A hot-pressing casting method for producing special ceramics

Abstract

The present application provides a hot-pressing casting method for producing special ceramics, which specifically includes the following steps: S1. Mix powder with paraffin to make a wax-containing slurry; S2. Add the wax-containing slurry into a hot-pressing casting device, and use the hot-pressing casting device to melt the wax-containing slurry and then inject it under pressure into the mold cavity in the hot-pressing casting device to form a green body; S3. Bury the hot-pressing cast green body in an adsorbent and heat it for dewaxing treatment; S4. Put the green body after dewaxing treatment into a calcining furnace for sintering and forming; S5. Grind the surface of the sintered and formed green body; S6. Glaze the surface of the ground green body; S7. Coat a metal layer on the surface of the green body by electroplating or chemical reduction method or physical vapor deposition method; S8. Clean, detect and package the metallized green body to form the final product. The hot-pressing casting method for producing special ceramics provided by the present application can produce special ceramics with high density, good strength and high dimensional accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic production, and particularly to a hot pressing casting method for producing special ceramics. Background Art

[0002] In the prior art, due to their excellent physical properties, special ceramics are widely used in the fields of aviation, military, electronics, etc. However, there are some deficiencies in the traditional production methods of special ceramics. For example, defects are likely to occur during the forming process, and the density and strength of the sintered ceramics are insufficient.

[0003] In recent years, although various improved production methods have been proposed, such as using different forming techniques and sintering processes, these methods still cannot fully solve the above problems. For example, some methods improve the forming efficiency but sacrifice the product quality; while others increase the production cost while improving the product quality.

[0004] Therefore, the present invention proposes a new hot pressing casting method, aiming to solve the problems existing in the prior art, improve the production efficiency and product quality of special ceramics, and reduce the production cost at the same time. Through the method of the present invention, special ceramics with high density, good strength and high dimensional accuracy can be produced to meet the requirements of modern industry for high-performance ceramic materials. Summary of the Invention

[0005] The purpose of the present invention is to provide a hot pressing casting method for producing special ceramics, so as to solve the technical problems that defects are likely to occur during the forming process of the traditional special ceramic production process, and the density and strength of the sintered ceramics are insufficient.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a hot pressing casting method for producing special ceramics, and the hot pressing casting method for producing special ceramics includes the following steps:

[0007] S1. Prepare a wax-containing slurry, and make the wax-containing slurry by mixing powder materials with paraffin wax.

[0008] S2. Hot pressing casting forming, add the wax-containing slurry into a hot pressing casting device, and use the hot pressing casting device to melt the wax-containing slurry and then inject it into the mold cavity in the hot pressing casting device under pressure to form a green body.

[0009] S3. Biscuit firing for dewaxing, bury the green body formed by hot pressing casting in an adsorbent and heat it for dewaxing treatment.

[0010] S4. Sintering forming, put the green body that has completed the dewaxing treatment into a calcining furnace for sintering forming.

[0011] S5. Grinding, perform grinding treatment on the surface of the sintered and formed green body.

[0012] S6. Glazing, perform glazing treatment on the surface of the ground blank body;

[0013] S7. Metallization, coat a metal layer on the surface of the blank body by electroplating, chemical reduction method or physical vapor deposition method;

[0014] S8. Clean, inspect and package the metallized blank body to form the final product.

[0015] In one embodiment, step S1 specifically includes:

[0016] S11. Batching, select a certain amount of ceramic raw materials;

[0017] S12. Ball milling, put the ceramic raw materials into a ball mill for ball milling to make ceramic powder with uniform particles;

[0018] S13. Slurrying, uniformly mix the ceramic powder, hot paraffin liquid and a small amount of surfactant to make a wax-containing slurry;

[0019] S14. Sample check the wax-containing slurry to ensure that the ratio of ceramic powder to hot paraffin liquid meets the preset value.

[0020] In one embodiment, in step S13, the mass fraction of the hot paraffin liquid in the wax-containing slurry is 21.7%, and the mass fraction of the surfactant in the wax-containing slurry is 0.4% - 0.8%.

[0021] In one embodiment, step S7 specifically includes:

[0022] S71. Paste coating, coat a paste layer containing metal powder on the surface of the ceramic blank body, and inspect the thickness of the paste layer. If the thickness of the paste layer does not meet the requirements, re-paste coating is needed;

[0023] S72. Primary metallization, perform high-temperature sintering on the paste-coated ceramic blank body to form a metal layer on the ceramic blank body;

[0024] S73. Electroplating, form a metal electroplating layer on the ceramic blank body by electroplating;

[0025] S74. Nickel plating, cover a nickel layer or nickel alloy layer on the surface of the metal electroplating layer of the ceramic blank body by chemical or electrochemical means.

[0026] In one embodiment, in step S2, the hot die casting device includes:

[0027] Heating, melting and extruding part, which is used to heat and melt the wax-containing slurry and output it from the extrusion tube at the bottom of the heating, melting and extruding part;

[0028] The model part, the model part includes a mold body and a die-casting channel. A cavity is arranged inside the mold body, and the die-casting channel is communicated with the cavity of the mold body. When hot die-casting is carried out, the extrusion tube is inserted and fitted into the inlet at the top of the die-casting channel to press the molten wax-containing slurry through the die-casting channel and inject it into the cavity.

[0029] In one embodiment, the cavity is a thin-surface rotating body, the die-casting channel is centrosymmetric about the central axis of the rotating body, and the extrusion tube is connected to the bottom outlet of the heating and melting extrusion part through a rotating sealing device; the hot die-casting device further includes:

[0030] A support platform, a circular through hole is arranged in the middle of the support platform;

[0031] A rotating mounting platform, the rotating mounting platform is arranged on the support platform through a bearing device, and the model part is fixed on the rotating mounting platform;

[0032] A rotating power part, the rotating power part is arranged on the support platform, and the power output shaft of the rotating power part passes through the circular through hole of the support platform and is connected to the rotating mounting platform; the rotation axis of the rotating power part coincides with the central axis of the die-casting channel and the central axis of the circular through hole;

[0033] A pressure sensing part, the pressure sensing part includes a plurality of pressure sensing sheets, the pressure sensing sheets are evenly arranged around the power output shaft and are located in the circular through hole;

[0034] An auxiliary heating part, the auxiliary heating part includes a plurality of heating sheets, and the heating sheets are evenly attached around the outside of the mold body;

[0035] The pressure sensing sheet is electrically connected to the heating sheet, and the pressure sensing sheet controls the operation of the heating sheet at the opposite position.

[0036] In one embodiment, the rotating sealing device includes a bearing structure and a mechanical sealing mechanism, and both the bearing structure and the mechanical sealing mechanism are arranged between the extrusion tube and the bottom outlet of the heating and melting extrusion part.

[0037] In one embodiment, the top of the die-casting channel is provided with an outwardly expanding open end, and the bottom of the extrusion tube is provided with a tapered tightening end that matches the open end of the die-casting channel.

[0038] In one or more of the above technical solutions in the embodiments of the present invention, at least the following technical effects or advantages are achieved:

[0039] The hot die-casting method for producing special ceramics provided by the embodiments of the present invention can efficiently produce special ceramics with excellent physical properties. By using a wax-containing slurry mixed with powder and paraffin, the shape and dimensional accuracy of the green body can be ensured during the hot die-casting forming process. The dewaxing step of preliminary sintering can effectively remove the wax in the green body, providing a good foundation for subsequent sintering and forming. After sintering and forming, the green body has high density and a uniform microstructure, thereby improving the mechanical strength and wear resistance of the ceramics. Grinding and glazing treatments further optimize the smoothness and aesthetics of the ceramic surface. The metallization step endows the ceramics with specific conductivity or reflectivity, broadening their application range. Finally, through cleaning, inspection, and packaging, the quality and consistency of the products are ensured, meeting the strict requirements of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 It is a flowchart of the hot die-casting method for producing special ceramics provided by the embodiments of the present invention;

[0042] Figure 2 It is a schematic structural diagram of the hot die-casting device provided by the embodiments of the present invention;

[0043] Figure 3 It is a cross-sectional view when die-casting is performed on the hot die-casting device provided by the embodiments of the present invention;

[0044] Figure 4 It is a schematic structural diagram of the pressure sensing part provided by the embodiments of the present invention.

[0045] Among them, the reference numerals of each part are as follows:

[0046] 1. Heating, melting, and extrusion part; 2. Mold part; 3. Support platform; 4. Rotating installation platform; 5. Rotating power part; 6. Pressure sensing part; 7. Auxiliary heating part; 8. Bearing device; 11. Extrusion pipe; 12. Rotating sealing device; 21. Mold main body; 22. Die-casting channel; 111. Tapered tightening end; 221. Open end. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Please refer to Figure 1 , the embodiments of the present application provide a hot pressing method for producing special ceramics, which specifically includes the following steps:

[0052] S1. Prepare a wax-containing slurry, and make a wax-containing slurry by mixing powder and paraffin.

[0053] S2. Hot pressing and forming, add the wax-containing slurry into a hot pressing device, and use the hot pressing device to melt the wax-containing slurry and then inject it into the mold cavity in the hot pressing device under pressure to form a blank.

[0054] S3. Biscuit firing and dewaxing: The green body formed by hot pressing is buried in the adsorbent and heated for dewaxing treatment. Specifically, the adsorbent can be pre-fired alumina powder. The alumina powder adsorbent can not only support the green body but also adsorb liquid paraffin, enabling the paraffin to decompose in the adsorbent, thereby achieving the purpose of dewaxing.

[0055] S4. Sintering and forming: The green body after dewaxing treatment is placed in a calcining furnace for sintering and forming.

[0056] S5. Grinding: The surface of the sintered and formed green body is ground. By grinding the surface of the green body, the surface of the green body becomes smoother and flatter, facilitating subsequent glazing treatment.

[0057] S6. Glazing: The surface of the ground green body is glazed.

[0058] S7. Metallization: A metal layer is coated on the surface of the green body by electroplating, chemical reduction method or physical vapor deposition method.

[0059] S8. The metallized green body is cleaned, inspected and packaged to form the final product.

[0060] In one embodiment, step S1 specifically includes:

[0061] S11. Batching: A certain amount of ceramic raw materials are selected.

[0062] S12. Ball milling: The ceramic raw materials are put into a ball mill for ball milling to make uniformly sized ceramic powder. By using a ball mill to mill the ceramic raw materials, the ceramic powder particles are finer and of uniform size, improving the quality of the manufactured ceramic products.

[0063] S13. Mixing with slurry: The ceramic powder is uniformly mixed with hot paraffin liquid and a small amount of surfactant to make a wax-containing slurry. Specifically, the mass fraction of the hot paraffin liquid in the wax-containing slurry is 21.7%, and the mass fraction of the surfactant in the wax-containing slurry is 0.4% - 0.8%.

[0064] S14. Sampling inspection of the wax-containing slurry is carried out to ensure that the ratio of the ceramic powder to the hot paraffin liquid meets the preset value.

[0065] In one embodiment, step S7 specifically includes:

[0066] S71. Paste coating: A paste layer containing metal powder is coated on the surface of the ceramic green body, and the thickness of the paste layer is inspected. If the thickness of the paste layer does not meet the requirements, re-pasting is required.

[0067] S72. Primary metallization: The paste-coated ceramic green body is subjected to high-temperature sintering to form a metal layer on the ceramic green body.

[0068] Among them, the paste application is mainly to form a metal layer on the ceramic surface, which can improve the bonding force between the metal and the ceramic. The paste usually contains pure metal powders (such as molybdenum, manganese) and metal oxides. These materials are sintered at high temperature (primary metallization) to form a metal layer and chemically react with the ceramic surface, thus achieving a firm bond between the metal and the ceramic. The process of paste application not only improves the electrical conductivity and mechanical strength of the ceramic, but also enhances its corrosion resistance and wear resistance. The manganese powder added to the paste helps to improve the bonding between the metal coating and the ceramic, because manganese can promote the sintering of the metal layer and its bonding with the ceramic. In addition, the paste application can also form an integral metal layer on the ceramic surface. This metal layer has a moderate thickness, is dense and void-free, meeting the conditions such as tensile strength and airtightness required for sealing. This is an important step to ensure the quality and performance of ceramic metallization.

[0069] S73. Electroplating, adopting electroplating to form a metal electroplating layer on the ceramic blank;

[0070] When metallizing the ceramic surface, electroplating is carried out first and then nickel plating. This process has its specific reasons and advantages:

[0071] Improve the electrical conductivity of the ceramic: The ceramic itself is a non-conductor. Electroplating can form a conductive metal layer on its surface, providing a necessary conductive substrate for subsequent nickel plating.

[0072] Enhance the roughness of the ceramic surface: The pretreatment before electroplating can increase the roughness of the ceramic surface, which helps the adhesion of the nickel layer. The metal layer formed by electroplating can provide more anchor points, enhancing the bonding force between the nickel layer and the ceramic. Improve the uniformity and adhesion of the nickel layer: The electroplated layer as an intermediate layer can make the subsequent nickel plating layer more uniform, and at the same time enhance the adhesion of the nickel layer, because the bonding between the electroplated layer and the ceramic is usually stronger than that of the nickel plating layer.

[0073] Provide necessary chemical activity: The electroplated layer can provide necessary chemical activity, making the chemical reaction in the nickel plating process proceed more smoothly, thus forming a high-quality nickel layer.

[0074] Optimize the performance of the nickel layer: Through the combination of electroplating and nickel plating, the performance of the nickel layer can be optimized, such as improving corrosion resistance, hardness and wear resistance, etc.

[0075] S74. Nickel plating, covering a nickel layer or nickel alloy layer on the surface of the metal electroplating layer of the ceramic blank by chemical or electrochemical means.

[0076] In one embodiment, in step S2, the hot die casting device includes:

[0077] The heating, melting and extrusion section 1 is used to heat and melt the wax-containing slurry and output it from the extrusion pipe 11 at the bottom of the heating, melting and extrusion section 1. Specifically, the heating, melting and extrusion section 1 includes a heating chamber for heating and melting the wax-containing slurry. The heating chamber is heated by a resistance wire. The melted filling liquid after heating in the heating chamber flows into the lower pressure chamber and is output from the extrusion pipe 11 at the bottom after being pressurized by the pressure chamber. A vertical movement mechanism (specifically, it can be driven by a cylinder) is also provided on the heating, melting and extrusion section 1, so that when hot die-casting is carried out, it can be driven to move downward by the vertical movement mechanism, so that the extrusion pipe 11 is inserted and fitted into the die-casting channel 22 of the lower mold section 2.

[0078] The mold section 2 includes a mold body 21 and a die-casting channel 22. A cavity is provided inside the mold body 21. The die-casting channel 22 is connected to the cavity of the mold body 21. When hot die-casting is carried out, the extrusion pipe 11 is inserted and fitted into the inlet at the top of the die-casting channel 22 to inject the melted wax-containing slurry into the cavity under pressure through the die-casting channel 22.

[0079] The melted raw material is pressurized and extruded into the mold section 2 through the heating, melting and extrusion section 1, flows into the cavity of the mold body 21 through the die-casting channel 22, and fills the cavity. Then the heating, melting and extrusion section 1 is driven to move upward by the vertical movement mechanism. After the mold body 21 is cooled, the mold body 21 is opened and the die-cast blank is taken out, and the hot die-casting forming process is completed.

[0080] When traditional hot die-casting devices die-cast thin-walled rotating parts (such as annular ceramic parts with a thin wall thickness), due to the general fluidity of the melted raw material itself and the fact that the melted paraffin liquid is prone to cooling and solidification, blocking the cavity, it is easy for traditional hot die-casting devices to have incomplete casting when die-casting thin-walled rotating parts, resulting in an incomplete die-cast blank.

[0081] To this end, in one embodiment, the cavity is a thin-surface of the rotating body, the die-casting channel 22 is centrosymmetric about the central axis of the rotating body, and the extrusion tube 11 is connected to the bottom outlet of the heating and melting extrusion part 1 through a rotating sealing device 12; the hot die-casting device further includes: a support platform 3, an auxiliary heating part 7, a rotating mounting platform 4, a rotating power part 5, and a pressure sensing part 6. A circular through hole is provided in the middle of the support platform 3; a rotating mounting platform 4, the rotating mounting platform 4 is arranged on the support platform 3 through a bearing device 8, and the model part 2 is fixed on the rotating mounting platform 4; the rotating power part 5 is arranged on the support platform 3, and the power output shaft of the rotating power part 5 passes through the circular through hole of the support platform 3 and is connected to the rotating mounting platform 4; the rotation axis of the rotating power part 5 coincides with the central axis of the die-casting channel 22 and the central axis of the circular through hole; the pressure sensing part 6 includes a plurality of pressure sensing sheets, and the pressure sensing sheets are evenly arranged around the power output shaft and are located in the circular through hole; the auxiliary heating part 7 includes a plurality of heating sheets, and the heating sheets are evenly attached to the outside of the mold body 21; the pressure sensing sheets are electrically connected to the heating sheets, and the pressure sensing sheets control the heating sheets at the opposite positions to work.

[0082] In this embodiment, by installing the model part 2 on the rotating mounting platform 4, when die-casting, the rotating power part 5 (specifically, it can be a motor) rotates, so that the rotating mounting platform 4 and the model part 2 rotate, and the centrifugal force is used to make the casting liquid (a mixture of molten wax and ceramic powder) in the middle die-casting channel 22 better flow into the cavity of the surrounding mold body 21, improving the filling ability of the casting liquid, and cooperating with the hydraulic pressure given by the heating and melting extrusion part 1 to the casting liquid, minimizing the incomplete blank caused by the cavity not being filled with the casting liquid.

[0083] In addition, during the die-casting process, if a local defect occurs due to the rapid solidification of the casting liquid at a certain place in the cavity of the mold body 21, since the mold body 21 is in a state of rotating around the central axis, the local defect will generate an eccentric force under the action of the centrifugal force (the direction of the eccentric force is along the missing part pointing to the center direction), and this eccentric force is transmitted to the rotating mounting platform 4 and acts on the power output shaft of the rotating power part 5, further causing the main shaft to deviate in the direction away from the missing part, and then squeezing the pressure sensing sheet on that side (for example, if there is a defect on the right side of the mold body 21, an eccentric force towards the left is generated, causing the pressure sensing sheet on the left to be pressed). After the pressure sensing sheet is pressed, it controls the heating sheet at the opposite position to work (that is, controls the heating sheet on the right side to work), and then the heating sheet heats the missing part, melting the paraffin that originally solidified and blocked the cavity, so that the casting liquid can continue to fill the missing part, ensuring the integrity of the cast blank. In summary, the hot die-casting device provided in this embodiment can automatically judge the position of the local defect during die-casting and take targeted remedial measures to ensure the integrity of the cast blank.

[0084] In one embodiment, the rotary sealing device 12 includes a bearing structure and a mechanical sealing mechanism, both of which are disposed between the bottom outlet of the extrusion tube 11 and the heating and melting extrusion part 1. The mechanical seal can seal the connection gap between the extrusion tube 11 and the rotary sealing device 12 to prevent the casting liquid from leaking out.

[0085] As Figure 3 shown, in one embodiment, the top of the die-casting channel 22 is provided with an outwardly expanding open end 221, and the bottom of the extrusion tube 11 is provided with a tapered tightening end 111 that cooperates with the open end 221 of the die-casting channel 22. By providing the open end 221 and the tapered tightening end 111, during hot die-casting, the tapered tightening end 111 at the bottom of the extrusion tube 11 is inserted into the open end 221 of the die-casting channel 22 so that the casting liquid in the extrusion tube 11 can enter the die-casting channel 22.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hot die casting method for producing special ceramics, characterized in that: The hot die casting method for producing special ceramics comprises the following steps: S1, preparing a waxy slurry, mixing a powder with paraffin to prepare a waxy slurry; S2, hot die casting, adding the wax-containing slurry into a hot die casting device, using the hot die casting device to melt the wax-containing slurry and then pressurizing and injecting it into a mold cavity in the hot die casting device to form a green body; S3, bisque sintering and dewaxing, burying the hot die-casting blank in an adsorbent and heating it for dewaxing treatment; S4, sintering and molding, placing the green body that has completed the wax removal treatment into a calcining furnace for sintering and molding; S5, grinding, grinding the surface of the sintered green body; S6, glazing, glazing the surface of the ground body; S7, metallization, coating a metal layer on the surface of the blank by electroplating, chemical reduction or physical vapor deposition; S8, cleaning, testing and packaging the metallized blank to form a final product; In step S2, the hot die casting device includes: A heating and melting extrusion section, which is used to heat and melt the wax-containing slurry and output it from an extrusion tube at the bottom of the heating and melting extrusion section; A model part, wherein the model part includes a mold body and a die-casting channel, wherein a cavity is arranged inside the mold body, and the die-casting channel is connected with the cavity of the mold body. When hot die-casting is performed, the extrusion tube is inserted into the inlet at the top of the die-casting channel to pressurize the molten wax-containing slurry and inject it into the cavity through the die-casting channel; The mold cavity is a thin-surfaced rotating body, the die-casting channel is centrally symmetrical about the central axis of the rotating body, and the extrusion tube is connected to the bottom outlet of the heating and melting extrusion part through a rotating sealing device; the hot die-casting device also includes: A supporting platform, wherein a circular through hole is arranged in the middle of the supporting platform; A rotating mounting platform, wherein the rotating mounting platform is arranged on the supporting platform through a bearing device, and the model part is fixed on the rotating mounting platform; A rotating power unit, the rotating power unit is arranged on the supporting platform, the power output shaft of the rotating power unit passes through the circular through hole of the supporting platform and is connected to the rotating mounting platform; the rotating axis of the rotating power unit coincides with the central axis of the die-casting channel and the central axis of the circular through hole; A pressure sensing part, the pressure sensing part includes a plurality of pressure sensing sheets, the pressure sensing sheets are evenly arranged around the power output shaft and are located in the circular through hole; An auxiliary heating part, the auxiliary heating part includes a plurality of heating sheets, and the heating sheets are evenly attached to the outside of the mold body around the heating sheet; The pressure-sensitive sheet is electrically connected to the heating sheet, and the pressure-sensitive sheet controls the heating sheet at the opposite position to operate.

2. A hot die casting method for producing special ceramics according to claim 1, characterized in that: The step S1 specifically includes: S11, batching, selecting a certain amount of ceramic raw materials; S12, ball milling, putting the ceramic raw material into a ball mill for ball milling to produce ceramic powder with uniform particles; S13, mixing the ceramic powder, hot paraffin liquid and a small amount of surfactant to form a wax-containing slurry; S14. Conduct random inspection on the wax-containing slurry to ensure that the ratio of ceramic powder to hot paraffin liquid meets the preset value.

3. A hot die casting method for producing special ceramics according to claim 2, characterized in that: In step S13, the mass fraction of the hot paraffin liquid in the wax-containing slurry is 21.7%, and the mass fraction of the surfactant in the wax-containing slurry is 0.4% to 0.8%.

4. A hot die casting method for producing special ceramics according to claim 1, characterized in that: Step S7 specifically includes: S71, applying paste, applying a paste layer containing metal powder on the surface of the ceramic body, and inspecting the thickness of the paste layer. If the thickness of the paste layer does not meet the requirements, re-applying the paste; S72, primary metallization, sintering the ceramic body after the paste is applied at high temperature to form a metal layer on the ceramic body; S73, electroplating, forming a metal electroplating layer on the ceramic body by electroplating; S74, nickelization, covering the surface of the metal electroplating layer of the ceramic body with a nickel layer or a nickel alloy layer by chemical or electrochemical means.

5. The hot die casting method for producing special ceramics according to claim 1, characterized in that: The rotary sealing device comprises a bearing structure and a mechanical sealing mechanism, and the bearing structure and the mechanical sealing mechanism are both arranged between the extrusion tube and the bottom outlet of the heating and melting extrusion part.

6. The hot die casting method for producing special ceramics according to claim 1, characterized in that: The top of the die-casting channel is provided with an open end expanding outward, and the bottom of the extrusion tube is provided with a conical tightening end matching with the open end of the die-casting channel.

Images