3D printing preparation of lightweight high-thermal-resistance zirconia ceramic screw and preparation method

Abstract

The application discloses a 3D printing preparation method of a lightweight high-thermal-resistance zirconia ceramic screw, and the preparation method comprises the following steps: preparing a first ceramic slurry, wherein the first ceramic slurry comprises zirconia powder and a first photosensitive resin in a volume ratio of (30-50):(50-70); preparing a second ceramic slurry, wherein the second ceramic slurry comprises zirconia powder and a second photosensitive resin in a volume ratio of (55-60):(50-60); the solid content of the first ceramic slurry is less than that of the second ceramic slurry; the first ceramic slurry and the second ceramic slurry are used for 3D printing to respectively prepare a ceramic screw blank and a ceramic mold blank which is coated outside the ceramic screw blank; the lightweight high-thermal-resistance zirconia ceramic screw is separated from the ceramic mold to obtain the lightweight high-thermal-resistance zirconia ceramic screw; and the zirconia ceramic screw has a low axial thermal conductivity coefficient and a high axial strength, and the problem of fracture in the radial direction in the use process is avoided.

Description

Technical Field

[0001] This invention relates to the field of zirconia ceramic screws, and more specifically to the field of 3D printing preparation of lightweight, high thermal resistance zirconia ceramic screws and preparation methods. Background Technology

[0002] Zirconia ceramic screws can withstand operating environments up to 1200℃ for extended periods. They are used to secure thermoelectric battery heat source systems and reduce heat leakage. Therefore, zirconia ceramic screws need to have both high axial strength and good axial thermal insulation performance. Since zirconia ceramic screws also serve a supporting function, and the main body of the screw is neither inside nor outside the support frame, radial breakage is prone to occur at the contact point between the screw and the outer wall of the support frame during use.

[0003] Therefore, how to achieve zirconia ceramic screws with low axial thermal conductivity and high axial strength, while avoiding radial breakage during use, has become a pressing problem to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a method for 3D printing lightweight, high thermal resistance zirconia ceramic screws, which achieves zirconia ceramic screws with low axial thermal conductivity and high axial strength, while avoiding radial breakage during use.

[0005] One aspect of the present invention provides a method for 3D printing lightweight, high thermal resistance zirconia ceramic screws, comprising the following steps:

[0006] A first ceramic slurry is prepared, wherein the first ceramic slurry comprises zirconium oxide powder and a first photosensitive resin in a volume ratio of (30-50):(50-70);

[0007] A second ceramic slurry is prepared, the second ceramic slurry comprising zirconium oxide powder and a second photosensitive resin in a volume ratio of (55-60):(50-60);

[0008] The solid content of the first ceramic slurry is less than that of the second ceramic slurry;

[0009] Ceramic screw blanks and ceramic mold blanks covering the outside of the ceramic screw blanks are prepared by 3D printing using the first ceramic slurry and the second ceramic slurry, respectively.

[0010] The outer surface structure of the ceramic screw blank matches the inner surface structure of the ceramic mold blank; the distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 0.5-5mm;

[0011] The ceramic screw blank and the ceramic mold blank covering the ceramic screw blank are simultaneously degreased and degummed, and then sintered to obtain a lightweight, high thermal resistance zirconia ceramic screw and a ceramic mold covering the lightweight, high thermal resistance zirconia ceramic screw.

[0012] By rotating a lightweight, high thermal resistance zirconia ceramic screw relative to a ceramic mold, the lightweight, high thermal resistance zirconia ceramic screw is separated from the ceramic mold, thus obtaining a lightweight, high thermal resistance zirconia ceramic screw; preferably, the ceramic mold blank and the ceramic screw blank are freeform blanks.

[0013] The advantages of this invention over the prior art are that by using the first ceramic slurry and the second ceramic slurry to prepare a ceramic screw blank and a ceramic mold blank covering the outside of the ceramic screw blank through 3D printing, the ceramic screw blank and the ceramic mold blank covering the outside of the ceramic screw blank can be debonded and sintered simultaneously. During the debonding and sintering process, the ceramic screw blank and the external ceramic mold shrink and change proportionally, thereby avoiding the problem of deformation or cracking due to the length of the ceramic screw blank, which is beneficial to improving the coaxiality of the zirconia ceramic screw; thus, it is beneficial to achieve high axial strength of the ceramic screw blank and low radial fracture resistance.

[0014] By using zirconium oxide powder in both the first and second ceramic slurries, the screws and the external ceramic mold shrink proportionally during the debinding and sintering processes.

[0015] The solid content of the first ceramic slurry is lower than that of the second ceramic slurry, which is beneficial for achieving a faster glue removal rate during the glue removal process of the ceramic mold blank. It also helps the volatiles discharged during the glue removal process of the ceramic screw blank to be discharged through the channels created in the ceramic mold blank during the glue removal process. This helps to avoid problems such as cracks or deformation in the ceramic screw blank and improves the coaxiality of the zirconia ceramic screw. This also helps to achieve high axial strength of the ceramic screw blank and prevent radial breakage. At the same time, it helps to ensure that the shrinkage ratio of the ceramic mold after sintering is slightly smaller or similar to that of the zirconia ceramic screw, avoiding the problem of the zirconia ceramic screw being squeezed by the ceramic mold, and facilitating the separation of the zirconia ceramic screw from the ceramic mold.

[0016] The outer surface structure of the ceramic screw blank matches the inner surface structure of the ceramic mold blank; the distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 0.5-5mm; this is conducive to achieving proportional shrinkage of the ceramic screw blank and the external ceramic mold during the glue removal and sintering process, and at the same time, it is conducive to the detachment of the zirconia ceramic screw from the ceramic mold after subsequent sintering without damaging the zirconia ceramic screw.

[0017] The first ceramic slurry comprises zirconia powder and a first photosensitive resin in a volume ratio of (30-50):(50-70), which helps to achieve higher strength and higher porosity in the obtained zirconia ceramic screw, thereby helping to reduce the thermal conductivity of the zirconia ceramic screw.

[0018] Furthermore, the first photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of (1-3):1.

[0019] The first photocurable resin includes one or two of N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate;

[0020] The second photocurable resin includes one or two of ethoxytrimethylolpropane triacrylate and pentaerythritol tetraacrylate.

[0021] The beneficial effect of the previous step is that the first photocurable resin is a polymer monomer containing one double bond, and the first photocurable resin contains three or four double bonds; by including the first photocurable resin and the second photocurable resin in a mass ratio of (1-3):1, the proportion of polymers with smaller molecular weights in the ceramic mold blank prepared by 3D printing of the first ceramic slurry is high and the proportion of polymers with larger molecular weights is low. As a result, the glue removal rate of the ceramic mold blank is fast during the glue removal process, which is conducive to generating more glue removal holes compared to the ceramic screw blank, thus facilitating the glue removal of the ceramic screw blank.

[0022] Furthermore, the second photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1:(1-3).

[0023] The first photocurable resin includes one or two of N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate;

[0024] The second photocurable resin includes one or two of ethoxytrimethylolpropane triacrylate and pentaerythritol tetraacrylate.

[0025] The beneficial effect of the previous step is that it helps to improve the strength of the second photosensitive resin, which includes the first photocurable resin and the second photocurable resin in a mass ratio of 1:(1-3), thereby helping to avoid deformation of the ceramic screw blank during the glue removal process; at the same time, it helps to achieve a faster glue removal rate of the ceramic mold blank than that of the ceramic screw blank during the glue removal process, and helps the ceramic mold blank to generate more glue removal through holes first, thereby helping the volatiles of the ceramic screw blank to be discharged through the glue removal through holes generated in the ceramic mold blank.

[0026] Furthermore, the ceramic screw blank includes an external thread blank and a screw body blank sleeved inside the external thread blank;

[0027] The outer surface of the external thread blank is provided with a helical screw thread; the inner surface of the external thread blank is connected to the surface of the screw body blank.

[0028] The screw body blank includes several transverse support unit blanks, which are arranged perpendicular to the axial direction; the several transverse support unit blanks are arranged in parallel and connected along the axial direction of the screw body blank;

[0029] The transverse support unit blank includes one or more basic support unit blanks;

[0030] The basic support unit blank is composed of 4 support rod blanks that intersect at a point, and the intersection point of the support rod blanks is the midpoint of each support rod blank; the 4 support rod blanks are of equal length.

[0031] The beneficial effect of the previous step is that the screw body blank includes several transverse support unit blanks, which are arranged perpendicular to the axial direction; the several transverse support unit blanks are arranged in parallel, which increases the radial strength of the zirconia ceramic screw, thereby avoiding the problem of radial breakage of the zirconia ceramic screw during use.

[0032] The axial strength of the zirconia ceramic screw is enhanced by arranging and connecting several of the aforementioned transverse support unit blanks along the axial direction of the screw body blank.

[0033] The basic support unit blank is composed of four support rod blanks that intersect at a point. The intersection point of the support rod blanks is the midpoint of each support rod blank. The four support rod blanks are of equal length. This not only enhances the axial and radial strength of the zirconia ceramic screw, but also significantly increases the axial porosity of the zirconia ceramic screw, thereby reducing the thermal conductivity of the zirconia ceramic screw.

[0034] Furthermore, the basic support unit blank is arranged perpendicular to the axial direction. When the transverse support unit blank includes multiple basic support unit blanks, the multiple basic support unit blanks are at the same height in the axial direction, and the endpoints of the four support rod blanks of the basic support unit blank are connected to the endpoints of the four support rod blanks of the adjacent basic support unit blank.

[0035] Furthermore, the endpoints of the four support rod blanks connecting the basic support unit blank to the external thread blank are support endpoints, and some of the support endpoints correspond to the grooves of the screw threads on the outer surface of the external thread blank.

[0036] The beneficial effect of the previous step is that by having part of the support endpoints correspond to the tooth grooves of the screw threads on the outer surface of the external thread blank, the radial strength of the zirconia ceramic screw is further improved, and the glue removal of the base support unit blank is facilitated during the glue removal process.

[0037] Furthermore, the length of the ceramic screw blank is L1; the diameter of the ceramic screw blank is d1; the diameter of the support rod blank is d0; and the number of basic support unit blanks included in the transverse support unit blank is n.

[0038] When L1≥100mm, d1≥8mm, d0≤L1×(16d1) -1 mm, n≥3;

[0039] When L1 < 100 mm, d1 < 8 mm, L1 × (16d1) -1 mm≤d0≤d1 / 4, n<3.

[0040] The advantages of the previous step are that it facilitates increasing the number of basic support unit blanks included in the transverse support unit blank when the ceramic screw blank length is large, i.e., L1≥100mm, and increasing the diameter of the ceramic screw blank, thereby improving the radial and axial strength of the zirconia ceramic screw. By reducing the diameter of the support rod blank, a significant increase in the thermal conductivity of the zirconia ceramic screw is avoided. Furthermore, due to the increased length of the ceramic screw blank, the thermal conductivity requirement for the zirconia ceramic screw is reduced during use. Thus, when L1≥100mm, a significant increase in the thermal conductivity of the zirconia ceramic screw is avoided, meeting the usage requirements.

[0041] This approach is beneficial when the length of the ceramic screw blank is not large, i.e., when L1 < 100 mm, by reducing the diameter of the ceramic screw blank and lowering the thermal conductivity of the zirconia ceramic screw. By reducing the number of basic support unit blanks included in the transverse support unit blank, the thermal conductivity of the zirconia ceramic screw is reduced, thereby meeting the requirement of reduced thermal conductivity when L1 < 100 mm. Furthermore, by increasing the diameter of the support rod blank, the radial and axial strength of the zirconia ceramic screw is improved.

[0042] Furthermore, the ceramic mold blank includes a mold thread blank disposed on the inner surface of the mold blank, the mold thread blank matching the screw thread blank of the external thread blank;

[0043] The distance between the die thread blank and the opposite screw thread blank is 0.5-5mm.

[0044] The beneficial effect of the previous step is that by matching the screw thread blank of the mold thread blank with the screw thread blank of the external thread blank, the zirconia ceramic screw obtained after sintering is separated from the outer ceramic mold in a spiral manner.

[0045] Furthermore, the protruding part of the mold thread is provided with a first through hole that penetrates radially along the ceramic mold blank, and the diameter of the first through hole is 0.1-0.5mm;

[0046] The groove portion of the mold thread is provided with several second through holes arranged circumferentially, and the diameter of the second through holes is 0.1-0.5mm.

[0047] The beneficial effect of the previous step is that the protrusion of the mold thread has a first through hole that penetrates radially along the ceramic mold blank, which is beneficial for the heat in the environment during the glue removal process to reach the thread of the ceramic screw blank through the first through hole, and is beneficial for the uniform heating of the ceramic screw blank.

[0048] The die thread has several circumferentially arranged second through holes, which facilitate the discharge of volatile organic compounds during the glue removal process of the ceramic screw blank. This helps to prevent cracks or deformation of the ceramic screw blank during the glue removal process.

[0049] In another aspect, the present invention provides a method for 3D printing lightweight high thermal resistance zirconia ceramic screws, which are prepared by the aforementioned method for 3D printing lightweight high thermal resistance zirconia ceramic screws.

[0050] The 3D-printed lightweight high thermal resistance zirconia ceramic screw includes an external thread and a screw body sleeved inside the external thread; the 3D-printed lightweight high thermal resistance zirconia ceramic screw is composed of a columnar part and a conical part along the axial direction, and the outer surfaces of both the columnar part and the conical part are provided with external threads, and the end of the columnar part away from the conical part is provided with a groove.

[0051] The screw body includes several transverse support units, which are arranged perpendicular to the axial direction; the several transverse support units are arranged in parallel and connected along the axial direction of the screw body;

[0052] The lateral support unit includes one or more basic support units;

[0053] The basic support unit consists of four support rods that intersect at a single point, with the intersection point being the midpoint of each support rod; all four support rods are of equal length.

[0054] The basic support unit is arranged perpendicular to the axial direction. When the transverse support unit includes multiple basic support units, the multiple basic support units are at the same height in the axial direction, and the endpoints of the four support rods of the basic support unit are connected to the endpoints of the four support rods of the adjacent basic support unit.

[0055] The ends of the four support rods that connect the basic support unit to the external thread blank are the support ends, and the support ends correspond to the grooves of the screw threads on the outer surface of the external thread.

[0056] The beneficial effect of this invention compared to the prior art is that, by including a plurality of transverse support units in the screw body, the transverse support units are arranged perpendicular to the axial direction; the plurality of transverse support units are arranged in parallel, which increases the radial strength of the zirconia ceramic screw, thereby avoiding the problem of radial breakage of the zirconia ceramic screw during use;

[0057] The axial strength of the zirconia ceramic screw is enhanced by arranging and connecting several of the aforementioned transverse support units along the axial direction of the screw body.

[0058] The basic support unit consists of four support rods that intersect at a single point, with the intersection point being the midpoint of each support rod. All four support rods are of equal length. This design enhances the axial and radial strength of the zirconia ceramic screw while significantly increasing the axial porosity of the zirconia ceramic screw, thereby reducing its thermal conductivity.

[0059] By having part of the support endpoints correspond to the tooth grooves of the screw thread on the outer surface of the external thread, the radial strength of the zirconia ceramic screw is further improved. At the same time, it is also beneficial to remove the glue from the base support unit blank during the glue removal process, thereby avoiding a decrease in the strength of the zirconia ceramic screw.

[0060] Simultaneously, the radial and axial strength and thermal conductivity of the zirconia ceramic screw can be adjusted by the diameter of the support rod and the number of basic support units included in the transverse support unit. Increasing the diameter of the support rod is beneficial to improving the radial strength of the zirconia ceramic screw, but not beneficial to reducing the thermal conductivity of the zirconia ceramic screw. When the number of basic support units included in the transverse support unit is small, the thermal conductivity of the zirconia ceramic screw can be reduced. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of a zirconia ceramic screw;

[0062] Figure 2 This is a schematic diagram of a portion of the transverse support unit inside a zirconia ceramic screw;

[0063] Figure 3 This is a schematic diagram of the basic support unit inside a zirconia ceramic screw. Detailed Implementation

[0064] To better understand the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0065] Example 1:

[0066] This embodiment provides a method for 3D printing lightweight, high thermal resistance zirconia ceramic screws, including the following steps:

[0067] A first ceramic slurry is prepared, the first ceramic slurry comprising zirconium oxide powder and a first photosensitive resin in a volume ratio of 40:60;

[0068] The first photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 2:1;

[0069] The first photocurable resin includes N-vinylcaprolactam;

[0070] The second photocurable resin includes ethoxytrimethylolpropane triacrylate.

[0071] A second ceramic slurry is prepared, the second ceramic slurry comprising zirconium oxide powder and a second photosensitive resin in a volume ratio of 58:55;

[0072] The second photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1:2;

[0073] The first photocurable resin includes N-vinylcaprolactam;

[0074] The second photocurable resin includes ethoxytrimethylolpropane triacrylate.

[0075] The solid content of the first ceramic slurry is less than that of the second ceramic slurry;

[0076] Ceramic screw blanks and ceramic mold blanks covering the outside of the ceramic screw blanks are prepared by 3D printing using the first ceramic slurry and the second ceramic slurry, respectively.

[0077] The ceramic screw blank includes an external thread blank and a screw body blank sleeved inside the external thread blank;

[0078] The outer surface of the external thread blank is provided with a helical screw thread; the inner surface of the external thread blank is connected to the surface of the screw body blank.

[0079] The screw body blank includes several transverse support unit blanks, which are arranged perpendicular to the axial direction; the several transverse support unit blanks are arranged in parallel and connected along the axial direction of the screw body blank;

[0080] The transverse support unit blank includes 3 basic support unit blanks;

[0081] The basic support unit blank is composed of 4 support rod blanks that intersect at a point, and the intersection point of the support rod blanks is the midpoint of each support rod blank; the 4 support rod blanks are of equal length.

[0082] The basic support unit blank is arranged perpendicular to the axial direction. When the transverse support unit blank includes multiple basic support unit blanks, the multiple basic support unit blanks are at the same height in the axial direction, and the ends of the four support rod blanks of the basic support unit blank are connected to the ends of the four support rod blanks of the adjacent basic support unit blank.

[0083] The outer surface structure of the ceramic screw blank matches the inner surface structure of the ceramic mold blank; the distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 2.7 mm; the ceramic mold blank is a freeform blank; the ceramic mold blank includes a mold thread blank disposed on the inner surface of the mold blank, the mold thread blank matches the screw thread blank of the external thread blank; the distance between the mold thread blank and the opposite screw thread blank is 2.7 mm.

[0084] The ceramic screw blank and the ceramic mold blank covering the ceramic screw blank are simultaneously degreased and degummed, and then sintered to obtain a lightweight, high thermal resistance zirconia ceramic screw and a ceramic mold covering the lightweight, high thermal resistance zirconia ceramic screw.

[0085] By rotating a lightweight, high thermal resistance zirconia ceramic screw relative to a ceramic mold, the lightweight, high thermal resistance zirconia ceramic screw is separated from the ceramic mold, thus obtaining a lightweight, high thermal resistance zirconia ceramic screw.

[0086] Another aspect of this embodiment provides a method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing.

[0087] The 3D-printed lightweight high thermal resistance zirconia ceramic screw includes an external thread and a screw body sleeved inside the external thread; the 3D-printed lightweight high thermal resistance zirconia ceramic screw is composed of a columnar part and a conical part along the axial direction, and the outer surfaces of both the columnar part and the conical part are provided with external threads, and the end of the columnar part away from the conical part is provided with a groove.

[0088] The screw body includes several transverse support units, which are arranged perpendicular to the axial direction; the several transverse support units are arranged in parallel and connected along the axial direction of the screw body;

[0089] The lateral support unit includes one or more basic support units;

[0090] The basic support unit consists of four support rods that intersect at a single point, with the intersection point being the midpoint of each support rod; all four support rods are of equal length.

[0091] The basic support unit is arranged perpendicular to the axial direction. When the transverse support unit includes multiple basic support units, the multiple basic support units are at the same height in the axial direction, and the endpoints of the four support rods of the basic support unit are connected to the endpoints of the four support rods of the adjacent basic support unit.

[0092] The ends of the four support rods that connect the basic support unit to the external thread blank are the support ends, and the support ends correspond to the grooves of the screw threads on the outer surface of the external thread.

[0093] Example 2:

[0094] The contents that are the same as in Example 1 will not be repeated here; the different aspects of this embodiment compared to Example 1 are as follows:

[0095] Another aspect of this embodiment provides a method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing, which further includes the following steps:

[0096] The endpoints of the four support rod blanks connecting the basic support unit blank and the external thread blank are the support endpoints, and some of the support endpoints correspond to the grooves of the screw threads on the outer surface of the external thread blank.

[0097] The ceramic screw blank has a length of L1; the ceramic screw blank has a diameter of d1; the support rod blank has a diameter of d0; and the transverse support unit blank includes n basic support unit blanks.

[0098] When L1≥100mm, d1≥8mm, d0≤L1×(16d1) -1 mm, n≥3;

[0099] When L1 < 100 mm, d1 < 8 mm, L1 × (16d1) -1 mm≤d0≤d1 / 4, n<3.

[0100] A first ceramic slurry is prepared, the first ceramic slurry comprising zirconium oxide powder and a first photosensitive resin in a volume ratio of 48:52;

[0101] The first photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1.5:1;

[0102] The first photocurable resin includes methoxy polyethylene glycol 400 acrylate;

[0103] The second photocurable resin includes one or two of pentaerythritol tetraacrylate.

[0104] A second ceramic slurry is prepared, the second ceramic slurry comprising zirconium oxide powder and a second photosensitive resin in a volume ratio of 59:52;

[0105] The second photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1:1.5;

[0106] The first photocurable resin includes methoxy polyethylene glycol 400 acrylate;

[0107] The second photocurable resin includes pentaerythritol tetraacrylate.

[0108] The distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 3.5 mm; the distance between the mold thread blank and the opposite screw thread blank is 3.5 mm.

[0109] Example 3:

[0110] The contents that are the same as in Example 1 will not be repeated here; the different aspects of this embodiment compared to Example 1 are as follows:

[0111] Another aspect of this embodiment provides a method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing, wherein a first ceramic slurry is prepared, the first ceramic slurry comprising zirconia powder and a first photosensitive resin in a volume ratio of 32:68.

[0112] The first photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 2.5:1;

[0113] The first photocurable resin includes N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate;

[0114] The second photocurable resin includes ethoxylated trimethylolpropane triacrylate and pentaerythritol tetraacrylate.

[0115] A second ceramic slurry is prepared, the second ceramic slurry comprising zirconium oxide powder and a second photosensitive resin in a volume ratio of 56:59;

[0116] The second photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1:2.5;

[0117] The first photocurable resin includes N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate;

[0118] The second photocurable resin includes ethoxylated trimethylolpropane triacrylate and pentaerythritol tetraacrylate.

[0119] The distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 1.5 mm; the distance between the mold thread blank and the opposite screw thread blank is 1.5 mm.

[0120] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, the above-described features have similar functions to (but are not limited to) those disclosed in this application.

Claims

1. A method for preparing lightweight, high thermal resistance zirconia ceramic screws using 3D printing, characterized in that, Includes the following steps: A first ceramic slurry is prepared, wherein the first ceramic slurry comprises zirconium oxide powder and a first photosensitive resin in a volume ratio of (30-50):(50-70); A second ceramic slurry is prepared, the second ceramic slurry comprising zirconium oxide powder and a second photosensitive resin in a volume ratio of (55-60):(50-60); The solid content of the first ceramic slurry is less than that of the second ceramic slurry; Ceramic screw blanks and ceramic mold blanks covering the outside of the ceramic screw blanks are prepared by 3D printing using the first ceramic slurry and the second ceramic slurry, respectively. The outer surface structure of the ceramic screw blank matches the inner surface structure of the ceramic mold blank; the distance between the outer surface of the ceramic screw blank and the inner surface of the ceramic mold blank is 0.5-5mm; The ceramic screw blank and the ceramic mold blank covering the ceramic screw blank are simultaneously degreased and degummed, and then sintered to obtain a lightweight, high thermal resistance zirconia ceramic screw and a ceramic mold covering the lightweight, high thermal resistance zirconia ceramic screw. By rotating the lightweight, high thermal resistance zirconia ceramic screw relative to the ceramic mold, the lightweight, high thermal resistance zirconia ceramic screw is separated from the ceramic mold, thus obtaining the lightweight, high thermal resistance zirconia ceramic screw. The ceramic screw blank includes an external thread blank and a screw body blank sleeved inside the external thread blank; The outer surface of the external thread blank is provided with a screw thread including a helical shape; the inner surface of the external thread blank is connected to the surface of the screw body blank. The screw body blank includes several transverse support unit blanks, which are arranged perpendicular to the axial direction; the several transverse support unit blanks are arranged in parallel and connected along the axial direction of the screw body blank; The transverse support unit blank includes one or more basic support unit blanks; The basic support unit blank is composed of 4 support rod blanks that intersect at a point, and the intersection point of the support rod blanks is the midpoint of each support rod blank; the 4 support rod blanks are of equal length; The basic support unit blank is arranged perpendicular to the axial direction. When the transverse support unit blank includes multiple basic support unit blanks, the multiple basic support unit blanks are at the same height in the axial direction, and the end points of the four support rod blanks of the basic support unit blank are connected to the end points of the four support rod blanks of the adjacent basic support unit blank. The endpoints of the four support rod blanks connecting the basic support unit blank and the external thread blank are the support endpoints, and some of the support endpoints correspond to the grooves of the screw threads on the outer surface of the external thread blank.

2. The method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing according to claim 1, characterized in that, The first photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of (1-3):1; The first photocurable resin includes one or both of N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate; The second photocurable resin includes one or two of ethoxytrimethylolpropane triacrylate and pentaerythritol tetraacrylate.

3. The method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing according to claim 1, characterized in that, The second photosensitive resin comprises a first photocurable resin and a second photocurable resin in a mass ratio of 1:(1-3); The first photocurable resin includes one or two of N-vinylcaprolactam and methoxy polyethylene glycol 400 acrylate; The second photocurable resin includes one or two of ethoxytrimethylolpropane triacrylate and pentaerythritol tetraacrylate.

4. The method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing according to claim 1, characterized in that, The ceramic screw blank has a length of L1; the ceramic screw blank has a diameter of d1; the support rod blank has a diameter of d0; and the transverse support unit blank includes n basic support unit blanks. When L1≥100mm, d1≥8mm, d0≤L1·(16d1) -1 mm, n≥3; When L1 < 100 mm, d1 < 8 mm, L1·(16d1) -1 mm≤d0≤d1 / 4, n<3.

5. The method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing according to claim 1, characterized in that, The ceramic mold blank includes a mold thread blank disposed on the inner surface of the mold blank, and the mold thread blank matches the screw thread blank of the external thread blank; The distance between the die thread blank and the opposite screw thread blank is 0.5-5mm.

6. The method for preparing lightweight, high thermal resistance zirconia ceramic screws by 3D printing according to claim 1, characterized in that, The protruding part of the mold thread is provided with a first through hole that penetrates radially along the ceramic mold blank, and the diameter of the first through hole is 0.1-0.5mm; The groove portion of the mold thread is provided with several second through holes arranged circumferentially, and the diameter of the second through holes is 0.1-0.5mm.

7. A method for 3D printing lightweight, high thermal resistance zirconia ceramic screws, characterized in that, The screw was prepared by the 3D printing method for preparing lightweight, high thermal resistance zirconia ceramic screws as described in any one of claims 1-6. The 3D-printed lightweight high thermal resistance zirconia ceramic screw includes an external thread and a screw body sleeved inside the external thread; the 3D-printed lightweight high thermal resistance zirconia ceramic screw is composed of a columnar part and a conical part along the axial direction, and the outer surfaces of both the columnar part and the conical part are provided with external threads, and the end of the columnar part away from the conical part is provided with a groove. The screw body includes several transverse support units, which are arranged perpendicular to the axial direction; the several transverse support units are arranged in parallel and connected along the axial direction of the screw body; The lateral support unit includes one or more basic support units; The basic support unit consists of four support rods that intersect at a single point, the intersection of which is the midpoint of each support rod; all four support rods are of equal length. The basic support unit is arranged perpendicular to the axial direction. When the transverse support unit includes multiple basic support units, the multiple basic support units are at the same height in the axial direction, and the endpoints of the four support rods of the basic support unit are connected to the endpoints of the four support rods of the adjacent basic support unit. The ends of the four support rods that connect the basic support unit to the external thread blank are the support ends, and the support ends correspond to the grooves of the screw threads on the outer surface of the external thread.

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