Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis

A thermal analysis, subcooling technology, applied in the investigation phase/state change and other directions, can solve problems such as inability to test subcooling

Inactive Publication Date: 2009-05-13
SHANGHAI UNIV
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Problems solved by technology

However, due to the limitations of the equipment itself, its maximum cooling rate often can only reach a cooling capacity of hundreds of K per minute, so it is impossible to test the supercooling degree of the rapid solidification process

Method used

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  • Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis
  • Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis
  • Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis

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Embodiment 1

[0019] In this embodiment, Sn-3.0Ag-0.5Cu (wt.%), a typical lead-free solder alloy, is selected as the single metal droplet material.

[0020] The concrete processing steps of the present embodiment are as follows:

[0021] (1) Select the required single metal solidification droplet under the optical microscope, and place it in the heating area of ​​the sensor of the rapid thermal analysis device;

[0022] (2) After the droplet is positioned, use an optical microscope for magnified observation to ensure that the position of the droplet is precisely controlled, located above the center of the sensor heating area, and determine the size of a single droplet, which is 47 μm in size, see appendix figure 1;

[0023] (3) Use rapid thermal analysis equipment to measure the heating and cooling curves of the above-mentioned single metal droplet in real time, and the heating and cooling rates are respectively selected as 1, 1×10 2 , 5×10 2 , 1×10 3 , 2×10 3 , 3×10 3 , 5×10 3 and ...

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Abstract

The invention relates to a method for mensurating supercooling degree by single metallic microsphere high cooling speed in-situ fast thermal analysis and belongs to the technical field of physical performance test and measurement. The method is characterized in that real-time in-situ fast thermal analysis test is carried out on the single metallic microsphere at a high heating-cooling speed, thereby directly obtaining the solidification supercooling degree of the metallic microsphere under the condition of high cooling speed by experimental means; and the method is different from the existing method which only can obtain the solidification supercooling degree of microsphere under the fast cooling condition by theoretical calculation. The invention uses a fast thermal analyzing device to measure the heating and cooling curves of the single metallic microsphere at real time; the heating-cooling speed is 1 to 1*10<4>K/s; the obtained heating and cooling curves are analyzed to obtain the melting and solidifying temperatures of the single metallic microsphere; and the real-time solidification supercooling degree of the single metallic microsphere can be obtained.

Description

technical field [0001] The invention relates to a method for measuring the degree of supercooling by in-situ rapid thermal analysis of a single metal droplet with a large cooling rate and belongs to the technical field of metal physical performance testing and measurement. Background technique [0002] Undercooling is an important characterization parameter of the metal solidification process. By properly controlling the solidification undercooling of the metal melt, different forms of solidification structures and different material properties can be obtained. Therefore, how to evaluate and characterize the degree of undercooling in the metal solidification process is the key. In order to fully understand the factors affecting the degree of undercooling in the process of metal solidification and its influence on the solidification structure, researchers have carried out extensive research. Because metals are opaque materials and are heated at high temperatures, characteriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02
Inventor 高玉来杨斌邹长东翟启杰克里斯托夫·什克艾乌基尼·朱拉夫列夫
Owner SHANGHAI UNIV
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