Jig for sintering second surface of DCB substrate and use method of jig

By designing a fixture with long-side bosses and short-side bosses, the problems of unstable placement of traditional fixtures and the problems of bearing blocks falling off are solved, the correct placement and stable support of DCB substrates are achieved, and the sintering yield is improved.

CN120221533APending Publication Date: 2025-06-27SHANGHAI FULLERHUA SEMICON TECH CO LTD
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Patent Information

Application Number
CN202510311051.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-17
Publication Date
2025-06-27

AI Technical Summary

Technical Problem

The traditional ten-point sintering fixture has problems of unstable placement and bearing blocks falling off during the sintering process of the second surface of the DCB substrate, which affects the sintering yield.

Method used

A fixture consisting of long-side bosses and short-side bosses is designed, through which overlapping platforms and limiting bosses are provided to ensure proper placement and stable support of the DCB substrate.

Benefits of technology

The correct placement and stable support of the DCB substrate are achieved, the sintering yield is improved, and the making process of the fixture is simplified, avoiding the problem of bearing block falling off.

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Abstract

The invention discloses a jig for sintering a second surface of a DCB substrate and a use method of the jig. The jig for sintering the second surface of the DCB substrate is characterized in that the jig comprises a substrate, a long-edge boss is arranged on the long-edge side of the substrate, and a short-edge boss is arranged on the short-edge side of the substrate; the length of the long-edge boss is flush with the length of the substrate, and the short-edge boss is located in the center of the short-edge side of the substrate. The long-edge boss is provided with a first lap joint platform used for being in lap joint with the edge of the long-edge side of the DCB substrate and a first limiting protrusion used for limiting the edge of the long-edge side of the DCB substrate. The short-edge boss is provided with a second lap joint platform used for being in lap joint with the edge of the short-edge side of the DCB substrate and a second limiting protrusion used for limiting the edge of the short-edge side of the DCB substrate. Through the integrated jig structure, supporting of sintering of the second face of the DCB substrate is achieved.
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Description

Technical Field

[0001] The present invention relates to the field of DCB substrate manufacturing, specifically a jig. Background Art

[0002] At present, when the second side of a DCB copper-clad ceramic substrate is sintered, as shown in the figure, a ten-point sintering jig is placed on a conveyor belt 3 for sintering. The ten-point sintering jig is used to support the edge of the ceramic plate 11 to prevent the copper foil 12 on the lower side of the ceramic plate from adhering to the backing plate placed below. The current manufacturing method of the ten-point sintering jig is as follows: Ten support blocks 4 are fixed on the backing plate of the ten-point sintering jig using a high-temperature organic glue 5.

[0003] There are quite a few problems in the production and use of traditional ten-point sintering jigs:

[0004] 1) The sintered product is manually placed on the jig. Without a limit, the placement is troublesome and prone to deviation, which will cause the copper foil on the product to adhere to the support block, affecting the sintering yield of the product.

[0005] 2) The production of the sintering jig is troublesome. First, the support blocks are processed, and then they are adhered to the backing plate using a high-temperature organic glue. And the support blocks are prone to falling off at high temperatures, affecting the normal sintering of the product. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, the present invention provides a jig for sintering the second side of a DCB substrate and its usage method to solve at least one of the above technical problems.

[0007] To achieve the above object, the present invention provides a jig for sintering the second side of a DCB substrate, characterized in that it includes a substrate, a long-side boss is provided on the long-side of the substrate, and a short-side boss is provided on the short-side of the substrate;

[0008] The length of the long-side boss is flush with the length of the substrate;

[0009] The short-side boss is located at the center of the short-side of the substrate;

[0010] The long-side boss is provided with a first overlapping platform for overlapping the edge of the long-side of the DCB substrate and a first limiting protrusion for limiting the edge of the long-side of the DCB substrate, and the outside of the first overlapping platform is connected to the first limiting protrusion;

[0011] The short-side boss is provided with a second overlapping platform for overlapping the edge of the short-side of the DCB substrate and a second limiting protrusion for limiting the edge of the short-side of the DCB substrate, and the outside of the second overlapping platform is connected to the second limiting protrusion;

[0012] The top surfaces of the first overlapping platform and the second overlapping platform are flush.

[0013] Through the integrated fixture structure, the present invention realizes the support for sintering the second side of the DCB substrate, realizes the support for the ceramic plate of the DCB substrate, and at the same time realizes the suspension of the copper foil side on the lower side of the ceramic plate.

[0014] Further preferably, the second overlapping platform is a quadrangular frustum with a wider bottom and a narrower top, and one side wall of the quadrangular frustum is flush with the short side of the substrate and flush with the side wall of the second limiting protrusion.

[0015] Further preferably, the left - right direction of the substrate is defined as the short side of the substrate;

[0016] The front - back direction of the substrate is defined as the long side of the substrate;

[0017] The length of the quadrangular frustum in the left - right direction is greater than the length of the quadrangular frustum in the front - back direction.

[0018] Further preferably, the length of the upper surface of the quadrangular frustum in the left - right direction is greater than the length of the second limiting protrusion in the left - right direction;

[0019] The length of the upper surface of the quadrangular frustum in the front - back direction is greater than the length of the second limiting protrusion in the front - back direction.

[0020] Further preferably, two rounded - rectangle holes that are symmetrically arranged in a front - back mirror image are opened at the center of the substrate.

[0021] Further preferably, the inner side of the quadrangular frustum is flush with the edge of the rounded - rectangle hole.

[0022] Further preferably, the two rounded - rectangle holes are separated by a reinforcing rib with a width of 20 mm.

[0023] Further preferably, the length of the substrate is 200 mm and the width is 150 mm.

[0024] Further preferably, the length of the first overlapping platform for overlapping the DCB substrate in the left - right direction is greater than the length of the second overlapping platform for overlapping the DCB substrate in the front - back direction.

[0025] Further preferably, the length of the first overlapping platform for overlapping the DCB substrate in the left - right direction is 1.5 mm;

[0026] The length of the second overlapping platform for overlapping the DCB substrate in the front - back direction is 1 mm.

[0027] Further preferably, the materials of the substrate, the long - side convex platform, and the short - side convex platform are silicon carbide materials;

[0028] The substrate, the long-side boss, and the short-side boss are integrally formed structures.

[0029] A method for using a fixture during sintering of the second side of a DCB substrate, characterized in that a ceramic substrate is supported on the first overlapping platform of the long-side boss and the second overlapping platform of the short-side boss;

[0030] A lower copper foil layer is fixed to the lower side of the ceramic substrate, and an upper copper foil layer is placed on the upper side of the ceramic substrate;

[0031] The lower copper foil layer is suspended above the substrate and does not contact the first overlapping platform and the second overlapping platform;

[0032] The first limiting protrusion and the second limiting protrusion are located outside the ceramic substrate;

[0033] Place the substrate on the conveyor belt of the sintering furnace for the sintering process, and the sintering process sequentially passes through four constant temperature zones;

[0034] The temperatures of the four constant temperature zones are 1086 °C, 1084 °C, 1081 °C, and 1078 °C in sequence.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1) The fixture is designed with a long-side boss and a short-side boss. By relying on the long-side boss and the short-side boss, it ensures that the sintered product is placed correctly and restricts its displacement, improving the sintering yield of the product. At the same time, the product is convenient to place.

[0037] 2) The fixture is integrally manufactured, with high manufacturing efficiency and no falling-off phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the background art;

[0039] Figure 2 It is a top view of the present invention;

[0040] Figure 3 It is a front view of the present invention;

[0041] Figure 4 It is a top view of the present invention with dimension markings;

[0042] Figure 5 It is a front view of the present invention with dimension markings;

[0043] Figure 6 It is a cross-sectional view of the present invention in the use state.

[0044] In the figure: 3 is a conveyor belt, 6 is a long-side boss, 61 is a first overlapping platform, 62 is a first limiting protrusion, 7 is a short-side boss, 71 is a second overlapping platform, 72 is a second limiting protrusion; 8 is a substrate, 81 is a rounded rectangular hole;

[0045] 11 is a ceramic plate, 12 is a copper foil. Specific embodiments

[0046] The present invention will be further described below with reference to the accompanying drawings.

[0047] See Figures 2 to 6 , Specific Embodiment 1: A jig for sintering the second side of a DCB substrate, comprising a substrate 8. A long-side boss 6 is provided on the long-side of the substrate 8, and a short-side boss 7 is provided on the short-side of the substrate 8; the length of the long-side boss 6 is flush with the length of the substrate 8; the short-side boss 7 is located at the center of the short-side of the substrate 8; the long-side boss 6 is provided with a first overlapping platform 61 for overlapping the edge of the long-side of the DCB substrate 8 and a first limiting protrusion 62 for limiting the edge of the long-side of the DCB substrate 8, and the outside of the first overlapping platform 61 is connected to the first limiting protrusion 62; the short-side boss 7 is provided with a second overlapping platform 71 for overlapping the edge of the short-side of the DCB substrate 8 and a second limiting protrusion 72 for limiting the edge of the short-side of the DCB substrate 8, and the outside of the second overlapping platform 71 is connected to the second limiting protrusion 72, and the top surfaces of the first overlapping platform and the second overlapping platform are flush. Through the integrated jig structure of the present invention, the support for sintering the second side of the DCB substrate 8 is realized. While realizing the support for the ceramic plate of the DCB substrate 8, the suspension of the copper foil side on the lower side of the ceramic plate is realized.

[0048] The second overlapping platform 71 is a frustum of a quadrangular pyramid with a wider bottom and a narrower top. One side wall of the frustum of the quadrangular pyramid is flush with the short-side of the substrate 8 and is also flush with the side wall of the second limiting protrusion 72.

[0049] Taking the left-right direction of the substrate 8 as the short-side of the substrate 8; taking the front-back direction of the substrate 8 as the long-side of the substrate 8; the length of the frustum of the quadrangular pyramid in the left-right direction is greater than the length of the frustum of the quadrangular pyramid in the front-back direction.

[0050] The length of the upper surface of the frustum of the quadrangular pyramid in the left-right direction is greater than the length of the second limiting protrusion 72 in the left-right direction; the length of the upper surface of the frustum of the quadrangular pyramid in the front-back direction is greater than the length of the second limiting protrusion 72 in the front-back direction.

[0051] Two rounded rectangular holes 81 that are symmetrically arranged front and back are opened at the center of the substrate 8. The inside of the frustum of the quadrangular pyramid is flush with the edge of the rounded rectangular hole 81. The two rounded rectangular holes are separated by a reinforcing rib with a width k of 20 mm. The rounded radius r of the rounded rectangular hole is 20 mm.

[0052] The length in the left - right direction at the place for lapping the DCB substrate 8 on the first lapping platform 61 is greater than the length in the front - back direction at the place for lapping the DCB substrate 8 on the second lapping platform 71.

[0053] The length f in the left - right direction at the place for lapping the DCB substrate 8 on the first lapping platform 61 is 1.5 mm; the length in the front - back direction at the place for lapping the DCB substrate 8 on the second lapping platform 71 is 1 mm.

[0054] There are two short - side bosses, which are arranged front - to - back.

[0055] The substrate, the long - side boss and the short - side boss are made of silicon carbide material; the substrate, the long - side boss and the short - side boss are of an integrally formed structure. The length a of the substrate 8 is 200 mm, and the width b is 150 mm.

[0056] The height c from the top of the long - side boss to the bottom of the substrate is 18 mm. The height e from the top of the first lapping platform to the bottom of the substrate is 10 mm.

[0057] The height g from the top of the short - side boss to the bottom of the substrate is 15 mm. The height from the top of the second lapping platform to the bottom of the substrate is 10 mm. The length h of the second limiting protrusion in the left - right direction is 5 mm, and the length in the front - back direction is 3.5 mm. The length in the left - right direction of the top surface of the second lapping platform is 7 mm, and the length in the front - back direction of the top surface is i = 4.5 mm. The length in the left - right direction of the bottom surface of the second lapping platform is 30 mm, and the length in the front - back direction of the top surface is j = 14 mm.

[0058] The substrate thickness d is 5 mm.

[0059] During use, place the ceramic plate 11 with the lower copper foil already sintered on the first lapping platform and the second lapping platform. The upper side of the ceramic plate is covered with the copper foil 12 to be sintered, and the substrate is placed on the conveyor belt 3 and enters the sintering furnace.

[0060] A method for using a jig for sintering the second side of a DCB substrate. The first lapping platform of the long - side boss and the second lapping platform of the short - side boss support a ceramic substrate;

[0061] A lower copper foil layer is fixed on the lower side of the ceramic substrate, and an upper copper foil layer is placed on the upper side of the ceramic substrate;

[0062] The lower copper foil layer is suspended above the substrate and does not contact the first lapping platform and the second lapping platform;

[0063] The first limiting protrusion and the second limiting protrusion are located outside the ceramic substrate;

[0064] Place the substrate on the conveyor belt of the sintering furnace for the sintering process. During the sintering process, it passes through four constant-temperature zones in sequence;

[0065] The temperatures of the four constant-temperature zones are 1086°C, 1084°C, 1081°C, and 1078°C in sequence.

[0066]

[0067] When the jig carries the product for sintering, the product passes through three heating zones, four constant-temperature zones, and three cooling zones in sequence; the temperatures of the three heating zones are set at 758°C - 763°C, 853°C - 858°C, and 1033°C - 1038°C respectively; the temperatures of the three cooling zones are set at 1027°C - 1033°C, 972°C - 978°C, and 922°C - 928°C respectively; the conveying speed of the sintering jig is 75 - 85 mm / min.

[0068] Through the implementation of the above invention, combined with the change of the temperature in the constant-temperature zone, it is possible to place the sintered product correctly and limit its displacement, and the sintering yield of the product can be increased by more than 1%.

[0069] The above is only the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fixture for sintering the second surface of a DCB substrate, characterized in that: It comprises a base plate, wherein the long side of the base plate is provided with a long side boss, and the short side of the base plate is provided with a short side boss; The length of the long side boss is flush with the length of the base plate; The short side boss is located at the center of the short side of the substrate; The long side boss is provided with a first overlapping platform for overlapping the edge of the long side of the DCB substrate and a first limiting protrusion for limiting the edge of the long side of the DCB substrate, and the outer side of the first overlapping platform is connected to the first limiting protrusion; The short side boss is provided with a second overlapping platform for overlapping the edge of the short side of the DCB substrate and a second limiting protrusion for limiting the edge of the short side of the DCB substrate, and the outer side of the second overlapping platform is connected to the second limiting protrusion; The top surfaces of the first overlapping platform and the second overlapping platform are flush.

2. The jig for sintering the second surface of a DCB substrate according to claim 1, characterized in that: The second overlapping platform is a quadrangular pyramid that is wider at the bottom and narrower at the top, and one side wall of the quadrangular pyramid is flush with the short side of the substrate and is flush with the side wall of the second limiting protrusion.

3. The jig for sintering the second surface of a DCB substrate according to claim 2, characterized in that: The left-right direction of the substrate is regarded as the short side of the substrate; The front-to-back direction of the substrate is the long side of the substrate; The length of the quadrangular pyramid in the left-right direction is greater than the length of the quadrangular pyramid in the front-back direction.

4. The jig for sintering the second surface of a DCB substrate according to claim 2, characterized in that: The length of the upper surface of the quadrangular pyramid in the left-right direction is greater than the length of the second limiting protrusion in the left-right direction; The length of the upper surface of the quadrangular pyramid in the front-to-back direction is greater than the length of the second limiting protrusion in the front-to-back direction.

5. The jig for sintering the second surface of a DCB substrate according to claim 2, characterized in that: The center of the base plate is provided with two rounded rectangular holes which are arranged in a front-to-back mirror-symmetrical manner.

6. The jig for sintering the second surface of a DCB substrate according to claim 5, characterized in that: The inner side of the quadrangular pyramid is flush with the edge of the rounded rectangular hole.

7. The jig for sintering the second surface of a DCB substrate according to claim 5, characterized in that: The two rounded rectangular holes are separated by a reinforcing rib with a width of 20 mm.

8. The jig for sintering the second surface of a DCB substrate according to claim 1, characterized in that: The length of the first overlapping platform in the left-right direction for overlapping the DCB substrate is greater than the length of the second overlapping platform in the front-back direction for overlapping the DCB substrate.

9. The jig for sintering the second surface of a DCB substrate according to claim 1, characterized in that: The substrate, the long side boss and the short side boss are made of silicon carbide material; The base plate, the long side boss and the short side boss are an integrated structure.

10. The method for using the jig for sintering the second surface of a DCB substrate according to claim 1, characterized in that: The first lap joint platform of the long side boss and the second lap joint platform of the short side boss are supported with a ceramic substrate; A lower copper foil layer is fixed on the lower side of the ceramic substrate, and an upper copper foil layer is placed on the upper side of the ceramic substrate; The lower copper foil layer is suspended above the substrate and does not contact the first bonding platform and the second bonding platform; The first limiting protrusion and the second limiting protrusion are located on the outer side of the ceramic substrate; The substrate is placed on the conveyor belt of the sintering furnace for the sintering process, and passes through four constant temperature zones in sequence during the sintering process; The temperatures of the four constant temperature zones are 1086°C, 1084°C, 1081°C and 1078°C respectively.