Preparation method of ceramic core for directionally solidifying niobium-silicon-based alloy hollow turbine blade

A technology for ceramic cores and turbine blades, which is applied in the field of investment casting cores, can solve the problems of complex casting process, reduced core strength, and difficulty in satisfying the requirements at the same time, and achieves high surface quality, broad application prospects and high dimensional accuracy. Effect

Inactive Publication Date: 2018-12-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used silicon-based, aluminum-based and other ceramic cores are difficult to meet the above requirements at the same time
Patent CN102815940A discloses a calcium oxide and zirconia composite ceramic core for investment casting of niobium-silicon-based alloys. The ceramic core can withstand high temperatures of 2000°C without deformation, has good high-temperature chemical inertia, and can The core is removed by boiling water cooking, but the content of calcium oxide in the core in this patent is as high as 30-50wt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] Step one, mixing

[0023] Put 5wt% of hafnium oxide fused powder with a particle size of 320 mesh, 94wt% of yttrium oxide fused powder with a particle size of 320 mesh, and 1wt% of alumina whiskers with a length-to-diameter ratio of 10:1 in a V-type mixer. 2h, obtain ceramic powder, and keep the ceramic powder at 120°C for use;

[0024] Step 2: Preparation of core slurry

[0025] A plasticizer consisting of 55wt% paraffin wax, 35wt% beeswax, 3wt% polyethylene and 7wt% oleic acid was added to the blender; the temperature of the blender was adjusted to 120°C, and after the plasticizers were all melted, it was 95wt% % Ceramic powder and 5wt% plasticizer, slowly add the ceramic powder in step one to the plasticizer. After all the ceramic powders are added, continue to stir at a speed of 100r / min for 10 hours to obtain a mixed slurry. The mixed slurry is transferred to a container and cooled naturally to obtain a cake for use.

[0026] Step three, die casting cor...

Example Embodiment

[0030] Example 2

[0031] Step one, mixing

[0032] Put 15wt% of hafnium oxide fused powder with a particle size of 325 mesh, 82wt% of yttrium oxide fused powder with a particle size of 325 mesh, and 3wt% of alumina whiskers with an aspect ratio of 30:1 in a V-type mixer. 4h, obtain ceramic powder, and heat the ceramic powder at 110°C for later use;

[0033] Step 2: Preparation of core slurry

[0034] A plasticizer consisting of 70wt% paraffin wax, 23wt% beeswax, 2wt% polyethylene and 5wt% oleic acid was added to the blender; the temperature of the blender was adjusted to 110°C, and after the plasticizer was completely melted, it was 87wt% % Ceramic powder and 13wt% plasticizer, slowly add the ceramic powder in step one to the plasticizer. After all the ceramic powders are added, stirring is continued at a speed of 150r / min for 6 hours to obtain a mixed slurry, and the mixed slurry is transferred to a container for natural cooling to obtain a cake for use.

[0035] Step three, die ca...

Example Embodiment

[0039] Example 3

[0040] Step one, mixing

[0041] 25wt% hafnium oxide fused powder with a particle size of 330 mesh, 70wt% yttrium oxide fused powder with a particle size of 330 mesh, and 5wt% of alumina whiskers with an aspect ratio of 50:1 were mixed in a V-type mixer 5h, obtain ceramic powder, heat the ceramic powder at 130°C for later use;

[0042] Step 2: Preparation of core slurry

[0043] A plasticizer consisting of 80wt% paraffin wax, 15wt% beeswax, 1wt% polyethylene and 4wt% oleic acid was added to the blender; the temperature of the blender was adjusted to 130°C. After the plasticizer was completely melted, the plasticizer was 80wt% % Ceramic powder and 20wt% plasticizer, slowly add the ceramic powder in step one to the plasticizer. After all the ceramic powders are added, continue to stir at a speed of 200r / min for 2h to obtain a mixed slurry. The mixed slurry is transferred to a container for natural cooling to obtain a cake for use.

[0044] Step three, die casting cor...

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PUM

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Abstract

The invention discloses a preparation method of of a ceramic core for directionally solidifying a niobium-silicon-based alloy hollow turbine blade. The preparation method comprises: S1, carrying out mixing on hafnium oxide powder, yttrium oxide powder and aluminium oxide crystal whiskers, and after obtaining ceramic powder, carrying out heat preservation; S2, according to a proportion of 80 to 95wt% of ceramic powder and 5 to 20wt% of a plasticizer, after adding the ceramic powder into the molten plasticizer, stirring for 2 to 10h, and after obtaining core slurry, cooling into a material cake;S3, melting the material cake at a temperature of 110 to 130 DEG C, preheating a die at a temperature of 35 to 45 DEG C, and pressing a ceramic core body by adopting a ceramic core green body; S4, placing the ceramic core green body in lightweight magnesium oxide to carry out de-waxing and roasting so as to obtain the ceramic core for directionally solidifying the niobium-silicon-based alloy turbine blade.

Description

technical field [0001] The invention relates to the technical field of investment casting cores, in particular to a preparation method for directionally solidified niobium-silicon-based alloy hollow turbine blade ceramic cores. Background technique [0002] The main way to improve the thrust-to-weight ratio and working efficiency of an aero-engine is to continuously increase the temperature of the air inlet of the turbine and reduce the overall weight of the engine. This puts forward higher requirements on the temperature-bearing performance of the engine material, especially the blade material. Hot end part - the temperature bearing capacity of the hollow turbine blade directly determines the performance of the engine. At present, the operating temperature limit of the third-generation nickel-based single crystal superalloy is 1150 °C, and there is limited space to increase its operating temperature through thermal barrier coating and air cooling technology. Thrust-to-weig...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/632C04B35/634C04B35/66C04B35/81C04B35/505B22C9/10
CPCB22C9/10C04B35/505C04B35/622C04B35/632C04B35/63408C04B35/66C04B35/803C04B2235/3244C04B2235/5276
Inventor 李飞孙宝德
Owner SHANGHAI JIAO TONG UNIV
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