Precursor solution of carbide ceramic, carbide ceramic and preparation thereof

A technology of precursors and carbides, which is applied in the preparation process of ultra-high temperature carbide ceramics and the field of precursor solution of ultra-high temperature carbide ceramics, which can solve the problems of low yield of cracking and conversion ceramics, low concentration of precursors, and low yield of ceramics and other problems, to achieve the effect of shortening the impregnation-cracking cycle, simplifying the preparation process, and improving material properties

Inactive Publication Date: 2009-01-21
NAT UNIV OF DEFENSE TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] Xianghua proposed the use of TaCl in his master's thesis "Preparation of C / C-TaC Composite Materials by Chemical Liquid Phase Infiltration and Its Ablation Properties" (Master's Thesis of Northwestern Polytechnical University, 2006) 5 +HF+furan resin (ethanol as solvent) is used as TaC ceramic precursor to prepare C / C-TaC composite materials, but this precursor also has the disadvantages of low solute concentration, poor stability, and low ceramic yield.
[0007] Therefore, the ultra-high temperature carbide ceramic precursors used in the existing precursor impregnation-cracking process have disadvantages such as low precursor concentration in the solution, low yield of cracking conversion ceramics, and difficult crosslinking, which further leads to the development of high-temperature carbide ceramics. The process in the preparation process is too long and the cost is too high

Method used

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  • Precursor solution of carbide ceramic, carbide ceramic and preparation thereof
  • Precursor solution of carbide ceramic, carbide ceramic and preparation thereof
  • Precursor solution of carbide ceramic, carbide ceramic and preparation thereof

Examples

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Embodiment 1

[0024] A zirconium carbide (ZrC) ceramic precursor solution of the present invention, the solution uses zirconium tetra-n-butoxide as a solute, divinylbenzene as a solvent, and the solute and solvent are mixed in a molar ratio of 1:0.8.

[0025] A zirconium carbide ceramic prepared by using the zirconium carbide ceramic precursor solution prepared above, the specific preparation process includes the following steps: after sealing the zirconium carbide ceramic precursor solution prepared above, stirring for 2 hours; The zirconium ceramic precursor solution was placed in a drying oven, and the temperature was rapidly raised to 180 °C at a heating rate of 10 °C / min, and kept for 4 hours to allow crosslinking; the low-temperature crosslinked zirconium carbide ceramic precursor was placed in a cracking furnace , under the protection of argon, the temperature was rapidly raised to 1600°C, and the temperature was kept for 0.5h for high-temperature cracking, and zirconium carbide ceram...

Embodiment 2

[0028] A titanium carbide (TiC) ceramic precursor solution of the present invention, the solution uses titanium ethoxide as a solute, divinylbenzene as a solvent, and the solute and solvent are mixed in a molar ratio of 1:0.6.

[0029] A titanium carbide ceramic prepared by using the titanium carbide ceramic precursor solution prepared above, the specific preparation process includes the following steps: after sealing the titanium carbide ceramic precursor solution prepared above, stirring for 0.5h; The titanium carbide ceramic precursor solution was placed in a drying oven, and the temperature was rapidly raised to 220 °C at a heating rate of 5 °C / min, and kept for 2 hours for cross-linking; the low-temperature cross-linked titanium carbide ceramic precursor was placed in a cracking furnace In the process, the temperature was rapidly raised to 1200 °C under vacuum conditions, and the temperature was kept for 1.5 hours for high-temperature pyrolysis, and titanium carbide cerami...

Embodiment 3

[0032]A kind of precursor solution of zirconium carbide (ZrC) ceramics and titanium carbide (TiC) ceramics mixture of the present invention, this solution is to be solute with tetra-n-butoxy zirconium and tetra-n-butoxy titanium, with diethynylbenzene as The solvent, the solute and the solvent are mixed in a molar ratio of tetra-n-butoxy zirconium: tetra-n-butoxy titanium: diethynylbenzene in a molar ratio of 1:0.8:1.3.

[0033] A mixture of zirconium carbide ceramics and titanium carbide ceramics prepared from the precursor solution of zirconium carbide ceramics and titanium carbide ceramics prepared above. The specific preparation process includes the following steps: combining the zirconium carbide ceramics prepared above After the precursor solution of the titanium-ceramic mixture was sealed, it was stirred for 2 hours; the uniformly stirred precursor solution of the zirconium carbide ceramic and titanium carbide ceramic mixture was placed in a drying oven, and the temperat...

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Abstract

The invention discloses precursor solution for carbide ceramics. The precursor solution uses an alkoxy compound of more than one refractory metal as solute, and uses divinylbenzene, vinyl group acetylenyl benzene or diacetylene-benzene as solvent, and the molar ratio of the solute to the solvent is 1 to between 0.2 and 2. The invention also discloses carbide ceramics and a preparation method thereof. The method comprises the following preparation steps: the precursor solution of the invention is evenly mixed and heated to between 150 and 300 DEG C, and then is insulated for 0.5 to 4 hours; the precursor after low temperature crosslinking treatment is heated to between 1, 200 and 1, 800 DEG C in an inert atmosphere or under a vacuum condition, and then is insulated for 0.5 to 2 hours for high temperature pyrolysis; and the carbide ceramics is obtained after temperature reduction. The precursor solution has the advantages of low viscosity, good stability, simple preparation process, and so on. The method for preparing the carbide ceramics has the advantages of high impregnation efficiency, simple crosslinking process, high ceramics yield, and so on.

Description

technical field [0001] The invention relates to a precursor solution of ceramics and a process for preparing ceramics from the precursor solution, in particular to a precursor solution of ultra-high temperature carbide ceramics and a preparation process for ultra-high temperature carbide ceramics. Background technique [0002] The improvement of the flight speed of aerospace vehicles puts forward higher and higher requirements for materials. When the aircraft re-enters, the nose cone, wing leading edge and other parts of the aircraft will be subjected to a severe thermal environment of large heat flow (tens of megawatts to hundreds of megawatts), instantaneous high temperature and ultra-high temperature (2000-3000 °C). Due to the large amount of ablation and asynchronous ablation of traditional ablation heat-resistant materials, the external dimensions of the aircraft change greatly, which seriously affects the flight attitude and flight trajectory. In addition, the throat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/63
Inventor 胡海峰张玉娣赵丹张长瑞王其坤杨国威
Owner NAT UNIV OF DEFENSE TECH
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