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Gradient hollow ceramic core and preparation method thereof

A hollow ceramic and ceramic core technology, applied in the field of precision casting, can solve the problems of long removal time and low core removal efficiency, and achieve the effects of low cost, easy promotion, and improved bending strength and toughness

Active Publication Date: 2021-01-19
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a gradient hollow ceramic core, which solves the problems of long removal time and low removal efficiency of the ceramic core in the prior art

Method used

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  • Gradient hollow ceramic core and preparation method thereof

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preparation example Construction

[0027] The preparation method of the gradient hollow ceramic core of the present invention is implemented according to the following steps:

[0028] Preparatory steps: Weigh the following components according to mass percentage: fused quartz 65%-75%; zircon 10-30%; white paraffin 5-30%; diethyl phthalate 0.5-5%; beeswax 0.5- 5%; polyethylene 0.05-1%; oleic acid 0.05-1%; 5-10% high temperature resistant silica sol, totaling 100%; separate 10% from the total amount of fused quartz to prepare square fused quartz, separate 10% % prepare refractory materials, and the remaining 80% fused silica is used to prepare fused silica powder;

[0029] Step 1: Preparation of thermoplastic ceramic slurry

[0030] 1.1) Put white paraffin, diethyl phthalate, beeswax, and polyethylene into a blender, heat up to 50-200°C, and make a wax core after it is completely melted; the wax core is used to put the inner layer of the ceramic core middle.

[0031] 1.2) Take fused silica powder, zircon powde...

Embodiment 1

[0038] Preliminary step: weigh the following components according to mass percentage: fused silica 65%; white paraffin 12%; diethyl phthalate 2%; beeswax 2%; polyethylene 1%; zircon 17%; oleic acid 1 %; Total 100%. Separate 10% from the total amount of fused quartz to prepare square fused quartz, separate 10% to prepare refractory materials, and the remaining 80% fused quartz is used to prepare fused quartz powder;

[0039] Step 1: Preparation of thermoplastic ceramic slurry

[0040]1.1) Put white paraffin, diethyl phthalate, beeswax, and polyethylene into a blender, heat up to 120°C, and make wax cores after they are completely melted;

[0041] 1.2) Take fused silica powder, zircon powder and cubic fused quartz with different particle sizes, put the three raw materials into the ball mill pot in turn, add zirconia balls with a diameter of 10mm, and the three raw materials are mixed with zirconia The mass ratio of the pellets is 3:2. After full ball milling at room temperatur...

Embodiment 2

[0047] Preliminary steps: weigh the following components according to mass percentage: fused quartz 67%; white paraffin 13%; diethyl phthalate 2%; beeswax 2%; polyethylene 0.05%; zircon 18%; oleic acid 0.05% %; Total 100%. Separate 10% from the total amount of fused quartz to prepare square fused quartz, separate 10% to prepare refractory materials, and the remaining 80% fused quartz is used to prepare fused quartz powder;

[0048] Step 1: Preparation of thermoplastic ceramic slurry

[0049] 1.2) Put white paraffin, diethyl phthalate, beeswax, and polyethylene into a blender, heat up to 60°C, and make wax cores after they are completely melted;

[0050] 1.2) Take fused silica powder, zircon powder and square fused quartz with different particle sizes, put the three raw materials into the ball mill pot in turn, add zirconia pellets with a diameter of 5mm, and the three raw materials are mixed with zirconia The mass ratio of the pellets is 3:2. After fully ball milling at room...

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Abstract

The invention discloses a gradient hollow ceramic core, which is composed of the following components in percentage by mass: 65-75% of fused quartz; 10%-30% of zircon; 5%-30% of white paraffin; 0.5%-5% of diethyl phthalate; 0.5%-5% of bee wax; 0.05%-1% of polyethylene; 0.05%-1% of oleic acid; and 5%-10% of high-temperature-resistant silica sol, and the total percentage by mass is 100%. The invention also discloses a preparation method of the gradient hollow ceramic core. The preparation method comprises the following steps: weighing the components in percentage by mass in advance; step 1, preparing thermoplastic ceramic slurry; step 2, carrying out hot-press injection to obtain a molded ceramic core blank; and step 3, sintering, heating, curing and molding. According to the method, the problems of long removal time and low core removal efficiency of a ceramic core are solved, the cost is low, the preparation process is simple, and the method is convenient to popularize.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and relates to a gradient hollow ceramic core, and also relates to a preparation method of the gradient hollow ceramic core. Background technique [0002] With the rapid development of aviation, aerospace and industrial gas turbine technology, the gas temperature of the turbine engine continues to increase, so it is required to continuously increase the high temperature resistance of the turbine blades. In view of this, the structure of superalloy turbine blades has gradually changed from solid to hollow to adapt to the application of air cooling technology. Investment casting superalloys is one of the main technologies for manufacturing hollow turbine blades, and the premise of this technology is to prepare ceramic cores and shells with good performance. [0003] At present, in the manufacture of high-temperature turbine blades, relatively expensive high-temperature alloys are general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/14C04B35/622C04B35/63C04B35/64
CPCC04B38/067C04B38/0645C04B35/14C04B35/622C04B35/6316C04B35/64C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6022
Inventor 屈银虎王钰凡高浩斐张红何炫张学硕
Owner XI'AN POLYTECHNIC UNIVERSITY
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