A kind of preparation method of gradient ceramic core material

A technology of ceramic core and ceramic powder, which is applied in the direction of core, casting molding equipment, casting mold, etc., can solve the problems of reducing the qualified rate, shrinkage or deformation, and long core removal time, so as to reduce the cost of raw materials and prevent shrinkage. Or deformation, improve the effect of core removal efficiency

Active Publication Date: 2020-09-29
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ceramic cores for precision casting of turbine hollow blades of gas turbines and aero-engines are generally formed by hot press injection. These large-sized ceramic cores are prone to shrinkage or deformation in thick and large parts, which reduces the qualified rate.
[0004] In addition, the removal time of ceramic cores is generally about 24 hours, and for large-sized ceramic cores, the removal time even exceeds 48 hours, and the removal efficiency is low
[0005] At present, there is no reasonable method to solve the problems of shrinkage or deformation of the thick and large parts of the large-size ceramic core, long time for core removal, and high raw material costs under the premise of ensuring the strength of the ceramic core.

Method used

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  • A kind of preparation method of gradient ceramic core material
  • A kind of preparation method of gradient ceramic core material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a gradient ceramic core material, comprising the following steps:

[0029] (1) After drying 325 mesh, 150 mesh, and 70 mesh fused silica powder with a purity of 92.3% and 350 mesh alumina powder with a purity of 95.6% at 120°C for 90 minutes, the mass ratio is 40% :30%:20%:10% mix evenly.

[0030] (2) Heat the paraffin wax (No. 70) to 90°C to completely melt, add a small amount of oleic acid and mix evenly, slowly add the mixed powder prepared in step (1) to the wax liquid in batches, stir evenly and then vacuumize , to prepare 1# ceramic slurry. The mass ratio of paraffin wax, oleic acid and mixed powder is 19.6%: 0.4%: 80%.

[0031] (3) After drying the fused silica powder of 325 mesh, 150 mesh, and 70 mesh with a purity of 99.5% and 800 mesh alumina powder with a purity of 99.3% at 120°C for 90 minutes, the mass ratio is 45% : 25%: 20%: 10% mix evenly.

[0032] (4) After heating the paraffin wax (No. 58) to 80°C and completely melting, add...

Embodiment 2

[0038] A preparation method of a gradient ceramic core material, comprising the following steps:

[0039] (1) After drying the fused silica powder with a purity of 92.0% and 400 mesh alumina powder with a purity of 96.4% of 400 mesh, 200 mesh, and 100 mesh at 120°C for 90 minutes, the mass ratio is 35% : 30%: 20%: 15% mix evenly.

[0040] (2) After heating the paraffin (No. 64) to 85°C and completely melting, add a small amount of oleic acid, and then slowly add the mixed powder prepared in step (1) to the wax liquid in batches, paraffin, oleic acid and mixed powder The mass ratio of the material is 24.62%: 0.38%: 75%. After stirring evenly, vacuumize to prepare 1# ceramic slurry.

[0041] (3) After drying 400 mesh, 200 mesh, and 100 mesh fused silica powder with a purity of 98.9% and 1000 mesh alumina powder with a purity of 99.5% at 120°C for 90 minutes, the mass ratio is 40%: The ratio of 30%: 20%: 10% is evenly mixed.

[0042] (4) After heating the paraffin (No. 52) to ...

Embodiment 3

[0049] A preparation method of a gradient ceramic core material, comprising the following steps:

[0050] (1) After drying 325 mesh, 150 mesh, and 70 mesh fused silica powder with a purity of 92.3% and 350 mesh alumina powder with a purity of 95.6% at 120°C for 90 minutes, the mass ratio is 40% :30%:20%:10% mix evenly.

[0051] (2) Heat the paraffin wax (No. 70) to 90°C to completely melt, add a small amount of oleic acid and mix evenly, slowly add the mixed powder prepared in step (1) to the wax liquid in batches, stir evenly and then vacuumize , to prepare 1# ceramic slurry. The mass ratio of paraffin wax, oleic acid and mixed powder is 14.57%: 0.43%: 85%.

[0052] (3) After drying the fused silica powder of 325 mesh, 150 mesh, and 70 mesh with a purity of 99.5% and 800 mesh alumina powder with a purity of 99.3% at 120°C for 90 minutes, the mass ratio is 45% :25%:20%:10% mix evenly.

[0053] (4) After heating the paraffin wax (No. 58) to 80°C and completely melting, add ...

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Abstract

The invention belongs to the field of high-temperature alloy investment precision casting, in particular to a preparation method of a gradient ceramic core material. The method adopts a pouring method, uses relatively cheap raw materials to prepare a ceramic core "core bone" with high porosity, then puts the "core bone" into a ceramic core mold, and prepares a ceramic core by hot pressure injection. The method can effectively prevent the deformation and shrinkage of the thick part of the ceramic core, and can increase the local porosity of the ceramic core under the condition of ensuring the strength of the material, thereby greatly improving the core removal efficiency. At the same time, the "core bone" of the ceramic core can be prepared using relatively cheap raw materials, thus greatly reducing the production cost of the ceramic core.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy investment precision casting, and in particular relates to the preparation technology of ceramic core materials for gas turbine or aeroengine turbine hollow blades. Background technique [0002] The hollow blades of modern gas turbines and aero-engine turbines must be formed by investment casting, and ceramic cores are used to form the inner cavity of the blade. Since the inner cavity of the hollow blade cannot be processed, it can only be formed directly by the ceramic core, so the dimensional accuracy of the ceramic core is required to be very high. During the pouring process, the ceramic core needs to be soaked in a high-temperature alloy liquid above 1400°C. In order to ensure that the ceramic core does not deform, break, or chemically react with the alloy liquid, it is necessary to strictly control the low-melting-point impurities in the raw materials and those that are easy to mix with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/10C04B35/622B22C9/10
Inventor 曾洪伍林何建杨功显杨照宏巩秀芳赵代银张松泉
Owner DONGFANG TURBINE CO LTD
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