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Soluble ceramic core for metal casting

A metal casting and ceramic core technology, which is applied in casting equipment, metal processing equipment, casting molten material containers, etc., can solve the problem that the strength of high-purity quartz glass powder ceramic core cannot meet the use requirements and cannot meet the complex cavity of metal castings Forming requirements, difficult to obtain casting cavity and other problems, to achieve the effect of low price, improved adaptability, and convenient strength

Inactive Publication Date: 2006-05-17
朱晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Some metal devices with cavities need cavity cores during casting. Traditional ceramic cores for metal casting are mostly insoluble. Generally, alumina materials are used to make ceramic cores. When in use, only mechanical The method of physically crushing the ceramic core in the casting after forming, so as to obtain the cavity inside the casting
This method has great limitations, because it is difficult to obtain complex and special-shaped cavities inside castings, and only linear cavities can be cleaned during cleaning, so it cannot meet the forming requirements of complex cavities inside metal castings
Another more advanced method is to use a soluble ceramic core. The soluble ceramic core can be removed after being dissolved in a sodium hydroxide alkali solution or a high-temperature solution of sodium hydroxide above 300°C. All ceramic cores use high-grade high-purity quartz glass powder as raw materials, and the manufacturing cost is extremely expensive. It can only be used for a small number of precision metal castings, such as some aircraft parts, and it is difficult to popularize. And this kind of high-purity quartz glass powder ceramics The dissolution requirements of the core are relatively high. The dissolution time is relatively long when molten lye or high-concentration high-temperature lye is used, or even strongly corrosive hydrofluoric acid. The strength of the high-purity quartz glass powder ceramic core is sometimes not enough. Meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The soluble ceramic mold core for metal casting of the present invention, raw material batching weight percent is composed of:

[0020] Composite powder 85%, silica powder 5%, CMC 10%;

[0021] The compound powder is made by mixing 85% quartz sand and 15% quartz glass.

[0022] Mix the composite material powder evenly and pass through a 100-mesh sieve, take the sieve material, mix it with silicon micropowder and CMC, mix it with 10% wax liquid by weight of the molding material, mix it evenly, put it into the mold and press it to form a core, and demould Afterwards, it is fired at a temperature of 1300±10° C., and naturally cooled to obtain the ceramic core product of the present invention.

[0023] Boil 35% industrial soda ash solution, put the ceramic core in it and cook for 40 minutes, and the core will dissolve.

Embodiment 2

[0025] The soluble ceramic mold core for metal casting of the present invention, raw material batching weight percent is composed of:

[0026] Composite powder 81%, silica powder 8%, CMC 11%;

[0027] The compound powder is made by mixing 85% quartz sand and 15% quartz glass.

[0028] Mix the composite material powder evenly and pass through a 100-mesh sieve, take the sieve material and mix it with silicon micropowder and CMC evenly, mix it with wax liquid with 11% weight of the molding material, mix it evenly, put it into the mold and press it to form a core, and demould Afterwards, it is fired at a temperature of 1200±10° C., and naturally cooled to obtain the ceramic core product of the present invention.

[0029] Boil 35% industrial soda ash solution, put the ceramic core in it and cook for 35 minutes, and the core will dissolve.

Embodiment 3

[0031] The soluble ceramic mold core for metal casting of the present invention, raw material batching weight percent is composed of:

[0032] Composite powder 88%, silica powder 5%, CMC 7%;

[0033] The compound powder is made by mixing 88% quartz sand and 12% quartz glass.

[0034] Mix the composite material powder evenly and pass through a 120-mesh sieve, take the sieve material, mix it with silicon micropowder and CMC, mix it with 10% wax liquid by weight of the molding material, mix it evenly, put it into the mold and press it to form a core, and demould Afterwards, it is fired at a temperature of 1400±10° C., and naturally cooled to obtain the ceramic core product of the present invention.

[0035] Boil 35% industrial soda ash solution, put the ceramic core in it and cook for 40 minutes, and the core will dissolve.

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Abstract

The present invention is soluble ceramic core for casting of metal cavity, and the soluble ceramic core is made through compounding material, forming and sintering. The material for the soluble ceramic core consists of composite material powder 80-90 wt%, fine silica powder 1-10 wt% and CMC 5-15 wt%, and the composite material powder consists of quartzite in 70-99 wt% and quartz glass in 1-30 wt% mixed together. The soluble ceramic core has low cost and may be leached out from metal casting through setting the casting inside boiling industrial sodium carbonate solution for 0.5-1 hr or setting the casting inside molten alkali for 10-30 min. In addition, the ceramic core has easily regulated strength.

Description

technical field [0001] The invention relates to a soluble ceramic mold core for metal casting, which is used for casting molding of metal device cavities. Background technique [0002] Some metal devices with cavities need cavity cores during casting. Traditional ceramic cores for metal casting are mostly insoluble. Generally, alumina materials are used to make ceramic cores. When in use, only mechanical The method physically breaks the ceramic core in the formed casting to obtain the cavity inside the casting. This method has great limitations, because it is difficult to obtain complex and special-shaped cavities inside the casting, and only linear cavities can be cleaned during cleaning, so it cannot meet the forming requirements of complex cavities inside metal castings. Another more advanced method is to use a soluble ceramic core. The soluble ceramic core can be removed after being dissolved in a sodium hydroxide alkali solution or a high-temperature solution of sodium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/44
Inventor 杨实朱晓林
Owner 朱晓林
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