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Method for purified smelting of high-temperature alloy by using yttrium oxide crucible

A technology of superalloy and yttrium oxide, which is applied in the direction of improving energy efficiency and process efficiency, can solve the problems of purification and melting temperature limitation, increasing melting cost, increasing operation difficulty, etc., to reduce energy consumption and easy operation and control. , the effect of eliminating the influence

Active Publication Date: 2014-01-22
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the above-mentioned traditional crucible materials are used to smelt high-temperature alloys containing a large amount of highly active elements Ti, Al, Hf, Nb, Ta, Re and rare earth elements, etc., it is easy to cause chemical reactions between the crucible materials and the active elements in the alloy, resulting in their formation into the alloy. Oxygen in
And when the above crucible is used, the purification melting temperature is limited
[0005] In addition, in order to achieve a better purification effect, when using the above-mentioned crucible materials to melt superalloys, a complicated melting process has to be adopted, which not only increases the difficulty of operation, but also increases the cost of melting

Method used

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  • Method for purified smelting of high-temperature alloy by using yttrium oxide crucible

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Utilize yttrium oxide crucible to 25Kg rhenium-containing Ni 3 The invention discloses a method for purifying and smelting Al-based single crystal superalloy, and the steps of the method are charging→purifying and smelting→casting molding. specifically:

[0056] Step 1: Prepare superalloy raw materials according to target composition

[0057] The purity of nickel (Ni) used in the prepared raw materials is 99.95wt%, the purity of aluminum (Al) is 99.85wt%, the purity of molybdenum (Mo) is 99.90wt%, the purity of rhenium (Re) is 99.95wt%, dysprosium The purity of (Dy) is 99.99wt%, and the purity of yttrium (Y) is 99.99wt%;

[0058] Step 2: Install Crucible

[0059] Knot the yttrium oxide crucible and install it in a vacuum induction furnace, and sinter the crucible at 900°C for 2 hours;

[0060] Step 3: Ingot Mold

[0061] Put the yttrium oxide mold shell into the molding sand box for molding, then put it into the resistance furnace to raise the temperature to 800°C,...

Embodiment 2

[0072] A method for purifying and smelting 25Kg of K438 alloy by using an yttrium oxide crucible, the steps of which are charging→purifying and smelting→casting. specifically:

[0073] Step 1: Prepare superalloy raw materials according to target composition

[0074] The purity of nickel (Ni) used in the preparation of raw materials is 99.95wt%, the purity of aluminum (Al) is 99.85wt%, the purity of titanium (Ti) is 99.76wt%, the purity of molybdenum (Mo) is 99.90wt%, chromium The purity of (Cr) is 99.98wt%, the purity of cobalt (Co) is 99.99wt%, the purity of tungsten (W) is 99.80wt%, the purity of niobium (Nb) is 99.90wt%, and the purity of tantalum (Ta) is 99.90wt%; the purity of iron (Fe) is 99.80wt%, the purity of zirconium (Zr) is 99.90wt%, and the purity of carbon (C) is 99.75wt%; boron (B) is added in the form of Ni-B alloy, Wherein the B content is 16wt%;

[0075] Step 2: Install Crucible

[0076] Knot the yttrium oxide crucible and install it in a vacuum induction...

Embodiment 3

[0089] A method for purifying and smelting 25Kg of GH4049 alloy by using an yttrium oxide crucible, the steps of which are charging→purifying and smelting→casting. specifically

[0090] Step 1: Prepare superalloy raw materials according to target composition

[0091] The purity of nickel (Ni) used in the prepared raw materials is 99.95wt%, the purity of aluminum (Al) is 99.85wt%, the purity of titanium (Ti) is 99.76wt%, the purity of molybdenum (Mo) is 99.90wt%, chromium The purity of (Cr) is 99.98wt%, the purity of cobalt (Co) is 99.99wt%, the purity of tungsten (W) is 99.80wt%, the purity of iron (Fe) is 99.80wt%, and the purity of vanadium (V) is 99.90wt%, the purity of cerium (Ce) is 99.90wt%, the purity of carbon (C) is 99.75wt%; boron (B) is added in the form of Ni-B alloy, and the B content is 16wt%;

[0092] Step 2: Install Crucible

[0093] Knot the yttrium oxide crucible and install it in a vacuum induction furnace, and sinter the crucible at 900°C for 4 hours;

...

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Abstract

The invention discloses a method for purified smelting of high-temperature alloy by using an yttrium oxide crucible. The method comprises the following steps of loading, purified smelting and pouring. The method disclosed by the invention just adopts a simple smelting process without smelting and adding a deoxidizing agent for many times to reduce the content of O and N to below 5ppm, so that the process step is remarkably simplified and the energy consumption is remarkably reduced. According to the method provided by the invention, no strong deoxidizing agents are added or carbon element is just added in an allowable range of an alloy composition standard in the early smelting period to deoxidize without guidance of harmful elements which need to be controlled in content, so that the influence of the harmful elements on an alloy melt is eliminated while purification is carried out.

Description

technical field [0001] The invention relates to the field of vacuum induction smelting, and more particularly refers to a method for purifying and smelting superalloys using yttrium oxide crucibles. Background technique [0002] With the continuous development of aerospace, petrochemical, transportation, energy and power industries, the demand for high-temperature alloys is increasing, and the quality requirements for their parts are also getting higher and higher. In addition to solid solution strengthening and precipitation strengthening elements in superalloys, there are dozens of trace elements. The content of these trace elements is very low, and some even in the order of ppm can obviously affect the performance of superalloys. Trace elements are usually divided into beneficial and harmful, the former such as B, Mg, C, Zr and rare earth elements, etc., while the latter are impurity elements, including residual gas elements O, N, etc. Studies have shown that when the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/04
CPCY02P10/25
Inventor 徐惠彬白洪波张花蕊张虎
Owner BEIHANG UNIV
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