Diffusion sample preparation method for measuring metal melt diffusion by screw push type shearing unit method

Abstract

The invention discloses a diffusion sample preparation method for measuring metal melt diffusion by a screw push type shearing unit method. The device comprises a vacuum cavity, wherein a diffusion table is arranged in the vacuum cavity, the diffusion table comprises a base and a diffusion assembly arranged in a cavity of the base, the diffusion assembly is formed by laminating a plurality of ceramic sheets layer by layer, and the diffusion assembly comprises a group of fixed ceramic sheets which are fixedly arranged, a group of movable ceramic sheets which can move rightwards and a group of welding ceramic sheets which can move leftwards and rightwards; the welding ceramic sheet group is located in the middle of the diffusion assembly and located above and below the welding ceramic sheetgroup, and the fixed ceramic sheets and the movable ceramic sheets are arranged at intervals one by one; by pushing each movable ceramic sheet and each fusion welding ceramic sheet to move left and right, butt joint diffusion and slitting of samples are realized. Compared with the prior art, the method has the advantages that the diffusion quality is guaranteed, and the precision of a diffusion test is improved.

Description

technical field [0001] The invention relates to the technical field of metal melt diffusion, in particular to a method for preparing a diffusion sample for measuring the diffusion of a metal melt by a screw-propelled shear unit method, which is used for binary or multi-element alloys or other non-metallic materials in a molten state. Measurement of the lower interdiffusion coefficient. Background technique [0002] In liquid metals, the diffusion coefficient is an important physical parameter to describe the phenomenon of metal atomic mass transport. On the one hand, the diffusion behavior is closely related to the dynamic characteristics and microstructure of the liquid. On the other hand, in the solidification process, the diffusion behavior of atoms is an Key factor for coagulation of tissue. In the research of some alloy systems, it is also found that the change of the diffusion coefficient during the cooling process of the melt can directly change the composition distr...

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Problems solved by technology

However, there are still many problems in the actual use of this method: the graphite sheet used in the diffusion table is prone to react with some component samples at high temperature, thereby contaminating the sample and affecting the experimental results; when a layer of fused graphite sheet is used, it is easy to produce Holes; the temperature of the furnace wall is too high and it is impossible to prepare to judge whether the sample is completely docked, etc. These problems will affect the accuracy of the experimental data

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