ZrC (Zirconium Carbide) ceramic precursor, ZrC ceramic and preparation method thereof

A ceramic precursor and ceramic technology, applied in the field of ceramics, can solve the problems of low yield of ZrC ceramics, inability to store for a long time, poor operability, etc., and achieve the effects of fine grains, complete mutual dissolution and good crystallinity

Inactive Publication Date: 2013-01-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a ZrC ceramic precursor, the preparation method of ZrC ceramics and ZrC ceramics made by it, to solve the poor operability of the ZrC ceramic prec

Method used

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  • ZrC (Zirconium Carbide) ceramic precursor, ZrC ceramic and preparation method thereof
  • ZrC (Zirconium Carbide) ceramic precursor, ZrC ceramic and preparation method thereof
  • ZrC (Zirconium Carbide) ceramic precursor, ZrC ceramic and preparation method thereof

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Example Embodiment

[0037] Another aspect of the present invention also provides a method for preparing the aforementioned ZrC ceramic, including the following steps:

[0038] 1. Cross-linking the aforementioned ZrC ceramic precursor solution at a cross-linking reaction temperature of 100-250°C for 0.5-4 hours to obtain a cross-linked ZrC ceramic precursor;

[0039] 2. The cross-linked ZrC ceramic precursor is subjected to a cracking reaction at a cracking reaction temperature of 1400 to 1600°C for 0.5 to 2 hours under an inert atmosphere or a vacuum condition to obtain ZrC ceramics.

[0040] The preparation method of ZrC ceramic provided by the present invention, because the zirconium source and the bidentate ligand form a coordinated intermediate, the mutual dissolution with the carbon source is more thorough, the combination is tighter, and the energy loss during the combination process between the carbon source and the zirconium source is reduced , The cracking reaction temperature is lower, and the...

Example Embodiment

[0045] Example 1

[0046] a) ZrOCl with a molar ratio of 1:1:2:9 2 ·8H 2 O, phenolic resin, acetylacetone and absolute ethanol are placed in a container and stirred evenly to obtain a ZrC ceramic precursor;

[0047] b) Keep the ZrC ceramic precursor at 100°C for 2 hours to obtain a cross-linked precursor gel;

[0048] c) Put the precursor gel into the mold, put it into the high-temperature cracking furnace, heat it up to 1400°C and keep it for 2 hours, then take it out to obtain the ZrC ceramic.

Example Embodiment

[0049] Example 2

[0050] a) ZrOCl with a molar ratio of 1:3:1:2 2 ·8H 2 O. Phenolic resin, ethylene glycol and absolute ethanol are placed in the container and stirred evenly to obtain the ZrC ceramic precursor;

[0051] b) Keep the ZrC ceramic precursor at 250°C for 0.5 hours to obtain a crosslinked precursor gel;

[0052] c) Put the precursor gel into a mold, put it into a high-temperature cracking furnace, heat it up to 1600°C, keep it for 0.5 hours, and take it out to obtain ZrC ceramics.

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Abstract

The invention provides a ZrC (Zirconium Carbide) ceramic precursor, a ZrC ceramic and a preparation method thereof. The ZrC ceramic precursor comprises a zirconium source, a carbon source, a bidentate ligand and a solvent, and the molar ratio of the zirconium source to the carbon source to the bidentate ligand to the solvent is 1: (1-3): (1-2): (2-9). The invention solves the technical problems that the ZrC ceramic precursor in the prior art is bad in process operability, is easy in gelation or precipitation after being placed for a long term or being heated, and can not be stored for a long time, the productive rate of the ZrC ceramic is low, and the purity is not high.

Description

technical field [0001] The present invention relates to the field of ceramics, in particular to a ZrC ceramic precursor solution. Another aspect of the present invention also provides ZrC ceramics prepared from the aforementioned ZrC ceramic precursor solution and a method for preparing ZrC ceramics. Background technique [0002] Hypersonic vehicles such as space shuttles, hypersonic missiles, and reusable vehicles have gradually become the main development direction of aerospace and weapon systems with high speed and high reliability, and will play an important role in future national security and development. Ultra-high temperature resistant ceramics and their composite materials have become one of the most promising candidate materials for the preparation of hypersonic aircraft structures due to their good thermal shock resistance and excellent ablation resistance. Ultra-high temperature resistant ceramic matrix mainly includes carbides and borides of refractory metals su...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
Inventor 刘荣军严春雷张长瑞曹英斌王思青李斌
Owner NAT UNIV OF DEFENSE TECH
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