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Preparation method of alumina ceramic shell for monocrystal blades

A technology of alumina ceramics and single crystal blades, which is applied in the field of engine blade manufacturing, can solve the problems of poor air permeability of the shell, surface pores, steel breakout, etc., and achieve the effects of good thermal shock resistance, good collapse performance, and good air permeability

Active Publication Date: 2013-04-17
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The focus of the present invention is to solve the problems of steel breakout and shell swelling in the manufacturing process of single crystal blades, and solve the problem of surface pores caused by the poor air permeability of the mold shell, and a method for preparing a new type of alumina ceramic shell for single crystal blade

Method used

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  • Preparation method of alumina ceramic shell for monocrystal blades
  • Preparation method of alumina ceramic shell for monocrystal blades
  • Preparation method of alumina ceramic shell for monocrystal blades

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for preparing an alumina ceramic shell for a single crystal blade: using ethyl silicate slurry to make a shell with a layered structure with at least 5 layers;

[0046] 1) For the first layer (surface layer) of the shell, use the ethyl silicate slurry obtained by the following two methods:

[0047] Scheme 1: Use fused corundum fine powder that meets the requirements of three particle sizes. Among all the fused corundum fine powders, the three particle sizes of the fused corundum fine powder are as follows: 1000#: 20~30%, 320# : 30~50%, 230#: 30~50%; total 100%;

[0048] Add the powder into ethyl silicate in the following order: First add the fused corundum fine powder with a particle size of 1000#, then add the fused corundum fine powder with a particle size of 320#, and finally add the fused corundum fine powder with a particle size of 230# Corundum fine powder; the viscosity is Φ4 according to the flow cup viscometer, and the flow time is 57~62 seconds;

[...

Embodiment 2

[0065] A method for preparing an alumina ceramic shell for a single crystal blade: first prepare the adhesive and the required powder for the ceramic shell according to scheme 2;

[0066] 1) For the first layer of the shell, use the ethyl silicate slurry obtained by the following scheme:

[0067] Use the fused corundum fine powder that meets the requirements of three particle sizes. Among all the fused corundum fine powders, the three particle sizes of the fused corundum fine powder are as follows: 1000#: 20%, 320#: 50%, 230 #: 30%; total 100%;

[0068] Add the powder into ethyl silicate in the following order: First add the fused corundum fine powder with a particle size of 1000#, then add the fused corundum fine powder with a particle size of 320#, and finally add the fused corundum fine powder with a particle size of 230# Corundum fine powder; the viscosity is Φ4 according to the flow cup viscometer, and the flow time is 58 seconds;

[0069] 2) Then use a mixer to stir, a...

Embodiment 3

[0073] First, make the adhesive for the ceramic shell and the required powder according to the scheme 2:

[0074] Combined use of two zirconium powders with different particle size requirements and adding ethyl silicate slurry to obtain ethyl silicate slurry; the particle size requirement is 200# ZrSO 4 Powder accounts for ZrSO 4 50% of the total weight of the powder, the particle size requirement is 325# ZrSO 4 The powder dosage is 50%; the viscosity is Φ4 according to the flow cup viscometer, and the flow time is 70 seconds;

[0075] Then, use a mixer to stir, adjust the slurry concentration while stirring, and stir for 3 to 4 hours for later use. After the prepared wax model is degreased, the shell is made according to the process in Table 2. The coated modules are dewaxed and then roasted. The process is: 500℃×3h+1050℃×10h, cooling with the furnace.

[0076] Table 2 Type Shell Coating Process Table 2

[0077]

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Abstract

The invention relates to a preparation method of an alumina ceramic shell for monocrystal blades. Ethyl silicate slurry is utilized to prepare a shell, of which the layer structure is provided with at least five layers. The method comprises steps as follows: 1) the first layer of the shell uses ethyl silicate slurry prepared by one of the following two schemes: Scheme 1: adding fused alumina fine powder with the particle size of 1000-230# into ethyl silicate, wherein the viscosity is fai4 by flow cup viscosity, and the flow clean time is 57-62 seconds; Scheme 2: adding ZrSO4 powder with the particle size of 200-325# into ethyl silicate, wherein the viscosity is fai4 by flow cup viscosity, and the flow clean time is 65-70 seconds; 2) the ethyl silicate slurry for the rest layers of the shell except the first layer satisfies the formula and preparation sequence requirements of the Scheme 1, wherein the viscosity of the mixture obtained by stirring is fai4 by flow cup viscosity, and the flow clean time is 30-35 seconds; and after the slurries are sequentially coated on the wax mold, the shell is roasted at 500-1000 DEG C DEG C for 3-15 hours, and is cooled in the furnace. The method provided by the invention can be utilized to obtain the excellent-performance ceramic shell which has the advantages of moderate thickness, favorable thermal shock resistance and good air permeability.

Description

technical field [0001] The invention relates to the manufacturing technology of engine blades, and in particular provides a method for preparing an alumina ceramic shell for single crystal blades. Background technique [0002] At present, in order to increase the thrust-to-weight ratio of advanced fighter jets and civil aviation airliners, single-crystal hollow blades with high temperature resistance, long life and high reliability are used in the turbine part. The existing ceramic shells used for directional solidification have low high-temperature strength, poor thermal shock resistance, and high residual strength of the shells, resulting in a low pass rate of single crystal blades and frequent steel breakouts. The main reason is: during the casting process of the single crystal blade, the ceramic shell has to withstand a high temperature (1600°C) and a large temperature difference (900~1200°C), and the ordinary ceramic shell cannot meet this harsh working condition. , Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 张泽海杜洪强孙革黄静史凤岭
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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