EP1101393A1 - Procede de brasage par refusion de composants electroniques utilisant des pre-depots d'alliage de brasure et dispositif de brasage pour la mise en oeuvre d'un tel procede - Google Patents
Procede de brasage par refusion de composants electroniques utilisant des pre-depots d'alliage de brasure et dispositif de brasage pour la mise en oeuvre d'un tel procedeInfo
- Publication number
- EP1101393A1 EP1101393A1 EP99929438A EP99929438A EP1101393A1 EP 1101393 A1 EP1101393 A1 EP 1101393A1 EP 99929438 A EP99929438 A EP 99929438A EP 99929438 A EP99929438 A EP 99929438A EP 1101393 A1 EP1101393 A1 EP 1101393A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support
- components
- brazing
- fluxing
- atmosphere
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/203—Fluxing, i.e. applying flux onto surfaces
-
- 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
- H05K3/3489—Composition of fluxes; Methods of application thereof; Other methods of activating the contact surfaces
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
Definitions
- the present invention relates to a soldering method by reflow of electronic components on a support (for example a printed circuit board), and also relates to a soldering device for the implementation of such a method.
- soldering consists in bringing the wafers carrying the electronic components to be soldered into contact with one or more waves of liquid solder alloy obtained by circulation of a solder bath contained in a tank, by means of a nozzle.
- the supports are previously fluxed in an upstream zone, using a flux spray or a flow foam, then preheated so as to activate the fluxes previously deposited, in order to clean the surfaces to be brazed, to elimination of oxides, organic contaminants,
- brazing alloy there is a quantity of brazing alloy at the connection locations of the components on the circuit, for example by screen printing a solder paste containing a mixture of metallic alloy and flux on the printed circuit before depositing the components to be soldered on.
- brazing alloy was pre-deposited (s) on the support, on component connection locations, remelt pre-deposit (s) ("remelting"), this is generally followed by an operation of leveling the surface of the previously remelted pre-deposits ( formation of "bumps" in English, we will refer to the SIPAD TM or OPTIPAD TM processes industrially available), or even by the fact that the brazing alloy has undergone for some components a pre-deposition on terminations components themselves. It is only then that the components are positioned on the support.
- the support provided with the components is then inserted into a reflow oven so as to provide the amount of heat necessary to allow the melting of the metal alloy, as well as the activation of the fluxing element contained in the paste or pre-deposit.
- the components are placed on support connection locations, and
- the said brazing alloy is available using one or more the following methods: i) the brazing alloy had been pre-deposited on the support at the connection locations of the components, pre-deposits having then undergone a reflow operation; j) the brazing alloy was pre-deposited on the locations / terminations of the components themselves, pre-deposits having then undergone a reflow operation;
- - prior to the component deposition step polymerizable glue is deposited on the bonding locations of the support, and the said adhesive is polymerized in order to bond the components to the support at the bonding locations ;
- a dry fluxing operation is carried out on the support by bringing this support into contact, at a pressure close to atmospheric pressure, with a fluxing atmosphere comprising excited or unstable species, and substantially free of electrically charged species.
- the method according to the invention can also include one or more of the following steps: the fluxing atmosphere is obtained by passing an initial fluxing gas through an electrical discharge;
- the initial fluxing gas comprises a reducing gas mixture comprising hydrogen
- the fluxing atmosphere is obtained at a gas outlet from an apparatus for forming excited or unstable species, in which the initial fluxing gas has been transformed; - Said support fluxing operation is carried out before or after the adhesive deposit; said support fluxing operation is carried out after depositing the components on the support; said heat treatment of the support is carried out in order to carry out said brazing of the components using said brazing alloy, by bringing the support into contact, at a pressure close to atmospheric pressure, with a treatment atmosphere comprising excited chemical species or unstable and substantially devoid of electrically charged species, the atmosphere being obtained by passing an initial treatment gas through an electrical discharge, and the heat treatment of the support being obtained by means of the chemical species thus heated under the action of dump ;
- the initial treatment gas comprises a reducing gas mixture comprising hydrogen
- the treatment atmosphere is obtained at a gas outlet from an apparatus for forming excited or unstable species, in which the initial treatment gas has been transformed;
- said fluxing operation is carried out by means of two apparatuses for forming excited or unstable chemical species, each arranged opposite one of the faces of the support; the steps of placing the components and of soldering being carried out on the two large faces of the support, said treatment operation is carried out by means of two apparatuses for forming excited or unstable chemical species, each arranged opposite one of the support faces; the method further comprises a step of cooling the support, after brazing, by passing the support through a cooling atmosphere comprising a neutral gas; - The alloy pre-deposit had after remelting been the object of a planarizing operation of its surface.
- the invention also relates to a device for soldering by reflow of electronic components on a support using a solder alloy, for the implementation of the method described above, characterized in that it comprises a member for conveying supports carrying, on at least one of their faces the components to be brazed on support connection locations, the conveying member ensuring the transfer of supports opposite first means allowing the polymerization of glue points present on locations for bonding the support, and opposite second means comprising at least one apparatus for forming a fluxing atmosphere comprising excited or unstable chemical species and being substantially devoid of electrically charged species, fluxing atmosphere usable for producing, at a pressure close to atmospheric pressure, dry fluxing of the support.
- the second means are located upstream of the first means.
- the second means are located downstream of the first means.
- the device advantageously comprises, along the conveying member, downstream of the first and second means, at least one apparatus for forming a treatment atmosphere comprising excited or unstable chemical species and being substantially devoid of electrically charged species , treatment atmosphere, the temperature of which makes it usable for carrying out a heat treatment of the support, with a view to the actual soldering of the components.
- pressure close to atmospheric pressure is understood to mean a pressure advantageously situated in the interval [0.1 x 10 ⁇
- the "support” on which the components according to the invention are soldered can be very varied in nature, depending on the different supports used in the electronics industry , it is the same of course with regard to the electronic components to be soldered.
- it may be supports of the printed circuit type (whatever their surface finish or finish), or even, for example, metallized ceramic supports such as hybrid circuits, or even housing bottoms on which must be soldered. circuits in a global encapsulation process.
- the components concerned can be extremely varied, from the electronic components traditional passive or active up to more complex and delicate components of handling, whether they are encapsulated or bare chips (BGA, CM, Flip Chips etc.).
- the "components” according to the invention may also consist of circuits which must be soldered on another support or even on a bottom of the housing before encapsulation.
- FIG. 1 is a diagrammatic view of a brazing device for implementing the method according to the invention
- - Figure 2 is a schematic sectional view of an example of a module for forming excited or unstable chemical species forming part of the device of Figure 1;
- FIG. 1 shows a general view of a reflow soldering device suitable for implementing the method according to the invention.
- This device comprises a conveyor member 10 comprising a belt 12, shown in phantom, disposed in an enclosure 14 and extending between two guide rollers, 16 and 18, at least one of which is motor.
- a set of printed circuit supports such as 20, on at least one of the large faces of which are arranged a set of electronic components, such as 22, which is suitable to braze.
- the electronic components are arranged at connection locations on which solder points have been pre-deposited, for example an alloy of tin and lead, the points having been flattened after their reflow. Furthermore, points of a polymerizable adhesive suitable for the intended use have been deposited on suitable bonding points of the support (for example on polymeric surfaces of a printed circuit, between two connection locations), ensuring the maintenance components in place during their subsequent soldering.
- the mat 12 ensures the transfer of the printed circuit supports 20 carrying the components 22 opposite a first station 24 allowing by thermal transfer the polymerization of the glue deposited (for example by radiation), then through a second fluxing station 26 by dry route of the support. Finally, the belt 12 ensures the transfer of the supports 20, downstream from the second station 26 to a cooling station 30 at which the supports are arranged in a nitrogen atmosphere.
- the second fluxing station 26 can be considered as being confused with a treatment station 28, both constituted by a module 32 for forming a treatment and fluxing gas comprising excited chemical species or unstable and substantially free of electrically charged species.
- the components 22 are arranged on one of the large faces of the support 20, the module 32 for forming excited or unstable species being turned towards this face.
- the device can comprise two modules 32 for forming excited chemical species or unstable, each arranged opposite one of the faces of the support 20.
- the module 32 has the function of passing an initial fluxing gas, advantageously comprising a reducing gas mixture, for example based on nitrogen and hydrogen, supplemented, if necessary with steam, through an electric discharge , inside which the initial gas is transformed, so as to generate, at the gas outlet of the module, the fluxing atmosphere which comprises the excited or unstable gaseous species and which is substantially devoid of electrically charged species (situation post-discharge).
- an initial fluxing gas advantageously comprising a reducing gas mixture, for example based on nitrogen and hydrogen, supplemented, if necessary with steam
- FIG. 2 There is shown in Figure 2 a sectional view of an example of module 32 capable of generating such chemical species.
- the module 32 comprises a first tubular electrode 34, formed for example by an internal face of a metal block 36, and in which is concentrically disposed an assembly formed of a tube made of dielectric material 38, for example made of ceramic, on the internal face of which is deposited, by metallization, a second electrode 40, excessively thickened in FIG. 2, in order to improve clarity.
- the block 36 comprises, diametrically opposite, two longitudinal slots 46 and 48 respectively forming the inlet of the initial treatment gas to be transformed (excited) in the passage 42 and the outlet of the treatment or fluxing atmosphere stream comprising the gaseous species excited or unstable but substantially free of electrically charged species.
- the slots 46 and 48 extend over the entire axial length of the cavity 42.
- the block 36 also advantageously comprises, at the periphery of the first electrode 34, a plurality of conduits, such as 50, for the passage of a cooling fluid, for example water. It can also be seen in FIG. 2 that the slot
- gas inlet communicates with a homogenization chamber 52 formed in a housing 54 attached to the block 36 and having a pipe 56 for initial gas supply.
- the module is completed by an electric generator 58 at high voltage and high frequency intended to generate a discharge in the gas mixture circulating in the gas passage 42 so as to cause, by ionization, an excitation of the gas molecules entering into its constitution and to thus generating excited or unstable chemical species, in particular H * or H 2 ' radicals, which deoxidize and decontaminate the surface of the printed circuit supports 20 (FIG. 1).
- supports 20 are used on which brazing alloy has been pre-deposited, remelted and then flattened, in connection locations of the components.
- the components are then placed on the connection locations and the supports thus prepared are placed on the conveying member, in particular on the belt 12.
- the latter transfers the wafers from the loading station to the first adhesive polymerization station 24, and the circuit is thus preheated.
- the supports are transferred to the module 32 for forming excited or unstable chemical species, described above with reference to FIG. 2, at which level the supports, on the one hand, undergo an operation of fluxing, under the action of the chemical species delivered by the module 32 and, on the other hand, under the action of the heat transmitted to these excited species under the effect of the discharge, the components are brazed on the support.
- the process continues with a cooling step, under the action of a flow of nitrogen supplied to the cooling station 30.
- the first stage of thermal treatment of polymerization and preheating of the support is carried out by means of a specific station 24.
- the invention which has just been described makes it possible to perform reflow soldering without flux and without traditional solder paste, thus making it much more certain to avoid a subsequent operation of cleaning the circuits, and therefore a a fortiori the use of chlorinated solvents - the supply of solder alloy, necessary for the formation of solder joints, is obtained by pre-deposition on connection locations on the support, and / or on locations / terminations of components proper, all without the presence of chemical flux (pre-deposits / reflow / preferably flattened);
- the combination of the steps of the invention provides an effective response to the problem posed, and therefore makes it possible to adapt to the inexorable evolution of microelectronics which wants to go towards ever more integration, while maintaining reliability. high but avoiding the cleaning steps that the international protocols related to the environment regulate in a strict way, objectives it is conceivable that can appear very difficult to reconcile.
- the invention has been particularly exemplified in the foregoing by positioning a training module on the path of the supports the treatment or fluxing atmosphere (or even one module per side), it is of course possible to envisage the presence of several modules in series and / or parallel allowing the required effect to be obtained, but one can also envisage (depending on the case of each user site) the fact of putting in place, opposite one or each face of the support, only one module (whether it is processing or fluxing), by carrying out successive ironings next to the module to achieve the desired effect.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Engineering (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9809774A FR2781974B1 (fr) | 1998-07-30 | 1998-07-30 | Procede de brasage par refusion de composants electroniques utilisant des pre-depots d'alliage de brasure et dispositif de brasage pour la mise en oeuvre d'un tel procede |
FR9809774 | 1998-07-30 | ||
PCT/FR1999/001658 WO2000007418A1 (fr) | 1998-07-30 | 1999-07-08 | Procede de brasage par refusion de composants electroniques utilisant des pre-depots d'alliage de brasure et dispositif de brasage pour la mise en oeuvre d'un tel procede |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1101393A1 true EP1101393A1 (fr) | 2001-05-23 |
Family
ID=9529207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99929438A Withdrawn EP1101393A1 (fr) | 1998-07-30 | 1999-07-08 | Procede de brasage par refusion de composants electroniques utilisant des pre-depots d'alliage de brasure et dispositif de brasage pour la mise en oeuvre d'un tel procede |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1101393A1 (fr) |
JP (1) | JP2002521851A (fr) |
KR (1) | KR20010070971A (fr) |
CN (1) | CN1308838A (fr) |
AU (1) | AU4625499A (fr) |
BR (1) | BR9912555A (fr) |
CA (1) | CA2338181A1 (fr) |
FR (1) | FR2781974B1 (fr) |
HU (1) | HUP0104913A2 (fr) |
TW (1) | TW434073B (fr) |
WO (1) | WO2000007418A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6468833B2 (en) | 2000-03-31 | 2002-10-22 | American Air Liquide, Inc. | Systems and methods for application of substantially dry atmospheric plasma surface treatment to various electronic component packaging and assembly methods |
CN104002005B (zh) * | 2014-06-16 | 2018-12-14 | 贵州永红航空机械有限责任公司 | 铝合金气路板真空钎焊及热处理一体化工艺 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5954292A (ja) * | 1982-09-21 | 1984-03-29 | 松下電器産業株式会社 | 印刷配線板の製造法および加熱装置 |
DE4126913A1 (de) * | 1991-08-14 | 1993-02-18 | Siemens Ag | Verfahren zum beloten und montieren von leiterplatten mit bauelementen |
US5345056A (en) * | 1991-12-12 | 1994-09-06 | Motorola, Inc. | Plasma based soldering by indirect heating |
JP3365511B2 (ja) * | 1993-04-05 | 2003-01-14 | セイコーエプソン株式会社 | ろう材による接合方法及び装置 |
FR2713528B1 (fr) * | 1993-12-15 | 1996-01-12 | Air Liquide | Procédé et dispositif de fluxage par voie sèche de surfaces métalliques avant brasage ou étamage. |
FR2735054B1 (fr) * | 1995-06-09 | 1997-07-25 | Air Liquide | Procede de fluxage par voie seche de surfaces metalliques avant brasage ou etamage utilisant une atmosphere comportant de la vapeur d'eau |
-
1998
- 1998-07-30 FR FR9809774A patent/FR2781974B1/fr not_active Expired - Fee Related
-
1999
- 1999-07-08 JP JP2000563113A patent/JP2002521851A/ja active Pending
- 1999-07-08 WO PCT/FR1999/001658 patent/WO2000007418A1/fr not_active Application Discontinuation
- 1999-07-08 EP EP99929438A patent/EP1101393A1/fr not_active Withdrawn
- 1999-07-08 KR KR1020017000667A patent/KR20010070971A/ko not_active Application Discontinuation
- 1999-07-08 AU AU46254/99A patent/AU4625499A/en not_active Abandoned
- 1999-07-08 BR BR9912555-2A patent/BR9912555A/pt not_active Application Discontinuation
- 1999-07-08 HU HU0104913A patent/HUP0104913A2/hu unknown
- 1999-07-08 CN CN99808478A patent/CN1308838A/zh active Pending
- 1999-07-08 CA CA002338181A patent/CA2338181A1/fr not_active Abandoned
- 1999-07-13 TW TW088111843A patent/TW434073B/zh not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0007418A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU4625499A (en) | 2000-02-21 |
TW434073B (en) | 2001-05-16 |
CA2338181A1 (fr) | 2000-02-10 |
HUP0104913A2 (en) | 2002-05-29 |
FR2781974A1 (fr) | 2000-02-04 |
BR9912555A (pt) | 2001-05-02 |
CN1308838A (zh) | 2001-08-15 |
WO2000007418A1 (fr) | 2000-02-10 |
FR2781974B1 (fr) | 2000-08-25 |
JP2002521851A (ja) | 2002-07-16 |
KR20010070971A (ko) | 2001-07-28 |
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