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A kind of superalloy and preparation method thereof

A high-temperature alloy and alloy liquid technology, applied in the field of high-temperature alloys, can solve problems such as lowering the melting point of alloys, failure to develop, and difficulty in storage

Active Publication Date: 2021-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, after adding rare and precious metal elements such as Re and Ru to the superalloy, the addition of C element is generally limited, because the C element exceeds a certain range and tends to reduce the melting point of the alloy.
However, after the addition of C element is restricted, the strength of the alloy will decrease, and the role of C element as a deoxidizer will not be able to play, making the preparation of high-purity superalloys very difficult, and industrial production will greatly increase production costs
[0004] In addition, some researchers use calcium oxide crucibles to prepare high-purity superalloy materials. However, this method at least has problems such as high cost of calcium oxide crucibles, difficulty in storage, and difficulty in preparing large-scale industrialized calcium oxide crucibles.

Method used

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  • A kind of superalloy and preparation method thereof
  • A kind of superalloy and preparation method thereof
  • A kind of superalloy and preparation method thereof

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preparation example Construction

[0043] Here, an embodiment of the present invention provides a method for preparing the above-mentioned superalloy, which can realize the preparation of a highly purified superalloy at a relatively low cost; specifically, it includes the following steps:

[0044] 1. Prepare a double-layer crucible: as figure 1 As shown, a plurality of crucible inner layer modules are stacked inside the crucible body 1, and a plurality of crucible inner layer modules form a detachable (replaceable) crucible inner layer 2 to obtain a double-layer crucible; wherein, the crucible inner layer modules Preparation materials include spontaneously gassing materials capable of releasing gas at elevated temperatures.

[0045] Here, the so-called "spontaneous gas-generating material" refers to: at high temperature, through a chemical reaction, gas is released, such as carbon monoxide, carbon dioxide, etc., which can make the superalloy melt boil after gas generation, which is beneficial to the oxygen in t...

Embodiment 1

[0064] In this embodiment, a superalloy is prepared, wherein the composition of the superalloy is shown in Table 1. C, Cr, Al, Co, Mo, Nb, W, Ta, Re, Ru and Ni are mixed according to a certain proportion as the raw material of the superalloy, and are smelted into a master alloy in a vacuum furnace. A commercial crucible (such as a magnesia crucible) with an outer layer of 25 kg is used for smelting the master alloy, and the inner layer is a spontaneous gas inner wall composed of a crucible inner layer module. Specifically, calcium carbonate, absolute ethanol, and magnesium oxide additives are mixed at a mass ratio of 8:0.5:0.5 to obtain a mixture; wherein, the particle size of calcium carbonate is 400 μm-1.0 mm, and the weight percentage of calcium carbonate with a particle size of 400 μm 10%. Put the mixture into a metal mold, apply a pressure of 0.5 MPa, and keep it at room temperature for 8 minutes to obtain a prefabricated block. The prefabricated block is pre-sintered i...

Embodiment 2

[0073]In this embodiment, a superalloy is prepared, wherein, the composition of the superalloy is shown in Table 3. C, Cr, Al, Co, Mo, Nb, W, Ta, Re, Ru and Ni are compounded according to a certain ratio, and used as raw materials for superalloys, and smelted into master alloys in a vacuum furnace. A commercial crucible (eg, an alumina crucible) with an outer layer of 75 kg is used for smelting the master alloy, while the inner layer is a spontaneous gas inner wall composed of crucible inner layer modules. Calcium carbonate, absolute ethanol and alumina additives are mixed in a ratio of 8:0.1:0.2 to obtain a mixture. Wherein, the particle size of the calcium carbonate is 400 μm-2.0 mm, wherein the weight percentage of the calcium carbonate with a particle size of 400 μm is 8%. Put the mixture into a metal mold, apply a pressure of 1 MPa, and keep it at room temperature for 10 minutes to obtain a prefabricated block. The prefabricated block is pre-sintered in the muffle furna...

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Abstract

The invention discloses a high-temperature alloy and a preparation method thereof, and relates to the technical field of high-temperature alloys. The high-temperature alloy comprises the following components in percentage by weight: 0-0.18 wt% of carbon, 0-5.6 wt% of chromium, 5.6-6.8 wt% of aluminum, 8-10.0 wt% of cobalt, 0.8-1.4 wt% of molybdenum, 7.7-9.3 wt% of tungsten, 1.4-1.8 wt% of niobium,3.5-4.5 wt% of tantalum, 3.5-4.5 wt% of rhenium, 0-3.5 wt% of ruthenium, 0-0.002 wt% of oxygen, 0-0.002 wt% of nitrogen, and the balance of nickel. The invention is mainly used for optimizing the components and the contents of the high-temperature alloy and guaranteeing the high-temperature strength of the high-temperature alloy. The preparation method of the high-temperature alloy provided by the invention can automatically generate gas in the alloy smelting process to realize both deoxidation and denitriding, and facilitates upward floating and removal of inclusions to achieve preparation of a high-purity high-temperature alloy with a lower cost.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloys, in particular to a high-temperature alloy and a preparation method thereof. Background technique [0002] Single crystal superalloys are widely used in aviation, aerospace, energy, nuclear industry, petrochemical and other fields, and are indispensable key structural materials for national defense weaponry and national economic construction. With the increase of the air inlet temperature of the aero-engine turbine, rare and precious metal elements such as Re and Ru are added to the single crystal superalloy to improve the temperature bearing capacity of the single crystal superalloy. [0003] In the prior art, after adding rare and precious metal elements such as Re and Ru to the superalloy, the addition of C element is generally limited, because the C element exceeds a certain range and tends to lower the melting point of the alloy. However, after the addition of C element is re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22C1/06C30B11/00C30B29/52
CPCC22C1/023C22C1/06C22C19/057C30B11/00C30B11/002C30B29/52
Inventor 杨彦红周亦胄王新广孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI