Manufacturing method for minuteness spherical titanium powder

A manufacturing method and powder technology are applied in the manufacturing field of fine spherical titanium powder, which can solve the problems of not meeting the requirements of injection molding process, increasing hydrogenation, crushing, dehydrogenation, and reducing the particle size of fine titanium powder, and achieving low oxygen content. , The effect of improving uniformity and reducing particle size

Active Publication Date: 2016-01-20
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest problem of this preparation process using fine titanium powder as raw material is that the product has a high oxygen content, and the oxygen increase in the preparation process cannot be avoided, which cannot meet the requirements of the injection molding process. It is also caused by the reduction of particle size and the increase of surface area during the crushing process, which is also inevitable in the process of preparing spherical powder from fine titanium powder.
At the same time, the raw material for preparing spherical powder is obtained by hydrogenation dehydrogenation process. Compared with the process of preparing spherical titanium powder with sponge titanium as the starting material, it increases the process of hydrogenation, crushing, dehydrogenation, and crushing again. The process will not only affect the product purity, but also increase the production cost, which makes this process difficult to industrialize

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  • Manufacturing method for minuteness spherical titanium powder

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Effect test

Embodiment 1

[0023] Using titanium sponge as raw material, it is made into rods or wires, which are sent into the melting chamber through a continuous feeder. The raw material feeding rate is 0.2kg / min, and it is induced by double femtosecond pulsed laser with a pulse interval of 2ns. The pulse width is 10fs, the laser is focused in the air and breaks down the air to generate plasma, and the titanium sponge rod or wire is heated and melted under the action of the plasma. The melt flow is poured into the tundish of the atomization powder making equipment, and then transferred into the atomization chamber through the guide tube, and the inner diameter of the guide tube is 4mm. Vacuumize the atomization chamber and melting chamber, and the vacuum degree reaches 1×10 -4 Pa. Then the titanium melt flows through the centrifugal nozzle at a certain flow rate, and the thin liquid layer is crushed under the action of ultrasonic vibration, and the small liquid droplets aroused splash out from the w...

Embodiment 2

[0026]Using titanium sponge as raw material, it is made into rods or wires, which are sent into the melting chamber through a continuous feeder. With a width of 100fs, the laser is focused in the air to break down the air to generate plasma, and the titanium sponge rod or wire is heated and melted under the action of the plasma. The melt flow is poured into the tundish of the atomization powder making equipment, and then transferred into the atomization chamber through the guide tube, and the inner diameter of the guide tube is 5mm. Vacuumize the atomization chamber and melting chamber, and the vacuum degree reaches 1×10 -2 Pa. Then the titanium melt flows through the centrifugal nozzle at a certain flow rate, and the thin liquid layer is crushed under the action of ultrasonic vibration, and the aroused small droplets splash out from the wave crest to form mist, realizing primary atomization. The second layer of the nozzle adopts the Laval nozzle structure. After the primary...

Embodiment 3

[0029] Using titanium sponge as raw material, it is made into rods or wires, which are sent into the melting chamber through a continuous feeder. The raw material feeding rate is 1.5kg / min, and it is induced by double femtosecond pulsed laser with a pulse interval of 4ns. The pulse width is 100fs, the laser is focused in the air and breaks down the air to generate plasma, and the titanium sponge rod or wire is heated and melted under the action of the plasma. The melt flow is poured into the tundish of the atomization powder making equipment, and then transferred into the atomization chamber through the guide tube, and the inner diameter of the guide tube is 4mm. Vacuumize the atomization chamber and melting chamber, and the vacuum degree reaches 1×10 -3 Pa. Then the titanium melt flows through the centrifugal nozzle at a certain flow rate, and the thin liquid layer is crushed under the action of ultrasonic vibration, and the aroused small droplets splash out from the wave cr...

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Abstract

The invention discloses a manufacturing method for minuteness spherical titanium powder, and belongs to the technical field of metal and alloy powder manufacturing. The manufacturing method includes the steps that titanium sponge serves as a raw material to be manufactured into a bar or a wire; in a melting chamber, under the vacuum condition, double-femtosecond pulse lasers are used for inducing, heating and melting, and the melted raw material is poured into a tundish; the raw material is transferred into an atomizing chamber, under the vacuum condition, inert gas led into a centrifugal stem bar breaks titanium melt; further breaking is carried out through a laval spraying nozzle, and micron-order titanium liquid is manufactured; and finally, the micron-order titanium liquid is contained in an argon filling medium tank to be solidified and cooled, and the minuteness spherical titanium powder can be obtained after screening is carried out. The double-femtosecond pulse lasers are used for rapidly and efficiently melting titanium in a pure manner, and the even, stable and continuous alloy liquid flow can be formed; in addition, the melting and pulverization efficiency is high, and the atomizing yield and the powder yield of the metal powder are improved; and the manufactured minuteness spherical titanium powder is high in degree of sphericity and low in oxygen content.

Description

technical field [0001] The invention relates to the technical field of powder preparation technology, and relates to a method for manufacturing fine spherical titanium powder. Background technique [0002] Titanium and titanium alloys have excellent properties such as low density, high specific strength, corrosion resistance, and heat resistance, and are widely used in aerospace and other fields. Compared with forging, casting and other preparation methods, forming metal parts with complex shapes by powder metallurgy has the advantages of high material utilization rate and short process flow, and has become an important way to reduce the manufacturing cost of titanium and titanium alloy parts. The performance of titanium powder is the key factor to determine the quality of titanium and titanium alloy powder metallurgy products. In recent years, the preparation of titanium and titanium alloy powders with high purity, good sphericity, low oxygen content and small particle siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
Inventor 赖建中陈光王会芳
Owner NANJING UNIV OF SCI & TECH
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