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A kind of rapid prototyping method and product of laser selected area of ​​multi-phase ceramic mold

A technology of composite phase ceramics and laser selection, which is applied in the field of ceramic preparation, can solve the problems of large sintering shrinkage, difficulty in control, and small volume density of formed samples, and achieve good flow properties, shrinkage compensation, and good SLS molding performance.

Active Publication Date: 2020-10-02
HUAZHONG UNIV OF SCI & TECH +1
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AI Technical Summary

Problems solved by technology

As one of the 3D printing (additive manufacturing) technologies, SLS technology is suitable for rapid manufacturing of parts with complex structures and special shapes, and can meet the rapid prototyping manufacturing requirements of various ceramic parts such as integral and split parts; and SLS technology There is no need to set up a support structure during the molding process, which simplifies the post-processing process of the molded parts, which is expected to solve the problems of long production cycle, high mold cost, and inability to meet the new requirements of traditional investment precision casting in the manufacture of complex-shaped ceramic cores and shells. Outstanding Issues in Product Development Rapid Response Demand
[0004] In recent years, there have been relevant reports on the rapid prototyping of ceramic materials using selective laser sintering technology. For example, CN200510020015.5 discloses a preparation method of laser sintering rapid prototyping silicon carbide ceramics, which adopts laser sintering technology to form silicon carbide powder. Then metal silicon is infiltrated and treated with lye to obtain complex-shaped silicon carbide ceramics. However, the silicon carbide powder used in this method needs to be sprayed and granulated to ensure good fluidity. The preparation process of raw materials is cumbersome. The immersion metal silicon process is difficult to control, and defects such as pores are likely to remain; in addition, CN201010222794.8 discloses a rapid prototyping manufacturing method for ceramic cores, which first adopts the SLS method to form a mixed powder of low-temperature strengthening agent and ceramic powder, and then brushes Or soak high-temperature binder (silica sol, alumina sol or phosphoric acid solution, etc.) and carry out pre-firing and high-temperature sintering respectively to obtain ceramic core products, but the ceramic sample volume density obtained by this method is small, and the strength is low
Therefore, the current selective laser sintering technology in the rapid prototyping of ceramic materials still has problems such as low volume density of the formed sample, large sintering shrinkage rate (poor dimensional accuracy), and low strength. Further applications in the investment casting industry

Method used

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  • A kind of rapid prototyping method and product of laser selected area of ​​multi-phase ceramic mold
  • A kind of rapid prototyping method and product of laser selected area of ​​multi-phase ceramic mold
  • A kind of rapid prototyping method and product of laser selected area of ​​multi-phase ceramic mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (a) Prepare mixed Al according to the blending ratio calculated by the model 2 O 3 Powder, where D 50 5um Al 2 O 3 Powder accounts for 10wt%, D 50 20um Al 2 O 3 Powder accounts for 19wt%, D 50 90um Al 2 O 3 The powder accounts for 71wt%, and then the epoxy resin E12 is mixed with Al 2 O 3 The powder is blended at a mass ratio of 1:20 and placed in a three-dimensional mixer, and ZrO is added at a ratio of ball to material ratio of 1:1 2 Grind the ball and mix for 2h to prepare the Al 2 O 3 -E12 composite powder;

[0043] (b) Use the above Al 2 O 3 -E12 composite powder for selective laser sintering rapid prototyping. The laser used in the process is a continuous laser with a wavelength of 9.4μm. The laser spot diameter is 0.15mm, and its power is 6W. 2 O 3 -E12 composite powder spreading thickness is 0.2mm, preheating temperature is 40℃, scanning rate is 1300mm / s, the laser power at the contour position of the model is 0.5 times that of the inside of the model, and the scannin...

Embodiment 2

[0047] (a) Prepare mixed Al according to the blending ratio calculated by the model 2 O 3 Powder, where D 50 5um Al 2 O 3 Powder accounts for 17wt%, D 50 20um Al 2 O 3 Powder accounts for 19wt%, D 50 90um Al 2 O 3 The powder accounts for 64wt%, and then the epoxy resin E12 is mixed with Al 2 O 3 The powder is blended at a mass ratio of 3:50 and placed in a three-dimensional mixer, and ZrO is added at a ratio of ball to material ratio of 1:1 2 Grind the ball and mix for 3h to prepare the Al 2 O 3 -E12 composite powder;

[0048] (b) Use the above Al 2 O 3 -E12 composite powder for selective laser sintering rapid prototyping. The laser used in the process is a continuous laser with a wavelength of 10.2μm. The laser spot diameter is 0.18mm, and its power is 8W. 2 O 3 -E12 composite powder spreading thickness is 0.17mm, preheating temperature is 45℃, scanning rate is 1500mm / s, where the laser power at the contour position of the model is 0.5 times that inside the model, and the scanning ...

Embodiment 3

[0052] (a) Prepare mixed Al according to the blending ratio calculated by the model 2 O 3 Powder, where D 50 5um Al 2 O 3 Powder accounted for 14wt%, D 50 20um Al 2 O 3 Powder accounts for 20wt%, D 50 90um Al 2 O 3 The powder accounts for 66wt%, and then the epoxy resin E12 is mixed with Al 2 O 3 The powder is blended at a mass ratio of 1:20 and placed in a double cone mixer, and ZrO is added at a ratio of ball to material ratio of 1:1 2 Grind the ball and mix for 2h to prepare the Al 2 O 3 -E12 composite powder;

[0053] (b) Use the above Al 2 O 3 -E12 composite powder for selective laser sintering rapid prototyping. The laser used in this process is a continuous laser with a wavelength of 9.6μm. The laser spot diameter is 0.17mm, and its power is 9W. 2 O 3 -E12 composite powder spreading thickness is 0.2mm, preheating temperature is 40℃, scanning rate is 1700mm / s, the laser power at the contour position of the model is 0.5 times that of the model, and the scanning rate at the cont...

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Abstract

The invention belongs to the field of ceramic preparation, and discloses a laser zone-selection rapid forming method of a complex-phase ceramic casting mold and a product thereof. The method comprisesthe following steps: fully mixing Al2O3 powder with different particle sizes with epoxy resin E12 to obtain Al2O3-E12 composite powder; carrying out selective laser sintering (SLS) rapid forming by using the powder to obtain an Al2O3-E12 casting green body, and carrying out silica sol infiltration treatment under vacuum after surface dust is removed; degreasing and presintering to obtain an Al2O3-SiO2 ceramic cast green body; and performing silica sol infiltration treatment on the Al2O3-SiO2 composite ceramic casting mold under vacuum again, and finally sintering at high temperature to obtainthe complex-phase ceramic casting mold. According to the invention, only simple mechanical mixing is needed to ensure that the powder of the raw materials has good flowability and SLS forming performance, and by introducing a secondary silica sol vacuum infiltration process, the compactness of the obtained ceramic mold is improved while the dimensional accuracy is ensured.

Description

Technical field [0001] The invention belongs to the field of ceramic preparation, and more specifically, relates to a laser selective rapid prototyping method of a multiphase ceramic mold and a product thereof. Background technique [0002] Investment casting is a production technology that can produce light-weight, thin-walled and complex-shaped castings that are hardly restricted by the size, shape and quality of parts. Therefore, it is one of the main technologies for preparing high-temperature precision alloy castings, especially suitable for Production of aero-engine turbine blades, turbine discs, guide belts and combustion chambers. The current investment precision casting process has the problems of complex ceramic mold (shell, core) preparation process, lengthy and low forming rate. At the same time, because the core and shell of traditional investment casting are formed separately, errors are prone to occur when combined. , Which greatly limits the production efficiency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 李晨辉邹阳刘江安史玉升吴甲民贺智勇张启富
Owner HUAZHONG UNIV OF SCI & TECH
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