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Method and special device for growing large-size titanium alloy crystals through laser-assisted heating

A laser-assisted, titanium alloy technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of uneven heating, incomplete melting of the core, unstable floating melting area, etc., to achieve uniform heating, The effect of improving the solid-liquid interface, improving the seeding success rate and crystal quality

Pending Publication Date: 2019-12-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of uneven heating, incomplete melting of the core and instability of the suspended melting zone during the crystal growth of large-sized test rods (diameter>15mm), the present invention provides a method for growing large-sized titanium alloy crystals by laser-assisted heating And special equipment, through the design of the structure and function of the special equipment, a laser heating source with high precision and strong controllability is introduced into the central part of the suspension melting zone to form a composite heating method of surface xenon lamp heating and core laser heating, combined with Through the control of the process, the growth problem of large-sized test rod crystals is solved, so that crystals with a diameter ≥ 30mm can be grown to facilitate engineering applications

Method used

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  • Method and special device for growing large-size titanium alloy crystals through laser-assisted heating
  • Method and special device for growing large-size titanium alloy crystals through laser-assisted heating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of oriented TiNb crystals with a diameter of 30 mm:

[0051] Growth speed: 6mm / h, rotation speed of feeding rod 33: 10r / min, xenon lamp power 1.5kw (external heating), laser power 0.2kw (core heating), laser heating is introduced after the xenon lamp is turned on for 5 minutes, and laser heating The power is evenly adjusted from 0W to 0.2kw at a speed of 6W / min to realize the coordinated heating of the xenon lamp and the laser, and finally prepare a large-sized TiNb crystal with a diameter of 30mm.

Embodiment 2

[0053] Preparation of oriented TiAl crystals with a diameter of 33 mm:

[0054] Growth speed: 5mm / h, rotation speed of feeding rod 33: 9r / min, xenon lamp power 2.0kw (external heating), laser power 0.2kw (core heating), laser heating is introduced after the xenon lamp is turned on for 5 minutes, and laser heating The power was uniformly adjusted from 0W to 0.2kw at a speed of 6W / min to realize the coordinated heating of the xenon lamp and the laser, and finally a large-sized TiAl crystal with a diameter of 33mm was prepared.

Embodiment 3

[0056] Preparation of oriented TiAlNb crystals with a diameter of 30 mm:

[0057] Growth speed: 15mm / h, rotation speed of feeding rod 33: 12r / min, xenon lamp power 6.0kw (external heating), laser power 0.6kw (core heating), laser heating is introduced after the xenon lamp is turned on for 6 minutes, and laser heating The power was evenly adjusted from 0W to 0.6kw at a speed of 8W / min to realize the coordinated heating of the xenon lamp and the laser, and finally a large-sized TiAlNb crystal with a diameter of 30mm was prepared.

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Abstract

The invention aims to provide a method and special device for growing large-size titanium alloy crystals through laser-assisted heating. The device comprises a laser core heating device, a xenon lampsurface heating device, a base, a vacuum cavity and the like, and during preparation of the crystals, seeding growth is conducted by adopting a xenon lamp and laser collaborative heating mode. By designing the structure and function of the special device, a high-precision and high-controllability laser heating heat source is introduced into the central part of a suspending melting zone to form a surface xenon lamp heating and core laser heating composite heating mode, by combining control over the technological process, the problem of growth of the large-size titanium alloy test bar crystals is solved, thus the crystals with the diameter being up to 30 mm can be grown, and engineering application is achieved advantageously.

Description

technical field [0001] The invention relates to a preparation method of a titanium alloy crystal material, and in particular provides a method and special equipment for laser-assisted heating and growth of a large-size titanium alloy crystal. Background technique [0002] The optical floating zone furnace is a directional solidification furnace in a suspended melting zone that uses light heating. It has the characteristics of no crucible, high cleanliness, high temperature gradient and fast growth rate; it is widely used in the crystal growth of oxides and intermetallic compound materials such as TiAl Research, especially those crystalline materials with strong melt reactions and high melting points. [0003] The widely used optical floating zone furnaces are heated by 2 to 4 ellipsoidal reflectors to focus xenon lamps. The melt mainly depends on surface tension to maintain its shape and grows along the vertical direction. For example, the model produced by Japan CSC Company...

Claims

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Application Information

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IPC IPC(8): C30B13/22C30B29/52
CPCC30B13/22C30B29/52
Inventor 线全刚金浩张重远刘荣华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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