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Improved silica ceramic core and preparation method thereof

A technology of ceramic core and silicon oxide, which is applied in the field of ceramic core and its preparation, can solve the problems of poor high temperature performance and large firing shrinkage, achieve low high temperature deflection, improve high temperature performance, and have good metallurgical and chemical stability Effect

Inactive Publication Date: 2015-07-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of large firing shrinkage and poor high-temperature performance of existing ceramic cores, and provides an improved silicon oxide ceramic core and its preparation method

Method used

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  • Improved silica ceramic core and preparation method thereof
  • Improved silica ceramic core and preparation method thereof
  • Improved silica ceramic core and preparation method thereof

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specific Embodiment approach 1

[0017] Embodiment 1: An improved silicon oxide ceramic core of this embodiment is prepared from ceramic slurry and plasticizer; the mass ratio of the ceramic slurry to plasticizer is 100:(10~20 ); the ceramic slurry is formed by mixing 60 to 70 parts of quartz glass powder, 20 to 30 parts of zircon powder and 5 to 15 parts of corundum in parts by mass; wherein the quartz glass powder is made of 200 mesh quartz glass Powder, 300-mesh quartz glass powder and 400-mesh quartz glass powder are mixed, wherein the mass ratio of the 200-mesh quartz glass powder to the 300-mesh quartz glass powder is (4-6):3, and the 200-mesh The mass ratio of quartz glass powder to 400-mesh quartz glass powder is (2-3):1; wherein the zircon powder is mixed with 180-mesh zircon powder and 250-mesh zircon powder, and the 180-mesh zircon powder is mixed with 250-mesh zircon powder. The mass ratio of zircon powder and 250 mesh zircon powder is (2~4):1; wherein said corundum is 200 mesh corundum; said plas...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of the ceramic slurry to the plasticizer is 100:18. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the ceramic slurry is mixed by mass parts by 70 parts of quartz glass powder, 25 parts of zircon powder and 5 parts of corundum; wherein The quartz glass powder is mixed with 200-mesh quartz glass powder, 300-mesh quartz glass powder and 400-mesh quartz glass powder, wherein the mass ratio of the 200-mesh quartz glass powder to the 300-mesh quartz glass powder is 5:3 , wherein the mass ratio of 200 mesh quartz glass powder to 400 mesh quartz glass powder is 5:2; wherein the zircon powder is mixed with 180 mesh zircon powder and 250 mesh zircon powder, wherein the The mass ratio of the 180-mesh zircon powder and the 250-mesh zircon powder is 3:1. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an improved silica ceramic core and a preparation method thereof and aims to solve the problems of high firing shrinkage coefficient and poor high-temperature performance of a conventional ceramic core. The improved silica ceramic core is prepared from ceramic slurry and a plasticizer, wherein the ceramic slurry is formed by mixing quartz glass powder, zircon power and corundum in parts by mass; the plasticizer is formed by mixing paraffin, beewax and polyethylene. The method comprises preparation of the plasticizer, preparation of the ceramic slurry, preparation of a prefabrication material and preparation of the improved silica ceramic core. The high-temperature strength of the non-strengthened improved silica ceramic core is up to 18.614 MPa, is far higher than the strength of the existing silica ceramic core and is improved by 65.7%; meanwhile, the improved silica ceramic core has low high-temperature deflection, the high-temperature deflection at the temperature of 1,350 DEG C is 0 mm, and the high-temperature deflection at the temperature of 1,550 DEG C is 2.57 mm. The preparation method applies to preparation of the improved silica ceramic core.

Description

technical field [0001] The invention relates to a ceramic core and a preparation method thereof. Background technique [0002] my country's aerospace industry is developing at a high speed, and the improvement of the performance of aviation gas turbine engines is the key. To this end, the first thing is to increase the gas temperature of the turbine, which determines the real increase in the effective power of the power plant. The hollow blades made of cast superalloys with complex shapes can increase the temperature in front of the turbine, but due to the constraints of the melting point of the metal, Improving the temperature bearing performance of blades on alloy materials is currently difficult to implement. Therefore, manufacturers can only continuously improve the air-cooling structure of the blades and increase cooling efficiency to achieve the desired effect. [0003] Hollow air-cooled blade is an important technology to increase the temperature before the engine t...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622
Inventor 薛祥薛晓兰
Owner HARBIN INST OF TECH
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