Energy absorbing ceramic powder composition for digital light processing technology and preparation method thereof

Abstract

The invention relates to an energy-absorbing ceramic powder composition and a preparation method thereof, in particular to an energy-absorbing ceramic powder composition for a digital light processing technology and a preparation method of the energy-absorbing ceramic powder composition. Powder formed by the ceramic composition has an excellent energy absorption characteristic, and the prepared ceramic slurry can effectively realize an impact resistance characteristic.

Description

Technical Field

[0001] The present invention relates to an energy absorbing ceramic powder composition and a preparation method thereof, and more particularly to an energy absorbing ceramic powder composition for digital light processing technology and a preparation method thereof. Background Art

[0002] Digital light processing technology has made rapid progress in the molding and manufacturing of complex resin composite parts. Compared with traditional polymer product molding methods, resin additive manufacturing technology has the advantages of high molding accuracy, no molds and low manufacturing costs. Polymer composites, such as resin composites, can be used as metal substitutes in applications such as ships, aircraft and the electronics industry due to their unique mechanical and energy absorption properties, enabling hollow, thin-walled and other complex structural parts. However, most pure resin systems have defects such as low fracture toughness and heat deformation temperature, poor crack resistance and expansion, which can lead to a shortened service life. Therefore, improving the mechanical properties of resins has become a research hotspot in application environments such as coatings, structural materials and equipment with high temperature, high pressure and high speed. In order to further reduce costs and improve energy absorption performance, it is still necessary to conduct more in-depth research on resin composites to ensure their safety, economic benefits and environmental benefits.

[0003] In order to solve the above problems, the mechanical properties of resin can be improved by filling rubber, glass fiber, thermoplastic resin and inorganic particles, but the research mainly focuses on wear resistance (Journal of Tribology, 2017, 37(05): 574-580). CN 110358256 A discloses a method for preparing a graphene / silicon carbide composite reinforced resin material, which has good wear resistance and corrosion resistance. In order to ensure that the equipment can serve in an impact-resistant environment, it is necessary to enhance the energy absorption characteristics of the resin reinforced material in addition to wear resistance, which will also promote its further application. Summary of the invention

[0004] The purpose of the present invention is to provide an energy absorbing ceramic powder composition for digital light processing technology to solve the above-mentioned problems existing in the prior art. The powder formed by the ceramic composition of the present invention should have excellent energy absorption properties, and the prepared ceramic slurry can effectively achieve impact resistance.

[0005] Another object of the present invention is to provide a method for preparing the above composition.

[0006] According to a first aspect of the present invention, the present invention provides an energy absorbing ceramic slurry composition, which is composed of the following components by mass percentage:

[0007]

[0008] In the above-mentioned energy absorbing ceramic slurry composition, silicon carbide is a ceramic powder and is the main material for enhancing energy absorption; carbon fiber and diamond can enhance the viscosity of the ceramic powder in the resin; oxidized polyethylene wax can improve the dispersion rate of the ceramic powder in the resin; the combination of these components and the above-mentioned percentage range of each component are determined through a large number of experiments, and the above-mentioned combination and percentage range make the slurry formed by the ceramic composition of the present invention have the above-mentioned density advantage.

[0009] The ceramic powder formed by the energy absorbing ceramic slurry composition of the present invention can be mixed with commercially available photosensitive resin (such as longitudinal cubic ANYCUBIC photosensitive resin), and the weight content of the energy absorbing ceramic slurry composition is 5% to 15%.

[0010] The oxidized polyethylene wax used in the slurry composition of the present invention refers to a wax having lubricity, and preferably WE-2 having an average molecular weight of 2000-300.

[0011] According to a second aspect of the present invention, the present invention provides a method for preparing an energy absorbing ceramic slurry composition, comprising the following steps:

[0012] (a) adding silicon carbide to a photosensitive resin according to the above mass percentage to form a slurry;

[0013] (b) adding carbon fiber and diamond to the slurry according to the above mass percentages;

[0014] (c) stirring the solution for half an hour;

[0015] (d) adding oxidized polyethylene wax to the slurry according to the above weight percentage;

[0016] (e) Stir for half an hour.

[0017] The above steps are all carried out at normal temperature and pressure.

[0018] The ceramic composition of the present invention can be formed by conventional digital light processing (the sliced ​​model is projected layer by layer onto the slurry composition by a projector formed by digital light processing. After each layer of the projected image is solidified into a thin layer in an area where the resin layer is very thin, the forming table moves one layer and continues to solidify the next layer. This cycle is repeated until the overall printing is completed). This slurry has excellent density after sintering.

[0019] According to a third aspect of the present invention, the present invention provides a use of an energy absorbing ceramic slurry composition for preparing slurry for digital light processing forming technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1Hopkinson impact diagram for an embodiment.

[0021] Figure 2 is the stress-strain diagram of the embodiment. DETAILED DESCRIPTION

[0022] In the following embodiments, the initial peak pressure (N) is used to represent the compressive resistance of the material, and the higher this value is, the better the compressive resistance is; the platform stress (MPa) is used to represent the unit compressive strength of the material, and the higher this value is, the better the compressive resistance is; the absorbed energy (J) is used to represent the energy absorption intensity of the material, and the higher this value is, the more energy is absorbed; the specific energy absorption (J / g) is used to represent the unit energy absorption intensity of the material, and the higher this value is, the higher the energy absorption is.

[0023] In the impact test, a 10 2 / s to 10 4 / s strain rate variation range. The Hopkinson bar experimental technique is the main experimental means to obtain the stress-strain relationship of the material within this strain rate range. It can effectively test the behavior of the material under high strain rates and fill the vacant strain rate range between quasi-static loading and ultra-high-speed impact loading. In order to study the energy absorption characteristics of the formed structure under dynamic impact, a dynamic impact test was carried out on the formed structure using the Hopkinson bar experimental device. The loading conditions were to achieve an average strain rate of 800 -1 . The Hopkinson bar test equipment uses a high-strength alloy rod with a diameter of 16mm, which can test the dynamic mechanical properties of materials with a strength lower than 2GPa. The steps of preparing ceramics with high energy absorption using digital light processing technology: the slurry obtained in Examples (1, 2 and their comparative examples) is 3D printed using a photocuring molding printing device (ADT-3D-ZP-Printer-Pro-67-35). The sliced ​​model is projected layer by layer onto the slurry composition by a projector formed by digital light processing. After each layer of the projected image is cured into a thin layer in an area where the resin layer is very thin, the molding table moves one layer and continues to cure the next layer. This cycle is repeated until the overall printing is completed. After the printing process is completed, the sample is immersed in an ultrasonic cleaner filled with anhydrous ethanol for 2 minutes. After molding and cleaning, the energy absorption characteristics of the ceramic composite material are tested.

[0024] Example 1

[0025] At room temperature and pressure, silicon carbide is added to a commercial photosensitive resin (longitudinal cubic ANYCUBIC photosensitive resin) according to the components specified in the following Table 1 to form a slurry, carbon fiber and diamond are added to the above slurry, and then the solution is stirred for half an hour and oxidized polyethylene wax is added and stirred for half an hour, wherein the content of the ceramic powder composition (i.e., the sum of silicon carbide, carbon fiber, diamond and oxidized polyethylene wax) in the final slurry is 5wt.%-10wt.%, and the test results are listed in Table 1.

[0026] Example 2

[0027] The method of Example 1 was repeated according to the contents of the components specified in Table 1 below, except that 100 micron carbon fibers were used instead of 50 micron carbon fibers. The rest was the same as Example 1. The test results are listed in Table 1.

[0028] Comparative Example 1 (without adding carbon fiber)

[0029] At room temperature and pressure, silicon carbide is added to a commercial resin (ANYCUBIC photosensitive resin) according to the components specified in the following Table 1 to form a slurry, and diamond and oxidized polyethylene wax are added and stirred for half an hour. The content of the ceramic powder composition in the final slurry is 5wt.%-10wt.%. The test results are listed in Table 1.

[0030] Table 1

[0031]

[0032]

[0033] Finally, ceramics with high energy absorption were prepared using digital light processing technology. The maximum stress of the formed three-period minimum surface structure is up to 18.09MPa. And the maximum specific energy absorption can reach 71.63J / g. Therefore, this study realizes the printing of energy-absorbing ceramics through commercial digital light processing forming technology.

[0034] Figure 1 The results show that in the dynamic impact experiment, the unit cells at the left impact end and the right support end of the lattice structure uniform structure have undergone significant axial deformation and damage. Due to the compression of the crystal unit layers at both ends, the crystal units in the middle area are synchronously destroyed, resulting in X-shaped fracture deformation on both sides of the structure. Transient impact under dynamic strain rate will not cause obvious irregular damage to the structure or asymmetric shear damage. The axial deformation of the crystal units at the impact end and the support end of the structure, as well as the lateral damage of the lattice units in the middle area, together constitute the overall uniform fragmentation of the lattice structure under dynamic impact. As the strain rate increases, the strain of the structure will also increase.

[0035] Figure 2The results show that (each group of experiments was done twice in parallel) that the lattice structure exhibits a relatively uniform deformation pattern throughout the compression process. The obvious cross-band deformation and lateral compression in the middle caused by extrusion make the stress-strain curve of the lattice structure relatively flat in the plastic platform stage. Among them, the yield strength of the structure of Example 1 is the highest, which can reach an average of about 18MPa. The average yield strength of Example 2 is 8.25MPa, while the yield strength of Comparative Example 1 is 4.29MPa. The compressive strength of the traditional resin-based lattice structure is 2.2MPa, and the SEA value is 3.71J / g. Therefore, SiC reinforced resin can significantly improve the yield strength and energy absorption characteristics.

[0036] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. An energy absorbing ceramic slurry composition, which is composed of the following components by mass percentage:

2. The energy absorbing ceramic slurry composition according to claim 1, wherein the composition is composed of the following components by mass percentage:

3. The energy absorbing ceramic slurry composition according to claim 1, wherein the composition is composed of the following components by mass percentage:

4. The energy absorbing ceramic slurry composition according to any one of claims 1 to 3 and a photosensitive resin form a composition to form an energy absorbing ceramic powder for digital light processing technology, wherein the content of the energy absorbing ceramic slurry composition in the energy absorbing ceramic powder for digital light processing technology is 5wt.%-10wt.%.

5. A method for preparing the energy absorbing ceramic slurry composition according to any one of claims 1 to 3, comprising the following steps: (a) adding silicon carbide to a photosensitive resin to form a slurry; (b) adding carbon fiber and diamond to the slurry; (c) stirring the solution for half an hour; (d) adding oxidized polyethylene wax; (e) Stirring.

6. Use of the energy absorbing ceramic slurry composition according to claim 1 for preparing slurry for digital light processing forming technology.

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