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Method for preparing low-cost spherical metal powder through self-shaping

A metal powder, self-shaping technology, applied in the field of powder metallurgy, can solve the problems of industrialization, large-scale production, difficulty in preparation, poor process controllability, and complicated preparation process, and achieve low equipment requirements, high spheroidization rate, and method Simple and efficient effect

Pending Publication Date: 2021-11-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the existing spherical titanium alloy powder preparation process is generally complicated, and most of them have too high cost, too low yield, or poor process controllability, etc., which lead to the difficulty of actual industrialization and large-scale production and preparation

Method used

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  • Method for preparing low-cost spherical metal powder through self-shaping
  • Method for preparing low-cost spherical metal powder through self-shaping
  • Method for preparing low-cost spherical metal powder through self-shaping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] based on figure 1 The heat treatment equipment shown in the figure controls the speed of the high-temperature section to be 7.5 rpm and the inclination angle to be 8° to prepare spherical metal powder. The specific process includes:

[0077] 1) Ball mill the titanium hydride powder. During the ball milling process: the ball-to-material ratio is 5:1, the ball milling medium is ethanol, the ball milling speed is 180 rpm, and the ball milling time is 4 h;

[0078] After ball milling, dry in a nitrogen atmosphere to constant weight, and sieve to obtain a raw material powder with a particle size of 20-60 µm;

[0079] 2) Put the raw material powder in the heat treatment equipment, and carry out high-temperature spheroidization in an argon atmosphere at 800 °C, so that the raw material powder undergoes self-shaping, and the spherical titanium alloy powder is obtained.

[0080] The oxygen content of the obtained spherical titanium alloy powder was measured, and the result show...

Embodiment 2

[0084] Based on the preparation process of Example 1, an orthogonal test was carried out.

[0085] Adjust the ball milling parameters and set up several test groups, as shown in the table below. In the blank group, ball milling was not performed, and step 2 was directly carried out with titanium hydride powder as the raw material powder.

[0086]

[0087] The same detection as in Example 1 was performed on each of the above test groups. Some test results are shown in the table below.

[0088]

[0089] It can be clearly seen from the data in the table above. With the change of ball milling time, the oxygen content in the final spherical titanium alloy powder will change relatively significantly, but the effect on the spheroidization rate of the spherical titanium alloy powder is relatively small. The milling speed basically has no effect on the oxygen content of the spherical titanium alloy powder. However, the oxygen content of the blank control group is significantl...

Embodiment 3

[0092] Based on the preparation process of Example 1, an orthogonal test was carried out.

[0093] Adjust high-temperature spheroidization parameters and set up several test groups, as shown in the table below.

[0094]

[0095] The same detection as in Example 1 was performed on each of the above test groups. The test results are shown in the table below.

[0096]

[0097] It can be clearly seen from the data in the table above. When the heat treatment is carried out under longer or shorter time conditions, the powder fluidity of the spherical titanium alloy powder will be seriously affected. Combined with SEM characterization and macroscopic observation, it is found that during the short-term high-temperature spheroidization process, a large number of powders have a low degree of spheroidization, and powders with a high degree of spheroidization only reach a near-spherical degree, while longer high-temperature spheroidization Treatment will cause some powders to stick...

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Abstract

The invention belongs to the field of powder metallurgy, and particularly relates to a method for preparing low-cost spherical metal powder through self-shaping. The method comprises the steps that raw material powder is placed in heat treatment equipment to be subjected to high-temperature spheroidizing, so that the raw material powder is subjected to self-shaping, and the spherical metal powder is obtained. An inclined rotatable high-temperature section is arranged in the heat treatment equipment, and the high-temperature section can drive raw material powder to continuously roll and / or collide with one another and / or grind and / or metallurgically bond, so that the powder is rapidly spheroidized; meanwhile, the raw material powder rolls towards the low-position end; and the raw material powder is metal powder. The method is simple and efficient, and the spheroidizing efficiency of the metal powder is high; equipment requirements are low, and the equipment can be obtained by simply modifying existing equipment; the cost is low, meanwhile, drying of the metal powder is achieved, impurities and the like are not introduced in the spheroidizing process, and a product capable of being directly used can be obtained; and compared with an existing spheroidizing method, the material cost and the energy consumption cost are remarkably reduced.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a method for preparing low-cost spherical metal powder by self-shaping. Background technique [0002] Titanium alloy has excellent specific strength, low thermal expansion coefficient, outstanding biocompatibility and good corrosion resistance, and has been widely used in aerospace, marine ships, medical equipment, petroleum energy and other fields. However, the processing and cutting properties of titanium alloys are poor, and it is difficult to prepare complex titanium alloy parts by traditional methods. In order to reduce the cutting process of materials and improve the utilization rate of materials, the powder metallurgy technology using powder as raw material can realize the near-net shape of materials, and the products have a series of advantages such as fine and uniform structure and controllable composition, which are ideal for manufacturing titanium alloys. One of the c...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04B33Y70/00C22C14/00
CPCC22C14/00B22F9/04B33Y70/00B22F2009/043
Inventor 张惠斌徐圣航兰俊杰郭菲沈凯杰郑国渠
Owner ZHEJIANG UNIV OF TECH