A method for forming a silicon-based ceramic core

A technology of ceramic core and molding method, applied in the field of ceramic core molding, can solve the problems affecting product uniformity, easy to corrode production equipment, unfavorable technological application, etc., to achieve uniform structure of molded products, improve mechanical properties, and improve batch The effect of substability

Active Publication Date: 2021-07-13
江苏省陶瓷研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It adopts the method of directly adding the sol into the ceramic core powder slurry and stirring to form it. Although the sol and drying and sintering are also used, the overall technical scheme is complicated, which is not conducive to the process application, and the process uses water as a solvent, which is easy to cause ceramic powder. Subsidence of the body will affect the uniformity of the product. At the same time, inorganic salts are introduced as curing agents in this process, which is easy to corrode the production equipment, and the mass production of this process is very difficult.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use the sieving method to select fused silica powder with a particle size between 25µm and 75µm as the skeleton raw material, and mix it with the binder with a planetary mixer, and the mass fraction of the binder is 15wt%;

[0023] Put the feed material into the core molding machine for injection molding, then put the green body in the filler for degreasing and sintering, the sintering temperature is 1250°C;

[0024] Measure tetraethyl orthosilicate (TEOS), deionized water, ethanol and hydrochloric acid according to the molar ratio of 1:4:10:0.01; sequentially add TEOS, ethanol and deionized water into the container, place on a stirrer and stir; Add hydrochloric acid (0.3mol / L) into the container, and stir at room temperature (25°C) for 30 minutes;

[0025] Add concentrated ammonia water accounting for 5‰ of the volume of the sol into the silica sol, and stir rapidly for 1 min. Dip the sintered core skeleton into the sol and vacuumize it;

[0026] After the system for...

Embodiment 2

[0030] Use the sieving method to select fused silica powder with a particle size between 25µm and 75µm as the skeleton raw material, and mix it with the binder with a planetary mixer, and the mass fraction of the binder is 20wt%;

[0031] Put the feed material into the core molding machine for injection molding, and then put the green body in the filler for degreasing and sintering, and the sintering temperature is 1200°C;

[0032] Measure TEOS, deionized water, ethanol and hydrochloric acid according to the molar ratio of 1:12:20:0.01; sequentially add TEOS, ethanol and deionized water into the container, and stir on the stirrer; hydrochloric acid (0.2mol / L) was added to the container, and stirred at room temperature (25°C) for 30 minutes.

[0033] Add concentrated ammonia water accounting for 5‰ of the volume of the sol into the silica sol, and stir rapidly for 3 minutes. Dip the sintered core skeleton into the sol and vacuumize it;

[0034] After the system forms a gel, ...

Embodiment 3

[0038] Use the sieving method to select fused silica powder with a particle size between 25µm and 75µm as the skeleton raw material, and mix it with the binder with a planetary mixer, and the mass fraction of the binder is 13wt%;

[0039] Put the feed material into the core molding machine for injection molding, and then put the green body in the filler for degreasing and sintering, and the sintering temperature is 1200°C;

[0040] Measure TEOS, deionized water, ethanol and hydrochloric acid according to the molar ratio of 1:8:20:0.01; sequentially add TEOS, ethanol and deionized water into the container, and stir on the stirrer; hydrochloric acid (0.2mol / L) added to the container, stirred at room temperature (25° C.) for 30 minutes;

[0041] Add concentrated ammonia water accounting for 5‰ of the volume of the sol into the silica sol, and stir rapidly for 3 minutes. Dip the sintered core skeleton into the sol and vacuumize it;

[0042] After the system forms a gel, take ou...

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Abstract

A silicon-based ceramic core molding method, a two-step method for preparing a silicon-based ceramic core: the first step is to prepare a silicon oxide core blank by an injection molding process; the second step: sol-gel combined with supercritical drying The process introduces nano- and sub-micron particles into the rough billet to enhance the comprehensive performance of the silicon-based ceramic core. Compared with the process of preparing silicon-based ceramic cores by injection molding alone, the process of the present invention is more controllable, the shrinkage rate of the prepared product is smaller, the structure of the product is more uniform, the strength is higher, and the silicon-based ceramic core can be greatly improved. The yield of the base ceramic core.

Description

technical field [0001] The invention belongs to the field of ceramic core molding, and relates to a process for preparing silicon oxide-based ceramic cores. Background technique [0002] Silicon-based ceramic core has the advantages of small expansion coefficient, good thermal shock resistance, high mechanical strength, and easy core removal. It is currently the most widely used core material in the field of hollow turbine blades. [0003] One of the cores of the silicon-based ceramic core preparation process is to obtain powders with appropriate gradation. At present, particle grading is mainly carried out by mixing powders of different particle sizes. Under the existing technical conditions, it is impossible to effectively control the particle size distribution and content of the fine powder in the powder, and it is also impossible to disperse the fine powder evenly, which will greatly affect the dimensional stability and mechanical properties of the core. [0004] After...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/82C04B35/14C04B35/624C04B35/64
CPCC04B35/14C04B35/624C04B35/64C04B35/82
Inventor 乔经纬徐泽跃陆丽芳伦文山武振飞庞佳敏
Owner 江苏省陶瓷研究所有限公司
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