Improved alumina ceramic core and preparation method thereof

A technology of alumina ceramics and cores, which is applied in the field of ceramic cores and their preparation, can solve the problems of difficult core removal, low firing porosity, and low strength at room temperature, etc., and achieve improved core removal efficiency, preparation process and Ease of operation and the effect of improving the molding rate

Inactive Publication Date: 2015-07-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of low firing porosity, low strength at room temperature, large shrinkage rate, large deflection at high temperature, difficulty in removing the core, ina

Method used

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  • Improved alumina ceramic core and preparation method thereof
  • Improved alumina ceramic core and preparation method thereof
  • Improved alumina ceramic core and preparation method thereof

Examples

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specific Embodiment approach 1

[0029] Embodiment 1: An improved alumina ceramic core in this embodiment is prepared from ceramic slurry and plasticizer;

[0030] The mass ratio of the ceramic slurry to the plasticizer is 100: (20-30); the ceramic slurry consists of 5-90 parts by mass of corundum powder, 5-90 parts of mullite, 7-35 parts by mass. It is made by mixing 1-1.5 parts of quartz powder, 1-1.5 parts of active graphite, 1-1.5 parts of magnesium oxide and 0.5-1 part of oleic acid;

[0031] The corundum powder described therein is mixed by 200 mesh corundum powder, 300 mesh corundum powder and 400 mesh corundum powder, wherein the mass ratio of 200 mesh corundum powder to 300 mesh corundum powder is (3~7):3, The mass ratio of the 200-mesh corundum powder to the 400-mesh corundum powder is (3-7): 2;

[0032] The mullite powder described therein is mixed by 200 mesh mullite powder, 320 mesh mullite powder and 400 mesh mullite powder; wherein the mass ratio of the 200 mesh mullite powder to the 320 mesh ...

specific Embodiment approach 2

[0038] Embodiment 2: This embodiment differs from Embodiment 1 in that: the mass ratio of the ceramic slurry to the plasticizer is 100:25. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that the ceramic slurry consists of 65-80 parts by mass of corundum powder, 10-20 parts of mullite powder, and 10-20 parts of quartz powder, 1 part of activated graphite, 1.5 parts of magnesium oxide and 0.5 part of oleic acid. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses an improved alumina ceramic core and a preparation method thereof and aims to solve the problems that an existing ceramic core has low firing porosity, low room temperature strength, high shrinkage cofficient, high high-temperature deflection and difficulty in core stripping and cannot be used in a high-temperature environment and later core stripping is difficult. The improved alumina ceramic core is prepared from ceramic slurry and a plasticizer, wherein the ceramic slurry is formed by mixing corundum powder, mullite, quartz powder, activated graphite, magnesium oxide and oleic acid; the plasticizer is formed by mixing paraffin, beewax and polyethylene. The method comprises preparation of the plasticizer, preparation of the ceramic slurry, preparation of a prefabrication material and preparation of the improved alumina ceramic core. The firing shrinkage coefficient of the non-strengthened improved silica ceramic core is 0.58% and is reduced by 2.52%; meanwhile, the high-temperature deflection of the improved alumina ceramic core after high-temperature reinforcement is 0.23 mm and reduced by 6.77 mm.

Description

technical field [0001] The invention relates to a ceramic core and a preparation method thereof. Background technique [0002] Aircraft is one of the great scientific and technological achievements of mankind in the 20th century, which has greatly promoted the progress of human civilization. As the "heart" of the aircraft, the engine is the source of power to promote the vigorous development of the aircraft and the entire aviation industry. In an aero-engine, since the turbine blades are located at high temperature, complex stress, and extremely harsh environment for a long time, the performance of the turbine blades is directly related to the performance index of the entire engine. The performance level of turbine blades (especially the temperature bearing capacity) is not only an important indicator of the advanced level of a type of engine, but also a significant indicator of the level of a country's aviation industry. Many countries in the world are already carrying ou...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 薛祥尹逊同
Owner HARBIN INST OF TECH
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