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Tantalum carbide ceramic precursor synthesis method and obtained tantalum carbide ceramics

A technology of a ceramic precursor and a synthesis method, applied in the field of tantalum carbide ceramics, can solve the problems of carbon fiber surface damage, affecting the mechanical properties and high temperature resistance of composite materials, and achieve the effects of improving high temperature resistance, low cost and improving mechanical properties.

Active Publication Date: 2020-01-10
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 synthesis method of a tantalum carbide ceramic precursor and the resulting tantalum carbide ceramics. The present invention mainly solves the problem that when TaC is synthesized by the existing precursor conversion method, the high-temperature carbothermal reduction reaction will cause a large number of fine damages on the surface of carbon fibers; The raw materials used in the preparation of precursors are only mixed at the physical level without chemical reactions, which affects the mechanical properties and high temperature resistance of the composite materials obtained.

Method used

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  • Tantalum carbide ceramic precursor synthesis method and obtained tantalum carbide ceramics
  • Tantalum carbide ceramic precursor synthesis method and obtained tantalum carbide ceramics
  • Tantalum carbide ceramic precursor synthesis method and obtained tantalum carbide ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a high-purity argon environment, 9.0g (0.025mol) of tantalum source compound (TaCl 5 ) into the three-necked flask. Add 100mL triethylamine and 3.0g (0.05mol) ethylenediamine, and stir well, react at room temperature for 4h. The temperature was raised to 320° C., kept for 1 hour, and cooled to obtain a black, brittle tantalum carbide precursor with a synthesis yield of 50.2%.

[0029] Result analysis: measure the thermogravimetric curve, nuclear magnetic resonance spectrogram, infrared spectrogram, X-ray diffraction spectrogram of embodiment 1 gained product respectively by existing method, gained result is listed in Figure 1~4 middle.

[0030] figure 1 It is the infrared spectrogram (FT IR) of the tantalum carbide precursor obtained in Example 1. Among them, the corresponding group of the main absorption peak can be attributed to: 3429cm -1 、3383cm -1 、3164cm -1 (ν(C-H(-CH 2 )) and ν(N-H)), 2955cm -1 、2858cm -1 (ν(C-H)); 1609cm -1 (δ(N-H)), 1452cm -1 (δ...

Embodiment 2

[0035] In a high-purity argon environment, 14.5g (0.025mol) of tantalum source compound (TaBr 5 ) into the three-necked flask. Add 100mL triethylamine and 16.0g (0.1mol) N,N'-bis(2-aminoethyl)-1,3-propanediamine (C 7 h 20 N 4), and fully stirred, reacted at room temperature for 6h. Raise the temperature to 300°C, hold the temperature for 2 hours, and cool to obtain a black, brittle tantalum carbide precursor. The synthesis yield is 46.8%, and the ceramic yield is about 66% at 1000°C.

Embodiment 3

[0037] The difference with Example 1 is: the molar ratio of Ta-X bond and N-H bond is 1:5, and the tantalum source compound is TaI 5 , the polyamine compound is propylene diamine; stirring and reacting for 8 hours, then raising the temperature to 350° C., keeping the temperature for 4 hours, and cooling to room temperature to obtain a tantalum carbide ceramic precursor.

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Abstract

The invention provides a synthetic method of tantalum carbide ceramic precursor and tantalum carbide ceramic; the synthetic method includes: allowing tantalum source compound TaX5 (X is Cl, Br or I) and a poly-amino compound at least containing two N-N bonds to pre-action at room temperature prior to heating for reaction so as to obtain the tantalum carbide ceramic precursor. The synthetic methodhas low cost and simple process, and the synthesized tantalum carbide ceramic precursor is applicable to the preparation of tantalum carbide ceramic materials.

Description

technical field [0001] The invention relates to the technical field of tantalum carbide ceramics, in particular to a method for synthesizing a precursor of tantalum carbide ceramics and the obtained tantalum carbide ceramics. Background technique [0002] The rapid development of aerospace technology has put forward an urgent demand for ultra-high temperature materials. Ultra-high temperature material refers to a special material that can maintain stable physical and chemical properties in a high-temperature (above 2000°C) environment and a high-temperature reaction atmosphere. As a member of ultra-high temperature materials, tantalum carbide (TaC) ceramics has a very high melting point (3880 ° C), which is higher than most metal carbides, and has high mechanical strength, high hardness, excellent thermodynamics and chemical stability. With excellent high temperature resistance, oxidation resistance and ablation resistance, it is an ultra-high temperature ceramic material w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5607C04B35/622
Inventor 简科王军王浩邵长伟王小宙苟燕子谢征芳
Owner NAT UNIV OF DEFENSE TECH
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