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Ta-Zr-C ternary ceramic and preparation method thereof

A ternary ceramic, ta-zr-c technology, applied in the field of inorganic materials, can solve the problems of low conversion rate, impure product, large product particle size, etc., and achieve high reactivity, good crystallinity and complete crystal structure. Effect

Active Publication Date: 2015-07-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent document with the application number 200810031847.0 discloses a method for preparing tungsten carbide-titanium carbide-tantalum carbide solid solution powder by direct solid-state mixing of tungsten powder, titanium oxide, tantalum oxide and carbon black followed by carbothermal reduction. The resulting product has a large particle size, And the solid phase reaction process involved is prone to problems such as low conversion rate and impure product

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  • Ta-Zr-C ternary ceramic and preparation method thereof
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Embodiment 1

[0036] A Ta-Zr-C ternary ceramic of the present invention is a Ta-Zr-C continuous single-phase solid solution ceramic powder in which Zr atoms are dissolved in TaC, and the density is 10.44g / cm 3 , The particle size of the ceramic powder is less than 500nm, and the average particle size is 228.3nm.

[0037] A kind of preparation method of the Ta-Zr-C ternary ceramic of above-mentioned present embodiment, comprises the following steps:

[0038] (1) Preparation of precursor solution: with TaCl 5 and ZrOCl 2 ?8H 2 O is the precursor, the mixture of acetylacetone (chelating agent) and methanol is the first solvent, and the molar ratio of TaCl 5 : ZrOCl 2 ?8H 2O: acetylacetone: methanol = 1:1:6:72, 3.58g TaCl 5 and 3.22 g ZrOCl 2 ?8H 2 O was slowly added to the mixed solution of 6.0g acetylacetone and 23.04g methanol, and kept stirring to obtain a precursor solution containing tantalum and zirconium; with phenolic resin as the carbon source precursor, and the mixed solution...

Embodiment 2

[0045] A Ta-Zr-C ternary ceramic of the present invention is a Ta-Zr-C continuous single-phase solid solution ceramic powder in which Zr atoms are solid-dissolved in TaC, and the density is 11.32g / cm 3 , The particle size of the ceramic powder is less than 500nm, and the average particle size is 216.7nm.

[0046] A kind of preparation method of the Ta-Zr-C ternary ceramic of above-mentioned present embodiment, comprises the following steps:

[0047] (1) Preparation of precursor solution: with TaCl 5 and Zr(NO 3 ) 4 ?5H 2 O is the precursor containing tantalum and zirconium, and the mixture of ethylene glycol (chelating agent) and ethanol is used as the first solvent, and the molar ratio of TaCl 5 : Zr(NO 3 ) 4 ?5H 2 O: ethylene glycol: ethanol = 2: 1: 7.5: 80, 3.58g TaCl 5 and 2.15g Zr(NO 3 ) 4 ?5H 2 O is slowly added in the mixed solution of 2.325g ethylene glycol and 18.4g ethanol, constantly stirs, obtains the precursor solution containing tantalum and zirconium;...

Embodiment 3

[0054] A Ta-Zr-C ternary ceramic of the present invention is a Ta-Zr-C continuous single-phase solid solution ceramic powder in which Zr atoms are dissolved in TaC, and the density is 12.47g / cm 3 , The particle size of the ceramic powder is less than 500nm, and the average particle size is 220.8nm.

[0055] A kind of preparation method of the Ta-Zr-C ternary ceramic of above-mentioned present embodiment, comprises the following steps:

[0056] (1) Preparation of precursor solution: with TaCl 5 and ZrCl 4 It is a precursor containing tantalum and zirconium, and the mixture of acetylacetone (chelating agent) and ethanol is used as the first solvent, and the molar ratio of TaCl 5 : ZrCl 4 : acetylacetone: ethanol = 4: 1: 10: 90, 3.58g TaCl 5 and 0.58gZrCl 4 Slowly add in the mixed solution of 2.50g acetylacetone and 10.35g ethanol, stir constantly, obtain the precursor solution containing tantalum and zirconium; With phenolic resin as the carbon source precursor, with the mi...

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Abstract

The invention discloses a Ta-Zr-C ternary ceramic and a preparation method thereof. The Ta-Zr-C ternary ceramic provided by the invention is of Ta-Zr-C continuous single-phase solid solution ceramic powder. The preparation method comprising the following steps of (1) proportioning precursor solution; (2) preparing sol; (3) aging; (4) drying; and (5) calcining the dried material at a high temperature and in steps. The Ta-Zr-C ternary ceramic provided by the invention has the characteristics that the grain size is small, the components are uniform, the purity is high and the like, and the preparation method provided by the invention has the excellent advantages that the requirement of the process equipment is simple, the temperature requirement is low, the cost is low and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a Ta-Zr-C ternary ceramic and a preparation method thereof. Background technique [0002] Hypersonic vehicles are at the forefront of high-tech development in the aerospace field today. When the aircraft accelerates to hypersonic speed in a very short time, its hot end will generate a high temperature exceeding 3000°C, so there are extremely high requirements for the temperature resistance and ablation resistance of the material. However, existing materials have been difficult to meet the aforementioned application requirements. In this context, the development of new materials with high temperature resistance, erosion resistance, ablation resistance and long-term physical and chemical stability has become a research hotspot in the field of materials at home and abroad. [0003] Ultra-high temperature resistant ceramics (UHTC), especially carbides and bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
Inventor 王松蒋进明李伟张健陈朝辉
Owner NAT UNIV OF DEFENSE TECH
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