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High-performance ceramic mold shell for directional solidification, and production technology thereof

A ceramic formwork and directional solidification technology, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of difficult guarantee of formwork strength, dimensional accuracy and metallurgical quality of directional solidification castings, and achieve high strength, Low thermal stability, the effect of improving the product qualification rate

Active Publication Date: 2015-07-15
江苏永瀚特种合金技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The EC95 and 811 series of ceramic formworks for directional solidification developed in China are all fused corundum-silica sol system formworks, and their strength is mainly established by the secondary mullite generated in the formwork, and the formation temperature of the secondary mullite is Above 1400°C, if the secondary mullite of the mold shell is insufficient, the strength of the mold shell will be difficult to guarantee, which will affect the dimensional accuracy and metallurgical quality of the directional solidification casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 The ceramic mold shell for high-performance directional solidification is composed of a surface layer, a transition layer, a reinforcement layer and a sealant layer. The reinforcement layer is composed of a first reinforcement layer and a second reinforcement layer. The refractory material of the first reinforcement layer Zircon powder and fused corundum sand, the refractory material of the second reinforcement layer is fused corundum powder and fused corundum sand, the total number of layers of the first reinforcement layer and the second reinforcement layer is 4 layers, that is, the ceramic formwork along the The surface layer to the sealant layer are the surface layer, the transition layer, the first reinforcement layer, the second reinforcement layer, the first reinforcement layer, the second reinforcement layer, and the sealer layer in which the refractory material is zircon powder.

[0032] In Example 1, the particle diameters of the zircon powder in the ...

Embodiment 2

[0052] The difference between Example 2 and Example 1 is that the total number of layers of the first reinforcement layer and the second reinforcement layer is 5 layers, that is, the ceramic formwork is followed by the surface layer, the transition layer, and the first reinforcement layer along the surface layer to the sealing layer. layer, the second reinforcement layer, the first reinforcement layer, the second reinforcement layer, the first reinforcement layer, and the sealant layer in which the refractory material is fused corundum powder.

[0053] In Example 2, the particle diameters of the zircon powder in the first reinforcement layer and the fused corundum powder in the second reinforcement layer are both 325 mesh, and the particle diameters of the fused corundum sand in the first reinforcement layer and the second reinforcement layer are 21-28m;

[0054] In Example 2, the refractory material of the sealing layer is fused corundum powder, and the particle size of the r...

Embodiment 3

[0060] The difference between Example 3 and Example 1 is that the total number of layers of the first reinforcement layer and the second reinforcement layer is 6 layers, that is, the ceramic formwork is followed by the surface layer, the transition layer, and the first reinforcement layer along the surface layer to the sealing layer. layer, the second reinforcement layer, the first reinforcement layer, the second reinforcement layer, the first reinforcement layer, the second reinforcement layer, and the sealant layer in which the refractory material is zircon powder.

[0061] In Example 3, the particle diameters of the zircon powder in the first reinforcement layer and the fused corundum powder in the second reinforcement layer are both 350 mesh, and the particle diameters of the fused corundum sand in the first reinforcement layer and the second reinforcement layer are It is 14-21m.

[0062] In embodiment 3, the refractory material of the sealing layer is zircon powder, and t...

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PUM

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Abstract

The invention discloses a high-performance ceramic mold shell for directional solidification. The ceramic mold shell is formed by laminating a surface layer, a transition layer, a reinforced layer and a slurry sealing layer, the reinforced layer is formed by alternatively laminating first reinforced layers and second reinforced layers from the surface layer to the slurry sealing layer, the refractory material of the first reinforced layers comprises zircon powder and fused pulverized corundum, and the refractory material of the second reinforced layers comprises fused alundum powder and fused pulverized corundum. The invention also discloses a production technology of the high-performance ceramic mold shell for directional solidification. The ceramic mold shell produced through the technology has the advantages of good dimension stability, moderate residual strength, safety and use convenience.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a ceramic mold shell for high-performance directional solidification and a preparation process thereof. Background technique [0002] Turbine blades are one of the most critical parts of aero-engines, and the working performance of turbine blades directly affects the thrust-to-weight ratio of aero-engines. At present, the working limit temperature of the second-generation single crystal alloy is below 1100°C. If it is to serve in the harsh environment where the turbine inlet temperature of the aeroengine is as high as 1600°C, it is necessary to adopt a complex airflow internal cooling channel in the blade design. Cooling to effectively reduce the actual temperature of the blade material. The application of the hollow blade also greatly reduces the weight of the blade. However, the complex cavity structure and thin wall of castings undoubtedly increase the difficulty of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor 刘张涛刘敏贺剑姜跃英张大春
Owner 江苏永瀚特种合金技术股份有限公司
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