Method for improving high-temperature performance of alumina-base ceramic core

A high-temperature performance, base ceramic technology, applied in the field of precision casting, to achieve the effect of good de-cored manufacturability

Inactive Publication Date: 2011-01-26
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, this is a pair of contradictions that need to be coordinated and unified

Method used

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Embodiment Construction

[0019] (1) Preparation of alumina-based ceramic core body

[0020] Dissolve acrylamide monomer and N,N'-methylenebisacrylamide in an appropriate amount of deionized water at a mass ratio of 24:1 to prepare a premixed solution with a mass fraction of 25%, and adjust the pH of the premixed solution with concentrated ammonia water The value is adjusted to 11, the mass fraction is 30% sodium polyacrylate solution (addition amount 3.0wt%, taking the solid powder mass as a reference) into the premixed solution, and then add coarse and fine fused corundum powders in batches (d 50 =25μm and 5μm) and yttrium oxide powder, magnesium oxide powder (d 50 Both are 2 μm); its mass percentage is: 75% of coarse-grained fused corundum, 15% of fine-grained fused corundum, 6% of yttrium oxide micropowder, and 4% of magnesium oxide micropowder). Stir while adding, and finally use a ball mill for 3 hours to obtain a low-viscosity (0.875Pa.S) high-solid phase (55vol%) water-based ceramic slurry.

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PUM

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Abstract

The invention discloses a method for improving the high-temperature performance of an alumina-base ceramic core, which comprises the following steps of: firstly, preparing an alumina-base ceramic core blank by adopting a gel casting molding process; secondly, preparing an alumina-base ceramic core prefabricated body with a plurality of holes and certain room-temperature anti-bending strength by freezing, drying and pre-sintering; thirdly, allowing penetrating fluid to seep into the alumina-base ceramic core prefabricated body under the conditions of vacuum and external pressure, drying, removing gel and soaking under vacuum and at pressure for three times; and finally, sintering at a high temperature to obtain the required alumina-base ceramic core. The alumina-base ceramic core prepared by the invention has high high-temperature performance and high core-removing property, can meet the process requirements of a hollow turbine blade on directional casting and single-crystal casting and guarantees the qualification rate of blade castings.

Description

technical field [0001] The invention relates to a method for improving the high-temperature performance of an alumina-based ceramic core, which is mainly used in the field of precision casting. Background technique [0002] In the hollow turbine blade precision casting process, ceramic cores are used to form the complex cooling channels inside the blade. At present, there are mainly two types of ceramic cores for blades: silica-based ceramic cores and alumina-based ceramic cores. The silica-based ceramic core relies on controlling the amount of cristobalite to improve its high-temperature performance. When the operating temperature is higher than 1550°C and is used for single crystal casting, the qualified rate of the blade will be affected, especially the alloy containing Al, Hf and C When the temperature is higher than 1550°C, the silicon oxide-based core will chemically react with it. Therefore, the silicon oxide-based ceramic core is only suitable for producing columnar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 李涤尘吴海华邢建东徐东阳陈晓杰左艳峰
Owner XI AN JIAOTONG UNIV
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