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A kind of preparation method of ceramic shell for superalloy orientation/single crystal blade casting

A technology of single crystal blades and high-temperature alloys, which is applied to casting molding equipment, casting molds, and casting mold components. The effect of high density

Active Publication Date: 2018-06-19
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

At such a high temperature, the main component of the ceramic shell, silica or alumina, will react with the carbon in the superalloy to form low-priced oxides, and the low-priced oxides will oxidize the chromium in the superalloy. Thereby chemical sticky sand is formed on the surface of the blade, but due to reasons such as preventing recrystallization of the casting, the chemical sticky sand on the surface of the casting cannot be removed by mechanical means. Urgent problems to be solved in production

Method used

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  • A kind of preparation method of ceramic shell for superalloy orientation/single crystal blade casting
  • A kind of preparation method of ceramic shell for superalloy orientation/single crystal blade casting
  • A kind of preparation method of ceramic shell for superalloy orientation/single crystal blade casting

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Experimental program
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Effect test

Embodiment 1

[0063] 1. Preparation of surface coating:

[0064] get ready 2 o 3 Ceramic powder, silica sol (830), wetting agent (JFC), defoamer (n-octanol), oxide mixture powder (molybdenum oxide and yttrium oxide); preparation ratio: silica sol and Al 2 o 3 The weight ratio of ceramic powder is 1:2.0~5.5, the wetting agent and defoamer are both 0.1~0.15% of the volume of silica sol, and the oxide accounts for 10% of the total mass of the surface coating; the preparation process: pour a certain amount of silica sol In the paint bucket, add wetting agent and defoamer in proportion, and start the mixer to add Al slowly while stirring. 2 o 3 Ceramic powder, after stirring for more than 2 hours, add oxide powder and continue stirring for 2 hours, measure the viscosity once or twice during stirring (the viscosity should be slightly higher than the specified viscosity), then pour it into the L-shaped mixer and continue stirring for 24 hours before use. The viscosity of the surface coating i...

Embodiment 2

[0080] The difference from Example 1 is that when preparing the surface coating, the oxide powders used are chromium oxide and tungsten oxide (WO 3 ), the surface of the casting sprue and the surface of the single crystal blade after the treatment of this embodiment can hardly see obvious sand sticking, and the surface condition has been significantly improved.

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Abstract

The invention discloses a preparing method for a ceramic molding shell for casting a high-temperature alloy orientation / single crystal blade and belongs to the technical field of the high-temperature alloy precision investment pattern casting technology. According to the method, a certain amount of a metal oxide mixture is absorbed from a coating of a face layer of the ceramic molding shell in advance, low-valence oxide in the ceramic molding shell can be prevented from reacting with chromium in a fused alloy, and therefore chromium in the fused alloy can be prevented from being transferred into the ceramic molding shell, the chromium transferred into the ceramic molding shell is reduced, the chemical sand burning tendency is eliminated, and the quality of the surface of a casting is improved. The prepared ceramic molding shell is good in chemical stability, high in surface density, capable of ensuring the surface quality and the size precision of a blade blank and capable of meeting the requirement for advanced orientation / single crystal blade production.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy investment precision casting technology, in particular to a method for preparing a ceramic shell for high-temperature alloy directional / single crystal blade casting. Background technique [0002] High-temperature alloys are mainly used in the manufacture of turbine blades and nozzles and other parts with complex shapes, high precision and low surface roughness. Therefore, high-temperature alloys are mostly formed by investment casting. The production process of investment precision casting is investment mold manufacturing, mold shell, alloy remelting, pouring and casting cleaning and repairing. Among them, the shell material and manufacturing process directly affect the dimensional accuracy and surface roughness of the casting. [0003] In the process of directional solidification precision casting, the mold shell is poured with molten metal at high temperature, and the mold shell ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
Inventor 郑伟申健卢玉章张健楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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