Method for manufacturing spherical niobium and titanium-based alloy powder with small particle size

A technology based on alloy and fine particle size, which is applied in the field of powder metallurgy, can solve the problems of low sphericity and low oxygen content, and achieve the effects of high spheroidization rate, reduced powder oxidation, and low oxygen content

Active Publication Date: 2014-04-30
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing fine-grained spherical niobium-titanium-based alloy powders, aiming to solve the problems of fine-grained, spheroidized and oxygen content control of niobium-titanium-based alloy powders. The prepared powder has a fine particle size, Advantages of good spher

Method used

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  • Method for manufacturing spherical niobium and titanium-based alloy powder with small particle size

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Example 1: Preparation of fine spherical Nb-45%Ti-3%Mo-0.5%Zr powder with an average particle size of 21 μm

[0014] The following raw materials were weighed according to the composition of the niobium-titanium-based alloy: TiNb master alloy, TiMo master alloy, zirconium sponge and Nb rod. The mass percent content of Ti, Mo, Zr and Nb elements in the niobium-titanium alloy is 45% Ti, 3% Mo, 0.5% Zr and the balance Nb. Preheat the metal mold to 350°C before smelting, increase the melting power of the water-cooled copper crucible vacuum induction melting furnace by 190kW and stop increasing the power, then melt at a constant power for 1min to obtain a melt, and obtain a niobium-titanium-based alloy casting after cooling Ingot; niobium-titanium alloy ingot in vacuum degree ≦ 10 -2 Homogenization annealing treatment is carried out in a vacuum furnace of Pa, the temperature of the homogenization annealing treatment is 800°C, and the holding time is 3 hours to obtain a niobi...

Embodiment 2

[0015] Example 2: Preparation of fine spherical Nb-40%Ti-6%Mo-1.5%Zr powder with an average particle size of 32 μm

[0016] The following raw materials were weighed according to the composition of the niobium-titanium-based alloy: TiNb master alloy, TiMo master alloy, zirconium sponge and Nb rod. The mass percentages of Ti, Mo, Zr and Nb in the niobium-titanium alloy are 40% Ti, 6% Mo, 1.5% Zr and the balance Nb. Preheat the metal mold to 400°C before melting, increase the melting power of the water-cooled copper crucible vacuum induction melting furnace by 180kW and stop increasing the power, then melt at a constant power for 2 minutes to obtain a melt, and obtain a niobium-titanium-based alloy casting after cooling Ingot; niobium-titanium alloy ingot in vacuum degree ≦ 10 -2 Homogenizing annealing treatment is carried out in a Pa vacuum furnace, the temperature of the homogenizing annealing treatment is 900°C, and the holding time is 2 hours to obtain a niobium-titanium-bas...

Embodiment 3

[0017] Example 3: Preparation of fine spherical Nb-20%Ti-4%Al-3%Cr-5%V-4.5%W-0.03%C powder with an average particle size of 15 μm

[0018] The following raw materials were weighed according to the composition of the niobium-titanium-based alloy: TiNb master alloy, TiAl master alloy, TiCr master alloy, TiW master alloy, V block and Nb rod. The contents of various alloying elements in the niobium-titanium alloy are: 20% Ti, 4% Al, 3% Cr, 5% V, 4.5% W, 0.03% graphite and the balance Nb. Preheat the metal mold to 380°C before smelting, increase the melting power of the water-cooled copper crucible vacuum induction melting furnace by 170kW and stop increasing the power, then melt at a constant power for 3 minutes to obtain a melt, and obtain a niobium-titanium-based alloy casting after cooling Ingot; niobium-titanium alloy ingot in vacuum degree ≦ 10 -2 Homogenization annealing treatment is carried out in a Pa vacuum furnace, the temperature of the homogenization annealing treatme...

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Abstract

The invention discloses a method for manufacturing spherical niobium and titanium-based alloy powder with a small particle size. The spherical niobium and titanium-based alloy powder is manufactured by the aid of vacuum induction melting, hydrogen treatment and plasma spheroidization technologies. The method includes firstly, manufacturing niobium and titanium-based spherical alloy ingots by the aid of the vacuum induction melting technology to realize a purification melting effect, reducing the quantity and the size of non-metallic inclusion to the greatest extent and performing homogenization thermal treatment on the niobium and titanium-based spherical alloy ingots to obtain ingots with uniform alloy contents; secondly, performing hydrogen treatment on the ingots to acquire hydrogen absorption niobium and titanium alloy powder; thirdly, sieving the hydrogen absorption niobium and titanium alloy powder, and then performing plasma spheroidization on the hydrogen absorption niobium and titanium alloy powder. The method has the advantages that output power, the powder feeding rate and the airflow rate are optimized in spheroidization procedures, accordingly, hollow powder can be prevented, and the fine powder yield can be increased; the spherical powder obtained by the method is excellent in dispersibility and flowability and uniform in particle size; the niobium and titanium-based alloy powder finally manufactured by the method is small in particle size, uniform in composition, good in flowability, high in spheroidization rate and low in oxygen content and is applicable to the technical field of injection molding, quick molding and thermal spraying.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a method for preparing spherical niobium-titanium alloy powder with fine grain size. Background technique [0002] Niobium-titanium-based alloys have low density, high melting point, and good thermal strength, and have important application prospects in the fields of aerospace and thermal spraying. Powder metallurgy technology is an important method for preparing niobium-titanium alloy parts, for example, injection molding and rapid prototyping technology can prepare parts with complex shapes. The performance of parts is closely related to parameters such as shape, particle size and particle size distribution of raw material powder. High-quality raw powder is a prerequisite for the development of powder metallurgy niobium-titanium-based alloys. The raw material powder used in injection molding and rapid prototyping technology requires small particle size, go...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22C1/03C22C30/00C22C27/02
Inventor 曲选辉章林李启军陈晓玮秦明礼何新波张瑞杰
Owner UNIV OF SCI & TECH BEIJING
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