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Method for preparing porous alumina ceramic core

A technology of porous alumina and ceramic cores, which is applied in the field of aero-engines, can solve problems such as the difficulty of removing alumina ceramic cores, and achieve the effect of structural stability

Active Publication Date: 2012-01-18
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above problems in the manufacturing technology of alumina ceramic cores for aero-engine turbine blades, the present invention provides a method for preparing porous alumina ceramic cores to solve the problem of difficult removal of alumina ceramic cores

Method used

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  • Method for preparing porous alumina ceramic core

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Experimental program
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Effect test

Embodiment 1

[0027] Fused corundum powder and porous α-Al as raw materials for preparing porous alumina ceramic cores 2 o 3 powders, mineralizers and plasticizers.

[0028] Porous α-Al 2 o 3 The powder was prepared as follows.

[0029] γ-Al with a particle size of 30 μm 2 o 3 Powder is used as raw material, and the γ-Al 2 o 3 The powder is calcined at a high temperature at 1450° C. for 4 hours. Cool down to room temperature with the furnace, and ball mill the calcined product to a particle size of 12 μm to obtain porous α-Al 2 o 3 pink.

[0030] Mineralizer using TiO 2 Powder, plasticizer adopts paraffin. The particle size requirements of raw materials are: fused corundum powder 50μm, porous α-Al 2 o 3 Powder 12μm, TiO 2 Powder 5 μm.

[0031] The preparation method of the porous alumina ceramic core is as follows.

[0032] (1) Ingredients

[0033] In terms of mass percentage, the ratio of raw materials is: fused corundum powder 49%, porous α-Al 2 o 3 Powder 49.5%, TiO ...

Embodiment 2

[0045] Fused corundum powder and porous α-Al as raw materials for preparing porous alumina ceramic cores 2 o 3 powders, mineralizers and plasticizers.

[0046] Porous α-Al 2 o 3 The powder was prepared as follows.

[0047] γ-Al with a particle size of 50 μm 2 o 3 Powder is used as raw material, and the γ-Al 2 o 3The powder is calcined at a high temperature at 1500° C. for 3 hours. Cool down to room temperature with the furnace, and ball mill the calcined product to a particle size of 25 μm to obtain porous α-Al 2 o 3 pink.

[0048] Mineralizer using TiO 2 Powder, plasticizer adopts paraffin. The particle size requirements of raw materials are: fused corundum powder 80μm, porous α-Al 2 o 3 Powder 25μm, TiO 2 Powder 10 μm.

[0049] The preparation method of the porous alumina ceramic core is as follows.

[0050] (1) Ingredients

[0051] In terms of mass percentage, the ratio of raw materials is: fused corundum powder 55%, porous α-Al 2 o 3 Powder 43%, TiO 2 ...

Embodiment 3

[0063] Fused corundum powder and porous α-Al as raw materials for preparing porous alumina ceramic cores 2 o 3 powders, mineralizers and plasticizers.

[0064] Porous α-Al 2 o 3 The powder was prepared as follows.

[0065] γ-Al with a particle size of 10 μm 2 o 3 Powder is used as raw material, and the γ-Al 2 o 3 The powder is calcined at a high temperature at 1400° C. for 5 hours. Cool down to room temperature with the furnace, and ball mill the calcined product to a particle size of 1 μm to obtain porous α-Al 2 o 3 pink.

[0066] Mineralizer using TiO 2 Powder, plasticizer adopts paraffin. The particle size requirements of raw materials are: fused corundum powder 20μm, porous α-Al 2 o 3 Powder 1μm, TiO 2 Powder 1 μm.

[0067] The preparation method of the porous alumina ceramic core is as follows.

[0068] (1) Ingredients

[0069] In terms of mass percentage, the ratio of raw materials is: fused corundum powder 44%, porous α-Al 2 o 3 Powder 55%, TiO 2 Po...

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Abstract

The invention provides a method for preparing a porous alumina ceramic core. The ceramic core comprises the following raw materials: electric melting-corundum powder, porous alpha-Al2O3 powder, TiO2 powder and paraffin. The method comprises the following steps: mixing the electric melting-corundum powder, the porous alpha-Al2O3 powder and the TiO2 powder; heating an oil bath crucible type stirrerto 100 to 120 DEG C; adding the paraffin into the oil-bath crucible type stirrer to be melted; adding mixed powder to the paraffin, and stirring the mixture to obtain mixed slurry; pressing a core byadopting a hydraulic core-pressing machine, controlling the temperature of the mixed slurry to between 95 and 110 DEG C and the injection pressure to between 3.0 and 3.5MPa; and roasting the pressed core by adopting a bell type sintering furnace. The porous alumina ceramic core prepared by the method has the porosity of between 45 and 55 percent, and can effectively improve the core removing performance of the core.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and relates to the precision casting technology of turbine hollow single crystals or directional blades, in particular to a preparation method of ceramic cores. Background technique [0002] Alumina ceramic core manufacturing technology for aeroengine turbine blades is one of the key technologies for manufacturing complex inner cavity turbine blades. Since the alumina ceramic core has the incomparable thermal strength and thermal stability of the silicon-based core, and the fused corundum has no crystal transformation during the core firing and use process, the structure is stable, and the corundum shell has a matching Linear expansion coefficient, very suitable for casting single crystal and eutectic blades. However, the difficulty of removing the core of the alumina ceramic core has always plagued its application. In order to solve the problem of difficult core removal of alumina ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/622C04B35/10
Inventor 张世东孙革史凤岭张明俊李琳
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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