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Hybridization liquid precursor, preparing method and method for preparing ZrC-SiC superhigh temperature ceramics and composite materials of ZrC-SiC superhigh temperature ceramics through hybridization liquid precursor

A technology of ultra-high temperature ceramics and composite materials, applied in the field of ultra-high temperature ceramics, can solve the problems of human body and environmental damage, low ceramic yield, precursor viscosity change, etc., and achieves good impregnation, low impregnation temperature, and good oxidation resistance. Effect

Active Publication Date: 2014-11-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the ceramic yield is low, the volatilization of organic matter during the impregnation process causes the viscosity of the precursor to change, and the organic solvent has certain damage to the human body and the environment.

Method used

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  • Hybridization liquid precursor, preparing method and method for preparing ZrC-SiC superhigh temperature ceramics and composite materials of ZrC-SiC superhigh temperature ceramics through hybridization liquid precursor
  • Hybridization liquid precursor, preparing method and method for preparing ZrC-SiC superhigh temperature ceramics and composite materials of ZrC-SiC superhigh temperature ceramics through hybridization liquid precursor
  • Hybridization liquid precursor, preparing method and method for preparing ZrC-SiC superhigh temperature ceramics and composite materials of ZrC-SiC superhigh temperature ceramics through hybridization liquid precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The carbon-rich liquid polycarbosilane (LPCS) and solid zirconium acetylacetonate (PZC) precursors were mixed uniformly at a mass ratio of 1:1, and the hybridization treatment was performed at a temperature of 30°C and a magnetic stirring condition of 200 rpm for 3 hours. , the molecular structure of the obtained hybrid liquid LPCS-PZC ceramic precursor is as follows:

[0047]

[0048] Where: R=CH 3 or H.

[0049] The structural formula of the carbon-rich vinyl substituted liquid polycarbosilane precursor LPCS is as follows:

[0050]

[0051] Where: R=CH 3 or H;

[0052] The structural formula of the solid zirconium acetylacetonate precursor PZC is as follows:

[0053]

[0054] Where: R=CH 3 or H.

[0055] Such as figure 1 Shown is the infrared spectrogram of the hybrid liquid LPCS-PZC ceramic precursor obtained by the present invention using carbon-rich liquid polycarbosilane (LPCS), solid zirconium acetylacetonate precursor (PZC) and hybrid treatment; ...

Embodiment 2

[0058] The carbon-rich liquid polycarbosilane (LPCS) and solid zirconium acetylacetonate (PZC) precursors were mass-produced at 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4 Mix evenly, and perform hybridization treatment for 5 hours under the condition of 25° C. and 250 rpm magnetic stirring to obtain a hybrid liquid LPCS-PZC ceramic precursor. The obtained hybrid liquid LPCS-PZC ceramic precursor has good fluidity and is suitable for preparing fiber-reinforced ZrC-SiC ultra-high temperature ceramic matrix composites by impregnation-curing-cracking process.

[0059] Such as figure 2 Shown is the relationship between the viscosity of the hybrid liquid LPCS-PZC ceramic precursor of the present invention and the ratio of liquid polycarbosilane (LPCS) and solid zirconium acetylacetonate (PZC); the illustration shows the dissolution of different contents of solid zirconium acetylacetonate (PZC) into Minimum time required in liquid polycarbosilane (LPCS). Depend on figure 2 It can b...

Embodiment 3

[0061] Mix the carbon-rich liquid polycarbosilane (LPCS) and solid zirconium acetylacetonate (PZC) precursors at a mass ratio of 1:1, 1:2, 1:3, and 1:4, and mix them uniformly at a temperature of 35°C and 180 rpm The hybridization treatment was carried out under magnetic stirring conditions for 8 hours to obtain a hybrid liquid LPCS-PZC ceramic precursor. The fluidity of the hybrid liquid LPCS-PZC ceramic precursor is good. The hybrid liquid LPCS-PZC ceramic precursor was cured at 195°C for 4 hours, and the thermogravimetric analysis showed that the ceramic yield of the hybrid liquid LPCS-PZC ceramic precursor was 77% when the ratio was 1:1, and 1:2 75% at 1:3, 74% at 1:4, and 69% at 1:4. Such as image 3 Shown is the cured ceramic conversion rate of the hybrid liquid LPCS-PZC ceramic precursors prepared in the present invention with different ratios of liquid polycarbosilane (LPCS) and solid zirconium acetylacetonate (PZC).

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Abstract

The invention relates to hybridization liquid precursor, a preparing method and a method for preparing ZrC-SiC superhigh temperature ceramics and composite materials of the ZrC-SiC superhigh temperature ceramics through the hybridization liquid precursor. Solid PZC precursor and carbon-rich vinyl adopted to replace liquid polycarbosilane (LPCS) precursor serve as raw materials for the first time and are processed in a hybridization mode to synthesize the brand new hybridization liquid precursor which is low in viscosity, adjustable in component, low in solidifying temperature, good in dipping performance, free of toxicity, harmless and high in productivity, organic solvent does not need to be added to the hybridization liquid precursor, the hybridization liquid precursor can be used for preparing the ZrC-SiC superhigh temperature ceramics and the composite materials of the ZrC-SiC superhigh temperature ceramics, and according to the thermogravimetric analysis, the ceramic productivity of the hybridization liquid LPCS-PZC ceramic precursor is more than 69 percent. The percent conversion of the ZrC-SiC superhigh temperature ceramics or the percent conversion of the fiber-reinforced ZrC-SiC superhigh temperature ceramic composite material ceramic is high, the technology is simple, and the high-temperature oxidation resistance of the obtained materials is good.

Description

technical field [0001] The invention relates to a hybrid liquid precursor, a preparation method and a method for preparing ZrC-SiC ultra-high temperature ceramics and composite materials thereof by using the precursor, belonging to the field of ultra-high temperature ceramics. Background technique [0002] Transition metal borides and carbides ultra-high temperature ceramics and their composites are important thermal protection materials for hypersonic vehicles and scramjet engines, as well as key materials for solar energy absorption and nuclear reactor applications. Due to the advantages of high melting point, high thermal conductivity, no phase transition from room temperature to melting point, and good thermochemical stability, ZrC has become one of the most promising ultra-high temperature ceramics in the aerospace and nuclear industries. However, the oxidation resistance of ZrC ceramics at high and ultra-high temperatures is not ideal, and it is necessary to introduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C04B35/56C04B35/565C04B35/80
Inventor 周延春王晓飞孙新胡继东向会敏冯志海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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