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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 proposes a device and a directional solidification method for melting and directional solidification in the laser levitation zone

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

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Embodiment 1

[0031]This embodiment is a device for melting and directional solidification of the laser suspension area, including a laser 1, a beam splitter 2, a reflector, two convex lenses 6, two flat lenses 8, a convex lens translation device 7, a vacuum chamber 9, and a pulling and rotating System 10 and two motor units 11 . In this embodiment, the three plane reflectors include the first reflector 3, the second reflector 4 and the third reflector 5, and the beam splitter 2, the first reflector 3, the second reflector 4 and the third reflector 5 are sequentially distributed on the outer periphery of the vacuum chamber 9 . The laser 1 is located on one side of the vacuum chamber 9 . Two circular flat lenses 8 are embedded respectively on the housings on both sides of the vacuum chamber 9; The two laser beams focused by the convex lens 6 enter the vacuum chamber 9 through the two flat lenses 8 and then fall on the axis of the drawing and rotating system 10 to realize the melting of the...

Embodiment 2

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

[0040] The first step is to make the prefabricated body; Al 2 o 3 and Y 2 o 3 Two powders with a purity of 4N according to 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 by conventional methods until there is no agglomerated lump; 10 grams of the mixed powder is put into the cavity with a size of In a 68×10mm mold, the mold is clamped and pressurized at 25MPa, and the pressure is kept for 5 minutes, and the powder is pressed into a 68×10×5mm plate to form a blank of the preform; the blank of the pressed preform is sintered in the atmosphere , in order to increase the strength of the prefabricated body, the required sintering temperature and sintering time are determined according to differen...

Embodiment 3

[0043] This embodiment is a method for melting and directional solidification in the laser levitation region of oxide ternary hypereutectic crystal. The specific implementation process of this embodiment includes the following steps,

[0044] The first step is to make the prefabricated body; Al 2 o 3 , Y 2 o 3 and ZrO 2 Three kinds of powders with a purity of 4N are mixed according to molar percentage 64.6: 15.3: 20.1 and put into a mortar, add 10% PVA binder, and the powders are mixed and ground to no agglomerated lumps by conventional methods; 10 g Put the mixed powder into a mold with an inner cavity size of 68×10mm, close the mold and pressurize at 20MPa, hold the pressure for 7 minutes, and press the powder into a plate of 68×10×5mm to form a prefabricated blank; Next, sinter the blank of the pressed prefabricated body to increase the strength of the prefabricated body. The required sintering temperature and sintering time are determined according to different materi...

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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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