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A ceramic shell preparation method for improving the physical sand sticking of superalloy directional solidification castings

A technology of directional solidification and physical sand sticking, which is applied in casting molding equipment, casting molds, and casting mold components, etc., can solve the problems of increasing the cleaning workload of castings, defects of sand sticking on the surface of castings, inclusions on the surface of castings, etc. Surface and overall quality, smooth surface, low roughness effect

Active Publication Date: 2021-01-12
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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  • A ceramic shell preparation method for improving the physical sand sticking of superalloy directional solidification castings
  • A ceramic shell preparation method for improving the physical sand sticking of superalloy directional solidification castings
  • A ceramic shell preparation method for improving the physical sand sticking of superalloy directional solidification castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0068] The preparation process of the 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 and slowly add the mixed powder while stirring. The stirring time is more than 2 hours. Slightly larger than the specified viscosity), then pour it into the L-type mixer and continue to stir for 24 hours before use. The v...

Embodiment 2

[0079] The difference from Example 1 is that the test piece is a certain type of single crystal blade test piece. After pouring, it was found that the physical sand adhesion 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] Precision casting technology is one of the important methods for preparing aero-engine turbine blades. In the process of superalloy precision casting, the ceramic shell material is immersed in the alloy melt at a high temperature above 1500 °C for tens of minutes or even more than an hour. In recent years, as the composition design of superalloys becomes more and more complex and the process requirements become more and more stringent, the problem of the interface reaction between the superalloy melt and the ceramic shell gradually emerges. [0003] During investment casting, the mold shell acts as a "container" filled with molten metal. The interfacial interaction between the molten metal and th...

Claims

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Application Information

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Patent Type & Authority Patents(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