Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 4 Cited by
  • 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%, while the casting process of niobium-silicon-based alloy blades is relatively complicated, and the time from the preparation of the wax mold containing the ceramic core to the casting of the blade is generally It takes more than two weeks, and the core will be in contact with water-based paint during use. The core prepared by the above patent is prone to hydration when exposed to water, resulting in reduced core strength or even collapse. It is difficult to apply to the actual niobium silicon Batch Casting of Base Alloy Blades

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. Mixing

[0023] Put 5wt% hafnium oxide fused powder with a particle size of 320 mesh, 94wt% yttrium oxide fused powder with a particle size of 320 mesh, and 1wt% aluminum oxide whisker with an aspect ratio of 10:1 in a V-shaped mixer for mixing 2h, obtain the ceramic powder, keep the ceramic powder at 120°C for use;

[0024] Step 2. Preparation of core slurry

[0025] Add the plasticizer composed of 55wt% paraffin, 35wt% beeswax, 3wt% polyethylene and 7wt% oleic acid into the mixer; % ceramic powder and 5wt% plasticizer, slowly add the ceramic powder in step 1 to the plasticizer. After all the ceramic powders are added, continue to stir at a speed of 100r / min for 10h to obtain a mixed slurry, which is transferred to a container for natural cooling to obtain a cake for use.

[0026] Step 3. Die-casting core

[0027] Melt the cake in step 2 at 120°C before die-casting, and keep it warm at this temperature for use, preheat the mold at 40°C, and use a ceramic co...

Embodiment 2

[0031] Step 1. Mixing

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

[0033] Step 2. Preparation of core slurry

[0034] A plasticizer composed of 70wt% paraffin, 23wt% beeswax, 2wt% polyethylene and 5wt% oleic acid is added to the mixer; the temperature of the mixer is adjusted at 110 ° C. % ceramic powder and 13wt% plasticizer, slowly add the ceramic powder in step 1 to the plasticizer. After all the ceramic powders were added, the stirring was continued at a speed of 150 r / min for 6 hours to obtain a mixed slurry, which was transferred to a container for natural cooling to obtain a cake for use.

[0035] Step 3. Die-casting core

[0036] Melt the cake in step 2 at 110°C before die-casting, and keep it warm at this temp...

Embodiment 3

[0040] Step 1. Mixing

[0041]Put 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% aluminum oxide whisker with an aspect ratio of 50:1 in a V-shaped blender for mixing 5h, obtain the ceramic powder, keep the ceramic powder at 130°C for use;

[0042] Step 2. Preparation of core slurry

[0043] Add the plasticizer composed of 80wt% paraffin, 15wt% beeswax, 1wt% polyethylene and 4wt% oleic acid into the mixer; % ceramic powder and 20wt% plasticizer, slowly add the ceramic powder in step 1 to the plasticizer. After all the ceramic powders are added, continue to stir at a speed of 200r / min for 2 hours to obtain a mixed slurry, which is transferred to a container for natural cooling to obtain a cake for use.

[0044] Step 3. Die-casting core

[0045] Melt the cake in step 2 at 130°C before die-casting, and keep it warm at this temperature for use, preheat the mold at 45°C, and use a cer...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com