Device for zone-melting directional solidification of laser leviation and directional solidification method

A laser suspension zone melting and directional solidification technology, applied in the field of material processing engineering, can solve the problems of high cost and complex structure, and achieve the effect of reducing size, uniform distribution and good orientation

Active Publication Date: 2011-05-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of complex structure and high cost in the prior art, the present invention prop

Method used

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  • Device for zone-melting directional solidification of laser leviation and directional solidification method
  • Device for zone-melting directional solidification of laser leviation and directional solidification method
  • Device for zone-melting directional solidification of laser leviation and directional solidification method

Examples

Experimental program
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Example Embodiment

[0030] Example one

[0031] This embodiment is a device for directional solidification of the laser suspension zone, which includes a laser 1, a beam splitter 2, a mirror, two convex lenses 6, two flat lenses 8, and a convex lens translation device 7, a vacuum chamber 9, and a drawing rotation System 10 and two motor groups 11. In this embodiment, the three plane mirrors include a first mirror 3, a second mirror 4, and a third mirror 5, and the beam splitter 2, the first mirror 3, the second mirror 4, and the third mirror 5 are sequentially distributed on the outer periphery of the vacuum chamber 9. The laser 1 is located on the side of the vacuum chamber 9. Two circular flat lenses 8 are respectively embedded on the housings on both sides of the vacuum chamber 9; the center axis of the flat lens 8 passes through the axis of the drawing rotation system 10 and is perpendicular to the axis of the drawing rotation system 10, so that it passes through two The two laser beams focus...

Example Embodiment

[0038] Example two

[0039] This embodiment is a method for Al 2 O 3 / YAG oxide eutectic laser suspension zone melting and directional solidification method, the specific process includes the following steps:

[0040] The first step is to make a preform; add Al 2 O 3 And Y 2 O 3 Two powders with a purity of 4N are in accordance with Al 2 O 3 / YAG eutectic components are mixed and put into a mortar, 10% PVA binder is added, the powder is mixed and ground to no agglomerated lumps by conventional methods; put 10 grams of the mixed powder into the cavity size In the 68×10mm mold, the clamping pressure is 25MPa, and the pressure is maintained for 5 minutes. The powder is pressed into 68×10×5mm plates to form a preform blank; the pressed preform blank is sintered in the atmosphere In order to increase the strength of the preform, the required sintering temperature and sintering time are determined by different materials. In this embodiment, the sintering temperature is 1400° C., the temp...

Example Embodiment

[0042] Example three

[0043] This embodiment is a method for directional solidification of laser suspension zone melting for oxide ternary hypereutectic. The specific implementation process of this embodiment includes the following steps:

[0044] The first step is to make a preform; add Al 2 O 3 , Y 2 O 3 And ZrO 2 Three powders with a purity of 4N were mixed according to a molar percentage of 64.6:15.3:20.1 and put into a mortar, added 10% of PVA binder, mixed the powders by conventional methods and ground them until there were no agglomerated lumps; The mixed powder is put into a mold with an inner cavity size of 68×10mm, the mold is closed and pressurized at 20MPa, and the pressure is maintained for 7 minutes. The powder is pressed into a plate of 68×10×5mm to form a preform blank; The pressed preform blank is sintered to increase the strength of the preform. The required sintering temperature and sintering time are determined by different materials. In this embodiment, the s...

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Abstract

The invention relates to a device for zone-melting directional solidification of laser leviation and a directional solidification method. The device adopts the structure that a laser is positioned on one side of a vacuum chamber; a beam splitter mirror and three reflecting mirrors are sequentially distributed outside the vacuum chamber; two round plate lenses are embedded on the vacuum chamber on the casing on two sides; and the central axis of the plate lenses passes and perpendicular to the axis of a draw rotation system, so that two laser beams sent to two convex lenses and passing the reflecting mirrors fall on the axis of the draw rotation system after passing plate lenses to enter into the vacuum chamber, further performing zone-melting to a precast body and realizing directional solidification through controlling laser power and rotational speed and draw rate of the draw rotation system. The invention is used in zone-melting directional solidification of laser leviation of high melting point alloy, and has the advantages that the obtained eutectic structure is finer, the size of the bulk silicide is smaller, the structure is more regular and more uniformly distributed, and has higher directing property.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to a device for melting and directional solidification in a laser levitation zone and a directional solidification method. Background technique [0002] Various methods of zone melting directional solidification using high-energy beams have been highly valued by many foreign scholars because of their high melting temperature, high temperature gradient, high control precision of solidification rate, wide adaptability to materials and environments, and no pollution. The flat temperature field at the front of the solid-liquid interface in the process of zone melting and directional solidification is a prerequisite for obtaining a uniform structure. Otherwise, the structure and mechanical properties of the obtained preform will appear inconsistency in a large range at the macro level, which will affect the analysis of experimental results and the application of materials. ...

Claims

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Application Information

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IPC IPC(8): C30B11/00C30B28/06B22D27/04
Inventor 张军刘林宋衎苏海军傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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