Method and device for electromagnetically assisted laser printing of NiCrAlY-Al2O3 ceramic

A technology that assists lasers and ceramics. It is applied in the direction of additive manufacturing and additive processing. It can solve the problems of unstable workpiece structure, difficulty in maintaining gradient structure, and deterioration of structural strength of components, so as to overcome the low structural strength and restrain Marangoni. Effect of convection, good structural properties

Active Publication Date: 2021-03-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of laser selective melting, a metal molten pool will be formed in the selected area. The area of ​​the molten pool printed by laser selective melting is very small, usually less than 1 square millimeter. There is a large temperature gradient in the molten pool, which will form a strong The marangoni convection in the selected area causes the metal solution in the selected area to mix with each other. For functionally graded materials, this convection will change the metal gradient structure in the local area. When the multi-layer gradient structure passes through the marangoni convection, the metal component itself It will be difficult to maintain the gradient structure, and even the structural strength of the component itself will be dete

Method used

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  • Method and device for electromagnetically assisted laser printing of NiCrAlY-Al2O3 ceramic
  • Method and device for electromagnetically assisted laser printing of NiCrAlY-Al2O3 ceramic
  • Method and device for electromagnetically assisted laser printing of NiCrAlY-Al2O3 ceramic

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] Example 1】

[0044] Preparation of Nicraly-alone with 12-layer structure 2 O 3 Ceramic function gradient material plate, each layer of powder laying thickness is 0.05 mm, wherein the first layer is laid, the second layer is laid containing 90 (Wt)% Nicral powder and 10 (WT)% Al. 2 O 3 The mixed powder of the powder, the third layer is laid containing 80 (WT)% Nicraly powder and 20 (wt)% Al 2 O 3 The mixed powder of the powder, the third layer is laid containing 70 (wt)% Nicraly powder and 30 (wt)% Al 2 O 3 Mixed powder of powder, push it according to a second, last layer of AL 2 O 3 Powder, the speed of laser printing is 0.5 m / s, the laser power is 25,000 mw / cm2, the print laser is 0.1 mm, and when the first layer is printed, the current of the first excitation coil is 6A, and the current of the second excitation coil is 8A. When printing the second layer, the current of the first excitation coil is 5.8a, the current of the second excitation coil is 7.9a, and when the t...

Example Embodiment

[0045] [Example 2]

[0046] Preparation of Nicraly-alone having a 22-layer structure 2 O 3 The plate material of the ceramic function gradient material is 0.03 mm per layer, wherein the first layer is laid, the second layer contains 95 (Wt)% Nicral powder and 5 (Wt)% Al. 2 O 3 The mixed powder of the powder, the third layer is laid contains 90 (wt)% Nicraly powder and 10 (wt)% Al 2 O 3 The mixed powder of the powder, the third layer is laid containing 85 (WT)% Niclass powder and 15 (wt)% Al 2 O 3 Mixed powder of powder, push it according to a second, last layer of AL 2 O 3 Powder, the speed of laser printing is 1 m / s, the laser power is 20000 w / cm2, the print laser is 0.1 mm, and when the first layer is printed, the current of the first excitation coil is 6A, and the current of the second excitation coil is 8A, When printing the second layer, the current of the first excitation coil is 5.9a, and the current of the second excitation coil is 7.95a, when the third layer is printe...

Example Embodiment

[0047] [Example 3]

[0048] Preparation of Nicraly-alone with 42-layer structure 2 O 3The plates of the ceramic function gradient material, each layer of powder laying thickness is 0.02 mm, wherein the first layer laying Nicraly powder, the second layer is laid containing 97.5 (wt)% Nicraly powder and 2.5 (wt)% Al 2 O 3 The mixed powder of the powder, the third layer is laid containing 95 (WT)% Nicraly powder and 5 (Wt)% Al 2 O 3 The mixed powder of the powder, the third layer is laid contains 92.5 (wt)% Nicraly powder and 7.5 (wt)% Al 2 O 3 Mixed powder of powder, push it according to a second, last layer of AL 2 O 3 Powder, the laser printing speed is 2 m / s, the laser power is 10,000 W / cm2, the print laser is 0.1 mm, and when the first layer is printed, the current of the first excitation coil is 6A, and the current of the second excitation coil is 8A, When printing the second layer, the current of the first excitation coil is 5.95a, the current of the second excitation coil...

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PUM

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Abstract

The invention discloses a method and device for electromagnetically assisted laser printing of NiCrAlY-Al2O3 ceramic. The device comprises a working cylinder, two first excitation coils, a laser headand a galvanometer, wherein the two first excitation coils are fixedly installed at two sides of a forming area of the working cylinder separately; a magnetic induction line formed between the two first excitation coils covers the whole forming area of the working cylinder; the laser head and the galvanometer are both installed above the working cylinder; and laser emitted by the laser head is reflected by the galvanometer and then emitted into the forming area of the working cylinder. Additive printing is carried out in a layer-by-layer powder laying and laser printing manner, and convectionof a metal solution in a molten pool is suppressed through the excitation coils, so that the mechanical performance of the functionally graded material is improved.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing, and relates to an electromagnetic-assisted laser printing NiCrAlY-Al 2 o 3 Ceramic method and device, more specifically, relates to an electromagnetic-assisted laser printing NiCrAlY-Al 2 o 3 Method and device for ceramic functionally graded materials. Background technique [0002] In recent years, in the wave of rapid development of aerospace, national defense and military industries, new challenges have been raised to the high-performance requirements of materials. Traditional single homogeneous materials have been unable to meet the requirements, and many heterogeneous composite materials have emerged as the times require. Gradient material is one of them. Compared with traditional materials, its composition or structure changes gradually and continuously from one side to the other, which can effectively reduce the interface stress concentration caused by sudden changes in compos...

Claims

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Application Information

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IPC IPC(8): B22F12/41B22F10/28B22F10/50B33Y30/00B33Y10/00
CPCB33Y30/00B33Y10/00
Inventor 魏青松程坦李继康
Owner HUAZHONG UNIV OF SCI & TECH
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