CN115635564A - Gel injection molding equipment and process - Google Patents
Gel injection molding equipment and process Download PDFInfo
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- CN115635564A CN115635564A CN202211363142.5A CN202211363142A CN115635564A CN 115635564 A CN115635564 A CN 115635564A CN 202211363142 A CN202211363142 A CN 202211363142A CN 115635564 A CN115635564 A CN 115635564A
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Abstract
The application relates to the technical field of ceramic production and discloses gel casting molding equipment and a gel casting molding process, which comprise a first mold, wherein the first mold comprises a first template, one side of the first template is provided with a first forming groove, the first template is provided with a pouring gate, the pouring gate is communicated with the first forming groove, and the first template is made of microporous materials; the second mold comprises a second mold plate, the second mold plate is arranged on one side of the opening of the first forming groove, a second forming groove is formed in one side, close to the first mold plate, of the second mold plate, and when the first mold is covered on the second mold, the groove wall of the first forming groove and the groove wall of the second forming groove jointly enclose to form a cavity; and one side of the first template, which is close to the second template, is provided with an organic diaphragm layer, and one side of the second template, which is close to the first template, is also provided with an organic diaphragm layer. The gel injection molding equipment solves the problem of low density of the ceramic blank.
Description
Technical Field
The application relates to the technical field of ceramic production, in particular to gel casting equipment and a gel casting process.
Background
With the development of science and the progress of industrial technology, the ceramic industry is rapidly expanded, the application field of ceramics is greatly expanded, and the reliability of ceramics is also greatly improved. The ceramic production process mainly comprises three stages of powder preparation, molding and sintering, wherein the molding is a key stage for transferring powder to ceramic, and has decisive influence on the performance, yield and cost of the ceramic.
Problems currently receiving widespread attention in the ceramic field include:
1. the method comprises the following steps of (1) approximately molding, wherein a green body which is as close to the final specification and size of a product as possible is prepared by a molding method, and the core technical key point of the approximately molding is that the density and the strength of the green body are improved as much as possible, so that the firing shrinkage of the ceramic is reduced;
2. the core technical key point of the forming of the large-size structural ceramic lies in controlling the density and the uniformity of a blank body so as to control the sintering shrinkage rate of the ceramic;
3. the formation of carbide and nitride ceramics, which are generally sintered at high temperature and high pressure, and the increase in density of the ceramic green body can reduce the pressure required to sinter the carbide and nitride ceramics, thereby reducing the production cost.
As can be seen from the analysis, the common core of the above problems lies in increasing the density of the ceramic green body, and therefore, it is necessary to invent an apparatus and a method capable of increasing the density of the ceramic green body.
Disclosure of Invention
To the deficiency of prior art, the application provides a gel casting molding equipment and technology, has solved the lower problem of ceramic idiosome density.
In order to achieve the above purpose, the present application provides the following technical solutions: a gel injection molding apparatus comprising:
the first die comprises a first die plate, a first forming groove is formed in one side of the first die plate, a pouring gate is arranged on the first die plate and communicated with the first forming groove, and the first die plate is made of a microporous material;
the second mold comprises a second mold plate, the second mold plate is arranged on one side of the opening of the first forming groove, a second forming groove is formed in one side, close to the first mold plate, of the second mold plate, and when the first mold is covered on the second mold, the groove wall of the first forming groove and the groove wall of the second forming groove jointly enclose to form a cavity;
and an organic diaphragm layer is arranged on one side of the first template close to the first template, and an organic diaphragm layer is also arranged on one side of the second template close to the second template.
Preferably, the first template is made of a microporous ceramic material.
Preferably, the pore diameter of the micropores is r, and r is more than or equal to 50nm and less than or equal to 500nm.
Preferably, the first template is provided with a heating channel, and a liquid inlet and a liquid outlet of the heating channel are both arranged on the first template.
Preferably, an exhaust channel is formed in the first template and is communicated with the cavity.
Preferably, the organic membrane layer is provided with a filtering hole, the aperture of the filtering hole is R, and R is more than or equal to 1nm and less than or equal to 50nm.
Preferably, making a slurry: preparing ceramic slurry according to the formula of the ceramic to be produced;
injecting into a mold: pouring the ceramic slurry into an injection machine, and injecting the ceramic slurry into the cavity by the injection machine;
pressure filtration: driving the second template to pressurize the ceramic slurry, accelerating the filtration of the ceramic slurry by the organic diaphragm layer, and primarily curing the blank;
heating and curing: and introducing high-temperature liquid into the first mould, and heating the first mould by the high-temperature liquid so as to heat the blank and solidify the blank.
Preferably, the heating and curing step further comprises the following steps:
standing at normal temperature: the green body is taken out of the mold and placed in a drying chamber, and the temperature and humidity in the drying chamber are controlled according to the kind of the ceramic to be produced.
Preferably, the step of injecting the ceramic slurry into the mold, wherein the pressure of the ceramic slurry injected into the cavity by the injection machine is p, and p is more than or equal to 25MPa and less than or equal to 200MPa.
Preferably, the ceramic slurry includes a solvent, a monomer, a cross-linking agent, an initiator, and a catalyst, and the organic barrier layer serves to separate the solvent from the ceramic slurry.
The application provides a gel casting equipment and technology, possesses following beneficial effect:
(1) According to the gel casting process, after the ceramic slurry is injected into the cavity, pressure is applied to the second template, so that the ceramic slurry can filter out the solvent from the ceramic slurry under the action of the organic diaphragm layer, and substances such as monomers, cross-linking agents, initiators and the like in the ceramic slurry are trapped in the cavity, thereby forming a high-density blank body, and solving the problem of low density of the ceramic blank body.
(2) This gel casting former sets up organic diaphragm layer through the one side that is close to the second template at first template, sets up organic diaphragm layer in one side that is close to first template at the second template, because organic diaphragm layer does not soak with the idiosome to the idiosome has higher intensity, has reduced the degree of difficulty of idiosome drawing of patterns, is favorable to the idiosome drawing of patterns.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic view of the overall structure of the embodiment of the present application.
FIG. 2 is a flow chart of a gel casting process according to an embodiment of the present application.
In the figure: 1. a first mold; 2. a second mold; 3. a first template; 4. a second template; 5. a frame; 6. a cavity; 7. an organic separator layer; 8. a heating channel; 9. an exhaust passage; 10. and a pouring channel.
Detailed Description
In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, 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 application.
In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
The technical scheme of the application is further explained by combining the attached drawings 1-2 and through a specific implementation mode.
Example 1:
the application provides a technical scheme: a gel injection molding apparatus includes a first mold 1 and a second mold 2. First mould 1 sets up with second mould 2 is relative, and first mould 1 includes first template 3, and second mould 2 includes second template 4 and frame 5, and second template 4 fixed mounting is in frame 5, and first template 3 slides and connects in frame 5 for first template 3 can be close to or keep away from second template 4.
When the first mold 1 is covered on the second mold 2, the groove wall of the first forming groove and the groove wall of the second forming groove jointly enclose to form a cavity 6 for ceramic forming.
The first template 3 is made of porous materials, in the embodiment, the first template 3 is made of microporous ceramic materials, the pore diameter of each micropore is r, r is more than or equal to 50nm and less than or equal to 500nm, the structural strength of the first template 3 can be ensured by enabling r to be more than or equal to 50nm and less than or equal to 500nm, a solvent in ceramic slurry can leak out of the micropores in the first template 3, and the curing molding of a ceramic blank is facilitated.
One side of the first template 3 close to the second template 4 is covered with an organic diaphragm layer 7, the organic diaphragm layer 7 is provided with a plurality of filtering holes, the aperture of each filtering hole is R, R is larger than or equal to 1nm and smaller than or equal to 50nm, and R is larger than or equal to 1nm and smaller than or equal to 50nm, so that not only can the solvent in the ceramic slurry be filtered, but also substances such as monomers, cross-linking agents, initiators, catalysts and the like in the ceramic slurry can be intercepted, and the density of the blank body can be improved. The second template 4 is made of an organic film material, so that the whole second template 4 is also in a porous structure, and the solvent in the ceramic slurry can flow out of the second template 4.
Seted up heating channel 8 on first template 3, heating channel 8 has inlet and liquid outlet to heating channel 8's inlet and liquid outlet are all seted up on first template 3, make to inject the heating fluid body into heating channel 8 from heating channel 8's inlet, make the heating fluid body leave from heating channel 8's liquid outlet afterwards, thereby realize the convection heat transfer of heating fluid body and first template 3.
A pouring channel 10 for injecting ceramic slurry is arranged on the first template 3, one end of the pouring channel 10 is communicated with the cavity 6, and the other end of the pouring channel 10 penetrates through the first template 3. In addition, still seted up exhaust passage 9 on the first template 3, the one end and the die cavity 6 intercommunication of exhaust passage 9, the other end run through first template 3 for when pouring into ceramic thick liquids into die cavity 6, the air in the die cavity 6 can be followed and discharged in exhaust passage 9, is favorable to improving the density of idiosome.
In summary, the organic membrane layer 7 is disposed on the side of the first template 3 close to the second template 4, and the organic membrane layer 7 is disposed on the side of the second template 4 close to the first template 3, because the organic membrane layer 7 is not infiltrated by the green body, and the green body has high strength, the difficulty of demolding the green body is reduced, and the demolding of the green body is facilitated.
Example 2:
the present embodiment provides a gel injection molding process, including:
preparing slurry: preparing ceramic slurry according to a formula of the ceramic to be produced, and uniformly stirring the ceramic slurry;
injecting into a mold: pouring the ceramic slurry into an injection machine, injecting the ceramic slurry into the cavity by using the injection machine, and simultaneously opening an exhaust port to exhaust air in the cavity;
pressure filtration: because the ceramic slurry comprises the solvent, the monomer, the cross-linking agent, the initiator and the catalyst, the filter holes on the organic diaphragm layer can filter out the solvent, and the monomer, the cross-linking agent, the initiator, the catalyst and the like are trapped in the cavity and used for separating the solvent from the ceramic slurry. Therefore, the external driving equipment is used for injecting the pressing liquid into the second template, the pressing liquid is used for pressurizing the ceramic slurry, the filtering of the organic diaphragm layer on the ceramic slurry is accelerated, and the blank is primarily cured;
heating and curing: high-temperature liquid is introduced into the heating channel of the first mold, so that the high-temperature liquid enters the first mold from the liquid inlet of the heating channel and leaves the first mold from the liquid outlet of the heating channel, thereby realizing the convective heat exchange between the high-temperature liquid and the first mold, heating the first mold by the high-temperature liquid, heating the blank body, and accelerating the rate of chemical reaction of substances in the blank body by high temperature, thereby accelerating the solidification of the blank body;
standing at normal temperature: and taking the blank out of the die and placing the blank in a drying chamber, and controlling the temperature and the humidity in the drying chamber according to the type of the ceramic to be produced, so that the moisture in the blank is controlled, and the cracks on the surface of the blank are reduced.
In the step of injecting into the mould, the pressure of injecting the ceramic slurry into the cavity by the injection machine is p, wherein p is more than or equal to 25MPa and less than or equal to 200MPa. When p is less than or equal to 25MPa, the ceramic slurry is difficult to inject into the cavity by an injection machine; when the p is more than or equal to 200MPa, the organic diaphragm layer on the die can be damaged due to the fact that the ceramic slurry is injected at an excessively high speed, and the die is damaged; when p is more than or equal to 25MPa and less than or equal to 200MPa, the ceramic slurry can be injected into the cavity, and the damage of the ceramic slurry to the organic diaphragm layer can be reduced.
To sum up, after the ceramic slurry is injected into the cavity, pressure is applied to the second template, so that the solvent in the ceramic slurry is filtered out from the ceramic slurry under the action of the organic diaphragm layer, and the monomers, the cross-linking agent, the initiator and other substances in the ceramic slurry are retained in the cavity, thereby forming a high-density blank and solving the problem of low density of the ceramic blank.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.
Claims (10)
1. A gel injection molding apparatus, comprising:
the first die (1) comprises a first die plate (3), a first forming groove is formed in one side of the first die plate (3), a pouring gate (10) is arranged on the first die plate (3), the pouring gate (10) is communicated with the first forming groove, and the first die plate (3) is made of a porous material;
the second mold (2) comprises a second mold plate (4), the second mold plate (4) is arranged on one side of the opening of the first forming groove, a second forming groove is formed in one side, close to the first mold plate (3), of the second mold plate (4), and when the first mold (1) is covered on the second mold (2), the groove wall of the first forming groove and the groove wall of the second forming groove jointly enclose to form a cavity (6);
an organic diaphragm layer (7) is arranged on one side, close to the second template (4), of the first template (3), and an organic diaphragm layer (7) is also arranged on one side, close to the first template (3), of the second template (4).
2. A gel injection molding apparatus according to claim 1, wherein the first mold plate (3) is made of a micro-porous ceramic material.
3. The apparatus of claim 2, wherein the pores have a diameter r, wherein r is greater than or equal to 50nm and less than or equal to 500nm.
4. The gel injection molding apparatus according to claim 1, wherein the first mold plate (3) is provided with a heating channel (8), and a liquid inlet and a liquid outlet of the heating channel (8) are both provided on the first mold plate (3).
5. A gel injection moulding apparatus according to claim 1, wherein said first mould plate (3) is provided with an air vent channel (9), said air vent channel (9) being in communication with said cavity (6).
6. A gel injection moulding apparatus according to claim 1, wherein the organic membrane layer (7) has filter holes with a pore size R,1nm R50 nm.
7. A gel injection molding process, comprising:
preparing slurry: preparing ceramic slurry according to a formula of the ceramic to be produced;
injecting into a mold: pouring the ceramic slurry into an injection machine, and injecting the ceramic slurry into the cavity by the injection machine;
pressure filtration: pressurizing the ceramic slurry by using external driving equipment, and accelerating the filtration of the ceramic slurry by the organic diaphragm layer to preliminarily solidify the blank;
heating and curing: and introducing high-temperature liquid into the first mould, and heating the first mould by the high-temperature liquid so as to heat the blank and solidify the blank.
8. A gel injection molding process according to claim 7, further comprising, after the heat curing step:
standing at normal temperature: the green body is taken out of the mold and placed in a drying chamber, and the temperature and humidity in the drying chamber are controlled according to the kind of the ceramic to be produced.
9. The gel casting process according to claim 7, wherein the step of injecting into the mold is performed under a pressure p, p is greater than or equal to 25MPa and less than or equal to 200MPa, when the ceramic slurry is injected into the cavity by the injection machine.
10. A gelcasting process according to claim 7, wherein the ceramic slurry comprises a solvent, a monomer, a cross-linking agent, an initiator and a catalyst, and the organic barrier layer is used to separate the solvent from the ceramic slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211363142.5A CN115635564A (en) | 2022-11-02 | 2022-11-02 | Gel injection molding equipment and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211363142.5A CN115635564A (en) | 2022-11-02 | 2022-11-02 | Gel injection molding equipment and process |
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| Publication Number | Publication Date |
|---|---|
| CN115635564A true CN115635564A (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211363142.5A Pending CN115635564A (en) | 2022-11-02 | 2022-11-02 | Gel injection molding equipment and process |
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|---|---|
| CN (1) | CN115635564A (en) |
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- 2022-11-02 CN CN202211363142.5A patent/CN115635564A/en active Pending
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