Preparation method of isotropic ceramic nanowire preform

An isotropic, prefabricated technology, applied in the direction of inorganic chemistry, carbon compounds, non-metallic elements, etc., can solve the problems of uneven distribution and low yield of nanophase, and achieve uniform structure, simple preparation process steps, and good thermal stability Effects on Sexuality and Chemical Stability

Active Publication Date: 2019-12-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the technical problems of low yield and uneven distribution of nanophases in ceramic nanowire preforms

Method used

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  • Preparation method of isotropic ceramic nanowire preform
  • Preparation method of isotropic ceramic nanowire preform
  • Preparation method of isotropic ceramic nanowire preform

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Experimental program
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Effect test

Embodiment 1

[0039] Step 1. Pretreatment of activated carbon: the present invention uses activated carbon powder as a template. Soak the activated carbon powder in acetone for 24 hours, then soak it in distilled water at 90°C for 30 minutes to remove impurities in the activated carbon powder. The activated carbon powder was then dried in a vacuum oven at a drying temperature of 100°C and a drying time of 12 hours;

[0040] Step 2. Preparation of the precursor solution: the polycarbosilane precursor and xylene were prepared into a precursor solution at a mass ratio of 1:5, and the magnetic stirring was used to continuously stir for 30 minutes at a speed of 200 rpm. Then, the catalyst nickelocene was mixed in a ratio of 5wt.%, and then magnetic stirring was used to continuously stir for 30min at a speed of 200r / min;

[0041] Step 3. Preparation of activated carbon-loaded precursor batch: Take an appropriate amount of activated carbon powder after impurity removal and mix it with the precurs...

Embodiment 2

[0047] Step 1. Pretreatment of activated carbon: the present invention uses activated carbon powder as a template. Soak the activated carbon powder in acetone for 24 hours, then soak it in distilled water at 90°C for 30 minutes to remove impurities in the activated carbon powder. The activated carbon powder was then dried in a vacuum oven at a drying temperature of 100°C and a drying time of 12 hours;

[0048] Step 2. Preparation of the precursor solution: the polysilazane precursor and cyclohexane were prepared at a mass ratio of 1:5 to prepare a precursor solution, and the magnetic stirring was used to continuously stir at 200 rpm for 30 min. Then the catalyst ferrocene was mixed in a ratio of 5wt.%, followed by magnetic stirring at a speed of 200r / min for 30min;

[0049] Step 3. Preparation of activated carbon-loaded precursor batch: Take an appropriate amount of activated carbon powder after impurity removal and mix it with the precursor solution prepared in step 2 to mak...

Embodiment 3

[0055] Step 1. Pretreatment of activated carbon: the present invention uses activated carbon powder as a template. After soaking the activated carbon powder in acetone for 24 hours, soak it in distilled water at 70°C for 1 hour to remove impurities in the activated carbon powder. The activated carbon powder was then dried in a vacuum oven at a drying temperature of 100°C and a drying time of 24 hours;

[0056] Step 2. Preparation of the precursor solution: the polycarbosilane precursor and cyclohexane were prepared into a precursor solution at a mass ratio of 1:10, and the magnetic stirring was continuously stirred at 200 rpm for 30 min. Then the catalyst ferrocene was mixed in a ratio of 5wt.%, followed by magnetic stirring at a speed of 200r / min for 30min;

[0057] Step 3. Preparation of activated carbon-loaded precursor batch: Take an appropriate amount of activated carbon powder after impurity removal and mix it with the precursor solution prepared in step 2 to make an ac...

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Abstract

The invention relates to a preparation method of an isotropic ceramic nanowire preform, which comprises the following steps: loading a polymer precursor on activated carbon powder to form a mixture, pressing the mixture into a green body template; cracking the polymer precursor on the template at a certain temperature to grow a large number of nanowires which are crossed and lapped with one another; then performing oxidation to remove the activated carbon to prepare the isotropic ceramic nanowire preform material with the interconnected three-dimensional network structure. The nanowires in theisotropic ceramic nanowire preform prepared by the method are pure in component, uniform in structure, controllable in size and adjustable in volume fraction. The method has the advantages of simpleprocess steps, short period, relatively low cost, good stability and good repeatability. Meanwhile, the ceramic nanowire preform has the functions of heat insulation, light weight, electricity, opticsand the like, requirement for multifunctional integration is expected to be met, and the application field of ceramic matrix composite materials is expanded.

Description

technical field [0001] The invention belongs to the technical field of preparation of new materials, and relates to a preparation method of an isotropic ceramic nanowire preform. Background technique [0002] Ceramic matrix composites (such as silicon-based silicon carbide, silicon nitride ceramic matrix composites and zirconium carbide, zirconium boride ultra-high temperature ceramic matrix composites, etc.) have high strength, high modulus, good toughness, low density, High temperature resistance (silicon-based ceramic matrix composites can withstand 1450°C, ultra-high temperature ceramic matrix composites can withstand 2000°C), wear resistance and corrosion resistance, etc., are widely used in various industries such as aerospace, nuclear, and braking systems field. Ceramic matrix composites are mainly composed of reinforcement and matrix. The reinforcement has the characteristics of high strength and high modulus, and can strengthen and toughen the ceramic matrix. Rei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
CPCC04B35/565C04B35/62281C04B2235/6562C04B2235/6567C04B2235/77C04B2235/6581C04B2235/94C04B2235/95C04B35/80C04B2235/483C04B2235/5264C04B2235/422C04B35/6267C04B35/62295C04B2235/48C04B35/62272C04B35/62675C04B35/6229C04B35/62277C04B2235/5244C04B2235/5252C04B2235/6583
Inventor 成来飞叶昉郭楚楚张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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