Method for preparing nickel-tungsten-yttrium (III) oxide master alloy with uniform tissue for casting

A technology of diyttrium trioxide and master alloy, which is applied in the field of preparation of nickel-tungsten-diyttrium trioxide master alloy with uniform structure for casting, achieving huge economic value and social value, fine grain size and good technical effect

Inactive Publication Date: 2010-06-09
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many difficulties in the production of oxide-dispersed superalloys by casting, especially in the oxide master alloy for casting. Casting alloys are generally hereditary and have a uniform structure of nickel-tungsten-dioxide Yttrium master alloy is an ideal master alloy, how to prepare it is an urgent problem to be solved

Method used

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  • Method for preparing nickel-tungsten-yttrium (III) oxide master alloy with uniform tissue for casting
  • Method for preparing nickel-tungsten-yttrium (III) oxide master alloy with uniform tissue for casting

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Effect test

Embodiment 1

[0036] Soluble nickel salt, tungsten salt, and yttrium salt are made into solutions, and the aqueous solutions of soluble nickel salt, tungsten salt, and yttrium salt should not have any chemical reaction with each other, specifically nickel nitrate, yttrium nitrate, and ammonium metatungstate. The distribution ratio is Ni:W:Y 2 o 3 =9: 81: 10 (mass ratio), the above solution is made into the precursor powder of nickel tungsten yttrium salt by high-temperature atomization drying method, and the atomization drying adopts the form of centrifugal atomization drying, and then the above nickel tungsten yttrium salt precursor is The powder is roasted into nickel-tungsten-yttrium oxide composite powder; the roasting process is divided into two steps of roasting: the first step is slow low-temperature roasting, the roasting temperature is 350°C, and the roasting time is 3 hours, and the second step is high-temperature roasting solution, the roasting temperature is 750°C, and the roas...

Embodiment 2

[0039] Make a solution of soluble nickel salt, tungsten salt, and yttrium salt, specifically nickel nitrate, yttrium nitrate, and ammonium metatungstate, and the composition ratio is Ni:W:Y 2 o 3 =9.5: 85.5: 5 (mass ratio), the above solution is made into the precursor powder of nickel tungsten yttrium salt by high-temperature atomization drying method, and the atomization drying adopts the form of centrifugal atomization drying, and then the above-mentioned nickel tungsten yttrium salt precursor is The powder is roasted into nickel-tungsten-yttrium oxide composite powder; the roasting process is divided into two steps of roasting: the first step is slow low-temperature roasting, the roasting temperature is 450°C, and the roasting time is 3 hours, and the second step is high-temperature roasting solution, the roasting temperature is 750°C, and the roasting time is 2 hours. The precursor powder is roasted in an air atmosphere to ensure the complete completion of the oxidation r...

Embodiment 3

[0042] The soluble nickel salt, tungsten salt, and yttrium salt are made into solutions, and the aqueous solutions of the soluble nickel salt, tungsten salt, and yttrium salt should not have any chemical reaction with each other. Specifically nickel nitrate, yttrium nitrate and ammonium metatungstate, the composition ratio is Ni:W:Y 2 o 3 = 9.2: 82.8: 8 (mass ratio), the above-mentioned solution is made the precursor powder of nickel tungsten yttrium salt by centrifugal atomization drying method, then the above-mentioned nickel tungsten yttrium salt precursor powder is baked into nickel tungsten yttrium oxide compound Powder; the roasting process is divided into two steps of roasting: the first step is slow low-temperature roasting at 400°C for 3 hours, the second step is high-temperature roasting at 750°C, and For 2 hours, the precursor powder is baked in an air atmosphere to ensure that the oxidation reaction is completely completed; the above-mentioned nickel-tungsten-yttr...

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Abstract

A method for preparing a nickel-tungsten-yttrium (III) oxide master alloy with uniform tissue for casting is characterized by firstly preparing soluble nickel salt, tungsten salt and yttrium salt into solution (chemical reaction does not happen between the salt solution); preparing the solution into precursor powder; roasting and decomposing the precursor powder into composite oxide powder; finally reducing the composite oxide powder into composite nickel-tungsten-yttrium (III) oxide powder; and forming the composite powder, sintering under the reducing atmosphere and taking out after cooling, thus preparing the nickel-tungsten-yttrium (III) oxide master alloy. The method is characterized by simpler technological process, low cost and good technical effect and has great economic and social value.

Description

technical field [0001] The invention relates to the preparation technology of superalloy materials, and in particular provides a method for preparing a nickel-tungsten-yttrium trioxide master alloy with uniform structure (fine grain) for casting. Background technique [0002] Superalloys are irreplaceable key structural materials for high-temperature parts of military and civil aero-engines and gas turbines, especially turbine blades, guide vanes, turbine disks and combustion chambers. They are the foundation of a country's aerospace industry. The proportion of superalloys in engines is as high as 60%, and the level of superalloys reflects a country's national defense strength and industrial level to a certain extent. [0003] The traditional strengthening mechanisms of superalloys mainly include solid solution strengthening, precipitation strengthening, grain boundary strengthening and production process strengthening. In the strengthening process, oxide dispersion strengt...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F3/16
Inventor毛萍莉姜卫国胡壮麟刘正
OwnerSHENYANG POLYTECHNIC UNIV