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A method for improving high temperature performance of alumina ceramic core

An alumina ceramic, high-temperature performance technology, applied in the core, mold, mold composition and other directions, can solve the problem of not meeting the needs of casting single crystal blades above 1550 °C, poor deflection at 1600 °C, etc., to improve the deflection, Deflection improvement, the effect of improving high temperature performance

Inactive Publication Date: 2016-06-22
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 solve the problem that the domestic alumina ceramic core has a deflection difference of 1600°C and cannot meet the needs of casting single crystal blades above 1550°C. The present invention provides a method for improving the high temperature performance of the alumina ceramic core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Make 5 alumina ceramic cores:

[0035] (1) Preparation of alumina core slurry: F220 fused corundum powder with 45% by weight, F600 type porous high-purity alumina powder with 35% by weight, F600 fused corundum powder with 19% by weight and 1% TiO by weight 2 , added to the ball mill tank, ball milled and mixed for 2 to 3 hours to obtain the core material powder;

[0036] Then add plasticizer with a weight of 15% to 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, heated to 115 ± 5 ° C, After the plasticizer is melted, add the core material powder into the mixer and stir for 20-25 hours to obtain the alumina core slurry;

[0037] (2) Core pressing: control the mold temperature of the core injection machine at 30-35°C, control the temperature of the slurry material at 100±5°C, inject the slurry into the mold of the injection machine and press it, and hold the pressure t...

Embodiment 2

[0056] Make 5 alumina ceramic cores:

[0057] (1) Preparation of alumina core slurry: 50% by weight of F220 fused corundum powder, 39% by weight of F600 type porous high-purity alumina powder, 10% by weight of F600 type fused corundum powder and 1% TiO by weight 2 , added to the ball mill tank, ball milled and mixed for 2 to 3 hours to obtain the core material powder;

[0058] Then add plasticizer with a weight of 15% to 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, heated to 115 ± 5 ° C, After the plasticizer is melted, add the core material powder into the mixer and stir for 20-25 hours to obtain the alumina core slurry;

[0059] (2) Core pressing: control the mold temperature of the core injection machine at 30-35°C, control the temperature of the slurry material at 100±5°C, inject the slurry into the mold of the injection machine and press it, and hold the pressure ti...

Embodiment 3

[0068] Make 5 alumina ceramic cores:

[0069] (1) Preparation of alumina core slurry: 40% by weight of F220 fused corundum powder, 47% by weight of F600 type porous high-purity alumina powder, 12% by weight of F600 type fused corundum powder and 1% TiO by weight 2 , added to the ball mill tank, ball milled and mixed for 2 to 3 hours to obtain the core material powder;

[0070] Then add plasticizer with a weight of 15% to 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, heated to 115 ± 5 ° C, After the plasticizer is melted, add the core material powder into the mixer and stir for 20-25 hours to obtain the alumina core slurry;

[0071] (2) Core pressing: control the mold temperature of the core injection machine at 30-35°C, control the temperature of the slurry material at 100±5°C, inject the slurry into the mold of the injection machine and press it, and hold the pressure ti...

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Abstract

The invention provides a method for improving the high-temperature properties of an alumina based ceramic core for solving the problem that a domestic alumina based ceramic core has deflection difference at 1600 DEG C and fails to meet the requirement of pouring of single crystal blades at above 1550 DEG C, and belong to the technical field of alumina based ceramic core manufacturing. The method comprises the following steps: adding porous high-purity alumina to alumina based ceramic core powder, performing core pressing, primary roasting, primary strengthening by use of a high-temperature strengthening liquid, secondary roasting, secondary strengthening by use of the high-temperature strengthening liquid, third strengthening by use of the high-temperature strengthening liquid and primary strengthening by use of a low-temperature strengthening liquid, and finally roasting to obtain the core product. After the alumina based ceramic core is treated by use of the method, the deflection of the alumina based ceramic core is reduced to 0-0.5mm; after double roasting and double strengthening, the strength of the core is above 15Ma; after double roasting and triple strengthening, the strength of the core can be above 25Ma; as a result, the high-temperature properties of the alumina based ceramic core are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing alumina ceramic cores, in particular to a method for improving the high-temperature performance of alumina ceramic cores. Background technique [0002] With the development of modern aviation technology, the investment casting technology of parts such as blades has been continuously developed. Ceramic cores for investment casting, especially ceramic cores for directional solidification and single-crystal blades, must have high-temperature performance that does not deform, break, and is not easy to react violently with molten metal. Because quartz glass has a small thermal expansion coefficient , high thermal stability and easy to react with strong alkali, so silicon-based ceramic cores based on it have been widely used. However, when the operating temperature is higher than 1550°C, the high-temperature stability of the silicon-based ceramic core decreases, and it is prone to creep deformati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10C04B35/10C04B35/622C04B35/64
Inventor 张世东陈仲强邹建波孙革
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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