Preparing method for spherical metal powder for additional material manufacturing

A metal powder and additive manufacturing technology, applied in metal processing equipment, additive processing, transportation and packaging, etc., can solve problems such as cost and efficiency constraints, improve powder morphology, improve fluidity, and reduce adhesion and collision problems. The effect of the chance of solidifying the coarse meal

Pending Publication Date: 2019-03-19
有研增材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other is to improve the powder morphology through subsequent processing, such as plasma spheroidization, high-energy ball milling, jet milling, etc., but these methods are limited in cost and efficiency

Method used

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  • Preparing method for spherical metal powder for additional material manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt the following steps to prepare copper alloy powder for selective laser melting (SLM):

[0023] Step 1: Melting the metal or alloy raw material to obtain a metal melt;

[0024] Step 2: Gas atomization powder making, the metal melt is sent to the atomizer to atomize into metal droplets, the atomizer is equipped with a charge supply device, and the metal droplets are charged with the charge supply device charges of the same polarity;

[0025] Step 3: The electrostatic field controls the falling powder, and the two sides of the atomization area extend to the bottom to set up a horizontal electrostatic field composed of positive and negative electrodes;

[0026] Wherein, the gas pressure of the atomizer and the field strength of the electrostatic field are controlled according to the material of the metal powder, so that under the action of the electric field force, gravity and the thrust of the atomized gas, the solidified fine powder with the same polarity will be f...

Embodiment 1

[0029] The control strategy in Example 1 is: according to the CuSn10 alloy material, the atomization pressure is set to 4.0MPa, and the electric field strength is 800V / m, the purpose is to easily reduce the bonding of 0-25μm fine particle powder to unsolidified large particles.

[0030] The CuSn10 powder that present embodiment one obtains is as figure 1 shown by figure 1 It can be seen that the powder has good sphericity and the content of satellite powder is extremely low. The average powder sphericity is ≥0.95, the average particle size is 26.4 microns, the fluidity is 12.5S / 50g, and the bulk density is 4.8g / cm. 3 , After the treatment is finished, the powder is obtained in the collector and sieved into a finished powder of 10-45 μm. The powder has good fluidity during the printing process, the formed parts have little deformation, the structure is uniform, and the mechanical properties meet the requirements of use.

Embodiment 2

[0032] Adopt the following steps to prepare aluminum alloy powders for selective laser melting (SLM):

[0033] Step 1: Melting the metal or alloy raw material to obtain a metal melt;

[0034] Step 2: Gas atomization powder making, the metal melt is sent to the atomizer to atomize into metal droplets, the atomizer is equipped with a charge supply device, and the metal droplets are charged with the charge supply device charges of the same polarity;

[0035] Step 3: The electrostatic field controls the falling powder, and the two sides of the atomization area extend to the bottom to set up a horizontal electrostatic field composed of positive and negative electrodes;

[0036] Wherein, the gas pressure of the atomizer and the field strength of the electrostatic field are controlled according to the material of the metal powder, so that under the action of the electric field force, gravity and the thrust of the atomized gas, the solidified fine powder with the same polarity will b...

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Abstract

The invention relates to a preparing method for spherical metal powder for additional material manufacturing. The preparing method comprises the following steps that gas atomization powdering is conducted, metal melt is conveyed into an atomizer to be atomized into metal liquid drops, the atomizer is provided with a charge supply device, and the metal liquid drops have like polarity charges underthe action of the charge supply device; a static electric field is used for controlling powder falling, and the two sides of the atomization area extend to the lower positions to form the horizontal static electric field composed of a positive electrode and a negative electrode; and according to the metal powder material, the gas pressure of the atomizer and the field intensity of the static electric field are controlled, and solidified fine powder with like polarity charges flies and falls down along the path away from non-solidified rough powder under the action of electric field power, gravity and atomized gas thrust. The electric field is applied to control the flying track of fine-grain-size powder particles, collisions between the particles are reduced, and generation of satellite powder is effectively reduced. The powder prepared through the method is high in sphericity degree, good in mobility and suitable for serving as metal powder for additional material manufacturing.

Description

technical field [0001] The invention relates to the field of materials, in particular to the technical field of metal powder material preparation. Background technique [0002] Metal additive manufacturing is a new technology emerging in the manufacturing industry in recent years. Compared with traditional processing, it has unique advantages in complex shape realization, product customization and material utilization. At present, metal additive manufacturing is gradually being applied to actual products from model design, and its significance is beyond doubt. With the continuous development of metal additive manufacturing, the demand for additive manufacturing powder materials is also increasing. [0003] The powder materials applicable to different types of metal additive manufacturing processes are different, but the basic requirements are pure composition, good fluidity, and narrow particle size distribution. Based on the above requirements, most metal powders used in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C22C21/02B33Y70/00
CPCC22C21/02B22F9/082B33Y70/00B22F2009/0836B22F1/065
Inventor 张少明胡强张金辉赵新明王志刚赵文东朱学新刘英杰安宁徐蕾贺宝
Owner 有研增材技术有限公司
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