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Ceramic shell preparation method for ameliorating physical sand burning of high-temperature alloy directional solidified casting

A technology of directional solidification and physical sand sticking, which is applied in the direction of casting molding equipment, casting molds, and casting mold components. Surface and overall quality, the effect of smooth surface and small roughness

Active Publication Date: 2019-11-19
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

For example, the alloy melt erodes the surface of the shell, destroys the bond between the surface layer particles and the back layer particles, and causes the surface layer particles to enter the alloy melt, resulting in inclusion defects on the casting surface
In addition, the alloy melt will generate a lot of stress on the surface of the casting during the solidification process, and the surface layer of the shell with low strength will fall off and adhere to the surface of the casting, causing sand sticky defects on the surface of the casting. Metal and molding sand form a mixture, which firmly adheres to the surface of the casting, increasing the cleaning workload of the casting

Method used

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  • Ceramic shell preparation method for ameliorating physical sand burning of high-temperature alloy directional solidified casting
  • Ceramic shell preparation method for ameliorating physical sand burning of high-temperature alloy directional solidified casting
  • Ceramic shell preparation method for ameliorating physical sand burning of high-temperature alloy directional solidified casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The process of preparing the ceramic shell in this embodiment is as follows:

[0066] 1. The wax mold combination adopts the bottom pouring system, and a small filter is embedded in the runner.

[0067] 2. To prepare the surface coating, prepare EC95(W28):EC95(W14) 1:1 mixed powder, silica sol (830), wetting agent (JFC), defoamer (n-octanol); preparation ratio For: the weight ratio of silica sol to mixed powder is 1:4, and the volume of wetting agent and defoamer is 0.12% of the volume of silica sol.

[0068] The preparation process of surface layer slurry is as follows:

[0069] Pour a certain amount of silica sol into the paint bucket, then add the wetting agent and defoamer in proportion, and start the mixer at the same time while stirring and slowly add the mixed powder. The stirring time is more than 2 hours. Measure the viscosity once or twice during stirring (viscosity should be Slightly greater than the specified viscosity), then pour it into an L-shaped mixer...

Embodiment 2

[0079] The difference from Example 1 is that the test piece is a single crystal blade test piece of a certain type. After pouring, it was found that the physical sand sticking on the surface of the casting was significantly improved ( Figure 4 (b)).

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Abstract

The invention discloses a ceramic shell preparation method for ameliorating physical sand burning of a high-temperature alloy directional solidified casting, and belongs to the technical field of ceramic shell preparation. The shell preparation method comprises the steps that a bottom pouring type pouring system is adopted for wax pattern combination at first, then surface layer slurry and reinforcement layer slurry are prepared, and afterwards, shell coating, shell dewaxing and shell roasting are sequentially conducted, wherein when the bottom pouring type pouring system is adopted for wax pattern combination, a filter screen is placed in a bottom transverse pouring gate of the bottom pouring type pouring system; when the surface layer slurry is prepared, the surface layer slurry is composed of corundum powder EC95, silica sol 830, a wetting agent JFC and a antifoaming agent of n-caprylic alcohol; and the corundum powder EC95 is formed by mixing EC95 with the particle size being W28 and EC95 with the particle size being W14 according to the weight ratio of 1:1. Through the method, the physical sand burning tendency of the casting can be reduced, the surface quality of the castingis improved, and the pass rate of the casting is increased.

Description

technical field [0001] The invention relates to the technical field of ceramic mold shell preparation, in particular to a ceramic mold shell preparation method for improving the physical sand sticking of superalloy directional solidification castings. Background technique [0002] Investment casting technology is one of the important methods for preparing aeroengine turbine blades. During the high-temperature alloy precision casting process, the ceramic shell material is soaked in the alloy melt at a high temperature above 1500°C for tens of minutes or even more than an hour. In recent years, with the design of superalloy components becoming more and more complex and the process requirements more and more stringent, the problem of interface reaction between superalloy melt and ceramic shell has gradually emerged. [0003] During investment casting, the shell acts as a "vessel" filled with molten metal. The interface interaction between the molten metal and the shell has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/08B22C1/00
CPCB22C1/00B22C9/04B22C9/043B22C9/082B22C9/086
Inventor 郑伟申健卢玉章谢光张功董加胜楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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