Double-sided synchronous sintering jig, sintering method and heat exchanger

Abstract

The invention relates to the technical field of dilution refrigeration equipment, and provides a double-sided synchronous sintering jig which comprises two supporting blocks arranged in a butt joint mode and used for clamping and fixing a base plate. The supporting block is further provided with a filling hole used for placing sintering powder on the base plate. The two pressure head pieces are respectively arranged on one side of one supporting block; the pressure head piece comprises a pressure plate and a pressure block fixedly arranged on the pressure plate; the pressing block is movably matched with the filling hole, and the sections of the pressing block and the filling hole are matched in shape; the pressing blocks of the two pressing head pieces can press sintering powder on the base plate from the two sides respectively. Therefore, the substrate is clamped between the two supporting blocks, powder can be placed on the two sides of the substrate, and sintering layers are synchronously formed on the two sides of the substrate after sintering. The structure is simple, and a sintering layer is uniform and compact. The invention further provides a sintering method based on the sintering jig and a heat exchanger.

Description

Technical Field

[0001] The invention belongs to the technical field of dilution refrigeration equipment, and in particular relates to a double-sided synchronous sintering fixture, a sintering method and a heat exchanger. Background Art

[0002] When the fluid inside the ultra-low temperature equipment is under ultra-low temperature conditions, the thermal resistance between the liquid and the solid surface becomes very large. Therefore, the heat exchanger needs to have a large heat exchange area and good heat exchange performance. At present, the structure of the heat exchanger is usually sintered with silver powder layers on both the upper and lower surfaces of the substrate.

[0003] To achieve this structure, the silver powder needs to be stably and evenly laid on both sides of the substrate before sintering so as to form a sintered layer after sintering. However, there is currently a lack of a fixture to fix the silver powder layer on the substrate, making it difficult to form a sintered layer on the upper and lower surfaces of the substrate.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the present invention mainly provides a double-sided synchronous sintering fixture to solve the technical problem of synchronously forming sintered layers on the upper and lower surfaces of a substrate.

[0006] In order to solve the above problems, the present invention provides a double-sided synchronous sintering fixture, comprising:

[0007] Two butt-jointed support blocks are used to clamp and fix the substrate; the support blocks are also provided with a filling hole for placing sintering powder on the substrate;

[0008] Two pressing head parts are respectively arranged on one side of a supporting block; the pressing head part comprises a pressing plate and a pressing block fixed on the pressing plate; the pressing block is movably matched with the filling hole, and the cross-sectional shapes of the two are adapted;

[0009] The pressing blocks of the two pressing head members can press the sintering powder onto the substrate from both sides respectively.

[0010] According to the double-sided synchronous sintering jig of the present invention, the docking positions of the two support blocks are provided with positioning grooves for placing the substrate; the positioning grooves are configured such that when the substrate is placed in the positioning grooves, the predetermined sintering layer area on the substrate coincides with the edge of the filling hole.

[0011] According to the double-sided synchronous sintering jig of the present invention, the edge shape of the positioning groove is adapted to the shape of the edge of the substrate.

[0012] According to the double-sided synchronous sintering jig of the present invention, the positioning groove is arranged on one of the supporting blocks, and the thickness of the positioning groove is not greater than the thickness of the substrate.

[0013] According to the double-sided synchronous sintering jig of the present invention, a cushion block is movably arranged in the filler hole.

[0014] According to the double-sided synchronous sintering jig of the present invention, the material of the cushion block is polytetrafluoroethylene.

[0015] A sintering method based on the sintering jig comprises the following steps:

[0016] S1, clamping and fixing the substrate between two supporting blocks, and fixing the two supporting blocks;

[0017] S2, placing the two fixed support blocks horizontally, and filling the sintering powder into the filling hole of the upper support block;

[0018] S3, pressing the pressing head into the filler hole of the supporting block located above; pressing the sintered powder flat on the substrate;

[0019] S4, turn the pressing head and the two supporting blocks 180 degrees as a whole, and repeat steps S2 and S3;

[0020] S5, sending the entire jig into a sintering device for sintering, and forming sintered layers on both sides of the substrate at the same time.

[0021] According to the sintering method of the present invention, the sintering powder is silver powder.

[0022] A heat exchanger comprises a substrate, wherein the upper and lower surfaces of the substrate both have sintered layers formed by the sintering method.

[0023] According to the heat exchanger of the present invention, at least one surface of the substrate has a groove structure; and the sintered layer is formed in the groove structure.

[0024] In summary, the double-sided synchronous sintering jig of the present invention can place powder from both sides of the substrate by clamping the substrate between two support blocks, and synchronously form sintered layers on both sides of the substrate after sintering. The structure is simple, and the sintered layer is uniform and dense. The present invention also provides a sintering method and a heat exchanger based on the sintering jig. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the assembly structure of the double-sided synchronous sintering jig of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the sintering fixture;

[0027] Figure 3 It is a schematic diagram of the explosion structure of the double-sided synchronous sintering fixture of the present invention;

[0028] Figure 4It is a structural schematic diagram of an embodiment of a material discharge block of the present invention;

[0029] Figure 5 is a schematic structural diagram of an embodiment of a substrate of the present invention;

[0030] In the figure: 1-pressing plate, 11-pressing block, 12-bolt hole; 2-supporting block, 21-fixing hole, 22-filling hole, 23-positioning groove; 3-cushion block, 4-base plate, 41-groove structure. DETAILED DESCRIPTION

[0031] See also Figure 1-3 The present invention provides a double-sided synchronous sintering jig, comprising:

[0032] The two butt-jointed support blocks 2 are used to clamp and fix the substrate 4; the support blocks 2 are also provided with a filling hole 22 for placing sintering powder on the substrate 4;

[0033] Two pressing head parts are respectively arranged on one side of a supporting block 2; the pressing head part comprises a pressing plate 1 and a pressing block 11 fixed on the pressing plate 1; the pressing block 11 is movably matched with the filling hole 22, and the cross-sectional shapes of the two are adapted;

[0034] The pressing blocks 11 of the two pressing head members press the sintering powder onto the substrate 4 from both sides respectively, and after sintering, sintering layers are simultaneously formed on the upper and lower surfaces of the substrate 4 .

[0035] The cross-sectional shape of the filling hole 22 of the present invention is consistent with the shape of the sintered layer on the substrate 4; it can be adaptively designed according to the shape of the sintered layer of the substrate 4, such as the cross-sectional shape can be rectangular, circular, or multi-shaped.

[0036] See also Figure 4 As an embodiment, a positioning groove 23 for placing the substrate 4 is provided at the docking position of the two support blocks 2; the positioning groove 23 is configured as follows: the substrate 4 is embedded and placed in the positioning groove 23, and the predetermined sintering layer area on the substrate 4 coincides with the edge of the filling hole 22; after the sintering powder is placed, it can be completely covered and laid in the predetermined sintering layer area, and the position of the sintered layer formed after sintering is consistent with the designed position.

[0037] Furthermore, the edge shape of the positioning groove 23 is adapted to the edge shape of the substrate 4; after the substrate 4 is placed in, no movement will occur.

[0038] As a preferred solution, the positioning groove 23 of the present invention is arranged on one of the support blocks 2, and the thickness of the positioning groove 23 is the same as or slightly smaller than the thickness of the substrate 4; after the two support blocks 2 are clamped, the substrate 4 can be firmly fixed.

[0039] As an embodiment, a plurality of fixing holes 21 are provided on the support block 2; after the two support blocks 2 clamp the base plate 4, pins or bolts can be used to penetrate the fixing holes 21 to fix the two support blocks 2 together.

[0040] As an embodiment, the pressing plate 1 and the supporting block 2 are both provided with bolt holes 12 for passing bolts; after the assembly is completed, the fixture is fixed as a whole by bolts to facilitate transportation and movement.

[0041] As an embodiment, a cushion block 3 is movably arranged in the filling hole 22; after the sintering powder is filled, the cushion block 3 is first pressed in to flatten and compact the powder; and then the pressure head is pressed in;

[0042] Preferably, the material of the cushion block 3 is polytetrafluoroethylene; after the pressure head is pressurized, the cushion block 3 can extend to the periphery and cling to the inner wall of the filling hole 22, thereby improving the sealing performance and preventing the powder from being squeezed out of the gap. During the sintering process, the cushion block 3 expands due to heat, which can generate pressure on the powder layer and ensure the density of the sintered layer.

[0043] The double-sided synchronous sintering jig of the present invention can place powder from both sides of the substrate 4 by clamping the substrate 4 between the two support blocks 2, and after sintering, sintered layers are synchronously formed on both sides of the substrate 4. The structure is simple and the sintered layer is uniform.

[0044] The present invention also provides a sintering method based on the sintering jig, comprising the following steps:

[0045] S1, clamp and fix the substrate 4 between the two support blocks 2, and fix the two support blocks 2;

[0046] S2, placing the two fixed support blocks 2 horizontally, and filling the sintering powder into the filling hole 22 of the upper support block 2;

[0047] Preferably, the sintering powder is silver powder, which has good thermal conductivity.

[0048] S3, pressing the pressing head into the filling hole 22 of the upper support block 2 to flatten the sintered powder on the substrate 4;

[0049] Optionally, after the pressure head is pressed in, it is removed to measure the thickness of the powder layer. If the thickness is less than the predetermined thickness, powder can be added until the thickness reaches the standard.

[0050] S4, turn the pressing head and the two supporting blocks 2 180 degrees, and repeat steps S2 and S3;

[0051] S5, sending the entire jig into a sintering device for sintering, and forming sintered layers on both sides of the substrate 4 at the same time;

[0052] See also Figure 5The present invention further provides a heat exchanger, comprising a substrate 4, wherein both the upper and lower surfaces of the substrate 4 have sintered layers formed by the sintering method;

[0053] As an embodiment, at least one surface of the substrate 4 has a groove structure 41; the sintered layer is formed in the groove structure 41; relative to the substrate body, the thickness of the groove structure 41 is smaller, which reduces the distance between the two sintered layers and improves the thermal conductivity effect.

[0054] In summary, the present invention provides a double-sided synchronous sintering jig, which can place powder from both sides of the substrate by clamping the substrate between two support blocks, and synchronously form sintered layers on both sides of the substrate after sintering. The structure is simple, and the sintered layer is uniform and dense. The present invention also provides a sintering method and a heat exchanger based on the sintering jig.

[0055] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A double-sided synchronous sintering fixture, characterized in that: include: Two butt-jointed support blocks are used to clamp and fix the substrate; the support blocks are also provided with a filling hole for placing sintering powder on the substrate; Two pressing head parts are respectively arranged on one side of a supporting block; the pressing head part comprises a pressing plate and a pressing block fixed on the pressing plate; the pressing block is movably matched with the filling hole, and the cross-sectional shapes of the two are adapted; The pressing blocks of the two pressing head members can press the sintering powder onto the substrate from both sides respectively.

2. The double-sided synchronous sintering jig according to claim 1, characterized in that: A positioning groove for placing a substrate is provided at the butt joint of the two support blocks; the positioning groove is configured such that when the substrate is placed in the positioning groove, a predetermined sintering layer area on the substrate coincides with an edge of the filler hole.

3. The double-sided synchronous sintering jig according to claim 2, characterized in that: The edge shape of the positioning groove is adapted to the shape of the edge of the substrate.

4. The double-sided synchronous sintering jig according to claim 2, characterized in that: The positioning groove is arranged on one of the supporting blocks, and the thickness of the positioning groove is not greater than the thickness of the substrate.

5. The double-sided synchronous sintering jig according to claim 1, characterized in that: A cushion block is also movably arranged in the filling hole.

6. The double-sided synchronous sintering jig according to claim 5, characterized in that: The material of the cushion block is polytetrafluoroethylene.

7. A sintering method based on the sintering jig according to any one of claims 1 to 6, characterized in that: The steps include: S1, clamping and fixing the substrate between two supporting blocks, and fixing the two supporting blocks; S2, placing the two fixed support blocks horizontally, and filling the sintering powder into the filling hole of the upper support block; S3, pressing the pressing head into the filler hole of the supporting block located above; pressing the sintered powder flat on the substrate; S4, turn the pressing head and the two supporting blocks 180 degrees as a whole, and repeat steps S2 and S3; S5, sending the entire jig into a sintering device for sintering, and forming sintered layers on both sides of the substrate at the same time.

8. The sintering method according to claim 7, characterized in that: The sintering powder is silver powder.

9. A heat exchanger, characterized in that: The invention comprises a substrate, wherein both the upper and lower surfaces of the substrate have sintered layers formed by the sintering method according to claim 7.

10. The heat exchanger according to claim 9, characterized in that At least one surface of the substrate has a groove structure; the sintered layer is formed in the groove structure.

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