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Method for quickly forming and manufacturing ceramic core

A technology of ceramic core and manufacturing method, applied in the field of rapid prototyping and manufacturing of ceramic core and precision casting ceramic core, can solve the problems of long production cycle, inability to meet the rapid response of new product development, and high mold cost, Achieve the effect of high production efficiency, convenient design modification and adjustment, and high degree of machine automation

Active Publication Date: 2010-11-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a rapid prototyping manufacturing method for ceramic cores. This method does not require expensive molds, is simple, low-consumption and high-efficiency, and the structure of the manufactured ceramic cores can be modified at will, which can meet the overall, The rapid prototyping manufacturing requirements of various ceramic cores such as split parts, thus solving the problems of long production cycle, high mold cost, and inability to meet the needs of rapid response to new product development when traditional manufacturing methods are used to manufacture ceramic cores for aero-engine hollow blades Outstanding issue

Method used

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  • Method for quickly forming and manufacturing ceramic core
  • Method for quickly forming and manufacturing ceramic core

Examples

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Effect test

example 1

[0029] (1) Add a low-temperature strengthening agent to the zirconia ceramic powder, mix and grind in a planetary mill, and sieve to make a uniformly mixed and viscous ceramic powder, which is stored in a dry seal; the low-temperature strengthening agent is epoxy resin powder, Its mass percentage content is 5%;

[0030] (2) Perform SLS rapid prototyping with the mixed and milled ceramic powder, and use laser sintering to manufacture the green body of the ceramic core;

[0031] (3) Pretreat the green parts of the ceramic core, that is, low-temperature strengthening treatment:

[0032] 1) Blow the green body of the ceramic core formed by SLS with compressed air or use a brush to remove the floating powder on the surface of the ceramic core; dry the cleaned ceramic core green body for 4 hours Hours, so that the composition and strength of the ceramic core green body are evenly diffused, and then dried in an oven at 150 ° C for 30 minutes to prevent the powder on the surface of t...

example 2

[0038](1) Ceramic powder: FC-A alumina powder is used as the forming powder, α-A12O3 (purity > 95%), 20% SiO2 (analytical pure 20 μm) is the original powder.

[0039] A12O3 powder is sieved with 140 mesh, and low-temperature strengthening agent is added, wherein the low-temperature strengthening agent is phenolic resin powder, and its mass percentage content is 6%; the powder prepared according to the proportion is mechanically mixed in the powder mixer, and stored in a dry seal;

[0040] (2) Perform SLS rapid prototyping with the mixed and milled ceramic powder, and use laser sintering to manufacture the green body of the ceramic core;

[0041] (3) Pretreat the green parts of the ceramic core, that is, low-temperature strengthening treatment:

[0042] (3.1) Blow the green parts of the ceramic core after SLS forming with compressed air or use brushes to remove floating powder on the surface of the ceramic core;

[0043] (3.2) Dry the cleaned ceramic core green body by itself,...

example 3

[0050] (1) Ceramic powder: silicon carbide ceramics;

[0051] Low-temperature strengthening treatment: Add a low-temperature strengthening agent to the ceramic mixed powder, in which the low-temperature strengthening agent is nylon-11, and its mass percentage content is 7%; it is mixed and milled in a planetary mill and sieved to make a uniform and sticky product. Permanent ceramic powder for SLS rapid prototyping, dry and sealed;

[0052] (2) Carry out SLS rapid prototyping with the mixed SLS rapid prototyping ceramic powder to manufacture the green part of the ceramic core;

[0053] (3) Pretreatment before high temperature strengthening:

[0054] 1) Blow the green parts of the ceramic core after SLS forming with compressed air, brush with a brush or rinse with water to remove floating powder on the surface of the ceramic core;

[0055] 2) Place the cleaned ceramic core green body to dry by itself for 10 hours, and then dry it in an oven at 150°C for 1.5 hours to make the c...

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Abstract

The invention relates to a method for quickly forming and manufacturing a ceramic core, which comprises the following steps of: uniformly mixing a low temperature reinforcer and ceramic powder and then performing SLS quick forming on the mixture; performing pretreatment on the obtained ceramic core blank; removing the low temperature reinforcer from the ceramic core blank, and soaking the blank into a high temperature adhesive for presintering and degreasing; and sintering at a high temperature to obtain a final integral ceramic core product. The method has the advantages that: (1) the ceramic core of a hollow radiating blade with complex section can be integrally manufactured; (2) a mold is avoided, flexibility is high, and various ceramic workpieces can be quickly formed; and (3) process flow is simple and production efficiency is high. The ceramic core of the hollow radiating blade which is manufactured by the method has the advantages of high heat conductivity, light mass, accurate size and the like.

Description

technical field [0001] The invention relates to the technical field of rapid prototyping, in particular to a rapid prototyping manufacturing method of a ceramic core, which is especially suitable for the rapid prototyping of precision casting ceramic cores of turbine hollow blades. Background technique [0002] Turbine hollow blades are the core components of high-performance power generation equipment and aero-engines. They are listed as the first key parts because they are located in the parts with the highest temperature, the most complex stress and the harshest environment. Sir Jhon Rose, CEO of the British Roll-Royce company, called it The "jewel in the crown" of manufacturing. The application of vortex cooling technology and film cooling technology makes the internal structure of the blade more complicated. At present, the manufacturing of turbine blades mainly adopts the investment casting process. The prior art process is complex, the product development cycle is l...

Claims

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Application Information

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IPC IPC(8): B22C9/10
Inventor 史玉升沈其文张升闫春泽蔡道生
Owner HUAZHONG UNIV OF SCI & TECH
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