CN113084158A - Forming method of silver powder sinter cake and powder sinter device - Google Patents
Forming method of silver powder sinter cake and powder sinter device Download PDFInfo
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- CN113084158A CN113084158A CN202110341425.9A CN202110341425A CN113084158A CN 113084158 A CN113084158 A CN 113084158A CN 202110341425 A CN202110341425 A CN 202110341425A CN 113084158 A CN113084158 A CN 113084158A
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- silver powder
- box body
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- female die
- male die
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000000843 powder Substances 0.000 title claims abstract description 29
- 238000005245 sintering Methods 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000005485 electric heating Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000004809 Teflon Substances 0.000 claims description 6
- 229920006362 Teflon® Polymers 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 abstract description 20
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000009827 uniform distribution Methods 0.000 abstract description 2
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
Abstract
The invention discloses a method for forming silver powder sinter cakes and a powder sintering device. The forming method of the silver powder sintered block comprises the following steps: adding silver powder into the box body between the male die and the female die; wherein, the thermal expansion rates of the male die and the female die are both smaller than the thermal expansion rate of the box body; pressurizing the male die and the female die until a preset amount of silver powder is in the box body; heating the box body between the male die and the female die until the silver powder in the box body is sintered into silver powder sintered blocks; and removing the box body on the surface of the silver powder sintered block. Compared with the existing metal powder sintering technology, the forming method of the silver powder sintered block adds the box body in the pressing process and the sintering process of the silver powder, the formed shape and the formed density of the silver powder in the pressing process are restrained by the box body, the uniform pressure and heating of the silver powder in the sintering process are met by the heat resistance, the anti-sticking performance and the thermal expansion characteristics of the box body, the complete shape and the uniform distribution of small holes of the silver powder sintered block are ensured, and the silver powder sintered block has larger BET specific surface area and higher structural strength.
Description
Technical Field
The invention relates to the field of powder metallurgy, in particular to a method for forming silver powder sintered blocks. Also relates to a powder sintering device, which is suitable for the forming method of the silver powder sintered block.
Background
In the case of a heat exchanger of an ultra-low temperature apparatus such as a dilution refrigerator, in which a fluid is under an ultra-low temperature condition, thermal resistance of surfaces of a liquid and a solid becomes large, and thus an effect of convective heat transfer becomes poor, it is necessary to secure a good heat transfer effect using a metal sintered compact having a large heat transfer area such as a silver powder sintered compact.
At present, the metal sintered blocks in the dilution refrigerator usually achieve corresponding purposes by increasing the volume of the silver powder sintered blocks in order to ensure the convection heat exchange effect of the dilution refrigerator under the restriction of the process level of the silver powder sintered blocks. Obviously, the increase of silver powder agglomerates also introduces new problems for the application of dilution refrigerators. Therefore, how to consider the characteristics of small volume and large heat exchange area of the silver powder sintered block becomes a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a method for forming silver powder sintered blocks, which can prepare the silver powder sintered blocks with small volume and large BET specific surface area. Another object of the present invention is to provide a powder sintering apparatus to which the above method for forming silver powder agglomerates is applied, for processing silver powder agglomerates having both volume and BET specific surface area.
In order to achieve the above object, the present invention provides a method for forming silver powder agglomerates, comprising:
adding silver powder into the box body between the male die and the female die; wherein the thermal expansion rates of the male die and the female die are both less than the thermal expansion rate of the box body;
pressurizing the male die and the female die until a preset amount of silver powder is in the box body;
heating the box body between the male die and the female die until the silver powder in the box body is sintered into silver powder sintered blocks;
and removing the box body on the surface of the silver powder sintered block.
Preferably, the step of adding silver powder into the box body between the male die and the female die further comprises the following steps:
and anti-sticking coatings are arranged on the inner surface and the outer surface of the box body.
Preferably, the step of adding silver powder into the box body between the male die and the female die further comprises the following steps:
the box body is prepared by Teflon.
Preferably, the step of adding silver powder into the case between the male die and the female die comprises:
silver powder having a particle size of not more than 150nm is added to the inside of the case between the male die and the female die.
Preferably, the step of heating the cartridge comprises:
and opening heating parts distributed next to the groove cavity of the female die.
Preferably, the step of opening the heating portions distributed in the immediate vicinity of the cavity of the female mold specifically includes:
and connecting an electric heating wire which is positioned in the female die and is close to the peripheral side of the groove cavity of the female die.
The invention also provides a powder sintering device which is suitable for the forming method of the silver powder sintered block and comprises a male die, a female die and a box body which is used for being placed in die cavities of the male die and the female die; the box body is a heat-resistant anti-sticking box body for containing silver powder to be sintered; the thermal expansion rates of the male die and the female die are both smaller than the thermal expansion rate of the heat-resistant anti-sticking box body; and a heating body close to the die cavity is arranged in at least one of the male die and the female die.
Preferably, the heating body is arranged in the female die; the heating body surrounds and is close to the groove cavity of the female die.
Preferably, the device further comprises a pressurizing handle and an indicating rod which are arranged between the male die and the female die; the pressurizing handle and the indicating rod are distributed along the mold closing direction; the pressurizing handle is connected with and drives the male die to move relative to the female die; one end of the indicating rod is fixed on the female die, and the other end of the indicating rod is connected with the male die in a sliding mode.
Preferably, the heating body is an electric heating wire; the male die and the female die are copper dies.
Compared with the background art, the forming method of the silver powder sintered block provided by the invention comprises the following steps:
s1: adding silver powder into the box body between the male die and the female die; wherein the thermal expansion rates of the male die and the female die are both less than the thermal expansion rate of the box body;
s2: pressurizing the male die and the female die until a preset amount of silver powder is in the box body;
s3: heating the box body between the male die and the female die until the silver powder in the box body is sintered into silver powder sintered blocks;
s4: and removing the box body on the surface of the silver powder sintered block.
The forming method of the silver powder sintered block mainly comprises two steps of pressing and sintering. Compared with the existing metal powder sintering technology, the method for forming the silver powder sintered block increases the structure of the box body, and accordingly adjusts the specific implementation contents of the pressing and sintering steps.
In the process of pressing the silver powder into the silver powder block, the box body provides a closed cavity for pressing the silver powder into a preset geometric shape, so that quantitative silver powder can be conveniently compressed and formed in a space with a fixed size, and the pressed shape and pressed density of the silver powder block are guaranteed.
In the process of sintering the silver powder blocks into silver powder sintered blocks, the box body can compensate deformation of the female die and the male die caused by temperature fluctuation so as to provide continuous and stable pressure for the silver powder in the box body and ensure that the silver powder in the box body is uniformly pressed and heated, thereby obtaining the silver powder sintered blocks with complete shapes, uniform pore distribution, large BET specific surface area and high structural strength.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a first method for forming sintered silver powder agglomerates according to an embodiment of the present invention;
FIG. 2 is a flow chart of a second method for forming sintered silver powder agglomerates according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a powder sintering device according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line G-G of FIG. 3;
FIG. 5 is a schematic diagram illustrating a partial structure of a powder sintering device according to an embodiment of the present invention;
fig. 6 is a partially enlarged view of fig. 5.
Wherein, the device comprises a male die 1, a female die 2, an indicating rod 3, an electric heating wire 4, a pressurizing rod 5, a pressurizing block 6, a pressurizing plate 7 and an operating handle 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 6, fig. 1 is a flow chart of a first method for forming silver powder sintered cakes according to an embodiment of the present invention; FIG. 2 is a flow chart of a second method for forming sintered silver powder agglomerates according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a powder sintering device according to an embodiment of the present invention; FIG. 4 is a cross-sectional view taken along line G-G of FIG. 3; FIG. 5 is a schematic diagram illustrating a partial structure of a powder sintering device according to an embodiment of the present invention; fig. 6 is a partially enlarged view of fig. 5.
The invention provides a method for forming silver powder sintered blocks, which comprises the following steps:
s1: adding silver powder into the box body between the male die 1 and the female die 2; the thermal expansion rates of the male die 1 and the female die 2 are both smaller than that of the box body;
s2: pressurizing the male die 1 and the female die 2 until silver powder with a preset amount is in the box body;
s3: heating the box body between the male die 1 and the female die 2 until silver powder in the box body forms silver powder sintered blocks;
s4: and removing the box body on the surface of the silver powder sintered block.
The method for forming the silver powder sintered block comprises the steps of firstly utilizing a male die 1, a female die 2 and a box body arranged between the male die 1 and the female die 2 to realize the pressing of silver powder, then sintering the silver powder which is positioned in the box body and is subjected to the pressing forming to form the silver powder sintered block, and finally taking out the box body and removing the box body from the surface of the silver powder sintered block.
Therefore, the forming method of the silver powder sintered block mainly comprises two steps of pressing and sintering. In the pressing process, except that the male die 1 and the female die 2 are used for applying pressure to the silver powder when the die is closed, the box body is also used for providing a closed cavity for pressing the silver powder into a preset geometric shape, so that quantitative silver powder can be conveniently compressed and formed in a space with a fixed size.
In addition, because the thermal expansion rate of the box body is greater than that of the female die 2 and that of the male die 1, the box body can compensate the deformation of the female die 2 and the male die 1 caused by temperature fluctuation in the silver powder sintering process, so that continuous and stable pressure is provided for the silver powder in the box body, and the silver powder in the box body is guaranteed to be uniformly pressed and heated.
Since the box body is heated and sintered along with the male die 1, the female die 2 and the silver powder, and the silver powder is stripped after being sintered into blocks, the box body also has the characteristics of heat resistance and sticking resistance.
Compared with the existing metal powder sintering technology, the forming method of the silver powder sintered block provided by the invention has the advantages that the box body is added in the pressing process and the sintering process of the silver powder, the forming shape and the forming density of the silver powder in the pressing process are restrained by the box body, the uniform heating and pressing of the silver powder in the sintering process are met through the heat resistance, the anti-sticking performance and the thermal expansion performance of the box body, the complete shape of the silver powder sintered block and the uniform distribution of small holes are ensured, and the silver powder sintered block has larger BET specific surface area and higher structural strength, and is suitable for a heat exchanger of a very low temperature project.
The following will further describe the method for forming silver powder agglomerates provided by the present invention with reference to the accompanying drawings and embodiments.
On the basis of the above embodiment, the foregoing step S1 is preceded by: and anti-sticking coatings are arranged on the inner surface and the outer surface of the box body.
The box body is positioned in a die cavity formed by the female die 2 and the male die 1 and is positioned at the periphery of the silver powder in the pressing and sintering processes. In order to meet the anti-sticking characteristic of the box body, the anti-sticking coating is arranged on the surface of the box body to realize the separation of the box body from the die cavity and the separation of the box body from the silver powder.
In addition to providing the anti-sticking coating, the present invention may also directly use a material that is not easily adhered to the silver powder, the female die 2, and the male die 1, and has satisfactory thermal expansibility to form the box body, for example, in step S1, the method further includes: the box body is prepared by Teflon. In other words, the cartridge mentioned in steps S1-S4 of the present invention is specifically a Teflon cartridge.
It should be noted that, if the box body is made of teflon, the female die 2 and the male die 1 should be made of a die having a thermal expansion rate smaller than that of teflon, for example, the female die 2 may be made of copper, and the male die 1 may be made of brass, and the male die 2 may be made of copper.
In order to achieve better technical effects, step S1 specifically includes: silver powder having a particle size of not more than 150nm is added to the case between the male die 1 and the female die 2.
In other words, the method for forming a silver powder agglomerate according to the present invention uses a silver powder having a particle diameter of not more than 150nm for pressing and sintering, and preferably uses silver powder particles in a spherical shape for pressing and sintering.
Further, in the method for forming silver powder sintered compact provided by the present invention, the step of heating the box body includes: the heating sections distributed next to the cavity of the female mold 2 are opened.
In the method for molding the silver powder sintered compact, a heating part is arranged next to the cavity of the female die 2; the groove cavity of the female die 2 is a cavity for containing the box body and the silver powder, and when the female die 2 and the male die 1 are closed, the male die 1 is inserted into the groove cavity of the female die 2 to realize pressurization of the silver powder.
Because the heating part is arranged close to the groove cavity of the female die 2, no matter the target sintering shape of the silver powder is a block with uniform sizes in all directions or a strip extending towards a single direction, the heating part can transmit balanced heat to all directions of the pressed silver powder block through the female die 2, so that the silver powder block is uniformly heated, the deformation of the female die 2, the male die 1 and the box body in all directions generated under the temperature fluctuation is uniform, the silver powder block is uniformly pressed, and finally the silver powder sintering block with complete and stable shape, uniform pore distribution, large BET specific surface area and high strength is formed.
According to a specific principle of the heating part to realize heating, the step of opening the heating part distributed in the groove cavity adjacent to the female mold 2 may specifically include: an electric heating wire 4 which is arranged in the female die 2 and is adjacent to the periphery of the groove cavity of the female die 2 is switched on. The female die 2 and the male die 1 are both copper dies, so that the quick and efficient heat conduction is facilitated when the electric heating wire 4 is electrified, and the sintering efficiency of the silver powder block is improved.
The invention also provides a powder sintering device which is suitable for the forming method of the silver powder sintered block provided by the above embodiments.
The powder sintering device comprises a male die 1, a female die 2 and a box body which is used for being placed in die cavities of the male die 1 and the female die 2; wherein, the interior of at least one of the male die 1 and the female die 2 is provided with a heating body which is close to the die cavity; the box body is a heat-resistant anti-sticking box body used for containing silver powder to be sintered, and the thermal expansion rate of the box body is smaller than that of the male die 1 and that of the female die 2.
In the powder sintering device, a box body is arranged in a male die 1 and a female die 2 and surrounds the periphery of silver powder, and the box body and the silver powder are pressed and sintered together.
The specific geometric shape of the box body can meet the requirement that quantitative silver powder is pressed and molded in a cavity with a specific size, and the molding shape and the molding density of the silver powder are effectively restrained.
The material characteristics of the box body are favorable for compensating the temperature deformation of the powder sintering device, the silver powder blocks are uniformly pressed and heated in the sintering process, the silver powder blocks can be separated from the male die 1, the female die 2 and the silver powder blocks, the silver powder blocks are prevented from being adhered to the male die 1 and the female die 2 under the condition of being pressed and heated, and therefore the complete shape of the sintered silver powder blocks obtained by sintering is guaranteed.
Furthermore, a heating body is arranged in the female die 2, surrounds and is close to the groove cavity of the female die 2, and is used for providing heat for the female die 2 and the silver powder block in the groove cavity to realize sintering.
The heating body can be specifically set as an electric heating wire 4, and correspondingly, the female die 2 and the male die 1 can adopt copper dies with good thermal conductivity.
In addition, the powder sintering machine may further include a pressurizing handle and an indicating rod 3 provided between the male die 1 and the female die 2; wherein, the pressurizing handle and the indicating rod 3 are distributed along the mold closing direction.
The pressure handle is connected with and drives the male die 1 to move relative to the female die 2. The pressurizing handle drives the male die 1 to close the female die 2, and the pressurizing handle drives the male die 1 to move away from the female die 2, so that the die opening is realized. The pressurizing handle can specifically comprise a pressurizing rod 5 and a pressurizing block 6 sleeved on the pressurizing rod 5, the pressurizing block 6 is abutted to one end, far away from the female die 2, of the male die 1, and the pressurizing block 6 can realize the purpose that the female die 2 is far away from and close to the female die 2 through the axial sliding along the pressurizing rod 5.
In the above structure, in order to facilitate control of the sliding distance of the pressurizing block 6 along the axial direction of the pressurizing rod 5, the pressurizing rod 5 may be specifically configured as a threaded rod, and the pressurizing block 6 is engaged with the threaded rod through its internal threaded hole.
Furthermore, the pressure block 6 may also connect the lever and the pressure plate 7. The operating handle is fixed on the pressurizing block 6 at an angle vertical to the pressurizing rod 5, so that an operator can drive the pressurizing block 6 to rotate around the threaded rod through the operating handle. The pressing plate 7 is located between the pressing block 6 and the cavity blocks 2, and can apply pressure to a plurality of cavity blocks 2 at the same time.
As for the indicating rod 3, one end of the indicating rod 3 can be fixed to the female mold 2, and the other end is slidably connected to the male mold 1, for example, a hole for the indicating rod 3 to pass through is formed in the male mold 1. When an operator drives the male die 1 to approach and leave the female die 2 through the pressurizing block 6, the indicating rod 3 is fixed relative to the female die 2, so that the male die 1 generates a displacement along the axial direction of the indicating rod 3 relative to the indicating rod 3, and the displacement is used for calibrating the relative movement distance of the male die 1 and the female die 2.
The powder sintering device can press and sinter the superfine nano-scale silver powder into porous silver powder sintered blocks. The silver powder blocks are uniformly heated under pressure in the sintering process, and the adhesion phenomenon caused by local overheating can not occur, so that the sintered silver powder blocks obtained by sintering are complete and stable in shape, high in strength, difficult to crack, uniform in pore distribution and large in BET specific surface area.
When the silver powder sintered block is applied to heat exchangers of extremely low temperature projects such as dilution refrigerators and the like, the silver powder sintered block achieves good heat exchange performance for soaking liquid with limited size, can obviously improve the heat exchange effect of fluid and metal surfaces at low temperature, and is favorable for the dilution refrigerators to reach milli-K temperature.
When the powder sintering device is used, firstly, a certain amount of silver powder is put into the box body between the male die 1 and the female die 2, and in the process, all the silver powder can be gradually pressed into the box body by utilizing the pressurizing rod 5, the pressurizing block 6 and the male die 1; then the relative positions of the male die 1 and the female die 2 are fixed, and the powder sintering device is integrally placed into a heating furnace or a self-contained heating device of the powder sintering device is started for sintering.
Wherein, when the heating furnace is used for sintering, specific gas can be introduced into the heating furnace. And after sintering, taking out the powder sintering device, taking out the box body in the powder sintering device, and removing the box body at the periphery of the silver powder sintered block.
The method for forming the silver powder agglomerates and the powder sintering apparatus provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for forming silver powder agglomerates, comprising:
adding silver powder into a box body between a male die (1) and a female die (2); wherein the thermal expansion rates of the male die (1) and the female die (2) are both smaller than that of the box body;
pressurizing the male die (1) and the female die (2) until silver powder with a preset amount is in the box body;
heating the box body between the male die (1) and the female die (2) until silver powder in the box body is sintered into silver powder sintered blocks;
and removing the box body on the surface of the silver powder sintered block.
2. The method for forming silver powder agglomerates according to claim 1, wherein the step of adding silver powder into the box body between the male die (1) and the female die (2) is preceded by the steps of:
and anti-sticking coatings are arranged on the inner surface and the outer surface of the box body.
3. The method for forming silver powder agglomerates according to claim 1, wherein the step of adding silver powder into the box body between the male die (1) and the female die (2) is preceded by the steps of:
the box body is prepared by Teflon.
4. The method for forming silver powder sintered compact according to claim 1, wherein the step of adding silver powder into the case body between the male die (1) and the female die (2) comprises:
silver powder with the grain diameter not more than 150nm is added into the box body between the male die (1) and the female die (2).
5. The method for forming silver powder agglomerates according to any of claims 1 to 4, wherein the step of heating the box body between the male die (1) and the female die (2) comprises:
heating parts distributed next to the groove cavities of the female die (2) are opened.
6. The method for forming silver powder agglomerates according to claim 5, wherein said step of opening a heating portion distributed in close proximity to the cavity of said female die (2) comprises in particular:
and (3) connecting an electric heating wire (4) which is positioned in the female die (2) and is closely adjacent to the peripheral side of the groove cavity of the female die (2).
7. A powder sintering apparatus, which is adapted to the method for forming silver powder agglomerates according to any one of claims 1 to 6, comprising a male die (1), a female die (2), and a case body to be placed in cavities of both the male die (1) and the female die (2); the box body is a heat-resistant anti-sticking box body for containing silver powder to be sintered; the thermal expansion rates of the male die (1) and the female die (2) are both smaller than that of the heat-resistant anti-sticking box body; and a heating body close to the die cavity is arranged in at least one of the male die (1) and the female die (2).
8. Powder sinterr according to claim 7, characterized in that the heating body is arranged in the female die (2); the heating body surrounds and is close to the groove cavity of the female die (2).
9. Powder sinterer as claimed in claim 7, characterized in that it further comprises a pressure handle and an indicator rod (3) arranged between the male (1) and female (2) dies; the pressurizing handle and the indicating rod (3) are distributed along the mold closing direction; the pressurizing handle is connected with and drives the male die (1) to move relative to the female die (2); one end of the indicating rod (3) is fixed on the female die (2), and the other end of the indicating rod is connected with the male die (1) in a sliding mode.
10. Powder sinterr according to claim 7, characterized in that the heating body is embodied as an electric heating wire (4); the male die (1) and the female die (2) are copper dies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110341425.9A CN113084158A (en) | 2021-03-30 | 2021-03-30 | Forming method of silver powder sinter cake and powder sinter device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110341425.9A CN113084158A (en) | 2021-03-30 | 2021-03-30 | Forming method of silver powder sinter cake and powder sinter device |
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| CN113084158A true CN113084158A (en) | 2021-07-09 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1050562A (en) * | 1900-01-01 | |||
| US4260582A (en) * | 1979-07-18 | 1981-04-07 | The Charles Stark Draper Laboratory, Inc. | Differential expansion volume compaction |
| FR2541150A1 (en) * | 1983-02-23 | 1984-08-24 | Skf Cie Applic Mecanique | Moulding method and its application to the manufacture of tubes or profiled sections |
| US4883638A (en) * | 1987-05-20 | 1989-11-28 | Enfo Grundlagenforschungs Ag | Method and device for producing a friction or rubbing element |
| JP2003239003A (en) * | 2002-02-15 | 2003-08-27 | Sanyo Special Steel Co Ltd | Method for manufacturing porous metallic sintered compact tube |
| CN205324725U (en) * | 2016-01-07 | 2016-06-22 | 十堰同创传动技术有限公司 | Forming die of bipyramid synchronizer ring frictional layer |
| JP2016168676A (en) * | 2015-03-11 | 2016-09-23 | 日本碍子株式会社 | Jig and molding tool |
| JP2017226872A (en) * | 2016-06-22 | 2017-12-28 | 三菱マテリアル株式会社 | Manufacturing method for cylindrical target, and powder sintering mold used for same manufacturing method |
| CN110920096A (en) * | 2019-10-24 | 2020-03-27 | 天津中德应用技术大学 | Compression molding process of carbon fiber reinforced composite material |
-
2021
- 2021-03-30 CN CN202110341425.9A patent/CN113084158A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1050562A (en) * | 1900-01-01 | |||
| US4260582A (en) * | 1979-07-18 | 1981-04-07 | The Charles Stark Draper Laboratory, Inc. | Differential expansion volume compaction |
| FR2541150A1 (en) * | 1983-02-23 | 1984-08-24 | Skf Cie Applic Mecanique | Moulding method and its application to the manufacture of tubes or profiled sections |
| US4883638A (en) * | 1987-05-20 | 1989-11-28 | Enfo Grundlagenforschungs Ag | Method and device for producing a friction or rubbing element |
| JP2003239003A (en) * | 2002-02-15 | 2003-08-27 | Sanyo Special Steel Co Ltd | Method for manufacturing porous metallic sintered compact tube |
| JP2016168676A (en) * | 2015-03-11 | 2016-09-23 | 日本碍子株式会社 | Jig and molding tool |
| CN205324725U (en) * | 2016-01-07 | 2016-06-22 | 十堰同创传动技术有限公司 | Forming die of bipyramid synchronizer ring frictional layer |
| JP2017226872A (en) * | 2016-06-22 | 2017-12-28 | 三菱マテリアル株式会社 | Manufacturing method for cylindrical target, and powder sintering mold used for same manufacturing method |
| CN110920096A (en) * | 2019-10-24 | 2020-03-27 | 天津中德应用技术大学 | Compression molding process of carbon fiber reinforced composite material |
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