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Alumina-based ceramic core for directional solidification and preparation method thereof

A directional solidification, alumina technology, applied in the field of gas turbine components, can solve the problems of large sintering shrinkage, unstable alumina-based ceramic core performance, and high sintering temperature, and achieve the effect of reducing sintering shrinkage

Active Publication Date: 2014-08-13
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an alumina-based ceramic core for directional solidification in view of the problems of unstable performance, large firing shrinkage and high firing temperature of the above-mentioned alumina-based ceramic core.

Method used

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  • Alumina-based ceramic core for directional solidification and preparation method thereof
  • Alumina-based ceramic core for directional solidification and preparation method thereof

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Experimental program
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specific Embodiment 1

[0034] An alumina-based ceramic core for directional solidification, which is characterized in that it uses EC95 fused mullite as the base material, and the EC95 fused mullite is made of high-quality alumina powder plus a mineralizer with a weight percentage of 2%. It is smelted at a high temperature of 2100°C in a furnace. Smelted EC95 fused mullite with a-Al 2 o 3 , 3Al 2 o 3 2SiO2 2 is the main crystal, in which α-Al 2 o 3 Content 93%, 3Al 2 o 3 2SiO2 2 Content 7%.

[0035] A method for preparing an alumina-based ceramic core for directional solidification, comprising the steps of:

[0036] 1. Weigh the powder: crush and reshape the smelted EC95 fused mullite, remove iron by magnetic separation, sieve into powders with particle sizes of F200, F320, and F600, and pickle and dry. Weigh 15% F200 EC95, 50% F320 EC95, 15% F600 EC95, 10% zirconium silicate powder, 5% silica powder, 2% titanium dioxide, 3% Aluminum powder.

[0037] 2. Ball mixing: Add oleic acid accou...

specific Embodiment 2

[0046] An alumina-based ceramic core for directional solidification, which is characterized in that it uses EC95 fused mullite as the base material, and the EC95 fused mullite is made of high-quality alumina powder plus a mineralizer with a weight percentage of 3.5% in the arc It is smelted at a high temperature of 2150°C in a furnace. Smelted EC95 fused mullite with a-Al 2 o 3 , 3Al 2 o 3 2SiO2 2 is the main crystal, in which α-Al 2 o 3 Content 88%, 3Al 2 o 3 2SiO2 2 Content 12%.

[0047] A method for preparing an alumina-based ceramic core for directional solidification, comprising the steps of:

[0048] 1. Weigh the powder: crush and reshape the smelted EC95 fused mullite, remove iron by magnetic separation, sieve into powders with particle sizes of F200, F320, and F600, and pickle and dry. Weigh 10% F200 EC95, 45% F320 EC95, 12% F600 EC95, 20% zirconium silicate powder, 2% silica powder, 1% titanium dioxide, 10% Aluminum powder.

[0049] 2. Ball mixing: Add ol...

specific Embodiment 3

[0058] An alumina-based ceramic core for directional solidification, which is characterized in that it uses EC95 fused mullite as the base material, and the EC95 fused mullite is made of high-quality alumina powder plus a mineralizer with a weight percentage of 5.5% in the arc It is smelted at a high temperature of 2200°C in a furnace. Smelted EC95 fused mullite with a-Al 2 o 3 , 3Al 2 o 3 2SiO2 2 is the main crystal, in which α-Al 2 o 3 Content 80.5%, 3Al 2 o 3 2SiO2 2 The content is 19.5%.

[0059] A method for preparing an alumina-based ceramic core for directional solidification, comprising the steps of:

[0060]1. Weigh the powder: crush and reshape the smelted EC95 fused mullite, remove iron by magnetic separation, sieve into powders with particle sizes of F200, F320, and F600, and pickle and dry. Weigh 12% F200 EC95, 40% F320 EC95, 13% F600 EC95, 25% zirconium silicate powder, 1% silica powder, 4% titanium dioxide, 5% Aluminum powder.

[0061] 2. Ball mixin...

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Abstract

The invention relates to an alumina-based ceramic core for directional solidification and a preparation method thereof. The refractory materials used in the alumina-based ceramic core include EC95 fused mullite, zirconium silicate, silica powder, titanium dioxide powder, aluminum pink. The powder contains 65-95% EC95 fused mullite, 5-30% zirconium silicate, 2-8% silicon dioxide powder, 1-5% titanium dioxide powder and 1-10% aluminum powder in percentage by weight. Among them, in EC95 fused mullite, F200 powder accounts for 10-30%, F320 powder accounts for 40-70%, and F600 powder accounts for 10-30%. The preparation method is as follows: ball milling and mixing the above-mentioned powder materials evenly, putting them into molten plasticizer for mixing, and hot-pressing injection molding on a ceramic core molding machine. The hot-press injection molded ceramic core is put into a box-type resistance furnace for firing after trimming and calibration. After being released from the furnace, the ceramic core is strengthened at high temperature and at room temperature with high temperature strengthening agent and room temperature strengthening agent. The alumina-based ceramic core prepared by the invention has the characteristics of high high-temperature strength, good creep resistance, small firing shrinkage, low firing temperature and good metallurgical and chemical properties.

Description

technical field [0001] The invention relates to a gas turbine component, in particular to an alumina-based ceramic core for directional solidification and a preparation method thereof. The alumina-based ceramic core has high high-temperature strength, good creep resistance, small firing shrinkage, low firing temperature, and no chemical reaction with high-temperature alloy melt. Not only can it be used to cast small-sized equiaxed, oriented and single-crystal blades for aero-engines, but it can also be used to cast large-sized equiaxed, oriented and single-crystal blades for heavy-duty gas turbines. Background technique [0002] High-pressure turbine blades are important components of gas turbines. In order to continuously increase the gas inlet temperature before the turbine, countries around the world have developed from solid blades to hollow blades, from polycrystalline blades to the current directional and single crystal blades. The purpose is to continuously improve ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/622
Inventor 娄延春于波苏贵桥刘孝福李长春郭新力税国彦李彪关阳
Owner SHENYANG RES INST OF FOUNDRY
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