CN115770692A - Vacuum pressure impregnation die and method - Google Patents
Vacuum pressure impregnation die and method Download PDFInfo
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- CN115770692A CN115770692A CN202211536211.8A CN202211536211A CN115770692A CN 115770692 A CN115770692 A CN 115770692A CN 202211536211 A CN202211536211 A CN 202211536211A CN 115770692 A CN115770692 A CN 115770692A
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Abstract
The invention provides a vacuum pressure impregnation die and a method, and belongs to the technical field of vacuum pressure impregnation. The invention relates to a vacuum pressure impregnation die, which comprises a bottom plate, a pressurizing tank body, a pressurizing plate, a pressurizing rod, an upper cover plate, a threaded sleeve and a positioning plate; the bottom plate is fixedly connected with the pressurizing tank body, and the pressurizing tank body is provided with a vacuum port and a slurry port; when the sample to be impregnated is subjected to pre-vacuum pumping, the positioning plate is fixed with the pressurizing plate, and the pressurizing plate is clamped at the upper end of the pressurizing tank body; after the impregnation sample is subjected to pre-vacuumizing, the positioning plate is detached, the pressurizing plate and the pressurizing rod are fixed, the upper cover plate and the pressurizing tank body are fixed, the pressurizing rod penetrates through the upper cover plate and is in threaded connection with the threaded sleeve, the threaded sleeve is used for guiding the pressurizing rod, and the inside of the tank body is a closed space after assembly. According to the vacuum pressure impregnation method, the pressure is applied to the die through the pressure rod by using the pressure machine, so that the compression by using compressed air or inert gas is avoided, the cost is reduced, and the vacuum pressure impregnation method is suitable for batch production.
Description
Technical Field
The invention belongs to the technical field of vacuum pressure impregnation, and particularly relates to a vacuum pressure impregnation mold and a method.
Background
The fiber reinforced silicon carbide ceramic matrix composite has the advantages of high strength, high modulus, high thermal conductivity, low thermal expansion coefficient, good fracture toughness and the like, and is widely applied to the fields of aerospace, nuclear energy, automobiles, chemical industry and the like.
Slurry impregnation and precursor impregnation are one of the commonly used methods for preparing fiber-reinforced silicon carbide ceramic matrix composites. The atmospheric pressure impregnation method is limited by factors such as viscosity of the slurry and the ceramic precursor, and wettability with the fiber preform, and it is difficult to sufficiently impregnate the inside of the fiber preform. And the method of vacuum pressure impregnation can realize the full impregnation of the fiber preform by the slurry or the ceramic precursor.
The vacuum pressure impregnation principle is that the workpiece is pre-vacuumized and then filled with the impregnant, and a certain pressure is applied to fully impregnate the impregnant into the pores inside the workpiece, so that the impregnation process is completed. Common vacuum pressure impregnation equipment consists of multiple parts, and is pressurized by compressed air or inert gas. However, the method has high requirements on equipment, the equipment is complex, and the investment cost is high; the impregnant needs to pass through a long impregnant pipeline, so that the impregnant is easy to waste; when the impregnant is changed, the impregnation pipeline, the impregnation tank, the return pipeline and the like need to be cleaned, and the equipment is only suitable for the batch production of products and is not suitable for the development and test of small and medium-sized samples due to the above factors.
Disclosure of Invention
Therefore, the invention provides a vacuum pressure impregnation die aiming at the problems of the existing vacuum pressure impregnation equipment, is used for realizing vacuum pressure impregnation of small and medium-sized samples, and also provides a vacuum pressure impregnation method.
In order to achieve the aim, the invention provides a vacuum pressure impregnation die, which comprises a bottom plate, a pressurizing tank body, a pressurizing plate, a pressurizing rod, an upper cover plate, a threaded sleeve and a positioning plate, wherein the bottom plate is provided with a bottom plate;
the bottom plate is fixedly connected with the pressurizing tank body and used for placing a sample to be impregnated; the pressure tank body is provided with a vacuum port and a slurry port, the vacuum port is connected with a vacuum pump through a rubber pipe, and the slurry port is connected with a controllable impregnant pipeline with a switch;
the positioning plate is larger than the pressurizing tank body, and when the sample to be impregnated is subjected to pre-vacuum pumping, the positioning plate is fixed with the pressurizing plate and clamps the pressurizing plate at the upper end of the pressurizing tank body, so that the pressurizing plate is prevented from moving downwards due to the pressure difference between the inside and the outside of the tank body in the process;
after the impregnation sample is subjected to pre-vacuumizing, the positioning plate is detached, the pressurizing plate is fixed with the pressurizing rod, the upper cover plate is fixed with the pressurizing tank body, the pressurizing rod penetrates through the upper cover plate to be in threaded connection with the threaded sleeve, the threaded sleeve is used for guiding the pressurizing rod, and a closed space is formed inside the tank body after assembly.
Preferably, the screw threads of the pressurizing plate and the pressurizing rod are respectively provided with a sealing ring, and a sealing gasket is respectively arranged between the pressurizing tank body and the bottom plate and the upper cover plate.
Preferably, all sealing rings and sealing gaskets are made of fluorine rubber.
Preferably, the pressurizing tank body is fixedly connected with the bottom plate and the upper cover plate through countersunk screws respectively, the pressurizing plate is fixedly connected with the positioning plate through countersunk screws, and the pressurizing plate is fixedly connected with the pressurizing rod through countersunk screws.
Preferably, the position of the vacuum port is higher than that of the slurry port, so that the slurry is prevented from being pumped into the vacuum pipeline in the vacuumizing process.
Preferably, the upper cover plate and the threaded sleeve are made of polytetrafluoroethylene or nylon independently.
Preferably, the material of the bottom plate, the pressurizing tank body and the pressurizing plate is independently selected from 304 or 316 stainless steel.
Preferably, the material of the pressure rod and the positioning plate is No. 45 steel quenching treatment.
The invention also provides a method for carrying out vacuum pressure impregnation by adopting the mould, which comprises the following steps:
fixedly connecting the bottom plate with the pressurizing tank body, fixedly connecting the pressurizing plate with the positioning plate, placing the pressurizing plate in the pressurizing tank body after placing a sample to be impregnated in the tank body, connecting the vacuum port with a vacuum pump through a rubber tube, and connecting the slurry port with a controllable impregnant pipeline with a switch;
controlling the impregnant pipeline to be in a closed state, opening a vacuum pump, performing pre-vacuumizing treatment on a sample to be impregnated, and closing the vacuum pump after completely vacuumizing gas remained in pores in the sample to be impregnated;
controlling the impregnant pipeline to be in an open state, so that the impregnant enters the tank body under the action of atmospheric pressure, and controlling the impregnant pipeline to be in a closed state after the impregnant in the tank body reaches a certain amount; controlling the liquid level of the impregnant in the tank body to be lower than the position of the slurry port;
the positioning plate is disassembled, and the pressurizing rod, the upper cover plate and the threaded sleeve are connected in sequence;
opening a vacuum pump, vacuumizing the interior of the tank body, and then closing the vacuum pump;
and (3) placing the mould under a press machine, enabling the press machine to be in contact with the pressurizing rod, opening the press machine, and applying pressure to the mould to realize a vacuum pressure impregnation forming process for the sample.
Preferably, quantitative pressure impregnation of the sample is realized by controlling the pressure applied to the die by the press machine so as to control the pressure of vacuum impregnation in the tank body; the pressure of vacuum impregnation in the tank body is calculated by the indication of a pressure gauge on the press machine.
The invention adopts the technical scheme that the method has the advantages that:
the invention relates to a vacuum pressure impregnation die, which comprises a bottom plate, a pressurization tank body, a pressurization plate, a pressurization rod, an upper cover plate, a threaded sleeve and a positioning plate, wherein the liquid level of an impregnant is directly pressurized through the pressurization plate, and the impregnant is fully impregnated into pores in a sample to be impregnated by utilizing the pressure of a liquid impregnant; the press machine applies pressure to the die through the pressure rod, the die is simple, the compression by using compressed air or inert gas is avoided, and the equipment cost is reduced; the mould can be designed according to the common size of the sample, and the waste of the impregnant is avoided. The method for carrying out vacuum pressure impregnation on the vacuum pressure impregnation die can realize the switching of the impregnant by replacing the impregnant pipeline or adopting the disposable impregnant pipeline, has wide applicability and is suitable for batch production.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the mounting of a positioning plate in a vacuum pressure impregnation die according to the present invention;
FIG. 2 is a schematic view of the installation of a compression bar in the vacuum pressure impregnation die of the present invention;
FIG. 3 is a schematic representation of a carbon fiber-reinforced silicon carbide preform obtained after impregnation with the silicon carbide slurry in example 1 of the present invention;
description of the drawings: 1-a bottom plate; 2-pressurizing the tank body; 3-a compression plate; 4-a pressure bar; 5-upper cover plate; 6-threaded sleeve; 7-a sealing ring; 8-a sealing gasket; 9-sealing ring; 10-a sealing gasket; 11-positioning plate.
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.
As shown in fig. 1 and 2, the present invention provides a vacuum pressure impregnation mold, which comprises a bottom plate 1, a pressurized tank 2, a pressurized plate 3, a pressurized rod 4, an upper cover plate 5, a threaded sleeve 6 and a positioning plate 11;
the bottom plate 1 is fixedly connected with the pressurizing tank body 2 and is used for placing a sample to be impregnated; a vacuum port and a slurry port are arranged on the pressurizing tank body 2, the vacuum port is connected with a vacuum pump through a rubber pipe, and the slurry port is connected with a controllable impregnant pipeline with a switch;
the size of the positioning plate 11 is larger than that of the pressurizing tank body 2, when the sample to be impregnated is subjected to pre-vacuum pumping, the positioning plate 11 is fixed with the pressurizing plate 3, and the pressurizing plate 3 is clamped at the upper end of the pressurizing tank body 2, so that the pressurizing plate 3 is prevented from moving downwards due to the pressure difference between the inside and the outside of the tank body to influence subsequent pressurizing;
after the impregnation sample is subjected to pre-vacuumizing, the positioning plate 11 is detached, the pressure plate 3 and the pressure rod 4 are fixed, the upper cover plate 5 and the pressure tank body 2 are fixed, the pressure rod 4 penetrates through the upper cover plate 5 to be in threaded connection with the threaded sleeve 6, the threaded sleeve 6 is used for guiding the pressure rod 4, and a closed space is formed inside the tank body after assembly.
Wherein, the screw thread of the pressure plate 3 and the pressure rod 4 can be respectively provided with a sealing ring 7 and a sealing ring 9, and a sealing gasket 8 and a sealing gasket 10 are respectively arranged between the pressure tank body 2 and the bottom plate 1 and the upper cover plate 5. All sealing washer and seal gasket are all preferred to be adopted the fluorine and glue the material, can promote the pressure resistance of vacuum pressure impregnation mould. The size and the wall thickness of the pressurized tank body 2 are designed according to the size and the pressure parameters of an actual sample.
In some preferred embodiments, the pressurizing tank 2 is fixedly connected with the bottom plate 1 and the upper cover plate 5 through countersunk screws, the pressurizing plate 3 is fixedly connected with the positioning plate 11 through countersunk screws, and the pressurizing plate 3 is fixedly connected with the pressurizing rod 4 through countersunk screws.
In some preferred embodiments, the vacuum port is located higher than the slurry port on the pressurized tank 2 to prevent slurry from being drawn into the vacuum line during the vacuum pumping process.
In some preferred embodiments, the upper cover plate 5 and the threaded sleeve 6 are made of materials independently selected from teflon or nylon, etc. because they are not in direct contact with the impregnant slurry, so as to seal and reduce the weight of the mold.
In some preferred embodiments, the bottom plate 1, the pressurizing tank 2 and the pressurizing plate 3 are made of 304 or 316 stainless steel independently, so that the impregnant slurry is prevented from generating a chemical reaction with the stainless steel, and the material performance is prevented from being influenced.
In some preferred embodiments, the material of the pressure rod 4 and the positioning plate 11 is No. 45 steel quenching treatment, so as to reduce deformation caused by pressure.
The invention also provides a method for carrying out vacuum pressure impregnation by adopting the mould, which comprises the following steps:
fixedly connecting the bottom plate 1 with the pressurizing tank body 2, fixedly connecting the pressurizing plate 3 with the positioning plate 11, placing the pressurizing plate 3 in the pressurizing tank body 2 after placing a sample to be impregnated in the tank body, connecting the vacuum port with a vacuum pump through a rubber tube, and connecting the slurry port with a controllable impregnant pipeline with a switch;
controlling the impregnant pipeline to be in a closed state, opening a vacuum pump, performing pre-vacuumizing treatment on a sample to be impregnated, and closing the vacuum pump after completely vacuumizing gas remained in pores in the sample to be impregnated;
controlling the impregnant pipeline to be in an open state, so that the impregnant enters the tank body under the action of atmospheric pressure, and controlling the impregnant pipeline to be in a closed state after the impregnant in the tank body reaches a certain amount; controlling the liquid level of the impregnant in the tank body to be lower than the position of the slurry port;
the positioning plate 11 is removed, and the pressurizing rod 4, the upper cover plate 5 and the threaded sleeve 6 are connected in sequence;
opening a vacuum pump, vacuumizing the interior of the tank body, and then closing the vacuum pump;
and (3) placing the mould under a press machine, enabling the press machine to be in contact with the pressurizing rod 4, opening the press machine, and applying pressure to the mould to realize a vacuum pressure impregnation forming process for the sample.
And (4) after the vacuum pressure impregnation molding is finished, demolding is carried out, and thus one impregnation period of the sample is finished.
The pressure applied to the die by the press is controlled so as to control the vacuum impregnation pressure in the tank body, and quantitative pressure impregnation of the sample is realized; the pressure of vacuum impregnation in the tank body is calculated by the indication of a pressure gauge on the press machine.
The liquid level of the impregnant in the control tank body is lower than the position of the slurry port, so that the impregnant pipeline is prevented from being pressed in the pressurizing process, and the risk of bursting caused by the fact that the pipeline is not pressure-resistant is avoided. The controllable impregnant pipeline with the switch can be a metal impregnant pipeline with a ball valve, and can also be a simple impregnant pipeline made of materials such as PVC (polyvinyl chloride) hoses and the like, and the opening and the closing of the pipeline are realized through a clamp.
Example 1
The carbon fiber reinforced silicon carbide composite material adopts a mould to carry out vacuum pressure impregnation, and the process comprises the following steps:
connecting a bottom plate 1 and a pressurizing tank body 2 through a sunk screw, and sealing the contact surface of the bottom plate 1 and the pressurizing tank body 2 through a fluorine rubber gasket 10, wherein the inner diameter phi of the pressurizing tank body 2 is 165mm, and the outer diameter phi of the pressurizing tank body 2 is 200mm; placing the bottom plate 1 of the connector partially downwards, and placing a carbon fiber felt in the pressurizing tank body 2, wherein the density of the carbon fiber felt is 0.45g/cm 3 Dimension phi 150mm to 20mm;
installing a fluorine rubber O-shaped sealing ring 9 on the pressurizing plate 3, and connecting the positioning plate 11 and the pressurizing plate 3 through a sunk screw; placing a pressurizing plate 3 on the upper part of a pressurizing tank body 2, connecting a vacuum port with a vacuum pump through a rubber pipe, connecting a slurry port with a PVC flexible rubber pipe, folding the flexible rubber pipe in half, and sealing the pipeline through a clamp;
opening a vacuum pump, pre-vacuumizing the connected mold, completely vacuumizing gas remained in pores inside the carbon fiber felt, and displaying the vacuum degree inside the mold through a vacuum meter connected with the vacuum pump;
inserting the PVC flexible rubber hose into the prepared silicon carbide slurry, closing the vacuum pump, opening the clamp, slowly loosening the PVC flexible rubber hose, and allowing the silicon carbide slurry to enter the die under the action of atmospheric pressure; filling silicon carbide slurry with the liquid level lower than the slurry port into the mold, wherein the silicon carbide slurry is enough to impregnate the carbon fiber felt, folding the flexible rubber tube in half, and sealing the pipeline through the clamp;
the positioning plate 11 is detached, and the pressurizing rod 4, the upper cover plate 5 and the threaded sleeve 6 are connected in sequence, wherein the contact surface of the upper cover plate 5 and the pressurizing tank body 2 is sealed by a fluorine rubber gasket 8, and a fluorine rubber O-shaped sealing ring 7 is arranged at the thread of the pressurizing rod 4;
opening a vacuum pump, continuously vacuumizing the interior of the die, wherein the vacuum degree is 7KPa, moving a pressurizing rod 4 downwards under the action of atmospheric pressure, and closing the vacuum pump;
placing the die under a 30T press machine, contacting the press machine with a die pressurizing rod 4, opening the press machine, applying pressure to the die, and calculating the pressure inside the vacuum pressure impregnation die to be 3MPa through a pressure gauge on the press machine;
and (3) demolding, and finishing impregnation of the carbon fiber felt by the silicon carbide slurry to obtain a carbon fiber reinforced silicon carbide preform, wherein a real object diagram of the carbon fiber reinforced silicon carbide preform is shown in fig. 3. And then drying, degreasing at 1600 ℃ to obtain the carbon fiber reinforced silicon carbide composite material, and calculating the volume content of silicon carbide in the carbon fiber felt to be 16.4%.
The invention adopts the technical scheme that the advantages are as follows:
the invention relates to a vacuum pressure impregnation die, which comprises a bottom plate, a pressurization tank body, a pressurization plate, a pressurization rod, an upper cover plate, a threaded sleeve and a positioning plate, wherein the liquid level of an impregnant is directly pressurized through the pressurization plate, and the impregnant is fully impregnated into pores in a sample to be impregnated by utilizing the pressure of a liquid impregnant; the press machine applies pressure to the die through the pressure rod, the die is simple, the compression by using compressed air or inert gas is avoided, and the equipment cost is reduced; the mould can be designed according to the common size of the sample, and the waste of the impregnant is avoided. The method for carrying out vacuum pressure impregnation on the vacuum pressure impregnation die can realize the switching of the impregnant by replacing the impregnant pipeline or adopting the disposable impregnant pipeline, has wide applicability and is suitable for batch production.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A vacuum pressure impregnation die is characterized by comprising a bottom plate, a pressurizing tank body, a pressurizing plate, a pressurizing rod, an upper cover plate, a threaded sleeve and a positioning plate;
the bottom plate is fixedly connected with the pressurizing tank body and used for placing a sample to be impregnated; the pressure tank body is provided with a vacuum port and a slurry port, the vacuum port is connected with a vacuum pump through a rubber pipe, and the slurry port is connected with a controllable impregnant pipeline with a switch;
the positioning plate is larger than the pressurizing tank body, and when the sample to be impregnated is subjected to pre-vacuum pumping, the positioning plate is fixed with the pressurizing plate and clamps the pressurizing plate at the upper end of the pressurizing tank body, so that the pressurizing plate is prevented from moving downwards due to the pressure difference between the inside and the outside of the tank body in the process;
after the impregnation sample is subjected to pre-vacuumizing, the positioning plate is detached, the pressurizing plate is fixed with the pressurizing rod, the upper cover plate is fixed with the pressurizing tank body, the pressurizing rod penetrates through the upper cover plate to be in threaded connection with the threaded sleeve, the threaded sleeve is used for guiding the pressurizing rod, and a closed space is formed inside the tank body after assembly.
2. The vacuum pressure impregnation die of claim 1, wherein a sealing ring is disposed at the screw thread of each of the pressing plate and the pressing rod, and a sealing gasket is disposed between the pressing tank and each of the bottom plate and the upper cover plate.
3. The vacuum pressure impregnation die of claim 2, wherein all of the seal rings and the gasket are made of a fluoro-elastomer material.
4. The vacuum pressure impregnation die of claim 1, wherein the pressurizing tank body is fixedly connected with the bottom plate and the upper cover plate through countersunk screws, the pressurizing plate is fixedly connected with the positioning plate through countersunk screws, and the pressurizing plate is fixedly connected with the pressurizing rods through countersunk screws.
5. The vacuum pressure impregnation die of claim 1, wherein the vacuum port is located higher than the slurry port to prevent slurry from being drawn into the vacuum line during the vacuum pumping.
6. The vacuum pressure impregnation die of claim 1, wherein the upper cover plate and the threaded sleeve are independently selected from polytetrafluoroethylene or nylon.
7. The vacuum pressure impregnation die of claim 1, wherein the bottom plate, the pressure tank, and the pressure plate are made of a material independently selected from 304 or 316 stainless steel.
8. The vacuum pressure impregnation die of claim 1, wherein the material of the pressure bar and the positioning plate is No. 45 steel quenching.
9. A method of vacuum pressure impregnation using a mould according to any of claims 1-8, comprising the steps of:
fixedly connecting the bottom plate with the pressurizing tank body, fixedly connecting the pressurizing plate with the positioning plate, placing the pressurizing plate in the pressurizing tank body after a sample to be impregnated is placed in the tank body, connecting the vacuum port with a vacuum pump through a rubber tube, and connecting the slurry port with a controllable impregnant pipeline with a switch;
controlling the impregnant pipeline to be in a closed state, opening a vacuum pump, performing pre-vacuumizing treatment on a sample to be impregnated, and closing the vacuum pump after completely vacuumizing gas remained in pores inside the sample to be impregnated;
controlling the impregnant pipeline to be in an open state, so that the impregnant enters the tank body under the action of atmospheric pressure, and controlling the impregnant pipeline to be in a closed state after the impregnant in the tank body reaches a certain amount; controlling the liquid level of the impregnant in the tank body to be lower than the position of the slurry port;
the positioning plate is disassembled, and the pressurizing rod, the upper cover plate and the threaded sleeve are connected in sequence;
opening a vacuum pump, vacuumizing the interior of the tank body, and then closing the vacuum pump;
and (3) placing the mould under a press machine, enabling the press machine to be in contact with the pressurizing rod, opening the press machine, and applying pressure to the mould to realize a vacuum pressure impregnation forming process for the sample.
10. The vacuum pressure impregnation method of claim 9, wherein the quantitative pressure impregnation of the sample is achieved by controlling the pressure applied by the press to the die and thus the pressure of the vacuum impregnation inside the tank; the pressure of vacuum impregnation in the tank body is calculated by the indication of a pressure gauge on the press machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211536211.8A CN115770692A (en) | 2022-12-02 | 2022-12-02 | Vacuum pressure impregnation die and method |
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| CN202211536211.8A CN115770692A (en) | 2022-12-02 | 2022-12-02 | Vacuum pressure impregnation die and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117059352A (en) * | 2023-10-13 | 2023-11-14 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117059352A (en) * | 2023-10-13 | 2023-11-14 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
| CN117059352B (en) * | 2023-10-13 | 2024-01-30 | 搏世因（北京）高压电气有限公司 | Glue-immersed fiber capacitive dry sleeve and manufacturing method thereof |
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