Sintering clamp

Abstract

The utility model discloses a sintering clamp, which belongs to the technical field of electronic packaging and comprises a clamp body, a plurality of groups of first bumps are symmetrically and fixedly connected to the edge of the top of the clamp body, and a second bump is fixedly connected to the center of the top of the clamp body. A first clamping block and a second clamping block are installed in the first protruding block and the second protruding block in a buckled mode respectively, and the top of the first clamping block and the top of the second clamping block are both coated with boron nitride coatings. The top of the first clamping block and the top of the second clamping block are coated with the boron nitride coatings, the copper foil is effectively prevented from being adhered to the clamping blocks in the sintering process by means of the characteristics of high temperature resistance, low friction coefficient and good chemical stability of the boron nitride coatings, and it is guaranteed that the sintered copper foil is smoothly separated from the clamp; and meanwhile, the coating and the clamping block structure can be kept stable in a high-temperature environment, and the influence of thermal deformation and thermal expansion difference on the sintering quality of the substrate is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of electronic packaging technology, specifically a sintering fixture. Background Technology

[0002] Currently, there are various types of copper-clad ceramic substrate sintering fixtures on the market. Some traditional fixtures adopt a simple flat plate structure, which supports the copper-clad ceramic substrate by setting several support points on the plate. For example, some fixtures have several raised support blocks evenly distributed on the edge of the plate to support the substrate for sintering.

[0003] During sintering, copper softens or even melts at high temperatures. If it comes into close contact with the fixture over a large area, the atoms can easily diffuse and stick together. The raised points change the contact between the copper and the fixture to point contact, greatly reducing the contact area and lowering the probability of sticking. The raised points lift the copper foil around its perimeter, creating a tiny isolation space between the copper foil and the fixture body. Gases and impurities generated during sintering can be discharged or accumulate in this space, avoiding sticking caused by impurity accumulation. During sintering, the material will generate stress due to thermal expansion and contraction. The raised points can disperse these stresses, preventing the copper foil from being excessively squeezed and adhered to the fixture due to local stress concentration, thereby reducing the risk of sticking.

[0004] However, relying solely on the support of the raised points around the perimeter, the ceramic substrate may wobble or shift during the sintering process due to slight external disturbances or uneven thermal deformation, affecting the sintering quality. Furthermore, after multiple sinterings, the contact points between the raised points and the copper foil are prone to wear due to friction and high-temperature adhesion. Residual copper shavings and other impurities can affect subsequent sintering results and are difficult to clean. Utility Model Content

[0005] To overcome the above-mentioned defects, this utility model provides a sintering fixture, which solves the problems that the ceramic substrate may shake or shift during the sintering process due to slight external disturbance or uneven thermal deformation when supported by only the four raised points, thus affecting the sintering quality. Furthermore, after multiple sinterings, the contact points between the raised points and the copper foil are prone to wear due to friction and high temperature adhesion, and the residual copper shavings and other impurities will affect the subsequent sintering effect and are inconvenient to clean.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sintering fixture, comprising a fixture body, wherein a plurality of first protrusions are fixedly connected in a symmetrical structure at the edge of the top of the fixture body, and a second protrusion is fixedly connected at the center of the top of the fixture body, wherein a first locking block and a second locking block are respectively snapped into the first protrusion and the second protrusion, and the top of the first locking block and the second locking block are coated with a boron nitride coating.

[0007] As a further embodiment of this utility model: the outer side of the clamp body is provided with multiple sets of symmetrical slide rails, and the slide rails are slidably connected with limit rods.

[0008] As a further embodiment of this utility model: the bottom of the fixture body is provided with multiple sets of heat-conducting blocks, and the heat-conducting blocks pass through the bottom of the first protrusion and the second protrusion.

[0009] As a further embodiment of this utility model: the bottom of the fixture body is provided with a slot for use with the heat-conducting block.

[0010] As a further embodiment of this utility model: the first protrusion and the second protrusion are respectively provided with slots for use with the first card block and the second card block.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. The top of the first and second card blocks is coated with boron nitride. Taking advantage of its high temperature resistance, low coefficient of friction and good chemical stability, it effectively prevents the copper foil from sticking to the card blocks during the sintering process, ensuring that the copper foil can be smoothly separated from the fixture after sintering, thus improving the product yield. At the same time, the coating and card block structure can remain stable in a high temperature environment, reducing the impact of thermal deformation and thermal expansion differences on the sintering quality of the substrate.

[0013] 2. The top of the first and second card blocks is coated with boron nitride. Taking advantage of its high temperature resistance, low coefficient of friction and good chemical stability, it effectively prevents the copper foil from sticking to the card blocks during the sintering process, ensuring that the copper foil can be smoothly separated from the fixture after sintering, thus improving the product yield. At the same time, the coating and card block structure can remain stable in a high temperature environment, reducing the impact of thermal deformation and thermal expansion differences on the sintering quality of the substrate.

[0014] 3. The first and second clamping blocks are installed in the clamping slots using snap-fit ​​mechanisms. When the boron nitride coating on the clamping blocks is worn or contaminated with impurities, they can be quickly disassembled and replaced, reducing the overall maintenance cost of the fixture and extending its service life. Attached Figure Description

[0015] Figure 1 This is a first-view schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a second-view schematic diagram of the overall structure of this utility model;

[0017] Figure 3 This is a first-view schematic diagram of the disassembled structure of this utility model;

[0018] Figure 4 This is a second-view schematic diagram of the split structure of this utility model.

[0019] In the figure: 1. Fixture body; 2. First protrusion; 3. First locking block; 4. Second protrusion; 5. Second locking block; 6. Slide rail; 7. Limiting rod; 8. Heat-conducting block; 9. Slot; 10. Slot. Detailed Implementation

[0020] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0021] like Figures 1-4 As shown, this utility model provides a technical solution:

[0022] A sintering fixture includes a fixture body 1. Multiple sets of first protrusions 2 are fixedly connected in a symmetrical structure at the top edge of the fixture body 1. A second protrusion 4 is fixedly connected at the center of the top of the fixture body 1. A first locking block 3 and a second locking block 5 are respectively snapped into the first protrusion 2 and the second protrusion 4. The top of the first locking block 3 and the second locking block 5 are coated with boron nitride coating.

[0023] Specifically, the first locking block 3, coated with boron nitride, is snapped into the first protrusion 2 on the edge of the fixture body 1, and the second locking block 5 is snapped into the second protrusion 4 at the center of the fixture body 1. The copper-clad ceramic substrate is then placed stably on the fixture, with the substrate in contact with the tops of the first locking block 3 and the second locking block 5. The first locking block 3 and the second locking block 5 provide support and positioning for the substrate. The fixture containing the substrate is then placed in equipment such as a sintering furnace, and sintering is performed according to predetermined sintering process parameters. After sintering, once the fixture and the substrate have cooled to a suitable temperature, the boron nitride coating on the first locking block 3 and the second locking block 5 is checked for wear or contamination. If necessary, the locking blocks are cleaned or replaced. The boron nitride coating has high resistance to high temperatures. With its low temperature, low coefficient of friction, and good chemical stability, it can effectively prevent copper from sticking to the clamps during sintering, ensuring smooth separation of the copper foil from the fixture after sintering and improving product yield. The first clamp 3, symmetrically distributed at the edge, and the second clamp 5, located at the center, can support and position the substrate from multiple positions, ensuring the stability of the substrate during sintering and reducing sintering defects caused by displacement. The clamps adopt a snap-on installation method, and can be quickly disassembled and replaced when the boron nitride coating on the clamps is worn or contaminated with impurities, reducing the overall maintenance cost of the fixture and extending the service life of the fixture. The boron nitride coating and the clamp structure can remain stable in the high-temperature sintering environment, reducing the impact of thermal deformation and thermal expansion differences on the sintering quality of the substrate.

[0024] The clamp body 1 has multiple sets of symmetrical slide rails 6 on its outer side, and a limit rod 7 is slidably connected inside the slide rails 6. The clamp body 1 has multiple sets of heat-conducting blocks 8 at its bottom, and the heat-conducting blocks 8 pass through the bottom of the first protrusion 2 and the second protrusion 4. The bottom of the clamp body 1 has a slot 9 for use with the heat-conducting blocks 8. The first protrusion 2 and the second protrusion 4 have slots 10 for use with the first locking block 3 and the second locking block 5, respectively.

[0025] Specifically, multiple sets of symmetrically structured slide rails 6 cooperate with limiting rods 7 to precisely limit the lateral movement of workpieces, such as copper-clad ceramic substrates, placed on the fixture. This ensures the workpiece is fixed in position on the fixture, preventing displacement due to external forces or thermal deformation during sintering, and guaranteeing the consistency and accuracy of sintering. The limiting rods 7 slide within the slide rails 6, allowing for flexible adjustment of the limiting position according to workpieces of different sizes, improving the versatility of the fixture and making it suitable for sintering copper-clad ceramic substrates of various specifications. The heat-conducting block 8 at the bottom of the fixture body 1 passes through the bottom of the first protrusion 2 and the second protrusion 4, enabling rapid and uniform heat conduction to the key parts where the fixture contacts the workpiece, namely the first locking block 3 and the second locking block 5. The fixture is positioned to ensure uniform heating of the workpiece, avoid sintering defects caused by local temperature differences, and improve sintering quality. A slot 9 is opened at the bottom of the fixture body 1 to cooperate with the heat-conducting block 8, so that the heat-conducting block 8 can be firmly embedded. This not only ensures the firmness of the heat-conducting block 8 installation, but also makes the entire fixture structure compact and makes reasonable use of space without adding too much volume. The first protrusion 2 and the second protrusion 4 are provided with slots 10 to cooperate with the first locking block 3 and the second locking block 5, so that the locking block can be quickly and accurately installed into the protrusion. The snap-on installation method is easy to operate. At the same time, the slots 10 can provide a firm fixing effect for the locking block, so that the locking block will not loosen or shift during the sintering process, ensuring the reliability of workpiece support and positioning.

[0026] The working principle of this utility model is as follows:

[0027] First, the first protrusion 2 and the second protrusion 4, which are symmetrically arranged on the top edge of the fixture body 1, are respectively installed by the first card block 3 and the second card block 5 through the card slot 10. When the copper-clad ceramic substrate is placed on the fixture, the substrate contacts the top of the first card block 3 and the second card block 5, and supports and positions the substrate from multiple positions at the edge and center, ensuring that the substrate is stable on the fixture and reducing defects caused by displacement during the sintering process.

[0028] Secondly, the top of the first card block 3 and the second card block 5 are coated with boron nitride. Taking advantage of its high temperature resistance, low coefficient of friction and good chemical stability, it effectively prevents the copper foil from sticking to the card block during the sintering process, ensuring that the copper foil can be smoothly separated from the fixture after sintering, thus improving the product yield. At the same time, the coating and card block structure can remain stable in a high temperature environment, reducing the impact of thermal deformation and thermal expansion differences on the sintering quality of the substrate.

[0029] It is worth mentioning that the slide rails 6 symmetrically arranged on the outer side of the fixture body 1 cooperate with the limiting rods 7 to accurately limit the copper-clad ceramic substrate laterally, preventing it from shifting due to external force or thermal deformation during sintering, ensuring sintering consistency and accuracy. Moreover, the limiting rods 7 can slide within the slide rails 6, and can flexibly adjust the limiting position according to different substrate sizes, improving the versatility of the fixture.

[0030] The heat-conducting block 8 at the bottom of the fixture body 1 passes through the bottom of the first protrusion 2 and the second protrusion 4, and quickly and evenly conducts heat to the first locking block 3 and the second locking block 5 that are in contact with the substrate, ensuring that the substrate is heated evenly, avoiding sintering defects caused by local temperature differences, and improving sintering quality. The heat-conducting block 8 is firmly embedded through the slot 9 at the bottom of the fixture body 1, making the fixture structure compact and reasonable.

[0031] Finally, the first card block 3 and the second card block 5 are installed in the card slot 10 by snap-fit. When the boron nitride coating on the card block is worn or contaminated with impurities, it can be quickly disassembled and replaced, reducing the overall maintenance cost of the fixture and extending the service life of the fixture.

[0032] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A sintering clamp comprising a clamp body (1), characterized in that: The top of the clamp body (1) is fixedly connected with a number of first protrusions (2) in a symmetrical structure at the edge. The top of the clamp body (1) is fixedly connected with a second protrusion (4) at the center. The first protrusion (2) and the second protrusion (4) are respectively fitted with a first locking block (3) and a second locking block (5). The top of the first locking block (3) and the second locking block (5) are coated with boron nitride.

2. A sintering fixture according to claim 1, wherein: The clamp body (1) is provided with multiple sets of symmetrical slide rails (6) on the outside, and a limit rod (7) is slidably connected inside the slide rails (6).

3. A sintering fixture according to claim 2, wherein: The bottom of the clamp body (1) is provided with multiple sets of heat-conducting blocks (8), which pass through the bottom of the first protrusion (2) and the second protrusion (4).

4. A sintering fixture according to claim 3, wherein: The bottom of the fixture body (1) is provided with a slot (9) for use with the heat-conducting block (8).

5. A sintering fixture according to claim 4, characterized in that: The first protrusion (2) and the second protrusion (4) are respectively provided with slots (10) for use with the first card block (3) and the second card block (5).

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