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Method for increasing fine powder rate of gas atomization powder of titanium or titanium alloys

A pre-alloyed powder and titanium alloy technology, which is applied in the field of titanium or titanium alloy powder preparation, can solve the problems that affect the life of the equipment, the stability of the production process, the difficulty, and the increase in the oxygen content of the powder, so as to achieve good promotion and application prospects and reduce costs. Effect

Inactive Publication Date: 2019-06-14
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of in-depth understanding of the atomization mechanism at this stage, the design of the atomization nozzle is still in the empirical stage, which is very difficult and highly dependent on equipment
Simply increasing the atomization power will lead to a general increase in the oxygen content in the powder, and affect the life of the equipment and the stability of the production process

Method used

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  • Method for increasing fine powder rate of gas atomization powder of titanium or titanium alloys
  • Method for increasing fine powder rate of gas atomization powder of titanium or titanium alloys
  • Method for increasing fine powder rate of gas atomization powder of titanium or titanium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: Preparation of Ti powder with high fine powder rate by vacuum self-consumption melting casting-rolling

[0074] Sponge titanium is mixed with Y which accounts for 0.05% of the total mass of the mixed powder, and pressed into a block electrode, and the block is welded by vacuum plasma to form a consumable electrode. After 2 times of vacuum consumable smelting, the billet is opened at 1000-1250°C, rolled at 850°C, and turned into an atomized electrode rod, which is then atomized with the electrode induction melting gas atomization equipment produced by ALD Company. The atomized gas Ar gas pressure is 3MPa, melting power is 28kW. The particle size of the atomized powder is shown in Table 1. Its D50 is 56 μm, the volume ratio of fine powder in the range of 15-53 μm is 43%, and the fine powder rate is 45% higher than that of Ti powder without Y added.

Embodiment 2

[0075] Example 2: Preparation of TC4 powder with high fine powder rate by vacuum self-consumption melting casting-forging

[0076] Sponge titanium, Al-V master alloy, Al bean and 0.25% Y compound in the total weight of the mixed powder are used to press into a block electrode, and the block is welded by vacuum plasma to form a consumable electrode. After three times of vacuum self-consumption smelting, the billet is opened at 1000-1250°C, forged at 950°C, turned into an atomized electrode rod, and then atomized by the electrode induction melting gas atomization equipment produced by ALD company. The atomized gas Ar The pressure is 3MPa, and the melting power is 28kW. The particle size of the atomized powder is shown in Table 1. Its D50 is 57 μm, the volume ratio of fine powder in the range of 15-53 μm is 40%, and the fine powder rate is 73% higher than that of TC4 powder without Y added.

Embodiment 3

[0077] Embodiment 3: Cold isostatic pressing-vacuum sintering prepares Ti powder with high fine powder rate

[0078] Put hydrogenated dehydrogenated titanium powder (-3 Pa, the sintering temperature is 1250°C, the sintering time is 2h, and the temperature is lowered to room temperature with the furnace after sintering. The sintered billet is processed into an atomized electrode rod, and then the electrode induction melting gas atomization equipment produced by ALD Company is used for atomization and powder production. The atomization gas Ar gas pressure is 3MPa, and the melting power is 28kW. figure 1 (b) is the material head after the titanium electrode rod is atomized, and the material head presents a large taper, indicating that the melt has good fluidity. figure 2 (b) is the morphology of the unscreened powder after atomization, the powder surface is smooth and the sphericity is good. The particle size of the atomized powder is shown in Table 1. Its D50 is 42 μm, and the...

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Abstract

The invention relates to a method for increasing fine powder rate of gas atomization powder of titanium or titanium alloys. The method comprises the following steps of adding a small quantity of rare-earth elements to the titanium or the titanium alloys, so as to obtain an electrode bar, and then performing gas atomization to prepare powder. Compared with the prior art, the method disclosed by theinvention adds the rare-earth elements to the titanium or the titanium alloys to reduce the viscosity of a molten mass, so that the fine powder rate of the gas atomization powder is increased; the rare-earth elements can be added by methods including powder metallurgy or vacuum self-consumption melting and the like; the method disclosed by the invention can be widely applied to all kinds of titanium alloys including an alpha titanium alloy, an alpha and beta titanium alloy and a beta titanium alloy; through the adoption of the method disclosed by the invention, based on the situation that a conventional production line is not changed, the fine powder rate of the gas atomization powder of the titanium or the titanium alloys is notably increased, the produced fine powder can meet the requirements of additional material manufacturing process including selective laser melting and the like; and the method has good popularization application prospect.

Description

technical field [0001] The invention relates to the technical field of titanium or titanium alloy powder preparation, in particular to a method for increasing the fine powder rate of titanium or titanium alloy gas atomized powder. Background technique [0002] Titanium and titanium alloys have many advantages such as light weight, high strength, corrosion resistance, and non-magnetic properties, and are widely used in industrial fields. As an advanced manufacturing technology, additive manufacturing (3D printing) technology can directly manufacture products with complex shapes, so it has been widely valued in the industry. Among them, selective laser melting technology (Selective Laser Melting, SLM) of titanium and titanium alloys has broad application prospects in aerospace and medical fields due to its high forming accuracy and good surface quality. [0003] The particle size of the powder used in the SLM process is in the range of 15-53 μm, which belongs to fine powder. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08C22C14/00B33Y70/00
Inventor 孙继锋杨旗
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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