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Method of improving liquidity of aluminum oxide mould core slurry

An alumina and fluidity technology, applied in the field of alumina ceramic core manufacturing, can solve the problems of poor fluidity of alumina core slurry, and achieve the effects of reducing sintering shrinkage, lowering mold temperature, and preventing deformation.

Inactive Publication Date: 2015-03-25
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the fluidity of alumina core slurry for the problem of poor fluidity of alumina core slurry in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of alumina core slurry

[0020] 40-50wt% F220 fused corundum powder, 47-57wt% F600 fused corundum powder, 2wt% spherical Al with a diameter of 1±0.5μm 2 o 3 and 1wt% TiO 2 Add it into the ball mill tank, and mix the ball for 2 to 2.5 hours to get the core material powder;

[0021] Add a plasticizer with a weight of 15-20% of the weight of the core powder into the agitator, the plasticizer is composed of 93wt% paraffin, 5% beeswax and 2wt% high-pressure polyethylene, and the agitator is heated to 115±5°C , after the plasticizer is melted, add core powder and stir for 22 hours;

[0022] (2) Core pressing

[0023] The core is pressed on the core injection machine, the mold temperature is controlled at 30-35°C, the slurry material temperature is controlled at 95-105°C, and the holding time is 50s.

[0024] After testing, the fluidity of the alumina core slurry prepared by the method is 190°-210°; after the core is fired, its sintering shrinkage is 0.4%-...

Embodiment 2

[0035] (1) Preparation of alumina core slurry

[0036] 40-50wt% F220 fused corundum powder, 48-58wt% F600 fused corundum powder, 1wt% spherical Al with a diameter of 1±0.5μm 2 o 3 and 1wt% TiO 2 Add it into the ball mill tank, and mix the ball for 2.0-2.5 hours to get the core powder;

[0037] Add a plasticizer with a weight of 15-20% of the weight of the core powder into the agitator, the plasticizer is composed of 93wt% paraffin, 5% beeswax and 2wt% high-pressure polyethylene, and the agitator is heated to 115±5°C , after the plasticizer is melted, add the core material powder and stir for 20 hours;

[0038] (2) Core pressing

[0039] The core is pressed on the core injection machine, the mold temperature is controlled at 25-30°C, the slurry material temperature is controlled at 95-105°C, and the holding time is 45s.

[0040] After testing, the fluidity of the alumina core slurry prepared by the method is 170°-190°; after the core is fired, its sintering shrinkage is 0....

Embodiment 3

[0042] (1) Preparation of alumina core slurry

[0043] 40-50wt% F220 fused corundum powder, 44-54wt% F600 fused corundum powder, 5wt% spherical Al with a diameter of 1±0.5μm 2 o 3 and 1wt% TiO 2 Add it into the ball mill tank, and mix the ball for 2.5 to 3 hours to get the core material powder;

[0044] Add a plasticizer with a weight of 15-20% of the weight of the core powder into the agitator, the plasticizer is composed of 93wt% paraffin, 5% beeswax and 2wt% high-pressure polyethylene, and the agitator is heated to 115±5°C , after the plasticizer is melted, add the core material powder and stir for 25 hours;

[0045] (2) Core pressing

[0046] The core is pressed on the core injection machine, the mold temperature is controlled at 25-30°C, the slurry material temperature is controlled at 95-105°C, and the holding time is 55s.

[0047] After testing, the fluidity of the alumina core slurry prepared by the method is 250°-270°; after the core is fired, its sintering shrin...

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Abstract

The invention aims at solving the problem that the liquidity of the aluminum oxide mould core slurry is poor in the prior art, and provides a method of improving aluminum oxide mould core slurry, belonging to the technical field of manufacturing of the aluminum oxide ceramic mould cores. The method comprises the following steps: adding spherical matrix powder with particle diameter of about 1 mu m into matrix powder electrically-fused corundum powder of normal particles and TiO2 to mix to obtain a mixture, and then adding a plasticizer into the mixture to obtain mould core slurry by stirring; controlling the temperature of a mould of a mould core injection-molding machine to 25-35 DEG C, controlling the temperature of the slurry to 95-105 DEG C and injecting the slurry into the injection-molding machine for pressing and molding to obtain the mould core, wherein the pressure holding time is 45-55 seconds. According to the method of improving the liquidity of aluminum oxide mould core slurry disclosed by the invention, a little spherical matrix micro fine powder is added to improve the liquidity of the mould core slurry, so that the liquidity of the slurry is improved, the mould core is prevented from being deformed during drawing and placing, the mould temperature is lowered, and the sintering shrinkage degree of the mould core is also reduced, and therefore, the product qualification rate of thin-wall directional blades and single crystal blades is increased.

Description

technical field [0001] The invention belongs to the technical field of manufacturing alumina ceramic cores, in particular to a method for improving the fluidity of alumina core slurry. Background technique [0002] With the continuous advancement of my country's aerospace technology, ceramic cores are more and more widely used in the aviation field, especially for casting directional or single-crystal hollow blades, which require the production of ceramic cores with complex structures. At present, the conventional pressing process of the complex structure ceramic core is heating the mold to 40-45°C → pressing the core → orthopedic tire correction. This process is used by most domestic units to produce complex inner cavity structure ceramic cores. Due to the poor fluidity of the core slurry, the mold is often heated to 40-45°C for the compression molding of complex structure ceramic cores, so that the core cannot be completely cooled in the mold, and the stress of the core d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/63
Inventor 张世东刘艳邹建波孙长波
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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