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An electromagnetic-assisted laser printing nicraly-al 2 o 3 Ceramic method and apparatus

An auxiliary laser and laser printing technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems of unstable workpiece structure, deterioration of structural strength of components, and deterioration of appearance, so as to overcome low structural strength, good structural performance, and ensure The effect of molding quality

Active Publication Date: 2022-08-02
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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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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  • An electromagnetic-assisted laser printing nicraly-al <sub>2</sub> o <sub>3</sub> Ceramic method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of a NiCrAlY-Al with 12-layer Structure 2 O 3 The plate of ceramic functionally graded material, the thickness of each layer of powder is 0.05mm, wherein the first layer is laid with NiCrAlY powder, and the second layer is laid with 90 (wt)% NiCrAlY powder and 10 (wt)% Al 2 O 3 Mixed powder of powders, the third lay-up contains 80(wt)% NiCrAlY powder and 20(wt)% Al 2 O 3 Mixed powder of powders, the third lay-up contains 70 (wt) % NiCrAlY powder and 30 (wt) % Al 2 O 3 Mixed powder of powder, and so on, the last layer is laid with 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, the current of the second excitation coil is 7.9A, when printing the third layer,...

Embodiment 2

[0046] Preparation of a NiCrAlY-Al with 22-layer Structure 2 O 3 The plate of ceramic functionally graded material, the thickness of each layer of powder is 0.03mm, wherein the first layer is laid with NiCrAlY powder, and the second layer is laid with 95 (wt)% NiCrAlY powder and 5 (wt)% Al 2 O 3 Mixed powder of powders, the third lay-up contains 90(wt)% NiCrAlY powder and 10(wt)% Al 2 O 3 Mixed powder of powders, the third layup contains 85(wt)% NiCrAlY powder and 15(wt)% Al 2 O 3 Mixed powder of powder, and so on, the last layer is laid with Al 2 O 3 Powder, the speed of laser printing is 1m / s, the laser power is 20000W / cm2, the diameter of the printing laser is 0.1mm, when printing the first layer, the current of the first excitation coil is 6A, 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 third layer, the curr...

Embodiment 3

[0048] Preparation of a NiCrAlY-Al with 42-layer Structure 2 O 3The plate of ceramic functionally graded material, the thickness of each powder layer is 0.02mm, wherein the first layer is laid with NiCrAlY powder, and the second layer is laid with 97.5 (wt) % NiCrAlY powder and 2.5 (wt) % Al 2 O 3 Mixed powder of powders, the third layup contains 95(wt)% NiCrAlY powder and 5(wt)% Al 2 O 3 Mixed powder of powders, the third layup contains 92.5 (wt) % NiCrAlY powder and 7.5 (wt) % Al 2 O 3 Mixed powder of powder, and so on, the last layer is laid with Al 2 O 3 Powder, the speed of laser printing is 2m / s, the laser power is 10000W / cm2, the diameter of the printing laser is 0.1mm, when printing the first layer, the current of the first excitation coil is 6A, 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 printing the third layer,...

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Abstract

The invention discloses an electromagnetic-assisted laser printing NiCrAlY-Al 2 O 3 A ceramic method and device, the device includes a working cylinder, two first excitation coils, a laser head and a galvanometer, the two first excitation coils are respectively fixed and installed on both sides of the forming area of ​​the working cylinder, the two first excitation coils are respectively The magnetic line of induction formed between them covers the entire forming area of ​​the working cylinder. The laser head and the galvanometer mirror are installed above the working cylinder. The laser head emits laser light after being reflected by the galvanometer mirror and then shoots into the forming area of ​​the working cylinder. Additive printing is carried out by means of powder coating laser printing, and the convection of the metal solution in the molten pool is suppressed by the excitation coil, thereby improving the mechanical properties of the functionally graded material.

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 Method and device for ceramics, more particularly, to an electromagnetic-assisted laser printing NiCrAlY-Al 2 O 3 Methods and apparatus 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, 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 the sudden change of composition or stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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