CN219575584U

CN219575584U - Graphite boat for reducing welding stress of electronic components

Info

Publication number: CN219575584U
Application number: CN202320400903.3U
Authority: CN
Inventors: 王永彬; 王毅
Original assignee: Yangzhou Yangjie Electronic Co Ltd
Current assignee: Yangzhou Yangjie Electronic Co Ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-08-22
Anticipated expiration: 2033-03-06

Abstract

A graphite boat for reducing welding stress of electronic components relates to a semiconductor device preparation device. Comprises a boat body; the top of the boat body is provided with a cavity hollowed downwards to form a mounting station matched with a workpiece to be welded; surrounding tables are arranged around the mounting station; and positioning holes are respectively formed at two ends of the surrounding table. Specifically, the boat body has a plate-like structure. Specifically, the locating hole is provided with a locating pin which can be detached and fixedly connected. Specifically, a plurality of positioning holes matched with the workpieces to be welded are formed in the installation station. Specifically, the bottom of the boat body is provided with a plurality of detachably and fixedly connected brackets. Specifically, the support is equipped with four, can dismantle the fixed four corners that set up at the boat body respectively. The scaling powder can be brushed on a graphite boat and can also be brushed on a bottom die of the graphite boat.

Description

Graphite boat for reducing welding stress of electronic components

Technical Field

The utility model relates to a semiconductor device manufacturing tool, in particular to a graphite boat for reducing welding stress of electronic components.

Background

Most of electronic components in the soldering process need to adopt graphite with good thermal conductivity and easy processing as a soldering carrier, in order to avoid overlarge soldering stress caused by overlarge heating/cooling gradient in the soldering process, a gap is usually reserved in the design of a graphite jig for soldering, so that the purposes of reducing the temperature change gradient in the heating/cooling process and reducing the soldering stress are achieved through gas components in the gap.

The welding process of the electronic components adopting the brazing process, whether adopting the vacuum welding process or the reflow welding process, needs to input nitrogen or gas protective gas through the pipeline. The air source of the external input gas is normal temperature before entering the welding equipment, especially liquefied nitrogen which is most commonly used, the gasified nitrogen is input into the welding hearth, the continuously input normal temperature protective gas is usually at about 15 ℃ at the outlet of a pipeline, unstable vortex can be formed in the welding hearth, and uneven temperature distribution can be caused in the vortex.

The most commonly used soldering solders with different proportions have liquidus between 230 ℃ and 320 ℃, and when protective gas with lower temperature contacts liquefied solder, the solder surface contracts after being cooled due to temperature impact, and the wettability with the chip and the electrode surface is reduced, so that the wetting angle is increased, and the soldering stress is increased. Such abnormal effects are concentrated on the jig edge.

Disclosure of Invention

Aiming at the problems, the utility model provides a method for processing the steel wire rod, which is simple, convenient and flexible; the graphite boat which is high in efficiency and reduces the welding stress of electronic components is used for reducing the welding stress.

The technical scheme of the utility model is as follows: the graphite boat for reducing welding stress of electronic components comprises a boat body;

the top of the boat body is provided with a cavity hollowed downwards to form a mounting station matched with a workpiece to be welded;

surrounding tables are arranged around the mounting station;

and positioning holes are respectively formed at two ends of the surrounding table.

Specifically, the boat body is of a plate-shaped structure.

Specifically, the locating hole is provided with a locating pin which can be detached and fixedly connected.

Specifically, a plurality of connecting holes matched with the workpieces to be welded are formed in the mounting station.

Specifically, the bottom of the boat body is provided with a plurality of detachably and fixedly connected brackets.

Specifically, the support is equipped with four, can dismantle the fixed four corners that set up at the boat body respectively.

According to the scheme, workpieces to be welded are placed in the cavity, after the die is assembled, edges of the cavity are attached together, the atomized soldering flux is sealed in the cavity while the channel for the external lower-temperature protective gas to be absorbed is blocked, so that the emission of the atomized soldering flux is avoided, the time of the soldering flux acting on the workpieces is prolonged, the whole welding process is enabled, and the sufficient concentration of the soldering flux is achieved.

Rosin is the main component of the most commonly used soldering flux, abietic acid generated by the rosin at high temperature can reduce oxide layers on the electrode and the chip surface in the welding process, so that the purpose of improving the wetting angle of the solder is achieved, factors influencing the effectiveness of the soldering flux are concentration and acting time, and the graphite boat provided by the scheme aims at two main factors influencing the effect of the soldering flux by reducing the wetting angle of the solder and the heating/cooling gradient, so that the purpose of reducing the welding stress is achieved. The scaling powder can be brushed on a graphite boat and can also be brushed on a bottom die of the graphite boat.

Drawings

Figure 1 is a schematic view of the structure of the present utility model,

figure 2 is a schematic view of the connection state structure of the boat body and the bracket,

FIG. 3 is a schematic diagram of a connection state structure of a bottom die and a cover die of the graphite boat;

in the figure, 100 is a boat body, 110 is an installation station, 111 is a connecting hole, 120 is a surrounding table, 130 is a positioning hole, 131 is a positioning pin, 200 is a bracket, 10A is a bottom die, and 10B is a cover die.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the brazing process, a graphite boat is generally used as a carrier, and the bottom die 10A and the cover die 10B of the graphite boat are combined together, and the welding of the electrodes and the chips of the electronic components is completed after the welding is performed through a reflow soldering furnace. The design of locating pin 131 and locating hole 130 is passed through to this case, makes die block 10A and the laminating of the surface of cover die 10B be in the same place, avoids the nitrogen gas of pipeline output to get into the boat and influences the infiltration of solder. In the actual processing process, the boat body 100 with the structure of the scheme is directly taken, the cavity is upward and is used as the bottom die 10A, the cavity is downward and is used as the cover die 10B, after a workpiece to be welded is placed in the installation station 110, the cover die 10B is covered, the graphite boat bottom die 10A and the cover die 10B are combined together, positioning is realized through the positioning pins 131, and welding of the electrodes and the chips of the electronic components is completed after the reflow oven.

The utility model is shown in fig. 1-3; the graphite boat for reducing the welding stress of electronic components comprises a boat body 100;

the top of the boat body 100 is provided with a cavity hollowed downwards to form a mounting station 110 matched with a workpiece to be welded;

surrounding tables 120 are arranged around the installation station 110; the graphite boat bottom die 10A and the cover die 10B are combined together through the surrounding table 120, so that nitrogen output by a pipeline is prevented from entering the boat to influence the infiltration of solder;

positioning holes 130 are respectively formed at two ends of the surrounding table 120.

Further defined, the boat body has a plate-like structure.

Further preferably, the positioning hole 130 is provided with a positioning pin 131 which is detachably and fixedly connected. The positioning pins 131 are used for positioning the placement cover mold 10B.

Further preferably, a plurality of connecting holes 111 adapted to the workpieces to be welded are formed in the mounting station 110, axial materials can be inserted into the connecting holes 111, the purpose of positioning, assembling and assembling is achieved by matching with the design of counter bores, and finally the openings of the connecting holes 111 positioned outside the welding furnace are plugged by lead materials.

Further preferably, a plurality of detachable and fixedly connected brackets 200 are arranged at the bottom of the boat body 100.

The four brackets 200 are detachably and fixedly arranged at four corners of the boat body 100.

Rosin is the main component of the most commonly used soldering flux, abietic acid generated by the rosin at high temperature can reduce oxide layers on the electrode and the chip surface in the welding process, so that the purpose of improving the wetting angle of the solder is achieved, factors influencing the effectiveness of the soldering flux are concentration and acting time, and the graphite boat provided by the scheme aims at two main factors influencing the effect of the soldering flux by reducing the wetting angle of the solder and the heating/cooling gradient, so that the purpose of reducing the welding stress is achieved. The soldering flux can be brushed on a graphite boat and can also be brushed on a bottom die 10A of the graphite boat.

For the purposes of this disclosure, the following points are also described:

(1) The drawings of the embodiments disclosed in the present application relate only to the structures related to the embodiments disclosed in the present application, and other structures can refer to common designs;

(2) The embodiments disclosed herein and features of the embodiments may be combined with each other to arrive at new embodiments without conflict;

the above is only a specific embodiment disclosed in the present application, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The graphite boat for reducing the welding stress of the electronic components is characterized by comprising a boat body;

surrounding tables are arranged around the mounting station;

positioning holes are respectively formed at two ends of the surrounding table;

the boat body is provided with two boat bodies, the cavity faces upwards and is used as a bottom die, and the cavity faces downwards and is used as a cover die; the bottom die and the cover die are combined together, positioning is realized through the positioning pin, and the phenomenon that the infiltration of solder is influenced due to the fact that nitrogen output by the pipeline enters the boat is avoided.

2. The graphite boat for reducing soldering stress of electronic components according to claim 1, wherein a boat body of said graphite boat has a plate-like structure.

3. The graphite boat for reducing soldering stress of electronic components according to claim 1, wherein said positioning holes are provided with positioning pins detachably and fixedly connected.

4. The graphite boat for reducing welding stress of electronic components according to claim 1, wherein a plurality of connecting holes adapted to workpieces to be welded are formed in the mounting station.

5. The graphite boat for reducing welding stress of electronic components according to claim 1, wherein a plurality of detachably and fixedly connected brackets are arranged at the bottom of the boat body.

6. The graphite boat for reducing welding stress of electronic components according to claim 5, wherein the number of the brackets is four, and the brackets are detachably and fixedly arranged at four corners of the boat body.