Light curing 3D printing preparing method for complex double-wall silicon-based ceramic core

A ceramic core and 3D printing technology, which is applied in the field of precision casting, can solve problems such as complex procedures and high costs, and achieve the effects of simplifying the process flow, reducing cost loss, and reducing process steps

Active Publication Date: 2020-05-05

INST OF METAL RESEARCH - CHINESE ACAD OF SCI

7 Cites 4 Cited by

AI-Extracted Technical Summary

Problems solved by technology

With the improvement of the thrust-to-weight ratio requirements of aero-engines, based on the basic principles of fluid dynamics and heat transfer mechanics, the design of the inner cavity of the engine blades is becoming more and more complex, which puts more stringent requirements on the performance of the core. The traditional process of preparing high-...

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Method used

(4) utilize Autodesk inventor to set up complex double-walled silicon-based ceramic core three-dimensional model, use Simplify3D to carry out slicing process to core three-dimensional model and adopt C++ to carry out 3D printing path G code programming as STL format, then will prepare The silicon-based ceramic core slurry with high solid content, high printing performance, high reaction efficiency, and more stable flow and settlement performance is put into the receiving port, and the running program ...

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Abstract

The invention relates to the field of precise casting and particularly relates to a light curing 3D printing preparing method for a complex double-wall silicon-based ceramic core for investment casting. The method comprises the steps that firstly, silicon-based ceramic core paste with high solid content, high printing performance and more stable and more excellent flow settling performance is prepared; secondly, a three-dimensional model of the complex double-wall silicon-based ceramic core is obtained according to a single crystal hollow double-wall engine blade needing to be obtained, and the core three-dimensional model is subjected to slicing treatment and light curing 3D printing path programming; thirdly, an STL file of the core is imported into a light curing 3D printer, printing iscarried out layer by layer in combination with the silicon-based ceramic core paste prepared in the first step, and a light cured double-wall core biscuit is obtained; and fourthly, the core biscuitis subjected to drying and sintering processes, and the light cured 3D printed complex double-wall silicon-based ceramic core is obtained. The complex double-wall silicon-based ceramic core is used for precise casting of the hollow engine blade and replaces a double-wall core which is complex in working procedure and needs to be manufactured through multiple dies in traditional investment casting.

Application Domain

Auxillary shaping apparatus

Technology Topic

Investment castingStl file +10

Image

Examples

Experimental program(1)

Example Embodiment

[0063] Example

[0064] In this embodiment, the preparation method of the single crystal double-wall hollow turbine blade based on the light curing technology is as follows:

[0065] (1) Weigh 100g (v=46mL, ρ=2g/cm 3 ); monomer: 1,6-hexanediol diacrylate 20g (18mL), hexahydrophthalic diglycidyl ester 10g (11mL); dispersant: dipentaerythritol hexaacrylate (DPHA) 4g (3.5mL) ), and mixed with 0.8g sodium polyacrylate, 0.2g ammonium polyacrylate, 0.2g oleic acid; photoinitiator: benzoin dimethyl ether 0.8g, 2,4,6-trimethylbenzoyl diphenyl phosphine oxide 0.12 g, diarylsulfonium salt is 0.12g, triarylsulfonium salt is 0.12g; light absorber: 2,4-dihydroxybenzophenone 0.21g, 2-(2ˊ-hydroxy-5ˊ-methylbenzene Base) benzotriazole 0.15g; mineralizer: alumina 8g, zirconia 6g, the particle size of alumina is 20nm-40nm, and the particle size of zirconia is 20-40nm.

[0066] (2) Mix the spherical silicon-based ceramic powder mixed with the micron-level and nano-level with the mineralizer, and pass the ball milling treatment, wherein the ball is 10mm, 100g is added, the ball milling parameter is the speed of 330r/min, and the ball mill is 5.5h;

[0067] (3) After the ball milled mixture is sieved, it is dried and placed in a 60°C drying oven for 11 hours to obtain a uniformly mixed powder after drying. Add the photoinitiator, light absorber and dispersant to the monomer and stir to dissolve it. At the same time, add the dried mixed powder. After adding it, stir it into a viscous state, then put it into the homomixer for thorough mixing and pumping. The setting parameters of the vacuum and homogeneous mixer were 1200r/min for 60s and 1800r/min for 40s to obtain a silicon-based ceramic core slurry with a solid content of 56.6 vol%.

[0068] (4) Use Autodesk Inventor to establish a complex double-wall silicon-based ceramic core three-dimensional model, use Simplify3D to slice the core three-dimensional model, and use C++ for 3D printing path G code programming into STL format, and then the prepared high solid The silicon-based ceramic core slurry with phase content, high printing performance, high reaction efficiency, and more stable flow and settlement performance is placed in the receiving port, and the operating program is imported into the STL format file to print the ceramic core using light-curing 3D equipment.

[0069] (5) Put the cleaned silicon-based ceramic green body in the desiccant polyethylene glycol for 7-10 hours, and conduct a sufficient chemical drying treatment. When the time is up, take out the core, rinse it in water and put it in the drying box. Let it dry thoroughly. The specific steps of the sintering process are: putting the dried silicon-based ceramic core into a high-temperature sintering furnace, raising it from room temperature to 600°C for 10 hours, and holding it for 1 to 2 hours; then raising it from 600°C to 1200°C for 10 hours 8 hours, heat preservation for 4 hours; then cool down to room temperature with the furnace, take out the sintered sample, sintered silicon-based ceramic core is subjected to wax mold treatment, and then make hollow blade casting mold shell, using DD5 single crystal material , 2.2Kg, upper zone temperature 1470°C, lower zone temperature 1520°C, pouring temperature 1520°C, standing time 5min, drawing rate 5mm/min process parameters for single crystal casting, such as Figure 4 Shown.

[0070] The results of the examples show that the method of the present invention has simple process, integrated forming, short cycle, low cost, and high efficiency. Based on the actual use environment of silicon-based ceramic cores, a processing process flow of light-curing integrated forming complex double-wall cores is constructed. It provides the possibility to realize the integrated industrial production of silicon-based ceramic cores with complex structures, and establish corresponding evaluation methods to meet the requirements of precision casting.

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PUM

Property	Measurement	Unit
Granularity	20.0 ~ 40.0	nm
Granularity	100.0 ~ 300.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Convenience and efficiency
Reduce process steps

Light curing 3D printing preparing method for complex double-wall silicon-based ceramic core

A ceramic core and 3D printing technology, which is applied in the field of precision casting, can solve problems such as complex procedures and high costs, and achieve the effects of simplifying the process flow, reducing cost loss, and reducing process steps

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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