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SiC/ZrC layered block composite material and preparation method thereof

A composite material and block technology, which is applied in the field of SiC/ZrC layered bulk composite material and its preparation, can solve the problems of poor uniformity of thin-layer ceramic green bodies, and achieve the expansion of rapid sintering preparation methods, excellent performance, and high density. high effect

Inactive Publication Date: 2021-06-08
XIAN AERONAUTICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the existing preparation technology, the purpose of the present invention is to provide a SiC / ZrC layer with simple process and low cost, which can not only solve the problems of poor uniformity of thin-layer ceramic green bodies, but also does not require subsequent lengthy debinding process. Shaped composite ceramic material and preparation method thereof, the method can realize rapid sintering of SiC / ZrC layered composite ceramic material, and the prepared material has high density and excellent performance

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  • SiC/ZrC layered block composite material and preparation method thereof
  • SiC/ZrC layered block composite material and preparation method thereof
  • SiC/ZrC layered block composite material and preparation method thereof

Examples

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Embodiment 1

[0055] S100, immerse the carbon film shown in Table 1 in a nitric acid solution with a volume concentration of 40% and vibrate ultrasonically for 1 hour, take it out, rinse it with alcohol, put it in a vacuum oven, and dry it at 120°C for 1 hour to obtain a pre- treated carbon film.

[0056] S200, converting some pretreated carbon films into SiC films by molten salt reaction, specifically comprising the following steps:

[0057] (1) by the particle diameter shown in table 1 and the mol ratio of carbon film and Si powder, take by weighing an appropriate amount of Si powder;

[0058] (2) by sodium chloride: the mass ratio of sodium fluoride=4:1, take the mixed powder of sodium chloride and sodium fluoride;

[0059] (3) According to the mass ratio of 1:10, pour the Si powder and the mixed powder into the mortar, grind and mix evenly to obtain the reaction powder;

[0060] (4) Embedding the carbon film in the reaction powder, and then putting it into the graphite crucible togeth...

Embodiment 2

[0077] The preparation method of above-mentioned a kind of SiC / ZrC layered bulk composite material, comprises the following steps:

[0078] S100, immerse the carbon film shown in Table 1 in a nitric acid solution with a volume concentration of 30% and vibrate ultrasonically for 0.5h, take it out, rinse it with alcohol, put it in a vacuum oven, and dry it at 110°C for 2h to obtain Pretreated carbon film.

[0079] S200, converting some pretreated carbon films into SiC films by molten salt reaction, specifically comprising the following steps:

[0080] (1) by the particle diameter shown in table 1 and the mol ratio of carbon film and Si powder, take by weighing an appropriate amount of Si powder;

[0081] (2) by sodium chloride: the mass ratio of sodium fluoride=4:1, take the mixed powder of sodium chloride and sodium fluoride;

[0082] (3) According to the mass ratio of 1:10, pour the Si powder and the mixed powder into the mortar, grind and mix evenly to obtain the reaction p...

Embodiment 3

[0094] The preparation method of above-mentioned a kind of SiC / ZrC layered bulk composite material, comprises the following steps:

[0095] S100, immerse the carbon film shown in Table 1 in a nitric acid solution with a volume concentration of 50% and vibrate ultrasonically for 2 hours, take it out, rinse it with alcohol, put it in a vacuum oven, and dry it at 130°C for 0.5 hour to obtain Pretreated carbon film.

[0096] S200, converting some pretreated carbon films into SiC films by molten salt reaction, specifically comprising the following steps:

[0097] (1) by the particle diameter shown in table 1 and the mol ratio of carbon film and Si powder, take by weighing an appropriate amount of Si powder;

[0098] (2) by sodium chloride: the mass ratio of sodium fluoride=4:1, take the mixed powder of sodium chloride and sodium fluoride;

[0099] (3) According to the mass ratio of 1:10, pour the Si powder and the mixed powder into the mortar, grind and mix evenly to obtain the r...

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Abstract

The invention relates to the field of ultrahigh-temperature ceramic materials, and discloses a SiC / ZrC layered block composite material and a preparation method thereof. The composite material is composed of SiC layers and ZrC layers which are alternately distributed and parallel to each other. The preparation method comprises the following five steps: (1) the carbon film is pretreated; (2) the carbon film is converted into the SiC film through a molten salt reaction; (3) the carbon film is converted into a ZrC film through the molten salt reaction; (4) the SiC film and the ZrC film arestacked layer by layer; and (5) the SiC / ZrC layered block composite material is subjected to spark plasma sintering. The method is simple in process and low in cost, rapid preparation of the SiC / ZrC layered block composite material can be achieved, and the prepared material is uniform in microstructure and high in density. In addition, the preparation method is also suitable for preparation of other carbide films and block composite materials, so that the preparation method of the carbide layered block composite material is greatly expanded.

Description

technical field [0001] The invention belongs to the field of ultra-high temperature ceramic materials, and in particular relates to a SiC / ZrC layered block composite material and a preparation method thereof. Background technique [0002] Zirconium carbide ceramics have the advantages of high melting point, high hardness, good chemical stability, good thermal conductivity, high elastic modulus, moderate thermal expansion coefficient, good thermal shock resistance and ablation resistance, etc., as an ultra-high temperature structure Materials have been widely used in heat-resistant materials and surface coatings of wear-resistant materials in ultra-high temperature environments, but the fatal weakness of high brittleness limits its application to a certain extent. [0003] In order to overcome the weakness of high brittleness of zirconium carbide ceramic materials, it must be toughened. An effective way is to use the strong interfacial residual stress toughening method of la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/575C04B35/622C04B35/645
CPCC04B35/5622C04B35/575C04B35/622C04B35/645C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/666C04B2235/661
Inventor 张阔于方丽张海鸿唐健江
Owner XIAN AERONAUTICAL UNIV