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Method for preparing Co based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method

A technology of superalloy and spiral crystallizer, which is applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of low success rate of single crystal and so on.

Inactive Publication Date: 2008-06-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the seed crystal method can effectively control the crystal orientation and solidification structure of single crystals, the success rate of single crystals is extremely low.

Method used

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  • Method for preparing Co based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method
  • Method for preparing Co based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method
  • Method for preparing Co based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The steps for preparing Co-0.4C-24.5Cr-10Ni-7W-0.2Mo-1Al-0.2Ti single crystal superalloy material with orientation and excellent solidification structure are as follows:

[0088] The first step is to prepare the seed crystal of Co-0.4C-24.5Cr-10Ni-7W-0.2Mo-1Al-0.2Ti single crystal superalloy;

[0089] Referring to Fig. 1, a test block with orientation was oriented cut on the Co-0.4C-24.5Cr-10Ni-7W-0.2Mo-1Al-0.2Ti single crystal superalloy body, and the ( 001) surface is subjected to polishing treatment and surface corrosion treatment to obtain Co-0.4C-24.5Cr-10Ni-7W-0.2Mo-1Al-0.2Ti single crystal superalloy seed crystal;

[0090] The (001) plane is the plane formed by four points A, B, C and D;

[0091] Polishing treatment conditions: Use 150#, 360#, 500#, 1000#, 2000# water-grinding sandpaper to polish the (001) surface of the test block, and then polish it on a polishing machine (Shanghai Precision Instrument Co., Ltd., PG-1A) deal with;

[0092] Surface corrosio...

Embodiment 2

[0105] The steps for preparing Co-0.5C-25Cr-9.5Ni-8W-0.2Mo-1Al-0.2Ti single crystal superalloy material with orientation and excellent solidification structure are as follows:

[0106] The first step is to prepare the seed crystal of Co-0.5C-25Cr-9.5Ni-8W-0.2Mo-1Al-0.2Ti single crystal superalloy;

[0107] Referring to Fig. 2, a test block with orientation was oriented cut on the Co-0.5C-25Cr-9.5Ni-8W-0.2Mo-1Al-0.2Ti single crystal superalloy body, and the ( 011) surface is subjected to polishing treatment and surface corrosion treatment to obtain Co-0.5C-25Cr-9.5Ni-8W-0.2Mo-1Al-0.2Ti single crystal superalloy seed crystal;

[0108] The (011) plane is the plane formed by four points A, B, C and D;

[0109] Polishing treatment conditions: Use 150#, 360#, 500#, 1000#, 2000# water-grinding sandpaper to polish the (011) surface of the test block, and then polish it on a polishing machine (Shanghai Precision Instrument Co., Ltd., PG-1A) deal with;

[0110] Surface corrosion tr...

Embodiment 3

[0123] The steps for preparing Co-0.45C-26Cr-9.5Ni-8W-0.4Mo-1Al-0.3Ti single crystal superalloy material with orientation and excellent solidification structure are as follows:

[0124] The first step is to prepare the seed crystal of Co-0.45C-26Cr-9.5Ni-8W-0.4Mo-1Al-0.3Ti single crystal superalloy;

[0125] Referring to Fig. 3, a test block with orientation was oriented cut on the Co-0.45C-26Cr-9.5Ni-8W-0.4Mo-1Al-0.3Ti single crystal superalloy body, and the ( 111) surface is subjected to polishing treatment and surface corrosion treatment to obtain Co-0.45C-26Cr-9.5Ni-8W-0.4Mo-1Al-0.3Ti single crystal superalloy seed crystal;

[0126] The (111) plane is the plane formed by four points A, B, C and D;

[0127] Polishing treatment conditions: Use 150#, 360#, 500#, 1000#, 2000# water abrasive paper to polish the (111) surface of the test block, and then polish it on a polishing machine (Shanghai Precision Instrument Co., Ltd., PG-1A) deal with;

[0128] Surface corrosion tr...

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Abstract

The present invention discloses a method adopting a seed crystal method combined with a spiral crystal selecting method to prepare Co-based single crystal superalloy. seed crystal with certain crystal orientation is directionally cut on a Co-based single crystal superalloy body; the seed crystal is put into one end of a spiral crystal selecting machine wax mold; the other end of the spiral crystal selecting machine wax mold is connected with a part wax mold; ceramic refractory slurry is smeared outside the seed crystal, the spiral crystal selecting machine wax mold and the part wax mold; a ceramic mold shell with the seed crystal is prepared through dewaxing and roasting; the ceramic mold shell is cast and molded in a single crystal furnace to prepare Co-based single crystal superalloy materials. The single crystal preparation technology of the present invention can accurately control the crystal orientation and microstructure of single crystal, so as to prepare the Co-based single crystal superalloy materials of good quality.

Description

technical field [0001] The invention relates to a method for preparing a Co-based single-crystal superalloy material, more particularly, a method for preparing a Co-based single-crystal superalloy by using a combination of a seed crystal method and a spiral crystal selection method. Background technique [0002] The high development of aerospace technology requires the engine to have a higher thrust-to-weight ratio and work efficiency, which requires the engine to have a higher operating temperature. At present, single crystal superalloys are the key materials for manufacturing advanced aeroengine turbine blades and guide vanes due to their high melting point, high temperature strength and excellent creep resistance. During the directional solidification process of single crystal superalloys, the growth direction shows an obvious preferred orientation, which often has a certain off-angle with the axial direction, which significantly reduces the performance of single crystal ...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C19/07C22F3/00B22C3/00B22D27/20
Inventor 李树索蒋立武韩雅芳武美伶
Owner BEIHANG UNIV
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