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Preparation method for low oxygen content and high alloying nickel-based mother alloy and powder

A low oxygen content, master alloy technology, applied in the field of powder metallurgy, can solve the problems of ceramic inclusions and pollution, achieve the effects of reducing oxidation and impurities, ensuring yield, and avoiding oxidation

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum induction melting can effectively control the chemical composition of the alloy and prevent the contact between the high-alloyed nickel-based alloy melt and the hydrogen, oxygen and nitrogen in the atmosphere, but the vacuum induction ingot is easily polluted by the refractory crucible and introduces ceramic inclusions.

Method used

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  • Preparation method for low oxygen content and high alloying nickel-based mother alloy and powder
  • Preparation method for low oxygen content and high alloying nickel-based mother alloy and powder
  • Preparation method for low oxygen content and high alloying nickel-based mother alloy and powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The Ni-50wt.%Cr master alloy, Ni-5wt.%B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9wt.%, as well as aluminum blocks, sponge titanium, and sponge zirconium, in 5vol .% hydrochloric acid aqueous solution for pretreatment to remove surface oxides. The pretreatment time is 30min. After washing with alcohol, it is dried in an oven at 60°C for 60min. %Ni-9.15wt.%Al-19.23wt.%Cr-6.62wt.%Mo-3.31wt.%Nb-1.15wt.%Ti-0.15wt.%Zr-0.02wt.%B-0.18wt.%C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep warm for 10 minutes, then cool down, fill ...

Embodiment 2

[0019] The Ni-50wt.% Cr master alloy, Ni-5wt.% B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9wt.%, as well as aluminum blocks, sponge titanium, and sponge zirconium, in 5wt .% hydrochloric acid aqueous solution for pretreatment to remove surface oxides. The pretreatment time is 30min. After washing with alcohol, it is dried in an oven at 60°C for 60min. %Ni-9.15wt.%Al-19.23wt.%Cr-6.62wt.%Mo-3.31wt.%Nb-1.15wt.%Ti-0.15wt.%Zr-0.02wt.%B-0.18wt.%C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep warm for 10 minutes, then cool down, fill...

Embodiment 3

[0021] The Ni-50wt.% Cr master alloy, Ni-5wt.% B master alloy, Ni-Mo master alloy, Ni-Nb master alloy with a purity greater than 99.9wt.%, as well as aluminum blocks, sponge titanium, and sponge zirconium, in 5wt .% hydrochloric acid aqueous solution for pretreatment to remove surface oxides. The pretreatment time is 30 minutes. After washing with alcohol, it is processed and dried in an oven at 60°C for 60 minutes. %Ni-9.15wt.%Al-19.23wt.%Cr-6.62wt.%Mo-3.31wt.%Nb-1.15wt.%Ti-0.15wt.%Zr-0.02wt.%B-0.18wt.%C. The raw materials were smelted in a vacuum induction melting furnace. During the smelting process, a ceramic crucible was used, and the power was increased after the furnace material was melted, so that the temperature of the molten pool rose to 1670°C, and then 2wt.% carbon block was added and kept for 30 minutes. During the process, use an electromagnetic stirrer to stir the molten pool to fully remove oxygen, then add 1wt.% Al and Ti and 0.01wt.% B, keep warm for 10 minut...

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Abstract

The invention discloses a preparation method for a low oxygen content and high alloying nickel-based mother alloy and powder and belongs to the field of powder metallurgy. The technological process of the preparation method includes the steps that firstly, a pure mother alloy ingot is prepared by means of duplex processes of vacuum smelting and electroslag remelting. In the process of vacuum smelting, a calcium oxide crucible is adopted, raw materials are pre-treated, carbon blocks are added in a refining stage for deoxidization, elements prone to the burning loss are supplemented at the end stage of smelting, and the mother alloy ingot in designed components is obtained. In the process of the electroslag smelting, by adjusting the shape, the depth, the viscosity and other parameters of a slag pond, the float-up condition of the nonmetallic inclusion is created, and the mother alloy is further purified. After the mother alloy ingot subjected to electroslag remelting is subjected to scaling, the mother alloy ingot is subjected to high-speed disk grinding breakage under the protective atmosphere, and the ultra-thin mother alloy powder is obtained. The particle size of the K418 mother alloy powder prepared through the method is smaller than 20 microns, the oxygen content is lower than 200 ppm, the sulfur content is lower than 20 ppm, after the alloy podwer is mixed with carbonyl nickel powder, sintering compacting at low temperature can be achieved, and the production cost and the process energy consumption of a high temperature alloy of the powder are greatly reduced.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a method for preparing a nickel-based master alloy with low oxygen content and high alloying and powder. Background technique [0002] The master alloy method is to prepare the alloy elements in the material into highly alloyed fine master alloy powder, then mix the master alloy powder and matrix element powder in a corresponding proportion, and then sinter to form an alloy with uniform composition. This method improves the driving potential of atom migration during sintering by increasing the specific surface area and lattice distortion of the powder, and increasing the chemical composition gradient between the powders. By rationally designing the composition of the master alloy to control the temperature and quantity of the liquid phase during the sintering process, the resistance to particle rearrangement can be further reduced, the sintering activity can be improved, and the sinte...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C19/05B22F9/04
CPCB22F9/04C22C1/023C22C1/03C22C19/056
Inventor 曲选辉陈晓玮章林刘烨李向前单化杰秦明礼
Owner UNIV OF SCI & TECH BEIJING
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