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

A high-temperature alloy and spiral crystal selector technology, which is applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of low success rate of single crystal

Inactive Publication Date: 2008-09-03
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 Ni based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method
  • Method for preparing Ni based single-crystal refractory alloy by employing combination of seed crystal method and screw selecting method
  • Method for preparing Ni 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

[0088] The steps for preparing Ni-4Cr-9Co-8W-2Mo-6Al-6.5Ta-2Re single crystal superalloy material with orientation and excellent solidification structure are as follows:

[0089] The first step is to prepare the seed crystal of Ni-4Cr-9Co-8W-2Mo-6Al-6.5Ta-2Re single crystal superalloy;

[0090] As shown in Figure 1, a test block with orientation was oriented cut on the Ni-4Cr-9Co-8W-2Mo-6Al-6.5Ta-2Re single crystal superalloy body, and the (001) plane of the test block Perform polishing treatment and surface corrosion treatment to obtain Ni-4Cr-9Co-8W-2Mo-6Al-6.5Ta-2Re single crystal superalloy seed crystal;

[0091] The (001) plane is the plane formed by four points A, B, C and D;

[0092] 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;

[0093] Surface corrosion treatment conditio...

Embodiment 2

[0106] The steps for preparing Ni-16Cr-8.5Co-6W-4Al-4Ti-1Ta single crystal superalloy material with orientation and excellent solidification structure are as follows:

[0107] The first step is to prepare the seed crystal of Ni-16Cr-8.5Co-6W-4Al-4Ti-1Ta single crystal superalloy;

[0108] As shown in Figure 2, a test block with orientation is directional cut on the Ni-16Cr-8.5Co-6W-4Al-4Ti-1Ta single crystal superalloy body, and the (011) surface of the test block is polished Treatment and surface corrosion treatment to obtain Ni-16Cr-8.5Co-6W-4Al-4Ti-1Ta single crystal superalloy seed crystal;

[0109] The (011) plane is the plane formed by four points A, B, C and D;

[0110] 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;

[0111] Surface corrosion treatment conditions: the polish...

Embodiment 3

[0124] The steps to prepare Ni-9Cr-5Co-5W-4Mo-6Al-2Ti single crystal superalloy material with orientation and excellent solidification structure are:

[0125] The first step is to prepare the seed crystal of Ni-9Cr-5Co-5W-4Mo-6Al-2Ti single crystal superalloy;

[0126] see image 3 As shown, a test block with orientation was oriented cut on the Ni-9Cr-5Co-5W-4Mo-6Al-2Ti single crystal superalloy body, and the (111) surface of the test block was polished and surface-corroded treatment to obtain Ni-9Cr-5Co-5W-4Mo-6Al-2Ti single crystal superalloy seed crystal;

[0127] The (111) plane is the plane formed by four points A, B, C and D;

[0128] 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;

[0129] Surface corrosion treatment conditions: the polished test block is treated with an etchant ...

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PUM

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Abstract

The invention discloses a method of preparing a Ni-based monocrystal high-temperature alloy through the crystallon method and the spiral crystal selection method, comprising: firstly a crystallon which is provided with a certain crystal orientation is cut directionally on the Ni-based monocrystal high-temperature alloy; the crystallon is extended into one side of a wax pattern of a spiral crystal selector; the other side of the wax pattern of the spiral crystal selector is connected with a parts wax pattern; and ceramics castable refractory is smeared on the outside of the crystallon, the wax pattern of the spiral crystal selector and the parts wax pattern; then a ceramics shuttering provided with the crystallon is manufactured via dewaxing and burning; and the Ni-based monocrystal high-temperature alloy material is teemed, shaped and manufactured by making use of the ceramics shuttering in a monocrystal furnace. The invention relates to a monocrystal preparation technology which can accurately control crystal orientation of the monocrystal and fine texture to manufacture the high quality Ni-based monocrystal high-temperature alloy material.

Description

technical field [0001] The invention relates to a method for preparing a Ni-based single crystal superalloy material, more particularly, a method for preparing a Ni-based single crystal superalloy by using a combination of two processes: 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B11/14C22C19/03B22C9/04B22D27/20
Inventor 李树索蒋立武韩雅芳武美伶
Owner BEIHANG UNIV
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