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SPS fusion casting preparation method of aerial high-temperature composite material Nb/Nb5Si3

A composite material and high-temperature technology, which is applied in the field of SPS melting and casting preparation of aviation high-temperature composite material Nb/Nb5Si3, can solve the problems of long production cycle, complicated process, high energy consumption, etc., and achieve the effect of rapid response, simple process and uniform structure

Inactive Publication Date: 2009-12-23
陈哲
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Problems solved by technology

[0004] However, the above preparation of Nb / Nb 5 Si 3 The method of composite materials generally has the disadvantages of complex process, high energy consumption, and long production cycle.

Method used

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  • SPS fusion casting preparation method of aerial high-temperature composite material Nb/Nb5Si3
  • SPS fusion casting preparation method of aerial high-temperature composite material Nb/Nb5Si3
  • SPS fusion casting preparation method of aerial high-temperature composite material Nb/Nb5Si3

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Experimental program
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Embodiment 1

[0023] The raw materials used in the experiment were high-purity Si powder (200 mesh, 99.0%) produced by Shanghai Chemical Reagent Company, and high-purity Nb powder (-325 mesh, 99.9%) produced by Ningxia Dongfang Tantalum Industry Co., Ltd.

[0024] The Nb powder and Si are proportioned according to the molar ratio of Nb-16% Si. The raw materials were then mixed in a blender for 8h. The mixed powder is put into a tower-shaped graphite mold, and placed in a Japanese-made SPS-1050 discharge plasma device for SPS melting and casting synthesis reaction.

[0025] The DC pulse current of the SPS-1050 device used is 5000A, the voltage is 15V, and the pulse cycle is set to 12ms on and 2ms off. The spark plasma sintering temperature parameter is 1800°C, sintering in a vacuum atmosphere, the temperature is raised at a heating rate of 150°C / min, and the reaction temperature and heating rate are controlled by infrared temperature measurement. The applied uniaxial pressure is 0.5KN, and ...

Embodiment 2

[0027] The initial raw materials Nb and Si powder are analytically pure, according to the stoichiometric ratio of Nb-12% Si, the above reagents are accurately weighed with an analytical balance.

[0028] Then the raw materials were mixed in the mixer for 10h. The mixed powder is put into a graphite mold, and placed in a SPS-1050 discharge plasma device for SPS melting and casting synthesis reaction.

[0029] The DC pulse current of the SPS-1050 device used is 5000A, the voltage is 15V, and the pulse cycle is set to 12ms on and 2ms off. The spark plasma sintering temperature parameter is 1800°C, sintering in a vacuum atmosphere, the temperature is raised at a heating rate of 150°C / min, and the reaction temperature and heating rate are controlled by infrared temperature measurement. The applied uniaxial pressure is 0.5KN, and the reaction synthesis and densification are carried out. integration. The field emission scanning electron image of the longitudinal section of the eute...

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Abstract

The invention relates to an SPS fusion casting preparation method of aerial high-temperature composite material Nb / Nb5Si3, which belongs to the field of composite material. The method comprises the following steps: Nb powder and Si powder are combined respectively according to the mol ratios of 5:1, 6:1, 7:1, 8:1 and 9:1; the uniformly mixed powder is placed in a SPS device to perform SPS fusion casting synthetic reaction; and Nb / Nb5Si3 in situ composite material with approximate theoretical density is obtained. The method is characterized in that the technology is simple, the reaction is rapid, the tissue of the prepared material composite material is uniform and dense, and the preparation method integrates the in situ reaction synthesis and the liquid formation process of the material into a whole, therefore, the integration of the synthesis and the liquid formation of the material is realized. The method has the advantages of speediness, high efficiency, energy saving, environmental protection and the like, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to an aviation high temperature composite material Nb / Nb 5 Si 3 The invention discloses a preparation method of SPS melting and casting, which belongs to the field of composite materials. Background technique [0002] With the rapid development of aerospace and other technologies, the engine is required to have a higher thrust-to-weight ratio and work efficiency, which requires the engine to have a higher operating temperature. For example: scientists are developing the sixth-generation engine with a thrust-to-weight ratio as high as 20:1, and its working temperature is required to be as high as 1600°C. However, the operating temperature of the nickel-based superalloys commonly used in jet engines cannot exceed 1100 °C, and is approaching its service limit. Nb / Nb 5 Si 3 It is a new type of high-temperature structural composite material. It is considered to be the most suitable material due to its high melting point, low densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/18
Inventor 陈哲严有为彭顺隽利伟刘德辉
Owner 陈哲
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