Preparation method of thin-wall high-strength mold shell for single crystal blade manufacturing

A single crystal blade, high-strength technology, used in single crystal growth, manufacturing tools, casting and molding equipment, etc., can solve problems such as increased production costs and complex casting processes, and can improve thermal conductivity, reduce the number of mold shell layers, and have The effect of improving the temperature gradient

Inactive Publication Date: 2013-08-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these two methods require the transformation of the furnace body and the addition of a large number of auxiliary equipment. The casting process becomes very complicated and the production cost is greatly increased.
Therefore, although these two methods have been studied in large quantities for more than ten years, they have not been applied in production so far.

Method used

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  • Preparation method of thin-wall high-strength mold shell for single crystal blade manufacturing
  • Preparation method of thin-wall high-strength mold shell for single crystal blade manufacturing
  • Preparation method of thin-wall high-strength mold shell for single crystal blade manufacturing

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Experimental program
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Effect test

Embodiment 1

[0021] 1. Shell making process

[0022] Different from ordinary investment precision casting mold shells, the mold shells used for directional solidification of single crystals not only need excellent high temperature strength, but also require strong heat dissipation performance of the mold shells. Therefore, low-density ceramic slurry and fine-grained sand are mainly used in shell making. The specific process flow is as follows.

[0023] (1) Slurry preparation, the slurry uses silica sol as binder (model: JN-30), high-purity corundum powder (Al 2 o 3 The content is greater than 99%, and the particle size is 320 mesh) is prepared as powder.

[0024] First, pour a certain amount of silica sol into the mixing tank, and the pouring amount is selected according to the required amount; then add a wetting agent (JFC, non-ionic surfactant) to ensure the coating and hangability of the slurry on the wax model. The amount added is about 0.1%-0.5% of the mass of silica sol; then cor...

Embodiment 2

[0058] 1. Molding process:

[0059] A 6-layer shell was prepared, and the slurry configuration, slurry coating, sand pouring, and slurry sealing process were the same as in Example 1, and the specific parameter requirements were shown in Table 4.

[0060] Table 4 shell making process parameters

[0061]

[0062] 2. Fiber coating drying process:

[0063] The prepared shell shape is the same as that in Example 1. After dewaxing and roasting, the fiber is wound and dried according to the process in Table 5. The obtained shell shape was applied to VDF-10 single crystal furnace for directional solidification, and single crystal samples have been successfully obtained.

[0064] Table 5 drying process parameters

[0065] Drying temperature / ℃ humidity / % Drying time / h Wind speed / m·s -1 25±5 ≤50 30-40 3-5

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Abstract

The invention discloses a preparation method of a thin-wall high-strength mold shell for single crystal blade manufacturing. The preparation method comprises the following steps of: A1, a shell manufacturing process: (1), size preparation, (2) slurry hanging, (3) sand spraying, (4) repeating the operations till preset number of layers are formed, (5) slurry sealing, dipping a wax mold in a slurry barrel, completely dipping, taking out, and drying; and A2, winding carbon fibers and drying. The carbon fibers are wrapped; compared with a traditional silicasol mold shell, the thin-wall high-strength mold shell has the advantages that under the precondition of ensuring the thermal strength of the mold shell, the layer number of the mold shell is reduced, so that the integral thickness of the mold shell is reduced, the heat conduction capacity of the mold shell is improved, and the preparation method is beneficial to the improvement of temperature gradient. Adopted carbon fiber cloth is made of amorphous graphite; and the amorphous graphite has a thermal conductivity lambda 2 of more than 100, and is an ideal heat conduction material; and the amorphous graphite has a tensile strength of more than 3,400 MPa, and creates a condition for reducing the thickness of the mold shell.

Description

technical field [0001] The invention relates to the field of directional solidification of high-temperature alloys, in particular to the manufacturing process of single-crystal turbine blades, and specifically uses carbon fiber coating to prepare a thin-walled high-strength formwork. Background technique [0002] The use of directional solidification of superalloys to cast single crystal turbine blades has become one of the key technologies for manufacturing high-efficiency aeroengines. Production of such blades is currently carried out using Bridgman directional solidification. For this reason, the ceramic formwork needs to be preheated to a temperature higher than the melting point of the alloy in the hot zone on the upper part of the furnace body, and then poured into the high-temperature alloy melt melted by induction, and then the formwork slowly descends at a predetermined speed and passes through the The heat insulation baffle enters the cold zone at the lower part o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00C30B11/00
Inventor 贾志宏徐维台朱翔孙少纯赵玉涛徐基晨谌鸿俊段江楠
Owner JIANGSU UNIV
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