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Preparation method of lanthanum oxide-based ceramic core

A technology of ceramic core and lanthanum oxide, which is applied in the direction of cores, casting molding equipment, casting molds, etc., can solve the problems of difficult core removal, poor solubility, restrictions on use and development, etc., achieve high strength and reduce removal time , Conducive to the effect of large-scale production

Active Publication Date: 2016-06-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alumina is a neutral oxide with stable chemical properties, poor solubility in lye, and very difficult core removal, which in turn restricts the further use and development of alumina-based ceramic cores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix the base lanthanum oxide powder with the additive silicon oxide powder by ball milling, the amount of silicon oxide added is 10wt% (relative to the total mass of the powder mixture), the ball-to-material ratio is 2:1, and the ball mill is 24 hours. After drying for 24 hours, after the paraffin wax was melted at 90°C, gradually add the obtained ceramic powder mixture, and mechanically stir for 24 hours to obtain a lanthanum oxide-based composite ceramic slurry; use the injection molding method to maintain the lanthanum oxide-based ceramic slurry at 90°C, The injection pressure is 15Mpa, the holding time is 60s, and the lanthanum oxide-based ceramic core of the desired shape is obtained; the lanthanum oxide-based ceramic core is placed in the industrial lanthanum oxide filler in the sagger, and then the sagger is placed in the box-type resistor Carry out sintering in a furnace with a final firing temperature of 1500°C and a holding time of 10 hours. Cool with the furna...

Embodiment 2

[0018] Mix the base lanthanum oxide powder with the additive alumina powder by ball milling, the amount of alumina added is 15wt% (relative to the total mass of the powder mixture), the ball-to-material ratio is 2:1, and the ball mill is 24 hours. After drying for 24 hours, after the paraffin wax was melted at 90°C, gradually add the obtained ceramic powder mixture, and mechanically stir for 24 hours to obtain a lanthanum oxide-based composite ceramic slurry; use the injection molding method to maintain the lanthanum oxide-based ceramic slurry at 90°C, The injection pressure is 15Mpa, the holding time is 60s, and the lanthanum oxide-based ceramic core of the desired shape is obtained; the lanthanum oxide-based ceramic core is placed in the industrial lanthanum oxide filler in the sagger, and then the sagger is placed in the box-type resistor Carry out sintering in a furnace with a final firing temperature of 1500°C and a holding time of 10 hours. Cool with the furnace to obtain...

Embodiment 3

[0020] Mix the base lanthanum oxide powder with the additive magnesium oxide powder by ball milling, the amount of magnesium oxide added is 10wt% (relative to the total mass of the powder mixture), the ball-to-material ratio is 2:1, ball milling for 24 hours, after mixing, at 120°C After drying for 24 hours, after the paraffin wax was melted at 90°C, gradually add the obtained ceramic powder mixture, and mechanically stir for 24 hours to obtain a lanthanum oxide-based composite ceramic slurry; use the injection molding method to maintain the lanthanum oxide-based ceramic slurry at 90°C, The injection pressure is 15Mpa, the holding time is 60s, and the lanthanum oxide-based ceramic core of the desired shape is obtained; the lanthanum oxide-based ceramic core is placed in the industrial lanthanum oxide filler in the sagger, and then the sagger is placed in the box-type resistor Carry out sintering in a furnace with a final firing temperature of 1550°C and a holding time of 10 hou...

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Abstract

The invention relates to a preparation method of a lanthanum oxide-based ceramic core. The method comprises the following steps: ball milling and mixing are carried out for lanthanum oxide powder and additive powder, after paraffin melts, the mixed powder is gradually added, mechanical stirring is carried out, and composite ceramic core slurry is obtained; an injection moulding method is used for preparing the lanthanum oxide-based ceramic core of a required shape; a powder embedded sintering process is used for sintering the lanthanum oxide-based ceramic core, and the required ceramic core is obtained; finally, the required lanthanum oxide-based ceramic core is packaged with vacuum or inert atmosphere protection in order to be isolated from air till usage. The preparation technology and method of the lanthanum oxide-based ceramic core is simple and has good operationality; the lanthanum oxide-based ceramic core has high strength and high yield, and can be used with a higher casting temperature; the core is easy to remove during the removing phase of the core, so that efficiency is improved, and production cost is reduced.

Description

technical field [0001] The invention relates to the development and preparation method of a ceramic core used in the high-temperature alloy technical field, and in particular provides a preparation method of a lanthanum oxide-based ceramic core. Background technique [0002] With the development of the modern aviation industry, aero-engines need to adopt a more advanced cooling system, which has higher requirements for the temperature bearing capacity of the turbine blades. At present, there are mainly two ways to improve the temperature bearing capacity of turbine blades. One is to increase the temperature bearing capacity of the superalloy itself, and the other is to use blade cooling technology to reduce the temperature of the blades. In recent years, great achievements have been made in improving the temperature bearing capacity by changing the superalloy itself, but compared with the needs and performance requirements of the blade, this is far from enough. Therefore, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622B22C9/10B22C1/00
CPCB22C1/00B22C9/10C04B35/50C04B35/622C04B2235/3206C04B2235/3217C04B2235/3225C04B2235/3418C04B2235/6022
Inventor 余建波杨治刚任忠鸣王欢李景云邓康
Owner SHANGHAI UNIV
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