • the thickness of the solder paste to be realized is set, that is, the solid particles are slightly larger than the thickness of the solder paste to be realized, and the size thereof can be adjusted according to the elastic deformation ability of different materials of the solid particles.
  • the solid particles when the support is a solid particle, the solid particles may be doped into the uniformly mixed tin powder and the flux by doping; when the support is a strip, it may be mixed by first coating After the tin powder and the flux, the strip is dispersed on the uniformly mixed tin powder and the flux; in addition, the support may be preset in the pressing range of the indenter of the hot press or preset in the above a soldering interface of one of the two workpieces may be formed in advance on the soldering interface of one of the two workpieces;
  • Step 4 performing hot pressing; moving the indenter of the hot press on the two workpieces, and melting the solder paste by heating and pressing for a certain period of time to realize joining of the two soldering interfaces above and below the two workpieces;
  • Step 5 Perform cooling; remove the indenter of the hot press, cool the two soldering interfaces of the two workpieces through the cooling device, solidify the solder paste, and mechanically and electrically connect the upper and lower soldering interfaces of the two workpieces through the solder paste.
  • the hot-press welding method of the present invention maintains a fixed height between the two soldering interfaces by using the support body to provide a space for supporting the solder paste, so that the solder paste is subjected to the pressure of the indenter after being melted.
  • the support body may be pre-mixed in the solder paste, or may be directly disposed in the press-fit range of the indenter of the hot press, and may be implemented. Borrow Therefore, the support can greatly reduce the interaction of temperature, pressure and time, that is, the flow of the solder paste can be reduced when the temperature is too high, and the solder paste can be prevented from overflowing to form a short circuit; and the time is too long or the pressure is too high.
  • the solder paste easily overflows and prevents the thickness of the tin layer from decreasing.
  • the pressure setting of the hot press is greater than a certain critical pressure, which is sufficient to completely contact the two interfaces with the support body, and the excessive pressure does not affect the support.
  • the time setting of the hot press during operation is as long as it is greater than a certain critical time, which is sufficient for the solder paste to fully flow to the entire interface to be joined, and the long time is not caused by the pressure of the indenter.
  • the solder paste overflows and is shorted.
  • the temperature is set higher than the melting point, and the solder paste is sufficient to fully contact the interface. Excessive temperatures will not cause overflow.
  • solder paste or thermocompression bonding method provided by the invention can be applied to tin soldering of FPC and FPC, or electrical and mechanical connection of isoelectric elements of FPC and PCB solder, and using the doping of the invention
  • the solder paste of the support can be bonded to the PCB by pressure bonding.
  • the present invention relates to a solder paste and a method thereof for use in thermocompression bonding.
  • the solder paste includes tin powder, a flux, and a support dispersed in the tin powder and the flux.
  • the solder paste or thermocompression bonding method provided by the invention can be applied to the tin-bismuth bonding of PC and FPC, or the electrical and mechanical connection of the isoelectric elements of the FPC and the PCB, and using the doping of the invention
  • the solder paste of the support can be bonded to the PCB by pressure bonding.
  • the solder paste and the hot-press welding method of the present invention can provide a space for supporting the solder paste by using a solder paste having a support body, and the support body can maintain a constant between the two soldering interfaces when the pressure of the solder paste is subjected to the pressure of the indenter after melting.
  • the height to accommodate the molten solder paste remains in this space.
  • the support body can greatly reduce the interaction of temperature, pressure and time, that is, the solder paste fluidity can be reduced when the temperature is too high, and the solder paste overflow can be prevented to form a short circuit; or the time is too long or the pressure is too high.
  • the solder paste easily overflows and prevents the thickness of the tin layer from decreasing.
  • the solder paste and the hot press welding method of the invention can effectively reduce the overflow phenomenon of the solder paste, prevent the solder from being connected to each other, and avoid the occurrence of the short circuit phenomenon, which is in line with the integration of the information age. Integration requirements.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Description

锡膏及其应用于热压焊接的方法 技术领域
本发明涉及一种锡膏的结构及使用该锡膏进行热压焊接的方法,特别 是涉及一种具有支撑体, 可降低锡膏溢流现象, 防止焊锡之间彼此连接,而 能有效避免短路现象发生, 并符合集成整合化要求的锡膏及使用该锡膏进 行热压焊接的方法。 背景技术
随着资讯时代的来临, 资讯时代正带领着我们走向科技时尚新潮的尖 端。 同时,随着通讯产品的日新月异, 带动了消费性电子产品的兴起, 使得 个人电脑、 个人通讯系统、 数字电子通讯等产品在全球的销售量年年不断 增加。 因此, 在电路板上整合不同电子零件对所制造的电子产品而言更加 重要。 而且,由于携带型资讯电子产品与移动通讯产品朝着轻薄短小, 多功 能,高可靠度与低价化的趋势发展, 在电子产品的电路设计也必须朝集成整 合化方向迈进。
热压机被广泛的应用于工业上软性电路板 (Flexible Pr inted Ci rcui t, FPC)、 电路板(Pr inted Circui t Board, PCB)等电子产品之间的 焊接, 以实现彼此间的机械及电性连接。 热压机一般分为恒温式和脉冲式 两种型式。 然而,无论是恒温式或脉冲式的热压机, 影响制程品质的主要控 制参数都是温度、 压力、 加热时间这三项。 热压机均是通过一定时间的加 温加压熔化锡膏以实现上下预焊接的两个介面的接合, 然后再进行冷却,凝 固锡膏, 上下两介面靠锡膏完成固定。 对热压机工作制程中控制参数的控 制有三个目的: 1、 要让锡膏达到与介面完全接合; 2、 锡膏的厚度要超过 某一临界值, 以使锡层有足够的强度; 3、 锡膏不可溢出过多, 以免与临近 的线路形成短路。
热压机进行热压时,将在压头上设定特定温度、 压力与工作时间。 温度 通常要高于锡膏的熔点, 太低的温度无法使锡膏与介面完全接触。 然而,过 高的温度会使锡膏流动性过大, ]起锡膏溢流而形成短路。
另外, 热压机将根据多次实验的最佳状况设定一最适合的压力值,然而 压力过低时, 锡膏与介面无法有效接触。 压力过高时,锡膏容易溢流,使得 锡层的厚度降低。
再者, 热压机亦是根据多次实验的最佳状况设定一最适合时间值,若时 间过短则锡膏尚未熔化, 未与介面形成良好的接触, 将可能形成断路。 由于热压机工作时,其时间、 压力、 温度的设定偏差将可能导致锡膏溢 流引起短路, 或者未形成良好的连接介面, 造成接触不良。
然而为了符合资讯时代对集成(积体)整合化的要求, 电子零件必须相 当紧密地设置在电路板上, 使得电路板上与各电子零件端子对应的焊垫也 需要设计得相当接近。 于是, 当将电子零件焊接至电路板时, 经常因为电 子零件的焊垫之间非常接近, 引起焊垫之间溢流的焊锡彼此相连接,从而使 得造成短路现象的问题更加突出。
由此可见, 上述现有的锡膏及应用于热压垾接的方法在产品结构、 加 工方法与使用上,显然仍存在有不便与缺陷, 而亟待加以进一步改进。 为了 解决上述存在的问题, 相关厂商莫不费尽心思来谋求解决之道, 但长久以 来一直未见适用的设计被发展完成, 而一般产品及方法又没有适切的结构 及方法能够解决上述问题, 此显然是相关业者急欲解决的问题。 因此如何 能创设一种新的锡膏及其应用于热压焊接的方法,实属当前重要研发课题 之一,亦成为当前业界极需改进的目标。
有鉴于上述现有的锡膏及应用于热压焊接的方法存在的缺陷, 本发明 人基于从事此类产品设计制造多年丰富的实务经验及专业知识, 并配合学 理的运用, 积极加以研究创新, 以期创设一种新的锡膏及其应用于热压焊 接的方法, 能够改进一般现有的锡膏及应用于热压焊接的方法, 使其更具 有实用性。 经过不断的研究、 设计,并经反复试作样品及改进后,终于创设 出确具实用价值的本发明。 发明内容
本发明的目的在于, 克服现有的锡膏存在的缺陷,而提供一种新型结构 的锡膏, 所要解决的技术问题是使其提供一种可以减低锡膏溢流的锡膏,非 常适于实用。
本发明的另一目的在于, 克服现有的热压焊接的方法存在的缺陷,而提 供一种新的热压焊接的方法, 所要解决的技术问题是使其提供一种可以减 低锡膏溢流的热压焊接方法, 从而更加适于实用。
本发明的目的及解决其技术问题是采用以下技术方案来实现的。 依据 本发明提出的一种锡膏,其包括锡粉及至少一支撑体,该支撑体及该锡粉以 一定比例混合。
本发明的目的及解决其技术问题还可釆用以下技术措施进一步实现。 前述的锡膏, 其中所述的锡粉的成分是为锡金属, 或是选自下列群组 中的至少两种金属以上所组成的合金: 锡、 银、 铜、 铅、 铋、 锑、 锌、 镉、 铟、 铁、 镍、 锗与金。
前述的锡膏, 其中该锡膏还包括一助焊剂,该支撑体、 该锡粉及该助焊 剂以一定比例混合。
前述的锡膏, 其中所迷的支撑体能耐的温度高于该锡粉熔化的温度,或 能够耐 130摄氏度以上的温度。
前述的锡膏, 其中所迷的支撑体具有一定的宽度或高度,该宽度或高度 根据压合后欲实现的锡膏厚度设定。
前述的锡膏, 其中所述的支撑体为一条状物。
前述的锡膏, 其中所述的支撑体为一固态粒子,其中该固态粒子为玻璃 球、 金属球及工程塑胶球中的一种或多种。
本发明的目的及解决其技术问题还采用以下技术方案来实现。 依据本 发明提出的一种热压焊接方法, 其包括以下步骤: 提供一热压机, 其具有 承载体,及一压头; 提供二预进行热压焊接的工件, 设置于该热压机的该承 载体上并定位; 设置至少一支撑体于该热压机的该压头的压合范围内;涂布 锡膏于工件的焊接介面上,其中该锡膏包括锡粉与助焊剂; 以及移动该热压 机的该压头热压该二工件的焊接介面, 熔化该锡膏以接合二焊接介面,其中 该支撑体支撑该压头,以提供一空间容纳熔化的该锡膏。
本发明的目的及解决其技术问题还可采用以下技术措施进一步实现。 前述的热压焊接方法, 其进一步包括冷却步骤,冷却步骤即冷却二工件 的二焊接介面, 凝固锡膏,电性及机械连接二工件的上下二焊接介面。
前述的热压焊接方法, 其中所述的锡粉的成分是为锡金属,或是选自下 列群组中的至少两种金属以上所组成的合金:锡、 银、 铜、 铅、 铋、 锑、锌、 镉、 铟、 铁、 镍、 锗与金。
前述的热压焊接方法,其中所述的支撑体能耐的温度高于该锡粉熔化 的温度,或能够耐 1 30摄氏度以上的温度。
前述的热压焊接方法,其中所述的支撑体具有一定的宽度或高度,该宽 度或高度根据压合后欲实现的锡膏厚度设定。
前述的热压悍接方法,其中所述的支撑体是预先混合于该锡膏之中,其 中该支撑体、 该锡粉及该助焊剂是以一定比例混合。
前述的热压焊接方法,其中所述的支撑体为一条状物,该条状物通过先 涂布均匀混合的锡粉与助焊剂后,将其散布于均匀混合的锡粉与助焊剂上。
前述的热压焊接方法,其中所述的支撑体为一固态粒子,其中该固态粒 子为玻璃球、 金属球及工程塑胶球中的一种或多种,掺杂于均匀混合的锡粉 与助焊剂中。
前述的热压焊接方法,其中所述的支撑体是预先设置于所述的二工件 其中之一的焊接介面上, 或以一体成形的方式形成于所述的二工件其中之 一的垾接介面上。
本发明与现有技术相比具有明显的优点和有益效果。 由以上技术方案 可知,本发明的主要技术内容如下:
为了达到上述目的, 依据本发明提出一种锡膏, 其结构包括锡粉,助焊 剂以及一支撑体, 该支撑体、 该锡粉及该助焊剂以一定比例均匀混合。
在本发明锡膏的一较佳实施例中, 上述的支撑体能耐的温度高于该锡 粉熔化的温度; 较佳的, 该支撑体至少能够耐 130摄氏度以上高温。
在本发明锡膏的又一较佳实施例中, 上述的支撑体具有一定的宽度或 高度, 该宽度或高度根据压合后欲实现的锡膏厚度设定。
另外, 为了达到上述目的, 本发明又提出一种热压焊接方法, 该方法 包括以下步骤: 步骤 1 : 提供一热压装置, 该热压机具有承载体, 以及一压 头;步 2 : 提供预进行热压焊接的二工件, 设置于该热压装置的承载体上 并定位; 步骤 3: 涂布锡膏及一支撑体于工件的焊接介面, 该锡膏包括锡粉 与助焊剂, 该支撑体是可以事先与该锡膏混合后使用, 亦可以先后涂布于 工件的焊接介面, 其中该支撑体、 该锡粉及该助焊剂是以一定比例均匀混 合;步骤 4: 利用热压机的压头热压该二工件的焊接介面, 熔化锡膏接合焊 接介面,其中该锡膏的支撑体支撑于二焊接介面之间。
在本发明热压焊接方法的一较佳实施例中, 该热压焊接方法进一步包 括一冷却步骤, 即冷却二工件的二焊接介面, 凝固锡膏, 连接二工件。
借由上述技术方案, 本发明锡膏及其应用于热压焊接的方法至少具有 下列优点及有益效果: 本发明锡膏及热压焊接方法通过利用具有支撑体的 锡膏提供支撑锡膏的空间, 可实现锡膏在熔化后, 受到压头的压力时,支撑 体能够在两焊接介面之间维持一个固定的高度, 以容纳支撑体在此空间存 留。 藉此,该支撑体可大幅减低温度、 压力和时间的交互影响, 即可以减低 温度过高时锡膏的流动性, 避免锡膏溢流而形成短路; 另外,也可减低时间 过长或压力过高时锡膏容易溢流, 防止锡层厚度降低。 因此,本发明锡膏在 热压焊接过程中,可降低锡膏溢流的现象, 防止焊锡之间彼此连接,进而能 够有效的避免短路现象发生, 符合资讯时代对集成 (积体)整合化的要求。
综上所述, 本发明是有关一种锡膏及其应用于热压焊接的方法。 该锡 膏,包括裼粉,助焊剂及一支撑体,该支撑体散布于该锡粉与助烊剂中。 本发 明提供的锡膏及其热压悍接方法可广泛应用于 FPC与 FPC的锡焊接合,或者 FPC与 PCB的锡焊接合,且利用本发明的掺杂支撑体的锡膏, 可以以压焊的 方式进行元件与 PCB之间的接合。 本发明具有上述诸多优点及实用价值,其 不论在产品结构、 加工方法或功能上皆有较大改进, 在技术上有显著的进 步,并产生了好用及实用的效果,且较现有的锡膏及其热压焊接方法具有增 进的突出功效,从而更加适于实用, 诚为一新颖、 进步、 实用的新设计。
上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的 技术手段, 而可依照说明书的内容予以实施,并且为了让本发明的上述和其 他目的、 特征和优点能够更明显易懂,以下特举较佳实施例,并配合附图,详 细说明如下。 附图的简要说明
无 实现发明的最佳方式
为更进一步阐述本发明为达成预定发明目的所釆取的技术手段及功 效,以下结合附图及较佳实施例, 对依据本发明提出的锡膏及其应用于热压 焊接的方法其具体实施方式、 结构、 方法、 步驟、 特征及其功效, 详细说 明如后。
有关本发明的前述及其他技术内容、 特点及功效,在以下配合参考图式 较佳实施例的详细说明中将可清楚的呈现。 通过具体实施方式说明,当可对 本发明为达成预定目的所采取的技术手段及功效得一更加深入且具体的了 解,然而所附图式仅是提供参考与说明之用,并非用来对本发明加以限制。
由于温度、 时间、 压力这三者同时都对热压后的产品品质有重要的影 响,三个参数彼此又有交互作用, 要得到良好的制程品质, 通常要借助
Des ign Of Exper iment (DOE)之类的实 计画法, 以多次的实验,取得三个 参数间最佳的搭配。
本发明第一实施例的锡膏, 包括锡粉、 助焊剂以及一支撑体。 其中: 上述的锡粉, 其成分是为锡金属,或是选自下列群组中的至少两种金属 以上所組成的合金: 锡、 银、 铜、 铅、 铋、 锑、 锌、 镉、 铟、 铁、 镍、 锗 与金。
上述的助焊剂, 包括松香, 化学溶剂, 催化剂及添加剂; 其中: 该松香, 用于成形成保护膜增加粘度。
该化学溶剂, 用于分解化学物, 在预热过程中蒸发控制粘度及流动性。 该催化剂, 用于清除氧化物, 用于分解金属表面氧化物促进温润作用。 该添加剂, 用于控制锡膏的稳定性, 调节粘度。
上述的支撑体,是一条状物或是一固态粒子,例如:玻璃球、 金属球、 工 程塑胶球等等。 该支撑体能耐的温度高于该锡粉熔化的温度; 较佳的,该支 撑体至少能够耐 130摄氏度以上的高温, 其具有一特定的大小(高度或宽 度),该大小根据压合后欲实现的锡膏厚度设定, 即该固态粒子略大于该欲 实现的锡膏厚度, 且其大小的设定亦可根据固态粒子的不同材料的弹性形 变能力进行调整。 该锡膏, 用以实现锡膏在熔化后, 受到压头的压力时,支 撑体能在两预接合介面之间维持一个固定的高度, 该支撑体为具有刚性或 一定弹性, 以容纳熔化锡膏在此空间存留。 藉此, 该支撑体可以大幅减低 温度、 压力和时间的交互影响,即能够减低温度过高时锡膏流动性、 避免锡 膏溢流而形成短路; 也可以减低时间过长或压力过高时锡膏容易溢流,防止 锡层厚度降低。
该支撑体可以通过各种方式形成于锡膏中, 例如: 当该支撑体为固态 粒子时, 可以通过掺杂的方式将固态粒子掺杂入均匀混合的锡粉与助焊剂 之中; 当该支撑体为一条状物时, 其可以通过涂布均勾混合的锡粉与助焊 剂后,将条状物散布于均匀混合的锡粉与助焊剂上。
本发明的第二实施例提供一种热压焊接方法,该热压焊接方法包括以 下步骤:
步驟 1 : 提供一热压装置,该热压装置可以是一恒温式热压机或是一脉 冲式热压机, 该热压机具有二承载体, 一压头及一冷却装置;
步骤 2 : 提供二预进行热压焊接的工件, 分别设置该二工件于热压装置 的二承载体并进行相对定位;
步骤 3: 涂布锡膏于工件的焊接介面上, 并设置至少一支撑体于该热压 机的该压头的压合范围内, 其中该锡膏包括锡粉与助焊剂; 较佳的, 该支 撑体可以预先以一定比例混合于锡骨及助焊剂之中。 该支撑体是一条状物 或是一固态粒子, 如: 玻璃球、 金属球、 工程塑胶球等等。 该支撑体能耐 的温度高于该锡粉熔化的温度, 较佳的, 该支撑体至少能够耐 1 30摄氏度 以上的高温, 其具有一特定的大小(高度或宽度), 该大小根据压合后欲实 现的锡膏厚度设定, 即该固态粒子略大于该欲实现的锡膏厚度, 且其大小 的设定亦可根据固态粒子的不同材料的弹性形变能力进行调整。 其中,当该 支撑体为固态粒子时, 可以通过掺杂的方式将固态粒子掺杂入均匀混合的 锡粉与助焊剂; 当该支撑体为一条状物, 其可以通过先涂布均勾混合的锡 粉与助焊剂后, 将条状物散布于均匀混合的锡粉与助焊剂上; 另外,支撑体 可以预先设置于该热压机的该压头的压合范围内或预先设置于上述二工件 其中之一的焊接介面上, 亦可以事先以一体成形的方式形成于上述二工件 其中之一的焊接介面上;
步骤 4 : 进行热压; 移动热压机的压头于二工件上, 通过一定时间的加 温加压熔化锡膏, 以实现二工件上下的两个焊接介面的接合;
步骤 5 : 进行冷却; 移去热压机的压头, 通过冷却装置冷却二工件的二 焊接介面, 凝固锡膏, 二工件的上下二焊接介面通过锡膏完成机械及电性 连接。
本发明的热压焊接方法, 通过利用支撑体用以提供支撑锡膏的空间,以 实现锡膏在熔化后, 受到压头的压力时, 支撑体能在两焊接介面之间,维持 一个固定的高度, 以容纳熔化锡膏在此空间存留,因此,支撑体可以预先混 合于锡膏中,亦可直接设置于热压机的压头的压合范围内,皆可以实施。 藉 此,该支撑体能够大幅减低温度、 压力和时间的交互影响, 即可以减低温度 过高时锡膏的流动性, 避免锡膏溢流而形成短路; 也可以减低时间过长或 压力过高时锡膏容易溢流, 防止锡层厚度降低。
籍由本发明提供的锡膏或热压方法, 该热压机的压力设定,只要大于某 一临界压力, 足以将两介面与此支撑体完全接触即可, 过高的压力也不会 影响支撑体替锡膏维持的空间。
并且, 该热压机在工作时的时间设定, 只要大于某一临界时间,足以让 锡膏充分流动到欲接合的整个介面即可, 过长的时间, 也不会因为压头的 压力导致锡膏溢流而短路。 温度设定要高于熔点, 并使锡膏足以与介面完 全接触即可, 过高的温度亦不会造成溢流。
本发明提供的锡膏或热压焊接方法, 可以应用于 FPC与 FPC的锡焊接 合,或者在 FPC与 PCB的锡焊接合等电性元件的电性及机械连接,且利用本 发明的掺杂支撑体的锡膏,可以以压焊的方式进行元件与 PCB之间的接合。
以上所述, 仅是本发明的较佳实施例而已, 并非对本发明作任何形式 上的限制, 虽然本发明已以较佳实施例揭露如上, 然而并非用以限定本发 明,任何熟悉本专业的技术人员, 在不脱离本发明技术方案范围内, 当可利 用上述揭示的方法及技术内容作出些许的更动或修饰为等同变化的等效实 施例, 但是凡是未脱离本发明技术方案的内容, 依据本发明的技术实质对 以上实施例所作的任何简单修改、 等同变化与修饰, 均仍属于本发明技术 方案的范围内。 工业应用性
本发明是有关于一种锡膏及其应用于热压焊接的方法。 该锡膏,包括锡 粉、 助焊剂以及一支撑体, 该支撑体散布于该锡粉与助焊剂中。 本发明提 供的锡膏或热压焊接方法, 可以应用于 PC与 FPC的锡悍接合,或者在 FPC 与 PCB 的锡焊接合等电性元件的电性及机械连接, 且利用本发明的掺杂支 撑体的锡膏, 可以以压焊的方式进行元件与 PCB之间的接合。
本发明锡膏及热压焊接方法, 通过利用具有支撑体的锡膏提供支撑锡 膏的空间, 可以实现锡膏在熔化后受到压头的压力时, 支撑体能在两焊接 介面之间维持一个固定的高度, 以容纳熔化锡膏在此空间存留。 藉此,该支 撑体可以大幅减低温度、 压力和时间的交互影响, 即可以减低温度过高时 锡膏流动性、 避免锡膏溢流而形成短路; 也可以减低时间过长或压力过高 时锡膏容易溢流, 防止锡层厚度降低。 因此, 本发明锡膏及热压焊接方法 在热压焊接的过程中, 可以有效的降低锡膏溢流现象, 防止焊锡之间彼此 连接, 而可避免短路现象的发生, 非常符合资讯时代对集成整合化的要求。

Claims

权 利 要 求
1、 一种锡膏,其特征在于其包括锡粉及至少一支撑体,该支撑体及该锡 粉以一定比例混合。
2、 根据权利要求 1 所述的锡膏,其特征在于其中所述的锡粉的成分是 为锡金属, 或是选自下列群组中的至少两种金属以上所组成的合金: 锡、 银、 铜、 铅、 铋、 锑、 锌、 镉、 铟、 铁、 镍、 锗与金。
3、 根据权利要求 1 所述的锡膏,其特征在于其中该锡膏还包括一助焊 剂,该支撑体、 该锡粉及该助焊剂以一定比例混合。
4、 根据权利要求 1 所述的锡膏,其特征在于其中所述的支撑体能耐的 温度高于该锡粉熔化的温度, 或能够耐 1 30摄氏度以上的温度。
5、 根据权利要求 1 所述的锡膏,其特征在于其中所述的支撑体具有一 定的宽度或高度, 该宽度或高度根据压合后欲实现的锡膏厚度设定。
6、 根据权利要求 1 所述的锡膏,其特征在于其中所述的支撑体为一条 状物。
7、 根据权利要求 1 所述的锡膏,其特征在于其中所述的支撑体为一固 态粒子,其中该固态粒子为玻璃球、 金属球及工程塑胶球中的一种或多种。
8、 一种热压焊接方法,其特征在于其包括以下步骤:
提供一热压机, 其具有承载体, 及一压头;
提供二预进行热压焊接的工件,设置于该热压机的该承载体上并定位; 设置至少一支撑体于该热压机的该压头的压合范围内;
涂布锡膏于工件的焊接介面上,其中该锡膏包括锡粉与助焊剂; 以及 移动该热压机的该压头热压该二工件的焊接介面, 熔化该锡膏以接合 二焊接介面, 其中该支撑体支撑该压头,以提供一空间容纳熔化的该锡膏。
9、 根据权利要求 8 所述的热压悍接方法,其特征在于其进一步包括冷 却步骤, 冷却步骤即冷却二工件的二焊接介面, 凝固锡膏,电性及机械连接 二工件的上下二焊接介面。
10、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的锡粉 的成分是为锡金属, 或是选自下列群组中的至少两种金属以上所组成的合 金:锡、 艮、 4同、 铅、 铋、 锑、 锌、 镉、 铟、 铁、 镍、 锗与金。
11、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体能耐的温度高于该锡粉熔化的温度,或能够耐 130摄氏度以上的温度。
12、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体具有一定的宽度或高度, 该宽度或高度根据压合后欲实现的锡膏厚度设 定。
13、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体是预先混合于该锡膏之中,其中该支撑体、 该锡粉及该助焊剂是以一定比 例混合。
14、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体为一条状物, 该条状物是通过先涂布均匀混合的锡粉与助焊剂后,将其散 布于均匀混合的锡粉与助焊剂上。
15、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体为一固态粒子,其中该固态粒子为玻璃球、 金属球及工程塑胶球中的一种 或多种, 掺杂于均匀混合的锡粉与助焊剂中。
16、根据权利要求 8所述的热压焊接方法,其特征在于其中所述的支撑 体是预先设置于所述的二工件其中之一的焊接介面上, 或以一体成形的方 式形成于所述的二工件其中之一的焊接介面上。
PCT/CN2007/002262 2006-08-17 2007-07-26 Brasure à l'étain et procédé de soudure par presse chauffante l'utilisant WO2008022530A1 (fr)

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GB2603488A (en) * 2021-02-04 2022-08-10 Rockwood Composites A soldering compound
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