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High-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and preparation method of high-Mo Ni3Al-based monocrystal high-temperature alloy

A technology of rare earth modification and high-temperature alloy, which is applied in the field of high-temperature alloys, can solve the problem of unsatisfactory oxidation resistance of alloys, and achieve the effect of improving oxidation resistance

Inactive Publication Date: 2017-03-22
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The newly invented IC21 alloy contains 9.5wt% Mo and 1.5wt% Re, which further increases the initial melting point of the alloy and enhances the mechanical properties of the alloy, but the oxidation resistance of the alloy at high temperatures is not ideal

Method used

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  • High-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and preparation method of high-Mo Ni3Al-based monocrystal high-temperature alloy

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preparation example Construction

[0035] The present invention proposes that the rare earth element modified high Mo Ni 3 The Al-based single crystal superalloy is prepared by the following preparation method, which specifically includes the following steps:

[0036] The first step: prepare liquid metal cooling medium; high purity: purity ≥ 99.95%.

[0037] The liquid metal cooling medium is gallium indium alloy or metal tin. The preparation of the gallium-indium alloy: the raw materials of high-purity gallium (Ga) and high-purity indium (In), by weight percentage: gallium 10-30wt%, the rest is indium, weighed, put into a beaker and heat to 80°C ~200°C to make the reaction liquid, pour it into a liquid metal cooling tank as a cooling medium, and use vacuum pump oil to heat around the liquid metal cooling tank to keep the temperature of the cooling tank above 15 °C, so that the gallium-indium alloy remains liquid;

[0038] The preparation of the metal tin: heating the raw material high-purity tin to the melti...

Embodiment 1

[0054] The composition of the alloy in this case is 7.6wt% Al, 9.5wt% Mo, 1.5wt% Re, 3wt% Ta, 1.5wt% Cr, 0.005wt% C, 0.05wt% Y, 0.042wt% Dy, the rest are Ni. The rare earth element modified high Mo Ni 3 The as-cast structure of Al-based single crystal superalloy includes three phase structures of γ′ phase, γ phase and white precipitate phase rich in Mo and Re. The as-cast structure is observed under light microscope and scanning electron microscope as follows figure 1 and figure 2 shown.

[0055] The present invention proposes that the rare earth modified high Mo Ni 3 The Al-based single crystal superalloy is prepared by the following preparation method, which specifically includes the following steps:

[0056] The first step: prepare liquid metal cooling medium; high purity: purity ≥ 99.95%.

[0057] The liquid metal cooling medium is gallium indium alloy or metal tin. The preparation of the gallium-indium alloy: the raw materials high-purity gallium (Ga) and high-puri...

Embodiment 2

[0077] The composition of the alloy in this case is 7wt% Al, 8wt% Mo, 1.5wt% Re, 3wt% Ta, 1.5wt% Cr, 0.001wt% C, 0.01wt% Y, 0.01wt% Dy, The rest is Ni.

[0078] The present invention proposes that the rare earth modified high Mo Ni 3 The Al-based single crystal superalloy is prepared by the following preparation method, which specifically includes the following steps:

[0079] The first step: prepare liquid metal cooling medium; high purity: purity ≥ 99.95%.

[0080] The liquid metal cooling medium is gallium indium alloy or metal tin. The preparation of the gallium-indium alloy: the raw materials high-purity gallium (Ga) and high-purity indium (In), by weight percentage: gallium 10wt%, the rest is indium, weighed, put into a beaker and heated to 80 ° C to make it After the reaction is in a liquid state, pour it into a liquid metal cooling tank as a cooling medium, and use vacuum pump oil to heat around the liquid metal cooling tank to keep the temperature of the cooling ta...

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Abstract

The invention discloses high-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and a preparation method of the high-Mo Ni3Al-based monocrystal high-temperature alloy and belongs to the technical field of high-temperature alloy. The alloy comprises Ni, Al, Mo, Re, Ta, Cr, C, Y and Dy or Ce, an alloy casting-state structure comprises three phase structures including the gamma' phase, the gamma phase and the white precipitated phase rich in Mo and Re, the density is 7.9-8.1 g / cm<3>, and the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C. The method comprises the steps of preparing a liquid metal cooling medium, preparing a mother alloy bar, preparing Ni3Al-based monocrystal alloy seed crystals not containing rare earth elements, preparing high-Mo Ni3Al-based high-temperature alloy containing the rare earth elements through a direction monocrystal furnace, and conducting post heat treatment. The Ni3Al-based monocrystal high-temperature alloy provided by the invention is low in density and can meet the low-density requirement of aircraft engines, and the oxidization resistance of the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and in particular relates to a rare-earth-modified high-Mo Ni 3 Al-based single crystal superalloy and its preparation method. Background technique [0002] Single crystal superalloys can not only serve at temperatures close to their melting point, withstand certain stresses and resist mechanical deformation at high temperatures for a long time, but also have the ability to resist oxidation and corrosion environments. At present, superalloys have become one of the preferred materials for aeroengine turbine blades, and are widely used in the manufacture of aerojet engines and the hottest parts of various industrial gas turbines. [0003] Intermetallic compounds have excellent high-temperature mechanical properties, and their service temperature covers 650-1500°C, which has become a hotspot in the research of high-temperature structural materials. Ni 3 Al is an intermetallic comp...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/03C22F1/10C30B29/52C30B11/14
CPCC22C19/057C22C1/023C22C1/03C22C2200/00C22F1/10C30B11/14
Inventor 裴延玲白洁莹李树索宫声凯
Owner BEIHANG UNIV
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