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A kind of preparation method of isotropic ceramic nanowire preform

An isotropic and prefabricated technology, which is applied in the field of preparation of isotropic ceramic nanowire prefabricated bodies, can solve the problems of low yield and uneven distribution of nanophases, and achieve simple preparation steps, uniform structure and controllable size. Effect

Active Publication Date: 2021-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of preparation method of isotropic ceramic nanowire preform
  • A kind of preparation method of isotropic ceramic nanowire preform
  • A kind of preparation method of isotropic ceramic nanowire preform

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Experimental program
Comparison scheme
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 method for preparing an isotropic ceramic nanowire prefabricated body. The polymer precursor is loaded on activated carbon powder to form a mixture and pressed into a blank template, so that the polymer precursor on the template is cracked at a certain temperature. A large number of cross-overlapped nanowires are grown. The active carbon is then oxidized to remove, and an isotropic interconnected three-dimensional network structure ceramic nanowire prefabricated material is prepared. The nanowires in the isotropic ceramic nanowire prefabricated body prepared by the invention have pure composition, uniform structure, controllable size and adjustable volume fraction. The process steps are simple, the cycle is short, the cost is relatively low, and the process also has good stability and repeatability. At the same time, the ceramic nanowire prefabricated body has functions such as heat insulation, light weight, electricity, and optics, and is expected to meet the requirements of multifunctional integration and expand the application field of ceramic matrix composite materials.

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 Patents(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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