CN216065539U - Clamp for manufacturing sintered silver thin pancake - Google Patents
Clamp for manufacturing sintered silver thin pancake Download PDFInfo
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- CN216065539U CN216065539U CN202220314948.4U CN202220314948U CN216065539U CN 216065539 U CN216065539 U CN 216065539U CN 202220314948 U CN202220314948 U CN 202220314948U CN 216065539 U CN216065539 U CN 216065539U
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- jig
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- base
- supporting clamp
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Abstract
A jig for making a sintered silver wafer comprising: the device comprises a clamp base, a forming frame, a pressurizing piston and a supporting clamp, wherein the supporting clamp comprises an upper supporting clamp and a lower supporting clamp; the upper supporting clamp is positioned above the lower supporting clamp; the pressurizing piston, the forming frame and the clamp base are arranged between the upper supporting clamp and the lower supporting clamp from top to bottom; the upper supporting clamp and the lower supporting clamp are fixedly connected through a screw rod. Each structure of the utility model adopts independent design. On one hand, an external hydraulic press applies controllable pressure to the silver powder to ensure the compactness of the silver powder, so that the silver cake sintered at high temperature is very firm; on the other hand, after the silver cake is prepared, the silver cake can be taken out by disassembling the clamp base and the forming frame, so that the integrity of the silver cake is ensured.
Description
Technical Field
The utility model belongs to the technical field of dilution refrigerators, and particularly relates to a clamp for manufacturing a sintered silver thin pancake.
Background
The dilution refrigerator and the manufacturing technology thereof play a great role in the fields of physics, material science, computational science and the like, and most of quantum computation is an ultralow temperature platform based on the dilution refrigerator so far. The most critical technology of the dilution refrigerator is to make a high-efficiency heat exchanger, and the cold helium flowing back in the heat exchanger effectively cools the injected helium to the extremely low temperature.
However, as the temperature decreases, the increase in interfacial thermal resistance (kappa-vista) makes it increasingly difficult to pre-chill a helium (He3/He 4) mixture with refluxing helium. One way to effectively reduce the effects of the thermal pick-up resistance is to increase the thermal contact area of the heat exchanger.
The heat exchanger of the dilution refrigerator consists of a low thermal conductivity shell and a high thermal conductivity sintered wafer. At present, a continuous heat exchanger is mainly adopted in a mainstream dilution refrigerator. The heat exchanger has insufficient heat exchange, complex manufacturing process and high manufacturing cost, and limits the popularization of dilution refrigerators to a certain extent. The novel sintered heat exchanger provides larger surface area, so that the dilution refrigerator can obtain low temperature below 60mK, and the novel sintered heat exchanger is firm, durable and high in cost performance. The sintered wafer can be made of copper or silver powder because copper or silver powder has very large thermal conductivity, large specific surface area and convenience in use. Silver powder is generally used to make sintered wafers in high refrigeration capacity dilution refrigerators, given that silver powder has properties that are somewhat better than copper powder.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide a clamp for manufacturing a sintered silver thin cake.
The utility model adopts the following technical scheme:
a jig for making a sintered silver wafer comprising: the device comprises a clamp base, a forming frame, a pressurizing piston and a supporting clamp, wherein the supporting clamp comprises an upper supporting clamp and a lower supporting clamp; the upper supporting clamp is positioned above the lower supporting clamp; the pressurizing piston, the forming frame and the clamp base are arranged between the upper supporting clamp and the lower supporting clamp from top to bottom; the upper supporting clamp and the lower supporting clamp are fixedly connected through a screw rod.
As a preferable scheme of the present invention, the clamp base is a rectangular parallelepiped structure.
As a preferable scheme of the present invention, four corners of the fixture base are respectively provided with a threaded hole.
As a preferable scheme of the present invention, the two relatively short edges of the clamp base are provided with positioning holes.
In a preferred embodiment of the present invention, the size of the forming frame matches the size of the clamp base.
As a preferable scheme of the present invention, threaded holes are respectively formed at four corners of the molding frame, and correspond to the threaded holes on the fixture base.
As a preferred scheme of the present invention, two relatively short edges of the forming frame are provided with limiting holes corresponding to the positioning holes on the fixture base.
As a preferable scheme of the present invention, a rectangular through hole is formed in the center of the forming frame.
In a preferred embodiment of the present invention, the pressurizing piston has a rectangular parallelepiped structure.
As a preferable aspect of the present invention, the pressurizing piston can be inserted into a rectangular through hole in the mold frame.
As a preferable scheme of the present invention, the clamp base and the forming frame are fixedly connected by a fixing screw passing through a threaded hole on the clamp base and the forming frame.
As a preferred scheme of the present invention, the positioning hole and the limiting hole enable the clamp base and the forming frame not to generate relative displacement through a limiting screw.
As a preferable scheme of the utility model, the upper supporting clamp and the lower supporting clamp are both of cuboid structures, and the side lengths of the upper supporting clamp and the lower supporting clamp are both larger than the side lengths of the clamp base and the corresponding side lengths.
As a preferred scheme of the present invention, the upper support fixture and the lower support fixture are respectively provided with corresponding through holes.
As a preferable aspect of the present invention, the screw rods respectively pass through the through holes of the upper and lower support jigs, and the pressurizing piston, the molding frame, and the jig base are clamped by screws.
Compared with the prior art, the utility model has the beneficial effects that:
the pressurizing piston, the forming frame, the clamp base and the supporting clamp are designed independently. On one hand, the external hydraulic press applies controllable pressure to the silver powder through the pressurizing piston to ensure the compactness of the silver powder, so that the silver cake sintered at high temperature is very firm; on the other hand, after the silver cake is prepared, the silver cake can be taken out by disassembling the clamp base and the forming frame, so that the integrity of the silver cake is ensured. The silver cake prepared by the method has large size, high flatness, good integrity and specific surface area up to 2.2m2And/g, the influence of interface thermal resistance on precooling helium in the dilution refrigerator is effectively reduced.
Drawings
FIG. 1 is an oblique view of a body portion of a jig for making sintered silver wafers of the present invention;
FIG. 2 is a front view of a fixture for making sintered silver wafers of the present invention;
FIG. 3 is a right side view of a fixture for making sintered silver wafers of the present invention;
the device comprises a clamp base 1, a forming frame 2, a pressurizing piston 3, a supporting clamp 4, an upper supporting clamp 5, a lower supporting clamp 6, a screw rod 7, a screw 8, a limiting hole 9 and a fixing screw 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the utility model, and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step on the basis of the spirit of the present invention are within the scope of protection of the present invention.
FIG. 1 is an oblique view of a body portion of a jig for making sintered silver wafers of the present invention; FIG. 2 is a front view of a fixture for making sintered silver wafers of the present invention; fig. 3 is a right side view of a jig for making a sintered silver wafer of the present invention. As shown in the figure, a jig for manufacturing a sintered silver wafer of the present invention includes a jig base 1, a molding frame 2, a pressurizing piston 3, and a supporting jig 4.
The supporting clamp 4 comprises an upper supporting clamp 5 and a lower supporting clamp 6, the upper supporting clamp 5 is located above the lower supporting clamp 6, the pressurizing piston 3, the forming frame 2 and the clamp base 1 are arranged between the upper supporting clamp 5 and the lower supporting clamp 6 from top to bottom, and the upper supporting clamp 5 is fixedly connected with the lower supporting clamp 6 through a screw rod 7.
The clamp base 1 is of a cuboid structure, four corners of the clamp base 1 are respectively provided with a threaded hole, and two relatively short edges of the clamp base 1 are provided with positioning holes.
The size of the forming frame 2 is matched with the size of the clamp base 1, threaded holes are respectively formed in four corners of the forming frame 2 and correspond to the threaded holes in the clamp base 1, and the two relatively short edges in the forming frame 2 are provided with limiting holes 9 and correspond to the positioning holes in the clamp base 1.
The clamp base 1 and the forming frame 2 are fixedly connected through a fixing screw 10 passing through a threaded hole on the clamp base 1 and the forming frame 2.
The positioning holes and the limiting holes 9 enable the clamp base 1 and the forming frame 2 not to generate relative displacement through limiting screws.
The center of the forming frame 2 is provided with a rectangular through hole.
The pressurizing piston 3 is of a cuboid structure, and the pressurizing piston 3 can be embedded into a rectangular through hole in the molding frame 2.
The upper supporting clamp 5 and the lower supporting clamp 6 are both of cuboid structures, and the side lengths of the upper supporting clamp 5 and the lower supporting clamp 6 are both larger than the side lengths of the clamp base 1 corresponding to the clamp base.
The upper support clamp 5 and the lower support clamp 6 are respectively provided with corresponding through holes.
The screw rods 7 respectively penetrate through holes of the upper support clamp 5 and the lower support clamp 6, and the pressurizing piston 3, the forming frame 2 and the clamp base 1 are clamped through screws 8.
The technical solution of the present invention will be illustrated by a specific embodiment of the present invention as follows:
the clamp for manufacturing the sintered silver wafer comprises a clamp base 1, a forming frame 2, a pressurizing piston 3 and a supporting clamp 4, and further needs a chemical balance, a vacuum furnace, a hydraulic machine and a vacuum heating plate.
The supporting clamp 4 is divided into an upper supporting clamp 5 and a lower supporting clamp 6, the pressurizing piston 3, the forming frame 2 and the clamp base 1 are arranged between the upper supporting clamp 5 and the lower supporting clamp 6 from top to bottom, and the upper supporting clamp 5 and the lower supporting clamp 6 are fixedly connected through a screw 7.
The fixture base 1 is made of copper with high heat conductivity, is in a cuboid shape, is provided with threaded holes at four corners, and is provided with a positioning hole in the middle of the short side length, so that the fixture base and the forming frame are prevented from being dislocated in the silver powder pressing process. The jig base 1 provides a supporting force for the silver powder in the process of being pressurized.
The molding frame 2 and the clamp base 1 are made of the same material and made of high-thermal-conductivity copper; the forming frame 2 is provided with a rectangular through hole in the center; the size of the forming frame 2 is consistent with that of the clamp base 1, and the threaded holes and the limiting holes 9 on the forming frame correspond to the clamp base 1 one to one.
The pressurizing piston 3 is in a cuboid shape, and the bottom of the pressurizing piston 3 can be embedded into the forming frame 2. The silver powder is pressurized by the hydraulic press through a pressurizing piston 3, and the pressurizing piston 3 is made of high-heat-conductivity copper.
Before pressing the silver powder, the weighed silver powder needs to be subjected to primary sintering by using a vacuum furnace to remove water vapor and an oxide layer in the silver powder. And after the silver powder is filled, the fixed clamp base 1 and the forming frame 2 are placed on the pressurizing piston 3 and then are placed under a hydraulic press together to apply pressure to the pressurizing piston 3, specifically, the magnitude of the applied pressure is between 1 and 50 MPa.
To maintain continuous pressure on the silver wafer, the pressurizing piston 3, the molding frame 2, and the jig base 1 are placed between the upper and lower supporting jigs 5 and 6, and the screw 7 is passed through the through-holes of the upper and lower supporting jigs 5 and 6 and fastened using the screw 8.
The whole clamp set formed by the clamp base 1, the forming frame 2, the pressurizing piston 3 and the supporting clamp 4 is placed in a vacuum heating plate to carry out secondary sintering at the temperature of less than 400 ℃ for not more than 5 hours. Inert gas is filled in the vacuum heating plate for protection, so that the silver thin cake is prevented from being oxidized.
Before making the sintered silver thin pancake, firstly weighing silver powder for making the sintered silver thin pancake through a chemical balance, and then placing the weighed silver powder in a vacuum furnace for primary sintering to remove water vapor and an oxide layer in the silver powder; and secondly, pouring the silver powder subjected to primary sintering into the forming frame 2, pressurizing the pressurizing piston 3 to 1-50MPa through a hydraulic press, and screwing down a fixing screw on the forming frame 2. The fixture base 1, the forming frame 2 and the pressurizing piston 3 are integrally placed in a supporting fixture 4, and the pressure applied to the silver wafer is maintained by fixing a screw on the supporting fixture 4. Finally, the whole device is placed on a vacuum heating plate for secondary sintering, the sintering temperature is less than 400 ℃, and the sintering time is not more than 5 hours. After sintering, the silver sintered thin wafer is naturally cooled, and the firm silver thin wafer with large size and large specific surface area can be obtained. The heating temperature and pressure are strictly controlled throughout the preparation process, since too little pressure results in the sintered silver wafer being too brittle, while too much pressure results in too little specific surface area; although the high temperature makes the silver wafer firm, the high temperature causes the specific surface area of the silver wafer to be greatly reduced.
Compared with the prior art, the utility model has the beneficial effects that:
the pressurizing piston, the forming frame, the clamp base and the supporting clamp are designed independently. On one hand, the external hydraulic press applies controllable pressure to the silver powder through the pressurizing piston to ensure the compactness of the silver powder, so that the silver cake sintered at high temperature is very firm; on the other hand, after the silver cake is prepared, the silver cake can be taken out by disassembling the clamp base and the forming frame, so that the integrity of the silver cake is ensured. The silver cake prepared by the method has large size, high flatness, good integrity and specific surface area up to 2.2m2And/g, the influence of interface thermal resistance on precooling helium in the dilution refrigerator is effectively reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (10)
1. A jig for making a sintered silver wafer comprising: anchor clamps base (1), forming frame (2), pressurization piston (3) and support fixture (4), its characterized in that:
the supporting clamp (4) comprises an upper supporting clamp (5) and a lower supporting clamp (6);
the upper supporting clamp (5) is positioned above the lower supporting clamp (6);
the pressurizing piston (3), the forming frame (2) and the clamp base (1) are arranged between the upper supporting clamp (5) and the lower supporting clamp (6) from top to bottom;
the upper supporting clamp (5) is fixedly connected with the lower supporting clamp (6) through a screw (7).
2. The jig for making sintered silver wafers as claimed in claim 1, wherein:
the clamp base (1) is of a cuboid structure;
threaded holes are respectively formed in four corners of the clamp base (1);
positioning holes are formed in two relatively short edges of the clamp base (1).
3. The jig for making sintered silver wafers as claimed in claim 2, wherein:
the size of the forming frame (2) is matched with that of the clamp base (1);
threaded holes are respectively formed in four corners of the forming frame (2) and correspond to the threaded holes in the clamp base (1);
and two relatively short edges in the forming frame (2) are provided with limiting holes (9) corresponding to the positioning holes on the clamp base (1).
4. A jig for making sintered silver wafers as claimed in claim 3, wherein:
the center of the forming frame (2) is provided with a rectangular through hole.
5. The jig for making sintered silver wafers as claimed in claim 4, wherein:
the pressurizing piston (3) is of a cuboid structure;
the pressurizing piston (3) can be embedded into a rectangular through hole on the molding frame (2).
6. The jig for making sintered silver wafers as claimed in claim 4, wherein:
the fixture base (1) is fixedly connected with the forming frame (2) through a fixing screw (10) penetrating through threaded holes in the fixture base (1) and the forming frame (2).
7. The jig for making sintered silver wafers as claimed in claim 4, wherein:
the positioning holes and the limiting holes (9) enable the clamp base (1) and the forming frame (2) not to generate relative displacement through limiting screws.
8. The jig for making sintered silver wafers as claimed in claim 1, wherein:
go up supporting jig (5) and lower supporting jig (6) and be the cuboid structure, just the length of a side of going up supporting jig (5) and lower supporting jig (6) all is greater than anchor clamps base (1) rather than the length of a side that corresponds.
9. The jig for making sintered silver wafers as claimed in claim 8, wherein:
and the upper supporting clamp (5) and the lower supporting clamp (6) are respectively provided with corresponding through holes.
10. The jig for making sintered silver wafers as claimed in claim 9, wherein:
the screw rods (7) respectively penetrate through holes of the upper supporting clamp (5) and the lower supporting clamp (6), and the pressurizing piston (3), the forming frame (2) and the clamp base (1) are clamped tightly through screws (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220314948.4U CN216065539U (en) | 2022-02-17 | 2022-02-17 | Clamp for manufacturing sintered silver thin pancake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220314948.4U CN216065539U (en) | 2022-02-17 | 2022-02-17 | Clamp for manufacturing sintered silver thin pancake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216065539U true CN216065539U (en) | 2022-03-18 |
Family
ID=80662453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220314948.4U Active CN216065539U (en) | 2022-02-17 | 2022-02-17 | Clamp for manufacturing sintered silver thin pancake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216065539U (en) |
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2022
- 2022-02-17 CN CN202220314948.4U patent/CN216065539U/en active Active
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