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Preparation method of MoSi2@ZrO2 core-shell structure

A core-shell structure and calcination technology, which is applied in the field of MoSi2@ZrO2 core-shell structure preparation, achieves the effects of environmental friendliness, pure components, and reduced equipment requirements

Active Publication Date: 2020-12-15
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These disadvantages limit the application of MoSi2 as a high-temperature structure

Method used

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  • Preparation method of MoSi2@ZrO2 core-shell structure
  • Preparation method of MoSi2@ZrO2 core-shell structure

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Experimental program
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Embodiment 1

[0026] 2.5g MoSi after ball milling 2 Add powder and dispersant 1.6g / L SDS to a beaker containing 200ml distilled water for mechanical ultrasonic stirring, using water as the dispersion medium; after dispersing for 6 hours, add 1.5338g of zirconium source ZrOCl to the suspension 2 ·8H 2 O, calculated as 20% vol ZrO 2 . Add alkaline solution NH dropwise 3 ·H 2 0 to about PH=9. Continue to stir for 3h until the mixture is uniform. The prepared suspension was placed in a reaction kettle, heated to 200°C in an oven, the curing time was 24 hours, and the curing temperature was 200°C. After hydrothermal reaction synthesis, the compound powder is obtained by filtering with distilled water and alcohol, washing each three times, drying, and sieving with 200 mesh. The prepared powder was calcined in an atmosphere tube furnace for 3h, and the holding temperature was 380°C. Through the above steps, MoSi is obtained 2 @ZrO 2 Core-shell structure.

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Abstract

The invention discloses a preparation method of a MoSi2@ZrO2 core-shell structure. The method comprises the following steps: (1), adding MoSi2 powder and SDS into a beaker, carrying out mechanical ultrasonic stirring, and using water or alcohol as a dispersion medium; (2), after dispersing for a certain time, adding a zirconium source into a suspension, and dropwise adding an alkaline solution NH3.H2O or NaOH until the pH value is between 7 and 14; continuously performing stirring for a certain time until the materials are uniformly mixed; (3), placing the prepared suspension liquid in a reaction kettle, the curing time being 12-48 h, and the curing temperature being 160-220 DEG C; performing heating by using a drying oven, and keeping the temperature after the suspension liquid reaches acertain temperature at a certain heating rate; (4), after hydrothermal reaction synthesis, performing filtering, washing, drying and sieving to obtain powder; (5), calcining the prepared powder in calcining equipment for 1-6 hours, the heat preservation temperature being 300-400 DEG C; and (6), obtaining a MoSi2@ZrO2 core-shell structure through the steps, and the volume fraction of the synthesized ZrO2 powder being 10-30 vol%. A hydrothermal method is adopted, no pollution is caused, the requirement for equipment is lowered, and the method is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance ceramic matrix composite powder, in particular to a MoSi 2 @ZrO 2 Preparation method of core-shell structure. Background technique [0002] MoSi 2 With the advantages of high melting point (2303K), high strength and good thermal conductivity, it is a candidate material for the next generation of high-temperature materials. In particular, it is considered as a promising high-temperature coating for use in aerospace, nuclear industry, metallurgy, and electronics. MoSi 2 High temperature brittleness (BDTT at 900-1000°C), insufficient high-temperature strength above 1300°C, especially low creep resistance. And at around 400-600°C, MoSi 2 Accelerated oxidation occurs, and eventually the dense body becomes powder, which is called the Pest phenomenon. These disadvantages limit the MoSi 2 Application as a high temperature structure. Therefore, room temperature toughening a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/628
CPCC04B35/58092C04B35/62823
Inventor 张建军刘靠斌韦学龙梁炳亮陈卫华何文欧阳晟艾云龙
Owner NANCHANG HANGKONG UNIVERSITY
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