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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 deteriorated due to the mixing of two extremely poorly compatible materials in the gradient structure, and the appearance will deteriorate, making it difficult to meet the production and manufacturing requirements of functionally graded materials.
Especially NiCrAlY-Al 2 o 3 For ceramic functionally graded materials, two materials with different properties are irradiated by high-energy lasers, and the molten pool part forms convection, so that the two phases are mixed again, breaking the original structure of the gradient material. When the number of forming layers is small, the convection will produce The effect is not big, but for multi-layer molding, the destruction of the gradient structure makes the overall structure of the workpiece unstable, brittle and easy to damage

Method used

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

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Effect test

Embodiment 1

[0044] Preparation of a NiCrAlY-Al with a 12-layer structure 2 o 3 The plate of ceramic functionally graded material, the thickness of each layer of powder laying is 0.05mm, wherein the first layer of laying NiCrAlY powder, the second layer of laying contains 90 (wt)% NiCrAlY powder and 10 (wt)% Al 2 o 3 Mixed powder of powder, the third layer laying contains 80(wt)% NiCrAlY powder and 20(wt)% Al 2 o 3 Mixed powder of powder, the third layer laying contains 70(wt)% NiCrAlY powder and 30(wt)% Al 2 o 3 powder mixed powder, and so on, the last layer laying Al 2 o 3 Powder, the speed of laser printing is 0.5m / s, the laser power is 25000mW / cm2, the diameter of the printing laser is 0.1mm, when printing the first layer, 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, and the current of the second excitation coil is 7.9A. When printing the thi...

Embodiment 2

[0046] Preparation of a NiCrAlY-Al with a 22-layer structure 2 o 3 The plate of ceramic functionally graded material, the thickness of each layer of powder laying is 0.03mm, wherein the first layer of laying NiCrAlY powder, the second layer of laying contains 95 (wt)% NiCrAlY powder and 5 (wt)% Al 2 o 3 Mixed powder of powder, the third layer laying contains 90(wt)% NiCrAlY powder and 10(wt)% Al 2 o 3 Mixed powder of powder, the third layer laying contains 85(wt)% NiCrAlY powder and 15(wt)% Al 2 o 3 powder mixed powder, and so on, the last layer laying Al 2 o 3 Powder, the speed of laser printing is 1m / s, the laser power is 20000W / cm2, and the diameter of the printing laser is 0.1mm. When printing the first layer, 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 printing the thi...

Embodiment 3

[0048] Preparation of a NiCrAlY-Al with a 42-layer structure 2 o 3For the plate of ceramic functionally graded material, the thickness of each layer of powder laying is 0.02mm, wherein the first layer is laying NiCrAlY powder, and the second layer is laying containing 97.5 (wt)% NiCrAlY powder and 2.5 (wt)% Al 2 o 3 Mixed powder of powder, the third layer laying contains 95(wt)% NiCrAlY powder and 5(wt)% Al 2 o 3 Mixed powder of powder, the third laying layer contains 92.5(wt)% NiCrAlY powder and 7.5(wt)% Al 2 o 3 powder mixed powder, and so on, the last layer laying Al 2 o 3 Powder, the speed of laser printing is 2m / s, the laser power is 10000W / cm2, and the diameter of the printing laser is 0.1mm. When printing the first layer, 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, and the current of the second excitation coil is 7.975A. When...

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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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