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Silicon carbide reinforced silicon-based ceramic core and preparation method thereof

A technology of ceramic cores and silicon carbide, which is applied in the direction of cores, casting molding equipment, casting molds, etc., can solve the problems of short life at high temperature, long core removal cycle, product waste, etc., to improve the efficiency of core removal and improve the efficiency of core removal. Efficiency, pollution reduction effect

Active Publication Date: 2020-09-11
SHENYANG MINGHE QUARTZ PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can greatly avoid the long stripping cycle caused by thick and complex sizes, and the problems of broken cores and short service life at high temperature caused by poor stripping strength of thinner complex sizes, and further avoids the product waste caused by broken cores in the metal casting process

Method used

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  • Silicon carbide reinforced silicon-based ceramic core and preparation method thereof
  • Silicon carbide reinforced silicon-based ceramic core and preparation method thereof
  • Silicon carbide reinforced silicon-based ceramic core and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A silicon carbide reinforced ceramic core, including raw materials: silicon carbide, silicon carbide whiskers, metal powder, silicon oxide and binder; wherein:

[0062] The silicon carbide powder has a purity of more than 99%, a D50 particle size of 325 μm, 8% by mass, 32% by 180 μm, 30% by 40 μm, and 30% by mass of 18 μm;

[0063] The silicon carbide whiskers have an average particle size of 100nm and a specific surface area of ​​30m 2 / g, the added mass is 10% of the silicon carbide powder;

[0064] The particle size of the silicon oxide powder is 70 μm, and the added mass is 32% of the silicon carbide powder;

[0065] The added mass of the metal yttrium powder is 0.7% of the silicon carbide powder;

[0066] The binder is a mixture of liquid paraffin and paraffin at a ratio of 1:1.5, and the added mass is 14% of the mass sum of the above materials;

[0067] The preparation method of the silicon carbide reinforced silicon-based ceramic core comprises the following s...

Embodiment 2

[0077] A silicon carbide reinforced ceramic core, including raw materials: silicon carbide, silicon carbide whiskers, metal powder, silicon oxide and binder;

[0078] The silicon carbide powder has a purity of more than 99%, a D50 particle size of 425 μm, 4% by mass, 30% by 180 μm, 40% by 61 μm, and 26% by mass of 23 μm;

[0079] The silicon carbide whiskers have an average particle size of 100nm and a specific surface area of ​​30m 2 / g, the added mass is 18% of silicon carbide powder

[0080] The particle size of the silicon oxide powder is 80 μm, and the added mass is 50% of the silicon carbide powder;

[0081] The added mass of the metal yttrium powder is 0.8% of the silicon carbide powder;

[0082] The added mass of the binder is 25% of the total mass of the above materials.

[0083] The preparation method of the silicon carbide reinforced silicon-based ceramic core comprises the following steps:

[0084] (1) prepare materials according to the raw material ratio of si...

Embodiment 3

[0094] A silicon carbide reinforced ceramic core, including raw materials: silicon carbide, silicon carbide whiskers, metal powder, silicon oxide and binder;

[0095] The silicon carbide powder has a purity of more than 99%, a D50 particle size of 550 μm, 5% by mass, 35% by 150 μm, 35% by 70 μm, and 25% by mass of 18 μm;

[0096] The silicon carbide whiskers have an average particle size of 100nm and a specific surface area of ​​30m 2 / g, the added mass is 12% of the silicon carbide powder;

[0097] The particle size of the silicon oxide powder is 75 μm, and the added mass is 35% of the silicon carbide powder;

[0098] The added mass of the metal yttrium powder is 0.6% of the silicon carbide powder;

[0099] The added mass of the binder is 16% of the sum of the mass of the above materials.

[0100] The preparation method of the silicon carbide reinforced silicon-based ceramic core comprises the following steps:

[0101] (1) prepare materials according to the raw material r...

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Abstract

The invention discloses a silicon carbide reinforced silicon-based ceramic core and a preparation method thereof. The ceramic core comprises the following raw materials of silicon carbide, a silicon carbide whisker, silicon oxide, metal yttrium powder and a binder, wherein adding mass of the silicon carbide whisker accounts for 10%-18% of that of silicon carbide powder, adding mass of the siliconoxide accounts for 30%-50% of that of the silicon carbide powder, adding mass of the metal yttrium powder accounts for 0.1%-0.8% of that of the silicon carbide powder, and adding mass of the binder accounts for 10%-25% of total mass of the materials described above. The preparation method comprises the following steps that firstly, dry powder is mixed, then the uniformly-mixed powder is graduallyadded into a molten binder, compression molding is conducted, sintering is conducted in a shuttle kiln of an oxygen atmosphere, a final sintering temperature is 1350-1650 DEG C, and the reinforced ceramic core is obtained after molding. According to the ceramic core, the silicon carbide is compounded, an anti-breaking layer has a large amount of spherical morphology, the strength of the product isobviously improved, the ceramic core has excellent physical properties, and can improve the high temperature resistance, impact resistance and the like of the product, and the working time of the ceramic core at 1450 DEG C or above is prolonged.

Description

Technical field: [0001] The invention belongs to the technical field of precision casting-ceramic core, and in particular relates to a silicon carbide reinforced silicon-based ceramic core and a preparation method thereof. Background technique: [0002] With the continuous development of cooling technology, the shape of blade cavity is becoming more and more complex, which must be formed in investment casting with ceramic core. Therefore, the technical development of ceramic core directly affects the level of hollow blades. It has always been the bottleneck in the development and casting of hollow blades, and determines the dimensional accuracy, pass rate and production cost of cast blades. Therefore, it is very important to continuously improve the ceramic core material and manufacturing technology. [0003] Silicon-based ceramic cores have the advantages of small thermal expansion coefficient, excellent thermal stability, high mechanical strength, good chemical stability ...

Claims

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Application Information

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IPC IPC(8): B22C9/10C22C49/02C22C49/14C22C47/14C22C101/14
CPCB22C9/10C22C47/14C22C49/02C22C49/14
Inventor 梁康硕刘枫
Owner SHENYANG MINGHE QUARTZ PROD
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