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Method for inhibiting growth of A element whiskers in MAX phase

An element and whisker technology, which is applied in the field of inhibiting the growth of A element whiskers in the MAX phase, can solve the problems of not fundamentally inhibiting the growth of whiskers, increasing costs, and cumbersome coating preparation processes, so as to inhibit the growth of A whiskers , low cost, and the effect of inhibiting whisker growth

Active Publication Date: 2022-05-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the MAX phase with excessive whisker growth, A whiskers can often "pierce" the protective coating, so this method cannot fundamentally inhibit the growth of whiskers, and the coating preparation process is cumbersome and increases the cost

Method used

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  • Method for inhibiting growth of A element whiskers in MAX phase
  • Method for inhibiting growth of A element whiskers in MAX phase
  • Method for inhibiting growth of A element whiskers in MAX phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A MAX Phase Solid Solution Ti with A-site Solid Solution Elements 3 (Sn 0.9 Al 0.1 )C 2 , where the MAX phase is Ti 3 SnC 2 , A' solid-solution atom is Al, and the concentration of A' solid-solution atom in A atomic layer is 10at%, and its preparation method is:

[0025] (1) Mix commercial Ti powder, Sn powder, Al powder, and graphite powder according to the molar ratio of Ti:Sn:Al:C=3:1:0.1:2, and then adopt the method of pressureless sintering at 1370°C Sintering for 2 hours under the protective gas of argon to obtain Ti 3 (Sn 0.9 Al 0.1 )C 2 Solid solution sintered powder;

[0026] (2) First, the MAX phase solid solution with A-site solid solution elements is pickled to remove impurities, and 10gTi 3 (Sn 0.9 Al 0.1 )C 2 Add it into 200ml of 1mol / L hydrochloric acid, and accelerate the reaction with the help of magnetic stirring. The magnetic stirring speed is 500r / min, the reaction temperature is 40°C, and the reaction time is 5h; phase, and the resulti...

Embodiment 2

[0032] A MAX Phase Solid Solution Ti with A-site Solid Solution Elements 2 (Sn 0.8 Al 0.2 )C, where the MAX phase is Ti 2 SnC, A' solid-solution atom is Al, and the concentration of A' solid-solution atom in A atomic layer is 20at%, and its preparation method is:

[0033] (1) Mix commercial Ti powder, Sn powder, Al powder, and TiC powder according to the molar ratio of Ti:Sn:Al:TiC=1:0.8:0.2:0.9, and then use pressureless sintering at 1400°C Sintering for 1h, the protective gas is argon, to obtain Ti 2 (Sn 0.8 Al 0.2 ) C solid solution sintered powder;

[0034] (2) First, the MAX phase solid solution with A-site solid solution elements is pickled to remove impurities, and 10gTi 2 (Sn 0.8 Al 0.2 )C is added to 200ml of 1mol / L hydrochloric acid, and the reaction is accelerated by means of magnetic stirring. The magnetic stirring speed is 500r / min, the reaction temperature is 40°C, and the reaction time is 5h; The liquid phase was removed, and the resulting Ti 3 (Sn 0...

Embodiment 3

[0039] A MAX Phase Solid Solution Ti with A-site Solid Solution Elements 2 (In 0.5 Al 0.5 )C, where the MAX phase is Ti 2 InC, A' solid-solution atoms are Al, and the concentration of A' solid-solution atoms in the A atomic layer is 50 at%, and its preparation method is:

[0040] (1) Mix commercial Ti powder, In powder, Al powder, and TiC powder according to the molar ratio of Ti:In:Al:TiC=1:0.5:0.5:0.9, and then use pressureless sintering at 1400°C Sintering for 1h, the protective gas is argon, to obtain Ti 2 (In 0.5 Al 0.5 ) C solid solution sintered powder;

[0041] (2) First, the MAX phase solid solution with A-site solid solution elements is pickled to remove impurities, and 10gTi 2 (In 0.5 Al 0.5 )C is added to 200ml of 1mol / L hydrochloric acid, and the reaction is accelerated by means of magnetic stirring. The magnetic stirring speed is 500r / min, the reaction temperature is 50°C, and the reaction time is 5h; The liquid phase was removed, and the resulting Ti ...

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Abstract

The invention discloses a method for inhibiting growth of A element whiskers in an MAX phase, which comprises the following steps: forming an element A 'by using an oxide film, and carrying out solution treatment on the A site in the MAX phase to obtain an MAX phase solid solution; and after the MAX phase solid solution is subjected to damage treatment, an oxidation film is formed on the surface of the MAX phase. After the MAX phase containing the A'element is damaged by mechanical friction, A 'atoms easily form a compact oxide film on the surface of the MAX phase to serve as a protective layer, diffusion of the A atoms to the surface of the MAX phase is hindered, and a substance source needed by growth of A whiskers is cut off; the method is suitable for inhibition of A whiskers of all MAX phases, the process is simple, the reliability is high, whisker growth of the MAX phases can be fundamentally inhibited, and meanwhile the mechanical property of the MAX phases can be improved.

Description

technical field [0001] The invention relates to a method for inhibiting the growth of whiskers in materials, in particular to a method for inhibiting the growth of A element whiskers in MAX phase. Background technique [0002] The MAX phase is a non-Van der Waals nano-layered carbide or nitride ceramic, in which M is a metal element of the former transition group, A is a group A element, X is carbon or nitrogen, and its structure is characterized by a single atomic layer of A element and m 6 The X octahedral sheets are stacked in a sandwich structure. The MAX phase combines the excellent properties of metals and ceramics, such as good wear resistance and thermal shock resistance, good electrical conductivity and thermal conductivity, and has potential applications in harsh service environments, such as in the field of electronic packaging High temperature semiconductor electrical contact materials. In this application scenario, surface oxidation caused by high temperature...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622C04B41/00
CPCC04B35/5611C04B35/622C04B41/009C04B2235/3817C04B2235/6567
Inventor 张培根田志华唐静雯孙正明刘健
Owner SOUTHEAST UNIV