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Porous silicon-based ceramic core suitable for double-wall blades and preparation method of core

A porous silicon-based, ceramic core technology, applied in cores, casting molding equipment, casting molds, etc., can solve the problems of unqualified blade quality, core shrinkage deformation, complex structure, etc., and achieve short production time and high molding rate The effect of high and high apparent porosity

Inactive Publication Date: 2019-05-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of blade cooling technology, the structure of the ceramic core forming a double-walled hollow cavity is more complicated, and the thickness of the exhaust side is only 0.5mm, which is very easy to cause deformation and fracture
Therefore, the working conditions for the thin-walled part of the ceramic core are more severe; however, the existing ceramic cores often cannot meet the requirements of use, and the ceramic core with such a complex structure can easily cause sintering cracks and deformation during the sintering process; at the same time, in the blade During the pouring process, the ceramic core has to withstand the immersion of molten metal for a long time, and it is very easy to shrink, deform or even break the core, resulting in unqualified blade quality

Method used

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  • Porous silicon-based ceramic core suitable for double-wall blades and preparation method of core
  • Porous silicon-based ceramic core suitable for double-wall blades and preparation method of core
  • Porous silicon-based ceramic core suitable for double-wall blades and preparation method of core

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preparation example Construction

[0041] The present invention provides a method for preparing the porous silicon-based ceramic core described in the above technical solution, comprising the following steps:

[0042] (1) heat preservation after mixing quartz glass powder, fused mullite powder and zirconium silicate powder, obtain ceramic powder;

[0043] (2) thermally mixing the ceramic powder with a plasticizer to obtain a prefabricated material;

[0044] (3) Sequentially pressing and shaping the prefabricated material to obtain a biscuit;

[0045] (4) Sintering and strengthening treatment are performed on the green body in sequence to obtain a porous silicon-based ceramic core suitable for double-wall blades.

[0046] In the invention, the quartz glass powder, the fused mullite powder and the zirconium silicate powder are mixed and then kept warm to obtain the ceramic powder. In the present invention, the mixing is preferably carried out in a ball mill; the heat preservation is preferably carried out in an...

Embodiment 1

[0062] (1) Prepare ceramic powder: Stir 80 parts of quartz glass powder, 10 parts of mullite powder, and 10 parts of zirconium silicate powder in parts by mass, then put them into an incubator and keep them warm for 10 hours at a temperature of 120°C. , to obtain ceramic powder; the quartz glass powder is composed of quartz glass powder with a particle size of (0,10) μm, [10,30) μm, [30,50) μm and [50,95] μm in mass ratio 20.32: 36.95: 29.61: 13.12, the mullite powder is mixed with 200 mesh and 325 mesh mullite powder with a mass ratio of 1:1, and the zirconium silicate powder is formed with a mass ratio of 1: 1. It is made by mixing 200 mesh and 325 mesh zirconium silicate powder.

[0063] (2) Preparation of prefabricated materials: Add the ceramic powder obtained in step (1) to the plasticizer (ceramic casting wax) at a mass ratio of 100:16.5 at a temperature of 90°C and stir at a stirring speed of 90r / min , get the prefabricated material;

[0064] (3) Pressing and orthope...

Embodiment 2

[0078] (1) Prepare ceramic powder: Stir 75 parts of quartz glass powder, 10 parts of mullite powder, and 15 parts of zirconium silicate powder in parts by mass, and then put them in an incubator and keep them warm for 10 hours at a temperature of 120°C. , to obtain ceramic powder; the quartz glass powder is composed of quartz glass powder with a particle size of (0,10) μm, [10,30) μm, [30,50) μm and [50,95] μm in mass ratio 25.43:39.14:30.84:18.12 mixed, the mullite powder is mixed with 200 mesh and 325 mesh mullite powder with a mass ratio of 2:1, and the zirconium silicate powder is formed with a mass ratio of 1.5: 1. It is made by mixing 200 mesh and 325 mesh zirconium silicate powder.

[0079] (2) Preparation of prefabricated material: Add the ceramic powder obtained in step (1) to the plasticizer (ceramic casting wax) at a mass ratio of 100:17.6 at a temperature of 90°C and stir at a stirring speed of 90r / min , get the prefabricated material;

[0080] (3) Pressing and o...

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Abstract

The invention relates to the technical field of precision casting, and provides a porous silicon-based ceramic core suitable for double-wall blades. The core is prepared from ceramic powder and a plasticizer, wherein the ceramic powder comprises quartz glass powder, fused mullite powder and zirconium silicate powder; the plasticizer is ceramic core casting wax; and the mass ratio of the quartz glass powder, the fused mullite powder and the zirconium silicate powder is (70-80): (10-20): (10-20). The high-temperature performance of the porous silicon-based ceramic core is improved through the selection of raw materials and the control of the content, the shrinkage and deformation of the ceramic core in the sintering and pouring processes are reduced, and the application requirements of the increasingly-complex double-wall blade ceramic core can be met. The invention provides a porous silicon-based ceramic core preparation method, which has the advantages of simple operation, high moldingrate of the ceramic core, short production time and low production cost.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a porous silicon-based ceramic core suitable for double-wall blades and a preparation method thereof. Background technique [0002] As the thrust-to-weight ratio of aero-engines continues to increase, the temperature at the front inlet of the turbine continues to increase, and the requirements for the temperature-bearing capacity of the blades are also getting higher and higher. The temperature bearing capacity of advanced engine blades at the front inlet of the turbine has been developed from the first generation of 1200K to the active temperature of 1950K. With the improvement of aeroengine manufacturing technology, the temperature bearing capacity of the aeroengine with a thrust-to-weight ratio of 15-20 before the turbine inlet will increase. Up to 2250 ~ 2350K. However, currently limited by the melting point of the metal, the method of alloying and surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/622C04B35/626B22C9/10C04B41/83C04B41/82
Inventor 玄伟东杜路发肖祖德张雅君潘文轩任忠鸣
Owner SHANGHAI UNIV
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