CN111957092A - Porous ceramic filter with controllable pore gradual change and preparation method thereof - Google Patents
Porous ceramic filter with controllable pore gradual change and preparation method thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 99
- 239000011148 porous material Substances 0.000 title claims abstract description 36
- 230000008859 change Effects 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 84
- 238000010146 3D printing Methods 0.000 claims abstract description 28
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 239000011268 mixed slurry Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 11
- 238000007639 printing Methods 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009991 scouring Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract description 2
- 238000011960 computer-aided design Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 239000008187 granular material Substances 0.000 description 4
- 238000005058 metal casting Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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Abstract
The invention discloses a porous ceramic filter with controllable pore gradual change and a preparation method thereof, wherein the porous ceramic filter adopts a variable gradient truss filtering structure with gradually changed pores, which is obtained by computer-aided design, adopts prepared photosensitive resin-ceramic powder mixed slurry and is formed by 3D printing. The node distribution density of each level of the porous ceramic filter is gradually increased according to the level sequence from top to bottom, and the volume of the three-dimensional holes corresponding to each level is gradually reduced according to the level sequence from top to bottom, so that the filtering effect of graded filtering and difficult blockage can be achieved. In addition, the gradient-variable truss filtering structure is composed of double inverted pyramid unit strut structures, and the next-layer double inverted pyramid unit strut structure plays a role in strengthening and supporting the previous-layer double inverted pyramid unit strut structure, so that the anti-scouring performance of the porous ceramic filter is improved.
Description
Technical Field
The invention relates to the technical field of porous ceramics, in particular to a porous ceramic filter with controllable pore gradual change and a preparation method thereof.
Background
In the field of metal casting, impurities in molten metal have important influence on various properties of metal castings, such as mechanical properties and the like. In order to obtain metal castings with high performance requirements, it is necessary to make a contrivance to reduce the content of impurities in the molten metal. Therefore, as the requirements of people on the performance of casting products are increased, the removal of impurities in molten metal is concerned and researched by more and more scholars.
Among various methods for removing impurities, the porous ceramic filter has the characteristics of large filtering area, thermal shock resistance, chemical stability, metal erosion resistance and high filtering efficiency, so that the porous ceramic filter is regarded as a novel efficient filter in the metal melt filtering and purifying technology, and is widely applied to the field of metal liquid purification and filtration at present. Porous ceramics can also be subdivided into granular ceramic sintered bodies, foamed ceramics and honeycomb ceramics according to the pore structure, and the latter two applications are many.
Although the foamed ceramic filter has a good filtering effect, the foamed ceramic filter has low high-temperature strength and poor impact resistance, and the structure can be damaged and enter molten metal to cause secondary pollution due to long-time impact of the molten metal at high temperature; in addition, the uneven pores cannot fully exert the filtering function of each filtering hole; furthermore, there are disconnected pores in the ceramic foam, which can cause molten metal to remain. These drawbacks limit their widespread use in the field of metal casting.
Compared with foamed ceramic, the honeycomb ceramic has the characteristics of high thermal shock resistance and high sintering and casting temperature resistance, the balance between flow and strength is ensured by the straight hole design, and molten metal can be effectively filtered. However, the straight hole design limits the size of the filtered impurities. When the diameter of the micropore is designed to be too large, only impurity particles with larger particle size can be filtered, and impurity particles with smaller particle size can escape from the micropore; when the diameter is too small, the pore channel is quickly blocked by larger impurity particles, and the filtering effect is greatly reduced. In addition, the simpler hole type design has limited capability of changing the motion trail of impurity particles, which results in low removal rate of the impurities.
Disclosure of Invention
The first purpose of the present invention is to overcome the disadvantages and shortcomings of the prior art, and to provide a porous ceramic filter with gradually-controlled pore size, which can realize graded filtration, is not easy to block, and is resistant to scouring.
The second purpose of the invention is to provide a method for preparing a porous ceramic filter with controllable pore gradual change, which can rapidly and accurately prepare the porous ceramic filter with controllable pore gradual change.
The first purpose of the invention is realized by the following technical scheme: a porous ceramic filter with controllable pore gradual change comprises an outer wall of the porous ceramic filter and a porous ceramic gradient-changing truss filtering structure positioned in the outer wall of the porous ceramic filter, wherein the gradient-changing truss filtering structure is divided into a plurality of levels, the truss filtering structure of each level is composed of a plurality of double inverted pyramid unit strut structures, the volume of the double inverted pyramid unit strut structure of the next level is smaller than that of the double inverted pyramid unit strut structure of the previous level, and the double inverted pyramid unit strut structures of the next level are connected with and support the same double inverted pyramid unit strut structure of the previous level;
the end points of each double inverted pyramid unit strut structure are used as nodes of the truss filtering structure, the distribution density of the nodes of each level is gradually increased according to the level sequence from top to bottom, and the volume of the three-dimensional holes corresponding to each level is gradually reduced according to the level sequence from top to bottom.
Preferably, the double-inverted pyramid unit strut structure is composed of four truss rods, the four truss rods are arranged according to a spatial diagonal of a cube and distributed in a circumferential array, and the inclination angle of each truss rod is not more than 45 degrees; the four truss rods are mutually intersected, and a unique node is arranged at the position of one third of the length of each truss rod.
Preferably, each double inverted pyramid unit pillar structure is connected with an adjacent double inverted pyramid unit pillar structure in the same level through a node; in addition to the lowest-level truss filtering structure, in the truss filtering structure of any level, each lower end node of each double inverted pyramid unit supporting column structure is connected with four upper end nodes of the double inverted pyramid unit supporting column structure belonging to the next level.
Preferably, the porous ceramic filter is further provided with a quadrilateral truss structure below the truss filtering structure at the lowest layer, the quadrilateral truss structure is provided with a plurality of quadrilateral truss structure units, and a plurality of lower end nodes of the truss filtering structure at the lowest layer are connected through the quadrilateral truss structure units.
Furthermore, the plurality of quadrilateral truss structure units are arranged in a two-dimensional array, and the double-inverted pyramid unit strut structures of each level are arranged in a two-dimensional array.
Furthermore, the porous ceramic filter is made of photosensitive resin-ceramic powder mixed slurry, and the outer wall of the filter, the porous ceramic gradient truss filtering structure and the quadrilateral truss structure are integrally formed in a 3D printing mode.
Preferably, the volume of the truss filtering structure of each layer is gradually reduced in a geometric multiple relation from top to bottom, and the node density of each layer is gradually increased in the same geometric multiple relation from top to bottom.
Furthermore, the total layer number of the gradient-variable truss filtering structure is at least three layers; the volume of the double inverted pyramid unit pillar structure of the next level is reduced to one eighth of the volume of the double inverted pyramid unit pillar structure of the previous level through three-dimensional equiaxial reduction, and the node density of the next level is eight times of the node density of the previous level.
The second purpose of the invention is realized by the following technical scheme: a method for preparing a porous ceramic filter with controllable pore gradual change, which is suitable for the precise and rapid printing of a variable gradient truss filter structure capable of being designed in a parameterization way, and comprises the following steps:
s1, designing a three-dimensional model of the double-inverted pyramid unit strut structure by using design software according to actual use requirements, and constructing a layer of truss filtering structure according to a two-dimensional array arrangement mode;
s2, reducing the volume of the truss filtering structure of the layer, and constructing the truss filtering structure of the next layer according to the arrangement mode of a two-dimensional array;
s3, repeating the operation of the step S2 to increase the number of the truss layers according to the actual filtering requirement, so as to construct a three-dimensional model of the variable gradient truss filtering structure;
s4, aiming at the lowest truss filtering structure of the variable gradient truss filtering structure, connecting the lower ends of the lowest truss filtering structure through quadrilateral trusses to further strengthen the variable gradient truss filtering structure;
s5, establishing a three-dimensional model of the outer wall of the filter according to actual use requirements, and combining the three-dimensional model with the three-dimensional model of the variable gradient truss filtering structure, thereby establishing a three-dimensional model of the porous filter with controllable pore gradual change;
s6, storing the porous filter model into an STL format, and slicing the porous filter three-dimensional model by using slicing software to obtain a porous structure slice file;
s7, preparing ceramic slurry suitable for 3D printing according to actual requirements of use strength, heat resistance and micro porosity;
s8, importing the porous structure slice file into a 3D printer, and printing layer by combining the ceramic slurry obtained in the step S7 to obtain a porous ceramic filter blank;
and S9, cleaning, drying, degreasing and sintering the porous ceramic filter blank printed in the step S8 to obtain the final porous ceramic filter with controllable gradually-changed pores.
Preferably, the design software includes, but is not limited to, Rhino, solidworks, UG;
the 3D printing method comprises but is not limited to a digital optical processing ceramic 3D printing method, a laser selective sintering ceramic 3D printing method, a laser selective melting ceramic 3D printing method and a stereolithography ceramic 3D printing method;
the ceramic slurry suitable for 3D printing is a composite slurry formed by fully mixing alumina ceramic and photosensitive resin.
Compared with the prior art, the invention has the following advantages and effects:
(1) the porous ceramic filter adopts a variable gradient truss filtering structure, the distribution density of the nodes of the layers is gradually increased according to the sequence of the layers from top to bottom, and the volume of the three-dimensional hole corresponding to each layer is gradually reduced from top to bottom, so that the pore change of the porous filter is realized, and the purpose of graded filtering is achieved. The aperture that first layer truss filtration formed is great, can be used for filtering great foreign matter granule, and along with node density top-down gradual change in each level increases, filterable foreign matter granule size also diminishes progressively step by step, consequently can filter multiple aperture size foreign matter granule, has compensatied the limited defect of traditional porous ceramic filter filtration foreign matter granule diameter.
(2) The porous ceramic filter is not easy to block. Each level can filter the impurity particle of corresponding volume size by the truss filtration that two inverted pyramid unit strut structures constitute, and great volume impurity particle is adsorbed at last level filtration, and less volume impurity particle is adsorbed at the level down, consequently filters aperture distribution range and gradient size according to the reasonable design of impurity particle that contains, just can prevent to block up in effective filterable.
(3) In the design of the variable gradient truss filtering structure, the next-stage double inverted pyramid unit pillar structure provides support for the previous-stage double inverted pyramid unit pillar structure, so that the support strength of the filtering structure is strengthened, and the molten metal impact resistance of the filter is effectively improved.
(4) According to the invention, the porous ceramic filter with the controllable gradually-changed pores is prepared by the 3D printing method, so that the volume precision of a molding structure is ensured, the excellent performance of the filter is ensured, the rapid printing is realized, the cost is saved, and the popularization is facilitated.
Drawings
FIG. 1 is an isometric view of a porous ceramic filter of the present invention with controlled pore progression from the bottom down.
Fig. 2 is a bottom view of the porous ceramic filter of fig. 1.
FIG. 3 is an isometric view of the porous ceramic filter of FIG. 1 from the bottom side up.
FIG. 4 is a top view of the porous ceramic filter of FIG. 1.
Fig. 5 is a cross-sectional view of the porous ceramic filter of fig. 1.
FIG. 6 is an isometric view of a double inverted pyramid unit strut structure.
Fig. 7 is a front view of a double inverted pyramid unit pillar structure.
Fig. 8 is an isometric view of a quadrilateral truss structure.
FIG. 9 is a flow chart of the method of making a porous ceramic filter with controlled pore transition according to the present invention.
Wherein, 1-a double inverted pyramid unit pillar structure; 11-a double inverted pyramid unit pillar structure in a first level; 12-a double inverted pyramid unit pillar structure in the second level; 2-a unique node in a double inverted pyramid unit strut structure; 21-a node where four truss rods of a double inverted pyramid unit strut structure intersect in a first level; 3-a node; 4-a quadrilateral truss structure; 41-quadrilateral truss structural units; 5-outer wall of filter.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
The embodiment discloses a porous ceramic filter with controllable pore gradual change, and as shown in fig. 1 to 4, the porous ceramic filter comprises a porous ceramic filter outer wall 5 and a porous ceramic gradient truss filtering structure positioned in the porous ceramic filter outer wall.
As shown in fig. 5, the gradient-variable truss filtering structure is divided into a plurality of levels, and in this embodiment, the total level number of the gradient-variable truss filtering structure can be set to at least three levels. The truss filtering structure of each level is composed of a plurality of double inverted pyramid unit supporting column structures 1, and the double inverted pyramid unit supporting column structures of each level are arranged in a two-dimensional array.
As shown in fig. 6 and 7, the double-inverted pyramid unit pillar structure is composed of four truss rods, the four truss rods are arranged according to the spatial diagonal of a cube and distributed in a circumferential array, the inclination angle of each truss rod is not greater than 45 degrees, and no additional support or support removal process is needed when 3D printing is performed. The four truss rods are mutually intersected, and a unique node 2 is arranged at the position of one third of the length of each truss rod. For example, in fig. 1, 2 and 5, four truss rods in the first level double inverted pyramid unit strut structure 11 intersect at a node 21.
As shown in fig. 5, the volume of the dual inverted pyramid unit pillar structure of the next level is smaller than that of the dual inverted pyramid unit pillar structure of the previous level. The end point of each double inverted pyramid unit strut structure is used as a node 3 of the truss filtering structure, and each double inverted pyramid unit strut structure is connected with the adjacent double inverted pyramid unit strut structures in the same level through the nodes. The node distribution density of each level is gradually increased according to the level sequence from top to bottom, and the volume of the three-dimensional holes corresponding to each level is gradually reduced according to the level sequence from top to bottom, so that the pore change of the porous filter is realized to achieve the graded filtration.
In this embodiment, the volume of the truss filtering structure of each level decreases from top to bottom in geometric multiple, and the node density of each level increases from top to bottom in the same geometric multiple, for example, the volume of the double inverted pyramid unit pillar structure of the next level decreases to one eighth of the volume of the double inverted pyramid unit pillar structure of the previous level by three-dimensional equiaxial, and correspondingly, the node density of the next level is eight times of the node density of the previous level.
A plurality of next-level double inverted pyramid unit strut structures connect and support the same previous-level double inverted pyramid unit strut structure, and specifically, in addition to the lowest-level truss filtering structure, in any level of truss filtering structure, each lower end node of each double inverted pyramid unit strut structure is connected to four upper end nodes of the double inverted pyramid unit strut structure belonging to the next level, for example, the second-level double inverted pyramid unit strut structure 12 provides support for the first-level double inverted pyramid unit strut structure 11 through the node 3.
As shown in fig. 3, 4 and 5, the porous ceramic filter is further provided with a quadrangular truss structure 4 having a plurality of quadrangular truss structure units 41, which can be seen in fig. 8, below the lowermost truss filter structure. A plurality of quadrangle truss structure units are arranged in a two-dimensional array. A plurality of lower extreme nodes of the truss filtration structure of the lowest level are connected through the quadrilateral truss structure units, so that the structural strength of the truss filtration structure of the lowest level is ensured.
The porous ceramic filter can be made of photosensitive resin-ceramic powder mixed slurry such as alumina ceramic and photosensitive resin composite slurry, and the outer wall of the filter, the porous ceramic gradient truss filtering structure and the quadrilateral truss structure can be integrally formed in a 3D printing mode.
Example 2
The embodiment discloses a method for preparing a porous ceramic filter with controllable pore gradual change, which is suitable for accurate and rapid printing of a variable gradient truss filtering structure with a parameterizable design, and the porous ceramic filter in the embodiment 1 is prepared, as shown in fig. 9, by the following steps:
s1, designing a three-dimensional model of the double-inverted pyramid unit strut structure by utilizing the Rhino design software according to actual use requirements, and constructing a layer of truss filtering structure according to a two-dimensional array arrangement mode; of course, in other embodiments, other design software such as solidworks, UG;
s2, reducing the volume of the truss filtering structure of the layer, wherein the volume of the truss filtering structure of the layer is specifically reduced to one eighth of the original volume through three-dimensional isometric, and then constructing the truss filtering structure of the next layer according to the arrangement mode of a two-dimensional array;
s3, repeating the operation of the step S2 to increase the number of the truss layers according to the actual filtering requirement, so as to construct a three-dimensional model of the variable gradient truss filtering structure; as shown in fig. 5, the total number of layers of the truss of this embodiment is four;
s4, aiming at the lowest truss filtering structure of the variable gradient truss filtering structure, connecting the lower ends of the lowest truss filtering structure through quadrilateral trusses which are arranged in a two-dimensional array, and further strengthening the variable gradient truss filtering structure;
s5, establishing a three-dimensional model of the outer wall of the filter according to actual use requirements, and combining the three-dimensional model of the outer wall of the filter with the three-dimensional model of the variable gradient truss filtering structure by methods such as Boolean operation, combination and the like, so as to establish a three-dimensional model of the porous filter with controllable pore gradual change;
s6, storing the porous filter model into an STL format, and slicing the porous filter three-dimensional model by using slicing software to obtain a porous structure slice file;
s7, preparing ceramic slurry suitable for 3D printing according to actual requirements of use strength, heat resistance, micro porosity and the like;
s8, importing the porous structure slice file into a 3D printer, and printing layer by combining the ceramic slurry obtained in the step S7 to obtain a porous ceramic filter blank;
and S9, cleaning, drying, degreasing and sintering the porous ceramic filter blank printed in the step S8 to obtain the final porous ceramic filter with controllable gradually-changed pores.
Here, the ceramic paste suitable for 3D printing is a composite paste in which alumina ceramic and a photosensitive resin are sufficiently mixed. The 3D printing adopts a digital light processing ceramic 3D printing method, and of course, in other embodiments, other 3D printing methods such as selective laser sintering ceramic 3D printing, selective laser melting ceramic 3D printing, and stereolithography ceramic 3D printing may also be adopted.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A porous ceramic filter with controllable pore gradual change is characterized by comprising an outer wall of the porous ceramic filter and a porous ceramic gradient-changing truss filtering structure positioned in the outer wall of the porous ceramic filter, wherein the gradient-changing truss filtering structure is divided into a plurality of levels, the truss filtering structure of each level is composed of a plurality of double inverted pyramid unit strut structures, the volume of the double inverted pyramid unit strut structure of the next level is smaller than that of the double inverted pyramid unit strut structure of the previous level, and the double inverted pyramid unit strut structures of the next level are connected with and support the same double inverted pyramid unit strut structure of the previous level;
the end points of each double inverted pyramid unit strut structure are used as nodes of the truss filtering structure, the distribution density of the nodes of each level is gradually increased according to the level sequence from top to bottom, and the volume of the three-dimensional holes corresponding to each level is gradually reduced according to the level sequence from top to bottom.
2. The porous ceramic filter with controlled pore transition according to claim 1, wherein the double inverted pyramid unit strut structure is composed of four truss rods, the four truss rods are arranged according to a spatial diagonal of a cube and distributed in a circumferential array, and an inclination angle of each truss rod is not more than 45 °; the four truss rods are mutually intersected, and a unique node is arranged at the position of one third of the length of each truss rod.
3. The porous ceramic filter with controlled pore transition of claim 1, wherein each double inverted pyramid unit pillar structure connects adjacent double inverted pyramid unit pillar structures in the same level by a node; in addition to the lowest-level truss filtering structure, in the truss filtering structure of any level, each lower end node of each double inverted pyramid unit supporting column structure is connected with four upper end nodes of the double inverted pyramid unit supporting column structure belonging to the next level.
4. The porous ceramic filter with the controllable gradually-changed pores according to claim 1, wherein the porous ceramic filter is further provided with a quadrilateral truss structure below the truss filter structure at the lowest layer, the quadrilateral truss structure is provided with a plurality of quadrilateral truss structure units, and a plurality of lower end nodes of the truss filter structure at the lowest layer are connected through the quadrilateral truss structure units.
5. The porous ceramic filter with controlled pore transition according to claim 4, wherein the plurality of quadrilateral truss structure units are arranged in a two-dimensional array, and the double inverted pyramid unit strut structures of each level are arranged in a two-dimensional array.
6. The porous ceramic filter with the controlled pore gradual change according to claim 4, wherein the porous ceramic filter is made of photosensitive resin-ceramic powder mixed slurry, and the outer wall of the filter, the porous ceramic gradient truss filter structure and the quadrilateral truss structure are integrally formed by means of 3D printing.
7. The porous ceramic filter with controlled pore transition as claimed in claim 1, wherein the truss filter structure volume of each layer decreases from top to bottom in geometric multiple relation, and the node density of each layer increases from top to bottom in same geometric multiple relation.
8. The porous ceramic filter with controlled pore gradual change of claim 7, wherein the total layer number of the gradient truss filtering structure is at least three layers; the volume of the double inverted pyramid unit pillar structure of the next level is reduced to one eighth of the volume of the double inverted pyramid unit pillar structure of the previous level through three-dimensional equiaxial reduction, and the node density of the next level is eight times of the node density of the previous level.
9. A preparation method of a porous ceramic filter with controllable pore gradual change is characterized in that the method is suitable for the precise and rapid printing of a variable gradient truss filter structure which can be designed in a parameterization mode, and comprises the following steps:
s1, designing a three-dimensional model of the double-inverted pyramid unit strut structure by using design software according to actual use requirements, and constructing a layer of truss filtering structure according to a two-dimensional array arrangement mode;
s2, reducing the volume of the truss filtering structure of the layer, and constructing the truss filtering structure of the next layer according to the arrangement mode of a two-dimensional array;
s3, repeating the operation of the step S2 to increase the number of the truss layers according to the actual filtering requirement, so as to construct a three-dimensional model of the variable gradient truss filtering structure;
s4, aiming at the lowest truss filtering structure of the variable gradient truss filtering structure, connecting the lower ends of the lowest truss filtering structure through quadrilateral trusses to further strengthen the variable gradient truss filtering structure;
s5, establishing a three-dimensional model of the outer wall of the filter according to actual use requirements, and combining the three-dimensional model with the three-dimensional model of the variable gradient truss filtering structure, thereby establishing a three-dimensional model of the porous filter with controllable pore gradual change;
s6, storing the porous filter model into an STL format, and slicing the porous filter three-dimensional model by using slicing software to obtain a porous structure slice file;
s7, preparing ceramic slurry suitable for 3D printing according to actual requirements of use strength, heat resistance and micro porosity;
s8, importing the porous structure slice file into a 3D printer, and printing layer by combining the ceramic slurry obtained in the step S7 to obtain a porous ceramic filter blank;
and S9, cleaning, drying, degreasing and sintering the porous ceramic filter blank printed in the step S8 to obtain the final porous ceramic filter with controllable gradually-changed pores.
10. The method of claim 9, wherein the design software includes but is not limited to Rhino, solidworks, UG;
the 3D printing method comprises but is not limited to a digital optical processing ceramic 3D printing method, a laser selective sintering ceramic 3D printing method, a laser selective melting ceramic 3D printing method and a stereolithography ceramic 3D printing method;
the ceramic slurry suitable for 3D printing is a composite slurry formed by fully mixing alumina ceramic and photosensitive resin.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114230337A (en) * | 2021-12-14 | 2022-03-25 | 山东常林铸业有限公司 | Ceramic filter for casting based on 3D printing and preparation method thereof |
| CN115040936A (en) * | 2022-04-29 | 2022-09-13 | 山东大学 | Ceramic filter element with variable porosity based on 3D printing and design and preparation method |
| CN115206558A (en) * | 2022-07-07 | 2022-10-18 | 中国核动力研究设计院 | Fuel assembly lower tube seat based on multilayer staggered lattice structure, filter body and application |
| CN116693318A (en) * | 2023-04-17 | 2023-09-05 | 四川大学 | Multi-structure reinforced personalized calcium phosphate ceramic structure, preparation method and application |
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2020
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230337A (en) * | 2021-12-14 | 2022-03-25 | 山东常林铸业有限公司 | Ceramic filter for casting based on 3D printing and preparation method thereof |
| CN115040936A (en) * | 2022-04-29 | 2022-09-13 | 山东大学 | Ceramic filter element with variable porosity based on 3D printing and design and preparation method |
| CN115206558A (en) * | 2022-07-07 | 2022-10-18 | 中国核动力研究设计院 | Fuel assembly lower tube seat based on multilayer staggered lattice structure, filter body and application |
| CN115206558B (en) * | 2022-07-07 | 2024-04-19 | 中国核动力研究设计院 | Fuel assembly lower tube seat based on multilayer staggered lattice structure, filter body and application |
| CN116693318A (en) * | 2023-04-17 | 2023-09-05 | 四川大学 | Multi-structure reinforced personalized calcium phosphate ceramic structure, preparation method and application |
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