Silica-based ceramic core and preparation method thereof

A ceramic core and silicon-based technology, applied in the field of silicon-based ceramic cores and their preparation, can solve the problems of easy corrosion on the surface of castings, difficult to dissolve and remove, and high chemical stability, and achieve low sintering shrinkage and desorption. The effect of easy core and excellent high temperature bending performance

Pending Publication Date: 2019-10-29
兴化市兴东铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina-based core has a high melting point and excellent flexural strength, but it has high chemical stability and is not easy to be dissolved and removed in a strong alkaline environment. The surface of the casting is easily corroded and the scrap rate is high.

Method used

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  • Silica-based ceramic core and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 60 parts of quartz glass powder, 30 parts of zircon sand, and 10 parts of SiO2 additive according to the set ratio, mix them into a ball mill jar, add silica balls that are 1 / 2 of the total weight of raw materials, and ball mill for 2 hours;

[0038] Put the ball-milled mixed powder into a drying box and dry at 150°C for 2 hours;

[0039] Add 18% of the plasticizer of the total weight of the mixed powder into the slurry mixer and heat it to 120°C. After the plasticizer melts, take out the dried mixed powder, add it to the slurry mixer and stir at a constant speed for 30 hours, that is, the core The ingredients are prepared;

[0040] The mixed core ingredients are pressed and molded. The molding process is to hold the pressure for 20s under a pressure of 50MPa, and then demould to obtain a green body;

[0041] Embed the pressed green body sample into the calcined α-alumina filler, according to figure 1 Sintering was performed at the temperature settings shown;

...

Embodiment 2

[0045] Weigh 67 parts of quartz glass powder, 30 parts of zircon sand, and 3 parts of SiO2 additive according to the set ratio, mix them into a ball mill jar, add silica balls that are 1 / 2 of the total weight of raw materials, and ball mill for 2 hours;

[0046] Put the ball-milled mixed powder into a drying box and dry at 150°C for 2 hours;

[0047] Add 18% of the plasticizer of the total weight of the mixed powder into the slurry mixer and heat it to 120°C. After the plasticizer melts, take out the dried mixed powder, add it to the slurry mixer and stir at a constant speed for 30 hours, that is, the core The ingredients are prepared;

[0048] The mixed core ingredients are pressed and molded, and the molding process is to hold the pressure for 15s under a pressure of 60MPa, and then demould to obtain a green body;

[0049] Embed the pressed green body sample into the calcined α-alumina filler, according to figure 1 Sintering was performed at the temperature settings shown;...

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Abstract

The invention discloses a silica-based ceramic core and a preparation method thereof. The silica-based ceramic core is prepared from the following raw materials in parts by weight: 60-67 parts of silica glass powder, 30 parts of zircon sand and 3-10 parts of a SiO2 additive agent, according to a setting proportion, the raw materials are weighed, mixed and dried, and an elasticizer is added and stirred; compression moulding and demoulding of mixed slurry are conducted, a green body is obtained, and a compressed green body sample is embedded into calcination alpha-type aluminium oxide filler; and according to a set heating rate, the temperature rises for sintering, finally, the sintered sample is put into an ethyl silicate strengthening solution, after still standing, natural drying is conducted, and the core is obtained. According to the silica-based ceramic core and the preparation method thereof, sintering shrinkage of the silica-based ceramic core is low, high temperature bending strength is good, size control is good, the surface is smooth, during metal pouring, core-separating is easy, and abreuvage cannot be formed on the interfaces of metal and the core.

Description

technical field [0001] The invention relates to the field of silicon-based ceramic cores, in particular to a silicon-based ceramic core and a preparation method thereof. Background technique [0002] Modern aero-engines are developing towards a high propulsion ratio, and the most effective way to increase the thrust-to-weight ratio of the engine is to increase the temperature at the front inlet of the turbine, which puts forward higher requirements for the high-temperature resistance of the turbine blades. From the perspective of the material itself, the use of alloying to improve the temperature bearing capacity of the material is currently approaching the limit, and the difference in thermal expansion coefficient also limits the application of high-temperature protective coating materials on blades. [0003] With the development of advanced air-cooling technology, the shape of the inner cavity of the blade is becoming more and more complex. It is difficult to implement con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B41/84
CPCC04B35/14C04B41/84C04B41/009C04B41/4905C04B2235/3427C04B2235/6562C04B2235/6567C04B41/4539
Inventor 周长军郭云龙唐荣俊唐荣彪周文星
Owner 兴化市兴东铸钢有限公司
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