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Preparation method and application of carbide ceramic precursor

A ceramic precursor and carbide technology, which is applied in the field of ultra-high temperature ceramics, can solve the problems of humidity sensitivity, low product purity, and high preparation temperature, and achieve the effect of easy composition, high purity, and low preparation temperature

Inactive Publication Date: 2014-09-03
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To solve the problems in the prior art that the ultra-high temperature ceramic precursor is sensitive to humidity, the product purity is not high, and the preparation temperature is too high

Method used

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  • Preparation method and application of carbide ceramic precursor
  • Preparation method and application of carbide ceramic precursor
  • Preparation method and application of carbide ceramic precursor

Examples

Experimental program
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Effect test

Embodiment 1

[0039] a) ZrCl with a molar ratio of 0.5:0.5:5:0:50 4 , HfCl 4 , Tartaric acid, ethylene glycol and distilled water are added to a beaker, placed on a magnetic stirrer, heated to about 60 ℃ and stirred until the reactants are dissolved, to obtain zirconium, hafnium ternary carbide solid solution ceramic precursor;

[0040] b) Heating the zirconium and hafnium ternary carbide solid solution ceramic precursors at 60°C for 40 hours to obtain the crosslinked product;

[0041] c) Put the cross-linked product in an alumina crucible, put it into a high-temperature cracking furnace, heat it up to 1300°C at 7°C / min in an argon atmosphere, keep it for 5 hours, and take out the zirconium and hafnium ternary carbide solid solution ceramics.

Embodiment 2

[0043] a) ZrOCl with a molar ratio of 1:0:8:500 2 ·8H 2 O, tartaric acid, glycerol and solvent distilled water are added to the beaker, placed on a magnetic stirrer and stirred to dissolve, after the dissolution is completed, the ZrC ceramic precursor is obtained;

[0044] b) Heating the ZrC ceramic precursor at 200°C for 5 hours to obtain a cross-linked product;

[0045] c) Put the cross-linked product in an alumina crucible, put it into a high-temperature cracking furnace, heat it up to 1600°C at 6°C / min in an argon atmosphere, hold it for 0.5h, and take out the ZrC ceramic.

Embodiment 3

[0047] a) HfCl with a molar ratio of 1:1:1:200 4 , Malic acid, glycerol and solvent distilled water are added to a beaker, placed on a magnetic stirrer and stirred to dissolve, after the dissolution is completed, the HfC ceramic precursor is obtained;

[0048] b) Heating the HfC ceramic precursor at 100°C for 10 hours to obtain a crosslinked product;

[0049] c) Put the cross-linked product in an alumina crucible, put it into a high-temperature cracking furnace, heat it up to 1400°C at 6°C / min in an argon atmosphere, vacuum and keep it for 2h, and take out the HfC ceramic.

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Abstract

The invention provides a preparation method and application of a zirconium (Zr) or hafnium (Hf) carbide ultrahigh-temperature ceramic liquid-phase precursor. The method comprises the following steps: by using a water-soluble zirconium (Zr) or hafnium (Hf) inorganic salt as a metal element source in the corresponding ceramic, a water-soluble hydroxycarboxylic acid / water-soluble polyalcohol mixture as a carbon source and distilled water as a solvent, preparing the carbide ceramic precursor, and crosslinking and cracking to prepare the corresponding carbide ceramic powder. The ceramic precursor provided by the invention has the advantages of low cost, low toxicity, environmental protection, simple preparation process, high stability in air, and can be stored for a long time. The prepared carbide ceramic powder has the advantages of higher purity, favorable crystallinity and small particle size. The precursor preparation method is hopeful to be applied in the aspects of synthesis and preparation of an ultrahigh-temperature ceramic precursor, preparation of ceramic fibers and composite materials by precursor conversion, preparation of ultrafine ultrahigh-temperature ceramic powder, and the like.

Description

Technical field [0001] The invention relates to the field of ultra-high temperature ceramics, in particular to a preparation method of a carbide ceramic precursor and its application in preparing high-temperature ceramic materials. Background technique [0002] Hypersonic aircraft has gradually become the main development direction of aerospace and weapon systems with high speed and rapid response capabilities, and will play an important role in future national security. The aerodynamic heating phenomenon of the nose cone and the leading edge of the wing is very prominent, and the development and application of new thermal protection materials are urgently needed. Ultra-high temperature resistant ceramics and their composite materials are considered to be the most promising material systems for thermal protection systems for ultra-high sonic aircraft. Ultra-high temperature ceramics refer to ceramic materials with a melting point higher than 3000°C, mainly including carbides and...

Claims

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Application Information

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IPC IPC(8): C04B35/56
Inventor 严春雷刘荣军曹英斌张长瑞李斌王思青
Owner NAT UNIV OF DEFENSE TECH
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