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Preparation method of metal melt diffusion sample

A metal melt and sample technology, which is applied to the preparation of metal melt diffusion samples, can solve problems such as large differences, and achieve the effects of removing systematic errors, accurate and reasonable diffusion coefficient measurement, and reducing residual temperature diffusion time.

Active Publication Date: 2012-08-01
HEFEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example, the diffusion coefficient of the same system measured by different methods is often very different, and some differences even exceed 1 times.

Method used

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  • Preparation method of metal melt diffusion sample
  • Preparation method of metal melt diffusion sample
  • Preparation method of metal melt diffusion sample

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] The structural form of the molten metal diffusion equipment in this embodiment is:

[0029] see figure 1 , figure 2 , a frame 2 is set in the vacuum chamber 1, and a diffusion table made of graphite is fixedly arranged in the frame 2; the diffusion table is a vertically fixed columnar body; a heating device 3 is arranged on the periphery of the diffusion table; The platform is a component, including:

[0030] Such as figure 2 , Figure 3a and Figure 3b As shown, a fixed base 4 is set, and a fixed sample column 5 is arranged in the center of the fixed base 4 along the axial direction. The top surface of the base 4 is flush, and fixed splints 6 are respectively arranged on both sides of the diffusion table; the fixed base 4, the fixed sample column 5, the sliding block 7 and the fixed top plate 8 are clamped front and rear by the fixed splints 6; A slot for positioning the heating device 3 is provided on the top for heating, and a small hole leading to the fixed ...

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Abstract

The invention discloses a preparation method of a metal melt diffusion sample. The preparation method is characterized in that a vacuum cavity is internally provided with a framework, wherein a diffusion platform made from graphite is fixed in the framework; the diffusion platform is a cylinder body vertically fixed; a heating device is arranged on the periphery of the diffusion platform; the diffusion platform is an assembly and comprises a fixed base, a slide block and a top plate; and a vacuum port and a cooling gas introducing port for introducing cooling gas are respectively arranged on the side wall of the vacuum cavity. According to the preparation method of the metal melt diffusion sample, disclosed by the invention, the cutting of a metal liquid in a sample cylinder cavity is realized by two different work stations between the slide block and the fixed base; and oxidized skin generated by slight oxidization of the surface of the material is removed by cutting; meanwhile, the system error of the diffusion phenomenon in a temperature-rising process is further removed and the residual temperature diffusion time is greatly reduced in a temperature-reducing process, so that the subsequent measurement of diffusion coefficient of the diffusion sample is more precise and more reasonable.

Description

technical field [0001] The invention relates to a method for preparing a metal melt diffusion sample, which is suitable for measuring the interdiffusion coefficient of binary or multi-element alloys or other non-metallic materials in a molten state. Background technique [0002] A lot of research has been done on the liquid diffusion at room temperature, such as the diffusion of copper sulfate solution in water. However, due to the limitation of technical conditions, there is no better diffusion equipment for high-temperature molten metal alloy melts so far. [0003] The diffusion behavior of metal melt plays an important role in the solidification process of the melt, and is a key kinetic parameter affecting the crystal nucleation and growth process. In the research of some alloy systems, it is found that changing the diffusion coefficient of the melt can directly change the composition distribution and microscopic morphology of the solidified structure. Therefore, the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N13/00
Inventor 张博耿永亮朱纯傲
Owner HEFEI UNIV OF TECH
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