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A kind of preparation method of easy-to-remove ceramic core

A ceramic core and removal technology, applied in the direction of cores, casting molding equipment, casting molds, etc., can solve the problems of difficult preparation of ceramic cores and difficult removal of ceramic cores, and achieve high strength and high density. Effect

Active Publication Date: 2011-12-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fine and complex structure ceramic core requires higher strength, which requires higher density of the core, if the density is too low and the porosity is too high, the strength will drop obviously, if the density is too high If the porosity is too low, it will bring great difficulties to the removal of the ceramic core. Therefore, it is necessary to maintain a certain porosity while maintaining the strength. This contradiction brings considerable difficulty to the preparation of the ceramic core.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 A kind of preparation method of easy-to-remove ceramic core

[0030] Place the carbon tubes of 50-80nm in xylene chemical reagent, and use ultrasonic vibration for 2 hours to uniformly disperse the carbon nanotubes in xylene for later use; melt the paraffin and add 1% polyethylene, stir continuously, and heat up to 130°C, until polyethylene is completely dissolved in paraffin, gradually add hot powder, the mass ratio of powder to plasticizer is 85:15, the powder is corundum powder and quartz powder, the mass ratio of the two is 96: 4. Stir while adding ceramic powder, while stirring, add 1.0% total mass of surfactant oleic acid at the same time, stirring for 6 hours; after the plasticizer, powder, and surfactant are mixed evenly, keep the temperature at 100 Between ℃ and 120℃, gradually add the dispersed carbon nanotubes-xylene solution, and keep stirring. After the xylene is volatilized, the carbon nanotubes are evenly distributed in the powder, and the ce...

Embodiment 2

[0031] Embodiment 2 A kind of preparation method of easy-to-remove ceramic core

[0032] Place the 50-80nm carbon tubes in cetyltrimethylammonium bromide reagent, and use ultrasonic vibration for 2 hours to uniformly disperse the carbon nanotubes in xylene for later use; melt the paraffin and add 2% poly Ethylene, stirring continuously, raised the temperature to 140°C until the polyethylene was completely dissolved in paraffin, then gradually added hot powder, the mass ratio of powder to plasticizer was 86:14, the powder was corundum powder and quartz powder, both The mass ratio is 95:5, while adding ceramic powder and stirring, while stirring, 0.5% of the total mass of surfactant oleic acid is also added, and the stirring time is 4 hours; when the plasticizer, powder, and surfactant are mixed After uniformity, keep the temperature between 100°C and 120°C, gradually add the dispersed carbon nanotube-xylene solution, and keep stirring. After the xylene is volatilized, the carbo...

Embodiment 3

[0033] Embodiment 3 A kind of preparation method of easy-to-remove ceramic core

[0034]Place the carbon tubes of 60-100nm in xylene chemical reagent, and use ultrasonic vibration for 2 hours to uniformly disperse the carbon nanotubes in xylene for later use; melt the paraffin and add 1% polyethylene, stir continuously, and heat up to 130°C, until polyethylene is completely dissolved in paraffin, gradually add hot powder, the mass ratio of powder to plasticizer is 85:15, the powder is quartz powder and corundum powder, the mass ratio of the two is 96: 4. Stir while adding ceramic powder, while stirring, add 1.0% total mass of surfactant oleic acid at the same time, stirring for 6 hours; after the plasticizer, powder, and surfactant are mixed evenly, keep the temperature at 100 Between ℃ and 120℃, gradually add the dispersed carbon nanotubes-xylene solution, and keep stirring. After the xylene is volatilized, the carbon nanotubes are evenly distributed in the powder, and the ce...

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Abstract

The invention relates to a preparation method of an easy-to-remove ceramic mold core. The easy-to-remove ceramic mold core is characterized in specific preparation method requirements that: the effective reaction area of the ceramic mold core is increased through the addition of carbon nano-tubes which takes 0.01% to 0.1% of the mass of the powder material; pores in the mold core are connected byspatial channels formed by sintered carbon nano-tubes, such that chemical liquid can be quickly delivered into the pores of the ceramic mold core, the speed of the reaction between the ceramic mold core and the chemical substances can be greatly improved, and the ceramic mold core can be quickly removed. Compared to prior arts, the ceramic mold core provided by the present invention is suitable for the producuction of high pressure hollow turbine blades with complicated inner chamber structures; the ceramic mold core material can be used for preparing ceramic mold cores with tiny and complicated structures. The prepared ceramic mold cores have relatively high strength and density. Also, certain porosity is maintained while a proper strength is maintained. Therefore, practical production requirements are ensured.

Description

Technical field: [0001] The invention relates to a method for preparing a ceramic core in the technical field of superalloys, and in particular provides a method for preparing an easy-to-remove ceramic core for producing aviation turbine blades. Background technique: [0002] In the prior art, the high-pressure turbine blade is an important part of the aero-engine. With the development of modern aviation technology, the requirement for the temperature-bearing capacity of the blade is getting higher and higher. In order to improve the temperature bearing capacity of the blades, the high temperature bearing capacity of superalloy materials has been greatly improved, but compared with the actual needs of the blades, it is far from meeting the requirements. Therefore, constantly changing the cooling structure of the blades and improving the cooling effect of the blades has become the current turbine The number one goal pursued by blade designers and manufacturers. [0003] Rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10B22C1/14
Inventor 姜卫国楼琅洪胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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