Method for enhancing laser energy absorption efficiency of metal powder material

A metal powder and laser energy technology, applied in the field of three-dimensional manufacturing, can solve problems such as difficult to use metal powder materials, achieve high sphericity, enhance laser energy absorption efficiency, improve laser processing efficiency and the effect of mechanical properties of molded parts

Active Publication Date: 2014-12-24
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is easy to introduce impurities, has high requirements on the smoothness and thickness uniformity of the coating surface, and is difficult to apply to metal powder materials.

Method used

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  • Method for enhancing laser energy absorption efficiency of metal powder material

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Effect test

Embodiment 1

[0025] The method for enhancing the laser energy absorption efficiency of the metal powder material in this embodiment is as follows: figure 1 shown, including the following steps:

[0026] 1) Select 99.5 parts of magnesium alloy powder and 0.5 part of carbon nanotube powder;

[0027] The particle size of the magnesium alloy powder selected in this step is 25 μm, the outer diameter of the carbon nanotube tube wall is 20-30 nm, the length is 20-30 μm, and the purity is >99.9%. ;

[0028] 2) Add the carbon nanotubes selected in step 1) into concentrated H 2 S0 4 / HNO 3 In mixed acid (volume ratio 3:1), purify for 30 minutes, then pickle the carbon material and wash it with deionized water for 2 to 3 times;

[0029] 3) Add the purified carbon nanotube powder in step 2) into the ethanol solution for ultrasonic treatment for 60 minutes to remove impurities such as metallic iron in the carbon nanotube powder, and then add the magnesium alloy powder selected in step 1) into the ...

Embodiment 2

[0034] Embodiment 2: The method for enhancing the laser energy absorption efficiency of metal powder materials in this embodiment includes the following steps:

[0035] 1) Select 99 parts of aluminum alloy powder and 1 part of graphene powder;

[0036] The aluminum alloy powder selected in this step has a particle size of 35 μm, a graphene sheet thickness of 1 to 50 nm, and a sheet width of 0.1 to 1 μm;

[0037] 2) Add the graphene powder selected in step 1) into concentrated H 2 S0 4 / HNO 3 In mixed acid (volume ratio 3: 1), purify for 30 minutes, then pickle the graphene powder and wash it with deionized water for 2 to 3 times;

[0038] 3) Add the purified graphene powder in step 2) into the ethanol solution for ultrasonic treatment for 60 minutes to remove impurities therein, then add the aluminum alloy powder selected in step 1) into the ethanol solution for magnetic stirring and mixing (control the mixing time for 4 hours , the magneton speed is 30r·min -1 ), and fin...

Embodiment 3

[0044] The method for enhancing the laser energy absorption efficiency of the metal powder material in this embodiment includes the following steps:

[0045] 1) choose 98 parts of copper powder and 2 parts of graphite powder;

[0046] The particle size of copper powder selected in this step is 50 μm, and the particle size of graphite powder is 100 nm;

[0047] 2) Add the graphite powder selected in step 1) into concentrated H 2 S0 4 / HNO 3 In the mixed acid (volume ratio 3: 1), purify for 30 minutes, then pickle the graphite powder and wash it with deionized water for 2 to 3 times;

[0048] 3) Add the purified graphite powder in step 2) to the ethanol solution for ultrasonic treatment for 60 minutes to remove impurities therein, then add the copper powder selected in step 1) to the ethanol solution for magnetic stirring and powder mixing (control the powder mixing time for 4 hours, magnetic The sub speed is 30r·min -1 ), and finally dry the powder obtained by magnetic sti...

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Abstract

The invention discloses a method for enhancing the laser energy absorption efficiency of a metal powder material. The method comprises the following steps of preparing metal powder and a carbon material, purifying the carbon material, uniformly mixing the metal powder and the purified carbon material, performing gas atomization treatment on a mixture of the metal powder and the carbon material to obtain a metal / carbon composite material, and performing ball-milling treatment on the metal / carbon composite material obtained by gas atomization, wherein the carbon material is a carbon nanotube, graphene, graphite or carbon black, and the amount of the carbon material is 0.5 to 10 percent based on the total amount. According to the method, the carbon material is added into the metal powder, gas atomization and ball-milling processes are sequentially used for treatment, and the powder material with a uniform particle size, high sphericity and laser absorption rate capable of reaching 70 percent is finally prepared, so that the laser machining efficiency of the powder material and the mechanical performance of a formed part can be greatly improved, and the manufacturing cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional manufacturing and relates to a method for enhancing laser energy absorption efficiency of metal powder materials. Background technique [0002] Laser processing technology has the advantages of strong processing ability, high efficiency, easy realization of flexible processing, and material saving; the process of laser processing mainly shows that the material to be processed absorbs laser energy and converts the energy into heat energy; therefore, the absorption of laser energy by materials Efficiency has a decisive influence on the laser processing process. Metal is a common laser processing material, but limited by its own performance, the laser generates strong reflection on the surface of the metal material, taking away most of the energy (the electric field of the laser on the surface of the metal material forms a standing wave node, and the free electrons are affected by the light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/08B22F3/105
CPCY02P10/25
Inventor 王林志段宣明
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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