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Water-soluble ceramic core for superalloy single crystal blade and preparation method thereof

A single crystal blade and ceramic core technology, which is applied in the field of high-temperature alloy single crystal blade water-soluble ceramic core and its preparation, can solve problems such as unsatisfactory core removal speed, difficulty in core removal from aluminum-based ceramic cores, and obstacles to wide application. , to achieve the effect of increasing the driving force of solid phase sintering, high strength and easy removal

Inactive Publication Date: 2016-01-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] and A1 2 0 3 The base ceramic core hardly reacts with concentrated acid and alkali under normal temperature and heating conditions, it is difficult to remove, and its core removal speed cannot meet the needs of industrial production, so improving the core removal speed is the key to its application; The key technology of the base ceramic core is the core removal problem. It is very difficult to remove the core of the aluminum base ceramic core. Salt compound as the medium, the principle is: A1 2 o 3 +F - →AlF 6 -3 , this kind of core removal method sometimes needs to be supplemented by high-pressure water washing; the second is to use lye as a medium and wash it with high-pressure water

Method used

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  • Water-soluble ceramic core for superalloy single crystal blade and preparation method thereof

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Effect test

Embodiment 1

[0037] Example 1 : batching is composed of 85% fused corundum powder, 7% quartz powder, 3% sodium phosphate, 2% sodium aluminate, 3% MgO powder; add 3% polyethylene glycol and 10% water; process according to the above In the molding step, the wet core is prepared by mixing the materials, and then the wet core is put into the roasting furnace, heated with the furnace to a temperature of 300°C, heated and dried at 300°C for 1 hour; Heat to 1500°C, and heat at this temperature for 30 minutes; when the temperature in the furnace is cooled to 110°C, then cool to room temperature and take out the core, put the core into 40% NaOH aqueous solution, and most of it will be dissolved within 2 hours , It can be fully dissolved after stirring; take some other cores and cool them to room temperature. After testing, the tensile strength at room temperature is 6.8Mpa, and the bending strength at room temperature is 24.4Mpa.

Embodiment 2

[0038] Example 2 Batching is composed of 88% fused corundum powder, 3% quartz powder, 3% sodium phosphate, 2% sodium aluminate, 4%MgO powder, plus 2% polyethylene glycol and 12% water; according to the above The processing and molding step mixes the materials to obtain a wet core, and then puts the wet core into a roasting furnace, heats it with the furnace to a temperature of 290°C, heats and heats it for 1 hour at 290°C, and then heats the core with Heat the furnace to 1480°C, and heat at this temperature for 30 minutes; when the temperature in the furnace cools down to 110°C, then cool to room temperature, take out the core, put the core into hot water at 90°C, and it will be ready within 3.5 hours. It is partially dissolved, and can be fully dissolved by stirring; take some other cores and cool them to room temperature. After testing, their tensile strength is 8.5MPa, and their room temperature bending strength is 27.5Mpa.

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Abstract

The invention relates to a water-soluble ceramic core for a high-temperature alloy single crystal blade and a preparation method thereof. The electric-fused corundum powder (α-Al 2 o 3 ) as the main material, a small amount of SiO 2 with α-Al 2 o 3 Sintering occurs, thereby improving the core strength, a small amount of mineralizer MgO powder promotes its sintering, and a lower content of sodium phosphate (Na 3 PO 4 •12H 2 O) and sodium aluminate (NaAlO 2 ) at the same time as a water-soluble binder to bond the mixture and enhance the core removal ability of the core, plus an appropriate amount of polyethylene glycol as a plasticizer and water for uniform wet mixing. The invention has the advantages that the molded core is easy to remove, the molded core has relatively high strength, and the surface of the molded core has high smoothness.

Description

technical field [0001] The invention relates to a water-soluble ceramic core for a high-temperature alloy single crystal blade and a preparation method thereof, which is mainly used in the forming process of a high-temperature alloy casting with a complex inner cavity structure, such as in the high-temperature single-crystal aero-engine formed by a directional solidification method. in crystal leaves. Background technique [0002] With the continuous increase of the gas temperature before the turbine of the aero-engine, the temperature-bearing condition of the existing superalloy materials is close to the limit; therefore, improving the cooling structure of the blade and improving the cooling efficiency of the blade have become the current goals pursued by the designers and manufacturers of turbine blades. The key technology lies in the manufacture of ceramic cores; the manufacturing technology of ceramic cores is a core secret in all countries. The composition and preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 贾志宏王顺成赵玉涛徐亮
Owner JIANGSU UNIV