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A method for vacuum degreasing of gel injection molded turbine blade ceramic mold

A technology of ceramic casting and gel injection moulding, applied in the field of rapid casting, can solve the problems of large gas generation, shell cracking, impact damage of blanks, etc. The effect of thermal stress

Active Publication Date: 2015-12-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heating process is not properly controlled, it is very easy to cause too much instantaneous gas generation, which will cause impact damage to the green body; due to the large difference in thermal expansion coefficient between the resin mold and the ceramic body, thermal stress will cause the shell cracking of the low-strength ceramic body , core fracture, core offset and other defects
The strength of the ceramic green body in the medium temperature range can be improved by adding fibers, but it has a great influence on the fluidity of the ceramic slurry, and it is difficult to ensure the filling quality of the fine structure

Method used

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  • A method for vacuum degreasing of gel injection molded turbine blade ceramic mold
  • A method for vacuum degreasing of gel injection molded turbine blade ceramic mold
  • A method for vacuum degreasing of gel injection molded turbine blade ceramic mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Use 3D modeling software (UG, ProE, etc.) to design the blade resin mold, import the CAD model data into the Magics layering software for layering processing, and carry out the hollowing out process inside the entity, and import the model layering data into the light-curing rapid prototyping equipment Make a hollow turbine blade resin mold, and the molding resin is SPRS8981 photosensitive resin.

[0035] (2) Prepare ceramic slurry based on gel injection molding process.

[0036] 2) Weigh 60% large particle size aluminum oxide alumina, 39% aluminum oxide, and 1% magnesium oxide according to the mass ratio, and stir and mix them evenly in a container to obtain powder; wherein, the particle size of large particle size alumina The particle size of small-particle-diameter alumina is 2-10 μm.

[0037] 2) Dissolve the organic monomer acrylamide AM and the crosslinking agent N,N'-methylenebisacrylamide MBAM in deionized water at a mass ratio of 20:1, then add a dispersant ...

Embodiment 2

[0052] (1) Use three-dimensional modeling software, such as UG, ProE, to design the blade resin mold, import the CAD model data into the Magics layering software for layering processing, and carry out the internal hollowing out of the blade resin mold after layering processing, and layer the model The data is imported into the photocuring rapid prototyping equipment to make the hollow turbine blade resin mold, and the molding resin is SPRS8981 photosensitive resin.

[0053] (2) Prepare ceramic slurry based on gel injection molding process:

[0054] 2) Weigh 65% large particle size aluminum oxide alumina, 30% aluminum oxide, and 5% magnesium oxide according to the mass ratio, and stir and mix them evenly in a container to obtain powder; wherein, the particle size of large particle size alumina The particle size of small-particle-diameter alumina is 2-10 μm.

[0055] 2) Dissolve the organic monomer methacrylamide and the crosslinking agent methyl acryl acrylate into deionized w...

Embodiment 3

[0065] (1) Use three-dimensional modeling software, such as UG, ProE, to design the blade resin mold, import the CAD model data into the Magics layering software for layering processing, and carry out the internal hollowing out of the blade resin mold after layering processing, and layer the model The data is imported into the photocuring rapid prototyping equipment to make the hollow turbine blade resin mold, and the molding resin is SPRS8981 photosensitive resin.

[0066] (2) Prepare ceramic slurry based on gel injection molding process:

[0067] 2) Weigh 70% large particle size aluminum oxide alumina, 26% aluminum oxide, and 4% magnesium oxide by mass percentage, and stir and mix them evenly in a container to obtain powder; wherein, the particle size of large particle size alumina The particle size of small-particle-diameter alumina is 2-10 μm.

[0068] 2) Dissolve the organic monomer methylolacrylamide and the crosslinking agent N,N'-methylenebisacrylamide MBAM in deioniz...

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Abstract

The invention discloses an integrated ceramic mold vacuum degreasing method for gel-casting turbine blades. The method comprises the following steps: molding a resin mold of a hollow turbine blade ceramic mold based on a photocuring technology, molding an integral ceramic mold biscuit by adopting a gel casting technology, and finally, performing freeze drying, vacuum degreasing, impregnation after-treatment and final sintering. By adoption of a synergistic effect of the vacuum degreasing process and an inner hollow structure of the resin mold, the ceramic mold biscuit can keep a certain strength in the whole degreasing process, and the possibility of damaging the blank due to the gas forming amount and thermal stress is effectively reduced. The method can be used for degreasing the integrated ceramic mold biscuit for the gel casting turbine blades, and the quality and completeness of the degreased ceramic casting mold can be improved.

Description

technical field [0001] The invention belongs to the field of rapid casting, in particular to a method for vacuum degreasing of a gel-injection-molded turbine blade ceramic mold. Background technique [0002] Turbine blades are one of the key components of aero-engines and gas turbines. Due to their high working temperature, harsh working environment and complicated stress state, it is difficult to design and manufacture them. The traditional manufacturing method of hollow turbine blades is investment casting, and the introduction of heterogeneous air film holes and complex cooling technology poses challenges to traditional turbine blade manufacturing technologies. Specifically, the shortcomings of the investment casting process are reflected in the installation errors in the combination process of the core and the wax mold, the eccentric core perforation defects in the casting process, and the complicated and lengthy process. [0003] The hollow turbine blade integrated cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/638
Inventor 李涤尘鲁中良荆慧
Owner XI AN JIAOTONG UNIV
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