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Ceramic core with high stability and high strength

A ceramic core, high-stability technology, applied in the field of investment precision casting, can solve the problems affecting the quality, stability and strength of precision castings, improve the casting qualification rate, good high temperature stability, and improve the inner cavity. quality effect

Inactive Publication Date: 2015-03-25
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above problems, mainly to solve the technical problems of insufficient stability and strength in the prior art, which affect the product quality of precision castings, and provide a high-stability, high-strength ceramic core

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Take 60% of zirconia powder, 20% of yttrium oxide powder, and 8.5% of calcium carbonate powder, pass through a 325-mesh standard sieve respectively, take the part under the sieve, mix with 3% of nano-zirconia powder and 0.4% of oleic acid, and heat at 105°C after mixing Take 2 hours for later use, take 7.55% of paraffin wax, 0.4% of beeswax, and 0.15% of polyethylene, mix evenly at 120°C, and pass through a 325-mesh standard sieve to make a plasticizer for later use. Raise the temperature of the mixer to 120°C, add the prepared plasticizer, then add the above-mentioned mixed powder while stirring, continue stirring for 12 hours after adding all the powder, pour it out and cool it to make an ingot.

Embodiment 2

[0011] Take 69% of zirconia powder, 4% of yttrium oxide powder, and 18% of calcium carbonate powder, pass through a 325-mesh standard sieve respectively, take the part under the sieve, mix with 2% of nano-zirconia powder and 0.6% of oleic acid, and heat at 105°C after mixing Take 2 hours for later use, take 5.9% of paraffin wax, 0.3% of beeswax, and 0.2% of polyethylene, mix evenly at 120°C, and pass through a 325-mesh standard sieve to make a plasticizer for later use. Raise the temperature of the mixer to 120°C, add the prepared plasticizer, then add the above-mentioned mixed powder while stirring, continue stirring for 12 hours after adding all the powder, pour it out and cool it to make an ingot.

Embodiment 3

[0013] Take 78% of zirconia powder, 8% of yttrium oxide powder, and 6% of calcium carbonate powder, pass through a 325-mesh standard sieve respectively, take the part under the sieve, mix with 1% of nano-zirconia powder and 0.7% of oleic acid, and heat at 105°C after mixing Take 2 hours for later use, take 5.8% of paraffin wax, 0.3% of beeswax, and 0.2% of polyethylene, mix evenly at 120°C, and pass through a 325-mesh standard sieve to make a plasticizer for later use. Raise the temperature of the mixer to 120°C, add the prepared plasticizer, then add the above-mentioned mixed powder while stirring, continue stirring for 12 hours after adding all the powder, pour it out and cool it to make an ingot.

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Abstract

A ceramic core with high stability and high strength is provided to mainly overcome the technical problem that the stability and strength of ceramic cores in the prior art is not high enough, which affects the product quality of investment castings. The raw materials of the ceramic core comprise, by weight, 60-85% of zirconia powder, 4-20% of yttria powder, 2-18% of calcium carbonate powder, 0.5-3% of nanometer zirconia powder, 4-8% of paraffin, 0.2-0.6% of beeswax, 0.1-0.3% of polyethylene, and 0.4-0.8% of oleic acid. According to the invention, the ceramic core possesses good high-temperature stability and enough strength, so that the inner cavity quality of investment castings is significantly improved and the core fracture phenomenon resulting from low strength can be avoided during precision casting, which helps substantial increase in the casting qualified rate. By adopting the material system in the invention, the reaction between a fusion metal and a core material, which results in a responsive defect, can be avoided during the high temperature cast. The ceramic core is mainly applied to the field of investment casting.

Description

technical field [0001] The invention relates to a high-stability, high-strength ceramic core, which is mainly used in the field of investment precision casting. Background technique [0002] The ceramic core is an adapter that forms the complex hollow cavity structure of the precision casting. The surface quality and dimensional accuracy of the cavity of the precision casting are completely determined by the ceramic core. Therefore, the ceramic core material is required to have good high temperature stability to ensure During the casting process, there cannot be any reaction with the molten metal liquid; in addition, during use, the ceramic core needs to withstand the impact of the wax liquid during wax pressing and the high-temperature molten metal liquid during casting, so it needs to have sufficient strength. The existing ceramic cores are mainly made of silicon dioxide, whose stability and strength cannot meet the needs of actual production. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 许壮志程涛韩绍娟李建华张立健
Owner LIAONING SILICATE RES INST
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