CN112620582A - SiC combined Al for 3D printing2O3Method for preparing sand mould - Google Patents
SiC combined Al for 3D printing2O3Method for preparing sand mould Download PDFInfo
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- CN112620582A CN112620582A CN202011527144.4A CN202011527144A CN112620582A CN 112620582 A CN112620582 A CN 112620582A CN 202011527144 A CN202011527144 A CN 202011527144A CN 112620582 A CN112620582 A CN 112620582A
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- sand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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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
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Composite Materials (AREA)
- Structural Engineering (AREA)
Abstract
The invention relates to the field of refractory materials, in particular to SiC combined Al for 3D printing2O3A method for preparing a sand mould. The method uses Al2O3And preparing powder which can be directly used by the laser sintering 3D printing equipment by using the sand-quality mold particles, the curing agent resin and graphite. And (3) carrying out rapid molding on the high-precision sand mold by adopting a laser 3D printer in a layered printing mode. Silica sol is adopted for high-precision Al2O3And (5) performing infiltration treatment on the sand-quality mold. Sintering the dried high-precision sand mold in a reducing atmosphere to obtain SiC-bonded Al2O3And (4) sand quality mould.
Description
Technical Field
The invention relates to a medicineThe field of fire material preparation, in particular to SiC combined Al for 3D printing2O3A method for preparing a sand mould.
Background
Al2O3The complex sand mold is generally applied to the high-temperature casting industry and has high low-temperature strength; the hardening speed is high; good high-temperature collapsibility and the like. However, with the gradual improvement of the casting quality requirement of the casting industry, Al2O3The sand mould with complex texture and the preparation process thereof become more rigorous, and Al2O3The complexity of the sand-sand mold becomes higher and higher, and the overall quality of the casting is further influenced. The concrete expression is as follows: (1) al (Al)2O3The design of the sand mould is complex, and more advanced forming means is required; (2) al (Al)2O3The binder (resin) of the sand mould has insufficient bonding strength under the condition of medium temperature, so that the sand mould is collapsed at lower temperature and the quality of a casting is reduced; (3) al (Al)2O3The problems that the porosity of the sand mould is too large due to factors such as the forming process, the grain composition of the sand mould and the like, the surface roughness of a casting is influenced and the like are to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides SiC combined Al for 3D printing, which is convenient to form and high in strength2O3Method for preparing sand mould, the method uses Al2O3And preparing powder which can be directly used by the laser sintering 3D printing equipment by using the sand-quality mold particles, the curing agent resin and graphite. And (3) carrying out rapid molding on the high-precision sand mold by adopting a laser 3D printer in a layered printing mode. Silica sol is adopted for high-precision Al2O3And (5) performing infiltration treatment on the sand-quality mold. Sintering the dried high-precision sand mold in a reducing atmosphere to obtain SiC-bonded Al2O3And (4) sand quality mould.
In order to achieve the purpose, the invention is realized by the following technical scheme:
SiC combined Al for 3D printing2O3The preparation method of the sand mould is characterized by comprising the following specific operation steps:
(1) mixing 90-96 parts by weight of alumina powder, 3-5 parts by weight of polyamide resin powder and 1-3 parts by weight of graphite powder, placing the mixture in a drum mixer, and stirring for 6-12 hours to obtain powder for 3D printing equipment;
(2) using SolidWorks software to create a three-dimensional model of the sand mold;
(3) slicing the created sand mold three-dimensional model by using Simplify 3D software, wherein the printing parameters are set to be laser power 6w, scanning speed is 1000-;
(4) putting the powder which is obtained in the step (1) and can be used by the 3D printing equipment into a powder bin of the 3D printing equipment, and operating the 3D printing equipment to read the slice file processed in the step (3) for 3D printing and forming to obtain a biscuit of the 3D printing sand mold matrix;
(5) placing the 3D printing sand mold matrix biscuit in a 500-600 ℃ medium temperature furnace for 1-3 hours to obtain a sand mold matrix biscuit after glue discharging;
(6) then, immersing the biscuit of the sand mold matrix after glue discharging into silica sol with the concentration of 20-50% in vacuum equipment, wherein the internal pressure of the vacuum equipment is 0.1-1MPa, taking out after 6-12 hours of infiltration, and drying for 12-24 hours at the temperature of 100-150 ℃ to obtain a dried biscuit of the sand mold matrix;
(7) the dried sand mold matrix biscuit is cooled along with the furnace after being buried and sintered for 1 to 6 hours at the temperature of 1400 ℃ and 1600 ℃ to obtain SiC combined Al2O3And (4) sand quality mould.
The alumina powder used in the step (1) has an average particle size of 40 μm and Al2O3The content is 99.9%; the polyamide resin powder has an average particle diameter of 10 μm and a content of 99%; the average grain diameter of the graphite powder is 40 mu m, and the content is 99.9 percent.
In the step (6), the silica sol is industrial alkaline silica sol, the mass fraction of the silica is 20-50%, and the particle size is 7-10 nm.
Compared with the prior art, the invention has the beneficial effects that: 1) the complex sand mold is designed and printed in a 3D printing mode, so that the effect of quickly forming the complex sand mold is realized; 2) by using Al2O3Modification technology of sand-quality resin to realize modified Al2O3Laser printing characteristics of the sand-sand mold; 3) preparing SiC combined Al by using the porous characteristic of a complex sand mold and by using a silica sol infiltration process and a reducing atmosphere sintering process2O3The medium-temperature strength of the sand mold is improved, and the quality of the casting is guaranteed.
Drawings
Fig. 1 is a three-dimensional model picture in embodiment 1 of the present invention.
Fig. 2 is a three-dimensional model picture in embodiment 2 of the present invention.
Fig. 3 is a three-dimensional model picture in embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
SiC combined Al for 3D printing2O3The preparation method of the sand mould comprises the following specific operation steps:
(1) 96g of Al having an average particle diameter of 40 μm2O3Mixing 99.9% alumina powder, 3g of polyamide resin powder with the average particle size of 10 microns and 99% polyamide resin powder with the average particle size of 1g of graphite powder with the average particle size of 40 microns and the content of 99.9%, placing the mixture in a drum mixer, and stirring for 12 hours to obtain powder for 3D printing equipment;
(2) using SolidWorks software to create a three-dimensional model of the sand mold;
(3) slicing the created sand mold three-dimensional model by using Simplify 3D software, wherein the printing parameters are set to be laser power 6w, the scanning speed is 1500mm/s, the thickness of a powder layer is 0.12mm, the scanning distance is 0.15mm, and the preheating temperature is 140 ℃;
(4) putting the powder which is obtained in the step (1) and can be used by the 3D printing equipment into a powder bin of the 3D printing equipment, and operating the 3D printing equipment to read the slice file processed in the step (3) for 3D printing and forming to obtain a biscuit of the 3D printing sand mold matrix;
(5) placing the 3D printing sand mold matrix biscuit in a 500 ℃ medium temperature furnace for 3 hours to obtain a sand mold matrix biscuit after binder removal;
(6) then, immersing the biscuit of the sand mold matrix after glue discharging into industrial alkaline silica sol (the mass fraction of silicon dioxide is 20 percent, and the particle size is 10 nm) with the concentration of 20 percent in vacuum equipment, wherein the internal pressure of the vacuum equipment is 0.1MPa, taking out the biscuit after impregnating for 6 hours, and drying for 12 hours at the temperature of 110 ℃ to obtain a dried biscuit of the sand mold matrix;
(7) the dried sand mold matrix biscuit is cooled along with the furnace after being buried and sintered for 3 hours at 1500 ℃, thus obtaining SiC combined Al2O3And (4) sand quality mould.
Phase analysis of the samples was performed according to GB/T8759-1988; the room temperature compressive strength of the samples was measured in accordance with GB/T5072-2008. 3D printed SiC bound Al prepared in this example2O3The main crystal phase of the sand-quality mold is corundum and SiC, and the normal-temperature compressive strength is 88.5 MPa.
Example 2
SiC combined Al for 3D printing2O3The preparation method of the sand mould comprises the following specific operation steps:
(1) 188g of Al having an average particle diameter of 40 μm2O3Mixing 99.9% alumina powder, 8g of polyamide resin powder with the average particle size of 10 microns and 99% polyamide resin powder with the average particle size of 4g of graphite powder with the average particle size of 40 microns and the content of 99.9%, placing the mixture in a drum mixer, and stirring for 12 hours to obtain powder for 3D printing equipment;
(2) using SolidWorks software to create a three-dimensional model of the sand mold;
(3) slicing the created sand mold three-dimensional model by using Simplify 3D software, wherein the printing parameters are set to be laser power 6w, the scanning speed is 1500mm/s, the thickness of a powder layer is 0.1mm, the scanning distance is 0.12mm, and the preheating temperature is 140 ℃;
(4) putting the powder which is obtained in the step (1) and can be used by the 3D printing equipment into a powder bin of the 3D printing equipment, and operating the 3D printing equipment to read the slice file processed in the step (3) for 3D printing and forming to obtain a biscuit of the 3D printing sand mold matrix;
(5) placing the 3D printing sand mold matrix biscuit in a 600 ℃ medium temperature furnace for 2.5 hours to obtain a sand mold matrix biscuit after binder removal;
(6) then, immersing the biscuit of the sand mold matrix after glue discharging into industrial alkaline silica sol (the mass fraction of silicon dioxide is 20 percent and the particle size is 10 nm) with the concentration of 30 percent in vacuum equipment, wherein the internal pressure of the vacuum equipment is 0.1MPa, taking out the biscuit after impregnating for 7 hours, and drying for 12 hours at the temperature of 120 ℃ to obtain a dried biscuit of the sand mold matrix;
(7) the dried sand mold matrix biscuit is cooled along with the furnace after being buried and sintered for 4 hours at 1500 ℃, thus obtaining SiC combined Al2O3And (4) sand quality mould.
Phase analysis of the samples was performed according to GB/T8759-1988; the room temperature compressive strength of the samples was measured in accordance with GB/T5072-2008. 3D printed SiC bound Al prepared in this example2O3The main crystal phase of the sand-quality mold is corundum and SiC, and the normal-temperature compressive strength is 93.4 MPa.
Example 3
SiC combined Al for 3D printing2O3The preparation method of the sand mould comprises the following specific operation steps:
(1) 184g of Al having an average particle diameter of 40 μm2O3Mixing 99.9% alumina powder, 10g of polyamide resin powder with the average particle size of 10 microns and the content of 99% and 6g of graphite powder with the average particle size of 40 microns and the content of 99.9%, placing the mixture in a drum mixer, and stirring for 12 hours to obtain powder for 3D printing equipment;
(2) using SolidWorks software to create a three-dimensional model of the sand mold;
(3) slicing the created sand mold three-dimensional model by using Simplify 3D software, wherein the printing parameters are set to be laser power 6w, the scanning speed is 1500mm/s, the thickness of a powder layer is 0.1mm, the scanning distance is 0.12mm, and the preheating temperature is 140 ℃;
(4) putting the powder which is obtained in the step (1) and can be used by the 3D printing equipment into a powder bin of the 3D printing equipment, and operating the 3D printing equipment to read the slice file processed in the step (3) for 3D printing and forming to obtain a biscuit of the 3D printing sand mold matrix;
(5) placing the 3D printing sand mold matrix biscuit in a 600 ℃ medium temperature furnace for 3 hours to obtain a sand mold matrix biscuit after binder removal;
(6) then, immersing the biscuit of the sand mold matrix after glue discharging into industrial alkaline silica sol (the mass fraction of silicon dioxide is 20 percent and the particle size is 10 nm) with the concentration of 40 percent in vacuum equipment, wherein the internal pressure of the vacuum equipment is 0.1MPa, taking out the biscuit after the impregnation for 8 hours, and drying the biscuit for 12 hours at the temperature of 120 ℃ to obtain a dried biscuit of the sand mold matrix;
(7) the dried sand mold matrix biscuit is cooled along with the furnace after being buried and sintered for 5 hours at 1600 ℃ to obtain SiC combined Al2O3And (4) sand quality mould.
Phase analysis of the samples was performed according to GB/T8759-1988; the room temperature compressive strength of the samples was measured in accordance with GB/T5072-2008. 3D printed SiC bound Al prepared in this example2O3The main crystal phase of the sand-quality mold is corundum and SiC, and the normal-temperature compressive strength is 98.1 MPa.
The embodiment shows that the invention successfully prepares the zirconia-mullite complex phase porous high-strength refractory blocks with different pore shapes and sizes can realize the design of the product porosity so as to meet different use requirements; the block body adopts a sol infiltration firing process to promote sintering, so that the strength of the block body is obviously improved, and the block body is not easy to damage in use; the use performance of the complex sand mold for 3D printing is improved by reasonable compounding of the alumina and the silicon carbide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. SiC combined Al for 3D printing2O3The preparation method of the sand mould is characterized by comprising the following specific operation steps:
(1) mixing 90-96 parts by weight of alumina powder, 3-5 parts by weight of polyamide resin powder and 1-3 parts by weight of graphite powder, placing the mixture in a drum mixer, and stirring for 6-12 hours to obtain powder for 3D printing equipment;
(2) using SolidWorks software to create a three-dimensional model of the sand mold;
(3) slicing the created sand mold three-dimensional model by using Simplify 3D software, wherein the printing parameters are set to be laser power 6w, scanning speed is 1000-;
(4) putting the powder which is obtained in the step (1) and can be used by the 3D printing equipment into a powder bin of the 3D printing equipment, and operating the 3D printing equipment to read the slice file processed in the step (3) for 3D printing and forming to obtain a biscuit of the 3D printing sand mold matrix;
(5) placing the 3D printing sand mold matrix biscuit in a medium temperature furnace at 500-600 ℃ for 1-3 hours to obtain a sand mold matrix biscuit after glue discharging;
(6) then, immersing the biscuit of the sand mold matrix after glue discharging into silica sol with the concentration of 20-50% in vacuum equipment, wherein the internal pressure of the vacuum equipment is 0.1-1MPa, taking out after 6-12 hours of infiltration, and drying for 12-24 hours at the temperature of 100-150 ℃ to obtain a dried biscuit of the sand mold matrix;
(7) the dried sand mold matrix biscuit is cooled along with the furnace after being buried and sintered for 1 to 6 hours at the temperature of 1400 ℃ and 1600 ℃ to obtain SiC combined Al2O3And (4) sand quality mould.
2. 3D printed SiC bonded Al according to claim 12O3A process for producing a sand-like mold, characterized in that the alumina powder used in the step (1) has an average particle diameter of 40 μm and Al2O3The content is 99.9%; the polyamide resin powder has an average particle diameter of 10 μm and a content of 99%; the average grain diameter of the graphite powder is 40 mu m, and the content is 99.9 percent.
3. 3D printed SiC bonded Al according to claim 12O3The preparation method of the sand-quality mold is characterized in that the silica sol in the step (6) is industrial alkaline silica sol, the mass fraction of the silica is 20-50%, and the particle size is 7-10 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011527144.4A CN112620582A (en) | 2020-12-22 | 2020-12-22 | SiC combined Al for 3D printing2O3Method for preparing sand mould |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011527144.4A CN112620582A (en) | 2020-12-22 | 2020-12-22 | SiC combined Al for 3D printing2O3Method for preparing sand mould |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788081A (en) * | 2015-03-23 | 2015-07-22 | 济南大学 | Preparation method of aluminum oxide powder 3D printing material |
| CN106007723A (en) * | 2016-05-20 | 2016-10-12 | 中国科学院上海硅酸盐研究所 | Making method of SiC ceramic green body |
| CN109734425A (en) * | 2019-02-20 | 2019-05-10 | 华中科技大学 | A kind of selective laser quick molding method of complex phase ceramic casting mold and products thereof |
| CN110280717A (en) * | 2019-07-12 | 2019-09-27 | 维捷(苏州)三维打印有限公司 | A kind of ink-jet bonding 3 D-printing sand mold Ti alloy casting technique |
| CN111153706A (en) * | 2020-01-16 | 2020-05-15 | 三峡大学 | Graphite-based silicon carbide ceramic composite heat-insulating material and preparation method thereof |
-
2020
- 2020-12-22 CN CN202011527144.4A patent/CN112620582A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788081A (en) * | 2015-03-23 | 2015-07-22 | 济南大学 | Preparation method of aluminum oxide powder 3D printing material |
| CN106007723A (en) * | 2016-05-20 | 2016-10-12 | 中国科学院上海硅酸盐研究所 | Making method of SiC ceramic green body |
| CN109734425A (en) * | 2019-02-20 | 2019-05-10 | 华中科技大学 | A kind of selective laser quick molding method of complex phase ceramic casting mold and products thereof |
| CN110280717A (en) * | 2019-07-12 | 2019-09-27 | 维捷(苏州)三维打印有限公司 | A kind of ink-jet bonding 3 D-printing sand mold Ti alloy casting technique |
| CN111153706A (en) * | 2020-01-16 | 2020-05-15 | 三峡大学 | Graphite-based silicon carbide ceramic composite heat-insulating material and preparation method thereof |
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Application publication date: 20210409 |