Silicon-based ceramic core with cold and hot impact resistance, high-temperature creep resistance and easy removal performance and preparation process thereof

A technology of anti-cold and thermal shock, ceramic core, used in cores, manufacturing tools, casting and molding equipment, etc., can solve the problem of difficulty in ensuring the uniformity of cristobalite, and achieve excellent easy removal performance, high strength and chemical stability The effect of high temperature and high temperature creep resistance

Active Publication Date: 2021-01-15
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

When the silicon-based ceramic core is sintered, the amount of cristobalite precipitation must be controlled to ensure that the ceramic core ha

Method used

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  • Silicon-based ceramic core with cold and hot impact resistance, high-temperature creep resistance and easy removal performance and preparation process thereof
  • Silicon-based ceramic core with cold and hot impact resistance, high-temperature creep resistance and easy removal performance and preparation process thereof

Examples

Experimental program
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Example Embodiment

[0034]The preparation process of the ceramic core is as follows:

[0035](1) Put the quartz glass, alumina and cristobalite into the pot mill according to the ratio, and mill the pot at 80r / min for 24 hours, and the obtained powder will be used for later use;

[0036](2) Heat the plasticizer to 85°C, wait until it is completely melted, add the powder obtained in step (1) into the plasticizer in 4 batches, each batch accounts for 25% of the total powder, the adding process continues Stir to ensure that there is no dry powder. After all the powders are added, a slurry is obtained. The ceramic powder accounts for 82% of the slurry and the plasticizer accounts for 18%. The composition of the plasticizer is (wt.%): 86% paraffin wax, 3% stearic acid, and 11% PVC. Pour the obtained slurry into a slurry ingot for storage;

[0037](3) Heat the slurry ingot prepared in step (2) to 90-110° C., hold for 12-24 hours, and prepare ceramic core green after the slurry ingot is completely melted;

[0038](4) Sel...

Example Embodiment

[0039]Example 1

[0040]Ceramic core composition: quartz glass (100 mesh to 200 mesh): 76%, cristobalite (1000 mesh to 3000 mesh): 4%, alumina (600 mesh to 1000 mesh): 20%; the quartz glass, square The purity of quartz and alumina are both 99.9%; after adding plasticizer, they are pressed into a plate-shaped ceramic core blank with a size of 12cm*1cm*0.4cm;

[0041]Alumina powder with a purity of ≥99.9% and a particle size of 150-200 mesh is selected as the filler, the ceramic core blank is embedded in the filler powder, and the temperature is raised to 500°C at a heating rate of 5°C / min and kept for 5 hours, and then at 15°C The temperature rise rate per minute is raised to 1220℃ and kept for 2h. The sintered ceramic core is analyzed by X-ray pattern, and the relative content of cristobalite in the ceramic core is calculated to be about 10%. The ceramic core is heated to 1550℃. , Heat preservation for 1 hour, at this time the high temperature creep performance of the ceramic core is meas...

Example Embodiment

[0044]Example 2

[0045]Ceramic core composition: quartz glass (100 mesh to 200 mesh): 74%, cristobalite (1000 mesh to 3000 mesh): 6%, alumina (600 mesh to 1000 mesh): 20%; the quartz glass, square The purity of quartz and alumina are both 99.9%; after adding plasticizer, they are pressed into a plate-shaped ceramic core blank with a size of 12cm*1cm*0.4cm;

[0046]Alumina powder with a purity of ≥99.9% and a particle size of 150-200 mesh is selected as the filler, the ceramic core blank is embedded in the filler powder, and the temperature is raised to 500°C at a heating rate of 5°C / min and kept for 5 hours, and then at 15°C The temperature rise rate per minute is raised to 1220℃ and kept for 2h. After sintering the ceramic core, by analyzing the X-ray pattern, it is calculated that the relative content of cristobalite in the ceramic core is about 15%, and the ceramic core is heated to 1550℃. ,Heat for 1 hour, at this time the high temperature creep performance of the ceramic core is mea...

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Abstract

The invention discloses a silicon-based ceramic core with cold and hot impact resistance, high-temperature creep resistance and easy removal performance and a preparation process thereof, and belongsto the technical field of high-temperature alloys. Quartz glass powder with a certain particle size is used for forming a ceramic core matrix framework, so that it is ensured that the ceramic core hasgood cold and hot impact resistance; the sintering density of the ceramic core is improved by crystal cristobalite and alumina powder with the particle size of micron or below, so that the high-temperature creep resistance is improved; and in the directional solidification process, the cristobalite is used as a seed crystal, so that large-particle quartz glass is easy to crystallize, cracks are formed in the cooling process, it is easy for an alkali liquor to infiltrate into the cracks when the core is removed, and the removal performance of the ceramic core is improved.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloys, and in particular provides a silicon-based ceramic core for large-size single crystal / directional hollow guide vanes that is resistant to cold and heat shock, high temperature creep and easy to remove, and a preparation process thereof. Background technique [0002] Single crystal / directional turbine blades are the most critical hot-end components of gas turbines. With the development of gas turbines, the power and thermal efficiency continue to increase, and the requirements for the temperature bearing capacity of turbine blades are also getting higher and higher. In order to improve the temperature bearing capacity, the cooling structure of the blade is becoming more and more complicated, and the difficulty of its preparation is obviously increased or decreased. [0003] Single crystal / directional turbine blade cooling cavity structures are typically formed using ceramic cores....

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/00
CPCB22C1/00B22C9/10
Inventor 李凯文姜卫国肖久寒董加胜楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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