Method and device for directionally solidifying liquid/solid interface based on ultrasonic wave modulation

A technology of directional solidification and liquid-solid interface, which is applied in self-solidification, chemical instruments and methods, crystal growth, etc., can solve the problem of increasing energy consumption and manufacturing costs, reducing the mechanical properties and physical properties of single crystals, and reducing product qualification rates, etc. question

Inactive Publication Date: 2012-02-22
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The convex or concave liquid-solid interface in the semiconductor crystal will form segregation. These defects greatly reduce the mechanical properties and physical properties of the single crystal, and even produce waste products, so the product qualification rate is reduced, and energy consumption and manufacturing costs are increased.

Method used

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  • Method and device for directionally solidifying liquid/solid interface based on ultrasonic wave modulation
  • Method and device for directionally solidifying liquid/solid interface based on ultrasonic wave modulation
  • Method and device for directionally solidifying liquid/solid interface based on ultrasonic wave modulation

Examples

Experimental program
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Effect test

Embodiment 1

[0018] This method is based on ultrasonic modulation of directional solidification liquid-solid interface, characterized in that: add a group of ultrasonic waves near the liquid-solid interface on the periphery of the crystallizer, use the ultrasonic acoustic flow phenomenon to stir the liquid phase; control the ultrasonic acoustic flow by changing the ultrasonic frequency and power Stirring intensity of the liquid phase, and then realize the modulation of the shape of the directional solidification liquid-solid interface.

Embodiment 2

[0020] This experimental example is basically the same as the experimental example 1. The special feature is that ultrasonic stirring stirs the liquid phase within a small scale at the front of the liquid-solid interface, does not affect the longitudinal temperature gradient of directional solidification, and eliminates the radial temperature difference and concentration difference. Thus, a flat liquid-solid interface shape is obtained. The size of the acoustic flow generated by ultrasonic waves is related to the power and frequency of the ultrasonic waves. ,in, U is the maximum possible velocity of the acoustic flow, f is the ultrasonic frequency, A is the maximum amplitude of the end face of the horn. In addition, the sound pressure amplitude generated by ultrasonic waves in the liquid phase P It is lower than the ultrasonic cavitation threshold of the liquid phase, avoiding the adverse effects of cavitation on directional solidified tissue; the sound pressure amplitude...

Embodiment 3

[0022] The device based on ultrasonic wave modulation directional solidification interface is used in the above method, including a furnace body (2), which is characterized in that a heat insulation layer structure (12) is slid and inserted in the middle of the inner cavity of the furnace body (2). The root tube-shaped corundum crucible (9), while the heat insulation layer structure (12) separates the inner cavity of the furnace body (2) into upper and lower furnace chambers; The inner cavity of the upper section of the tubular corundum crucible (9) stores the liquid phase sample (10), and the periphery is equipped with a graphite auxiliary heating body (4) and a graphite tube main heating body (1). There is a boron carbide cover (8) on the top of the heating body (1); multiple ultrasonic transmitting probes (5) are evenly installed in the axial direction in the heat insulation layer structure (12), and all ultrasonic transmitting probes (5) are externally connected to ultr...

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Abstract

The invention provides a method and device for directionally solidifying a liquid/solid interface based on ultrasonic wave modulation. In the method, a group of ultrasonic waves is added near a peripheral liquid/solid interface of a crystallizer; the ultrasonic waves spread in a liquid phase to form a sound current; and the sound current forces the liquid phase to flow and stirs the liquid phase. The intensity of the sound current is related to the transmitting power and frequency of ultrasonic waves; and by modulating the transmitting power and frequency of the ultrasonic waves, a flat liquid/solid interface can be obtained. The device has the characteristics that a group of ultrasonic wave transmitting probes are added in a heat insulation layer at the lower end of a furnace, and the probes are externally connected with an ultrasonic signal source. By adjusting the applied ultrasonic waves to accurately control the melt to flow, the radial temperature and solute of the liquid/solid interface are re-distributed uniformly so as to ensure that the solidification material grows in a flat interface manner, the shortcomings are reduced, and the crystal quality and preparation efficiency are improved.

Description

technical field [0001] The invention relates to a directional solidification technology, which is a method and a device for modulating a directional solidification liquid-solid interface by ultrasonic wave, which is used for controlling the solidification mode of metal and belongs to the field of material preparation. Background technique [0002] Directional solidification refers to the application of technical means in the solidification process to establish a temperature gradient in a specific direction at the liquid-solid interface, so that the melt solidifies in the direction opposite to the heat flow, and finally obtains a directional solidified columnar structure or single crystal. Directional solidified columnar crystals and single crystals have excellent mechanical and physical properties. For example, directionally solidified columnar crystals and single crystal superalloys meet the continuous increase in the temperature before the combustion chamber turbine in aero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20C30B11/00C30B29/52
Inventor 任维丽鲁亮樊亚夫任忠鸣钟云波余建波
Owner SHANGHAI UNIV
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